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46 files changed, 6625 insertions, 0 deletions

diff --git a/node_modules/csso/lib/cli.js b/node_modules/csso/lib/cli.js
new file mode 100644
index 00000000..83846875
--- /dev/null
+++ b/node_modules/csso/lib/cli.js
@@ -0,0 +1,338 @@
+var fs = require('fs');
+var path = require('path');
+var cli = require('clap');
+var SourceMapConsumer = require('source-map').SourceMapConsumer;
+var csso = require('./index.js');
+
+function readFromStream(stream, minify) {
+    var buffer = [];
+
+    // FIXME: don't chain until node.js 0.10 drop, since setEncoding isn't chainable in 0.10
+    stream.setEncoding('utf8');
+    stream
+        .on('data', function(chunk) {
+            buffer.push(chunk);
+        })
+        .on('end', function() {
+            minify(buffer.join(''));
+        });
+}
+
+function showStat(filename, source, result, inputMap, map, time, mem) {
+    function fmt(size) {
+        return String(size).split('').reverse().reduce(function(size, digit, idx) {
+            if (idx && idx % 3 === 0) {
+                size = ' ' + size;
+            }
+            return digit + size;
+        }, '');
+    }
+
+    map = map || 0;
+    result -= map;
+
+    console.error('Source:    ', filename === '<stdin>' ? filename : path.relative(process.cwd(), filename));
+    if (inputMap) {
+        console.error('Map source:', inputMap);
+    }
+    console.error('Original:  ', fmt(source), 'bytes');
+    console.error('Compressed:', fmt(result), 'bytes', '(' + (100 * result / source).toFixed(2) + '%)');
+    console.error('Saving:    ', fmt(source - result), 'bytes', '(' + (100 * (source - result) / source).toFixed(2) + '%)');
+    if (map) {
+        console.error('Source map:', fmt(map), 'bytes', '(' + (100 * map / (result + map)).toFixed(2) + '% of total)');
+        console.error('Total:     ', fmt(map + result), 'bytes');
+    }
+    console.error('Time:      ', time, 'ms');
+    console.error('Memory:    ', (mem / (1024 * 1024)).toFixed(3), 'MB');
+}
+
+function showParseError(source, filename, details, message) {
+    function processLines(start, end) {
+        return lines.slice(start, end).map(function(line, idx) {
+            var num = String(start + idx + 1);
+
+            while (num.length < maxNumLength) {
+                num = ' ' + num;
+            }
+
+            return num + ' |' + line;
+        }).join('\n');
+    }
+
+    var lines = source.split(/\n|\r\n?|\f/);
+    var column = details.column;
+    var line = details.line;
+    var startLine = Math.max(1, line - 2);
+    var endLine = Math.min(line + 2, lines.length + 1);
+    var maxNumLength = Math.max(4, String(endLine).length) + 1;
+
+    console.error('\nParse error ' + filename + ': ' + message);
+    console.error(processLines(startLine - 1, line));
+    console.error(new Array(column + maxNumLength + 2).join('-') + '^');
+    console.error(processLines(line, endLine));
+    console.error();
+}
+
+function debugLevel(level) {
+    // level is undefined when no param -> 1
+    return isNaN(level) ? 1 : Math.max(Number(level), 0);
+}
+
+function resolveSourceMap(source, inputMap, map, inputFile, outputFile) {
+    var inputMapContent = null;
+    var inputMapFile = null;
+    var outputMapFile = null;
+
+    switch (map) {
+        case 'none':
+            // don't generate source map
+            map = false;
+            inputMap = 'none';
+            break;
+
+        case 'inline':
+            // nothing to do
+            break;
+
+        case 'file':
+            if (!outputFile) {
+                console.error('Output filename should be specified when `--map file` is used');
+                process.exit(2);
+            }
+
+            outputMapFile = outputFile + '.map';
+            break;
+
+        default:
+            // process filename
+            if (map) {
+                // check path is reachable
+                if (!fs.existsSync(path.dirname(map))) {
+                    console.error('Directory for map file should exists:', path.dirname(path.resolve(map)));
+                    process.exit(2);
+                }
+
+                // resolve to absolute path
+                outputMapFile = path.resolve(process.cwd(), map);
+            }
+    }
+
+    switch (inputMap) {
+        case 'none':
+            // nothing to do
+            break;
+
+        case 'auto':
+            if (map) {
+                // try fetch source map from source
+                var inputMapComment = source.match(/\/\*# sourceMappingURL=(\S+)\s*\*\/\s*$/);
+
+                if (inputFile === '<stdin>') {
+                    inputFile = false;
+                }
+
+                if (inputMapComment) {
+                    // if comment found – value is filename or base64-encoded source map
+                    inputMapComment = inputMapComment[1];
+
+                    if (inputMapComment.substr(0, 5) === 'data:') {
+                        // decode source map content from comment
+                        inputMapContent = new Buffer(inputMapComment.substr(inputMapComment.indexOf('base64,') + 7), 'base64').toString();
+                    } else {
+                        // value is filename – resolve it as absolute path
+                        if (inputFile) {
+                            inputMapFile = path.resolve(path.dirname(inputFile), inputMapComment);
+                        }
+                    }
+                } else {
+                    // comment doesn't found - look up file with `.map` extension nearby input file
+                    if (inputFile && fs.existsSync(inputFile + '.map')) {
+                        inputMapFile = inputFile + '.map';
+                    }
+                }
+
+            }
+            break;
+
+        default:
+            if (inputMap) {
+                inputMapFile = inputMap;
+            }
+    }
+
+    // source map placed in external file
+    if (inputMapFile) {
+        inputMapContent = fs.readFileSync(inputMapFile, 'utf8');
+    }
+
+    return {
+        input: inputMapContent,
+        inputFile: inputMapFile || (inputMapContent ? '<inline>' : false),
+        output: map,
+        outputFile: outputMapFile
+    };
+}
+
+function processCommentsOption(value) {
+    switch (value) {
+        case 'exclamation':
+        case 'first-exclamation':
+        case 'none':
+            return value;
+    }
+
+    console.error('Wrong value for `comments` option: %s', value);
+    process.exit(2);
+}
+
+var command = cli.create('csso', '[input] [output]')
+    .version(require('../package.json').version)
+    .option('-i, --input <filename>', 'Input file')
+    .option('-o, --output <filename>', 'Output file (result outputs to stdout if not set)')
+    .option('-m, --map <destination>', 'Generate source map: none (default), inline, file or <filename>', 'none')
+    .option('-u, --usage <filenane>', 'Usage data file')
+    .option('--input-map <source>', 'Input source map: none, auto (default) or <filename>', 'auto')
+    .option('--restructure-off', 'Turns structure minimization off')
+    .option('--comments <value>', 'Comments to keep: exclamation (default), first-exclamation or none', 'exclamation')
+    .option('--stat', 'Output statistics in stderr')
+    .option('--debug [level]', 'Output intermediate state of CSS during compression', debugLevel, 0)
+    .action(function(args) {
+        var options = this.values;
+        var inputFile = options.input || args[0];
+        var outputFile = options.output || args[1];
+        var usageFile = options.usage;
+        var usageData = false;
+        var map = options.map;
+        var inputMap = options.inputMap;
+        var structureOptimisationOff = options.restructureOff;
+        var comments = processCommentsOption(options.comments);
+        var debug = options.debug;
+        var statistics = options.stat;
+        var inputStream;
+
+        if (process.stdin.isTTY && !inputFile && !outputFile) {
+            this.showHelp();
+            return;
+        }
+
+        if (!inputFile) {
+            inputFile = '<stdin>';
+            inputStream = process.stdin;
+        } else {
+            inputFile = path.resolve(process.cwd(), inputFile);
+            inputStream = fs.createReadStream(inputFile);
+        }
+
+        if (outputFile) {
+            outputFile = path.resolve(process.cwd(), outputFile);
+        }
+
+        if (usageFile) {
+            if (!fs.existsSync(usageFile)) {
+                console.error('Usage data file doesn\'t found (%s)', usageFile);
+                process.exit(2);
+            }
+
+            usageData = fs.readFileSync(usageFile, 'utf-8');
+
+            try {
+                usageData = JSON.parse(usageData);
+            } catch (e) {
+                console.error('Usage data parse error (%s)', usageFile);
+                process.exit(2);
+            }
+        }
+
+        readFromStream(inputStream, function(source) {
+            var time = process.hrtime();
+            var mem = process.memoryUsage().heapUsed;
+            var sourceMap = resolveSourceMap(source, inputMap, map, inputFile, outputFile);
+            var sourceMapAnnotation = '';
+            var result;
+
+            // main action
+            try {
+                result = csso.minify(source, {
+                    filename: inputFile,
+                    sourceMap: sourceMap.output,
+                    usage: usageData,
+                    restructure: !structureOptimisationOff,
+                    comments: comments,
+                    debug: debug
+                });
+
+                // for backward capability minify returns a string
+                if (typeof result === 'string') {
+                    result = {
+                        css: result,
+                        map: null
+                    };
+                }
+            } catch (e) {
+                if (e.parseError) {
+                    showParseError(source, inputFile, e.parseError, e.message);
+                    if (!debug) {
+                        process.exit(2);
+                    }
+                }
+
+                throw e;
+            }
+
+            if (sourceMap.output && result.map) {
+                // apply input map
+                if (sourceMap.input) {
+                    result.map.applySourceMap(
+                        new SourceMapConsumer(sourceMap.input),
+                        inputFile
+                    );
+                }
+
+                // add source map to result
+                if (sourceMap.outputFile) {
+                    // write source map to file
+                    fs.writeFileSync(sourceMap.outputFile, result.map.toString(), 'utf-8');
+                    sourceMapAnnotation = '\n' +
+                        '/*# sourceMappingURL=' +
+                        path.relative(outputFile ? path.dirname(outputFile) : process.cwd(), sourceMap.outputFile) +
+                        ' */';
+                } else {
+                    // inline source map
+                    sourceMapAnnotation = '\n' +
+                        '/*# sourceMappingURL=data:application/json;base64,' +
+                        new Buffer(result.map.toString()).toString('base64') +
+                        ' */';
+                }
+
+                result.css += sourceMapAnnotation;
+            }
+
+            // output result
+            if (outputFile) {
+                fs.writeFileSync(outputFile, result.css, 'utf-8');
+            } else {
+                console.log(result.css);
+            }
+
+            // output statistics
+            if (statistics) {
+                var timeDiff = process.hrtime(time);
+                showStat(
+                    path.relative(process.cwd(), inputFile),
+                    source.length,
+                    result.css.length,
+                    sourceMap.inputFile,
+                    sourceMapAnnotation.length,
+                    parseInt(timeDiff[0] * 1e3 + timeDiff[1] / 1e6),
+                    process.memoryUsage().heapUsed - mem
+                );
+            }
+        });
+    });
+
+module.exports = {
+    run: command.run.bind(command),
+    isCliError: function(err) {
+        return err instanceof cli.Error;
+    }
+};
diff --git a/node_modules/csso/lib/compressor/clean/Atrule.js b/node_modules/csso/lib/compressor/clean/Atrule.js
new file mode 100644
index 00000000..d27db04b
--- /dev/null
+++ b/node_modules/csso/lib/compressor/clean/Atrule.js
@@ -0,0 +1,54 @@
+module.exports = function cleanAtrule(node, item, list) {
+    if (node.block) {
+        // otherwise removed at-rule don't prevent @import for removal
+        this.root.firstAtrulesAllowed = false;
+
+        if (node.block.type === 'Block' && node.block.declarations.isEmpty()) {
+            list.remove(item);
+            return;
+        }
+
+        if (node.block.type === 'StyleSheet' && node.block.rules.isEmpty()) {
+            list.remove(item);
+            return;
+        }
+    }
+
+    switch (node.name) {
+        case 'charset':
+            if (node.expression.sequence.isEmpty()) {
+                list.remove(item);
+                return;
+            }
+
+            // if there is any rule before @charset -> remove it
+            if (item.prev) {
+                list.remove(item);
+                return;
+            }
+
+            break;
+
+        case 'import':
+            if (!this.root.firstAtrulesAllowed) {
+                list.remove(item);
+                return;
+            }
+
+            // if there are some rules that not an @import or @charset before @import
+            // remove it
+            list.prevUntil(item.prev, function(rule) {
+                if (rule.type === 'Atrule') {
+                    if (rule.name === 'import' || rule.name === 'charset') {
+                        return;
+                    }
+                }
+
+                this.root.firstAtrulesAllowed = false;
+                list.remove(item);
+                return true;
+            }, this);
+
+            break;
+    }
+};
diff --git a/node_modules/csso/lib/compressor/clean/Comment.js b/node_modules/csso/lib/compressor/clean/Comment.js
new file mode 100644
index 00000000..aa80108d
--- /dev/null
+++ b/node_modules/csso/lib/compressor/clean/Comment.js
@@ -0,0 +1,3 @@
+module.exports = function cleanComment(data, item, list) {
+    list.remove(item);
+};
diff --git a/node_modules/csso/lib/compressor/clean/Declaration.js b/node_modules/csso/lib/compressor/clean/Declaration.js
new file mode 100644
index 00000000..05738d16
--- /dev/null
+++ b/node_modules/csso/lib/compressor/clean/Declaration.js
@@ -0,0 +1,5 @@
+module.exports = function cleanDeclartion(node, item, list) {
+    if (node.value.sequence.isEmpty()) {
+        list.remove(item);
+    }
+};
diff --git a/node_modules/csso/lib/compressor/clean/Identifier.js b/node_modules/csso/lib/compressor/clean/Identifier.js
new file mode 100644
index 00000000..20aec93e
--- /dev/null
+++ b/node_modules/csso/lib/compressor/clean/Identifier.js
@@ -0,0 +1,9 @@
+module.exports = function cleanIdentifier(node, item, list) {
+    // remove useless universal selector
+    if (this.selector !== null && node.name === '*') {
+        // remove when universal selector isn't last
+        if (item.next && item.next.data.type !== 'Combinator') {
+            list.remove(item);
+        }
+    }
+};
diff --git a/node_modules/csso/lib/compressor/clean/Ruleset.js b/node_modules/csso/lib/compressor/clean/Ruleset.js
new file mode 100644
index 00000000..4622b215
--- /dev/null
+++ b/node_modules/csso/lib/compressor/clean/Ruleset.js
@@ -0,0 +1,39 @@
+var hasOwnProperty = Object.prototype.hasOwnProperty;
+
+function cleanUnused(node, usageData) {
+    return node.selector.selectors.each(function(selector, item, list) {
+        var hasUnused = selector.sequence.some(function(node) {
+            switch (node.type) {
+                case 'Class':
+                    return usageData.classes && !hasOwnProperty.call(usageData.classes, node.name);
+
+                case 'Id':
+                    return usageData.ids && !hasOwnProperty.call(usageData.ids, node.name);
+
+                case 'Identifier':
+                    // ignore universal selector
+                    if (node.name !== '*') {
+                        // TODO: remove toLowerCase when type selectors will be normalized
+                        return usageData.tags && !hasOwnProperty.call(usageData.tags, node.name.toLowerCase());
+                    }
+
+                    break;
+            }
+        });
+
+        if (hasUnused) {
+            list.remove(item);
+        }
+    });
+}
+
+module.exports = function cleanRuleset(node, item, list, usageData) {
+    if (usageData) {
+        cleanUnused(node, usageData);
+    }
+
+    if (node.selector.selectors.isEmpty() ||
+        node.block.declarations.isEmpty()) {
+        list.remove(item);
+    }
+};
diff --git a/node_modules/csso/lib/compressor/clean/Space.js b/node_modules/csso/lib/compressor/clean/Space.js
new file mode 100644
index 00000000..3342c4ec
--- /dev/null
+++ b/node_modules/csso/lib/compressor/clean/Space.js
@@ -0,0 +1,16 @@
+function canCleanWhitespace(node) {
+    if (node.type !== 'Operator') {
+        return false;
+    }
+
+    return node.value !== '+' && node.value !== '-';
+}
+
+module.exports = function cleanWhitespace(node, item, list) {
+    var prev = item.prev && item.prev.data;
+    var next = item.next && item.next.data;
+
+    if (canCleanWhitespace(prev) || canCleanWhitespace(next)) {
+        list.remove(item);
+    }
+};
diff --git a/node_modules/csso/lib/compressor/clean/index.js b/node_modules/csso/lib/compressor/clean/index.js
new file mode 100644
index 00000000..750ee44e
--- /dev/null
+++ b/node_modules/csso/lib/compressor/clean/index.js
@@ -0,0 +1,17 @@
+var walk = require('../../utils/walk.js').all;
+var handlers = {
+    Space: require('./Space.js'),
+    Atrule: require('./Atrule.js'),
+    Ruleset: require('./Ruleset.js'),
+    Declaration: require('./Declaration.js'),
+    Identifier: require('./Identifier.js'),
+    Comment: require('./Comment.js')
+};
+
+module.exports = function(ast, usageData) {
+    walk(ast, function(node, item, list) {
+        if (handlers.hasOwnProperty(node.type)) {
+            handlers[node.type].call(this, node, item, list, usageData);
+        }
+    });
+};
diff --git a/node_modules/csso/lib/compressor/compress/Atrule.js b/node_modules/csso/lib/compressor/compress/Atrule.js
new file mode 100644
index 00000000..c5410ab9
--- /dev/null
+++ b/node_modules/csso/lib/compressor/compress/Atrule.js
@@ -0,0 +1,9 @@
+var resolveKeyword = require('../../utils/names.js').keyword;
+var compressKeyframes = require('./atrule/keyframes.js');
+
+module.exports = function(node) {
+    // compress @keyframe selectors
+    if (resolveKeyword(node.name).name === 'keyframes') {
+        compressKeyframes(node);
+    }
+};
diff --git a/node_modules/csso/lib/compressor/compress/Attribute.js b/node_modules/csso/lib/compressor/compress/Attribute.js
new file mode 100644
index 00000000..99cafdce
--- /dev/null
+++ b/node_modules/csso/lib/compressor/compress/Attribute.js
@@ -0,0 +1,33 @@
+// Can unquote attribute detection
+// Adopted implementation of Mathias Bynens
+// https://github.com/mathiasbynens/mothereff.in/blob/master/unquoted-attributes/eff.js
+var escapesRx = /\\([0-9A-Fa-f]{1,6})[ \t\n\f\r]?|\\./g;
+var blockUnquoteRx = /^(-?\d|--)|[\u0000-\u002c\u002e\u002f\u003A-\u0040\u005B-\u005E\u0060\u007B-\u009f]/;
+
+function canUnquote(value) {
+    if (value === '' || value === '-') {
+        return;
+    }
+
+    // Escapes are valid, so replace them with a valid non-empty string
+    value = value.replace(escapesRx, 'a');
+
+    return !blockUnquoteRx.test(value);
+}
+
+module.exports = function(node) {
+    var attrValue = node.value;
+
+    if (!attrValue || attrValue.type !== 'String') {
+        return;
+    }
+
+    var unquotedValue = attrValue.value.replace(/^(.)(.*)\1$/, '$2');
+    if (canUnquote(unquotedValue)) {
+        node.value = {
+            type: 'Identifier',
+            info: attrValue.info,
+            name: unquotedValue
+        };
+    }
+};
diff --git a/node_modules/csso/lib/compressor/compress/Dimension.js b/node_modules/csso/lib/compressor/compress/Dimension.js
new file mode 100644
index 00000000..e614ad08
--- /dev/null
+++ b/node_modules/csso/lib/compressor/compress/Dimension.js
@@ -0,0 +1,54 @@
+var packNumber = require('./Number.js').pack;
+var LENGTH_UNIT = {
+    // absolute length units
+    'px': true,
+    'mm': true,
+    'cm': true,
+    'in': true,
+    'pt': true,
+    'pc': true,
+
+    // relative length units
+    'em': true,
+    'ex': true,
+    'ch': true,
+    'rem': true,
+
+    // viewport-percentage lengths
+    'vh': true,
+    'vw': true,
+    'vmin': true,
+    'vmax': true,
+    'vm': true
+};
+
+module.exports = function compressDimension(node, item) {
+    var value = packNumber(node.value);
+
+    node.value = value;
+
+    if (value === '0' && this.declaration) {
+        var unit = node.unit.toLowerCase();
+
+        // only length values can be compressed
+        if (!LENGTH_UNIT.hasOwnProperty(unit)) {
+            return;
+        }
+
+        // issue #200: don't remove units in flex property as it could change value meaning
+        if (this.declaration.property.name === 'flex') {
+            return;
+        }
+
+        // issue #222: don't remove units inside calc
+        if (this['function'] && this['function'].name === 'calc') {
+            return;
+        }
+
+        item.data = {
+            type: 'Number',
+            info: node.info,
+            value: value
+        };
+    }
+};
diff --git a/node_modules/csso/lib/compressor/compress/Number.js b/node_modules/csso/lib/compressor/compress/Number.js
new file mode 100644
index 00000000..8e17e118
--- /dev/null
+++ b/node_modules/csso/lib/compressor/compress/Number.js
@@ -0,0 +1,22 @@
+function packNumber(value) {
+    // 100 -> '100'
+    // 00100 -> '100'
+    // +100 -> '100'
+    // -100 -> '-100'
+    // 0.123 -> '.123'
+    // 0.12300 -> '.123'
+    // 0.0 -> ''
+    // 0 -> ''
+    value = String(value).replace(/^(?:\+|(-))?0*(\d*)(?:\.0*|(\.\d*?)0*)?$/, '$1$2$3');
+
+    if (value.length === 0 || value === '-') {
+        value = '0';
+    }
+
+    return value;
+};
+
+module.exports = function(node) {
+    node.value = packNumber(node.value);
+};
+module.exports.pack = packNumber;
diff --git a/node_modules/csso/lib/compressor/compress/String.js b/node_modules/csso/lib/compressor/compress/String.js
new file mode 100644
index 00000000..01a20a2c
--- /dev/null
+++ b/node_modules/csso/lib/compressor/compress/String.js
@@ -0,0 +1,12 @@
+module.exports = function(node) {
+    var value = node.value;
+
+    // remove escaped \n, i.e.
