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酩酊状態で書いたエンジニアポエムです。酩酊状態で読んでください。

ClosureCompiler API でMinifyする

(ε・◇・)з o O ( SIMPLE_OPTIMIZATIONS の基本的な使い方だよ。

// ClosureCompiler.js: JavaScript source code minifier
//
// Closure Compiler Service API Reference:
//  https://developers.google.com/closure/compiler/docs/gettingstarted_api?hl=ja
//  https://developers.google.com/closure/compiler/docs/api-ref
//
// Closure Compiler Service
//  http://closure-compiler.appspot.com/home
//
(function(global) {

// --- header ----------------------------------------------
function ClosureCompiler() {
}
ClosureCompiler.name = "ClosureCompiler";
ClosureCompiler.minify = minify; // minify(js:String, fn:Function):void

// --- library scope vars ----------------------------------

// --- implement -------------------------------------------
function minify(js,   // @arg String: js expression
                fn) { // @arg Function: fn(err:Error, result:String)

    var http = require("http");
    var option = {
            hostname: "closure-compiler.appspot.com",
            path:     "/compile",
            port:     80,
            method:   "POST"
        };

    var req = http.request(option, function(res) {
      //console.log("STATUS: " + res.statusCode);
      //console.log("HEADERS: " + JSON.stringify(res.headers));

        if (res.statusCode !== 200) {
            fn(new TypeError(res.statusCode), "");
            return;
        }
        var data = "";

        res.on("data", function(chunk) { data += chunk; });
        res.on("end", function() {
            var json = eval("(" + data + ")");
            var minified = json.compiledCode;

            if (json.errors) {
                console.log("ERR: " + JSON.stringify(json.errors, "", 2));
            }
            if (json.warnings) {
                console.log("WARN: " + JSON.stringify(json.warnings, "", 2));
            }
            fn(null, minified);
        });
    });

    req.setHeader("Content-Type", "application/x-www-form-urlencoded");
    req.on("error", function(event) {
        console.log("problem with request: " + event.message);
        fn(new TypeError(event.message), "");
    });

    var requestParameters = [
            "output_format=json",
            "output_info=compiled_code",
            "output_info=warnings",
            "output_info=errors",
            "output_info=statistics",
            "compilation_level=SIMPLE_OPTIMIZATIONS",
            "warning_level=default",
            "js_code=" + encodeURIComponent(js)
        ];

    req.end(requestParameters.join("&"), "utf8");
}

// --- build -----------------------------------------------

// --- export ----------------------------------------------
if (typeof module !== "undefined") {
    module.exports = { ClosureCompiler: ClosureCompiler };
} else {
    global.ClosureCompiler = ClosureCompiler;
}

})(this.self || global);