build

#!/usr/bin/env node
"use strict";

var fs = require('fs');
var assert = require('assert');
var uglifyjs = require('uglify-js');
var cheerio = require('cheerio');
var hasOwn = Object.prototype.hasOwnProperty;

var devMode = ~process.argv.indexOf('--dev');

// generally a really bad idea, but a fun experiment.
var obscure = {
  // textures:
  'wrap':'u', 'opaque':'o', 'width':'w', 'height':'h',
  // frames:
  'iofs':'a', 'inum':'b',
  // entities: (AVOID 'x' and 'y')
  'onground':'g', 'onrope':'r', 'frames':'f', 'tex':'t', 'anim':'a', 'animOfs':'b', 'animTr':'c',
  'geom':'e', 'mins':'i', 'maxs':'j', 'pos':'k', 'speed':'s', 'update':'u', 'flip':'l',
  'walkAnim':'w', 'walkIdle':'m', 'climbAnim':'n', 'climbIdle':'o', 'jumpAnim':'p',
  'accX':'q', 'accY':'v', 'velX':'h', 'velY':'d', 'jumpHeld':'z', 'is_rope':'A',
  'climbing':'B', 'lastDmg':'C', 'is_enemy':'D', 'health':'E', 'color':'F', 'thread':'G',
  // geometry:
  'draw':'H',
  // hit-test:
  'hitL':'a','hitR':'b','hitB':'c','hitT':'d','ladder':'e','pain':'f',
};

// minify HTML and inline CSS.
var $ = cheerio.load(read('web/index.html'), devMode?{}:{ignoreWhitespace:true});
$('style').each(function (i,elem) {
  assert(elem.children && elem.children[0] && elem.children[0].type == 'text');
  elem.children[0].data = minCSS(elem.children[0].data);
});

// minify the loader and insert at the end of the document.
var loader = minify(wrap(read('web/loader.js')));
$('body').append('<script>'+loader+'</script>');

// write the static web files.
fs.writeFileSync('out/index.html', $.html(), 'utf8');

// copy the logo image.
copy('out/esme.png', 'web/esme.png');

// read and minify shaders.
var shaders = 'var ShaderLibrary='+JSON.stringify({
  vertex:   norm_ws(read('src/shader.vertex', 'utf8')),
  fragment: norm_ws(read('src/shader.fragment', 'utf8')),
})+';\n';

// write the game-server data files.
write('gen/game.js', minify(wrap(
  '"use strict";\n' +
  shaders +
  untrace(concat([
    'src/raf-shim.js',
    'src/defs.js',
    'src/cache.js',
    'src/audio.js',
    'src/controls.js',
    'src/glr.js',
    'src/geom.js',
    'src/engine.js',
    'src/images.js',
    'src/spawn.js',
    'src/start.js'
  ]))
)));

function minify(text) {
  if (devMode) return text;
  if (1) {
    // obscure object fields (closure compiler kind of thing)
    text = text.replace(/\.[A-Za-z_]+\b/g, function (word) { word=word.substring(1); return '.' + (hasOwn.call(obscure,word) ? obscure[word] : word); });
    text = text.replace(/\b[A-Za-z_]+:/g, function (word) { word=word.substring(0,word.length-1); return (hasOwn.call(obscure,word) ? obscure[word] : word) + ':'; });
  }
  return uglifyjs.minify(text, {fromString:true}).code; // TODO: outSourceMap
}

function untrace(text) {
  if (devMode) return text;
  return text.replace(/\btrace\([^\)]+\);/g,';');
}

function concat(files) { return files.map(read).join('\n;'); }
function read(from) { return fs.readFileSync(from, 'utf8'); }
function write(to, text) { fs.writeFileSync(to, text, 'utf8'); }
function copy(to, from) { fs.writeFileSync(to, fs.readFileSync(from)); }
function norm_ws(text) { return text.replace(/[ \t]+/g,' ').replace(/\n\s*/g,'\n'); }
function wrap(text) { return '(function(){\n' + text + '\n})()'; }

function minCSS(css) {
  return css.replace(/\s+{/g, '{')
            .replace(/{\s+/g, '{')
            .replace(/\s+}/g, '}')
            .replace(/}\s+/g, '}')
            .replace(/:\s+/g, ':')
            .replace(/;\s+/g, ';')
            .replace(/,\s+/g, ',')
            .replace(/;}/g, '}');
}