// Copyright 2006-2008 the V8 project authors. All rights reserved. // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are // met: // // * Redistributions of source code must retain the above copyright // notice, this list of conditions and the following disclaimer. // * Redistributions in binary form must reproduce the above // copyright notice, this list of conditions and the following // disclaimer in the documentation and/or other materials provided // with the distribution. // * Neither the name of Google Inc. nor the names of its // contributors may be used to endorse or promote products derived // from this software without specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. // This file relies on the fact that the following declarations have been made // in runtime.js: // const $Array = global.Array; // ------------------------------------------------------------------- // Global list of arrays visited during toString, toLocaleString and // join invocations. var visited_arrays = new $Array(); // Gets a sorted array of array keys. Useful for operations on sparse // arrays. Dupes have not been removed. function GetSortedArrayKeys(array, intervals) { var length = intervals.length; var keys = []; for (var k = 0; k < length; k++) { var key = intervals[k]; if (key < 0) { var j = -1 - key; var limit = j + intervals[++k]; for (; j < limit; j++) { var e = array[j]; if (!IS_UNDEFINED(e) || j in array) { keys.push(j); } } } else { // The case where key is undefined also ends here. if (!IS_UNDEFINED(key)) { var e = array[key]; if (!IS_UNDEFINED(e) || key in array) { keys.push(key); } } } } keys.sort(function(a, b) { return a - b; }); return keys; } // Optimized for sparse arrays if separator is ''. function SparseJoin(array, len, convert) { var keys = GetSortedArrayKeys(array, %GetArrayKeys(array, len)); var last_key = -1; var keys_length = keys.length; var elements = new $Array(keys_length); var elements_length = 0; for (var i = 0; i < keys_length; i++) { var key = keys[i]; if (key != last_key) { var e = array[key]; if (!IS_STRING(e)) e = convert(e); elements[elements_length++] = e; last_key = key; } } return %StringBuilderConcat(elements, elements_length, ''); } function UseSparseVariant(object, length, is_array) { return is_array && length > 1000 && (!%_IsSmi(length) || %EstimateNumberOfElements(object) < (length >> 2)); } function Join(array, length, separator, convert) { if (length == 0) return ''; var is_array = IS_ARRAY(array); if (is_array) { // If the array is cyclic, return the empty string for already // visited arrays. if (!%PushIfAbsent(visited_arrays, array)) return ''; } // Attempt to convert the elements. try { if (UseSparseVariant(array, length, is_array) && (separator.length == 0)) { return SparseJoin(array, length, convert); } // Fast case for one-element arrays. if (length == 1) { var e = array[0]; if (!IS_UNDEFINED(e) || (0 in array)) { if (IS_STRING(e)) return e; return convert(e); } } // Construct an array for the elements. var elements; var elements_length = 0; // We pull the empty separator check outside the loop for speed! if (separator.length == 0) { elements = new $Array(length); for (var i = 0; i < length; i++) { var e = array[i]; if (!IS_UNDEFINED(e) || (i in array)) { if (!IS_STRING(e)) e = convert(e); elements[elements_length++] = e; } } } else { elements = new $Array(length << 1); for (var i = 0; i < length; i++) { var e = array[i]; if (i != 0) elements[elements_length++] = separator; if (!IS_UNDEFINED(e) || (i in array)) { if (!IS_STRING(e)) e = convert(e); elements[elements_length++] = e; } } } return %StringBuilderConcat(elements, elements_length, ''); } finally { // Make sure to pop the visited array no matter what happens. if (is_array) visited_arrays.pop(); } } function ConvertToString(e) { if (e == null) return ''; else return ToString(e); } function ConvertToLocaleString(e) { if (e == null) { return ''; } else { // e_obj's toLocaleString might be overwritten, check if it is a function. // Call ToString if toLocaleString is not a function. // See issue 877615. var e_obj = ToObject(e); if (IS_FUNCTION(e_obj.toLocaleString)) return