WebKit/Source/JavaScriptCore/builtins/ArrayPrototype.js at 8f5c359bbaeb0eb87946cea9ccdb8c52a2c1f143 · WebKit/WebKit · GitHub

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/*

* Copyright (C) 2014-2017 Apple Inc. All rights reserved.

* Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>.

*

* Redistribution and use in source and binary forms, with or without

* modification, are permitted provided that the following conditions

* are met:

* 1. Redistributions of source code must retain the above copyright

* notice, this list of conditions and the following disclaimer.

* 2. 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.

*

* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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.

*/

function reduce(callback /*, initialValue */)

{

"use strict";

var array = @toObject(this, "Array.prototype.reduce requires that |this| not be null or undefined");

var length = @toLength(array.length);

if (!@isCallable(callback))

@throwTypeError("Array.prototype.reduce callback must be a function");

var argumentCount = @argumentCount();

if (length === 0 && argumentCount < 2)

@throwTypeError("reduce of empty array with no initial value");

var accumulator, k = 0;

if (argumentCount > 1)

accumulator = @argument(1);

else {

while (k < length && !(k in array))

k += 1;

if (k >= length)

@throwTypeError("reduce of empty array with no initial value");

accumulator = array[k++];

}

while (k < length) {

if (k in array)

accumulator = callback.@call(@undefined, accumulator, array[k], k, array);

k += 1;

}

return accumulator;

}

function reduceRight(callback /*, initialValue */)

{

"use strict";

var array = @toObject(this, "Array.prototype.reduceRight requires that |this| not be null or undefined");

var length = @toLength(array.length);

if (!@isCallable(callback))

@throwTypeError("Array.prototype.reduceRight callback must be a function");

var argumentCount = @argumentCount();

if (length === 0 && argumentCount < 2)

@throwTypeError("reduceRight of empty array with no initial value");

var accumulator, k = length - 1;

if (argumentCount > 1)

accumulator = @argument(1);

else {

while (k >= 0 && !(k in array))

k -= 1;

if (k < 0)

@throwTypeError("reduceRight of empty array with no initial value");

accumulator = array[k--];

}

while (k >= 0) {

if (k in array)

accumulator = callback.@call(@undefined, accumulator, array[k], k, array);

k -= 1;

}

return accumulator;

}

function every(callback /*, thisArg */)

{

"use strict";

var array = @toObject(this, "Array.prototype.every requires that |this| not be null or undefined");

var length = @toLength(array.length);

if (!@isCallable(callback))

@throwTypeError("Array.prototype.every callback must be a function");

var thisArg = @argument(1);

for (var i = 0; i < length; i++) {

if (!(i in array))

continue;

if (!callback.@call(thisArg, array[i], i, array))

return false;

}

return true;

}

function forEach(callback /*, thisArg */)

{

"use strict";

var array = @toObject(this, "Array.prototype.forEach requires that |this| not be null or undefined");

var length = @toLength(array.length);

if (!@isCallable(callback))

@throwTypeError("Array.prototype.forEach callback must be a function");

var thisArg = @argument(1);

for (var i = 0; i < length; i++) {

if (i in array)

callback.@call(thisArg, array[i], i, array);

}

}

function filter(callback /*, thisArg */)

{

"use strict";

var array = @toObject(this, "Array.prototype.filter requires that |this| not be null or undefined");

var length = @toLength(array.length);

if (!@isCallable(callback))

@throwTypeError("Array.prototype.filter callback must be a function");

var thisArg = @argument(1);

var result = @newArrayWithSpecies(0, array);

var nextIndex = 0;

for (var i = 0; i < length; i++) {

if (!(i in array))

continue;

var current = array[i]

if (callback.@call(thisArg, current, i, array)) {

@putByValDirect(result, nextIndex, current);

++nextIndex;

}

}

return result;

}

function map(callback /*, thisArg */)

{

"use strict";

var array = @toObject(this, "Array.prototype.map requires that |this| not be null or undefined");

var length = @toLength(array.length);

if (!@isCallable(callback))

@throwTypeError("Array.prototype.map callback must be a function");

var thisArg = @argument(1);

var result = @newArrayWithSpecies(length, array);

for (var i = 0; i < length; i++) {

if (!(i in array))

continue;

var mappedValue = callback.@call(thisArg, array[i], i, array);

@putByValDirect(result, i, mappedValue);

}

return result;

}

function some(callback /*, thisArg */)

{

"use strict";

var array = @toObject(this, "Array.prototype.some requires that |this| not be null or undefined");

var length = @toLength(array.length);

if (!@isCallable(callback))