+    // .a { content: "foo\
+    // bar"}
+    // ->
+    // .a { content: "foobar" }
+    value = value.replace(/\\\n/g, '');
+
+    node.value = value;
+};
diff --git a/node_modules/csso/lib/compressor/compress/Url.js b/node_modules/csso/lib/compressor/compress/Url.js
new file mode 100644
index 00000000..040a3590
--- /dev/null
+++ b/node_modules/csso/lib/compressor/compress/Url.js
@@ -0,0 +1,33 @@
+var UNICODE = '\\\\[0-9a-f]{1,6}(\\r\\n|[ \\n\\r\\t\\f])?';
+var ESCAPE = '(' + UNICODE + '|\\\\[^\\n\\r\\f0-9a-fA-F])';
+var NONPRINTABLE = '\u0000\u0008\u000b\u000e-\u001f\u007f';
+var SAFE_URL = new RegExp('^(' + ESCAPE + '|[^\"\'\\(\\)\\\\\\s' + NONPRINTABLE + '])*$', 'i');
+
+module.exports = function(node) {
+    var value = node.value;
+
+    if (value.type !== 'String') {
+        return;
+    }
+
+    var quote = value.value[0];
+    var url = value.value.substr(1, value.value.length - 2);
+
+    // convert `\\` to `/`
+    url = url.replace(/\\\\/g, '/');
+
+    // remove quotes when safe
+    // https://www.w3.org/TR/css-syntax-3/#url-unquoted-diagram
+    if (SAFE_URL.test(url)) {
+        node.value = {
+            type: 'Raw',
+            info: node.value.info,
+            value: url
+        };
+    } else {
+        // use double quotes if string has no double quotes
+        // otherwise use original quotes
+        // TODO: make better quote type selection
+        node.value.value = url.indexOf('"') === -1 ? '"' + url + '"' : quote + url + quote;
+    }
+};
diff --git a/node_modules/csso/lib/compressor/compress/Value.js b/node_modules/csso/lib/compressor/compress/Value.js
new file mode 100644
index 00000000..8196ba82
--- /dev/null
+++ b/node_modules/csso/lib/compressor/compress/Value.js
@@ -0,0 +1,18 @@
+var resolveName = require('../../utils/names.js').property;
+var handlers = {
+    'font': require('./property/font.js'),
+    'font-weight': require('./property/font-weight.js'),
+    'background': require('./property/background.js')
+};
+
+module.exports = function compressValue(node) {
+    if (!this.declaration) {
+        return;
+    }
+
+    var property = resolveName(this.declaration.property.name);
+
+    if (handlers.hasOwnProperty(property.name)) {
+        handlers[property.name](node);
+    }
+};
diff --git a/node_modules/csso/lib/compressor/compress/atrule/keyframes.js b/node_modules/csso/lib/compressor/compress/atrule/keyframes.js
new file mode 100644
index 00000000..74eff2c6
--- /dev/null
+++ b/node_modules/csso/lib/compressor/compress/atrule/keyframes.js
@@ -0,0 +1,21 @@
+module.exports = function(node) {
+    node.block.rules.each(function(ruleset) {
+        ruleset.selector.selectors.each(function(simpleselector) {
+            simpleselector.sequence.each(function(data, item) {
+                if (data.type === 'Percentage' && data.value === '100') {
+                    item.data = {
+                        type: 'Identifier',
+                        info: data.info,
+                        name: 'to'
+                    };
+                } else if (data.type === 'Identifier' && data.name === 'from') {
+                    item.data = {
+                        type: 'Percentage',
+                        info: data.info,
+                        value: '0'
+                    };
+                }
+            });
+        });
+    });
+};
diff --git a/node_modules/csso/lib/compressor/compress/color.js b/node_modules/csso/lib/compressor/compress/color.js
new file mode 100644
index 00000000..cf2a3236
--- /dev/null
+++ b/node_modules/csso/lib/compressor/compress/color.js
@@ -0,0 +1,489 @@
+var List = require('../../utils/list.js');
+var packNumber = require('./Number.js').pack;
+
+// http://www.w3.org/TR/css3-color/#svg-color
+var NAME_TO_HEX = {
+    'aliceblue': 'f0f8ff',
+    'antiquewhite': 'faebd7',
+    'aqua': '0ff',
+    'aquamarine': '7fffd4',
+    'azure': 'f0ffff',
+    'beige': 'f5f5dc',
+    'bisque': 'ffe4c4',
+    'black': '000',
+    'blanchedalmond': 'ffebcd',
+    'blue': '00f',
+    'blueviolet': '8a2be2',
+    'brown': 'a52a2a',
+    'burlywood': 'deb887',
+    'cadetblue': '5f9ea0',
+    'chartreuse': '7fff00',
+    'chocolate': 'd2691e',
+    'coral': 'ff7f50',
+    'cornflowerblue': '6495ed',
+    'cornsilk': 'fff8dc',
+    'crimson': 'dc143c',
+    'cyan': '0ff',
+    'darkblue': '00008b',
+    'darkcyan': '008b8b',
+    'darkgoldenrod': 'b8860b',
+    'darkgray': 'a9a9a9',
+    'darkgrey': 'a9a9a9',
+    'darkgreen': '006400',
+    'darkkhaki': 'bdb76b',
+    'darkmagenta': '8b008b',
+    'darkolivegreen': '556b2f',
+    'darkorange': 'ff8c00',
+    'darkorchid': '9932cc',
+    'darkred': '8b0000',
+    'darksalmon': 'e9967a',
+    'darkseagreen': '8fbc8f',
+    'darkslateblue': '483d8b',
+    'darkslategray': '2f4f4f',
+    'darkslategrey': '2f4f4f',
+    'darkturquoise': '00ced1',
+    'darkviolet': '9400d3',
+    'deeppink': 'ff1493',
+    'deepskyblue': '00bfff',
+    'dimgray': '696969',
+    'dimgrey': '696969',
+    'dodgerblue': '1e90ff',
+    'firebrick': 'b22222',
+    'floralwhite': 'fffaf0',
+    'forestgreen': '228b22',
+    'fuchsia': 'f0f',
+    'gainsboro': 'dcdcdc',
+    'ghostwhite': 'f8f8ff',
+    'gold': 'ffd700',
+    'goldenrod': 'daa520',
+    'gray': '808080',
+    'grey': '808080',
+    'green': '008000',
+    'greenyellow': 'adff2f',
+    'honeydew': 'f0fff0',
+    'hotpink': 'ff69b4',
+    'indianred': 'cd5c5c',
+    'indigo': '4b0082',
+    'ivory': 'fffff0',
+    'khaki': 'f0e68c',
+    'lavender': 'e6e6fa',
+    'lavenderblush': 'fff0f5',
+    'lawngreen': '7cfc00',
+    'lemonchiffon': 'fffacd',
+    'lightblue': 'add8e6',
+    'lightcoral': 'f08080',
+    'lightcyan': 'e0ffff',
+    'lightgoldenrodyellow': 'fafad2',
+    'lightgray': 'd3d3d3',
+    'lightgrey': 'd3d3d3',
+    'lightgreen': '90ee90',
+    'lightpink': 'ffb6c1',
+    'lightsalmon': 'ffa07a',
+    'lightseagreen': '20b2aa',
+    'lightskyblue': '87cefa',
+    'lightslategray': '789',
+    'lightslategrey': '789',
+    'lightsteelblue': 'b0c4de',
+    'lightyellow': 'ffffe0',
+    'lime': '0f0',
+    'limegreen': '32cd32',
+    'linen': 'faf0e6',
+    'magenta': 'f0f',
+    'maroon': '800000',
+    'mediumaquamarine': '66cdaa',
+    'mediumblue': '0000cd',
+    'mediumorchid': 'ba55d3',
+    'mediumpurple': '9370db',
+    'mediumseagreen': '3cb371',
+    'mediumslateblue': '7b68ee',
+    'mediumspringgreen': '00fa9a',
+    'mediumturquoise': '48d1cc',
+    'mediumvioletred': 'c71585',
+    'midnightblue': '191970',
+    'mintcream': 'f5fffa',
+    'mistyrose': 'ffe4e1',
+    'moccasin': 'ffe4b5',
+    'navajowhite': 'ffdead',
+    'navy': '000080',
+    'oldlace': 'fdf5e6',
+    'olive': '808000',
+    'olivedrab': '6b8e23',
+    'orange': 'ffa500',
+    'orangered': 'ff4500',
+    'orchid': 'da70d6',
+    'palegoldenrod': 'eee8aa',
+    'palegreen': '98fb98',
+    'paleturquoise': 'afeeee',
+    'palevioletred': 'db7093',
+    'papayawhip': 'ffefd5',
+    'peachpuff': 'ffdab9',
+    'peru': 'cd853f',
+    'pink': 'ffc0cb',
+    'plum': 'dda0dd',
+    'powderblue': 'b0e0e6',
+    'purple': '800080',
+    'rebeccapurple': '639',
+    'red': 'f00',
+    'rosybrown': 'bc8f8f',
+    'royalblue': '4169e1',
+    'saddlebrown': '8b4513',
+    'salmon': 'fa8072',
+    'sandybrown': 'f4a460',
+    'seagreen': '2e8b57',
+    'seashell': 'fff5ee',
+    'sienna': 'a0522d',
+    'silver': 'c0c0c0',
+    'skyblue': '87ceeb',
+    'slateblue': '6a5acd',
+    'slategray': '708090',
+    'slategrey': '708090',
+    'snow': 'fffafa',
+    'springgreen': '00ff7f',
+    'steelblue': '4682b4',
+    'tan': 'd2b48c',
+    'teal': '008080',
+    'thistle': 'd8bfd8',
+    'tomato': 'ff6347',
+    'turquoise': '40e0d0',
+    'violet': 'ee82ee',
+    'wheat': 'f5deb3',
+    'white': 'fff',
+    'whitesmoke': 'f5f5f5',
+    'yellow': 'ff0',
+    'yellowgreen': '9acd32'
+};
+
+var HEX_TO_NAME = {
+    '800000': 'maroon',
+    '800080': 'purple',
+    '808000': 'olive',
+    '808080': 'gray',
+    '00ffff': 'cyan',
+    'f0ffff': 'azure',
+    'f5f5dc': 'beige',
+    'ffe4c4': 'bisque',
+    '000000': 'black',
+    '0000ff': 'blue',
+    'a52a2a': 'brown',
+    'ff7f50': 'coral',
+    'ffd700': 'gold',
+    '008000': 'green',
+    '4b0082': 'indigo',
+    'fffff0': 'ivory',
+    'f0e68c': 'khaki',
+    '00ff00': 'lime',
+    'faf0e6': 'linen',
+    '000080': 'navy',
+    'ffa500': 'orange',
+    'da70d6': 'orchid',
+    'cd853f': 'peru',
+    'ffc0cb': 'pink',
+    'dda0dd': 'plum',
+    'f00': 'red',
+    'ff0000': 'red',
+    'fa8072': 'salmon',
+    'a0522d': 'sienna',
+    'c0c0c0': 'silver',
+    'fffafa': 'snow',
+    'd2b48c': 'tan',
+    '008080': 'teal',
+    'ff6347': 'tomato',
+    'ee82ee': 'violet',
+    'f5deb3': 'wheat',
+    'ffffff': 'white',
+    'ffff00': 'yellow'
+};
+
+function hueToRgb(p, q, t) {
+    if (t < 0) {
+        t += 1;
+    }
+    if (t > 1) {
+        t -= 1;
+    }
+    if (t < 1 / 6) {
+        return p + (q - p) * 6 * t;
+    }
+    if (t < 1 / 2) {
+        return q;
+    }
+    if (t < 2 / 3) {
+        return p + (q - p) * (2 / 3 - t) * 6;
+    }
+    return p;
+}
+
+function hslToRgb(h, s, l, a) {
+    var r;
+    var g;
+    var b;
+
+    if (s == 0) {
+        r = g = b = l; // achromatic
+    } else {
+        var q = l < 0.5 ? l * (1 + s) : l + s - l * s;
+        var p = 2 * l - q;
+
+        r = hueToRgb(p, q, h + 1 / 3);
+        g = hueToRgb(p, q, h);
+        b = hueToRgb(p, q, h - 1 / 3);
+    }
+
+    return [
+        Math.round(r * 255),
+        Math.round(g * 255),
+        Math.round(b * 255),
+        a
+    ];
+}
+
+function toHex(value) {
+    value = value.toString(16);
+    return value.length === 1 ? '0' + value : value;
+}
+
+function parseFunctionArgs(functionArgs, count, rgb) {
+    var argument = functionArgs.head;
+    var args = [];
+
+    while (argument !== null) {
+        var argumentPart = argument.data.sequence.head;
+        var wasValue = false;
+
+        while (argumentPart !== null) {
+            var value = argumentPart.data;
+            var type = value.type;
+
+            switch (type) {
+                case 'Number':
+                case 'Percentage':
+                    if (wasValue) {
+                        return;
+                    }
+
+                    wasValue = true;
+                    args.push({
+                        type: type,
+                        value: Number(value.value)
+                    });
+                    break;
+
+                case 'Operator':
+                    if (wasValue || value.value !== '+') {
+                        return;
+                    }
+                    break;
+
+                default:
+                    // something we couldn't understand
+                    return;
+            }
+
+            argumentPart = argumentPart.next;
+        }
+
+        argument = argument.next;
+    }
+
+    if (args.length !== count) {
+        // invalid arguments count
+        // TODO: remove those tokens
+        return;
+    }
+
+    if (args.length === 4) {
+        if (args[3].type !== 'Number') {
+            // 4th argument should be a number
+            // TODO: remove those tokens
+            return;
+        }
+
+        args[3].type = 'Alpha';
+    }
+
+    if (rgb) {
+        if (args[0].type !== args[1].type || args[0].type !== args[2].type) {
+            // invalid color, numbers and percentage shouldn't be mixed
+            // TODO: remove those tokens
+            return;
+        }
+    } else {
+        if (args[0].type !== 'Number' ||
+            args[1].type !== 'Percentage' ||
+            args[2].type !== 'Percentage') {
+            // invalid color, for hsl values should be: number, percentage, percentage
+            // TODO: remove those tokens
+            return;
+        }
+
+        args[0].type = 'Angle';
+    }
+
+    return args.map(function(arg) {
+        var value = Math.max(0, arg.value);
+
+        switch (arg.type) {
+            case 'Number':
+                // fit value to [0..255] range
+                value = Math.min(value, 255);
+                break;
+
+            case 'Percentage':
+                // convert 0..100% to value in [0..255] range
+                value = Math.min(value, 100) / 100;
+
+                if (!rgb) {
+                    return value;
+                }
+
+                value = 255 * value;
+                break;
+
+            case 'Angle':
+                // fit value to (-360..360) range
+                return (((value % 360) + 360) % 360) / 360;
+
+            case 'Alpha':
+                // fit value to [0..1] range
+                return Math.min(value, 1);
+        }
+
+        return Math.round(value);
+    });
+}
+
+function compressFunction(node, item, list) {
+    var functionName = node.name;
+    var args;
+
+    if (functionName === 'rgba' || functionName === 'hsla') {
+        args = parseFunctionArgs(node.arguments, 4, functionName === 'rgba');
+
+        if (!args) {
+            // something went wrong
+            return;
+        }
+
+        if (functionName === 'hsla') {
+            args = hslToRgb.apply(null, args);
+            node.name = 'rgba';
+        }
+
+        if (args[3] !== 1) {
+            // replace argument values for normalized/interpolated
+            node.arguments.each(function(argument) {
+                var item = argument.sequence.head;
+
+                if (item.data.type === 'Operator') {
+                    item = item.next;
+                }
+
+                argument.sequence = new List([{
+                    type: 'Number',
+                    info: item.data.info,
+                    value: packNumber(args.shift())
+                }]);
+            });
+
+            return;
+        }
+
+        // otherwise convert to rgb, i.e. rgba(255, 0, 0, 1) -> rgb(255, 0, 0)
+        functionName = 'rgb';
+    }
+
+    if (functionName === 'hsl') {
+        args = args || parseFunctionArgs(node.arguments, 3, false);
+
+        if (!args) {
+            // something went wrong
+            return;
+        }
+
+        // convert to rgb
+        args = hslToRgb.apply(null, args);
+        functionName = 'rgb';
+    }
+
+    if (functionName === 'rgb') {
+        args = args || parseFunctionArgs(node.arguments, 3, true);
+
+        if (!args) {
+            // something went wrong
+            return;
+        }
+
+        // check if color is not at the end and not followed by space
+        var next = item.next;
+        if (next && next.data.type !== 'Space') {
+            list.insert(list.createItem({
+                type: 'Space'
+            }), next);
+        }
+
+        item.data = {
+            type: 'Hash',
+            info: node.info,
+            value: toHex(args[0]) + toHex(args[1]) + toHex(args[2])
+        };
+
+        compressHex(item.data, item);
+    }
+}
+
+function compressIdent(node, item) {
+    if (this.declaration === null) {
+        return;
+    }
+
+    var color = node.name.toLowerCase();
+
+    if (NAME_TO_HEX.hasOwnProperty(color)) {
+        var hex = NAME_TO_HEX[color];
+
+        if (hex.length + 1 <= color.length) {
+            // replace for shorter hex value
+            item.data = {
+                type: 'Hash',
+                info: node.info,
+                value: hex
+            };
+        } else {
+            // special case for consistent colors
+            if (color === 'grey') {
+                color = 'gray';
+            }
+
+            // just replace value for lower cased name
+            node.name = color;
+        }
+    }
+}
+
+function compressHex(node, item) {
+    var color = node.value.toLowerCase();
+
+    // #112233 -> #123
+    if (color.length === 6 &&
+        color[0] === color[1] &&
+        color[2] === color[3] &&
+        color[4] === color[5]) {
+        color = color[0] + color[2] + color[4];
+    }
+
+    if (HEX_TO_NAME[color]) {
+        item.data = {
+            type: 'Identifier',
+            info: node.info,
+            name: HEX_TO_NAME[color]
+        };
+    } else {
+        node.value = color;
+    }
+}
+
+module.exports = {
+    compressFunction: compressFunction,
+    compressIdent: compressIdent,
+    compressHex: compressHex
+};
diff --git a/node_modules/csso/lib/compressor/compress/index.js b/node_modules/csso/lib/compressor/compress/index.js
new file mode 100644
index 00000000..ff6b0296
--- /dev/null
+++ b/node_modules/csso/lib/compressor/compress/index.js
@@ -0,0 +1,22 @@
+var walk = require('../../utils/walk.js').all;
+var handlers = {
+    Atrule: require('./Atrule.js'),
+    Attribute: require('./Attribute.js'),
+    Value: require('./Value.js'),
+    Dimension: require('./Dimension.js'),
+    Percentage: require('./Number.js'),
+    Number: require('./Number.js'),
+    String: require('./String.js'),
+    Url: require('./Url.js'),
+    Hash: require('./color.js').compressHex,
+    Identifier: require('./color.js').compressIdent,
+    Function: require('./color.js').compressFunction
+};
+
+module.exports = function(ast) {
+    walk(ast, function(node, item, list) {
+        if (handlers.hasOwnProperty(node.type)) {
+            handlers[node.type].call(this, node, item, list);
+        }
+    });
+};
diff --git a/node_modules/csso/lib/compressor/compress/property/background.js b/node_modules/csso/lib/compressor/compress/property/background.js
new file mode 100644
index 00000000..210127a9
--- /dev/null
+++ b/node_modules/csso/lib/compressor/compress/property/background.js
@@ -0,0 +1,66 @@
+var List = require('../../../utils/list.js');
+
+module.exports = function compressBackground(node) {
+    function lastType() {
+        if (buffer.length) {
+            return buffer[buffer.length - 1].type;
+        }
+    }
+
+    function flush() {
+        if (lastType() === 'Space') {
+            buffer.pop();
+        }
+
+        if (!buffer.length) {
+            buffer.unshift(
+                {
+                    type: 'Number',
+                    value: '0'
+                },
+                {
+                    type: 'Space'
+                },
+                {
+                    type: 'Number',
+                    value: '0'
+                }
+            );
+        }
+
+        newValue.push.apply(newValue, buffer);
+
+        buffer = [];
+    }
+
+    var newValue = [];
+    var buffer = [];
+
+    node.sequence.each(function(node) {
+        if (node.type === 'Operator' && node.value === ',') {
+            flush();
+            newValue.push(node);
+            return;
+        }
+
+        // remove defaults
+        if (node.type === 'Identifier') {
+            if (node.name === 'transparent' ||
+                node.name === 'none' ||
+                node.name === 'repeat' ||
+                node.name === 'scroll') {
+                return;
+            }
+        }
+
+        // don't add redundant spaces
+        if (node.type === 'Space' && (!buffer.length || lastType() === 'Space')) {
+            return;
+        }
+
+        buffer.push(node);
+    });
+
+    flush();
+    node.sequence = new List(newValue);
+};
diff --git a/node_modules/csso/lib/compressor/compress/property/font-weight.js b/node_modules/csso/lib/compressor/compress/property/font-weight.js
new file mode 100644
index 00000000..29122eb6
--- /dev/null
+++ b/node_modules/csso/lib/compressor/compress/property/font-weight.js
@@ -0,0 +1,22 @@
+module.exports = function compressFontWeight(node) {
+    var value = node.sequence.head.data;
+
+    if (value.type === 'Identifier') {
+        switch (value.name) {
+            case 'normal':
+                node.sequence.head.data = {
+                    type: 'Number',
+                    info: value.info,
+                    value: '400'
+                };
+                break;
+            case 'bold':
+                node.sequence.head.data = {
+                    type: 'Number',
+                    info: value.info,
+                    value: '700'
+                };
+                break;
+        }
+    }
+};
diff --git a/node_modules/csso/lib/compressor/compress/property/font.js b/node_modules/csso/lib/compressor/compress/property/font.js
new file mode 100644
index 00000000..783685f4
--- /dev/null
+++ b/node_modules/csso/lib/compressor/compress/property/font.js
@@ -0,0 +1,45 @@
+module.exports = function compressFont(node) {
+    var list = node.sequence;
+
+    list.eachRight(function(node, item) {
+        if (node.type === 'Identifier') {
+            if (node.name === 'bold') {
+                item.data = {
+                    type: 'Number',
+                    info: node.info,
+                    value: '700'
+                };
+            } else if (node.name === 'normal') {
+                var prev = item.prev;
+
+                if (prev && prev.data.type === 'Operator' && prev.data.value === '/') {
+                    this.remove(prev);
+                }
+
+                this.remove(item);
+            } else if (node.name === 'medium') {
+                var next = item.next;
+
+                if (!next || next.data.type !== 'Operator') {
+                    this.remove(item);
+                }
+            }
+        }
+    });
+
+    // remove redundant spaces
+    list.each(function(node, item) {
+        if (node.type === 'Space') {
+            if (!item.prev || !item.next || item.next.data.type === 'Space') {
+                this.remove(item);
+            }
+        }
+    });
+
+    if (list.isEmpty()) {
+        list.insert(list.createItem({
+            type: 'Identifier',
+            name: 'normal'
+        }));
+    }
+};
diff --git a/node_modules/csso/lib/compressor/index.js b/node_modules/csso/lib/compressor/index.js
new file mode 100644
index 00000000..6d3fdeba
--- /dev/null
+++ b/node_modules/csso/lib/compressor/index.js
@@ -0,0 +1,186 @@
+var List = require('../utils/list');
+var clone = require('../utils/clone');
+var usageUtils = require('./usage');
+var clean = require('./clean');
+var compress = require('./compress');
+var restructureBlock = require('./restructure');
+var walkRules = require('../utils/walk').rules;
+
+function readRulesChunk(rules, specialComments) {
+    var buffer = new List();
+    var nonSpaceTokenInBuffer = false;
+    var protectedComment;
+
+    rules.nextUntil(rules.head, function(node, item, list) {
+        if (node.type === 'Comment') {
+            if (!specialComments || node.value.charAt(0) !== '!') {
+                list.remove(item);
+                return;
+            }
+
+            if (nonSpaceTokenInBuffer || protectedComment) {
+                return true;
+            }
+
+            list.remove(item);
+            protectedComment = node;
+            return;
+        }
+
+        if (node.type !== 'Space') {
+            nonSpaceTokenInBuffer = true;
+        }
+
+        buffer.insert(list.remove(item));
+    });
+
+    return {
+        comment: protectedComment,
+        stylesheet: {
+            type: 'StyleSheet',
+            info: null,
+            rules: buffer
+        }
+    };
+}
+
+function compressChunk(ast, firstAtrulesAllowed, usageData, num, logger) {
+    logger('Compress block #' + num, null, true);
+
+    var seed = 1;
+    walkRules(ast, function markStylesheets() {
+        if ('id' in this.stylesheet === false) {
+            this.stylesheet.firstAtrulesAllowed = firstAtrulesAllowed;
+            this.stylesheet.id = seed++;
+        }
+    });
+    logger('init', ast);
+
+    // remove redundant
+    clean(ast, usageData);
+    logger('clean', ast);
+
+    // compress nodes
+    compress(ast, usageData);
+    logger('compress', ast);
+
+    return ast;
+}
+
+function getCommentsOption(options) {
+    var comments = 'comments' in options ? options.comments : 'exclamation';
+
+    if (typeof comments === 'boolean') {
+        comments = comments ? 'exclamation' : false;
+    } else if (comments !== 'exclamation' && comments !== 'first-exclamation') {
+        comments = false;
+    }
+
+    return comments;
+}
+
+function getRestructureOption(options) {
+    return 'restructure' in options ? options.restructure :
+           'restructuring' in options ? options.restructuring :
+           true;
+}
+
+function wrapBlock(block) {
+    return new List([{
+        type: 'Ruleset',
+        selector: {
+            type: 'Selector',
+            selectors: new List([{
+                type: 'SimpleSelector',
+                sequence: new List([{
+                    type: 'Identifier',
+                    name: 'x'
+                }])
+            }])
+        },
+        block: block
+    }]);
+}
+
+module.exports = function compress(ast, options) {
+    ast = ast || { type: 'StyleSheet', info: null, rules: new List() };
+    options = options || {};
+
+    var logger = typeof options.logger === 'function' ? options.logger : Function();
+    var specialComments = getCommentsOption(options);
+    var restructuring = getRestructureOption(options);
