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compress-worker.js
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compress-worker.js
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const
cachify = require('connect-cachify'),
config = require('../lib/configuration.js'),
fs = require('fs'),
jsp = require("uglify-js").parser,
logger = require('../lib/logging.js').logger,
pro = require("uglify-js").uglify,
uglifycss = require('uglifycss'),
mkdirp = require('mkdirp'),
path = require('path');
function compressResource(staticPath, name, files, cb) {
var orig_code = "";
var info = undefined;
// Cachify only used in compress for CSS Images, so no asserts needed
cachify.setup({}, {
prefix: config.get('cachify_prefix'),
root: staticPath
});
function writeFile(final_code) {
mkdirp(path.join(staticPath, path.dirname(name)), function (err) {
if (err) cb(err);
else {
fs.writeFile(path.join(staticPath, name), final_code, function(err) {
cb(err, info);
});
};
});
}
function extract_copyright(code) {
var tok = jsp.tokenizer(code), toks, ret = "";
toks = tok().comments_before;
if (toks.length >= 1) {
var c = toks[0];
// copyrights that we'll include MUST be before code body and have
// the form: /** */
if (c.value.substr(0, 1) === '*' && c.type === 'comment2') {
ret += "/*" + c.value + "*/";
}
}
return ret;
};
function compress() {
try {
var final_code;
if (/\.js$/.test(name)) {
// extract copyright
var copyright = extract_copyright(orig_code) || "";
if (copyright.length) copyright += "\n\n";
// compress javascript
var ast = jsp.parse(orig_code); // parse code and get the initial AST
ast = pro.ast_mangle(ast); // get a new AST with mangled names
ast = pro.ast_squeeze(ast); // get an AST with compression optimizations
final_code = copyright + pro.split_lines(pro.gen_code(ast), 32 * 1024); // compressed code here
} else if (/\.css$/.test(name)) {
// compress css
var cach_code = cachify_embedded(orig_code);
final_code = uglifycss.processString(cach_code);
} else {
return cb("can't determine content type: " + name);
}
writeFile(final_code);
} catch(e) {
cb("error compressing: " + e.toString() + "\n");
}
}
function readNext() {
if (files.length) {
var f = files.shift();
fs.readFile(path.join(staticPath, f), function(err, data) {
if (err) cb(err);
else {
orig_code += data;
readNext();
}
});
} else {
compress();
}
}
function isBuildNeeded() {
// we'll check mtime on all files. if any is newer than the output file,
// build is needed
try {
var lastGen = fs.statSync(path.join(staticPath, name)).mtime;
for (var i = 0; i < files.length; i++) {
if (lastGen < fs.statSync(path.join(staticPath, files[i])).mtime) {
info = "rebuilt because " + files[i] + " was changed";
throw "newer";
}
};
// no rebuild needed
cb(null, "up to date");
} catch (e) {
readNext();
}
}
isBuildNeeded();
}
function cachify_embedded (css_src) {
// RegExp is set up to handle multiple url's per declaration, which is
// possible for things like background-images.
return css_src.replace(/url\s*\(['"]([^\)'"]+)\s*['"]\s*\)/g, function (str, url) {
// This will throw an error if url doesn't exist. This is good as we will
// catch typos during build.
logger.info("For " + str + " making " + url + " into " + cachify.cachify(url));
return "url('" + cachify.cachify(url) + "')";
});
}
process.on('message', function(m) {
var startTime = new Date;
compressResource(m.staticPath, m.file, m.deps, function(err, info) {
if (err) process.send({ error: err });
else process.send({
time: ((new Date - startTime) / 1000.0).toFixed(2),
info: info
});
});
});