/*!
* Stylus - plugin - url
* Copyright(c) 2010 LearnBoost <dev@learnboost.com>
* MIT Licensed
*/
/**
* Module dependencies.
*/
var Compiler = require('../visitor/compiler')
, nodes = require('../nodes')
, parse = require('url').parse
, extname = require('path').extname
, utils = require('../utils')
, fs = require('fs');
/**
* Mime table.
*/
var mimes = {
'.gif': 'image/gif'
, '.png': 'image/png'
, '.jpg': 'image/jpeg'
, '.jpeg': 'image/jpeg'
, '.svg': 'image/svg+xml'
};
/**
* Return a url() function with the given `options`.
*
* Options:
*
* - `limit` bytesize limit defaulting to 30Kb
* - `paths` image resolution path(s), merged with general lookup paths
*
* Examples:
*
* stylus(str)
* .set('filename', __dirname + '/css/test.styl')
* .define('url', stylus.url({ paths: [__dirname + '/public'] }))
* .render(function(err, css){ ... })
*
* @param {Object} options
* @return {Function}
* @api public
*/
module.exports = function(options) {
options = options || {};
var _paths = options.paths || [];
var sizeLimit = null != options.limit ? options.limit : 30000;
function fn(url){
// Compile the url
var compiler = new Compiler(url);
compiler.isURL = true;
url = url.nodes.map(function(node){
return compiler.visit(node);
}).join('');
// Parse literal
url = parse(url);
var ext = extname(url.pathname)
, mime = mimes[ext]
, literal = new nodes.Literal('url("' + url.href + '")')
, paths = _paths.concat(this.paths)
, buf;
// Not supported
if (!mime) return literal;
// Absolute
if (url.protocol) return literal;
// Lookup
var found = utils.lookup(url.pathname, paths);
// Failed to lookup
if (!found) return literal;
// Read data
buf = fs.readFileSync(found);
// To large
if (false !== sizeLimit && buf.length > sizeLimit) return literal;
// Encode
return new nodes.Literal('url("data:' + mime + ';base64,' + buf.toString('base64') + '")');
};
fn.raw = true;
return fn;
};