+    var firstAtrulesAllowed = true;
+    var usageData = false;
+    var inputRules;
+    var outputRules = new List();
+    var chunk;
+    var chunkNum = 1;
+    var chunkRules;
+
+    if (options.clone) {
+        ast = clone(ast);
+    }
+
+    if (ast.type === 'StyleSheet') {
+        inputRules = ast.rules;
+        ast.rules = outputRules;
+    } else {
+        inputRules = wrapBlock(ast);
+    }
+
+    if (options.usage) {
+        usageData = usageUtils.buildIndex(options.usage);
+    }
+
+    do {
+        chunk = readRulesChunk(inputRules, Boolean(specialComments));
+
+        compressChunk(chunk.stylesheet, firstAtrulesAllowed, usageData, chunkNum++, logger);
+
+        // structure optimisations
+        if (restructuring) {
+            restructureBlock(chunk.stylesheet, usageData, logger);
+        }
+
+        chunkRules = chunk.stylesheet.rules;
+
+        if (chunk.comment) {
+            // add \n before comment if there is another content in outputRules
+            if (!outputRules.isEmpty()) {
+                outputRules.insert(List.createItem({
+                    type: 'Raw',
+                    value: '\n'
+                }));
+            }
+
+            outputRules.insert(List.createItem(chunk.comment));
+
+            // add \n after comment if chunk is not empty
+            if (!chunkRules.isEmpty()) {
+                outputRules.insert(List.createItem({
+                    type: 'Raw',
+                    value: '\n'
+                }));
+            }
+        }
+
+        if (firstAtrulesAllowed && !chunkRules.isEmpty()) {
+            var lastRule = chunkRules.last();
+
+            if (lastRule.type !== 'Atrule' ||
+               (lastRule.name !== 'import' && lastRule.name !== 'charset')) {
+                firstAtrulesAllowed = false;
+            }
+        }
+
+        if (specialComments !== 'exclamation') {
+            specialComments = false;
+        }
+
+        outputRules.appendList(chunkRules);
+    } while (!inputRules.isEmpty());
+
+    return {
+        ast: ast
+    };
+};
diff --git a/node_modules/csso/lib/compressor/restructure/1-initialMergeRuleset.js b/node_modules/csso/lib/compressor/restructure/1-initialMergeRuleset.js
new file mode 100644
index 00000000..036a04b4
--- /dev/null
+++ b/node_modules/csso/lib/compressor/restructure/1-initialMergeRuleset.js
@@ -0,0 +1,48 @@
+var utils = require('./utils.js');
+var walkRules = require('../../utils/walk.js').rules;
+
+function processRuleset(node, item, list) {
+    var selectors = node.selector.selectors;
+    var declarations = node.block.declarations;
+
+    list.prevUntil(item.prev, function(prev) {
+        // skip non-ruleset node if safe
+        if (prev.type !== 'Ruleset') {
+            return utils.unsafeToSkipNode.call(selectors, prev);
+        }
+
+        var prevSelectors = prev.selector.selectors;
+        var prevDeclarations = prev.block.declarations;
+
+        // try to join rulesets with equal pseudo signature
+        if (node.pseudoSignature === prev.pseudoSignature) {
+            // try to join by selectors
+            if (utils.isEqualLists(prevSelectors, selectors)) {
+                prevDeclarations.appendList(declarations);
+                list.remove(item);
+                return true;
+            }
+
+            // try to join by declarations
+            if (utils.isEqualDeclarations(declarations, prevDeclarations)) {
+                utils.addSelectors(prevSelectors, selectors);
+                list.remove(item);
+                return true;
+            }
+        }
+
+        // go to prev ruleset if has no selector similarities
+        return utils.hasSimilarSelectors(selectors, prevSelectors);
+    });
+};
+
+// NOTE: direction should be left to right, since rulesets merge to left
+// ruleset. When direction right to left unmerged rulesets may prevent lookup
+// TODO: remove initial merge
+module.exports = function initialMergeRuleset(ast) {
+    walkRules(ast, function(node, item, list) {
+        if (node.type === 'Ruleset') {
+            processRuleset(node, item, list);
+        }
+    });
+};
diff --git a/node_modules/csso/lib/compressor/restructure/2-mergeAtrule.js b/node_modules/csso/lib/compressor/restructure/2-mergeAtrule.js
new file mode 100644
index 00000000..d07318f7
--- /dev/null
+++ b/node_modules/csso/lib/compressor/restructure/2-mergeAtrule.js
@@ -0,0 +1,35 @@
+var walkRulesRight = require('../../utils/walk.js').rulesRight;
+
+function isMediaRule(node) {
+    return node.type === 'Atrule' && node.name === 'media';
+}
+
+function processAtrule(node, item, list) {
+    if (!isMediaRule(node)) {
+        return;
+    }
+
+    var prev = item.prev && item.prev.data;
+
+    if (!prev || !isMediaRule(prev)) {
+        return;
+    }
+
+    // merge @media with same query
+    if (node.expression.id === prev.expression.id) {
+        prev.block.rules.appendList(node.block.rules);
+        prev.info = {
+            primary: prev.info,
+            merged: node.info
+        };
+        list.remove(item);
+    }
+};
+
+module.exports = function rejoinAtrule(ast) {
+    walkRulesRight(ast, function(node, item, list) {
+        if (node.type === 'Atrule') {
+            processAtrule(node, item, list);
+        }
+    });
+};
diff --git a/node_modules/csso/lib/compressor/restructure/3-disjoinRuleset.js b/node_modules/csso/lib/compressor/restructure/3-disjoinRuleset.js
new file mode 100644
index 00000000..6df4f807
--- /dev/null
+++ b/node_modules/csso/lib/compressor/restructure/3-disjoinRuleset.js
@@ -0,0 +1,42 @@
+var List = require('../../utils/list.js');
+var walkRulesRight = require('../../utils/walk.js').rulesRight;
+
+function processRuleset(node, item, list) {
+    var selectors = node.selector.selectors;
+
+    // generate new rule sets:
+    // .a, .b { color: red; }
+    // ->
+    // .a { color: red; }
+    // .b { color: red; }
+
+    // while there are more than 1 simple selector split for rulesets
+    while (selectors.head !== selectors.tail) {
+        var newSelectors = new List();
+        newSelectors.insert(selectors.remove(selectors.head));
+
+        list.insert(list.createItem({
+            type: 'Ruleset',
+            info: node.info,
+            pseudoSignature: node.pseudoSignature,
+            selector: {
+                type: 'Selector',
+                info: node.selector.info,
+                selectors: newSelectors
+            },
+            block: {
+                type: 'Block',
+                info: node.block.info,
+                declarations: node.block.declarations.copy()
+            }
+        }), item);
+    }
+};
+
+module.exports = function disjoinRuleset(ast) {
+    walkRulesRight(ast, function(node, item, list) {
+        if (node.type === 'Ruleset') {
+            processRuleset(node, item, list);
+        }
+    });
+};
diff --git a/node_modules/csso/lib/compressor/restructure/4-restructShorthand.js b/node_modules/csso/lib/compressor/restructure/4-restructShorthand.js
new file mode 100644
index 00000000..aa95e3cc
--- /dev/null
+++ b/node_modules/csso/lib/compressor/restructure/4-restructShorthand.js
@@ -0,0 +1,430 @@
+var List = require('../../utils/list.js');
+var translate = require('../../utils/translate.js');
+var walkRulesRight = require('../../utils/walk.js').rulesRight;
+
+var REPLACE = 1;
+var REMOVE = 2;
+var TOP = 0;
+var RIGHT = 1;
+var BOTTOM = 2;
+var LEFT = 3;
+var SIDES = ['top', 'right', 'bottom', 'left'];
+var SIDE = {
+    'margin-top': 'top',
+    'margin-right': 'right',
+    'margin-bottom': 'bottom',
+    'margin-left': 'left',
+
+    'padding-top': 'top',
+    'padding-right': 'right',
+    'padding-bottom': 'bottom',
+    'padding-left': 'left',
+
+    'border-top-color': 'top',
+    'border-right-color': 'right',
+    'border-bottom-color': 'bottom',
+    'border-left-color': 'left',
+    'border-top-width': 'top',
+    'border-right-width': 'right',
+    'border-bottom-width': 'bottom',
+    'border-left-width': 'left',
+    'border-top-style': 'top',
+    'border-right-style': 'right',
+    'border-bottom-style': 'bottom',
+    'border-left-style': 'left'
+};
+var MAIN_PROPERTY = {
+    'margin': 'margin',
+    'margin-top': 'margin',
+    'margin-right': 'margin',
+    'margin-bottom': 'margin',
+    'margin-left': 'margin',
+
+    'padding': 'padding',
+    'padding-top': 'padding',
+    'padding-right': 'padding',
+    'padding-bottom': 'padding',
+    'padding-left': 'padding',
+
+    'border-color': 'border-color',
+    'border-top-color': 'border-color',
+    'border-right-color': 'border-color',
+    'border-bottom-color': 'border-color',
+    'border-left-color': 'border-color',
+    'border-width': 'border-width',
+    'border-top-width': 'border-width',
+    'border-right-width': 'border-width',
+    'border-bottom-width': 'border-width',
+    'border-left-width': 'border-width',
+    'border-style': 'border-style',
+    'border-top-style': 'border-style',
+    'border-right-style': 'border-style',
+    'border-bottom-style': 'border-style',
+    'border-left-style': 'border-style'
+};
+
+function TRBL(name) {
+    this.name = name;
+    this.info = null;
+    this.iehack = undefined;
+    this.sides = {
+        'top': null,
+        'right': null,
+        'bottom': null,
+        'left': null
+    };
+}
+
+TRBL.prototype.getValueSequence = function(value, count) {
+    var values = [];
+    var iehack = '';
+    var hasBadValues = value.sequence.some(function(child) {
+        var special = false;
+
+        switch (child.type) {
+            case 'Identifier':
+                switch (child.name) {
+                    case '\\0':
+                    case '\\9':
+                        iehack = child.name;
+                        return;
+
+                    case 'inherit':
+                    case 'initial':
+                    case 'unset':
+                    case 'revert':
+                        special = child.name;
+                        break;
+                }
+                break;
+
+            case 'Dimension':
+                switch (child.unit) {
+                    // is not supported until IE11
+                    case 'rem':
+
+                    // v* units is too buggy across browsers and better
+                    // don't merge values with those units
+                    case 'vw':
+                    case 'vh':
+                    case 'vmin':
+                    case 'vmax':
+                    case 'vm': // IE9 supporting "vm" instead of "vmin".
+                        special = child.unit;
+                        break;
+                }
+                break;
+
+            case 'Hash': // color
+            case 'Number':
+            case 'Percentage':
+                break;
+
+            case 'Function':
+                special = child.name;
+                break;
+
+            case 'Space':
+                return false; // ignore space
+
+            default:
+                return true;  // bad value
+        }
+
+        values.push({
+            node: child,
+            special: special,
+            important: value.important
+        });
+    });
+
+    if (hasBadValues || values.length > count) {
+        return false;
+    }
+
+    if (typeof this.iehack === 'string' && this.iehack !== iehack) {
+        return false;
+    }
+
+    this.iehack = iehack; // move outside
+
+    return values;
+};
+
+TRBL.prototype.canOverride = function(side, value) {
+    var currentValue = this.sides[side];
+
+    return !currentValue || (value.important && !currentValue.important);
+};
+
+TRBL.prototype.add = function(name, value, info) {
+    function attemptToAdd() {
+        var sides = this.sides;
+        var side = SIDE[name];
+
+        if (side) {
+            if (side in sides === false) {
+                return false;
+            }
+
+            var values = this.getValueSequence(value, 1);
+
+            if (!values || !values.length) {
+                return false;
+            }
+
+            // can mix only if specials are equal
+            for (var key in sides) {
+                if (sides[key] !== null && sides[key].special !== values[0].special) {
+                    return false;
+                }
+            }
+
+            if (!this.canOverride(side, values[0])) {
+                return true;
+            }
+
+            sides[side] = values[0];
+            return true;
+        } else if (name === this.name) {
+            var values = this.getValueSequence(value, 4);
+
+            if (!values || !values.length) {
+                return false;
+            }
+
+            switch (values.length) {
+                case 1:
+                    values[RIGHT] = values[TOP];
+                    values[BOTTOM] = values[TOP];
+                    values[LEFT] = values[TOP];
+                    break;
+
+                case 2:
+                    values[BOTTOM] = values[TOP];
+                    values[LEFT] = values[RIGHT];
+                    break;
+
+                case 3:
+                    values[LEFT] = values[RIGHT];
+                    break;
+            }
+
+            // can mix only if specials are equal
+            for (var i = 0; i < 4; i++) {
+                for (var key in sides) {
+                    if (sides[key] !== null && sides[key].special !== values[i].special) {
+                        return false;
+                    }
+                }
+            }
+
+            for (var i = 0; i < 4; i++) {
+                if (this.canOverride(SIDES[i], values[i])) {
+                    sides[SIDES[i]] = values[i];
+                }
+            }
+
+            return true;
+        }
+    }
+
+    if (!attemptToAdd.call(this)) {
+        return false;
+    }
+
+    if (this.info) {
+        this.info = {
+            primary: this.info,
+            merged: info
+        };
+    } else {
+        this.info = info;
+    }
+
+    return true;
+};
+
+TRBL.prototype.isOkToMinimize = function() {
+    var top = this.sides.top;
+    var right = this.sides.right;
+    var bottom = this.sides.bottom;
+    var left = this.sides.left;
+
+    if (top && right && bottom && left) {
+        var important =
+            top.important +
+            right.important +
+            bottom.important +
+            left.important;
+
+        return important === 0 || important === 4;
+    }
+
+    return false;
+};
+
+TRBL.prototype.getValue = function() {
+    var result = [];
+    var sides = this.sides;
+    var values = [
+        sides.top,
+        sides.right,
+        sides.bottom,
+        sides.left
+    ];
+    var stringValues = [
+        translate(sides.top.node),
+        translate(sides.right.node),
+        translate(sides.bottom.node),
+        translate(sides.left.node)
+    ];
+
+    if (stringValues[LEFT] === stringValues[RIGHT]) {
+        values.pop();
+        if (stringValues[BOTTOM] === stringValues[TOP]) {
+            values.pop();
+            if (stringValues[RIGHT] === stringValues[TOP]) {
+                values.pop();
+            }
+        }
+    }
+
+    for (var i = 0; i < values.length; i++) {
+        if (i) {
+            result.push({ type: 'Space' });
+        }
+
+        result.push(values[i].node);
+    }
+
+    if (this.iehack) {
+        result.push({ type: 'Space' }, {
+            type: 'Identifier',
+            info: {},
+            name: this.iehack
+        });
+    }
+
+    return {
+        type: 'Value',
+        info: {},
+        important: sides.top.important,
+        sequence: new List(result)
+    };
+};
+
+TRBL.prototype.getProperty = function() {
+    return {
+        type: 'Property',
+        info: {},
+        name: this.name
+    };
+};
+
+function processRuleset(ruleset, shorts, shortDeclarations, lastShortSelector) {
+    var declarations = ruleset.block.declarations;
+    var selector = ruleset.selector.selectors.first().id;
+
+    ruleset.block.declarations.eachRight(function(declaration, item) {
+        var property = declaration.property.name;
+
+        if (!MAIN_PROPERTY.hasOwnProperty(property)) {
+            return;
+        }
+
+        var key = MAIN_PROPERTY[property];
+        var shorthand;
+        var operation;
+
+        if (!lastShortSelector || selector === lastShortSelector) {
+            if (key in shorts) {
+                operation = REMOVE;
+                shorthand = shorts[key];
+            }
+        }
+
+        if (!shorthand || !shorthand.add(property, declaration.value, declaration.info)) {
+            operation = REPLACE;
+            shorthand = new TRBL(key);
+
+            // if can't parse value ignore it and break shorthand sequence
+            if (!shorthand.add(property, declaration.value, declaration.info)) {
+                lastShortSelector = null;
+                return;
+            }
+        }
+
+        shorts[key] = shorthand;
+        shortDeclarations.push({
+            operation: operation,
+            block: declarations,
+            item: item,
+            shorthand: shorthand
+        });
+
+        lastShortSelector = selector;
+    });
+
+    return lastShortSelector;
+};
+
+function processShorthands(shortDeclarations, markDeclaration) {
+    shortDeclarations.forEach(function(item) {
+        var shorthand = item.shorthand;
+
+        if (!shorthand.isOkToMinimize()) {
+            return;
+        }
+
+        if (item.operation === REPLACE) {
+            item.item.data = markDeclaration({
+                type: 'Declaration',
+                info: shorthand.info,
+                property: shorthand.getProperty(),
+                value: shorthand.getValue(),
+                id: 0,
+                length: 0,
+                fingerprint: null
+            });
+        } else {
+            item.block.remove(item.item);
+        }
+    });
+};
+
+module.exports = function restructBlock(ast, indexer) {
+    var stylesheetMap = {};
+    var shortDeclarations = [];
+
+    walkRulesRight(ast, function(node) {
+        if (node.type !== 'Ruleset') {
+            return;
+        }
+
+        var stylesheet = this.stylesheet;
+        var rulesetId = (node.pseudoSignature || '') + '|' + node.selector.selectors.first().id;
+        var rulesetMap;
+        var shorts;
+
+        if (!stylesheetMap.hasOwnProperty(stylesheet.id)) {
+            rulesetMap = {
+                lastShortSelector: null
+            };
+            stylesheetMap[stylesheet.id] = rulesetMap;
+        } else {
+            rulesetMap = stylesheetMap[stylesheet.id];
+        }
+
+        if (rulesetMap.hasOwnProperty(rulesetId)) {
+            shorts = rulesetMap[rulesetId];
+        } else {
+            shorts = {};
+            rulesetMap[rulesetId] = shorts;
+        }
+
+        rulesetMap.lastShortSelector = processRuleset.call(this, node, shorts, shortDeclarations, rulesetMap.lastShortSelector);
+    });
+
+    processShorthands(shortDeclarations, indexer.declaration);
+};
diff --git a/node_modules/csso/lib/compressor/restructure/6-restructBlock.js b/node_modules/csso/lib/compressor/restructure/6-restructBlock.js
new file mode 100644
index 00000000..4933eed4
--- /dev/null
+++ b/node_modules/csso/lib/compressor/restructure/6-restructBlock.js
@@ -0,0 +1,261 @@
+var resolveProperty = require('../../utils/names.js').property;
+var resolveKeyword = require('../../utils/names.js').keyword;
+var walkRulesRight = require('../../utils/walk.js').rulesRight;
+var translate = require('../../utils/translate.js');
+var dontRestructure = {
+    'src': 1 // https://github.com/afelix/csso/issues/50
+};
+
+var DONT_MIX_VALUE = {
+    // https://developer.mozilla.org/en-US/docs/Web/CSS/display#Browser_compatibility
+    'display': /table|ruby|flex|-(flex)?box$|grid|contents|run-in/i,
+    // https://developer.mozilla.org/en/docs/Web/CSS/text-align
+    'text-align': /^(start|end|match-parent|justify-all)$/i
+};
+
+var CURSOR_SAFE_VALUE = [
+    'auto', 'crosshair', 'default', 'move', 'text', 'wait', 'help',
+    'n-resize', 'e-resize', 's-resize', 'w-resize',
+    'ne-resize', 'nw-resize', 'se-resize', 'sw-resize',
+    'pointer', 'progress', 'not-allowed', 'no-drop', 'vertical-text', 'all-scroll',
+    'col-resize', 'row-resize'
+];
+
+var NEEDLESS_TABLE = {
+    'border-width': ['border'],
+    'border-style': ['border'],
+    'border-color': ['border'],
+    'border-top': ['border'],
+    'border-right': ['border'],
+    'border-bottom': ['border'],
+    'border-left': ['border'],
+    'border-top-width': ['border-top', 'border-width', 'border'],
+    'border-right-width': ['border-right', 'border-width', 'border'],
+    'border-bottom-width': ['border-bottom', 'border-width', 'border'],
+    'border-left-width': ['border-left', 'border-width', 'border'],
+    'border-top-style': ['border-top', 'border-style', 'border'],
+    'border-right-style': ['border-right', 'border-style', 'border'],
+    'border-bottom-style': ['border-bottom', 'border-style', 'border'],
+    'border-left-style': ['border-left', 'border-style', 'border'],
+    'border-top-color': ['border-top', 'border-color', 'border'],
+    'border-right-color': ['border-right', 'border-color', 'border'],
+    'border-bottom-color': ['border-bottom', 'border-color', 'border'],
+    'border-left-color': ['border-left', 'border-color', 'border'],
+    'margin-top': ['margin'],
+    'margin-right': ['margin'],
+    'margin-bottom': ['margin'],
+    'margin-left': ['margin'],
+    'padding-top': ['padding'],
+    'padding-right': ['padding'],
+    'padding-bottom': ['padding'],
+    'padding-left': ['padding'],
+    'font-style': ['font'],
+    'font-variant': ['font'],
+    'font-weight': ['font'],
+    'font-size': ['font'],
+    'font-family': ['font'],
+    'list-style-type': ['list-style'],
+    'list-style-position': ['list-style'],
+    'list-style-image': ['list-style']
+};
+
+function getPropertyFingerprint(propertyName, declaration, fingerprints) {
+    var realName = resolveProperty(propertyName).name;
+
+    if (realName === 'background' ||
+       (realName === 'filter' && declaration.value.sequence.first().type === 'Progid')) {
+        return propertyName + ':' + translate(declaration.value);
+    }
+
+    var declarationId = declaration.id;
+    var fingerprint = fingerprints[declarationId];
+
+    if (!fingerprint) {
+        var vendorId = '';
+        var iehack = '';
+        var special = {};
+
+        declaration.value.sequence.each(function walk(node) {
+            switch (node.type) {
+                case 'Argument':
+                case 'Value':
+                case 'Braces':
+                    node.sequence.each(walk);
+                    break;
+
+                case 'Identifier':
+                    var name = node.name;
+
+                    if (!vendorId) {
+                        vendorId = resolveKeyword(name).vendor;
+                    }
+
+                    if (/\\[09]/.test(name)) {
+                        iehack = RegExp.lastMatch;
+                    }
+
+                    if (realName === 'cursor') {
+                        if (CURSOR_SAFE_VALUE.indexOf(name) === -1) {
+                            special[name] = true;
+                        }
+                    } else if (DONT_MIX_VALUE.hasOwnProperty(realName)) {
+                        if (DONT_MIX_VALUE[realName].test(name)) {
+                            special[name] = true;
+                        }
+                    }
+
+                    break;
+
+                case 'Function':
+                    var name = node.name;
+
+                    if (!vendorId) {
+                        vendorId = resolveKeyword(name).vendor;
+                    }
+
+                    if (name === 'rect') {
+                        // there are 2 forms of rect:
+                        //   rect(<top>, <right>, <bottom>, <left>) - standart
+                        //   rect(<top> <right> <bottom> <left>) – backwards compatible syntax
+                        // only the same form values can be merged
+                        if (node.arguments.size < 4) {
+                            name = 'rect-backward';
+                        }
+                    }
+
+                    special[name + '()'] = true;
+
+                    // check nested tokens too
+                    node.arguments.each(walk);
+
+                    break;
+
+                case 'Dimension':
+                    var unit = node.unit;
+
+                    switch (unit) {
+                        // is not supported until IE11
+                        case 'rem':
+
+                        // v* units is too buggy across browsers and better
+                        // don't merge values with those units
+                        case 'vw':
+                        case 'vh':
+                        case 'vmin':
+                        case 'vmax':
+                        case 'vm': // IE9 supporting "vm" instead of "vmin".
