1 files changed, 261 insertions, 0 deletions
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);
+    });
+};