Osu! Storyboard Generation Language (SGL) in pure JavaScript implementation. The code has assumed the interpreter has a print function defined as "print(text)". Reference: http://moonshadow.hostbeef.com/sgl/ and http://osu.ppy.sh/wiki/Storyboard_Scripting

SGL.js

/**
    Osu! Storyboard Generation Language (SGL) in pure JavaScript implementaion
    Copyright (C) 2013, Jeremy Lam [JLChnToZ]

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
    
    The code has assumed the interpreter has a print function defined as "print(text)".
    Reference: http://moonshadow.hostbeef.com/sgl/ and http://osu.ppy.sh/wiki/Storyboard_Scripting
*/
// Layer enums
var Background = "Background", Fail = "Fail"
  Pass = "Pass", Foreground = "Foreground";
// Origin enums
var TopLeft = "TopLeft", TopCentre = "TopCentre", TopRight = "TopRight",
  CentreLeft = "CentreLeft", Centre = "Centre", CentreRight = "CentreRight",
  BottomLeft = "BottomLeft", BottomCentre = "BottomCentre", BottomRight = "BottomRight";
// Loop enums
var LoopForever = "LoopForever", LoopOnce = "LoopOnce";
var output = new Array();
// SGL Only Functions
function println(text) {
  return print(text+"\n");
}
function rand(min, max) {
  return Math.round(Math.random()*(max-min)+min);
}
function sin(number) {
  return Math.sin(number);
}
// Sprite Constructor
function Sprite() {
  this.sequence = new Array();
  var _args = new Array();
  var _type = "Sprite", _layer = Foreground, _origin = Centre, _x = 320, _y = 240,
    _filepath = arguments[0], _framecount = 0, _framedelay = 0, _looptype = LoopForever;
  switch(arguments.length) {
    case 1:
      break;
    case 2:
      _layer = arguments[1];
      break;
    case 3:
      if(typeof arguments[1] == "string") {
        _layer = arguments[1];
        _origin = arguments[2];
      } else {
        _type = "Animation";
        _framecount = arguments[1];
        _framedelay = arguments[2];
      }
      break;
    case 4:
      _type = "Animation";
      _layer = arguments[1];
      _framecount = arguments[2];
      _framedelay = arguments[3];
      break;
    case 5:
      _type = "Animation";
      _layer = arguments[1];
      _origin = arguments[2];
      _framecount = arguments[3];
      _framedelay = arguments[4];
      break;
    case 6:
      _type = "Animation";
      _layer = arguments[1];
      _origin = arguments[2];
      _framecount = arguments[3];
      _framedelay = arguments[4];
      _looptype = arguments[5];
      break;
  }
  _args.push(_type, _layer, _origin, '"'+_filepath+'"', _x, _y);
  if(_type == "Animation")
    _args.push(_framecount, _framedelay, _looptype);
  this.sequence.push(_args);
  this.move = function() {
    _pushevent.call(this, "_M", 2, arguments);
  };
  this.moveX = function() {
    _pushevent.call(this, "_MX", 1, arguments);
  };
  this.moveY = function() {
    _pushevent.call(this, "_MY", 1, arguments);
  };
  this.scale = function() {
    _pushevent.call(this, "_S", 1, arguments);
  };
  this.scaleVec = function() {
    _pushevent.call(this, "_V", 2, arguments);
  };
  this.rotate = function() {
    _pushevent.call(this, "_R", 1, arguments);
  };
  this.fade = function() {
    _pushevent.call(this, "_F", 1, arguments);
  };
  this.color = function() {
    _pushevent.call(this, "_C", 3, arguments);
  };
  function _pushevent(type, pcount, args) {
    var i = 0, _easing = 0, _stime = 0, _etime = 0,
      _p1 = new Array(), _p2 = new Array(), _ev = new Array(type);
    switch(args.length) {
      case pcount:
        for(i = 0; i < pcount; i++) {
          _p1.push(args[i]);
          _p2.push(args[i]);
        }
        break;
      case pcount+1:
        _stime = _etime = args[0];
        for(i = 1; i < pcount+1; i++) {
          _p1.push(args[i]);
          _p2.push(args[i]);
        }
        break;
      case pcount*2+2:
        _stime = args[0];
        _etime = args[1];
        for(i = 2; i < pcount+2; i++)
          _p1.push(args[i]);
        for( ; i < pcount*2+2; i++)
          _p2.push(args[i]);
        break;
      case pcount*2+3:
        _easing = args[0];
        _stime = args[1];
        _etime = args[2];
        for(i = 3; i < pcount+3; i++)
          _p1.push(args[i]);
        for( ; i < pcount*2+3; i++)
          _p2.push(args[i]);
        break;
    }
    _ev.push(_easing, _stime, _etime);
    for(i = 0; i < _p1.length; i++)
      _ev.push(_p1[i]);
    for(i = 0; i < _p2.length; i++)
      _ev.push(_p2[i]);
    this.sequence.push(_ev);
  }
  if(arguments.length > 0)
    output.push(this);
}
// Animation Constructor
function Animation() {}
Animation = Sprite;
// Function for outputting the result
function generate() {
  return "[Events]\n\n"+
    "//Background and Video events\n"+
    "//Storyboard Layer 0 (Background)\n"+
    generatePart(Background)+
    "//Storyboard Layer 1 (Fail)\n"+
    generatePart(Fail)+
    "//Storyboard Layer 2 (Pass)\n"+
    generatePart(Pass)+
    "//Storyboard Layer 3 (Foreground)\n"+
    generatePart(Foreground)+
    "//Storyboard Sound Samples\n";
    // TODO: Implement SE generation script and finish this part.
}
function generatePart(LayerType) {
  var s = "";
  for(var i = 0; i < output.length; i++) {
    if(LayerType != "" && output[i].sequence[0][1] != LayerType)
      continue;
    for(var j = 0; j < output[i].sequence.length; j++) {
      for(var k = 0; k < output[i].sequence[j].length; k++) {
        if(k != 0)
          s += ",";
        s += output[i].sequence[j][k];
      }
      s += "\n";
    }
  }
  return s;
}
//
// Put Your Storyboard Generation Language Code Here:
//



// Please do not remove the lines below!
print("\n\n----------------------------------------\n\n");
print(generate());