You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
56 lines
1.5 KiB
56 lines
1.5 KiB
/*
|
|
---
|
|
|
|
script: Array.stableSort.js
|
|
|
|
description: Add a stable sort algorithm for all browsers
|
|
|
|
license: MIT-style license.
|
|
|
|
authors:
|
|
- Yorick Sijsling
|
|
|
|
requires:
|
|
core/1.3: '*'
|
|
|
|
provides:
|
|
- [Array.stableSort, Array.mergeSort]
|
|
|
|
...
|
|
*/
|
|
|
|
(function() {
|
|
|
|
var defaultSortFunction = function(a, b) {
|
|
return a > b ? 1 : (a < b ? -1 : 0);
|
|
}
|
|
|
|
Array.implement({
|
|
|
|
stableSort: function(compare) {
|
|
// I would love some real feature recognition. Problem is that an unstable algorithm sometimes/often gives the same result as an unstable algorithm.
|
|
return (Browser.chrome || Browser.firefox2 || Browser.opera9) ? this.mergeSort(compare) : this.sort(compare);
|
|
},
|
|
|
|
mergeSort: function(compare, token) {
|
|
compare = compare || defaultSortFunction;
|
|
if (this.length > 1) {
|
|
// Split and sort both parts
|
|
var right = this.splice(Math.floor(this.length / 2)).mergeSort(compare);
|
|
var left = this.splice(0).mergeSort(compare); // 'this' is now empty.
|
|
|
|
// Merge parts together
|
|
while (left.length > 0 || right.length > 0) {
|
|
this.push(
|
|
right.length === 0 ? left.shift()
|
|
: left.length === 0 ? right.shift()
|
|
: compare(left[0], right[0]) > 0 ? right.shift()
|
|
: left.shift());
|
|
}
|
|
}
|
|
return this;
|
|
}
|
|
|
|
});
|
|
})();
|
|
|
|
|