+                            special[unit] = true;
+                            break;
+                    }
+                    break;
+            }
+        });
+
+        fingerprint = '|' + Object.keys(special).sort() + '|' + iehack + vendorId;
+
+        fingerprints[declarationId] = fingerprint;
+    }
+
+    return propertyName + fingerprint;
+}
+
+function needless(props, declaration, fingerprints) {
+    var property = resolveProperty(declaration.property.name);
+
+    if (NEEDLESS_TABLE.hasOwnProperty(property.name)) {
+        var table = NEEDLESS_TABLE[property.name];
+
+        for (var i = 0; i < table.length; i++) {
+            var ppre = getPropertyFingerprint(property.prefix + table[i], declaration, fingerprints);
+            var prev = props[ppre];
+
+            if (prev && (!declaration.value.important || prev.item.data.value.important)) {
+                return prev;
+            }
+        }
+    }
+}
+
+function processRuleset(ruleset, item, list, props, fingerprints) {
+    var declarations = ruleset.block.declarations;
+
+    declarations.eachRight(function(declaration, declarationItem) {
+        var property = declaration.property.name;
+        var fingerprint = getPropertyFingerprint(property, declaration, fingerprints);
+        var prev = props[fingerprint];
+
+        if (prev && !dontRestructure.hasOwnProperty(property)) {
+            if (declaration.value.important && !prev.item.data.value.important) {
+                props[fingerprint] = {
+                    block: declarations,
+                    item: declarationItem
+                };
+
+                prev.block.remove(prev.item);
+                declaration.info = {
+                    primary: declaration.info,
+                    merged: prev.item.data.info
+                };
+            } else {
+                declarations.remove(declarationItem);
+                prev.item.data.info = {
+                    primary: prev.item.data.info,
+                    merged: declaration.info
+                };
+            }
+        } else {
+            var prev = needless(props, declaration, fingerprints);
+
+            if (prev) {
+                declarations.remove(declarationItem);
+                prev.item.data.info = {
+                    primary: prev.item.data.info,
+                    merged: declaration.info
+                };
+            } else {
+                declaration.fingerprint = fingerprint;
+
+                props[fingerprint] = {
+                    block: declarations,
+                    item: declarationItem
+                };
+            }
+        }
+    });
+
+    if (declarations.isEmpty()) {
+        list.remove(item);
+    }
+};
+
+module.exports = function restructBlock(ast) {
+    var stylesheetMap = {};
+    var fingerprints = Object.create(null);
+
+    walkRulesRight(ast, function(node, item, list) {
+        if (node.type !== 'Ruleset') {
+            return;
+        }
+
+        var stylesheet = this.stylesheet;
+        var rulesetId = (node.pseudoSignature || '') + '|' + node.selector.selectors.first().id;
+        var rulesetMap;
+        var props;
+
+        if (!stylesheetMap.hasOwnProperty(stylesheet.id)) {
+            rulesetMap = {};
+            stylesheetMap[stylesheet.id] = rulesetMap;
+        } else {
+            rulesetMap = stylesheetMap[stylesheet.id];
+        }
+
+        if (rulesetMap.hasOwnProperty(rulesetId)) {
+            props = rulesetMap[rulesetId];
+        } else {
+            props = {};
+            rulesetMap[rulesetId] = props;
+        }
+
+        processRuleset.call(this, node, item, list, props, fingerprints);
+    });
+};
diff --git a/node_modules/csso/lib/compressor/restructure/7-mergeRuleset.js b/node_modules/csso/lib/compressor/restructure/7-mergeRuleset.js
new file mode 100644
index 00000000..0ae7edb6
--- /dev/null
+++ b/node_modules/csso/lib/compressor/restructure/7-mergeRuleset.js
@@ -0,0 +1,87 @@
+var utils = require('./utils.js');
+var walkRules = require('../../utils/walk.js').rules;
+
+/*
+    At this step all rules has single simple selector. We try to join by equal
+    declaration blocks to first rule, e.g.
+
+    .a { color: red }
+    b { ... }
+    .b { color: red }
+    ->
+    .a, .b { color: red }
+    b { ... }
+*/
+
+function processRuleset(node, item, list) {
+    var selectors = node.selector.selectors;
+    var declarations = node.block.declarations;
+    var nodeCompareMarker = selectors.first().compareMarker;
+    var skippedCompareMarkers = {};
+
+    list.nextUntil(item.next, function(next, nextItem) {
+        // skip non-ruleset node if safe
+        if (next.type !== 'Ruleset') {
+            return utils.unsafeToSkipNode.call(selectors, next);
+        }
+
+        if (node.pseudoSignature !== next.pseudoSignature) {
+            return true;
+        }
+
+        var nextFirstSelector = next.selector.selectors.head;
+        var nextDeclarations = next.block.declarations;
+        var nextCompareMarker = nextFirstSelector.data.compareMarker;
+
+        // if next ruleset has same marked as one of skipped then stop joining
+        if (nextCompareMarker in skippedCompareMarkers) {
+            return true;
+        }
+
+        // try to join by selectors
+        if (selectors.head === selectors.tail) {
+            if (selectors.first().id === nextFirstSelector.data.id) {
+                declarations.appendList(nextDeclarations);
+                list.remove(nextItem);
+                return;
+            }
+        }
+
+        // try to join by properties
+        if (utils.isEqualDeclarations(declarations, nextDeclarations)) {
+            var nextStr = nextFirstSelector.data.id;
+
+            selectors.some(function(data, item) {
+                var curStr = data.id;
+
+                if (nextStr < curStr) {
+                    selectors.insert(nextFirstSelector, item);
+                    return true;
+                }
+
+                if (!item.next) {
+                    selectors.insert(nextFirstSelector);
+                    return true;
+                }
+            });
+
+            list.remove(nextItem);
+            return;
+        }
+
+        // go to next ruleset if current one can be skipped (has no equal specificity nor element selector)
+        if (nextCompareMarker === nodeCompareMarker) {
+            return true;
+        }
+
+        skippedCompareMarkers[nextCompareMarker] = true;
+    });
+};
+
+module.exports = function mergeRuleset(ast) {
+    walkRules(ast, function(node, item, list) {
+        if (node.type === 'Ruleset') {
+            processRuleset(node, item, list);
+        }
+    });
+};
diff --git a/node_modules/csso/lib/compressor/restructure/8-restructRuleset.js b/node_modules/csso/lib/compressor/restructure/8-restructRuleset.js
new file mode 100644
index 00000000..9a9e545f
--- /dev/null
+++ b/node_modules/csso/lib/compressor/restructure/8-restructRuleset.js
@@ -0,0 +1,157 @@
+var List = require('../../utils/list.js');
+var utils = require('./utils.js');
+var walkRulesRight = require('../../utils/walk.js').rulesRight;
+
+function calcSelectorLength(list) {
+    var length = 0;
+
+    list.each(function(data) {
+        length += data.id.length + 1;
+    });
+
+    return length - 1;
+}
+
+function calcDeclarationsLength(tokens) {
+    var length = 0;
+
+    for (var i = 0; i < tokens.length; i++) {
+        length += tokens[i].length;
+    }
+
+    return (
+        length +          // declarations
+        tokens.length - 1 // delimeters
+    );
+}
+
+function processRuleset(node, item, list) {
+    var avoidRulesMerge = this.stylesheet.avoidRulesMerge;
+    var selectors = node.selector.selectors;
+    var block = node.block;
+    var disallowDownMarkers = Object.create(null);
+    var allowMergeUp = true;
+    var allowMergeDown = true;
+
+    list.prevUntil(item.prev, function(prev, prevItem) {
+        // skip non-ruleset node if safe
+        if (prev.type !== 'Ruleset') {
+            return utils.unsafeToSkipNode.call(selectors, prev);
+        }
+
+        var prevSelectors = prev.selector.selectors;
+        var prevBlock = prev.block;
+
+        if (node.pseudoSignature !== prev.pseudoSignature) {
+            return true;
+        }
+
+        allowMergeDown = !prevSelectors.some(function(selector) {
+            return selector.compareMarker in disallowDownMarkers;
+        });
+
+        // try prev ruleset if simpleselectors has no equal specifity and element selector
+        if (!allowMergeDown && !allowMergeUp) {
+            return true;
+        }
+
+        // try to join by selectors
+        if (allowMergeUp && utils.isEqualLists(prevSelectors, selectors)) {
+            prevBlock.declarations.appendList(block.declarations);
+            list.remove(item);
+            return true;
+        }
+
+        // try to join by properties
+        var diff = utils.compareDeclarations(block.declarations, prevBlock.declarations);
+
+        // console.log(diff.eq, diff.ne1, diff.ne2);
+
+        if (diff.eq.length) {
+            if (!diff.ne1.length && !diff.ne2.length) {
+                // equal blocks
+                if (allowMergeDown) {
+                    utils.addSelectors(selectors, prevSelectors);
+                    list.remove(prevItem);
+                }
+
+                return true;
+            } else if (!avoidRulesMerge) { /* probably we don't need to prevent those merges for @keyframes
+                                              TODO: need to be checked */
+
+                if (diff.ne1.length && !diff.ne2.length) {
+                    // prevBlock is subset block
+                    var selectorLength = calcSelectorLength(selectors);
+                    var blockLength = calcDeclarationsLength(diff.eq); // declarations length
+
+                    if (allowMergeUp && selectorLength < blockLength) {
+                        utils.addSelectors(prevSelectors, selectors);
+                        block.declarations = new List(diff.ne1);
+                    }
+                } else if (!diff.ne1.length && diff.ne2.length) {
+                    // node is subset of prevBlock
+                    var selectorLength = calcSelectorLength(prevSelectors);
+                    var blockLength = calcDeclarationsLength(diff.eq); // declarations length
+
+                    if (allowMergeDown && selectorLength < blockLength) {
+                        utils.addSelectors(selectors, prevSelectors);
+                        prevBlock.declarations = new List(diff.ne2);
+                    }
+                } else {
+                    // diff.ne1.length && diff.ne2.length
+                    // extract equal block
+                    var newSelector = {
+                        type: 'Selector',
+                        info: {},
+                        selectors: utils.addSelectors(prevSelectors.copy(), selectors)
+                    };
+                    var newBlockLength = calcSelectorLength(newSelector.selectors) + 2; // selectors length + curly braces length
+                    var blockLength = calcDeclarationsLength(diff.eq); // declarations length
+
+                    // create new ruleset if declarations length greater than
+                    // ruleset description overhead
+                    if (allowMergeDown && blockLength >= newBlockLength) {
+                        var newRuleset = {
+                            type: 'Ruleset',
+                            info: {},
+                            pseudoSignature: node.pseudoSignature,
+                            selector: newSelector,
+                            block: {
+                                type: 'Block',
+                                info: {},
+                                declarations: new List(diff.eq)
+                            }
+                        };
+
+                        block.declarations = new List(diff.ne1);
+                        prevBlock.declarations = new List(diff.ne2.concat(diff.ne2overrided));
+                        list.insert(list.createItem(newRuleset), prevItem);
+                        return true;
+                    }
+                }
+            }
+        }
+
+        if (allowMergeUp) {
+            // TODO: disallow up merge only if any property interception only (i.e. diff.ne2overrided.length > 0);
+            // await property families to find property interception correctly
+            allowMergeUp = !prevSelectors.some(function(prevSelector) {
+                return selectors.some(function(selector) {
+                    return selector.compareMarker === prevSelector.compareMarker;
+                });
+            });
+        }
+
+        prevSelectors.each(function(data) {
+            disallowDownMarkers[data.compareMarker] = true;
+        });
+    });
+};
+
+module.exports = function restructRuleset(ast) {
+    walkRulesRight(ast, function(node, item, list) {
+        if (node.type === 'Ruleset') {
+            processRuleset.call(this, node, item, list);
+        }
+    });
+};
diff --git a/node_modules/csso/lib/compressor/restructure/index.js b/node_modules/csso/lib/compressor/restructure/index.js
new file mode 100644
index 00000000..6a05974e
--- /dev/null
+++ b/node_modules/csso/lib/compressor/restructure/index.js
@@ -0,0 +1,35 @@
+var prepare = require('./prepare/index.js');
+var initialMergeRuleset = require('./1-initialMergeRuleset.js');
+var mergeAtrule = require('./2-mergeAtrule.js');
+var disjoinRuleset = require('./3-disjoinRuleset.js');
+var restructShorthand = require('./4-restructShorthand.js');
+var restructBlock = require('./6-restructBlock.js');
+var mergeRuleset = require('./7-mergeRuleset.js');
+var restructRuleset = require('./8-restructRuleset.js');
+
+module.exports = function(ast, usageData, debug) {
+    // prepare ast for restructing
+    var indexer = prepare(ast, usageData);
+    debug('prepare', ast);
+
+    initialMergeRuleset(ast);
+    debug('initialMergeRuleset', ast);
+
+    mergeAtrule(ast);
+    debug('mergeAtrule', ast);
+
+    disjoinRuleset(ast);
+    debug('disjoinRuleset', ast);
+
+    restructShorthand(ast, indexer);
+    debug('restructShorthand', ast);
+
+    restructBlock(ast);
+    debug('restructBlock', ast);
+
+    mergeRuleset(ast);
+    debug('mergeRuleset', ast);
+
+    restructRuleset(ast);
+    debug('restructRuleset', ast);
+};
diff --git a/node_modules/csso/lib/compressor/restructure/prepare/createDeclarationIndexer.js b/node_modules/csso/lib/compressor/restructure/prepare/createDeclarationIndexer.js
new file mode 100644
index 00000000..c5235309
--- /dev/null
+++ b/node_modules/csso/lib/compressor/restructure/prepare/createDeclarationIndexer.js
@@ -0,0 +1,32 @@
+var translate = require('../../../utils/translate.js');
+
+function Index() {
+    this.seed = 0;
+    this.map = Object.create(null);
+}
+
+Index.prototype.resolve = function(str) {
+    var index = this.map[str];
+
+    if (!index) {
+        index = ++this.seed;
+        this.map[str] = index;
+    }
+
+    return index;
+};
+
+module.exports = function createDeclarationIndexer() {
+    var names = new Index();
+    var values = new Index();
+
+    return function markDeclaration(node) {
+        var property = node.property.name;
+        var value = translate(node.value);
+
+        node.id = names.resolve(property) + (values.resolve(value) << 12);
+        node.length = property.length + 1 + value.length;
+
+        return node;
+    };
+};
diff --git a/node_modules/csso/lib/compressor/restructure/prepare/index.js b/node_modules/csso/lib/compressor/restructure/prepare/index.js
new file mode 100644
index 00000000..075dc5f1
--- /dev/null
+++ b/node_modules/csso/lib/compressor/restructure/prepare/index.js
@@ -0,0 +1,44 @@
+var resolveKeyword = require('../../../utils/names.js').keyword;
+var walkRules = require('../../../utils/walk.js').rules;
+var translate = require('../../../utils/translate.js');
+var createDeclarationIndexer = require('./createDeclarationIndexer.js');
+var processSelector = require('./processSelector.js');
+
+function walk(node, markDeclaration, usageData) {
+    switch (node.type) {
+        case 'Ruleset':
+            node.block.declarations.each(markDeclaration);
+            processSelector(node, usageData);
+            break;
+
+        case 'Atrule':
+            if (node.expression) {
+                node.expression.id = translate(node.expression);
+            }
+
+            // compare keyframe selectors by its values
+            // NOTE: still no clarification about problems with keyframes selector grouping (issue #197)
+            if (resolveKeyword(node.name).name === 'keyframes') {
+                node.block.avoidRulesMerge = true;  /* probably we don't need to prevent those merges for @keyframes
+                                                       TODO: need to be checked */
+                node.block.rules.each(function(ruleset) {
+                    ruleset.selector.selectors.each(function(simpleselector) {
+                        simpleselector.compareMarker = simpleselector.id;
+                    });
+                });
+            }
+            break;
+    }
+};
+
+module.exports = function prepare(ast, usageData) {
+    var markDeclaration = createDeclarationIndexer();
+
+    walkRules(ast, function(node) {
+        walk(node, markDeclaration, usageData);
+    });
+
+    return {
+        declaration: markDeclaration
+    };
+};
diff --git a/node_modules/csso/lib/compressor/restructure/prepare/processSelector.js b/node_modules/csso/lib/compressor/restructure/prepare/processSelector.js
new file mode 100644
index 00000000..56c46b56
--- /dev/null
+++ b/node_modules/csso/lib/compressor/restructure/prepare/processSelector.js
@@ -0,0 +1,99 @@
+var translate = require('../../../utils/translate.js');
+var specificity = require('./specificity.js');
+
+var nonFreezePseudoElements = {
+    'first-letter': true,
+    'first-line': true,
+    'after': true,
+    'before': true
+};
+var nonFreezePseudoClasses = {
+    'link': true,
+    'visited': true,
+    'hover': true,
+    'active': true,
+    'first-letter': true,
+    'first-line': true,
+    'after': true,
+    'before': true
+};
+
+module.exports = function freeze(node, usageData) {
+    var pseudos = Object.create(null);
+    var hasPseudo = false;
+
+    node.selector.selectors.each(function(simpleSelector) {
+        var tagName = '*';
+        var scope = 0;
+
+        simpleSelector.sequence.some(function(node) {
+            switch (node.type) {
+                case 'Class':
+                    if (usageData && usageData.scopes) {
+                        var classScope = usageData.scopes[node.name] || 0;
+
+                        if (scope !== 0 && classScope !== scope) {
+                            throw new Error('Selector can\'t has classes from different scopes: ' + translate(simpleSelector));
+                        }
+
+                        scope = classScope;
+                    }
+                    break;
+
+                case 'PseudoClass':
+                    if (!nonFreezePseudoClasses.hasOwnProperty(node.name)) {
+                        pseudos[node.name] = true;
+                        hasPseudo = true;
+                    }
+                    break;
+
+                case 'PseudoElement':
+                    if (!nonFreezePseudoElements.hasOwnProperty(node.name)) {
+                        pseudos[node.name] = true;
+                        hasPseudo = true;
+                    }
+                    break;
+
+                case 'FunctionalPseudo':
+                    pseudos[node.name] = true;
+                    hasPseudo = true;
+                    break;
+
+                case 'Negation':
+                    pseudos.not = true;
+                    hasPseudo = true;
+                    break;
+
+                case 'Identifier':
+                    tagName = node.name;
+                    break;
+
+                case 'Attribute':
+                    if (node.flags) {
+                        pseudos['[' + node.flags + ']'] = true;
+                        hasPseudo = true;
+                    }
+                    break;
+
+                case 'Combinator':
+                    tagName = '*';
+                    break;
+            }
+        });
+
+        simpleSelector.id = translate(simpleSelector);
+        simpleSelector.compareMarker = specificity(simpleSelector).toString();
+
+        if (scope) {
+            simpleSelector.compareMarker += ':' + scope;
+        }
+
+        if (tagName !== '*') {
+            simpleSelector.compareMarker += ',' + tagName;
+        }
+    });
+
+    if (hasPseudo) {
+        node.pseudoSignature = Object.keys(pseudos).sort().join(',');
+    }
+};
diff --git a/node_modules/csso/lib/compressor/restructure/prepare/specificity.js b/node_modules/csso/lib/compressor/restructure/prepare/specificity.js
new file mode 100644
index 00000000..506c3373
--- /dev/null
+++ b/node_modules/csso/lib/compressor/restructure/prepare/specificity.js
@@ -0,0 +1,48 @@
+module.exports = function specificity(simpleSelector) {
+    var A = 0;
+    var B = 0;
+    var C = 0;
+
+    simpleSelector.sequence.each(function walk(data) {
+        switch (data.type) {
+            case 'SimpleSelector':
+            case 'Negation':
+                data.sequence.each(walk);
+                break;
+
+            case 'Id':
+                A++;
+                break;
+
+            case 'Class':
+            case 'Attribute':
+            case 'FunctionalPseudo':
+                B++;
+                break;
+
+            case 'Identifier':
+                if (data.name !== '*') {
+                    C++;
+                }
+                break;
+
+            case 'PseudoElement':
+                C++;
+                break;
+
+            case 'PseudoClass':
+                var name = data.name.toLowerCase();
+                if (name === 'before' ||
+                    name === 'after' ||
+                    name === 'first-line' ||
+                    name === 'first-letter') {
+                    C++;
+                } else {
+                    B++;
+                }
+                break;
+        }
+    });
+
+    return [A, B, C];
+};
diff --git a/node_modules/csso/lib/compressor/restructure/utils.js b/node_modules/csso/lib/compressor/restructure/utils.js
new file mode 100644
index 00000000..70c92c51
--- /dev/null
+++ b/node_modules/csso/lib/compressor/restructure/utils.js
@@ -0,0 +1,141 @@
+var hasOwnProperty = Object.prototype.hasOwnProperty;
+
+function isEqualLists(a, b) {
+    var cursor1 = a.head;
+    var cursor2 = b.head;
+
+    while (cursor1 !== null && cursor2 !== null && cursor1.data.id === cursor2.data.id) {
+        cursor1 = cursor1.next;
+        cursor2 = cursor2.next;
+    }
+
+    return cursor1 === null && cursor2 === null;
+}
+
+function isEqualDeclarations(a, b) {
+    var cursor1 = a.head;
+    var cursor2 = b.head;
+
+    while (cursor1 !== null && cursor2 !== null && cursor1.data.id === cursor2.data.id) {
+        cursor1 = cursor1.next;
+        cursor2 = cursor2.next;
+    }
+
+    return cursor1 === null && cursor2 === null;
+}
+
+function compareDeclarations(declarations1, declarations2) {
+    var result = {
+        eq: [],
+        ne1: [],
+        ne2: [],
+        ne2overrided: []
+    };
+
+    var fingerprints = Object.create(null);
+    var declarations2hash = Object.create(null);
+
+    for (var cursor = declarations2.head; cursor; cursor = cursor.next)  {
+        declarations2hash[cursor.data.id] = true;
+    }
+
+    for (var cursor = declarations1.head; cursor; cursor = cursor.next)  {
+        var data = cursor.data;
+
+        if (data.fingerprint) {
+            fingerprints[data.fingerprint] = data.value.important;
+        }
+
+        if (declarations2hash[data.id]) {
+            declarations2hash[data.id] = false;
+            result.eq.push(data);
+        } else {
+            result.ne1.push(data);
+        }
+    }
+
+    for (var cursor = declarations2.head; cursor; cursor = cursor.next)  {
+        var data = cursor.data;
+
+        if (declarations2hash[data.id]) {
+            // if declarations1 has overriding declaration, this is not a difference
+            // but take in account !important - prev should be equal or greater than follow
+            if (hasOwnProperty.call(fingerprints, data.fingerprint) &&
+                Number(fingerprints[data.fingerprint]) >= Number(data.value.important)) {
+                result.ne2overrided.push(data);
+            } else {
+                result.ne2.push(data);
+            }
+        }
+    }
+
+    return result;
+}
+
+function addSelectors(dest, source) {
+    source.each(function(sourceData) {
+        var newStr = sourceData.id;
+        var cursor = dest.head;
+
+        while (cursor) {
+            var nextStr = cursor.data.id;
+
+            if (nextStr === newStr) {
+                return;
+            }
+
+            if (nextStr > newStr) {
+                break;
+            }