ToString(e_obj.toLocaleString()); else return ToString(e); } } // This function implements the optimized splice implementation that can use // special array operations to handle sparse arrays in a sensible fashion. function SmartSlice(array, start_i, del_count, len, deleted_elements) { // Move deleted elements to a new array (the return value from splice). // Intervals array can contain keys and intervals. See comment in Concat. var intervals = %GetArrayKeys(array, start_i + del_count); var length = intervals.length; for (var k = 0; k < length; k++) { var key = intervals[k]; if (key < 0) { var j = -1 - key; var interval_limit = j + intervals[++k]; if (j < start_i) { j = start_i; } for (; j < interval_limit; j++) { // ECMA-262 15.4.4.12 line 10. The spec could also be // interpreted such that %HasLocalProperty would be the // appropriate test. We follow KJS in consulting the // prototype. var current = array[j]; if (!IS_UNDEFINED(current) || j in array) { deleted_elements[j - start_i] = current; } } } else { if (!IS_UNDEFINED(key)) { if (key >= start_i) { // ECMA-262 15.4.4.12 line 10. The spec could also be // interpreted such that %HasLocalProperty would be the // appropriate test. We follow KJS in consulting the // prototype. var current = array[key]; if (!IS_UNDEFINED(current) || key in array) { deleted_elements[key - start_i] = current; } } } } } } // This function implements the optimized splice implementation that can use // special array operations to handle sparse arrays in a sensible fashion. function SmartMove(array, start_i, del_count, len, num_additional_args) { // Move data to new array. var new_array = new $Array(len - del_count + num_additional_args); var intervals = %GetArrayKeys(array, len); var length = intervals.length; for (var k = 0; k < length; k++) { var key = intervals[k]; if (key < 0) { var j = -1 - key; var interval_limit = j + intervals[++k]; while (j < start_i && j < interval_limit) { // The spec could also be interpreted such that // %HasLocalProperty would be the appropriate test. We follow // KJS in consulting the prototype. var current = array[j]; if (!IS_UNDEFINED(current) || j in array) { new_array[j] = current; } j++; } j = start_i + del_count; while (j < interval_limit) { // ECMA-262 15.4.4.12 lines 24 and 41. The spec could also be // interpreted such that %HasLocalProperty would be the // appropriate test. We follow KJS in consulting the // prototype. var current = array[j]; if (!IS_UNDEFINED(current) || j in array) { new_array[j - del_count + num_additional_args] = current; } j++; } } else { if (!IS_UNDEFINED(key)) { if (key < start_i) { // The spec could also be interpreted such that // %HasLocalProperty would be the appropriate test. We follow // KJS in consulting the prototype. var current = array[key]; if (!IS_UNDEFINED(current) || key in array) { new_array[key] = current; } } else if (key >= start_i + del_count) { // ECMA-262 15.4.4.12 lines 24 and 41. The spec could also // be interpreted such that %HasLocalProperty would be the // appropriate test. We follow KJS in consulting the // prototype. var current = array[key]; if (!IS_UNDEFINED(current) || key in array) { new_array[key - del_count + num_additional_args] = current; } } } } } // Move contents of new_array into this array %MoveArrayContents(new_array, array); } // This is part of the old simple-minded splice. We are using it either // because the receiver is not an array (so we have no choice) or because we // know we are not deleting or moving a lot of elements. function SimpleSlice(array, start_i, del_count, len, deleted_elements) { for (var i = 0; i < del_count; i++) { var index = start_i + i; // The spec could also be interpreted such that %HasLocalProperty // would be the appropriate test. We follow KJS in consulting the // prototype. var current = array[index]; if (!IS_UNDEFINED(current) || index in array) deleted_elements[i] = current; } } function SimpleMove(array, start_i, del_count, len, num_additional_args) { if (num_additional_args !