jquery/build/uglify.js

#! /usr/bin/env node
// -*- js -*-

global.sys = require(/^v0\.[012]/.test(process.version) ? "sys" : "util");
var fs = require("fs");
var jsp = require("./lib/parse-js"),
	pro = require("./lib/process");

var options = {
        ast: false,
        mangle: true,
        mangle_toplevel: false,
        squeeze: true,
        make_seqs: true,
        dead_code: true,
        verbose: false,
        show_copyright: true,
        out_same_file: false,
        max_line_length: 32 * 1024,
        unsafe: false,
        reserved_names: null,
        defines: { },
        codegen_options: {
                ascii_only: false,
                beautify: false,
                indent_level: 4,
                indent_start: 0,
                quote_keys: false,
                space_colon: false
        },
        output: true            // stdout
};

var args = jsp.slice(process.argv, 2);
var filename;

out: while (args.length > 0) {
        var v = args.shift();
        switch (v) {
            case "-b":
            case "--beautify":
                options.codegen_options.beautify = true;
                break;
            case "-i":
            case "--indent":
                options.codegen_options.indent_level = args.shift();
                break;
            case "-q":
            case "--quote-keys":
                options.codegen_options.quote_keys = true;
                break;
            case "-mt":
            case "--mangle-toplevel":
                options.mangle_toplevel = true;
                break;
            case "--no-mangle":
            case "-nm":
                options.mangle = false;
                break;
            case "--no-squeeze":
            case "-ns":
                options.squeeze = false;
                break;
            case "--no-seqs":
                options.make_seqs = false;
                break;
            case "--no-dead-code":
                options.dead_code = false;
                break;
            case "--no-copyright":
            case "-nc":
                options.show_copyright = false;
                break;
            case "-o":
            case "--output":
                options.output = args.shift();
                break;
            case "--overwrite":
                options.out_same_file = true;
                break;
            case "-v":
            case "--verbose":
                options.verbose = true;
                break;
            case "--ast":
                options.ast = true;
                break;
            case "--unsafe":
                options.unsafe = true;
                break;
            case "--max-line-len":
                options.max_line_length = parseInt(args.shift(), 10);
                break;
            case "--reserved-names":
                options.reserved_names = args.shift().split(",");
                break;
            case "-d":
            case "--define":
                 var defarg = args.shift();
                 try {
                     var defsym = function(sym) {
                             // KEYWORDS_ATOM doesn't include NaN or Infinity - should we check
                             // for them too ?? We don't check reserved words and the like as the
                             // define values are only substituted AFTER parsing
                             if (jsp.KEYWORDS_ATOM.hasOwnProperty(sym)) {
                                 throw "Don't define values for inbuilt constant '"+sym+"'";
                             }
                             return sym;
                         },
                         defval = function(v) {
                             if (v.match(/^"(.*)"$/) || v.match(/^'(.*)'$/)) {
                                 return [ "string", RegExp.$1 ];
                             }
                             else if (!isNaN(parseFloat(v))) {
                                 return [ "num", parseFloat(v) ];
                             }
                             else if (v.match(/^[a-z\$_][a-z\$_0-9]*$/i)) {
                                 return [ "name", v ];
                             }
                             else if (!v.match(/"/)) {
                                 return [ "string", v ];
                             }
                             else if (!v.match(/'/)) {
                                 return [ "string", v ];
                             }
                             throw "Can't understand the specified value: "+v;
                         };
                     if (defarg.match(/^([a-z_\$][a-z_\$0-9]*)(=(.*))?$/i)) {
                         var sym = defsym(RegExp.$1),
                             val = RegExp.$2 ? defval(RegExp.$2.substr(1)) : [ 'name', 'true' ];
                         options.defines[sym] = val;
                     }
                     else {
                         throw "The --define option expects SYMBOL[=value]";
                     }
                 } catch(ex) {
                     sys.print("ERROR: In option --define "+defarg+"\n"+ex+"\n");
                     process.exit(1);
                 }
                 break;
            case "--define-from-module":
                var defmodarg = args.shift(),
                    defmodule = require(defmodarg),
                    sym,
                    val;
                for (sym in defmodule) {
                    if (defmodule.hasOwnProperty(sym)) {
                        options.defines[sym] = function(val) {
                            if (typeof val == "string")
                                return [ "string", val ];
                            if (typeof val == "number")
                                return [ "num", val ];
                            if (val === true)
                                return [ 'name', 'true' ];
                            if (val === false)
                                return [ 'name', 'false' ];
                            if (val === null)
                                return [ 'name', 'null' ];
                            if (val === undefined)
                                return [ 'name', 'undefined' ];
                            sys.print("ERROR: In option --define-from-module "+defmodarg+"\n");
                            sys.print("ERROR: Unknown object type for: "+sym+"="+val+"\n");
                            process.exit(1);
                            return null;
                        }(defmodule[sym]);
                    }
                }
                break;
            case "--ascii":
                options.codegen_options.ascii_only = true;
                break;
            default:
                filename = v;
                break out;
        }
}