@throwTypeError("Array.prototype.some callback must be a function");

var thisArg = @argument(1);

for (var i = 0; i < length; i++) {

if (!(i in array))

continue;

if (callback.@call(thisArg, array[i], i, array))

return true;

}

return false;

}

function fill(value /* [, start [, end]] */)

{

"use strict";

var array = @toObject(this, "Array.prototype.fill requires that |this| not be null or undefined");

var length = @toLength(array.length);

var relativeStart = @toIntegerOrInfinity(@argument(1));

var k = 0;

if (relativeStart < 0) {

k = length + relativeStart;

if (k < 0)

k = 0;

} else {

k = relativeStart;

if (k > length)

k = length;

}

var relativeEnd = length;

var end = @argument(2);

if (end !== @undefined)

relativeEnd = @toIntegerOrInfinity(end);

var final = 0;

if (relativeEnd < 0) {

final = length + relativeEnd;

if (final < 0)

final = 0;

} else {

final = relativeEnd;

if (final > length)

final = length;

}

for (; k < final; k++)

array[k] = value;

return array;

}

function find(callback /*, thisArg */)

{

"use strict";

var array = @toObject(this, "Array.prototype.find requires that |this| not be null or undefined");

var length = @toLength(array.length);

if (!@isCallable(callback))

@throwTypeError("Array.prototype.find callback must be a function");

var thisArg = @argument(1);

for (var i = 0; i < length; i++) {

var kValue = array[i];

if (callback.@call(thisArg, kValue, i, array))

return kValue;

}

return @undefined;

}

function findLast(callback /*, thisArg */)

{

"use strict";

var array = @toObject(this, "Array.prototype.findLast requires that |this| not be null or undefined");

var length = @toLength(array.length);

if (!@isCallable(callback))

@throwTypeError("Array.prototype.findLast callback must be a function");

var thisArg = @argument(1);

for (var i = length - 1; i >= 0; i--) {

var element = array[i];

if (callback.@call(thisArg, element, i, array))

return element;

}

return @undefined;

}

function findIndex(callback /*, thisArg */)

{

"use strict";

var array = @toObject(this, "Array.prototype.findIndex requires that |this| not be null or undefined");

var length = @toLength(array.length);

if (!@isCallable(callback))

@throwTypeError("Array.prototype.findIndex callback must be a function");

var thisArg = @argument(1);

for (var i = 0; i < length; i++) {

if (callback.@call(thisArg, array[i], i, array))

return i;

}

return -1;

}

function findLastIndex(callback /*, thisArg */)

{

"use strict";

var array = @toObject(this, "Array.prototype.findLastIndex requires that |this| not be null or undefined");

var length = @toLength(array.length);

if (!@isCallable(callback))

@throwTypeError("Array.prototype.findLastIndex callback must be a function");

var thisArg = @argument(1);

for (var i = length - 1; i >= 0; i--) {

if (callback.@call(thisArg, array[i], i, array))

return i;

}

return -1;

}

function includes(searchElement /*, fromIndex*/)

{

"use strict";

var array = @toObject(this, "Array.prototype.includes requires that |this| not be null or undefined");

var length = @toLength(array.length);

if (length === 0)

return false;

var fromIndex = 0;

var from = @argument(1);

if (from !== @undefined)

fromIndex = @toIntegerOrInfinity(from);

var index;

if (fromIndex >= 0)

index = fromIndex;

else

index = length + fromIndex;

if (index < 0)

index = 0;

var currentElement;

for (; index < length; ++index) {

currentElement = array[index];

// Use SameValueZero comparison, rather than just StrictEquals.

if (searchElement === currentElement || (searchElement !== searchElement && currentElement !== currentElement))

return true;

}

return false;

}

@linkTimeConstant

function sortStringComparator(a, b)

{

"use strict";

var aString = a.string;

var bString = b.string;

if (aString === bString)

return 0;

return aString > bString ? 1 : -1;

}

@linkTimeConstant

function sortCompact(receiver, receiverLength, compacted, isStringSort)

{

"use strict";

var undefinedCount = 0;

var compactedIndex = 0;

for (var i = 0; i < receiverLength; ++i) {

if (i in receiver) {

var value = receiver[i];

if (value === @undefined)

++undefinedCount;

else {

@putByValDirect(compacted, compactedIndex,

isStringSort ? {string: @toString(value), value} : value);

++compactedIndex;

}

}

}

return undefinedCount;

}

@linkTimeConstant

function sortCommit(receiver, receiverLength, sorted, undefinedCount)

{

"use strict";

// Move undefineds and holes to the end of an array. Result is [values..., undefineds..., holes...].

