Revert of [DevTools] Extract platform module.

Source/devtools/front_end/common/utilities.js

+/*
+ * Copyright (C) 2007 Apple Inc.  All rights reserved.
+ * Copyright (C) 2012 Google Inc. All rights reserved.
+ *
+ * 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.
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") 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 APPLE AND ITS 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 APPLE OR ITS 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.
+ */
+
+/** @typedef {Array|NodeList|Arguments|{length: number}} */
+var ArrayLike;
+
+/**
+ * @param {!Object} obj
+ * @return {boolean}
+ */
+Object.isEmpty = function(obj)
+{
+    for (var i in obj)
+        return false;
+    return true;
+}
+
+/**
+ * @param {!Object.<string,!T>} obj
+ * @return {!Array.<!T>}
+ * @template T
+ */
+Object.values = function(obj)
+{
+    var result = Object.keys(obj);
+    var length = result.length;
+    for (var i = 0; i < length; ++i)
+        result[i] = obj[result[i]];
+    return result;
+}
+
+/**
+ * @param {number} m
+ * @param {number} n
+ * @return {number}
+ */
+function mod(m, n)
+{
+    return ((m % n) + n) % n;
+}
+
+/**
+ * @param {string} string
+ * @return {!Array.<number>}
+ */
+String.prototype.findAll = function(string)
+{
+    var matches = [];
+    var i = this.indexOf(string);
+    while (i !== -1) {
+        matches.push(i);
+        i = this.indexOf(string, i + string.length);
+    }
+    return matches;
+}
+
+/**
+ * @return {!Array.<number>}
+ */
+String.prototype.lineEndings = function()
+{
+    if (!this._lineEndings) {
+        this._lineEndings = this.findAll("\n");
+        this._lineEndings.push(this.length);
+    }
+    return this._lineEndings;
+}
+
+/**
+ * @return {number}
+ */
+String.prototype.lineCount = function()
+{
+    var lineEndings = this.lineEndings();
+    return lineEndings.length;
+}
+
+/**
+ * @return {string}
+ */
+String.prototype.lineAt = function(lineNumber)
+{
+    var lineEndings = this.lineEndings();
+    var lineStart = lineNumber > 0 ? lineEndings[lineNumber - 1] + 1 : 0;
+    var lineEnd = lineEndings[lineNumber];
+    var lineContent = this.substring(lineStart, lineEnd);
+    if (lineContent.length > 0 && lineContent.charAt(lineContent.length - 1) === "\r")
+        lineContent = lineContent.substring(0, lineContent.length - 1);
+    return lineContent;
+}
+
+/**
+ * @param {string} chars
+ * @return {string}
+ */
+String.prototype.escapeCharacters = function(chars)
+{
+    var foundChar = false;
+    for (var i = 0; i < chars.length; ++i) {
+        if (this.indexOf(chars.charAt(i)) !== -1) {
+            foundChar = true;
+            break;
+        }
+    }
+
+    if (!foundChar)
+        return String(this);
+
+    var result = "";
+    for (var i = 0; i < this.length; ++i) {
+        if (chars.indexOf(this.charAt(i)) !== -1)
+            result += "\\";
+        result += this.charAt(i);
+    }
+
+    return result;
+}
+
+/**
+ * @return {string}
+ */
+String.regexSpecialCharacters = function()
+{
+    return "^[]{}()\\.^$*+?|-,";
+}
+
+/**
+ * @return {string}
+ */
+String.prototype.escapeForRegExp = function()
+{
+    return this.escapeCharacters(String.regexSpecialCharacters());
+}
+
+/**
+ * @return {string}
+ */
+String.prototype.escapeHTML = function()
+{
+    return this.replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;").replace(/"/g, "&quot;"); //" doublequotes just for editor
+}
+
+/**
+ * @return {string}
+ */
+String.prototype.unescapeHTML = function()
+{
+    return this.replace(/&lt;/g, "<")
+        .replace(/&gt;/g, ">")
+        .replace(/&#58;/g, ":")
+        .replace(/&quot;/g, "\"")
+        .replace(/&#60;/g, "<")
+        .replace(/&#62;/g, ">")
+        .replace(/&amp;/g, "&");
+}
+
+/**
+ * @return {string}
+ */
+String.prototype.collapseWhitespace = function()
+{
+    return this.replace(/[\s\xA0]+/g, " ");
+}
+
+/**
+ * @param {number} maxLength
+ * @return {string}
+ */
+String.prototype.trimMiddle = function(maxLength)
+{
+    if (this.length <= maxLength)
+        return String(this);
+    var leftHalf = maxLength >> 1;
+    var rightHalf = maxLength - leftHalf - 1;
+    return this.substr(0, leftHalf) + "\u2026" + this.substr(this.length - rightHalf, rightHalf);
+}
+
+/**
+ * @param {number} maxLength
+ * @return {string}
+ */
+String.prototype.trimEnd = function(maxLength)
+{
+    if (this.length <= maxLength)
+        return String(this);
+    return this.substr(0, maxLength - 1) + "\u2026";
+}
+
+/**
+ * @param {?string=} baseURLDomain
