jeefo-preprocessor/src/index.js

GCC preprocessor

/* -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.
* File Name   : index.js
* Created at  : 2017-04-07
* Updated at  : 2017-04-07
* Author      : jeefo
* Purpose     :
* Description :
_._._._._._._._._._._._._._._._._._._._._.*/
//ignore:start
"use strict";

/* global */
/* exported */
/* exported */

//ignore:end

var path  = require("path"),
	spawn = require("child_process").spawn;

var GCCPreprocessor = function (filepath) {
	this.args     = ["-E", "-P", "-x", 'c', "-imacros", this.MACROS_PATH, filepath];
	this.error    = '';
	this.result   = '';
	this.filepath = filepath;
};

GCCPreprocessor.prototype = {
	MACROS_PATH : path.join(__dirname, "js_macros.h"),

	process : function (callback) {
		var instance  = this,
			processor = spawn("gcc", instance.args);

		processor.stdout.on("data", function (buffer) {
			instance.result += buffer.toString("utf8", 0, buffer.length - 1); 
		});
		processor.stderr.on("data", function (buffer) {
			instance.error += buffer.toString(); 
		});
		processor.on("close", function (exit_code) {
			if (exit_code === 0) {
				callback(null, instance.result);
			} else {
				callback(instance.error);
			}
		});
	}
};

module.exports = function (filepath, callback) {
	var preprocessor = new GCCPreprocessor(filepath);
	preprocessor.process(callback);
};