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/**
* Module dependencies.
*/
var Compiler = require('../visitor/compiler')
, nodes = require('../nodes')
, parse = require('url').parse
, relative = require('path').relative
, join = require('path').join
, dirname = require('path').dirname
, extname = require('path').extname
, sep = require('path').sep;
/**
* Return a url() function which resolves urls.
*
* Options:
*
* - `paths` resolution path(s), merged with general lookup paths
* - `nocheck` don't check file existence
*
* Examples:
*
* stylus(str)
* .set('filename', __dirname + '/css/test.styl')
* .define('url', stylus.resolver({ nocheck: true }))
* .render(function(err, css){ ... })
*
* @param {Object} [options]
* @return {Function}
* @api public
*/
module.exports = function(options) {
options = options || {};
function resolver(url) {
// Compile the url
var compiler = new Compiler(url)
, filename = url.filename;
compiler.isURL = true;
url = parse(url.nodes.map(function(node){
return compiler.visit(node);
}).join(''));
// Parse literal
var literal = new nodes.Literal('url("' + url.href + '")')
, path = url.pathname
, dest = this.options.dest
, tail = ''
, res;
// Absolute or hash
if (url.protocol || !path || '/' == path[0]) return literal;
// Check that file exists
if (!options.nocheck) {
var _paths = options.paths || [];
path = require('../utils').lookup(path, _paths.concat(this.paths));
if (!path) return literal;
}
if (this.includeCSS && extname(path) == '.css')
return new nodes.Literal(url.href);
if (url.search) tail += url.search;
if (url.hash) tail += url.hash;
if (dest && extname(dest) == '.css')
dest = dirname(dest);
res = relative(dest || dirname(this.filename), options.nocheck
? join(dirname(filename), path)
: path) + tail;
if ('\\' == sep) res = res.replace(/\\/g, '/');
return new nodes.Literal('url("' + res + '")');
};
// Expose options to Evaluator
resolver.options = options;
resolver.raw = true;
return resolver;
};
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