@assert(@isJSArray(sorted));

var sortedLength = sorted.length;

@assert(sortedLength + undefinedCount <= receiverLength);

var i = 0;

if (@isJSArray(receiver) && sortedLength >= 64 && typeof sorted[0] !== "number") { // heuristic

@appendMemcpy(receiver, sorted, 0);

i = sortedLength;

} else {

for (; i < sortedLength; ++i)

receiver[i] = sorted[i];

}

for (; i < sortedLength + undefinedCount; ++i)

receiver[i] = @undefined;

for (; i < receiverLength; ++i)

delete receiver[i];

}

@linkTimeConstant

function sortMerge(dst, src, srcIndex, srcEnd, width, comparator)

{

"use strict";

var left = srcIndex;

var leftEnd = @min(left + width, srcEnd);

var right = leftEnd;

var rightEnd = @min(right + width, srcEnd);

for (var dstIndex = left; dstIndex < rightEnd; ++dstIndex) {

if (right < rightEnd) {

if (left >= leftEnd) {

@putByValDirect(dst, dstIndex, src[right]);

++right;

continue;

}

// See https://bugs.webkit.org/show_bug.cgi?id=47825 on boolean special-casing

var comparisonResult = comparator(src[right], src[left]);

if (comparisonResult === false || comparisonResult < 0) {

@putByValDirect(dst, dstIndex, src[right]);

++right;

continue;

}

}

@putByValDirect(dst, dstIndex, src[left]);

++left;

}

}

@linkTimeConstant

function sortMergeSort(array, comparator)

{

"use strict";

var valueCount = array.length;

var buffer = @newArrayWithSize(valueCount);

var dst = buffer;

var src = array;

for (var width = 1; width < valueCount; width *= 2) {

for (var srcIndex = 0; srcIndex < valueCount; srcIndex += 2 * width)

@sortMerge(dst, src, srcIndex, valueCount, width, comparator);

var tmp = src;

src = dst;

dst = tmp;

}

return src;

}

@linkTimeConstant

function sortBucketSort(array, dst, bucket, depth)

{

"use strict";

if (bucket.length < 32 || depth > 32) {

var sorted = @sortMergeSort(bucket, @sortStringComparator);

for (var i = 0; i < sorted.length; ++i) {

@putByValDirect(array, dst, sorted[i].value);

++dst;

}

return dst;

}

var buckets = [ ];

@setPrototypeDirect.@call(buckets, null);

for (var i = 0; i < bucket.length; ++i) {

var entry = bucket[i];

var string = entry.string;

if (string.length == depth) {

@putByValDirect(array, dst, entry.value);

++dst;

continue;

}

var c = string.@charCodeAt(depth);

var cBucket = buckets[c];

if (cBucket)

@arrayPush(cBucket, entry);

else

@putByValDirect(buckets, c, [ entry ]);

}

for (var i = 0; i < buckets.length; ++i) {

if (!buckets[i])

continue;

dst = @sortBucketSort(array, dst, buckets[i], depth + 1);

}

return dst;

}

function sort(comparator)

{

"use strict";

var isStringSort = false;

if (comparator === @undefined)

isStringSort = true;

else if (!@isCallable(comparator))

@throwTypeError("Array.prototype.sort requires the comparator argument to be a function or undefined");

var receiver = @toObject(this, "Array.prototype.sort requires that |this| not be null or undefined");

var receiverLength = @toLength(receiver.length);

// For compatibility with Firefox and Chrome, do nothing observable

// to the target array if it has 0 or 1 sortable properties.

if (receiverLength < 2)

return receiver;

var compacted = [ ];

var sorted = null;

var undefinedCount = @sortCompact(receiver, receiverLength, compacted, isStringSort);

if (isStringSort) {

sorted = @newArrayWithSize(compacted.length);

@sortBucketSort(sorted, 0, compacted, 0);

} else

sorted = @sortMergeSort(compacted, comparator);

@sortCommit(receiver, receiverLength, sorted, undefinedCount);

return receiver;

}

@linkTimeConstant

function concatSlowPath()

{

"use strict";

var currentElement = @toObject(this, "Array.prototype.concat requires that |this| not be null or undefined");

var argCount = arguments.length;

var result = @newArrayWithSpecies(0, currentElement);

var resultIsArray = @isJSArray(result);

var resultIndex = 0;

var argIndex = 0;

do {

var spreadable = @isObject(currentElement) && currentElement.@@isConcatSpreadable;

if ((spreadable === @undefined && @isArray(currentElement)) || spreadable) {

var length = @toLength(currentElement.length);

if (length + resultIndex > @MAX_SAFE_INTEGER)

