UglifyJS/bin/uglifyjs2

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

var UglifyJS = require("../tools/node");
var sys = require("util");
var optimist = require("optimist");
var fs = require("fs");
var ARGS = optimist
    .usage("uglifyjs2 [options] input1.js [input2.js ...]\n\
Maximum compression settings are on by default.\n\
Use a single dash to read input from the standard input.\
")
    .describe("source-map", "Specify an output file where to generate source map.")
    .describe("source-map-root", "The path to the original source to be included in the source map.")
    .describe("in-source-map", "Input source map, useful if you're compressing JS that was generated from some other original code.")
    .describe("p", "Skip prefix for original filenames that appear in source maps. For example -p 3 will drop 3 directories from file names and ensure they are relative paths.")
    .describe("o", "Output file (default STDOUT)")
    .describe("b", "Beautify output")
    .describe("m", "Don't mangle names")
    .describe("c", "Disable compressor, or pass compressor options. \
Pass options like -c hoist_vars=false,if_return=false. \
Use -c with no argument if you want to disable the squeezer entirely")

    .describe("stats", "Display operations run time on STDERR")
    .describe("v", "Verbose")

    .alias("p", "prefix")
    .alias("o", "output")
    .alias("v", "verbose")
    .alias("b", "beautify")
    .alias("c", "options")
    .alias("m", "no-mangle")

    .boolean("b")
    .boolean("v")
    .boolean("stats")
    .boolean("m")
    .string("c")

    .wrap(80)

    .argv
;

function normalize(o) {
    for (var i in o) if (o.hasOwnProperty(i) && /-/.test(i)) {
        o[i.replace(/-/g, "_")] = o[i];
    }
}

normalize(ARGS);

if (ARGS.h || ARGS.help) {
    sys.puts(optimist.help());
    process.exit(0);
}

var COMPRESSOR_OPTIONS = {};
if (ARGS.c && ARGS.c !== true) {
    ARGS.c.replace(/^\s+|\s+$/g).split(/\s*,+\s*/).forEach(function(opt){
        var a = opt.split(/\s*=\s*/);
        COMPRESSOR_OPTIONS[a[0]] = new Function("return(" + a[1] + ")")();
    });
    normalize(COMPRESSOR_OPTIONS);
}

var files = ARGS._.slice();

var ORIG_MAP = ARGS.in_source_map;

if (ORIG_MAP) {
    ORIG_MAP = JSON.parse(fs.readFileSync(ORIG_MAP));
    if (files.length == 0) {
        sys.error("INFO: Using file from the input source map: " + ORIG_MAP.file);
        files = [ ORIG_MAP.file ];
    }
    if (ARGS.source_map_root == null) {
        ARGS.source_map_root = ORIG_MAP.sourceRoot;
    }
}

if (files.length == 0) {
    files = [ "-" ];
}

if (files.indexOf("-") >= 0 && ARGS.source_map) {
    sys.error("ERROR: Source map doesn't work with input from STDIN");
    process.exit(1);
}

if (files.filter(function(el){ return el == "-" }).length > 1) {
    sys.error("ERROR: Can read a single file from STDIN (two or more dashes specified)");
    process.exit(1);
}

var STATS = {};
var OUTPUT_FILE = ARGS.o;
var TOPLEVEL = null;

var SOURCE_MAP = ARGS.source_map ? UglifyJS.SourceMap({
    file: OUTPUT_FILE,
    root: ARGS.source_map_root,
    orig: ORIG_MAP,
}) : null;

var output = UglifyJS.OutputStream({
    beautify: ARGS.b,
    source_map: SOURCE_MAP
});

files.forEach(function(file) {
    var code = read_whole_file(file);
    if (ARGS.p != null) {
        file = file.replace(/^\/+/, "").split(/\/+/).slice(ARGS.p).join("/");
    }
    time_it("parse", function(){
        TOPLEVEL = UglifyJS.parse(code, {
            filename: file,
            toplevel: TOPLEVEL
        });
    });
});

time_it("scope", function(){
    TOPLEVEL.figure_out_scope();
});

if (ARGS.c !== true) {
    time_it("squeeze", function(){
        var compressor = UglifyJS.Compressor(COMPRESSOR_OPTIONS);
        TOPLEVEL = TOPLEVEL.squeeze(compressor);
    });
}

time_it("scope", function(){
    TOPLEVEL.figure_out_scope();
    if (!ARGS.m) {
        TOPLEVEL.compute_char_frequency();
        UglifyJS.base54.sort();
    }
});

if (!ARGS.m) time_it("mangle", function(){
    TOPLEVEL.mangle_names();
});
time_it("generate", function(){
    TOPLEVEL.print(output);
});

output = output.get();

if (SOURCE_MAP) {
    fs.writeFileSync(ARGS.source_map, SOURCE_MAP, "utf8");
    output += "\n//@ sourceMappingURL=" + ARGS.source_map;
}

if (OUTPUT_FILE) {
    fs.writeFileSync(OUTPUT_FILE, output, "utf8");
} else {
    sys.print(output);
    sys.error("\n");
}

if (ARGS.stats) {
    sys.error(UglifyJS.string_template("Timing information (compressed {count} files):", {
        count: files.length
    }));
    for (var i in STATS) if (STATS.hasOwnProperty(i)) {
        sys.error(UglifyJS.string_template("- {name}: {time}s", {
            name: i,
            time: (STATS[i] / 1000).toFixed(3)
        }));
    }
}

/* -----[ functions ]----- */

function read_whole_file(filename) {
    if (filename == "-") {
        // XXX: this sucks.  How does one read the whole STDIN
        // synchronously?
        filename = "/dev/stdin";
    }
    try {
        return fs.readFileSync(filename, "utf8");
    } catch(ex) {
        sys.error("ERROR: can't read file: " + filename);
        process.exit(1);
    }
}

function time_it(name, cont) {
    var t1 = new Date().getTime();
    var ret = cont();
    if (ARGS.stats) {
        var spent = new Date().getTime() - t1;
        if (STATS[name]) STATS[name] += spent;
        else STATS[name] = spent;
    }
    return ret;
};