== del_count) { // Move the existing elements after the elements to be deleted // to the right position in the resulting array. if (num_additional_args > del_count) { for (var i = len - del_count; i > start_i; i--) { var from_index = i + del_count - 1; var to_index = i + num_additional_args - 1; // The spec could also be interpreted such that // %HasLocalProperty would be the appropriate test. We follow // KJS in consulting the prototype. var current = array[from_index]; if (!IS_UNDEFINED(current) || from_index in array) { array[to_index] = current; } else { delete array[to_index]; } } } else { for (var i = start_i; i < len - del_count; i++) { var from_index = i + del_count; var to_index = i + num_additional_args; // The spec could also be interpreted such that // %HasLocalProperty would be the appropriate test. We follow // KJS in consulting the prototype. var current = array[from_index]; if (!IS_UNDEFINED(current) || from_index in array) { array[to_index] = current; } else { delete array[to_index]; } } for (var i = len; i > len - del_count + num_additional_args; i--) { delete array[i - 1]; } } } } // ------------------------------------------------------------------- function ArrayToString() { if (!IS_ARRAY(this)) { throw new $TypeError('Array.prototype.toString is not generic'); } return Join(this, this.length, ',', ConvertToString); } function ArrayToLocaleString() { if (!IS_ARRAY(this)) { throw new $TypeError('Array.prototype.toString is not generic'); } return Join(this, this.length, ',', ConvertToLocaleString); } function ArrayJoin(separator) { if (IS_UNDEFINED(separator)) { separator = ','; } else if (!IS_STRING(separator)) { separator = ToString(separator); } var length = TO_UINT32(this.length); return Join(this, length, separator, ConvertToString); } // Removes the last element from the array and returns it. See // ECMA-262, section 15.4.4.6. function ArrayPop() { var n = TO_UINT32(this.length); if (n == 0) { this.length = n; return; } n--; var value = this[n]; this.length = n; delete this[n]; return value; } // Appends the arguments to the end of the array and returns the new // length of the array. See ECMA-262, section 15.4.4.7. function ArrayPush() { var n = TO_UINT32(this.length); var m = %_ArgumentsLength(); for (var i = 0; i < m; i++) { this[i+n] = %_Arguments(i); } this.length = n + m; return this.length; } function ArrayConcat(arg1) { // length == 1 // TODO: can we just use arguments? var arg_count = %_ArgumentsLength(); var arrays = new $Array(1 + arg_count); arrays[0] = this; for (var i = 0; i < arg_count; i++) { arrays[i + 1] = %_Arguments(i); } return %ArrayConcat(arrays); } // For implementing reverse() on large, sparse arrays. function SparseReverse(array, len) { var keys = GetSortedArrayKeys(array, %GetArrayKeys(array, len)); var high_counter = keys.length - 1; var low_counter = 0; while (low_counter <= high_counter) { var i = keys[low_counter]; var j = keys[high_counter]; var j_complement = len - j - 1; var low, high; if (j_complement <= i) { high = j; while (keys[--high_counter] == j); low = j_complement; } if (j_complement >= i) { low = i; while (keys[++low_counter] == i); high = len - i - 1; } var current_i = array[low]; if (!IS_UNDEFINED(current_i) || low in array) { var current_j = array[high]; if (!IS_UNDEFINED(current_j) || high in array) { array[low] = current_j; array[high] = current_i; } else { array[high] = current_i; delete array[low]; } } else { var current_j = array[high]; if (!IS_UNDEFINED(current_j) || high in array) { array[low] = current_j; delete array[high]; } } } } function ArrayReverse() { var j = TO_UINT32(this.length) - 1; if (UseSparseVariant(this, j, IS_ARRAY(this))) { SparseReverse(this, j+1); return this; } for (var i = 0; i < j; i++, j--) { var current_i = this[i]; if (!IS_UNDEFINED(current_i) || i in this) { var current_j = this[j]; if (!IS_UNDEFINED(current_j) || j in this) { this[i] = current_j; this[j] = current_i; } else { this[j] = current_i; delete this[i]; } } else { var current_j = this[j]; if (!IS_UNDEFINED(current_j) || j in this) { this[i] = current_j; delete this[j]; } } } return this; } function ArrayShift() { var len = TO_UINT32(this.length); if (len === 0) { this.length = 0; return; } var first = this[0]; if (IS_ARRAY(this)) SmartMove(this, 0, 1, len, 0); else SimpleMove(this, 0, 1, len, 0); this.length = len - 1; return first; } function ArrayUnshift(arg1) { // length == 1 var len = TO_UINT32(this.length); var num_arguments = %_ArgumentsLength(); if (IS_ARRAY(this)) SmartMove(this, 0, 0, len, num_arguments); else SimpleMove(this, 0, 0, len, num_arguments); for (var i = 0; i < num_arguments; i++) { this[i] = %_Arguments(i); } this.length = len + num_arguments; return len + num_arguments; } function ArraySlice(start, end) { var len = TO_UINT32(this.length); var start_i = TO_INTEGER(start); var end_i = len; if (end !