@throwTypeError("Length exceeded the maximum array length");

if (resultIsArray && @isJSArray(currentElement) && length + resultIndex <= @MAX_ARRAY_INDEX) {

@appendMemcpy(result, currentElement, resultIndex);

resultIndex += length;

} else {

for (var i = 0; i < length; i++) {

if (i in currentElement)

@putByValDirect(result, resultIndex, currentElement[i]);

resultIndex++;

}

}

} else {

if (resultIndex >= @MAX_SAFE_INTEGER)

@throwTypeError("Length exceeded the maximum array length");

@putByValDirect(result, resultIndex++, currentElement);

}

currentElement = arguments[argIndex];

} while (argIndex++ < argCount);

result.length = resultIndex;

return result;

}

function concat(first)

{

"use strict";

if (@argumentCount() === 1

&& @isJSArray(this)

&& @tryGetByIdWithWellKnownSymbol(this, "isConcatSpreadable") === @undefined

&& (!@isObject(first) || @tryGetByIdWithWellKnownSymbol(first, "isConcatSpreadable") === @undefined)) {

var result = @concatMemcpy(this, first);

if (result !== null)

return result;

}

return @tailCallForwardArguments(@concatSlowPath, this);

}

@linkTimeConstant

function maxWithPositives(a, b)

{

"use strict";

return (a < b) ? b : a;

}

@linkTimeConstant

function minWithMaybeNegativeZeroAndPositive(maybeNegativeZero, positive)

{

"use strict";

return (maybeNegativeZero < positive) ? maybeNegativeZero : positive;

}

function copyWithin(target, start /*, end */)

{

"use strict";

var array = @toObject(this, "Array.prototype.copyWithin requires that |this| not be null or undefined");

var length = @toLength(array.length);

var relativeTarget = @toIntegerOrInfinity(target);

var to = (relativeTarget < 0) ? @maxWithPositives(length + relativeTarget, 0) : @minWithMaybeNegativeZeroAndPositive(relativeTarget, length);

var relativeStart = @toIntegerOrInfinity(start);

var from = (relativeStart < 0) ? @maxWithPositives(length + relativeStart, 0) : @minWithMaybeNegativeZeroAndPositive(relativeStart, length);

var relativeEnd;

var end = @argument(2);

if (end === @undefined)

relativeEnd = length;

else

relativeEnd = @toIntegerOrInfinity(end);

var finalValue = (relativeEnd < 0) ? @maxWithPositives(length + relativeEnd, 0) : @minWithMaybeNegativeZeroAndPositive(relativeEnd, length);

var count = @minWithMaybeNegativeZeroAndPositive(finalValue - from, length - to);

var direction = 1;

if (from < to && to < from + count) {

direction = -1;

from = from + count - 1;

to = to + count - 1;

}

for (var i = 0; i < count; ++i, from += direction, to += direction) {

if (from in array)

array[to] = array[from];

else

delete array[to];

}

return array;

}

@linkTimeConstant

function flatIntoArray(target, source, sourceLength, targetIndex, depth)

{

"use strict";

for (var sourceIndex = 0; sourceIndex < sourceLength; ++sourceIndex) {

if (sourceIndex in source) {

var element = source[sourceIndex];

if (depth > 0 && @isArray(element))

targetIndex = @flatIntoArray(target, element, @toLength(element.length), targetIndex, depth - 1);

else {

if (targetIndex >= @MAX_SAFE_INTEGER)

@throwTypeError("flatten array exceeds 2**53 - 1");

@putByValDirect(target, targetIndex, element);

++targetIndex;

}

}

}

return targetIndex;

}

function flat()

{

"use strict";

var array = @toObject(this, "Array.prototype.flat requires that |this| not be null or undefined");

var length = @toLength(array.length);

var depthNum = 1;

var depth = @argument(0);

if (depth !== @undefined)

depthNum = @toIntegerOrInfinity(depth);

var result = @newArrayWithSpecies(0, array);

@flatIntoArray(result, array, length, 0, depthNum);

return result;

}

@linkTimeConstant

function flatIntoArrayWithCallback(target, source, sourceLength, targetIndex, callback, thisArg)

{

"use strict";

for (var sourceIndex = 0; sourceIndex < sourceLength; ++sourceIndex) {

if (sourceIndex in source) {

var element = callback.@call(thisArg, source[sourceIndex], sourceIndex, source);

if (@isArray(element))

targetIndex = @flatIntoArray(target, element, @toLength(element.length), targetIndex, 0);

else {

if (targetIndex >= @MAX_SAFE_INTEGER)

