path: root/public/assets/javascripts/util.js

if (window.$) {
  $.fn.int = function() { return parseInt($(this).val(),10) }
  $.fn.float = function() { return parseFloat($(this).val()) }
  $.fn.string = function() { return trim($(this).val()) }
  $.fn.enable = function() { return $(this).attr("disabled",null) }
  $.fn.disable = function() { return $(this).attr("disabled","disabled") }
  $.fn.sanitize = function(s) { return trim(sanitize($(this).val())) }
  $.fn.htmlSafe = function(s) { return $(this).html(sanitize(s)) }
}

function trim (s){ return s.replace(/^\s+/,"").replace(/\s+$/,"") }
function sanitize (s){ return (s || "").replace(new RegExp("[<>&]", 'g'), "") }
function stripHTML (s){ return (s || "").replace(/<[^>]+>/g, "") }
function capitalize (s){ return s.split(" ").map(capitalizeWord).join(" ") }
function capitalizeWord (s){ return s.charAt(0).toUpperCase() + s.slice(1) }
function slugify (s){ return (s || "").toLowerCase().replace(/\s/g,"-").replace(/[^-_a-zA-Z0-9]/g, '-').replace(/-+/g,"-") }
function rgb_string (rgb) { return "rgb(" + rgb.map(Math.round).join(",") + ")" }
function rgba_string (rgb,a) { return "rgba(" + rgb.map(Math.round).join(",") + "," + a + ")" }
function hex_string (rgb) { return "#" + rgb.map(Math.round).map(function(n){ var s = n.toString(16); return s.length == 1 ? "0"+s : s }).join("") }
function parse_rgba_string (s) { return s.match(/(\d+)/g).slice(0,3) }

var E = Math.E
var PI = Math.PI
var PHI = (1+Math.sqrt(5))/2
var TWO_PI = PI*2
var HALF_PI = PI/2
var LN10 = Math.LN10
function clamp(n,a,b){ return n<a?a:n<b?n:b }
function norm(n,a,b){ return (n-a) / (b-a) }
function lerp(n,a,b){ return (b-a)*n+a }
function mix(n,a,b){ return a*(1-n)+b*n }
function ceil(n){ return Math.ceil(n) }
function floor(n){ return Math.floor(n) }
function round(n){ return Math.round(n) }
function quantize(n,a){ return round(n / a) * a }
function max(a,b){ return Math.max(a,b) }
function min(a,b){ return Math.min(a,b) }
function abs(n){ return Math.abs(n) }
function sign(n){ return n ? Math.abs(n)/n : 0 }
function pow(n,b) { return Math.pow(n,b) }
function exp(n) { return Math.exp(n) }
function log(n){ return Math.log(n) }
function ln(n){ return Math.log(n)/LN10 }
function sqrt(n) { return Math.sqrt(n) }
function cos(n){ return Math.cos(n) }
function sin(n){ return Math.sin(n) }
function tan(n){ return Math.tan(n) }
function acos(n){ return Math.cos(n) }
function asin(n){ return Math.sin(n) }
function atan(n){ return Math.atan(n) }
function atan2(a,b){ return Math.atan2(a,b) }
function sec(n){ return 1/cos(n) }
function csc(n){ return 1/sin(n) }
function cot(n){ return 1/tan(n) }
function cosp(n){ return (1+Math.cos(n))/2 } // cos^2
function sinp(n){ return (1+Math.sin(n))/2 }
function random(){ return Math.random() }
function rand(n){ return (Math.random()*n) }
function randint(n){ return rand(n)|0 }
function randrange(a,b){ return a + rand(b-a) }
function choice(a){ return a[randint(a.length)] }
function deg(n){ return n*180/PI }
function rad(n){ return n*PI/180 }
function xor(a,b){ a=!!a; b=!!b; return (a||b) && !(a&&b) }
function mod(n,m){ return n-(m * floor(n/m)) }
function dist(x0,y0,x1,y1){ return sqrt(pow(x1-x0,2)+pow(y1-y0,2)) }
function angle(x0,y0,x1,y1){ return atan2(y1-y0,x1-x0) }
function avg(m,n,a){ return (m*(a-1)+n)/a }
function noop(){}

function pixel(x,y){ return 4*(mod(y,actual_h)*actual_w+mod(x,actual_w)) }
function rgbpixel(d,x,y){
  var p = pixel(~~x,~~y)
  r = d[p]
  g = d[p+1]
  b = d[p+2]
  a = d[p+3]
}
function fit(d,x,y){ rgbpixel(d,x*actual_w/w,y*actual_h/h) }

function step(a, b){
  return (b >= a) + 0 
               // ^^ bool -> int
}

function julestep (a,b,n) {
  return clamp(norm(n,a,b), 0.0, 1.0);
}

// hermite curve apparently
function smoothstep(min,max,n){
  var t = clamp((n - min) / (max - min), 0.0, 1.0);
  return t * t * (3.0 - 2.0 * t)
}

