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git.wh0rd.org - tt-rss.git/blob - lib/dojo/data/util/sorter.js.uncompressed.js
1 define("dojo/data/util/sorter", ["dojo/_base/lang"], function(lang
) {
3 // dojo/data/util/sorter
7 var sorter
= lang
.getObject("dojo.data.util.sorter", true);
9 sorter
.basicComparator = function( /*anything*/ a
,
12 // Basic comparision function that compares if an item is greater or less than another item
14 // returns 1 if a > b, -1 if a < b, 0 if equal.
15 // 'null' values (null, undefined) are treated as larger values so that they're pushed to the end of the list.
16 // And compared to each other, null is equivalent to undefined.
18 //null is a problematic compare, so if null, we set to undefined.
19 //Makes the check logic simple, compact, and consistent
20 //And (null == undefined) === true, so the check later against null
21 //works for undefined and is less bytes.
31 }else if(a
> b
|| a
== null){
34 return r
; //int {-1,0,1}
37 sorter
.createSortFunction = function( /* attributes array */sortSpec
, /*dojo.data.core.Read*/ store
){
39 // Helper function to generate the sorting function based off the list of sort attributes.
41 // The sort function creation will look for a property on the store called 'comparatorMap'. If it exists
42 // it will look in the mapping for comparisons function for the attributes. If one is found, it will
43 // use it instead of the basic comparator, which is typically used for strings, ints, booleans, and dates.
44 // Returns the sorting function for this particular list of attributes and sorting directions.
47 // A JS object that array that defines out what attribute names to sort on and whether it should be descenting or asending.
48 // The objects should be formatted as follows:
50 // attribute: "attributeName-string" || attribute,
51 // descending: true|false; // Default is false.
54 // The datastore object to look up item values from.
58 function createSortFunction(attr
, dir
, comp
, s
){
59 //Passing in comp and s (comparator and store), makes this
60 //function much faster.
61 return function(itemA
, itemB
){
62 var a
= s
.getValue(itemA
, attr
);
63 var b
= s
.getValue(itemB
, attr
);
64 return dir
* comp(a
,b
); //int
68 var map
= store
.comparatorMap
;
69 var bc
= sorter
.basicComparator
;
70 for(var i
= 0; i
< sortSpec
.length
; i
++){
71 sortAttribute
= sortSpec
[i
];
72 var attr
= sortAttribute
.attribute
;
74 var dir
= (sortAttribute
.descending
) ? -1 : 1;
77 if(typeof attr
!== "string" && ("toString" in attr
)){
78 attr
= attr
.toString();
80 comp
= map
[attr
] || bc
;
82 sortFunctions
.push(createSortFunction(attr
,
86 return function(rowA
, rowB
){
88 while(i
< sortFunctions
.length
){
89 var ret
= sortFunctions
[i
++](rowA
, rowB
);