path: root/bin/uglifyjs2

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

"use strict";

var UglifyJS = require("../tools/node");
var sys = require("util");
var optimist = require("optimist");
var fs = require("fs");
var ARGS = optimist
    .usage("$0 [options] input1.js [input2.js ...]\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/specify output options.")
    .describe("m", "Mangle names/pass mangler options.")
    .describe("c", "Enable compressor/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("m", "mangle")
    .alias("c", "compress")

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

    .wrap(80)

    .argv
;

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

normalize(ARGS);

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

function getOptions(x) {
    x = ARGS[x];
    if (!x) return null;
    var ret = {};
    if (x !== true) {
        x.replace(/^\s+|\s+$/g).split(/\s*,+\s*/).forEach(function(opt){
            var a = opt.split(/\s*[=:]\s*/);
            ret[a[0]] = a.length > 1 ? new Function("return(" + a[1] + ")")() : true;
        });
        normalize(ret)
    }
    return ret;
}

var COMPRESS = getOptions("c");
var MANGLE = getOptions("m");
var BEAUTIFY = getOptions("b");

var OUTPUT_OPTIONS = {
    beautify: BEAUTIFY ? true : false
};
if (BEAUTIFY)
    UglifyJS.merge(OUTPUT_OPTIONS, BEAUTIFY);

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;

OUTPUT_OPTIONS.source_map = SOURCE_MAP;

try {
    var output = UglifyJS.OutputStream(OUTPUT_OPTIONS);
    var compressor = COMPRESS && UglifyJS.Compressor(COMPRESS);
} catch(ex) {
    if (ex instanceof UglifyJS.DefaultsError) {
        sys.error(ex.msg);
        sys.error("Supported options:");
        sys.error(sys.inspect(ex.defs));
        process.exit(1);
    }
}

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
        });
    });
});

var SCOPE_IS_NEEDED = COMPRESS || MANGLE;

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

if (COMPRESS) {
    time_it("squeeze", function(){
        TOPLEVEL = TOPLEVEL.transform(compressor);
    });
}

if (SCOPE_IS_NEEDED) {
    time_it("scope", function(){
        TOPLEVEL.figure_out_scope();
        if (MANGLE) {
            TOPLEVEL.compute_char_frequency();
            UglifyJS.base54.sort();
        }
    });
}

if (MANGLE) time_it("mangle", function(){
    TOPLEVEL.mangle_names(MANGLE);
});
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;
};