function shuffle(a){
  var r, swap
  for (var i = a.length; i > 0; i--){
    r = randint(i)
    swap = a[i-1]
    a[i-1] = a[r]
    a[r] = swap
  }
  return a
}
function reverse(a){
  var reversed = []
  for (var i = 0, _len = a.length-1; i <= _len; i++){
    reversed[i] = a[_len-i]
  }
  return reversed
}
function deinterlace(a){
  var odd = [], even = []
  for (var i = 0, _len = a.length; i < _len; i++) {
    if (i % 2) even.push(a[i])
    else odd.push(a[i])
  }
  return [even, odd]
}
function weave(a){
  var aa = deinterlace(a)
  var b = []
  aa[0].forEach(function(el){ b.push(el) })
  reverse(aa[1]).forEach(function(el){ b.push(el) })
  return b
}
function range(m,n,s){
	var a = []
	s = s || 1
	for (var i = m; i <= n; i += s) {
		a.push(i)
	}
	return a
}

var guid_syllables = "iz az ez or iv ex baz el lo lum ot un no".split(" ")
var guid_n = 0
function guid(n){
	var len = guid_syllables.length
	return ((++guid_n*(len-1)*(~~log(guid_n))).toString(len)).split("").map(function(s){
		return guid_syllables[parseInt(s, len) % len--]
	}).join("")
}

function defaults (dest, src) {
	dest = dest || {}
	for (var i in src) {
		dest[i] = typeof dest[i] == 'undefined' ? src[i] : dest[i]
	}
	return dest
}

// Change straight quotes to curly and double hyphens to em-dashes.
function smarten(a) {
  a = a.replace(/(^|[-\u2014\s(\["])'/g, "$1\u2018");       // opening singles
  a = a.replace(/'/g, "\u2019");                            // closing singles & apostrophes
  a = a.replace(/(^|[-\u2014/\[(\u2018\s])"/g, "$1\u201c"); // opening doubles
  a = a.replace(/"/g, "\u201d");                            // closing doubles
  a = a.replace(/--/g, "\u2014");                           // em-dashes
  return a
};


function pairs(h){
	var a = []
	for (var i in h) {
		if(h.hasOwnProperty(i)) {
			a.push([i, h[i]])
		}
	}
	return a
}
function invert_hash (h) {
	var k = {}
	for (var i in h) { if (h.hasOwnProperty(i)) k[h[i]] = i }
	return k
}
function filenameFromUrl (url) {
  var partz = url.split( "/" )
  return partz[partz.length-1].split(".")[0]
}

function bitcount(v) {
  v = v - ((v >>> 1) & 0x55555555);
  v = (v & 0x33333333) + ((v >>> 2) & 0x33333333);
  return ((v + (v >>> 4) & 0xF0F0F0F) * 0x1010101) >>> 24;
}

// Function.bind polyfill
if (!Function.prototype.bind) {
  Function.prototype.bind = function(oThis) {
    if (typeof this !== 'function') {
      // closest thing possible to the ECMAScript 5
      // internal IsCallable function
      throw new TypeError('Function.prototype.bind - what is trying to be bound is not callable');
    }

    var aArgs   = Array.prototype.slice.call(arguments, 1),
        fToBind = this,
        fNOP    = function() {},
        fBound  = function() {
          return fToBind.apply(this instanceof fNOP && oThis
                 ? this
                 : oThis,
                 aArgs.concat(Array.prototype.slice.call(arguments)));
        };

    fNOP.prototype = this.prototype;
    fBound.prototype = new fNOP();

    return fBound;
  };
}

// rAF polyfill
(function() {
    var lastTime = 0;
    var vendors = ['ms', 'moz', 'webkit', 'o'];
    for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
        window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame'];
        window.cancelAnimationFrame = window[vendors[x]+'CancelAnimationFrame'] 
                                   || window[vendors[x]+'CancelRequestAnimationFrame'];
    }
 
    if (!window.requestAnimationFrame)
        window.requestAnimationFrame = function(callback, element) {
            var currTime = new Date().getTime();
            var timeToCall = Math.max(0, 16 - (currTime - lastTime));
            var id = window.setTimeout(function() { callback(currTime + timeToCall); }, 
              timeToCall);
            lastTime = currTime + timeToCall;
            return id;
        };
 
    if (!window.cancelAnimationFrame)
        window.cancelAnimationFrame = function(id) {
            clearTimeout(id);
        };
}());


function selectElementContents(el) {
  if (window.getSelection && document.createRange) {
    var sel = window.getSelection();
    var range = document.createRange();
    range.selectNodeContents(el);
    sel.removeAllRanges();
    sel.addRange(range);
  } else if (document.selection && document.body.createTextRange) {
    var textRange = document.body.createTextRange();
    textRange.moveToElementText(el);
    textRange.select();
  }
}