== void 0) end_i = TO_INTEGER(end); if (start_i < 0) { start_i += len; if (start_i < 0) start_i = 0; } else { if (start_i > len) start_i = len; } if (end_i < 0) { end_i += len; if (end_i < 0) end_i = 0; } else { if (end_i > len) end_i = len; } var result = []; if (end_i < start_i) return result; if (IS_ARRAY(this)) { SmartSlice(this, start_i, end_i - start_i, len, result); } else { SimpleSlice(this, start_i, end_i - start_i, len, result); } result.length = end_i - start_i; return result; } function ArraySplice(start, delete_count) { var num_arguments = %_ArgumentsLength(); // SpiderMonkey and JSC return undefined in the case where no // arguments are given instead of using the implicit undefined // arguments. This does not follow ECMA-262, but we do the same for // compatibility. // TraceMonkey follows ECMA-262 though. if (num_arguments == 0) return; var len = TO_UINT32(this.length); var start_i = TO_INTEGER(start); if (start_i < 0) { start_i += len; if (start_i < 0) start_i = 0; } else { if (start_i > len) start_i = len; } // SpiderMonkey, TraceMonkey and JSC treat the case where no delete count is // given differently from when an undefined delete count is given. // This does not follow ECMA-262, but we do the same for // compatibility. var del_count = 0; if (num_arguments > 1) { del_count = TO_INTEGER(delete_count); if (del_count < 0) del_count = 0; if (del_count > len - start_i) del_count = len - start_i; } else { del_count = len - start_i; } var deleted_elements = []; deleted_elements.length = del_count; // Number of elements to add. var num_additional_args = 0; if (num_arguments > 2) { num_additional_args = num_arguments - 2; } var use_simple_splice = true; if (IS_ARRAY(this) && num_additional_args !== del_count) { // If we are only deleting/moving a few things near the end of the // array then the simple version is going to be faster, because it // doesn't touch most of the array. var estimated_non_hole_elements = %EstimateNumberOfElements(this); if (len > 20 && (estimated_non_hole_elements >> 2) < (len - start_i)) { use_simple_splice = false; } } if (use_simple_splice) { SimpleSlice(this, start_i, del_count, len, deleted_elements); SimpleMove(this, start_i, del_count, len, num_additional_args); } else { SmartSlice(this, start_i, del_count, len, deleted_elements); SmartMove(this, start_i, del_count, len, num_additional_args); } // Insert the arguments into the resulting array in // place of the deleted elements. var i = start_i; var arguments_index = 2; var arguments_length = %_ArgumentsLength(); while (arguments_index < arguments_length) { this[i++] = %_Arguments(arguments_index++); } this.length = len - del_count + num_additional_args; // Return the deleted elements. return deleted_elements; } function ArraySort(comparefn) { // In-place QuickSort algorithm. // For short (length <= 22) arrays, insertion sort is used for efficiency. if (!IS_FUNCTION(comparefn)) { comparefn = function (x, y) { if (x === y) return 0; if (%_IsSmi(x) && %_IsSmi(y)) { return %SmiLexicographicCompare(x, y); } x = ToString(x); y = ToString(y); if (x == y) return 0; else return x < y ? -1 : 1; }; } var global_receiver = %GetGlobalReceiver(); function InsertionSort(a, from, to) { for (var i = from + 1; i < to; i++) { var element = a[i]; for (var j = i - 1; j >= from; j--) { var tmp = a[j]; var order = %_CallFunction(global_receiver, tmp, element, comparefn); if (order > 0) { a[j + 1] = tmp; } else { break; } } a[j + 1] = element; } } function QuickSort(a, from, to) { // Insertion sort is