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// Except for a block in #visitImport, everything here is an exact copy of the
// source in stylus this currently depends on. If stylus is updated, update
// this appropriately.
var Evaluator = require('stylus/lib/visitor/evaluator')
, nodes = require('stylus/lib/nodes')
, Stack = require('stylus/lib/stack')
, Frame = require('stylus/lib/stack/frame')
, Scope = require('stylus/lib/stack/scope')
, utils = require('stylus/lib/utils')
, bifs = require('stylus/lib/functions')
, basename = require('path').basename
, dirname = require('path').dirname
, relative = require('path').relative
, join = require('path').join
, colors = require('stylus/lib/colors')
// , debug = require('debug')('stylus:evaluator')
, fs = require('fs');
module.exports = CachedPathEvaluator;
/**
* Import `file` and return Block node.
*
* @api private
*/
function importFile(node, file, literal, index) {
var importStack = this.importStack
, Parser = require('stylus/lib/parser')
, stat;
// Handling the `require`
if (node.once) {
if (this.requireHistory[file]) return nodes.null;
this.requireHistory[file] = true;
if (literal && !this.includeCSS) {
return node;
}
}
// Expose imports
node.path = file;
node.dirname = dirname(file);
// Store the modified time
stat = fs.statSync(file);
node.mtime = stat.mtime;
this.paths.push(node.dirname);
// Avoid overflows from importing the same file over again
if (file === importStack[importStack.length - 1]) return nodes.null;
if (this.options._imports) this.options._imports.push(node.clone());
// Parse the file
importStack.push(file);
nodes.filename = file;
var str;
if (this.cache.sources && this.cache.sources[file]) {
str = this.cache.sources[file];
} else {
str = fs.readFileSync(file, 'utf8');
}
if (literal && !this.resolveURL) return new nodes.Literal(str.replace(/\r\n?/g, '\n'));
// parse
var block = new nodes.Block
, parser = new Parser(str, utils.merge({ root: block }, this.options));
try {
block = parser.parse();
} catch (err) {
err.filename = file;
err.lineno = parser.lexer.lineno;
err.input = str;
throw err;
}
// Evaluate imported "root"
block.parent = this.root;
block.scope = false;
var ret = this.visit(block);
importStack.pop();
if (importStack.length || index) this.paths.pop();
return ret;
}
function CachedPathEvaluator(root, options) {
Evaluator.apply(this, arguments);
this.cache = options.cache;
}
CachedPathEvaluator.prototype = Object.create(Evaluator.prototype);
CachedPathEvaluator.prototype.constructor = CachedPathEvaluator;
CachedPathEvaluator.prototype.visitImport = function(imported) {
this.return++;
var path = this.visit(imported.path).first
, nodeName = imported.once ? 'require' : 'import'
, found
, literal
, index;
this.return--;
// debug('import %s', path);
// url() passed
if ('url' == path.name) {
if (imported.once) throw new Error('You cannot @require a url');
return imported;
}
// Ensure string
if (!path.string) throw new Error('@' + nodeName + ' string expected');
var name = path = path.string;
// Absolute URL
if (/url\s*\(\s*['"]?(?:https?:)?\/\//i.test(path)) {
if (imported.once) throw new Error('You cannot @require a url');
return imported;
}
// Literal
if (/\.css(?:"|$)/.test(path)) {
literal = true;
if (!imported.once && !this.includeCSS) {
return imported;
}
}
// support optional .styl
if (!literal && !/\.styl$/i.test(path)) path += '.styl';
/*****************************************************************************
* THIS IS THE ONLY BLOCK THAT DIFFERS FROM THE ACTUAL STYLUS IMPLEMENTATION. *
*****************************************************************************/
// Lookup
var dirname = this.paths[this.paths.length - 1];
found = this.cache.find(path, dirname);
index = this.cache.isIndex(path, dirname);
if (!found) {
found = utils.find(path, this.paths, this.filename);
if (!found) {
found = utils.lookupIndex(name, this.paths, this.filename);
index = true;
}
}
// Throw if import failed
if (!found) throw new Error('failed to locate @' + nodeName + ' file ' + path);
var block = new nodes.Block;
for (var i = 0, len = found.length; i < len; ++i) {
block.push(importFile.call(this, imported, found[i], literal, index));
}
return block;
}
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