canvas+Math api versioning

gistfile1.txt

var demoSeasonDate = "2015/02"
(function() {
  var whiteListApi = function(methodNames) {
    var C = function(nativeObj) {
      this._nativeObj = nativeObj
    }
    methodNames.forEach(function(methodName) {
      C.prototype[methodName] = function() {
        return this._nativeObj[methodName].apply(this._nativeObj, arguments)
      }
    })
    return C
  }
  
  var Canvas2D2015_02 = whiteListApi([
    "canvas",
    "currentTransform",
    "direction",
    "fillStyle",
    "filter",
    "font",
    "globalAlpha",
    "globalCompositeOperation",
    "imageSmoothingEnabled",
    "lineCap",
    "lineDashOffset",
    "lineJoin",
    "lineWidth",
    "miterLimit",
    "shadowBlur",
    "shadowColor",
    "shadowOffsetX",
    "shadowOffsetY",
    "strokeStyle",
    "textAlign",
    "textBaseline",
    "addHitRegion",
    "arc",
    "arcTo",
    "asyncDrawXULElement",
    "beginPath",
    "bezierCurveTo",
    "clearHitRegions",
    "clearRect",
    "clip",
    "closePath",
    "createImageData",
    "createLinearGradient",
    "createPattern",
    "createRadialGradient",
    "drawFocusIfNeeded",
    "drawImage",
    "drawWindow",
    "ellipse",
    "fill",
    "fillRect",
    "fillText",
    "getImageData",
    "getLineDash",
    "isPointInPath",
    "isPointInStroke",
    "lineTo",
    "measureText",
    "moveTo",
    "putImageData",
    "quadraticCurveTo",
    "rect",
    "removeHitRegion",
    "resetTransform",
    "restore",
    "rotate",
    "save",
    "scale",
    "scrollPathIntoView",
    "setLineDash",
    "setTransform",
    "stroke",
    "strokeRect",
    "strokeText",
    "transform",
    "translate",
  ])
  
  var nativeGetContext = HTMLCanvasElement.prototype.getContext
  HTMLCanvasElement.prototype.getContext = function(name) {
    if(name == "2d") {
      var nativeCanvas2dContext = nativeGetContext.apply(this, [name])
      return new ({ 
        "2010": Canvas2d2010Original, 
        "2010XMas": Canvas2d2010XMas, 
        "2011XMas": Canvas2d2010XMas, 
        "2013/02": Canvas2D2013_02
        "2015/02": Canvas2D2015_02
      }[demoSeasonDate] || console.assert(false, "Unsupported demoSeasonDate", demoSeasonDate))(nativeCanvas2dContext)
    }
  }
})()

var genSetFromList = function(list) {
  return list
}
var excludeSet = function(from, what) {
  return from.filter(function(v) {
    return what.indexOf(v) != -1
  })
}

if(null) {
  
}
else if(demoSeasonDate == "2010/05") {
  excludeSet(genSetFromList(Object.getOwnPropertyNames(Math)), genSetFromList([
    "E", 
    "LN10", 
    "LN2", 
    "LOG10E", 
    "LOG2E", 
    "PI", 
    "SQRT1_2", 
    "SQRT2", 
    "abs", 
    "acos", 
    "asin", 
    "atan", 
    "atan2", 
    "ceil", 
    "cos", 
    "exp", 
    "floor", 
    "log", 
    "max", 
    "min", 
    "pow", 
    "random", 
    "round", 
    "sin", 
    "sqrt", 
    "tan", 
  ])).forEach(function(i) {
    delete(Math[i])
  })
  
}


with((function() {
  var getNativeObject = function(v) {
    return v.toString._nativeObj
  }
  