faster for short arrays. if (to - from <= 22) { InsertionSort(a, from, to); return; } var pivot_index = $floor($random() * (to - from)) + from; var pivot = a[pivot_index]; // Issue 95: Keep the pivot element out of the comparisons to avoid // infinite recursion if comparefn(pivot, pivot) != 0. %_SwapElements(a, from, pivot_index); var low_end = from; // Upper bound of the elements lower than pivot. var high_start = to; // Lower bound of the elements greater than pivot. // From low_end to i are elements equal to pivot. // From i to high_start are elements that haven't been compared yet. for (var i = from + 1; i < high_start; ) { var element = a[i]; var order = %_CallFunction(global_receiver, element, pivot, comparefn); if (order < 0) { %_SwapElements(a, i, low_end); i++; low_end++; } else if (order > 0) { high_start--; %_SwapElements(a, i, high_start); } else { // order == 0 i++; } } QuickSort(a, from, low_end); QuickSort(a, high_start, to); } // Copies elements in the range 0..length from obj's prototype chain // to obj itself, if obj has holes. Returns one more than the maximal index // of a prototype property. function CopyFromPrototype(obj, length) { var max = 0; for (var proto = obj.__proto__; proto; proto = proto.__proto__) { var indices = %GetArrayKeys(proto, length); if (indices.length > 0) { if (indices[0] == -1) { // It's an interval. var proto_length = indices[1]; for (var i = 0; i < proto_length; i++) { if (!obj.hasOwnProperty(i) && proto.hasOwnProperty(i)) { obj[i] = proto[i]; if (i >= max) { max = i + 1; } } } } else { for (var i = 0; i < indices.length; i++) { var index = indices[i]; if (!IS_UNDEFINED(index) && !obj.hasOwnProperty(index) && proto.hasOwnProperty(index)) { obj[index] = proto[index]; if (index >= max) { max = index + 1; } } } } } } return max; } // Set a value of "undefined" on all indices in the range from..to // where a prototype of obj has an element. I.e., shadow all prototype // elements in that range. function ShadowPrototypeElements(obj, from, to) { for (var proto = obj.__proto__; proto; proto = proto.__proto__) { var indices = %GetArrayKeys(proto, to); if (indices.length > 0) { if (indices[0] == -1) { // It's an interval. var proto_length = indices[1]; for (var i = from; i < proto_length; i++) { if (proto.hasOwnProperty(i)) { obj[i] = void 0; } } } else { for (var i = 0; i < indices.length; i++) { var index = indices[i]; if (!IS_UNDEFINED(index) && from <= index && proto.hasOwnProperty(index)) { obj[index] = void 0; } } } } } } function SafeRemoveArrayHoles(obj) { // Copy defined elements from the end to fill in all holes and undefineds // in the beginning of the array. Write undefineds and holes at the end // after loop is finished. var first_undefined = 0; var last_defined = length - 1; var num_holes = 0; while (first_undefined < last_defined) { // Find first undefined element. while (first_undefined < last_defined && !IS_UNDEFINED(obj[first_undefined])) { first_undefined++; } // Maintain the invariant num_holes = the number of holes in the original // array with indices <= first_undefined or > last_defined. if (!obj.hasOwnProperty(first_undefined)) { num_holes++; } // Find last defined element. while (first_undefined < last_defined && IS_UNDEFINED(obj[last_defined])) { if (!obj.hasOwnProperty(last_defined)) { num_holes++; } last_defined--; } if (first_undefined < last_defined) { // Fill in hole or undefined. obj[first_undefined] = obj[last_defined]; obj[last_defined] = void 0; } } // If there were any undefineds in the entire array, first_undefined // points to one past the last defined element. Make this true if // there were no undefineds, as well, so that first_undefined == number // of defined elements. if (!IS_UNDEFINED(obj[first_undefined])) first_undefined++; // Fill in the undefineds and the holes. There may be a hole where // an undefined should be and vice versa. var i; for (i = first_undefined; i < length - num_holes; i++) { obj[i] = void 0; } for (i = length - num_holes; i < length; i++) { // For compatability with Webkit, do not expose elements in the prototype. if (i in obj.