+
+            cursor = cursor.next;
+        }
+
+        dest.insert(dest.createItem(sourceData), cursor);
+    });
+
+    return dest;
+}
+
+// check if simpleselectors has no equal specificity and element selector
+function hasSimilarSelectors(selectors1, selectors2) {
+    return selectors1.some(function(a) {
+        return selectors2.some(function(b) {
+            return a.compareMarker === b.compareMarker;
+        });
+    });
+}
+
+// test node can't to be skipped
+function unsafeToSkipNode(node) {
+    switch (node.type) {
+        case 'Ruleset':
+            // unsafe skip ruleset with selector similarities
+            return hasSimilarSelectors(node.selector.selectors, this);
+
+        case 'Atrule':
+            // can skip at-rules with blocks
+            if (node.block) {
+                // non-stylesheet blocks are safe to skip since have no selectors
+                if (node.block.type !== 'StyleSheet') {
+                    return false;
+                }
+
+                // unsafe skip at-rule if block contains something unsafe to skip
+                return node.block.rules.some(unsafeToSkipNode, this);
+            }
+            break;
+    }
+
+    // unsafe by default
+    return true;
+}
+
+module.exports = {
+    isEqualLists: isEqualLists,
+    isEqualDeclarations: isEqualDeclarations,
+    compareDeclarations: compareDeclarations,
+    addSelectors: addSelectors,
+    hasSimilarSelectors: hasSimilarSelectors,
+    unsafeToSkipNode: unsafeToSkipNode
+};
diff --git a/node_modules/csso/lib/compressor/usage.js b/node_modules/csso/lib/compressor/usage.js
new file mode 100644
index 00000000..72d8b15b
--- /dev/null
+++ b/node_modules/csso/lib/compressor/usage.js
@@ -0,0 +1,58 @@
+var hasOwnProperty = Object.prototype.hasOwnProperty;
+
+function buildMap(list, caseInsensitive) {
+    var map = Object.create(null);
+
+    if (!Array.isArray(list)) {
+        return false;
+    }
+
+    for (var i = 0; i < list.length; i++) {
+        var name = list[i];
+
+        if (caseInsensitive) {
+            name = name.toLowerCase();
+        }
+
+        map[name] = true;
+    }
+
+    return map;
+}
+
+function buildIndex(data) {
+    var scopes = false;
+
+    if (data.scopes && Array.isArray(data.scopes)) {
+        scopes = Object.create(null);
+
+        for (var i = 0; i < data.scopes.length; i++) {
+            var list = data.scopes[i];
+
+            if (!list || !Array.isArray(list)) {
+                throw new Error('Wrong usage format');
+            }
+
+            for (var j = 0; j < list.length; j++) {
+                var name = list[j];
+
+                if (hasOwnProperty.call(scopes, name)) {
+                    throw new Error('Class can\'t be used for several scopes: ' + name);
+                }
+
+                scopes[name] = i + 1;
+            }
+        }
+    }
+
+    return {
+        tags: buildMap(data.tags, true),
+        ids: buildMap(data.ids),
+        classes: buildMap(data.classes),
+        scopes: scopes
+    };
+}
+
+module.exports = {
+    buildIndex: buildIndex
+};
diff --git a/node_modules/csso/lib/index.js b/node_modules/csso/lib/index.js
new file mode 100644
index 00000000..e2620280
--- /dev/null
+++ b/node_modules/csso/lib/index.js
@@ -0,0 +1,156 @@
+var parse = require('./parser');
+var compress = require('./compressor');
+var translate = require('./utils/translate');
+var translateWithSourceMap = require('./utils/translateWithSourceMap');
+var walkers = require('./utils/walk');
+var clone = require('./utils/clone');
+var List = require('./utils/list');
+
+function debugOutput(name, options, startTime, data) {
+    if (options.debug) {
+        console.error('## ' + name + ' done in %d ms\n', Date.now() - startTime);
+    }
+
+    return data;
+}
+
+function createDefaultLogger(level) {
+    var lastDebug;
+
+    return function logger(title, ast) {
+        var line = title;
+
+        if (ast) {
+            line = '[' + ((Date.now() - lastDebug) / 1000).toFixed(3) + 's] ' + line;
+        }
+
+        if (level > 1 && ast) {
+            var css = translate(ast, true);
+
+            // when level 2, limit css to 256 symbols
+            if (level === 2 && css.length > 256) {
+                css = css.substr(0, 256) + '...';
+            }
+
+            line += '\n  ' + css + '\n';
+        }
+
+        console.error(line);
+        lastDebug = Date.now();
+    };
+}
+
+function copy(obj) {
+    var result = {};
+
+    for (var key in obj) {
+        result[key] = obj[key];
+    }
+
+    return result;
+}
+
+function buildCompressOptions(options) {
+    options = copy(options);
+
+    if (typeof options.logger !== 'function' && options.debug) {
+        options.logger = createDefaultLogger(options.debug);
+    }
+
+    return options;
+}
+
+function runHandler(ast, options, handlers) {
+    if (!Array.isArray(handlers)) {
+        handlers = [handlers];
+    }
+
+    handlers.forEach(function(fn) {
+        fn(ast, options);
+    });
+}
+
+function minify(context, source, options) {
+    options = options || {};
+
+    var filename = options.filename || '<unknown>';
+    var result;
+
+    // parse
+    var ast = debugOutput('parsing', options, Date.now(),
+        parse(source, {
+            context: context,
+            filename: filename,
+            positions: Boolean(options.sourceMap)
+        })
+    );
+
+    // before compress handlers
+    if (options.beforeCompress) {
+        debugOutput('beforeCompress', options, Date.now(),
+            runHandler(ast, options, options.beforeCompress)
+        );
+    }
+
+    // compress
+    var compressResult = debugOutput('compress', options, Date.now(),
+        compress(ast, buildCompressOptions(options))
+    );
+
+    // after compress handlers
+    if (options.afterCompress) {
+        debugOutput('afterCompress', options, Date.now(),
+            runHandler(compressResult, options, options.afterCompress)
+        );
+    }
+
+    // translate
+    if (options.sourceMap) {
+        result = debugOutput('translateWithSourceMap', options, Date.now(), (function() {
+            var tmp = translateWithSourceMap(compressResult.ast);
+            tmp.map._file = filename; // since other tools can relay on file in source map transform chain
+            tmp.map.setSourceContent(filename, source);
+            return tmp;
+        })());
+    } else {
+        result = debugOutput('translate', options, Date.now(), {
+            css: translate(compressResult.ast),
+            map: null
+        });
+    }
+
+    return result;
+}
+
+function minifyStylesheet(source, options) {
+    return minify('stylesheet', source, options);
+};
+
+function minifyBlock(source, options) {
+    return minify('block', source, options);
+}
+
+module.exports = {
+    version: require('../package.json').version,
+
+    // classes
+    List: List,
+
+    // main methods
+    minify: minifyStylesheet,
+    minifyBlock: minifyBlock,
+
+    // step by step
+    parse: parse,
+    compress: compress,
+    translate: translate,
+    translateWithSourceMap: translateWithSourceMap,
+
+    // walkers
+    walk: walkers.all,
+    walkRules: walkers.rules,
+    walkRulesRight: walkers.rulesRight,
+
+    // utils
+    clone: clone
+};
diff --git a/node_modules/csso/lib/parser/const.js b/node_modules/csso/lib/parser/const.js
new file mode 100644
index 00000000..4c2d4000
--- /dev/null
+++ b/node_modules/csso/lib/parser/const.js
@@ -0,0 +1,46 @@
+exports.TokenType = {
+    String: 'String',
+    Comment: 'Comment',
+    Unknown: 'Unknown',
+    Newline: 'Newline',
+    Space: 'Space',
+    Tab: 'Tab',
+    ExclamationMark: 'ExclamationMark',         // !
+    QuotationMark: 'QuotationMark',             // "
+    NumberSign: 'NumberSign',                   // #
+    DollarSign: 'DollarSign',                   // $
+    PercentSign: 'PercentSign',                 // %
+    Ampersand: 'Ampersand',                     // &
+    Apostrophe: 'Apostrophe',                   // '
+    LeftParenthesis: 'LeftParenthesis',         // (
+    RightParenthesis: 'RightParenthesis',       // )
+    Asterisk: 'Asterisk',                       // *
+    PlusSign: 'PlusSign',                       // +
+    Comma: 'Comma',                             // ,
+    HyphenMinus: 'HyphenMinus',                 // -
+    FullStop: 'FullStop',                       // .
+    Solidus: 'Solidus',                         // /
+    Colon: 'Colon',                             // :
+    Semicolon: 'Semicolon',                     // ;
+    LessThanSign: 'LessThanSign',               // <
+    EqualsSign: 'EqualsSign',                   // =
+    GreaterThanSign: 'GreaterThanSign',         // >
+    QuestionMark: 'QuestionMark',               // ?
+    CommercialAt: 'CommercialAt',               // @
+    LeftSquareBracket: 'LeftSquareBracket',     // [
+    ReverseSolidus: 'ReverseSolidus',           // \
+    RightSquareBracket: 'RightSquareBracket',   // ]
+    CircumflexAccent: 'CircumflexAccent',       // ^
+    LowLine: 'LowLine',                         // _
+    LeftCurlyBracket: 'LeftCurlyBracket',       // {
+    VerticalLine: 'VerticalLine',               // |
+    RightCurlyBracket: 'RightCurlyBracket',     // }
+    Tilde: 'Tilde',                             // ~
+    Identifier: 'Identifier',
+    DecimalNumber: 'DecimalNumber'
+};
+
+// var i = 1;
+// for (var key in exports.TokenType) {
+//     exports.TokenType[key] = i++;
+// }
diff --git a/node_modules/csso/lib/parser/index.js b/node_modules/csso/lib/parser/index.js
new file mode 100644
index 00000000..9157decf
--- /dev/null
+++ b/node_modules/csso/lib/parser/index.js
@@ -0,0 +1,1870 @@
+'use strict';
+
+var TokenType = require('./const').TokenType;
+var Scanner = require('./scanner');
+var List = require('../utils/list');
+var needPositions;
+var filename;
+var scanner;
+
+var SCOPE_ATRULE_EXPRESSION = 1;
+var SCOPE_SELECTOR = 2;
+var SCOPE_VALUE = 3;
+
+var specialFunctions = {};
+specialFunctions[SCOPE_ATRULE_EXPRESSION] = {
+    url: getUri
+};
+specialFunctions[SCOPE_SELECTOR] = {
+    url: getUri,
+    not: getNotFunction
+};
+specialFunctions[SCOPE_VALUE] = {
+    url: getUri,
+    expression: getOldIEExpression,
+    var: getVarFunction
+};
+
+var initialContext = {
+    stylesheet: getStylesheet,
+    atrule: getAtrule,
+    atruleExpression: getAtruleExpression,
+    ruleset: getRuleset,
+    selector: getSelector,
+    simpleSelector: getSimpleSelector,
+    block: getBlock,
+    declaration: getDeclaration,
+    value: getValue
+};
+
+var blockMode = {
+    'declaration': true,
+    'property': true
+};
+
+function parseError(message) {
+    var error = new Error(message);
+    var offset = 0;
+    var line = 1;
+    var column = 1;
+    var lines;
+
+    if (scanner.token !== null) {
+        offset = scanner.token.offset;
+        line = scanner.token.line;
+        column = scanner.token.column;
+    } else if (scanner.prevToken !== null) {
+        lines = scanner.prevToken.value.trimRight();
+        offset = scanner.prevToken.offset + lines.length;
+        lines = lines.split(/\n|\r\n?|\f/);
+        line = scanner.prevToken.line + lines.length - 1;
+        column = lines.length > 1
+            ? lines[lines.length - 1].length + 1
+            : scanner.prevToken.column + lines[lines.length - 1].length;
+    }
+
+    error.name = 'CssSyntaxError';
+    error.parseError = {
+        offset: offset,
+        line: line,
+        column: column
+    };
+
+    throw error;
+}
+
+function eat(tokenType) {
+    if (scanner.token !== null && scanner.token.type === tokenType) {
+        scanner.next();
+        return true;
+    }
+
+    parseError(tokenType + ' is expected');
+}
+
+function expectIdentifier(name, eat) {
+    if (scanner.token !== null) {
+        if (scanner.token.type === TokenType.Identifier &&
+            scanner.token.value.toLowerCase() === name) {
+            if (eat) {
+                scanner.next();
+            }
+
+            return true;
+        }
+    }
+
+    parseError('Identifier `' + name + '` is expected');
+}
+
+function expectAny(what) {
+    if (scanner.token !== null) {
+        for (var i = 1, type = scanner.token.type; i < arguments.length; i++) {
+            if (type === arguments[i]) {
+                return true;
+            }
+        }
+    }
+
+    parseError(what + ' is expected');
+}
+
+function getInfo() {
+    if (needPositions && scanner.token) {
+        return {
+            source: filename,
+            offset: scanner.token.offset,
+            line: scanner.token.line,
+            column: scanner.token.column
+        };
+    }
+
+    return null;
+
+}
+
+function removeTrailingSpaces(list) {
+    while (list.tail) {
+        if (list.tail.data.type === 'Space') {
+            list.remove(list.tail);
+        } else {
+            break;
+        }
+    }
+}
+
+function getStylesheet(nested) {
+    var child = null;
+    var node = {
+        type: 'StyleSheet',
+        info: getInfo(),
+        rules: new List()
+    };
+
+    scan:
+    while (scanner.token !== null) {
+        switch (scanner.token.type) {
+            case TokenType.Space:
+                scanner.next();
+                child = null;
+                break;
+
+            case TokenType.Comment:
+                // ignore comments except exclamation comments on top level
+                if (nested || scanner.token.value.charAt(2) !== '!') {
+                    scanner.next();
+                    child = null;
+                } else {
+                    child = getComment();
+                }
+                break;
+
+            case TokenType.Unknown:
+                child = getUnknown();
+                break;
+
+            case TokenType.CommercialAt:
+                child = getAtrule();
+                break;
+
+            case TokenType.RightCurlyBracket:
+                if (!nested) {
+                    parseError('Unexpected right curly brace');
+                }
+
+                break scan;
+
+            default:
+                child = getRuleset();
+        }
+
+        if (child !== null) {
+            node.rules.insert(List.createItem(child));
+        }
+    }
+
+    return node;
+}
+
+// '//' ...
+// TODO: remove it as wrong thing
+function getUnknown() {
+    var info = getInfo();
+    var value = scanner.token.value;
+
+    eat(TokenType.Unknown);
+
+    return {
+        type: 'Unknown',
+        info: info,
+        value: value
+    };
+}
+
+function isBlockAtrule() {
+    for (var offset = 1, cursor; cursor = scanner.lookup(offset); offset++) {
+        var type = cursor.type;
+
+        if (type === TokenType.RightCurlyBracket) {
+            return true;
+        }
+
+        if (type === TokenType.LeftCurlyBracket ||
+            type === TokenType.CommercialAt) {
+            return false;
+        }
+    }
+
+    return true;
+}
+
+function getAtruleExpression() {
+    var child = null;
+    var node = {
+        type: 'AtruleExpression',
+        info: getInfo(),
+        sequence: new List()
+    };
+
+    scan:
+    while (scanner.token !== null) {
+        switch (scanner.token.type) {
+            case TokenType.Semicolon:
+                break scan;
+
+            case TokenType.LeftCurlyBracket:
+                break scan;
+
+            case TokenType.Space:
+                if (node.sequence.isEmpty()) {
+                    scanner.next(); // ignore spaces in beginning
+                    child = null;
+                } else {
+                    child = getS();
+                }
+                break;
+
+            case TokenType.Comment: // ignore comments
+                scanner.next();
+                child = null;
+                break;
+
+            case TokenType.Comma:
+                child = getOperator();
+                break;
+
+            case TokenType.Colon:
+                child = getPseudo();
+                break;
+
+            case TokenType.LeftParenthesis:
+                child = getBraces(SCOPE_ATRULE_EXPRESSION);
+                break;
+
+            default:
+                child = getAny(SCOPE_ATRULE_EXPRESSION);
+        }
+
+        if (child !== null) {
+            node.sequence.insert(List.createItem(child));
+        }
+    }
+
+    removeTrailingSpaces(node.sequence);
+
+    return node;
+}
+
+function getAtrule() {
+    eat(TokenType.CommercialAt);
+
+    var node = {
+        type: 'Atrule',
+        info: getInfo(),
+        name: readIdent(false),
+        expression: getAtruleExpression(),
+        block: null
+    };
+
+    if (scanner.token !== null) {
+        switch (scanner.token.type) {
+            case TokenType.Semicolon:
+                scanner.next();  // {
+                break;
+
+            case TokenType.LeftCurlyBracket:
+                scanner.next();  // {
+
+                if (isBlockAtrule()) {
+                    node.block = getBlock();
+                } else {
+                    node.block = getStylesheet(true);
+                }
+
+                eat(TokenType.RightCurlyBracket);
+                break;
+
+            default:
+                parseError('Unexpected input');
+        }
+    }
+
+    return node;
+}
+
+function getRuleset() {
+    return {
+        type: 'Ruleset',
+        info: getInfo(),
+        selector: getSelector(),
+        block: getBlockWithBrackets()
+    };
+}
+
+function getSelector() {
+    var isBadSelector = false;
+    var lastComma = true;
+    var node = {
+        type: 'Selector',
+        info: getInfo(),
+        selectors: new List()
+    };
+
+    scan:
+    while (scanner.token !== null) {
+        switch (scanner.token.type) {
+            case TokenType.LeftCurlyBracket:
+                break scan;
+
+            case TokenType.Comma:
+                if (lastComma) {
+                    isBadSelector = true;
+                }
+
+                lastComma = true;
+                scanner.next();
+                break;
+
+            default:
+                if (!lastComma) {
+                    isBadSelector = true;
+                }
+
+                lastComma = false;
+                node.selectors.insert(List.createItem(getSimpleSelector()));
+
+                if (node.selectors.tail.data.sequence.isEmpty()) {
+                    isBadSelector = true;
+                }
+        }
+    }
+
+    if (lastComma) {
+        isBadSelector = true;
+        // parseError('Unexpected trailing comma');
+    }
+
+    if (isBadSelector) {
+        node.selectors = new List();
+    }
+
+    return node;
+}
+
+function getSimpleSelector(nested) {
+    var child = null;
+    var combinator = null;
+    var node = {
+        type: 'SimpleSelector',
+        info: getInfo(),
+        sequence: new List()
+    };
+
+    scan:
+    while (scanner.token !== null) {
+        switch (scanner.token.type) {
+            case TokenType.Comma:
+                break scan;
+
+            case TokenType.LeftCurlyBracket:
+                if (nested) {
+                    parseError('Unexpected input');
+                }
+
+                break scan;
+
+            case TokenType.RightParenthesis:
+                if (!nested) {
+                    parseError('Unexpected input');
+                }
+
+                break scan;
+
+            case TokenType.Comment:
+                scanner.next();
+                child = null;
+                break;
+
+            case TokenType.Space:
+                child = null;
+                if (!combinator && node.sequence.head) {
+                    combinator = getCombinator();
+                } else {
+                    scanner.next();
+                }
+                break;
+
+            case TokenType.PlusSign:
+            case TokenType.GreaterThanSign:
+            case TokenType.Tilde:
+            case TokenType.Solidus:
+                if (combinator && combinator.name !== ' ') {
+                    parseError('Unexpected combinator');
+                }
+
+                child = null;
+                combinator = getCombinator();
+                break;
+
+            case TokenType.FullStop:
+                child = getClass();
+                break;
+
+            case TokenType.LeftSquareBracket:
+                child = getAttribute();
+                break;
+
+            case TokenType.NumberSign:
+                child = getShash();
+                break;
+
+            case TokenType.Colon:
+                child = getPseudo();
+                break;
+
+            case TokenType.LowLine:
+            case TokenType.Identifier:
+            case TokenType.Asterisk:
+                child = getNamespacedIdentifier(false);
+                break;
+
+            case TokenType.HyphenMinus:
+            case TokenType.DecimalNumber:
+                child = tryGetPercentage() || getNamespacedIdentifier(false);
+                break;
+
+            default:
+                parseError('Unexpected input');
+        }
+
+        if (child !== null) {
+            if (combinator !== null) {
+                node.sequence.insert(List.createItem(combinator));
+                combinator = null;
+            }
+
+            node.sequence.insert(List.createItem(child));
+        }
+    }
+
+    if (combinator && combinator.name !== ' ') {
+        parseError('Unexpected combinator');
+    }
+
+    return node;
+}
+
+function getDeclarations() {
+    var child = null;
+    var declarations = new List();
+
+    scan:
+    while (scanner.token !== null) {
+        switch (scanner.token.type) {
+            case TokenType.RightCurlyBracket:
+                break scan;
+
+            case TokenType.Space:
+            case TokenType.Comment:
+                scanner.next();
+                child = null;
+                break;
+
+            case TokenType.Semicolon: // ;
+                scanner.next();
+                child = null;
+                break;
+
+            default:
+                child = getDeclaration();
+        }
+
+        if (child !== null) {
+            declarations.insert(List.createItem(child));
+        }
+    }
+
+    return declarations;
+}
+
+function getBlockWithBrackets() {
+    var info = getInfo();
+    var node;
+
+    eat(TokenType.LeftCurlyBracket);
+    node = {
+        type: 'Block',
+        info: info,
+        declarations: getDeclarations()
+    };
+    eat(TokenType.RightCurlyBracket);
+
+    return node;
+}
+
+function getBlock() {
+    return {
+        type: 'Block',
+        info: getInfo(),
+        declarations: getDeclarations()
+    };
+}
+
+function getDeclaration(nested) {
+    var info = getInfo();
+    var property = getProperty();
+    var value;
+
+    eat(TokenType.Colon);
+
+    // check it's a filter
+    if (/filter$/.test(property.name.toLowerCase()) && checkProgid()) {
+        value = getFilterValue();
+    } else {
+        value = getValue(nested);
+    }
+
+    return {
+        type: 'Declaration',
+        info: info,
+        property: property,
+        value: value
+    };
+}
+
+function getProperty() {
+    var name = '';
+    var node = {
+        type: 'Property',
+        info: getInfo(),
+        name: null
+    };
+
+    for (; scanner.token !== null; scanner.next()) {
+        var type = scanner.token.type;
+
+        if (type !== TokenType.Solidus &&
+            type !== TokenType.Asterisk &&
+            type !== TokenType.DollarSign) {
+            break;
+        }
+
+        name += scanner.token.value;
+    }
+
+    node.name = name + readIdent(true);
+
+    readSC();
+
+    return node;
+}
+
+function getValue(nested) {
+    var child = null;
+    var node = {
+        type: 'Value',
+        info: getInfo(),
+        important: false,
+        sequence: new List()
+    };
+
+    readSC();
+
+    scan:
+    while (scanner.token !== null) {
+        switch (scanner.token.type) {
+            case TokenType.RightCurlyBracket:
+            case TokenType.Semicolon:
+                break scan;
+
+            case TokenType.RightParenthesis:
+                if (!nested) {
+                    parseError('Unexpected input');
+                }
+                break scan;
+
+            case TokenType.Space:
+                child = getS();
+                break;
+
+            case TokenType.Comment: // ignore comments
+                scanner.next();
+                child = null;
+                break;
+
+            case TokenType.NumberSign:
+                child = getVhash();
+                break;
+
+            case TokenType.Solidus:
+            case TokenType.Comma:
+                child = getOperator();
+                break;
+
+            case TokenType.LeftParenthesis:
+            case TokenType.LeftSquareBracket:
+                child = getBraces(SCOPE_VALUE);
+                break;
+
+            case TokenType.ExclamationMark:
+                node.important = getImportant();
+                child = null;
+                break;
+
+            default:
+                // check for unicode range: U+0F00, U+0F00-0FFF, u+0F00??
