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build.js
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#!/usr/bin/env node
;(function() {
'use strict';
/** The Node filesystem, path, and child process modules */
var fs = require('fs'),
path = require('path'),
spawn = require('child_process').spawn;
/** The build directory containing the build scripts */
var buildPath = path.join(__dirname, 'build');
/** The distribution directory */
var distPath = path.join(__dirname, 'dist');
/** Load the pre- and post-processors */
var preprocess = require(path.join(buildPath, 'pre-compile')),
postprocess = require(path.join(buildPath, 'post-compile'));
/** The pre-processed Lo-Dash source */
var source = preprocess(fs.readFileSync(path.join(__dirname, 'lodash.js'), 'utf8'));
/** Load the UglifyJS compressor */
var uglifyJS = require(path.join(__dirname, 'vendor', 'uglifyjs', 'uglify-js'));
/*--------------------------------------------------------------------------*/
/**
* Compresses a `source` string using the Closure Compiler. Yields the
* minified result, and any exceptions encountered, to a `callback` function.
*
* @private
* @param {String} source The JavaScript source to minify.
* @param {Function} callback The function called when minifying is complete.
*/
function compile(source, callback) {
var stderr = '',
stdout = '';
var compiler = spawn('java', [
// load the Closure Compiler and set the compression options
'-jar', path.join(__dirname, 'vendor', 'closure-compiler', 'compiler.jar'),
'--compilation_level=ADVANCED_OPTIMIZATIONS',
'--language_in=ECMASCRIPT5_STRICT',
'--warning_level=QUIET'
]);
// explicitly set the encoding of the output and error streams
compiler.stdout.setEncoding('utf8');
compiler.stderr.setEncoding('utf8');
compiler.stdout.on('data', function(data) {
stdout += data;
});
compiler.stderr.on('data', function(data) {
stderr += data;
});
compiler.on('exit', function(status) {
var exception = null;
if (status) {
exception = new Error(stderr);
exception.status = status;
}
callback(exception, stdout);
});
// proxy the source string to Closure Compiler
compiler.stdin.end(source);
}
/**
* Compresses a `source` string using the Unix `gzip` commands. Yields the
* result, and any exceptions encountered, to a `callback` function.
*
* @private
* @param {String} source The JavaScript source to gzip.
* @param {Function} callback The function called when gzipping is complete.
*/
function gzip(source, callback) {
var compressor = spawn('gzip', ['-9f', '-c']),
stderr = '',
stdout = '';
compressor.stdout.setEncoding('binary');
compressor.stderr.setEncoding('utf8');
compressor.stdout.on('data', function(data) {
stdout += data;
});
compressor.stderr.on('data', function(data) {
stderr += data;
});
compressor.on('exit', function(status) {
var exception = null;
if (status) {
exception = new Error(stderr);
exception.status = status;
}
callback(exception, stdout);
});
// proxy the source string to the `gzip` executable
compressor.stdin.end(source);
}
/**
* Compresses a `source` string using UglifyJS. Yields the result to a
* `callback` function. This function is synchronous; the `callback` is used
* for symmetry.
*
* @private
* @param {String} source The JavaScript source to minify.
* @param {Function} callback The function called when minifying is complete.
*/
function uglify(source, callback) {
var ugly = uglifyJS.uglify;
var result = ugly.gen_code(
// enable unsafe transformations.
ugly.ast_squeeze_more(
ugly.ast_squeeze(
// munge variable and function names, excluding the special `define`
// function exposed by AMD loaders.
ugly.ast_mangle(uglifyJS.parser.parse(source), {
'except': ['define']
}
))), {
'ascii_only': true
});
// split lines at 500 characters to be consistent with Closure Compiler
callback(ugly.split_lines(result, 500));
}
/*--------------------------------------------------------------------------*/
// create the destination directory if it doesn't exist
if (!path.existsSync(distPath)) {
fs.mkdirSync(distPath);
}
// compress and `gzip` Lo-Dash using the Closure Compiler
compile(source, function(exception, result) {
if (exception) {
throw exception;
}
// post-process the minified source
var source = postprocess(result);
// save the final minified version
fs.writeFileSync(path.join(distPath, 'lodash.compiler.js'), source);
// save the `gzip`-ed version
gzip(source, function(exception, result) {
if (exception) {
throw exception;
}
// explicit `binary` encoding is necessary to ensure that the stream is written correctly
fs.writeFileSync(path.join(distPath, 'lodash.compiler.js.gz'), result, 'binary');
});
});
// compress and `gzip` Lo-Dash using UglifyJS
uglify(source, function(result) {
var source = postprocess(result);
fs.writeFileSync(path.join(distPath, 'lodash.uglify.js'), source);
gzip(source, function(exception, result) {
if (exception) {
throw exception;
}
fs.writeFileSync(path.join(distPath, 'lodash.uglify.js.gz'), result, 'binary');
});
});
}());