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node-less.js
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node-less.js
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/*
* Node-Less Node Parser CommonJS Module 0.1
*
* Simplified BSD License (@see License)
* @author Gregor Schwab
* @copyright (c) 2010 Gregor Schwab
* Usage Command Line: node node-less file1.less file2.less ...
* Output Command Line: file1.less.css file2.less.css
* Usage as Module: require(node-less); new NodeLess().parse(inputArr, options, callback);
* @requires less
*/
(function() {
var less = require('less'),
path = require('path'),
fs = require('fs'),
sys = require('sys');
var exports;
// Establish the root object,`global` on the server.
var root = this;
// Create a safe reference to the nodeless object for use below.
/**
* Nodeless class.
* @param {Object} options (optional) currently just if called from commandline cl=true
* @constructor
*/
var NodeLess=function (options) {
if (options && typeof options!=="object"){throw Error("NodeLess constructor options is not an Object");}
this.cl=options.cl||false;
};
/**
* Call this function to parse less files
* @param {Array} inputArr Array of filepath strings pointing to the .less files
* @param {Object} options (optional) of options (not used at the moment)
* @param {function} callback(css) (optional) a callback to return the parsed css back (only when used as a Module)
* @throws Error if wrong argument types are given
*/
NodeLess.prototype.parse = function (inputArr, options, callback) { //takes a filename Array, some options and a clallback
//callback (parsed css output Array)
processArguments(arguments);
function processArguments(arguments){
var args=Array.prototype.slice.call(arguments);
// console.log(Array.isArray(args))
if (args.length===0){throw Error("[Exception] no Arguments specified to function parse, you must at least specify one Argument");}
if (!Array.isArray(args[0])|| args[0].length===0){throw Error("[Exception] first Argument must be a non empty Array of pathnames");}
//check first parameter
args[0].forEach(function(arg){
if (path.extname(arg)!==".less"){throw Error("[Exception] The filename should end with .less");}
});
//check (optional) second parameter
if(args[1]&&typeof args[1]!=="object"){throw Error("[Exception] 2nd parameter must be an Object");}
//check (optional) third parameter
if(args[2]&&typeof args[2]!=="function"){throw Error("[Exception] 3rd parameter must be a function");}
}
options = options || {};
var cl=this.cl;
var outputArr=[];
function respondError(msg) {
if(cl){
console.log("[ERROR] LESS.js Error: "+msg);
}else{
addError("[ERROR] LESS.js Error: "+msg);
}
}
inputArr.forEach(function(input, index, inputArr){
outputArr[index]={};
//inputArr[index]=input=input.replace(/\.css$/, ""); //if the file name is .less.css make it .less
fs.stat(input, function (e, stats) {
if (e) {
respondError("File Not Found "+e);
}
fs.open(input, 'r', stats.mode, function (e, fd) {
fs.read(fd, stats.size, 0, "utf8", function (e, data) {
new(less.Parser)({
paths: [path.dirname(input)],
filename: input
}).parse(data, function (err, tree) {
if (err) {
respondError(err)
} else {
try {
var css = tree.toCSS({ compress: options.compress });
handleResponse(css);
//response.end(css);
} catch (e) {
respondError(e)
throw e;
}
}
});
});
});
function handleResponse(css){
if (cl){//if we were called from the command line wrtie out a file
writeToFile(css)
}else{
addToResponse(css)
}
function writeToFile(css){//write the file as .less.css
var buf=new Buffer(css, encoding='utf8')
fs.open(input+".css", 'w', stats.mode, function (e, fd) {
fs.write(fd, buf, 0, buf.length, 0, function(err, written){
if (err) {
respondError(err)
}
fs.close(fd, function(err){
if (err) {
respondError(err)
}
})
})
})
}
function addToResponse(css){
ouput=ouputArr[index];
ouput.css=css;
ouputArr[index]=ouput;
}
}
});
function addError(msg){
errors=ouputArr[index].errors;
if(errors){errors.push("LESS.js Error: "+msg)}else{errors=[];}
ouputArr[index]={css:null, errors:errors}
}
});
if (!cl&&typeof callback=="function"){
callback(ouputArr);
}else if (typeof callback=="function"){
throw Error("callbacks are not supported for Command line use. This shouldn't happen!");
}
}
// Export the nodeless object for **CommonJS**.
if (typeof exports !== 'undefined') exports.NodeLess = NodeLess;
// Export Underscore to the global scope.
root.NodeLess = NodeLess;
// Current version.
NodeLess.VERSION = '0.0.1';
//if started from commandline filenames must be called .less and will be outpu as .less.css
var command=process.ARGV[1];
var lastPath=path.basename(command);
if (typeof lastPath != "undefined" && lastPath!=null && typeof lastPath=="string"){
if (lastPath=="node-less.js"){ //called from command line
console.log("[INFO] node-less called from command line");
var cl=true;
//get the arguments and call parse
var arguments=process.ARGV.slice(2);//slice away the first two parameters, the rest are arguments
if (arguments.length==0){console.log("[ERROR] Please provide at least one file to parse");return;}
arguments.forEach(function(argument){
//do some checking her
if (path.extname(argument)!==".less"){
console.log("[ERROR] The filename shall end with .less by our convention");
return;
}
});
var lessParser= new NodeLess({cl:cl}).parse(arguments);
}else{
console.log("[INFO] node-less called as Module")
exports.cl=false;
}
}
})();