+                if (scanner.token.type === TokenType.Identifier) {
+                    var prefix = scanner.token.value;
+                    if (prefix === 'U' || prefix === 'u') {
+                        if (scanner.lookupType(1, TokenType.PlusSign)) {
+                            scanner.next(); // U or u
+                            scanner.next(); // +
+
+                            child = {
+                                type: 'Identifier',
+                                info: getInfo(), // FIXME: wrong position
+                                name: prefix + '+' + readUnicodeRange(true)
+                            };
+                            break;
+                        }
+                    }
+                }
+
+                child = getAny(SCOPE_VALUE);
+        }
+
+        if (child !== null) {
+            node.sequence.insert(List.createItem(child));
+        }
+    }
+
+    removeTrailingSpaces(node.sequence);
+
+    return node;
+}
+
+// any = string | percentage | dimension | number | uri | functionExpression | funktion | unary | operator | ident
+function getAny(scope) {
+    switch (scanner.token.type) {
+        case TokenType.String:
+            return getString();
+
+        case TokenType.LowLine:
+        case TokenType.Identifier:
+            break;
+
+        case TokenType.FullStop:
+        case TokenType.DecimalNumber:
+        case TokenType.HyphenMinus:
+        case TokenType.PlusSign:
+            var number = tryGetNumber();
+
+            if (number !== null) {
+                if (scanner.token !== null) {
+                    if (scanner.token.type === TokenType.PercentSign) {
+                        return getPercentage(number);
+                    } else if (scanner.token.type === TokenType.Identifier) {
+                        return getDimension(number.value);
+                    }
+                }
+
+                return number;
+            }
+
+            if (scanner.token.type === TokenType.HyphenMinus) {
+                var next = scanner.lookup(1);
+                if (next && (next.type === TokenType.Identifier || next.type === TokenType.HyphenMinus)) {
+                    break;
+                }
+            }
+
+            if (scanner.token.type === TokenType.HyphenMinus ||
+                scanner.token.type === TokenType.PlusSign) {
+                return getOperator();
+            }
+
+            parseError('Unexpected input');
+
+        default:
+            parseError('Unexpected input');
+    }
+
+    var ident = getIdentifier(false);
+
+    if (scanner.token !== null && scanner.token.type === TokenType.LeftParenthesis) {
+        return getFunction(scope, ident);
+    }
+
+    return ident;
+}
+
+function readAttrselector() {
+    expectAny('Attribute selector (=, ~=, ^=, $=, *=, |=)',
+        TokenType.EqualsSign,        // =
+        TokenType.Tilde,             // ~=
+        TokenType.CircumflexAccent,  // ^=
+        TokenType.DollarSign,        // $=
+        TokenType.Asterisk,          // *=
+        TokenType.VerticalLine       // |=
+    );
+
+    var name;
+
+    if (scanner.token.type === TokenType.EqualsSign) {
+        name = '=';
+        scanner.next();
+    } else {
+        name = scanner.token.value + '=';
+        scanner.next();
+        eat(TokenType.EqualsSign);
+    }
+
+    return name;
+}
+
+// '[' S* attrib_name ']'
+// '[' S* attrib_name S* attrib_match S* [ IDENT | STRING ] S* attrib_flags? S* ']'
+function getAttribute() {
+    var node = {
+        type: 'Attribute',
+        info: getInfo(),
+        name: null,
+        operator: null,
+        value: null,
+        flags: null
+    };
+
+    eat(TokenType.LeftSquareBracket);
+
+    readSC();
+
+    node.name = getNamespacedIdentifier(true);
+
+    readSC();
+
+    if (scanner.token !== null && scanner.token.type !== TokenType.RightSquareBracket) {
+        // avoid case `[name i]`
+        if (scanner.token.type !== TokenType.Identifier) {
+            node.operator = readAttrselector();
+
+            readSC();
+
+            if (scanner.token !== null && scanner.token.type === TokenType.String) {
+                node.value = getString();
+            } else {
+                node.value = getIdentifier(false);
+            }
+
+            readSC();
+        }
+
+        // attribute flags
+        if (scanner.token !== null && scanner.token.type === TokenType.Identifier) {
+            node.flags = scanner.token.value;
+
+            scanner.next();
+            readSC();
+        }
+    }
+
+    eat(TokenType.RightSquareBracket);
+
+    return node;
+}
+
+function getBraces(scope) {
+    var close;
+    var child = null;
+    var node = {
+        type: 'Braces',
+        info: getInfo(),
+        open: scanner.token.value,
+        close: null,
+        sequence: new List()
+    };
+
+    if (scanner.token.type === TokenType.LeftParenthesis) {
+        close = TokenType.RightParenthesis;
+    } else {
+        close = TokenType.RightSquareBracket;
+    }
+
+    // left brace
+    scanner.next();
+
+    readSC();
+
+    scan:
+    while (scanner.token !== null) {
+        switch (scanner.token.type) {
+            case close:
+                node.close = scanner.token.value;
+                break scan;
+
+            case TokenType.Space:
+                child = getS();
+                break;
+
+            case TokenType.Comment:
+                scanner.next();
+                child = null;
+                break;
+
+            case TokenType.NumberSign: // ??
+                child = getVhash();
+                break;
+
+            case TokenType.LeftParenthesis:
+            case TokenType.LeftSquareBracket:
+                child = getBraces(scope);
+                break;
+
+            case TokenType.Solidus:
+            case TokenType.Asterisk:
+            case TokenType.Comma:
+            case TokenType.Colon:
+                child = getOperator();
+                break;
+
+            default:
+                child = getAny(scope);
+        }
+
+        if (child !== null) {
+            node.sequence.insert(List.createItem(child));
+        }
+    }
+
+    removeTrailingSpaces(node.sequence);
+
+    // right brace
+    eat(close);
+
+    return node;
+}
+
+// '.' ident
+function getClass() {
+    var info = getInfo();
+
+    eat(TokenType.FullStop);
+
+    return {
+        type: 'Class',
+        info: info,
+        name: readIdent(false)
+    };
+}
+
+// '#' ident
+function getShash() {
+    var info = getInfo();
+
+    eat(TokenType.NumberSign);
+
+    return {
+        type: 'Id',
+        info: info,
+        name: readIdent(false)
+    };
+}
+
+// + | > | ~ | /deep/
+function getCombinator() {
+    var info = getInfo();
+    var combinator;
+
+    switch (scanner.token.type) {
+        case TokenType.Space:
+            combinator = ' ';
+            scanner.next();
+            break;
+
+        case TokenType.PlusSign:
+        case TokenType.GreaterThanSign:
+        case TokenType.Tilde:
+            combinator = scanner.token.value;
+            scanner.next();
+            break;
+
+        case TokenType.Solidus:
+            combinator = '/deep/';
+            scanner.next();
+
+            expectIdentifier('deep', true);
+
+            eat(TokenType.Solidus);
+            break;
+
+        default:
+            parseError('Combinator (+, >, ~, /deep/) is expected');
+    }
+
+    return {
+        type: 'Combinator',
+        info: info,
+        name: combinator
+    };
+}
+
+// '/*' .* '*/'
+function getComment() {
+    var info = getInfo();
+    var value = scanner.token.value;
+    var len = value.length;
+
+    if (len > 4 && value.charAt(len - 2) === '*' && value.charAt(len - 1) === '/') {
+        len -= 2;
+    }
+
+    scanner.next();
+
+    return {
+        type: 'Comment',
+        info: info,
+        value: value.substring(2, len)
+    };
+}
+
+// special reader for units to avoid adjoined IE hacks (i.e. '1px\9')
+function readUnit() {
+    if (scanner.token !== null && scanner.token.type === TokenType.Identifier) {
+        var unit = scanner.token.value;
+        var backSlashPos = unit.indexOf('\\');
+
+        // no backslash in unit name
+        if (backSlashPos === -1) {
+            scanner.next();
+            return unit;
+        }
+
+        // patch token
+        scanner.token.value = unit.substr(backSlashPos);
+        scanner.token.offset += backSlashPos;
+        scanner.token.column += backSlashPos;
+
+        // return unit w/o backslash part
+        return unit.substr(0, backSlashPos);
+    }
+
+    parseError('Identifier is expected');
+}
+
+// number ident
+function getDimension(number) {
+    return {
+        type: 'Dimension',
+        info: getInfo(),
+        value: number || readNumber(),
+        unit: readUnit()
+    };
+}
+
+// number "%"
+function tryGetPercentage() {
+    var number = tryGetNumber();
+
+    if (number && scanner.token !== null && scanner.token.type === TokenType.PercentSign) {
+        return getPercentage(number);
+    }
+
+    return null;
+}
+
+function getPercentage(number) {
+    var info;
+
+    if (!number) {
+        info = getInfo();
+        number = readNumber();
+    } else {
+        info = number.info;
+        number = number.value;
+    }
+
+    eat(TokenType.PercentSign);
+
+    return {
+        type: 'Percentage',
+        info: info,
+        value: number
+    };
+}
+
+// ident '(' functionBody ')' |
+// not '(' <simpleSelector>* ')'
+function getFunction(scope, ident) {
+    var defaultArguments = getFunctionArguments;
+
+    if (!ident) {
+        ident = getIdentifier(false);
+    }
+
+    // parse special functions
+    var name = ident.name.toLowerCase();
+
+    if (specialFunctions.hasOwnProperty(scope)) {
+        if (specialFunctions[scope].hasOwnProperty(name)) {
+            return specialFunctions[scope][name](scope, ident);
+        }
+    }
+
+    return getFunctionInternal(defaultArguments, scope, ident);
+}
+
+function getFunctionInternal(functionArgumentsReader, scope, ident) {
+    var args;
+
+    eat(TokenType.LeftParenthesis);
+    args = functionArgumentsReader(scope);
+    eat(TokenType.RightParenthesis);
+
+    return {
+        type: scope === SCOPE_SELECTOR ? 'FunctionalPseudo' : 'Function',
+        info: ident.info,
+        name: ident.name,
+        arguments: args
+    };
+}
+
+function getFunctionArguments(scope) {
+    var args = new List();
+    var argument = null;
+    var child = null;
+
+    readSC();
+
+    scan:
+    while (scanner.token !== null) {
+        switch (scanner.token.type) {
+            case TokenType.RightParenthesis:
+                break scan;
+
+            case TokenType.Space:
+                child = getS();
+                break;
+
+            case TokenType.Comment: // ignore comments
+                scanner.next();
+                child = null;
+                break;
+
+            case TokenType.NumberSign: // TODO: not sure it should be here
+                child = getVhash();
+                break;
+
+            case TokenType.LeftParenthesis:
+            case TokenType.LeftSquareBracket:
+                child = getBraces(scope);
+                break;
+
+            case TokenType.Comma:
+                if (argument) {
+                    removeTrailingSpaces(argument.sequence);
+                } else {
+                    args.insert(List.createItem({
+                        type: 'Argument',
+                        sequence: new List()
+                    }));
+                }
+                scanner.next();
+                readSC();
+                argument = null;
+                child = null;
+                break;
+
+            case TokenType.Solidus:
+            case TokenType.Asterisk:
+            case TokenType.Colon:
+            case TokenType.EqualsSign:
+                child = getOperator();
+                break;
+
+            default:
+                child = getAny(scope);
+        }
+
+        if (argument === null) {
+            argument = {
+                type: 'Argument',
+                sequence: new List()
+            };
+            args.insert(List.createItem(argument));
+        }
+
+        if (child !== null) {
+            argument.sequence.insert(List.createItem(child));
+        }
+    }
+
+    if (argument !== null) {
+        removeTrailingSpaces(argument.sequence);
+    }
+
+    return args;
+}
+
+function getVarFunction(scope, ident) {
+    return getFunctionInternal(getVarFunctionArguments, scope, ident);
+}
+
+function getNotFunctionArguments() {
+    var args = new List();
+    var wasSelector = false;
+
+    scan:
+    while (scanner.token !== null) {
+        switch (scanner.token.type) {
+            case TokenType.RightParenthesis:
+                if (!wasSelector) {
+                    parseError('Simple selector is expected');
+                }
+
+                break scan;
+
+            case TokenType.Comma:
+                if (!wasSelector) {
+                    parseError('Simple selector is expected');
+                }
+
+                wasSelector = false;
+                scanner.next();
+                break;
+
+            default:
+                wasSelector = true;
+                args.insert(List.createItem(getSimpleSelector(true)));
+        }
+    }
+
+    return args;
+}
+
+function getNotFunction(scope, ident) {
+    var args;
+
+    eat(TokenType.LeftParenthesis);
+    args = getNotFunctionArguments(scope);
+    eat(TokenType.RightParenthesis);
+
+    return {
+        type: 'Negation',
+        info: ident.info,
+        // name: ident.name,  // TODO: add name?
+        sequence: args        // FIXME: -> arguments?
+    };
+}
+
+// var '(' ident (',' <declaration-value>)? ')'
+function getVarFunctionArguments() { // TODO: special type Variable?
+    var args = new List();
+
+    readSC();
+
+    args.insert(List.createItem({
+        type: 'Argument',
+        sequence: new List([getIdentifier(true)])
+    }));
+
+    readSC();
+
+    if (scanner.token !== null && scanner.token.type === TokenType.Comma) {
+        eat(TokenType.Comma);
+        readSC();
+
+        args.insert(List.createItem({
+            type: 'Argument',
+            sequence: new List([getValue(true)])
+        }));
+
+        readSC();
+    }
+
+    return args;
+}
+
+// url '(' ws* (string | raw) ws* ')'
+function getUri(scope, ident) {
+    var node = {
+        type: 'Url',
+        info: ident.info,
+        // name: ident.name,
+        value: null
+    };
+
+    eat(TokenType.LeftParenthesis); // (
+
+    readSC();
+
+    if (scanner.token.type === TokenType.String) {
+        node.value = getString();
+        readSC();
+    } else {
+        var rawInfo = getInfo();
+        var raw = '';
+
+        for (; scanner.token !== null; scanner.next()) {
+            var type = scanner.token.type;
+
+            if (type === TokenType.Space ||
+                type === TokenType.LeftParenthesis ||
+                type === TokenType.RightParenthesis) {
+                break;
+            }
+
+            raw += scanner.token.value;
+        }
+
+        node.value = {
+            type: 'Raw',
+            info: rawInfo,
+            value: raw
+        };
+
+        readSC();
+    }
+
+    eat(TokenType.RightParenthesis); // )
+
+    return node;
+}
+
+// expression '(' raw ')'
+function getOldIEExpression(scope, ident) {
+    var balance = 0;
+    var raw = '';
+
+    eat(TokenType.LeftParenthesis);
+
+    for (; scanner.token !== null; scanner.next()) {
+        if (scanner.token.type === TokenType.RightParenthesis) {
+            if (balance === 0) {
+                break;
+            }
+
+            balance--;
+        } else if (scanner.token.type === TokenType.LeftParenthesis) {
+            balance++;
+        }
+
+        raw += scanner.token.value;
+    }
+
+    eat(TokenType.RightParenthesis);
+
+    return {
+        type: 'Function',
+        info: ident.info,
+        name: ident.name,
+        arguments: new List([{
+            type: 'Argument',
+            sequence: new List([{
+                type: 'Raw',
+                value: raw
+            }])
+        }])
+    };
+}
+
+function readUnicodeRange(tryNext) {
+    var hex = '';
+
+    for (; scanner.token !== null; scanner.next()) {
+        if (scanner.token.type !== TokenType.DecimalNumber &&
+            scanner.token.type !== TokenType.Identifier) {
+            break;
+        }
+
+        hex += scanner.token.value;
+    }
+
+    if (!/^[0-9a-f]{1,6}$/i.test(hex)) {
+        parseError('Unexpected input');
+    }
+
+    // U+abc???
+    if (tryNext) {
+        for (; hex.length < 6 && scanner.token !== null; scanner.next()) {
+            if (scanner.token.type !== TokenType.QuestionMark) {
+                break;
+            }
+
+            hex += scanner.token.value;
+            tryNext = false;
+        }
+    }
+
+    // U+aaa-bbb
+    if (tryNext) {
+        if (scanner.token !== null && scanner.token.type === TokenType.HyphenMinus) {
+            scanner.next();
+
+            var next = readUnicodeRange(false);
+
+            if (!next) {
+                parseError('Unexpected input');
+            }
+
+            hex += '-' + next;
+        }
+    }
+
+    return hex;
+}
+
+function readIdent(varAllowed) {
+    var name = '';
+
+    // optional first -
+    if (scanner.token !== null && scanner.token.type === TokenType.HyphenMinus) {
+        name = '-';
+        scanner.next();
+
+        if (varAllowed && scanner.token !== null && scanner.token.type === TokenType.HyphenMinus) {
+            name = '--';
+            scanner.next();
+        }
+    }
+
+    expectAny('Identifier',
+        TokenType.LowLine,
+        TokenType.Identifier
+    );
+
+    if (scanner.token !== null) {
+        name += scanner.token.value;
+        scanner.next();
+
+        for (; scanner.token !== null; scanner.next()) {
+            var type = scanner.token.type;
+
+            if (type !== TokenType.LowLine &&
+                type !== TokenType.Identifier &&
+                type !== TokenType.DecimalNumber &&
+                type !== TokenType.HyphenMinus) {
+                break;
+            }
+
+            name += scanner.token.value;
+        }
+    }
+
+    return name;
+}
+
+function getNamespacedIdentifier(checkColon) {
+    if (scanner.token === null) {
+        parseError('Unexpected end of input');
+    }
+
+    var info = getInfo();
+    var name;
+
+    if (scanner.token.type === TokenType.Asterisk) {
+        checkColon = false;
+        name = '*';
+        scanner.next();
+    } else {
+        name = readIdent(false);
+    }
+
+    if (scanner.token !== null) {
+        if (scanner.token.type === TokenType.VerticalLine &&
+            scanner.lookupType(1, TokenType.EqualsSign) === false) {
+            name += '|';
+
+            if (scanner.next() !== null) {
+                if (scanner.token.type === TokenType.HyphenMinus ||
+                    scanner.token.type === TokenType.Identifier ||
+                    scanner.token.type === TokenType.LowLine) {
+                    name += readIdent(false);
+                } else if (scanner.token.type === TokenType.Asterisk) {
+                    checkColon = false;
+                    name += '*';
+                    scanner.next();
+                }
+            }
+        }
+    }
+
+    if (checkColon && scanner.token !== null && scanner.token.type === TokenType.Colon) {
+        scanner.next();
+        name += ':' + readIdent(false);
+    }
+
+    return {
+        type: 'Identifier',
+        info: info,
+        name: name
+    };
+}
+
+function getIdentifier(varAllowed) {
+    return {
+        type: 'Identifier',
+        info: getInfo(),
+        name: readIdent(varAllowed)
+    };
+}
+
+// ! ws* important
+function getImportant() { // TODO?
