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264 lines
10 KiB
JavaScript
264 lines
10 KiB
JavaScript
/*
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Copyright (c) 2004-2011, The Dojo Foundation All Rights Reserved.
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Available via Academic Free License >= 2.1 OR the modified BSD license.
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see: http://dojotoolkit.org/license for details
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*/
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if(!dojo._hasResource["dojo._base.array"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
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dojo._hasResource["dojo._base.array"] = true;
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dojo.provide("dojo._base.array");
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dojo.require("dojo._base.lang");
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(function(){
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var _getParts = function(arr, obj, cb){
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return [
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(typeof arr == "string") ? arr.split("") : arr,
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obj || dojo.global,
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// FIXME: cache the anonymous functions we create here?
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(typeof cb == "string") ? new Function("item", "index", "array", cb) : cb
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];
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};
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var everyOrSome = function(/*Boolean*/every, /*Array|String*/arr, /*Function|String*/callback, /*Object?*/thisObject){
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var _p = _getParts(arr, thisObject, callback); arr = _p[0];
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for(var i=0,l=arr.length; i<l; ++i){
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var result = !!_p[2].call(_p[1], arr[i], i, arr);
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if(every ^ result){
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return result; // Boolean
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}
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}
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return every; // Boolean
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};
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dojo.mixin(dojo, {
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indexOf: function( /*Array*/ array,
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/*Object*/ value,
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/*Integer?*/ fromIndex,
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/*Boolean?*/ findLast){
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// summary:
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// locates the first index of the provided value in the
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// passed array. If the value is not found, -1 is returned.
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// description:
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// This method corresponds to the JavaScript 1.6 Array.indexOf method, with one difference: when
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// run over sparse arrays, the Dojo function invokes the callback for every index whereas JavaScript
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// 1.6's indexOf skips the holes in the sparse array.
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// For details on this method, see:
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// https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Objects/Array/indexOf
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var step = 1, end = array.length || 0, i = 0;
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if(findLast){
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i = end - 1;
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step = end = -1;
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}
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if(fromIndex != undefined){ i = fromIndex; }
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if((findLast && i > end) || i < end){
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for(; i != end; i += step){
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if(array[i] == value){ return i; }
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}
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}
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return -1; // Number
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},
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lastIndexOf: function(/*Array*/array, /*Object*/value, /*Integer?*/fromIndex){
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// summary:
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// locates the last index of the provided value in the passed
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// array. If the value is not found, -1 is returned.
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// description:
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// This method corresponds to the JavaScript 1.6 Array.lastIndexOf method, with one difference: when
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// run over sparse arrays, the Dojo function invokes the callback for every index whereas JavaScript
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// 1.6's lastIndexOf skips the holes in the sparse array.
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// For details on this method, see:
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// https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Objects/Array/lastIndexOf
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return dojo.indexOf(array, value, fromIndex, true); // Number
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},
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forEach: function(/*Array|String*/arr, /*Function|String*/callback, /*Object?*/thisObject){
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// summary:
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// for every item in arr, callback is invoked. Return values are ignored.
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// If you want to break out of the loop, consider using dojo.every() or dojo.some().
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// forEach does not allow breaking out of the loop over the items in arr.
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// arr:
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// the array to iterate over. If a string, operates on individual characters.
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// callback:
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// a function is invoked with three arguments: item, index, and array
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// thisObject:
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// may be used to scope the call to callback
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// description:
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// This function corresponds to the JavaScript 1.6 Array.forEach() method, with one difference: when
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// run over sparse arrays, this implemenation passes the "holes" in the sparse array to
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// the callback function with a value of undefined. JavaScript 1.6's forEach skips the holes in the sparse array.
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// For more details, see:
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// https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Objects/Array/forEach
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// example:
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// | // log out all members of the array:
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// | dojo.forEach(
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// | [ "thinger", "blah", "howdy", 10 ],
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// | function(item){
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// | console.log(item);
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// | }
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// | );
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// example:
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// | // log out the members and their indexes
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// | dojo.forEach(
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// | [ "thinger", "blah", "howdy", 10 ],
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// | function(item, idx, arr){
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// | console.log(item, "at index:", idx);
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// | }
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// | );
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// example:
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// | // use a scoped object member as the callback
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// |
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// | var obj = {
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// | prefix: "logged via obj.callback:",
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// | callback: function(item){
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// | console.log(this.prefix, item);
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// | }
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// | };
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// |
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// | // specifying the scope function executes the callback in that scope
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// | dojo.forEach(
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// | [ "thinger", "blah", "howdy", 10 ],
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// | obj.callback,
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// | obj
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// | );
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// |
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// | // alternately, we can accomplish the same thing with dojo.hitch()
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// | dojo.forEach(
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// | [ "thinger", "blah", "howdy", 10 ],
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// | dojo.hitch(obj, "callback")
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// | );
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// match the behavior of the built-in forEach WRT empty arrs
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if(!arr || !arr.length){ return; }
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// FIXME: there are several ways of handilng thisObject. Is
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// dojo.global always the default context?