  return hideNewApi({
    "2010/05": {
      //# [https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math$revision/89519]
      Math: {
        E: Math.E, 
        LN10: Math.LN10, 
        LN2: Math.LN2, 
        LOG10E: Math.LOG10E, 
        LOG2E: Math.LOG2E, 
        PI: Math.PI, 
        SQRT1_2: SQRT1_2, 
        SQRT2: SQRT2,
        abs: Math.abs, 
        acos: Math.acos, 
        asin: Math.asin, 
        atan: Math.atan, 
        atan2: Math.atan2, 
        ceil: Math.ceil, 
        cos: Math.cos, 
        exp: Math.exp, 
        floor: Math.floor, 
        log: Math.log, 
        max: Math.max, 
        min: Math.min, 
        pow: Math.pow, 
        random: Math.random, 
        round: Math.round, 
        sin: Math.sin, 
        sqrt: Math.sqrt, 
        tan: Math.tan 
      }
    }, 
    "2010/11": {
      //# [https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math$revision/89519]
      Math: {
        E: Math.E, 
        LN10: Math.LN10, 
        LN2: Math.LN2, 
        LOG10E: Math.LOG10E, 
        LOG2E: Math.LOG2E, 
        PI: Math.PI, 
        SQRT1_2: SQRT1_2, 
        SQRT2: SQRT2,
        abs: Math.abs, 
        acos: Math.acos, 
        asin: Math.asin, 
        atan: Math.atan, 
        atan2: Math.atan2, 
        ceil: Math.ceil, 
        cos: Math.cos, 
        exp: Math.exp, 
        floor: Math.floor, 
        log: Math.log, 
        max: Math.max, 
        min: Math.min, 
        pow: Math.pow, 
        random: Math.random, 
        round: Math.round, 
        sin: Math.sin, 
        sqrt: Math.sqrt, 
        tan: Math.tan 
      }
    }, 
    "2011/03": {
      //# [https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math$revision/89519]
      Math: {
        E: Math.E, 
        LN10: Math.LN10, 
        LN2: Math.LN2, 
        LOG10E: Math.LOG10E, 
        LOG2E: Math.LOG2E, 
        PI: Math.PI, 
        SQRT1_2: SQRT1_2, 
        SQRT2: SQRT2,
        abs: Math.abs, 
        acos: Math.acos, 
        asin: Math.asin, 
        atan: Math.atan, 
        atan2: Math.atan2, 
        ceil: Math.ceil, 
        cos: Math.cos, 
        exp: Math.exp, 
        floor: Math.floor, 
        log: Math.log, 
        max: Math.max, 
        min: Math.min, 
        pow: Math.pow, 
        random: Math.random, 
        round: Math.round, 
        sin: Math.sin, 
        sqrt: Math.sqrt, 
        tan: Math.tan 
      }
    }, 
    "2012/02": {
      //# [https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math$revision/89523]
      Math: {
        E: Math.E, 
        LN10: Math.LN10, 
        LN2: Math.LN2, 
        LOG10E: Math.LOG10E, 
        LOG2E: Math.LOG2E, 
        PI: Math.PI, 
        SQRT1_2: SQRT1_2, 
        SQRT2: SQRT2,
        abs: Math.abs, 
        acos: Math.acos, 
        asin: Math.asin, 
        atan: Math.atan, 
        atan2: Math.atan2, 
        ceil: Math.ceil, 
        cos: Math.cos, 
        exp: Math.exp, 
        floor: Math.floor, 
        log: Math.log, 
        max: Math.max, 
        min: Math.min, 
        pow: Math.pow, 
        random: Math.random, 
        round: Math.round, 
        sin: Math.sin, 
        sqrt: Math.sqrt, 
        tan: Math.tan 
      }
    }, 
    "2013/02": {
      //# [https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math$revision/340119]
      Math: {
        E: Math.E, 
        LN10: Math.LN10, 
        LN2: Math.LN2, 
        LOG10E: Math.LOG10E, 
        LOG2E: Math.LOG2E, 
        PI: Math.PI, 
        SQRT1_2: SQRT1_2, 
        SQRT2: SQRT2,
        abs: Math.abs, 
        acos: Math.acos, 
        asin: Math.asin, 
        atan: Math.atan, 
        atan2: Math.atan2, 
        ceil: Math.ceil, 
        cos: Math.cos, 
        exp: Math.exp, 
        floor: Math.floor, 
        log: Math.log, 
        max: Math.max, 
        min: Math.min, 
        pow: Math.pow, 
        random: Math.random, 
        round: Math.round, 
        sin: Math.sin, 
        sqrt: Math.sqrt, 
        tan: Math.tan 
      }
    }, 
    "2014/02": {
      //# [https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math$revision/485197]
      Math: {
        E: Math.LN2, 
        LN2: Math.LN2, 
        LN10: Math.LN10, 
        LOG2E: Math.LOG2E, 
        LOG10E: Math.LOG10E, 
        PI: Math.PI, 
        SQRT1_2: Math.SQRT1_2, 
        SQRT2: Math.SQRT2,
        abs: Math.abs, 
        acos: Math.acos, 
        acosh: Math.acosh, 
        asin: Math.asin, 
        asinh: Math.asinh, 
        atan: Math.atan, 
        atanh: Math.atanh, 
        atan2: Math.atan2, 
        cbrt: Math.cbrt, 
        ceil: Math.ceil, 
        cos: Math.cos, 
        cosh: Math.cosh, 
        exp: Math.exp, 
        expm1: Math.expm1, 
        floor: Math.floor, 
        fround: Math.fround, 
        hypot: Math.hypot, 
        imul: Math.imul, 
        log: Math.log, 
        log1p: Math.log1p, 
        log10: Math.log10, 
        log2: Math.log2, 
        max: Math.max, 
        min: Math.min, 
        pow: Math.pow, 
        random: Math.random, 
        round: Math.round, 
        sign: Math.sign, 
        sin: Math.sin, 
        sinh: Math.sinh, 
        sqrt: Math.sqrt, 
        tan: Math.tan, 
        tanh: Math.tanh, 
        trunc: Math.trunc
      }
    }, 
    "2015/02": {
      //# [https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math$revision/719777]
      Math: {
        E: Math.E, 
        LN10: Math.LN10, 
        LN2: Math.LN2, 
        LOG10E: Math.LOG10E, 
        LOG2E: Math.LOG2E, 
        PI: Math.PI, 
        SQRT1_2: Math.SQRT1_2, 
        SQRT2: Math.SQRT2,
        abs: Math.abs, 
        acos: Math.acos, 
        acosh: Math.acosh, 
        asin: Math.asin, 
        asinh: Math.asinh, 
        atan: Math.atan, 
        atanh: Math.atanh, 
        atan2: Math.atan2, 
        cbrt: Math.cbrt, 
        ceil: Math.ceil, 
        clz32: Math.clz32, 
        cos: Math.cos, 
        cosh: Math.cosh, 
        exp: Math.exp, 
        expm1: Math.expm1, 
        floor: Math.floor, 
        fround: Math.fround, 
        hypot: Math.hypot, 
        imul: Math.imul, 
        log: Math.log, 
        log1p: Math.log1p, 
        log10: Math.log10, 
        log2: Math.log2, 
        max: Math.max, 
        min: Math.min, 
        pow: Math.pow, 
        random: Math.random, 
        round: Math.round, 
        sign: Math.sign, 
        sin: Math.sin, 
        sinh: Math.sinh, 
        sqrt: Math.sqrt, 
        tan: Math.tan, 
        tanh: Math.tanh, 
        trunc: Math.trunc
      }
    }
  })
})())