+    // var info = getInfo();
+
+    eat(TokenType.ExclamationMark);
+
+    readSC();
+
+    // return {
+    //     type: 'Identifier',
+    //     info: info,
+    //     name: readIdent(false)
+    // };
+
+    expectIdentifier('important');
+
+    readIdent(false);
+
+    // should return identifier in future for original source restoring as is
+    // returns true for now since it's fit to optimizer purposes
+    return true;
+}
+
+// odd | even | number? n
+function getNth() {
+    expectAny('Number, odd or even',
+        TokenType.Identifier,
+        TokenType.DecimalNumber
+    );
+
+    var info = getInfo();
+    var value = scanner.token.value;
+    var cmpValue;
+
+    if (scanner.token.type === TokenType.DecimalNumber) {
+        var next = scanner.lookup(1);
+        if (next !== null &&
+            next.type === TokenType.Identifier &&
+            next.value.toLowerCase() === 'n') {
+            value += next.value;
+            scanner.next();
+        }
+    } else {
+        var cmpValue = value.toLowerCase();
+        if (cmpValue !== 'odd' && cmpValue !== 'even' && cmpValue !== 'n') {
+            parseError('Unexpected identifier');
+        }
+    }
+
+    scanner.next();
+
+    return {
+        type: 'Nth',
+        info: info,
+        value: value
+    };
+}
+
+function getNthSelector() {
+    var info = getInfo();
+    var sequence = new List();
+    var node;
+    var child = null;
+
+    eat(TokenType.Colon);
+    expectIdentifier('nth', false);
+
+    node = {
+        type: 'FunctionalPseudo',
+        info: info,
+        name: readIdent(false),
+        arguments: new List([{
+            type: 'Argument',
+            sequence: sequence
+        }])
+    };
+
+    eat(TokenType.LeftParenthesis);
+
+    scan:
+    while (scanner.token !== null) {
+        switch (scanner.token.type) {
+            case TokenType.RightParenthesis:
+                break scan;
+
+            case TokenType.Space:
+            case TokenType.Comment:
+                scanner.next();
+                child = null;
+                break;
+
+            case TokenType.HyphenMinus:
+            case TokenType.PlusSign:
+                child = getOperator();
+                break;
+
+            default:
+                child = getNth();
+        }
+
+        if (child !== null) {
+            sequence.insert(List.createItem(child));
+        }
+    }
+
+    eat(TokenType.RightParenthesis);
+
+    return node;
+}
+
+function readNumber() {
+    var wasDigits = false;
+    var number = '';
+    var offset = 0;
+
+    if (scanner.lookupType(offset, TokenType.HyphenMinus)) {
+        number = '-';
+        offset++;
+    }
+
+    if (scanner.lookupType(offset, TokenType.DecimalNumber)) {
+        wasDigits = true;
+        number += scanner.lookup(offset).value;
+        offset++;
+    }
+
+    if (scanner.lookupType(offset, TokenType.FullStop)) {
+        number += '.';
+        offset++;
+    }
+
+    if (scanner.lookupType(offset, TokenType.DecimalNumber)) {
+        wasDigits = true;
+        number += scanner.lookup(offset).value;
+        offset++;
+    }
+
+    if (wasDigits) {
+        while (offset--) {
+            scanner.next();
+        }
+
+        return number;
+    }
+
+    return null;
+}
+
+function tryGetNumber() {
+    var info = getInfo();
+    var number = readNumber();
+
+    if (number !== null) {
+        return {
+            type: 'Number',
+            info: info,
+            value: number
+        };
+    }
+
+    return null;
+}
+
+// '/' | '*' | ',' | ':' | '=' | '+' | '-'
+// TODO: remove '=' since it's wrong operator, but theat as operator
+// to make old things like `filter: alpha(opacity=0)` works
+function getOperator() {
+    var node = {
+        type: 'Operator',
+        info: getInfo(),
+        value: scanner.token.value
+    };
+
+    scanner.next();
+
+    return node;
+}
+
+function getFilterValue() { // TODO
+    var progid;
+    var node = {
+        type: 'Value',
+        info: getInfo(),
+        important: false,
+        sequence: new List()
+    };
+
+    while (progid = checkProgid()) {
+        node.sequence.insert(List.createItem(getProgid(progid)));
+    }
+
+    readSC(node);
+
+    if (scanner.token !== null && scanner.token.type === TokenType.ExclamationMark) {
+        node.important = getImportant();
+    }
+
+    return node;
+}
+
+// 'progid:' ws* 'DXImageTransform.Microsoft.' ident ws* '(' .* ')'
+function checkProgid() {
+    function checkSC(offset) {
+        for (var cursor; cursor = scanner.lookup(offset); offset++) {
+            if (cursor.type !== TokenType.Space &&
+                cursor.type !== TokenType.Comment) {
+                break;
+            }
+        }
+
+        return offset;
+    }
+
+    var offset = checkSC(0);
+
+    if (scanner.lookup(offset + 1) === null ||
+        scanner.lookup(offset + 0).value.toLowerCase() !== 'progid' ||
+        scanner.lookup(offset + 1).type !== TokenType.Colon) {
+        return false; // fail
+    }
+
+    offset += 2;
+    offset = checkSC(offset);
+
+    if (scanner.lookup(offset + 5) === null ||
+        scanner.lookup(offset + 0).value.toLowerCase() !== 'dximagetransform' ||
+        scanner.lookup(offset + 1).type !== TokenType.FullStop ||
+        scanner.lookup(offset + 2).value.toLowerCase() !== 'microsoft' ||
+        scanner.lookup(offset + 3).type !== TokenType.FullStop ||
+        scanner.lookup(offset + 4).type !== TokenType.Identifier) {
+        return false; // fail
+    }
+
+    offset += 5;
+    offset = checkSC(offset);
+
+    if (scanner.lookupType(offset, TokenType.LeftParenthesis) === false) {
+        return false; // fail
+    }
+
+    for (var cursor; cursor = scanner.lookup(offset); offset++) {
+        if (cursor.type === TokenType.RightParenthesis) {
+            return cursor;
+        }
+    }
+
+    return false;
+}
+
+function getProgid(progidEnd) {
+    var value = '';
+    var node = {
+        type: 'Progid',
+        info: getInfo(),
+        value: null
+    };
+
+    if (!progidEnd) {
+        progidEnd = checkProgid();
+    }
+
+    if (!progidEnd) {
+        parseError('progid is expected');
+    }
+
+    readSC(node);
+
+    var rawInfo = getInfo();
+    for (; scanner.token && scanner.token !== progidEnd; scanner.next()) {
+        value += scanner.token.value;
+    }
+
+    eat(TokenType.RightParenthesis);
+    value += ')';
+
+    node.value = {
+        type: 'Raw',
+        info: rawInfo,
+        value: value
+    };
+
+    readSC(node);
+
+    return node;
+}
+
+// <pseudo-element> | <nth-selector> | <pseudo-class>
+function getPseudo() {
+    var next = scanner.lookup(1);
+
+    if (next === null) {
+        scanner.next();
+        parseError('Colon or identifier is expected');
+    }
+
+    if (next.type === TokenType.Colon) {
+        return getPseudoElement();
+    }
+
+    if (next.type === TokenType.Identifier &&
+        next.value.toLowerCase() === 'nth') {
+        return getNthSelector();
+    }
+
+    return getPseudoClass();
+}
+
+// :: ident
+function getPseudoElement() {
+    var info = getInfo();
+
+    eat(TokenType.Colon);
+    eat(TokenType.Colon);
+
+    return {
+        type: 'PseudoElement',
+        info: info,
+        name: readIdent(false)
+    };
+}
+
+// : ( ident | function )
+function getPseudoClass() {
+    var info = getInfo();
+    var ident = eat(TokenType.Colon) && getIdentifier(false);
+
+    if (scanner.token !== null && scanner.token.type === TokenType.LeftParenthesis) {
+        return getFunction(SCOPE_SELECTOR, ident);
+    }
+
+    return {
+        type: 'PseudoClass',
+        info: info,
+        name: ident.name
+    };
+}
+
+// ws
+function getS() {
+    var node = {
+        type: 'Space'
+        // value: scanner.token.value
+    };
+
+    scanner.next();
+
+    return node;
+}
+
+function readSC() {
+    // var nodes = [];
+
+    scan:
+    while (scanner.token !== null) {
+        switch (scanner.token.type) {
+            case TokenType.Space:
+                scanner.next();
+                // nodes.push(getS());
+                break;
+
+            case TokenType.Comment:
+                scanner.next();
+                // nodes.push(getComment());
+                break;
+
+            default:
+                break scan;
+        }
+    }
+
+    return null;
+
+    // return nodes.length ? new List(nodes) : null;
+}
+
+// node: String
+function getString() {
+    var node = {
+        type: 'String',
+        info: getInfo(),
+        value: scanner.token.value
+    };
+
+    scanner.next();
+
+    return node;
+}
+
+// # ident
+function getVhash() {
+    var info = getInfo();
+    var value;
+
+    eat(TokenType.NumberSign);
+
+    expectAny('Number or identifier',
+        TokenType.DecimalNumber,
+        TokenType.Identifier
+    );
+
+    value = scanner.token.value;
+
+    if (scanner.token.type === TokenType.DecimalNumber &&
+        scanner.lookupType(1, TokenType.Identifier)) {
+        scanner.next();
+        value += scanner.token.value;
+    }
+
+    scanner.next();
+
+    return {
+        type: 'Hash',
+        info: info,
+        value: value
+    };
+}
+
+module.exports = function parse(source, options) {
+    var ast;
+
+    if (!options || typeof options !== 'object') {
+        options = {};
+    }
+
+    var context = options.context || 'stylesheet';
+    needPositions = Boolean(options.positions);
+    filename = options.filename || '<unknown>';
+
+    if (!initialContext.hasOwnProperty(context)) {
+        throw new Error('Unknown context `' + context + '`');
+    }
+
+    scanner = new Scanner(source, blockMode.hasOwnProperty(context), options.line, options.column);
+    scanner.next();
+    ast = initialContext[context]();
+
+    scanner = null;
+
+    // console.log(JSON.stringify(ast, null, 4));
+    return ast;
+};
diff --git a/node_modules/csso/lib/parser/scanner.js b/node_modules/csso/lib/parser/scanner.js
new file mode 100644
index 00000000..066fa8e5
--- /dev/null
+++ b/node_modules/csso/lib/parser/scanner.js
@@ -0,0 +1,380 @@
+'use strict';
+
+var TokenType = require('./const.js').TokenType;
+
+var TAB = 9;
+var N = 10;
+var F = 12;
+var R = 13;
+var SPACE = 32;
+var DOUBLE_QUOTE = 34;
+var QUOTE = 39;
+var RIGHT_PARENTHESIS = 41;
+var STAR = 42;
+var SLASH = 47;
+var BACK_SLASH = 92;
+var UNDERSCORE = 95;
+var LEFT_CURLY_BRACE = 123;
+var RIGHT_CURLY_BRACE = 125;
+
+var WHITESPACE = 1;
+var PUNCTUATOR = 2;
+var DIGIT = 3;
+var STRING = 4;
+
+var PUNCTUATION = {
+    9:  TokenType.Tab,                // '\t'
+    10: TokenType.Newline,            // '\n'
+    13: TokenType.Newline,            // '\r'
+    32: TokenType.Space,              // ' '
+    33: TokenType.ExclamationMark,    // '!'
+    34: TokenType.QuotationMark,      // '"'
+    35: TokenType.NumberSign,         // '#'
+    36: TokenType.DollarSign,         // '$'
+    37: TokenType.PercentSign,        // '%'
+    38: TokenType.Ampersand,          // '&'
+    39: TokenType.Apostrophe,         // '\''
+    40: TokenType.LeftParenthesis,    // '('
+    41: TokenType.RightParenthesis,   // ')'
+    42: TokenType.Asterisk,           // '*'
+    43: TokenType.PlusSign,           // '+'
+    44: TokenType.Comma,              // ','
+    45: TokenType.HyphenMinus,        // '-'
+    46: TokenType.FullStop,           // '.'
+    47: TokenType.Solidus,            // '/'
+    58: TokenType.Colon,              // ':'
+    59: TokenType.Semicolon,          // ';'
+    60: TokenType.LessThanSign,       // '<'
+    61: TokenType.EqualsSign,         // '='
+    62: TokenType.GreaterThanSign,    // '>'
+    63: TokenType.QuestionMark,       // '?'
+    64: TokenType.CommercialAt,       // '@'
+    91: TokenType.LeftSquareBracket,  // '['
+    93: TokenType.RightSquareBracket, // ']'
+    94: TokenType.CircumflexAccent,   // '^'
+    95: TokenType.LowLine,            // '_'
+    123: TokenType.LeftCurlyBracket,  // '{'
+    124: TokenType.VerticalLine,      // '|'
+    125: TokenType.RightCurlyBracket, // '}'
+    126: TokenType.Tilde              // '~'
+};
+var SYMBOL_CATEGORY_LENGTH = Math.max.apply(null, Object.keys(PUNCTUATION)) + 1;
+var SYMBOL_CATEGORY = new Uint32Array(SYMBOL_CATEGORY_LENGTH);
+var IS_PUNCTUATOR = new Uint32Array(SYMBOL_CATEGORY_LENGTH);
+
+// fill categories
+Object.keys(PUNCTUATION).forEach(function(key) {
+    SYMBOL_CATEGORY[Number(key)] = PUNCTUATOR;
+    IS_PUNCTUATOR[Number(key)] = PUNCTUATOR;
+}, SYMBOL_CATEGORY);
+
+// don't treat as punctuator
+IS_PUNCTUATOR[UNDERSCORE] = 0;
+
+for (var i = 48; i <= 57; i++) {
+    SYMBOL_CATEGORY[i] = DIGIT;
+}
+
+SYMBOL_CATEGORY[SPACE] = WHITESPACE;
+SYMBOL_CATEGORY[TAB] = WHITESPACE;
+SYMBOL_CATEGORY[N] = WHITESPACE;
+SYMBOL_CATEGORY[R] = WHITESPACE;
+SYMBOL_CATEGORY[F] = WHITESPACE;
+
+SYMBOL_CATEGORY[QUOTE] = STRING;
+SYMBOL_CATEGORY[DOUBLE_QUOTE] = STRING;
+
+//
+// scanner
+//
+
+var Scanner = function(source, initBlockMode, initLine, initColumn) {
+    this.source = source;
+
+    this.pos = source.charCodeAt(0) === 0xFEFF ? 1 : 0;
+    this.eof = this.pos === this.source.length;
+    this.line = typeof initLine === 'undefined' ? 1 : initLine;
+    this.lineStartPos = typeof initColumn === 'undefined' ? -1 : -initColumn;
+
+    this.minBlockMode = initBlockMode ? 1 : 0;
+    this.blockMode = this.minBlockMode;
+    this.urlMode = false;
+
+    this.prevToken = null;
+    this.token = null;
+    this.buffer = [];
+};
+
+Scanner.prototype = {
+    lookup: function(offset) {
+        if (offset === 0) {
+            return this.token;
+        }
+
+        for (var i = this.buffer.length; !this.eof && i < offset; i++) {
+            this.buffer.push(this.getToken());
+        }
+
+        return offset <= this.buffer.length ? this.buffer[offset - 1] : null;
+    },
+    lookupType: function(offset, type) {
+        var token = this.lookup(offset);
+
+        return token !== null && token.type === type;
+    },
+    next: function() {
+        var newToken = null;
+
+        if (this.buffer.length !== 0) {
+            newToken = this.buffer.shift();
+        } else if (!this.eof) {
+            newToken = this.getToken();
+        }
+
+        this.prevToken = this.token;
+        this.token = newToken;
+
+        return newToken;
+    },
+
+    tokenize: function() {
+        var tokens = [];
+
+        for (; this.pos < this.source.length; this.pos++) {
+            tokens.push(this.getToken());
+        }
+
+        return tokens;
+    },
+
+    getToken: function() {
+        var code = this.source.charCodeAt(this.pos);
+        var line = this.line;
+        var column = this.pos - this.lineStartPos;
+        var offset = this.pos;
+        var next;
+        var type;
+        var value;
+
+        switch (code < SYMBOL_CATEGORY_LENGTH ? SYMBOL_CATEGORY[code] : 0) {
+            case DIGIT:
+                type = TokenType.DecimalNumber;
+                value = this.readDecimalNumber();
+                break;
+
+            case STRING:
+                type = TokenType.String;
+                value = this.readString(code);
+                break;
+
+            case WHITESPACE:
+                type = TokenType.Space;
+                value = this.readSpaces();
+                break;
+
+            case PUNCTUATOR:
+                if (code === SLASH) {
+                    next = this.pos + 1 < this.source.length ? this.source.charCodeAt(this.pos + 1) : 0;
+
+                    if (next === STAR) { // /*
+                        type = TokenType.Comment;
+                        value = this.readComment();
+                        break;
+                    } else if (next === SLASH && !this.urlMode) { // //
+                        if (this.blockMode > 0) {
+                            var skip = 2;
+
+                            while (this.source.charCodeAt(this.pos + 2) === SLASH) {
+                                skip++;
+                            }
+
+                            type = TokenType.Identifier;
+                            value = this.readIdentifier(skip);
+
+                            this.urlMode = this.urlMode || value === 'url';
+                        } else {
+                            type = TokenType.Unknown;
+                            value = this.readUnknown();
+                        }
+                        break;
+                    }
+                }
+
+                type = PUNCTUATION[code];
+                value = String.fromCharCode(code);
+                this.pos++;
+
+                if (code === RIGHT_PARENTHESIS) {
+                    this.urlMode = false;
+                } else if (code === LEFT_CURLY_BRACE) {
+                    this.blockMode++;
+                } else if (code === RIGHT_CURLY_BRACE) {
+                    if (this.blockMode > this.minBlockMode) {
+                        this.blockMode--;
+                    }
+                }
+
+                break;
+
+            default:
+                type = TokenType.Identifier;
+                value = this.readIdentifier(0);
+
+                this.urlMode = this.urlMode || value === 'url';
+        }
+
+        this.eof = this.pos === this.source.length;
+
+        return {
+            type: type,
+            value: value,
+
+            offset: offset,
+            line: line,
+            column: column
+        };
+    },
+
+    isNewline: function(code) {
+        if (code === N || code === F || code === R) {
+            if (code === R && this.pos + 1 < this.source.length && this.source.charCodeAt(this.pos + 1) === N) {
+                this.pos++;
+            }
+
+            this.line++;
+            this.lineStartPos = this.pos;
+            return true;
+        }
+
+        return false;
+    },
+
+    readSpaces: function() {
+        var start = this.pos;
+
+        for (; this.pos < this.source.length; this.pos++) {
+            var code = this.source.charCodeAt(this.pos);
+
+            if (!this.isNewline(code) && code !== SPACE && code !== TAB) {
+                break;
+            }
+        }
+
+        return this.source.substring(start, this.pos);
+    },
+
+    readComment: function() {
+        var start = this.pos;
+
+        for (this.pos += 2; this.pos < this.source.length; this.pos++) {
+            var code = this.source.charCodeAt(this.pos);
+
+            if (code === STAR) { // */
+                if (this.source.charCodeAt(this.pos + 1) === SLASH) {
+                    this.pos += 2;
+                    break;
+                }
+            } else {
+                this.isNewline(code);
+            }
+        }
+
+        return this.source.substring(start, this.pos);
+    },
+
+    readUnknown: function() {
+        var start = this.pos;
+
+        for (this.pos += 2; this.pos < this.source.length; this.pos++) {
+            if (this.isNewline(this.source.charCodeAt(this.pos), this.source)) {
+                break;
+            }
+        }
+
+        return this.source.substring(start, this.pos);
+    },
+
+    readString: function(quote) {
+        var start = this.pos;
+        var res = '';
+
+        for (this.pos++; this.pos < this.source.length; this.pos++) {
+            var code = this.source.charCodeAt(this.pos);
+
+            if (code === BACK_SLASH) {
+                var end = this.pos++;
+
+                if (this.isNewline(this.source.charCodeAt(this.pos), this.source)) {
+                    res += this.source.substring(start, end);
+                    start = this.pos + 1;
+                }
+            } else if (code === quote) {
+                this.pos++;
+                break;
+            }
+        }
+
+        return res + this.source.substring(start, this.pos);
+    },
+
+    readDecimalNumber: function() {
+        var start = this.pos;
+        var code;
+
+        for (this.pos++; this.pos < this.source.length; this.pos++) {
+            code = this.source.charCodeAt(this.pos);
+
+            if (code < 48 || code > 57) {  // 0 .. 9
+                break;
+            }
+        }
+
+        return this.source.substring(start, this.pos);
+    },
+
+    readIdentifier: function(skip) {
+        var start = this.pos;
+
+        for (this.pos += skip; this.pos < this.source.length; this.pos++) {
+            var code = this.source.charCodeAt(this.pos);
+
+            if (code === BACK_SLASH) {
+                this.pos++;
+
+                // skip escaped unicode sequence that can ends with space
+                // [0-9a-f]{1,6}(\r\n|[ \n\r\t\f])?