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var _p = _getParts(arr, thisObject, callback); arr = _p[0];
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for(var i=0,l=arr.length; i<l; ++i){
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_p[2].call(_p[1], arr[i], i, arr);
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}
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},
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every: function(/*Array|String*/arr, /*Function|String*/callback, /*Object?*/thisObject){
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// summary:
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// Determines whether or not every item in arr satisfies the
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// condition implemented by callback.
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// arr:
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// the array to iterate on. If a string, operates on individual characters.
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// callback:
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// a function is invoked with three arguments: item, index,
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// and array and returns true if the condition is met.
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// thisObject:
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// may be used to scope the call to callback
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// description:
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// This function corresponds to the JavaScript 1.6 Array.every() method, with one difference: when
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// run over sparse arrays, this implemenation passes the "holes" in the sparse array to
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// the callback function with a value of undefined. JavaScript 1.6's every skips the holes in the sparse array.
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// For more details, see:
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// https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Objects/Array/every
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// example:
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// | // returns false
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// | dojo.every([1, 2, 3, 4], function(item){ return item>1; });
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// example:
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// | // returns true
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// | dojo.every([1, 2, 3, 4], function(item){ return item>0; });
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return everyOrSome(true, arr, callback, thisObject); // Boolean
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},
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some: function(/*Array|String*/arr, /*Function|String*/callback, /*Object?*/thisObject){
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// summary:
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// Determines whether or not any item in arr satisfies the
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// condition implemented by callback.
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// arr:
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// the array to iterate over. If a string, operates on individual characters.
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// callback:
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// a function is invoked with three arguments: item, index,
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// and array and returns true if the condition is met.
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// thisObject:
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// may be used to scope the call to callback
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// description:
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// This function corresponds to the JavaScript 1.6 Array.some() method, with one difference: when
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// run over sparse arrays, this implemenation passes the "holes" in the sparse array to
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// the callback function with a value of undefined. JavaScript 1.6's some skips the holes in the sparse array.
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// For more details, see:
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// https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Objects/Array/some
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// example:
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// | // is true
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// | dojo.some([1, 2, 3, 4], function(item){ return item>1; });
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// example:
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// | // is false
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// | dojo.some([1, 2, 3, 4], function(item){ return item<1; });
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return everyOrSome(false, arr, callback, thisObject); // Boolean
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},
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map: function(/*Array|String*/arr, /*Function|String*/callback, /*Function?*/thisObject){
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// summary:
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// applies callback to each element of arr and returns
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// an Array with the results
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// arr:
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// the array to iterate on. If a string, operates on
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// individual characters.
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// callback:
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// a function is invoked with three arguments, (item, index,
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// array), and returns a value
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// thisObject:
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// may be used to scope the call to callback
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// description:
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// This function corresponds to the JavaScript 1.6 Array.map() method, with one difference: when
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// run over sparse arrays, this implemenation passes the "holes" in the sparse array to
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// the callback function with a value of undefined. JavaScript 1.6's map skips the holes in the sparse array.
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// For more details, see:
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// https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Objects/Array/map
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// example:
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// | // returns [2, 3, 4, 5]
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// | dojo.map([1, 2, 3, 4], function(item){ return item+1 });
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var _p = _getParts(arr, thisObject, callback); arr = _p[0];
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var outArr = (arguments[3] ? (new arguments[3]()) : []);
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for(var i=0,l=arr.length; i<l; ++i){
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outArr.push(_p[2].call(_p[1], arr[i], i, arr));
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}
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return outArr; // Array
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},
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filter: function(/*Array*/arr, /*Function|String*/callback, /*Object?*/thisObject){
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// summary:
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// Returns a new Array with those items from arr that match the
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// condition implemented by callback.
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// arr:
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// the array to iterate over.
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// callback:
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// a function that is invoked with three arguments (item,
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// index, array). The return of this function is expected to
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// be a boolean which determines whether the passed-in item
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// will be included in the returned array.
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// thisObject:
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// may be used to scope the call to callback
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// description:
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// This function corresponds to the JavaScript 1.6 Array.filter() method, with one difference: when
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// run over sparse arrays, this implemenation passes the "holes" in the sparse array to
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// the callback function with a value of undefined. JavaScript 1.6's filter skips the holes in the sparse array.
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// For more details, see:
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// https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Objects/Array/filter
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// example:
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// | // returns [2, 3, 4]
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// | dojo.filter([1, 2, 3, 4], function(item){ return item>1; });
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var _p = _getParts(arr, thisObject, callback); arr = _p[0];
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var outArr = [];
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for(var i=0,l=arr.length; i<l; ++i){
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if(_p[2].call(_p[1], arr[i], i, arr)){
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outArr.push(arr[i]);
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}
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}
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return outArr; // Array
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}
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});
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})();
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/*
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*/
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}
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