if (options.verbose) {
        pro.set_logger(function(msg){
                sys.debug(msg);
        });
}

jsp.set_logger(function(msg){
        sys.debug(msg);
});

if (filename) {
        fs.readFile(filename, "utf8", function(err, text){
                if (err) throw err;
                output(squeeze_it(text));
        });
} else {
        var stdin = process.openStdin();
        stdin.setEncoding("utf8");
        var text = "";
        stdin.on("data", function(chunk){
                text += chunk;
        });
        stdin.on("end", function() {
                output(squeeze_it(text));
        });
}

function output(text) {
        var out;
        if (options.out_same_file && filename)
                options.output = filename;
        if (options.output === true) {
                out = process.stdout;
        } else {
                out = fs.createWriteStream(options.output, {
                        flags: "w",
                        encoding: "utf8",
                        mode: 0644
                });
        }
        out.write(text);
        if (options.output !== true) {
                out.end();
        }
};

// --------- main ends here.

function show_copyright(comments) {
        var ret = "";
        for (var i = 0; i < comments.length; ++i) {
                var c = comments[i];
                if (c.type == "comment1") {
                        ret += "//" + c.value + "\n";
                } else {
                        ret += "/*" + c.value + "*/";
                }
        }
        return ret;
};

function squeeze_it(code) {
        var result = "";
        if (options.show_copyright) {
                var tok = jsp.tokenizer(code), c;
                c = tok();
                result += show_copyright(c.comments_before);
        }
        try {
                var ast = time_it("parse", function(){ return jsp.parse(code); });
                if (options.mangle) ast = time_it("mangle", function(){
                        return pro.ast_mangle(ast, {
                                toplevel: options.mangle_toplevel,
                                defines: options.defines,
                                except: options.reserved_names
                        });
                });
                if (options.squeeze) ast = time_it("squeeze", function(){
                        ast = pro.ast_squeeze(ast, {
                                make_seqs  : options.make_seqs,
                                dead_code  : options.dead_code,
                                keep_comps : !options.unsafe
                        });
                        if (options.unsafe)
                                ast = pro.ast_squeeze_more(ast);
                        return ast;
                });
                if (options.ast)
                        return sys.inspect(ast, null, null);
                result += time_it("generate", function(){ return pro.gen_code(ast, options.codegen_options) });
                if (!options.codegen_options.beautify && options.max_line_length) {
                        result = time_it("split", function(){ return pro.split_lines(result, options.max_line_length) });
                }
                return result;
        } catch(ex) {
                sys.debug(ex.stack);
                sys.debug(sys.inspect(ex));
                sys.debug(JSON.stringify(ex));
        }
};

function time_it(name, cont) {
        if (!options.verbose)
                return cont();
        var t1 = new Date().getTime();
        try { return cont(); }
        finally { sys.debug("// " + name + ": " + ((new Date().getTime() - t1) / 1000).toFixed(3) + " sec."); }
};