+                for (var i = 0; i < 7 && this.pos + i < this.source.length; i++) {
+                    code = this.source.charCodeAt(this.pos + i);
+
+                    if (i !== 6) {
+                        if ((code >= 48 && code <= 57) ||  // 0 .. 9
+                            (code >= 65 && code <= 70) ||  // A .. F
+                            (code >= 97 && code <= 102)) { // a .. f
+                            continue;
+                        }
+                    }
+
+                    if (i > 0) {
+                        this.pos += i - 1;
+                        if (code === SPACE || code === TAB || this.isNewline(code)) {
+                            this.pos++;
+                        }
+                    }
+
+                    break;
+                }
+            } else if (code < SYMBOL_CATEGORY_LENGTH &&
+                       IS_PUNCTUATOR[code] === PUNCTUATOR) {
+                break;
+            }
+        }
+
+        return this.source.substring(start, this.pos);
+    }
+};
+
+// warm up tokenizer to elimitate code branches that never execute
+// fix soft deoptimizations (insufficient type feedback)
+new Scanner('\n\r\r\n\f//""\'\'/**/1a;.{url(a)}').lookup(1e3);
+
+module.exports = Scanner;
diff --git a/node_modules/csso/lib/utils/clone.js b/node_modules/csso/lib/utils/clone.js
new file mode 100644
index 00000000..7592e9e4
--- /dev/null
+++ b/node_modules/csso/lib/utils/clone.js
@@ -0,0 +1,23 @@
+var List = require('./list');
+
+module.exports = function clone(node) {
+    var result = {};
+
+    for (var key in node) {
+        var value = node[key];
+
+        if (value) {
+            if (Array.isArray(value)) {
+                value = value.slice(0);
+            } else if (value instanceof List) {
+                value = new List(value.map(clone));
+            } else if (value.constructor === Object) {
+                value = clone(value);
+            }
+        }
+
+        result[key] = value;
+    }
+
+    return result;
+};
diff --git a/node_modules/csso/lib/utils/list.js b/node_modules/csso/lib/utils/list.js
new file mode 100644
index 00000000..30d14871
--- /dev/null
+++ b/node_modules/csso/lib/utils/list.js
@@ -0,0 +1,389 @@
+//
+//            item        item        item        item
+//          /------\    /------\    /------\    /------\
+//          | data |    | data |    | data |    | data |
+//  null <--+-prev |<---+-prev |<---+-prev |<---+-prev |
+//          | next-+--->| next-+--->| next-+--->| next-+--> null
+//          \------/    \------/    \------/    \------/
+//             ^                                    ^
+//             |                list                |
+//             |              /------\              |
+//             \--------------+-head |              |
+//                            | tail-+--------------/
+//                            \------/
+//
+
+function createItem(data) {
+    return {
+        data: data,
+        next: null,
+        prev: null
+    };
+}
+
+var List = function(values) {
+    this.cursor = null;
+    this.head = null;
+    this.tail = null;
+
+    if (Array.isArray(values)) {
+        var cursor = null;
+
+        for (var i = 0; i < values.length; i++) {
+            var item = createItem(values[i]);
+
+            if (cursor !== null) {
+                cursor.next = item;
+            } else {
+                this.head = item;
+            }
+
+            item.prev = cursor;
+            cursor = item;
+        }
+
+        this.tail = cursor;
+    }
+};
+
+Object.defineProperty(List.prototype, 'size', {
+    get: function() {
+        var size = 0;
+        var cursor = this.head;
+
+        while (cursor) {
+            size++;
+            cursor = cursor.next;
+        }
+
+        return size;
+    }
+});
+
+List.createItem = createItem;
+List.prototype.createItem = createItem;
+
+List.prototype.toArray = function() {
+    var cursor = this.head;
+    var result = [];
+
+    while (cursor) {
+        result.push(cursor.data);
+        cursor = cursor.next;
+    }
+
+    return result;
+};
+List.prototype.toJSON = function() {
+    return this.toArray();
+};
+
+List.prototype.isEmpty = function() {
+    return this.head === null;
+};
+
+List.prototype.first = function() {
+    return this.head && this.head.data;
+};
+
+List.prototype.last = function() {
+    return this.tail && this.tail.data;
+};
+
+List.prototype.each = function(fn, context) {
+    var item;
+    var cursor = {
+        prev: null,
+        next: this.head,
+        cursor: this.cursor
+    };
+
+    if (context === undefined) {
+        context = this;
+    }
+
+    // push cursor
+    this.cursor = cursor;
+
+    while (cursor.next !== null) {
+        item = cursor.next;
+        cursor.next = item.next;
+
+        fn.call(context, item.data, item, this);
+    }
+
+    // pop cursor
+    this.cursor = this.cursor.cursor;
+};
+
+List.prototype.eachRight = function(fn, context) {
+    var item;
+    var cursor = {
+        prev: this.tail,
+        next: null,
+        cursor: this.cursor
+    };
+
+    if (context === undefined) {
+        context = this;
+    }
+
+    // push cursor
+    this.cursor = cursor;
+
+    while (cursor.prev !== null) {
+        item = cursor.prev;
+        cursor.prev = item.prev;
+
+        fn.call(context, item.data, item, this);
+    }
+
+    // pop cursor
+    this.cursor = this.cursor.cursor;
+};
+
+List.prototype.nextUntil = function(start, fn, context) {
+    if (start === null) {
+        return;
+    }
+
+    var item;
+    var cursor = {
+        prev: null,
+        next: start,
+        cursor: this.cursor
+    };
+
+    if (context === undefined) {
+        context = this;
+    }
+
+    // push cursor
+    this.cursor = cursor;
+
+    while (cursor.next !== null) {
+        item = cursor.next;
+        cursor.next = item.next;
+
+        if (fn.call(context, item.data, item, this)) {
+            break;
+        }
+    }
+
+    // pop cursor
+    this.cursor = this.cursor.cursor;
+};
+
+List.prototype.prevUntil = function(start, fn, context) {
+    if (start === null) {
+        return;
+    }
+
+    var item;
+    var cursor = {
+        prev: start,
+        next: null,
+        cursor: this.cursor
+    };
+
+    if (context === undefined) {
+        context = this;
+    }
+
+    // push cursor
+    this.cursor = cursor;
+
+    while (cursor.prev !== null) {
+        item = cursor.prev;
+        cursor.prev = item.prev;
+
+        if (fn.call(context, item.data, item, this)) {
+            break;
+        }
+    }
+
+    // pop cursor
+    this.cursor = this.cursor.cursor;
+};
+
+List.prototype.some = function(fn, context) {
+    var cursor = this.head;
+
+    if (context === undefined) {
+        context = this;
+    }
+
+    while (cursor !== null) {
+        if (fn.call(context, cursor.data, cursor, this)) {
+            return true;
+        }
+
+        cursor = cursor.next;
+    }
+
+    return false;
+};
+
+List.prototype.map = function(fn, context) {
+    var result = [];
+    var cursor = this.head;
+
+    if (context === undefined) {
+        context = this;
+    }
+
+    while (cursor !== null) {
+        result.push(fn.call(context, cursor.data, cursor, this));
+        cursor = cursor.next;
+    }
+
+    return result;
+};
+
+List.prototype.copy = function() {
+    var result = new List();
+    var cursor = this.head;
+
+    while (cursor !== null) {
+        result.insert(createItem(cursor.data));
+        cursor = cursor.next;
+    }
+
+    return result;
+};
+
+List.prototype.updateCursors = function(prevOld, prevNew, nextOld, nextNew) {
+    var cursor = this.cursor;
+
+    while (cursor !== null) {
+        if (prevNew === true || cursor.prev === prevOld) {
+            cursor.prev = prevNew;
+        }
+
+        if (nextNew === true || cursor.next === nextOld) {
+            cursor.next = nextNew;
+        }
+
+        cursor = cursor.cursor;
+    }
+};
+
+List.prototype.insert = function(item, before) {
+    if (before !== undefined && before !== null) {
+        // prev   before
+        //      ^
+        //     item
+        this.updateCursors(before.prev, item, before, item);
+
+        if (before.prev === null) {
+            // insert to the beginning of list
+            if (this.head !== before) {
+                throw new Error('before doesn\'t below to list');
+            }
+
+            // since head points to before therefore list doesn't empty
+            // no need to check tail
+            this.head = item;
+            before.prev = item;
+            item.next = before;
+
+            this.updateCursors(null, item);
+        } else {
+
+            // insert between two items
+            before.prev.next = item;
+            item.prev = before.prev;
+
+            before.prev = item;
+            item.next = before;
+        }
+    } else {
+        // tail
+        //      ^
+        //     item
+        this.updateCursors(this.tail, item, null, item);
+
+        // insert to end of the list
+        if (this.tail !== null) {
+            // if list has a tail, then it also has a head, but head doesn't change
+
+            // last item -> new item
+            this.tail.next = item;
+
+            // last item <- new item
+            item.prev = this.tail;
+        } else {
+            // if list has no a tail, then it also has no a head
+            // in this case points head to new item
+            this.head = item;
+        }
+
+        // tail always start point to new item
+        this.tail = item;
+    }
+};
+
+List.prototype.remove = function(item) {
+    //      item
+    //       ^
+    // prev     next
+    this.updateCursors(item, item.prev, item, item.next);
+
+    if (item.prev !== null) {
+        item.prev.next = item.next;
+    } else {
+        if (this.head !== item) {
+            throw new Error('item doesn\'t below to list');
+        }
+
+        this.head = item.next;
+    }
+
+    if (item.next !== null) {
+        item.next.prev = item.prev;
+    } else {
+        if (this.tail !== item) {
+            throw new Error('item doesn\'t below to list');
+        }
+
+        this.tail = item.prev;
+    }
+
+    item.prev = null;
+    item.next = null;
+
+    return item;
+};
+
+List.prototype.appendList = function(list) {
+    // ignore empty lists
+    if (list.head === null) {
+        return;
+    }
+
+    this.updateCursors(this.tail, list.tail, null, list.head);
+
+    // insert to end of the list
+    if (this.tail !== null) {
+        // if destination list has a tail, then it also has a head,
+        // but head doesn't change
+
+        // dest tail -> source head
+        this.tail.next = list.head;
+
+        // dest tail <- source head
+        list.head.prev = this.tail;
+    } else {
+        // if list has no a tail, then it also has no a head
+        // in this case points head to new item
+        this.head = list.head;
+    }
+
+    // tail always start point to new item
+    this.tail = list.tail;
+
+    list.head = null;
+    list.tail = null;
+};
+
+module.exports = List;
diff --git a/node_modules/csso/lib/utils/names.js b/node_modules/csso/lib/utils/names.js
new file mode 100644
index 00000000..27277711
--- /dev/null
+++ b/node_modules/csso/lib/utils/names.js
@@ -0,0 +1,73 @@
+var hasOwnProperty = Object.prototype.hasOwnProperty;
+var knownKeywords = Object.create(null);
+var knownProperties = Object.create(null);
+
+function getVendorPrefix(string) {
+    if (string[0] === '-') {
+        // skip 2 chars to avoid wrong match with variables names
+        var secondDashIndex = string.indexOf('-', 2);
+
+        if (secondDashIndex !== -1) {
+            return string.substr(0, secondDashIndex + 1);
+        }
+    }
+
+    return '';
+}
+
+function getKeywordInfo(keyword) {
+    if (hasOwnProperty.call(knownKeywords, keyword)) {
+        return knownKeywords[keyword];
+    }
+
+    var lowerCaseKeyword = keyword.toLowerCase();
+    var vendor = getVendorPrefix(lowerCaseKeyword);
+    var name = lowerCaseKeyword;
+
+    if (vendor) {
+        name = name.substr(vendor.length);
+    }
+
+    return knownKeywords[keyword] = Object.freeze({
+        vendor: vendor,
+        prefix: vendor,
+        name: name
+    });
+}
+
+function getPropertyInfo(property) {
+    if (hasOwnProperty.call(knownProperties, property)) {
+        return knownProperties[property];
+    }
+
+    var lowerCaseProperty = property.toLowerCase();
+    var hack = lowerCaseProperty[0];
+
+    if (hack === '*' || hack === '_' || hack === '$') {
+        lowerCaseProperty = lowerCaseProperty.substr(1);
+    } else if (hack === '/' && property[1] === '/') {
+        hack = '//';
+        lowerCaseProperty = lowerCaseProperty.substr(2);
+    } else {
+        hack = '';
+    }
+
+    var vendor = getVendorPrefix(lowerCaseProperty);
+    var name = lowerCaseProperty;
+
+    if (vendor) {
+        name = name.substr(vendor.length);
+    }
+
+    return knownProperties[property] = Object.freeze({
+        hack: hack,
+        vendor: vendor,
+        prefix: hack + vendor,
+        name: name
+    });
+}
+
+module.exports = {
+    keyword: getKeywordInfo,
+    property: getPropertyInfo
+};
diff --git a/node_modules/csso/lib/utils/translate.js b/node_modules/csso/lib/utils/translate.js
new file mode 100644
index 00000000..ae7beebe
--- /dev/null
+++ b/node_modules/csso/lib/utils/translate.js
@@ -0,0 +1,178 @@
+function each(list) {
+    if (list.head === null) {
+        return '';
+    }
+
+    if (list.head === list.tail) {
+        return translate(list.head.data);
+    }
+
+    return list.map(translate).join('');
+}
+
+function eachDelim(list, delimeter) {
+    if (list.head === null) {
+        return '';
+    }
+
+    if (list.head === list.tail) {
+        return translate(list.head.data);
+    }
+
+    return list.map(translate).join(delimeter);
+}
+
+function translate(node) {
+    switch (node.type) {
+        case 'StyleSheet':
+            return each(node.rules);
+
+        case 'Atrule':
+            var nodes = ['@', node.name];
+
+            if (node.expression && !node.expression.sequence.isEmpty()) {
+                nodes.push(' ', translate(node.expression));
+            }
+
+            if (node.block) {
+                nodes.push('{', translate(node.block), '}');
+            } else {
+                nodes.push(';');
+            }
+
+            return nodes.join('');
+
+        case 'Ruleset':
+            return translate(node.selector) + '{' + translate(node.block) + '}';
+
+        case 'Selector':
+            return eachDelim(node.selectors, ',');
+
+        case 'SimpleSelector':
+            var nodes = node.sequence.map(function(node) {
+                // add extra spaces around /deep/ combinator since comment beginning/ending may to be produced
+                if (node.type === 'Combinator' && node.name === '/deep/') {
+                    return ' ' + translate(node) + ' ';
+                }
+
+                return translate(node);
+            });
+
+            return nodes.join('');
+
+        case 'Block':
+            return eachDelim(node.declarations, ';');
+
+        case 'Declaration':
+            return translate(node.property) + ':' + translate(node.value);
+
+        case 'Property':
+            return node.name;
+
+        case 'Value':
+            return node.important
+                ? each(node.sequence) + '!important'
+                : each(node.sequence);
+
+        case 'Attribute':
+            var result = translate(node.name);
+            var flagsPrefix = ' ';
+
+            if (node.operator !== null) {
+                result += node.operator;
+
+                if (node.value !== null) {
+                    result += translate(node.value);
+
+                    // space between string and flags is not required
+                    if (node.value.type === 'String') {
+                        flagsPrefix = '';
+                    }
+                }
+            }
+
+            if (node.flags !== null) {
+                result += flagsPrefix + node.flags;
+            }
+
+            return '[' + result + ']';
+
+        case 'FunctionalPseudo':
+            return ':' + node.name + '(' + eachDelim(node.arguments, ',') + ')';
+
+        case 'Function':
+            return node.name + '(' + eachDelim(node.arguments, ',') + ')';
+
+        case 'Negation':
+            return ':not(' + eachDelim(node.sequence, ',') + ')';
+
+        case 'Braces':
+            return node.open + each(node.sequence) + node.close;
+
+        case 'Argument':
+        case 'AtruleExpression':
+            return each(node.sequence);
+
+        case 'Url':
+            return 'url(' + translate(node.value) + ')';
+
+        case 'Progid':
+            return translate(node.value);
+
+        case 'Combinator':
+            return node.name;
+
+        case 'Identifier':
+            return node.name;
+
+        case 'PseudoClass':
+            return ':' + node.name;
+
+        case 'PseudoElement':
+            return '::' + node.name;
+
+        case 'Class':
+            return '.' + node.name;
+
+        case 'Id':
+            return '#' + node.name;
+
+        case 'Hash':
+            return '#' + node.value;
+
+        case 'Dimension':
+            return node.value + node.unit;
+
+        case 'Nth':
+            return node.value;
+
+        case 'Number':
+            return node.value;
+
+        case 'String':
+            return node.value;
+
+        case 'Operator':
+            return node.value;
+
+        case 'Raw':
+            return node.value;
+
+        case 'Unknown':
+            return node.value;
+
+        case 'Percentage':
+            return node.value + '%';
+
+        case 'Space':
+            return ' ';
+
+        case 'Comment':
+            return '/*' + node.value + '*/';
+
+        default:
+            throw new Error('Unknown node type: ' + node.type);
+    }
+}
+
+module.exports = translate;
diff --git a/node_modules/csso/lib/utils/translateWithSourceMap.js b/node_modules/csso/lib/utils/translateWithSourceMap.js
new file mode 100644
index 00000000..819b7af0
--- /dev/null
+++ b/node_modules/csso/lib/utils/translateWithSourceMap.js
@@ -0,0 +1,291 @@
+var SourceMapGenerator = require('source-map').SourceMapGenerator;
+var SourceNode = require('source-map').SourceNode;
+
+// Our own implementation of SourceNode#toStringWithSourceMap,
+// since SourceNode doesn't allow multiple references to original source.
+// Also, as we know structure of result we could be optimize generation
+// (currently it's ~40% faster).
+function walk(node, fn) {
+    for (var chunk, i = 0; i < node.children.length; i++) {
+        chunk = node.children[i];
+
+        if (chunk instanceof SourceNode) {
+            // this is a hack, because source maps doesn't support for 1(generated):N(original)
+            // if (chunk.merged) {
+            //     fn('', chunk);
+            // }
+
+            walk(chunk, fn);
+        } else {
+            fn(chunk, node);
+        }
+    }
+}
+
+function generateSourceMap(root) {
+    var map = new SourceMapGenerator();
+    var css = '';
+    var sourceMappingActive = false;
+    var lastOriginalLine = null;
+    var lastOriginalColumn = null;
+    var lastIndexOfNewline;
+    var generated = {
+        line: 1,
+        column: 0
+    };
+    var activatedMapping = {
+        generated: generated
+    };
+
+    walk(root, function(chunk, original) {
+        if (original.line !== null &&
+            original.column !== null) {
+            if (lastOriginalLine !== original.line ||
+                lastOriginalColumn !== original.column) {
+                map.addMapping({
+                    source: original.source,
+                    original: original,
+                    generated: generated
+                });
+            }
+
+            lastOriginalLine = original.line;
+            lastOriginalColumn = original.column;
+            sourceMappingActive = true;
+        } else if (sourceMappingActive) {
+            map.addMapping(activatedMapping);
+            sourceMappingActive = false;
+        }
+
+        css += chunk;
+
+        lastIndexOfNewline = chunk.lastIndexOf('\n');
+        if (lastIndexOfNewline !== -1) {
+            generated.line += chunk.match(/\n/g).length;
+            generated.column = chunk.length - lastIndexOfNewline - 1;
+        } else {
+            generated.column += chunk.length;
+        }
+    });
+
+    return {
+        css: css,
+        map: map
+    };
+}
+
+function createAnonymousSourceNode(children) {
+    return new SourceNode(
+        null,
+        null,
+        null,
+        children
+    );
+}
+
+function createSourceNode(info, children) {
+    if (info.primary) {
+        // special marker node to add several references to original
+        // var merged = createSourceNode(info.merged, []);
+        // merged.merged = true;
+        // children.unshift(merged);
+
+        // use recursion, because primary can also has a primary/merged info
+        return createSourceNode(info.primary, children);
+    }
+
+    return new SourceNode(
+        info.line,
+        info.column - 1,
+        info.source,
+        children
+    );
+}
+
+function each(list) {
+    if (list.head === null) {
+        return '';
+    }
+
+    if (list.head === list.tail) {
+        return translate(list.head.data);
+    }
+
+    return list.map(translate).join('');
+}
+
+function eachDelim(list, delimeter) {
+    if (list.head === null) {
+        return '';
+    }
+
+    if (list.head === list.tail) {
+        return translate(list.head.data);
+    }
+
+    return list.map(translate).join(delimeter);
+}
+
+function translate(node) {
+    switch (node.type) {
+        case 'StyleSheet':
+            return createAnonymousSourceNode(node.rules.map(translate));
+
+        case 'Atrule':
+            var nodes = ['@', node.name];
+
+            if (node.expression && !node.expression.sequence.isEmpty()) {
+                nodes.push(' ', translate(node.expression));
+            }
+
+            if (node.block) {
+                nodes.push('{', translate(node.block), '}');
+            } else {
+                nodes.push(';');
+            }
+
+            return createSourceNode(node.info, nodes);
+
+        case 'Ruleset':
+            return createAnonymousSourceNode([
+                translate(node.selector), '{', translate(node.block), '}'
+            ]);
+
+        case 'Selector':
+            return createAnonymousSourceNode(node.selectors.map(translate)).join(',');
+
+        case 'SimpleSelector':
+            var nodes = node.sequence.map(function(node) {
+                // add extra spaces around /deep/ combinator since comment beginning/ending may to be produced
+                if (node.type === 'Combinator' && node.name === '/deep/') {
+                    return ' ' + translate(node) + ' ';
+                }
+
+                return translate(node);
+            });
+
+            return createSourceNode(node.info, nodes);
+
+        case 'Block':
+            return createAnonymousSourceNode(node.declarations.map(translate)).join(';');
+
+        case 'Declaration':
+            return createSourceNode(
+                node.info,
+                [translate(node.property), ':', translate(node.value)]
+            );
+
+        case 'Property':
+            return node.name;
+
+        case 'Value':
+            return node.important
+                ? each(node.sequence) + '!important'
+                : each(node.sequence);
+
+        case 'Attribute':
+            var result = translate(node.name);
+            var flagsPrefix = ' ';
+
+            if (node.operator !== null) {
+                result += node.operator;
+
+                if (node.value !== null) {
+                    result += translate(node.value);
+
+                    // space between string and flags is not required
+                    if (node.value.type === 'String') {
+                        flagsPrefix = '';
+                    }
+                }
+            }
+
+            if (node.flags !== null) {
+                result += flagsPrefix + node.flags;
+            }
+
+            return '[' + result + ']';
+
+        case 'FunctionalPseudo':
+            return ':' + node.name + '(' + eachDelim(node.arguments, ',') + ')';
+
+        case 'Function':
+            return node.name + '(' + eachDelim(node.arguments, ',') + ')';
+
+        case 'Negation':
+            return ':not(' + eachDelim(node.sequence, ',') + ')';
+
+        case 'Braces':
+            return node.open + each(node.sequence) + node.close;
+
+        case 'Argument':
+        case 'AtruleExpression':
+            return each(node.sequence);
+
+        case 'Url':
+            return 'url(' + translate(node.value) + ')';
+
+        case 'Progid':
+            return translate(node.value);
+
+        case 'Combinator':
+            return node.name;
+
+        case 'Identifier':
+            return node.name;
+
+        case 'PseudoClass':
+            return ':' + node.name;
+
+        case 'PseudoElement':
+            return '::' + node.name;
+
+        case 'Class':
+            return '.' + node.name;
+
+        case 'Id':
+            return '#' + node.name;
+
+        case 'Hash':
+            return '#' + node.value;
+
+        case 'Dimension':
+            return node.value + node.unit;
+
+        case 'Nth':
+            return node.value;
+
+        case 'Number':
+            return node.value;
+
+        case 'String':
+            return node.value;
+
+        case 'Operator':
+            return node.value;
+
+        case 'Raw':
+            return node.value;
+
+        case 'Unknown':
+            return node.value;
+
+        case 'Percentage':
+            return node.value + '%';
+
+        case 'Space':
+            return ' ';
+
+        case 'Comment':
+            return '/*' + node.value + '*/';
+
+        default:
+            throw new Error('Unknown node type: ' + node.type);
+    }
+}
+
+module.exports = function(node) {
+    return generateSourceMap(
+        createAnonymousSourceNode(translate(node))
+    );
+};
diff --git a/node_modules/csso/lib/utils/walk.js b/node_modules/csso/lib/utils/walk.js
new file mode 100644
index 00000000..a7948eb8
--- /dev/null
+++ b/node_modules/csso/lib/utils/walk.js
@@ -0,0 +1,189 @@
+function walkRules(node, item, list) {
+    switch (node.type) {
+        case 'StyleSheet':
+            var oldStylesheet = this.stylesheet;
+            this.stylesheet = node;
+
+            node.rules.each(walkRules, this);
+
+            this.stylesheet = oldStylesheet;
+            break;
+
+        case 'Atrule':
+            if (node.block !== null) {
+                walkRules.call(this, node.block);
+            }
+
+            this.fn(node, item, list);
+            break;
+
+        case 'Ruleset':
+            this.fn(node, item, list);
+            break;
+    }
+
+}
+
+function walkRulesRight(node, item, list) {
+    switch (node.type) {
+        case 'StyleSheet':
+            var oldStylesheet = this.stylesheet;
+            this.stylesheet = node;
+
+            node.rules.eachRight(walkRulesRight, this);
+
+            this.stylesheet = oldStylesheet;
+            break;
+
+        case 'Atrule':
+            if (node.block !== null) {
+                walkRulesRight.call(this, node.block);
+            }
+
+            this.fn(node, item, list);
+            break;
+
+        case 'Ruleset':
+            this.fn(node, item, list);
+            break;
+    }
+}
+
+function walkAll(node, item, list) {
+    switch (node.type) {
+        case 'StyleSheet':
+            var oldStylesheet = this.stylesheet;
+            this.stylesheet = node;
+
+            node.rules.each(walkAll, this);
+
+            this.stylesheet = oldStylesheet;
+            break;
+
+        case 'Atrule':
+            if (node.expression !== null) {
+                walkAll.call(this, node.expression);
+            }
+            if (node.block !== null) {
+                walkAll.call(this, node.block);
+            }
+            break;
+
+        case 'Ruleset':
+            this.ruleset = node;
+
+            if (node.selector !== null) {
+                walkAll.call(this, node.selector);
+            }
+            walkAll.call(this, node.block);
+
+            this.ruleset = null;
+            break;
+
+        case 'Selector':
+            var oldSelector = this.selector;
+            this.selector = node;
+
+            node.selectors.each(walkAll, this);
+
+            this.selector = oldSelector;
+            break;
+
+        case 'Block':
+            node.declarations.each(walkAll, this);
+            break;
+
+        case 'Declaration':
+            this.declaration = node;
+
+            walkAll.call(this, node.property);
+            walkAll.call(this, node.value);
+
+            this.declaration = null;
+            break;
+
+        case 'Attribute':
+            walkAll.call(this, node.name);
+            if (node.value !== null) {
+                walkAll.call(this, node.value);
+            }
+            break;
+
+        case 'FunctionalPseudo':
+        case 'Function':
+            this['function'] = node;
+
+            node.arguments.each(walkAll, this);
+
+            this['function'] = null;
+            break;
+
+        case 'AtruleExpression':
+            this.atruleExpression = node;
+
+            node.sequence.each(walkAll, this);
+
+            this.atruleExpression = null;
+            break;
+
+        case 'Value':
+        case 'Argument':
+        case 'SimpleSelector':
+        case 'Braces':
+        case 'Negation':
+            node.sequence.each(walkAll, this);
+            break;
+
+        case 'Url':
+        case 'Progid':
+            walkAll.call(this, node.value);
+            break;
+
+        // nothig to do with
+        // case 'Property':
+        // case 'Combinator':
+        // case 'Dimension':
+        // case 'Hash':
+        // case 'Identifier':
+        // case 'Nth':
+        // case 'Class':
+        // case 'Id':
+        // case 'Percentage':
+        // case 'PseudoClass':
+        // case 'PseudoElement':
+        // case 'Space':
+        // case 'Number':
+        // case 'String':
+        // case 'Operator':
+        // case 'Raw':
+    }
+
+    this.fn(node, item, list);
+}
+
+function createContext(root, fn) {
+    var context = {
+        fn: fn,
+        root: root,
+        stylesheet: null,
+        atruleExpression: null,
+        ruleset: null,
+        selector: null,
+        declaration: null,
+        function: null
+    };
+
+    return context;
+}
+
+module.exports = {
+    all: function(root, fn) {
+        walkAll.call(createContext(root, fn), root);
+    },
+    rules: function(root, fn) {
+        walkRules.call(createContext(root, fn), root);
+    },
+    rulesRight: function(root, fn) {
+        walkRulesRight.call(createContext(root, fn), root);
+    }
+};