__proto__) { obj[i] = void 0; } else { delete obj[i]; } } // Return the number of defined elements. return first_undefined; } var length = TO_UINT32(this.length); if (length < 2) return this; var is_array = IS_ARRAY(this); var max_prototype_element; if (!is_array) { // For compatibility with JSC, we also sort elements inherited from // the prototype chain on non-Array objects. // We do this by copying them to this object and sorting only // local elements. This is not very efficient, but sorting with // inherited elements happens very, very rarely, if at all. // The specification allows "implementation dependent" behavior // if an element on the prototype chain has an element that // might interact with sorting. max_prototype_element = CopyFromPrototype(this, length); } var num_non_undefined = %RemoveArrayHoles(this, length); if (num_non_undefined == -1) { // There were indexed accessors in the array. Move array holes and // undefineds to the end using a Javascript function that is safe // in the presence of accessors. num_non_undefined = SafeRemoveArrayHoles(this); } QuickSort(this, 0, num_non_undefined); if (!is_array && (num_non_undefined + 1 < max_prototype_element)) { // For compatibility with JSC, we shadow any elements in the prototype // chain that has become exposed by sort moving a hole to its position. ShadowPrototypeElements(this, num_non_undefined, max_prototype_element); } return this; } // The following functions cannot be made efficient on sparse arrays while // preserving the semantics, since the calls to the receiver function can add // or delete elements from the array. function ArrayFilter(f, receiver) { if (!IS_FUNCTION(f)) { throw MakeTypeError('called_non_callable', [ f ]); } // Pull out the length so that modifications to the length in the // loop will not affect the looping. var length = this.length; var result = []; var result_length = 0; for (var i = 0; i < length; i++) { var current = this[i]; if (!IS_UNDEFINED(current) || i in this) { if (f.call(receiver, current, i, this)) result[result_length++] = current; } } return result; } function ArrayForEach(f, receiver) { if (!IS_FUNCTION(f)) { throw MakeTypeError('called_non_callable', [ f ]); } // Pull out the length so that modifications to the length in the // loop will not affect the looping. var length = TO_UINT32(this.length); for (var i = 0; i < length; i++) { var current = this[i]; if (!IS_UNDEFINED(current) || i in this) { f.call(receiver, current, i, this); } } } // Executes the function once for each element present in the // array until it finds one where callback returns true. function ArraySome(f, receiver) { if (!IS_FUNCTION(f)) { throw MakeTypeError('called_non_callable', [ f ]); } // Pull out the length so that modifications to the length in the // loop will not affect the looping. var length = TO_UINT32(this.length); for (var i = 0; i < length; i++) { var current = this[i]; if (!IS_UNDEFINED(current) || i in this) { if (f.call(receiver, current, i, this)) return true; } } return false; } function ArrayEvery(f, receiver) { if (!IS_FUNCTION(f)) { throw MakeTypeError('called_non_callable', [ f ]); } // Pull out the length so that modifications to the length in the // loop will not affect the looping. var length = TO_UINT32(this.length); for (var i = 0; i < length; i++) { var current = this[i]; if (!IS_UNDEFINED(current) || i in this) { if (!f.call(receiver, current, i, this)) return false; } } return true; } function ArrayMap(f, receiver) { if (!IS_FUNCTION(f)) { throw MakeTypeError('called_non_callable', [ f ]); } // Pull out the length so that modifications to the length in the // loop will not affect the looping. var length = TO_UINT32(this.length); var result = new $Array(length); for (var i = 0; i < length; i++) { var current = this[i]; if (!IS_UNDEFINED(current) || i in this) { result[i] = f.call(receiver, current, i, this); } } return result; } function ArrayIndexOf(element, index) { var length = this.length; if (index == null) { index = 0; } else { index = TO_INTEGER(index); // If index is negative, index from the end of the array. if (index < 0) index = length + index; // If index is still negative, search the entire