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randomutil.js
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randomutil.js
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define(["util", "whrandom"], function (util, RandomStream) {
var Randomizer = util.Class({
constructor: function (seed) {
this.stream = RandomStream(seed);
},
number: function (max) {
return Math.floor(this.stream() * max);
},
pick: function (seq) {
return seq[this.number(seq.length)];
},
pickDist: function (items) {
var total = 0;
for (var a in items) {
if (! items.hasOwnProperty(a)) {
continue;
}
if (typeof items[a] != "number") {
throw "Bad property: " + a + " not a number";
}
total += items[a];
}
var num = this.number(total);
var last;
for (a in items) {
if (! items.hasOwnProperty(a)) {
continue;
}
last = a;
if (num < items[a]) {
return a;
}
num -= items[a];
}
// FIXME: not sure if this should ever h
return last;
},
string: function (len, chars) {
var s = "";
for (var i=0; i<len; i++) {
s += this.character(chars);
}
return s;
},
character: function (chars) {
chars = chars || this.defaultChars;
return chars.charAt(this.number(chars.length));
}
});
Randomizer.prototype.lower = "abcdefghijklmnopqrstuvwxyz";
Randomizer.prototype.upper = Randomizer.prototype.lower.toUpperCase();
Randomizer.prototype.numberCharacters = "0123456789";
Randomizer.prototype.whitespace = " \t\n";
Randomizer.prototype.punctuation = "~`!@#$%^&*()_-+={}[]|\\;:'\"<>,./?";
Randomizer.prototype.defaultChars =
Randomizer.prototype.lower + Randomizer.prototype.upper +
Randomizer.prototype.numberCharacters + Randomizer.prototype.whitespace +
Randomizer.prototype.punctuation;
return Randomizer;
});