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/*!
* Connect - compiler
* Copyright(c) 2010 Sencha Inc.
* Copyright(c) 2011 TJ Holowaychuk
* MIT Licensed
*/
/**
* Module dependencies.
*/
var fs = require('fs')
, path = require('path')
, parse = require('url').parse;
/**
* Require cache.
*/
var cache = {};
/**
* Setup compiler.
*
* Options:
*
* - `src` Source directory, defaults to **CWD**.
* - `dest` Destination directory, defaults `src`.
* - `enable` Array of enabled compilers.
*
* Compilers:
*
* - `sass` Compiles sass to css
* - `less` Compiles less to css
* - `coffeescript` Compiles coffee to js
*
* @param {Object} options
* @api public
*/
exports = module.exports = function compiler(options){
options = options || {};
var srcDir = options.src || process.cwd()
, destDir = options.dest || srcDir
, enable = options.enable;
if (!enable || enable.length === 0) {
throw new Error('compiler\'s "enable" option is not set, nothing will be compiled.');
}
return function compiler(req, res, next){
if ('GET' != req.method) return next();
var pathname = parse(req.url).pathname;
for (var i = 0, len = enable.length; i < len; ++i) {
var name = enable[i]
, compiler = compilers[name];
if (compiler.match.test(pathname)) {
var src = (srcDir + pathname).replace(compiler.match, compiler.ext)
, dest = destDir + pathname;
// Compare mtimes
fs.stat(src, function(err, srcStats){
if (err) {
if ('ENOENT' == err.code) {
next();
} else {
next(err);
}
} else {
fs.stat(dest, function(err, destStats){
if (err) {
// Oh snap! it does not exist, compile it
if ('ENOENT' == err.code) {
compile();
} else {
next(err);
}
} else {
// Source has changed, compile it
if (srcStats.mtime > destStats.mtime) {
compile();
} else {
// Defer file serving
next();
}
}
});
}
});
// Compile to the destination
function compile() {
fs.readFile(src, 'utf8', function(err, str){
if (err) {
next(err);
} else {
compiler.compile(str, function(err, str){
if (err) {
next(err);
} else {
fs.writeFile(dest, str, 'utf8', function(err){
next(err);
});
}
});
}
});
}
return;
}
}
next();
};
};
/**
* Bundled compilers:
*
* - [sass](http://github.com/visionmedia/sass.js) to _css_
* - [less](http://github.com/cloudhead/less.js) to _css_
* - [coffee](http://github.com/jashkenas/coffee-script) to _js_
*/
var compilers = exports.compilers = {
sass: {
match: /\.css$/,
ext: '.sass',
compile: function(str, fn){
var sass = cache.sass || (cache.sass = require('sass'));
try {
fn(null, sass.render(str));
} catch (err) {
fn(err);
}
}
},
less: {
match: /\.css$/,
ext: '.less',
compile: function(str, fn){
var less = cache.less || (cache.less = require('less'));
try {
less.render(str, fn);
} catch (err) {
fn(err);
}
}
},
coffeescript: {
match: /\.js$/,
ext: '.coffee',
compile: function(str, fn){
var coffee = cache.coffee || (cache.coffee = require('coffee-script'));
try {
fn(null, coffee.compile(str));
} catch (err) {
fn(err);
}
}
}
};