@throwTypeError("flatten array exceeds 2**53 - 1");

@putByValDirect(target, targetIndex, element);

++targetIndex;

}

}

}

return target;

}

function flatMap(callback)

{

"use strict";

var array = @toObject(this, "Array.prototype.flatMap requires that |this| not be null or undefined");

var length = @toLength(array.length);

if (!@isCallable(callback))

@throwTypeError("Array.prototype.flatMap callback must be a function");

var thisArg = @argument(1);

var result = @newArrayWithSpecies(0, array);

return @flatIntoArrayWithCallback(result, array, length, 0, callback, thisArg);

}

function at(index)

{

"use strict";

var array = @toObject(this, "Array.prototype.at requires that |this| not be null or undefined");

var length = @toLength(array.length);

var k = @toIntegerOrInfinity(index);

if (k < 0)

k += length;

return (k >= 0 && k < length) ? array[k] : @undefined;

}

function toReversed()

{

"use strict";

// Step 1.

var array = @toObject(this, "Array.prototype.toReversed requires that |this| not be null or undefined");

// Step 2.

var length = @toLength(array.length);

// Step 3.

var result = @newArrayWithSize(length);

// Step 4-5.

for (var k = 0; k < length; k++) {

var fromValue = array[length - k - 1];

@putByValDirect(result, k, fromValue);

}

return result;

}

function toSorted(comparator)

{

"use strict";

// Step 1.

if (comparator !== @undefined && !@isCallable(comparator))

@throwTypeError("Array.prototype.toSorted requires the comparator argument to be a function or undefined");

// Step 2.

var array = @toObject(this, "Array.prototype.toSorted requires that |this| not be null or undefined");

// Step 3.

var length = @toLength(array.length);

// Step 4.

var result = @newArrayWithSize(length);

// Step 8.

for (var k = 0; k < length; k++)

@putByValDirect(result, k, array[k]);

// Step 6.

@arraySort.@call(result, comparator);

return result;

}

function toSpliced(start, deleteCount /*, ...items */)

{

"use strict"

// Step 1.

var array = @toObject(this, "Array.prototype.toSpliced requires that |this| not be null or undefined");

// Step 2.

var length = @toLength(array.length);

// Step 3.

var relativeStart = @toIntegerOrInfinity(start);

var actualStart;

// Step 4-6.

if (relativeStart === -@Infinity)

actualStart = 0;

else if (relativeStart < 0)

actualStart = length + relativeStart > 0 ? length + relativeStart : 0;

else

actualStart = @min(relativeStart, length);

// Step 7.

var insertCount = 0;

var actualDeleteCount;

// Step 8-10.

if (arguments.length === 0)

actualDeleteCount = 0;

else if (arguments.length === 1)

actualDeleteCount = length - actualStart;

else {

insertCount = arguments.length - 2;

var tempDeleteCount = @toIntegerOrInfinity(deleteCount);

tempDeleteCount = tempDeleteCount > 0 ? tempDeleteCount : 0;

actualDeleteCount = @min(tempDeleteCount, length - actualStart);

}

// Step 11.

var newLen = length + insertCount - actualDeleteCount;

// Step 12.

if (newLen >= @MAX_SAFE_INTEGER)

@throwTypeError("Array length exceeds 2**53 - 1");

// Step 13.

var result = @newArrayWithSize(newLen);

// Step 14.

var k = 0;

// Step 16.

for (; k < actualStart; k++)

@putByValDirect(result, k, array[k]);

// Step 17.

for (var i = 0; i < insertCount; i++, k++)

@putByValDirect(result, k, arguments[i + 2]);

// Step 18.

for (; k < newLen; k++) {

var from = k + actualDeleteCount - insertCount;

@putByValDirect(result, k, array[from]);

}

return result;

}

function with(index, value)

{

"use strict";

// Step 1.

var array = @toObject(this, "Array.prototype.with requires that |this| not be null or undefined");

// Step 2.

var length = @toLength(array.length);

// Step 3.

var relativeIndex = @toIntegerOrInfinity(index);

// Step 4-5.

var actualIndex;

if (relativeIndex >= 0)

actualIndex = relativeIndex;

else

actualIndex = length + relativeIndex;

// Step 6.

if (actualIndex >= length || actualIndex < 0)

@throwRangeError("Array index out of Range");

// Step 7.

var result = @newArrayWithSize(length);

// Step 8-9

for (var k = 0; k < length; k++) {

if (k === actualIndex)

@putByValDirect(result, k, value);

else

@putByValDirect(result, k, array[k]);

}

return result;

}