array. if (index < 0) index = 0; } if (!IS_UNDEFINED(element)) { for (var i = index; i < length; i++) { if (this[i] === element) return i; } return -1; } // Lookup through the array. for (var i = index; i < length; i++) { if (IS_UNDEFINED(this[i]) && i in this) { return i; } } return -1; } function ArrayLastIndexOf(element, index) { var length = this.length; if (index == null) { index = length - 1; } else { index = TO_INTEGER(index); // If index is negative, index from end of the array. if (index < 0) index = length + index; // If index is still negative, do not search the array. if (index < 0) index = -1; else if (index >= length) index = length - 1; } // Lookup through the array. if (!IS_UNDEFINED(element)) { for (var i = index; i >= 0; i--) { if (this[i] === element) return i; } return -1; } for (var i = index; i >= 0; i--) { if (IS_UNDEFINED(this[i]) && i in this) { return i; } } return -1; } function ArrayReduce(callback, current) { if (!IS_FUNCTION(callback)) { throw MakeTypeError('called_non_callable', [callback]); } // Pull out the length so that modifications to the length in the // loop will not affect the looping. var length = this.length; var i = 0; find_initial: if (%_ArgumentsLength() < 2) { for (; i < length; i++) { current = this[i]; if (!IS_UNDEFINED(current) || i in this) { i++; break find_initial; } } throw MakeTypeError('reduce_no_initial', []); } for (; i < length; i++) { var element = this[i]; if (!IS_UNDEFINED(element) || i in this) { current = callback.call(null, current, element, i, this); } } return current; } function ArrayReduceRight(callback, current) { if (!IS_FUNCTION(callback)) { throw MakeTypeError('called_non_callable', [callback]); } var i = this.length - 1; find_initial: if (%_ArgumentsLength() < 2) { for (; i >= 0; i--) { current = this[i]; if (!IS_UNDEFINED(current) || i in this) { i--; break find_initial; } } throw MakeTypeError('reduce_no_initial', []); } for (; i >= 0; i--) { var element = this[i]; if (!IS_UNDEFINED(element) || i in this) { current = callback.call(null, current, element, i, this); } } return current; } // ES5, 15.4.3.2 function ArrayIsArray(obj) { return IS_ARRAY(obj); } // ------------------------------------------------------------------- function SetupArray() { // Setup non-enumerable constructor property on the Array.prototype // object. %SetProperty($Array.prototype, "constructor", $Array, DONT_ENUM); // Setup non-enumerable functions on the Array object. InstallFunctions($Array, DONT_ENUM, $Array( "isArray", ArrayIsArray )); var specialFunctions = %SpecialArrayFunctions({}); function getFunction(name, jsBuiltin, len) { var f = jsBuiltin; if (specialFunctions.hasOwnProperty(name)) { f = specialFunctions[name]; } if (!IS_UNDEFINED(len)) { %FunctionSetLength(f, len); } return f; } // Setup non-enumerable functions of the Array.prototype object and // set their names. // Manipulate the length of some of the functions to meet // expectations set by ECMA-262 or Mozilla. InstallFunctionsOnHiddenPrototype($Array.prototype, DONT_ENUM, $Array( "toString", getFunction("toString", ArrayToString), "toLocaleString", getFunction("toLocaleString", ArrayToLocaleString), "join", getFunction("join", ArrayJoin), "pop", getFunction("pop", ArrayPop), "push", getFunction("push", ArrayPush, 1), "concat", getFunction("concat", ArrayConcat, 1), "reverse", getFunction("reverse", ArrayReverse), "shift", getFunction("shift", ArrayShift), "unshift", getFunction("unshift", ArrayUnshift, 1), "slice", getFunction("slice", ArraySlice, 2), "splice", getFunction("splice", ArraySplice, 2), "sort", getFunction("sort", ArraySort), "filter", getFunction("filter", ArrayFilter, 1), "forEach", getFunction("forEach", ArrayForEach, 1), "some", getFunction("some", ArraySome, 1), "every", getFunction("every", ArrayEvery, 1), "map", getFunction("map", ArrayMap, 1), "indexOf", getFunction("indexOf", ArrayIndexOf, 1), "lastIndexOf", getFunction("lastIndexOf", ArrayLastIndexOf, 1), "reduce", getFunction("reduce", ArrayReduce, 1), "reduceRight", getFunction("reduceRight", ArrayReduceRight, 1) )); %FinishArrayPrototypeSetup($Array.prototype); } SetupArray();