+ * @return {string}
+ */
+String.prototype.trimURL = function(baseURLDomain)
+{
+    var result = this.replace(/^(https|http|file):\/\//i, "");
+    if (baseURLDomain)
+        result = result.replace(new RegExp("^" + baseURLDomain.escapeForRegExp(), "i"), "");
+    return result;
+}
+
+/**
+ * @return {string}
+ */
+String.prototype.toTitleCase = function()
+{
+    return this.substring(0, 1).toUpperCase() + this.substring(1);
+}
+
+/**
+ * @param {string} other
+ * @return {number}
+ */
+String.prototype.compareTo = function(other)
+{
+    if (this > other)
+        return 1;
+    if (this < other)
+        return -1;
+    return 0;
+}
+
+/**
+ * @param {string} href
+ * @return {?string}
+ */
+function sanitizeHref(href)
+{
+    return href && href.trim().toLowerCase().startsWith("javascript:") ? null : href;
+}
+
+/**
+ * @return {string}
+ */
+String.prototype.removeURLFragment = function()
+{
+    var fragmentIndex = this.indexOf("#");
+    if (fragmentIndex == -1)
+        fragmentIndex = this.length;
+    return this.substring(0, fragmentIndex);
+}
+
+/**
+ * @return {boolean}
+ */
+String.prototype.startsWith = function(substring)
+{
+    return !this.lastIndexOf(substring, 0);
+}
+
+/**
+ * @return {boolean}
+ */
+String.prototype.endsWith = function(substring)
+{
+    return this.indexOf(substring, this.length - substring.length) !== -1;
+}
+
+/**
+ * @return {number}
+ */
+String.prototype.hashCode = function()
+{
+    var result = 0;
+    for (var i = 0; i < this.length; ++i)
+        result = (result * 3 + this.charCodeAt(i)) | 0;
+    return result;
+}
+
+/**
+ * @param {number} index
+ * @return {boolean}
+ */
+String.prototype.isDigitAt = function(index)
+{
+    var c = this.charCodeAt(index);
+    return 48 <= c && c <= 57;
+}
+
+/**
+ * @param {string} a
+ * @param {string} b
+ * @return {number}
+ */
+String.naturalOrderComparator = function(a, b)
+{
+    var chunk = /^\d+|^\D+/;
+    var chunka, chunkb, anum, bnum;
+    while (1) {
+        if (a) {
+            if (!b)
+                return 1;
+        } else {
+            if (b)
+                return -1;
+            else
+                return 0;
+        }
+        chunka = a.match(chunk)[0];
+        chunkb = b.match(chunk)[0];
+        anum = !isNaN(chunka);
+        bnum = !isNaN(chunkb);
+        if (anum && !bnum)
+            return -1;
+        if (bnum && !anum)
+            return 1;
+        if (anum && bnum) {
+            var diff = chunka - chunkb;
+            if (diff)
+                return diff;
+            if (chunka.length !== chunkb.length) {
+                if (!+chunka && !+chunkb) // chunks are strings of all 0s (special case)
+                    return chunka.length - chunkb.length;
+                else
+                    return chunkb.length - chunka.length;
+            }
+        } else if (chunka !== chunkb)
+            return (chunka < chunkb) ? -1 : 1;
+        a = a.substring(chunka.length);
+        b = b.substring(chunkb.length);
+    }
+}
+
+/**
+ * @param {number} num
+ * @param {number} min
+ * @param {number} max
+ * @return {number}
+ */
+Number.constrain = function(num, min, max)
+{
+    if (num < min)
+        num = min;
+    else if (num > max)
+        num = max;
+    return num;
+}
+
+/**
+ * @param {number} a
+ * @param {number} b
+ * @return {number}
+ */
+Number.gcd = function(a, b)
+{
+    if (b === 0)
+        return a;
+    else
+        return Number.gcd(b, a % b);
+}
+
+/**
+ * @param {string} value
+ * @return {string}
+ */
+Number.toFixedIfFloating = function(value)
+{
+    if (!value || isNaN(value))
+        return value;
+    var number = Number(value);
+    return number % 1 ? number.toFixed(3) : String(number);
+}
+
+/**
+ * @return {string}
+ */
+Date.prototype.toISO8601Compact = function()
+{
+    /**
+     * @param {number} x
+     * @return {string}
+     */
+    function leadZero(x)
+    {
+        return (x > 9 ? "" : "0") + x;
+    }
+    return this.getFullYear() +
+           leadZero(this.getMonth() + 1) +
+           leadZero(this.getDate()) + "T" +
+           leadZero(this.getHours()) +
+           leadZero(this.getMinutes()) +
+           leadZero(this.getSeconds());
+}
+
+/**
+ * @return {string}
+ */
+Date.prototype.toConsoleTime = function()
+{
+    /**
+     * @param {number} x
+     * @return {string}
+     */
+    function leadZero2(x)
+    {
+        return (x > 9 ? "" : "0") + x;
+    }
+
+    /**
+     * @param {number} x
+     * @return {string}
+     */
+    function leadZero3(x)
+    {
+        return (Array(4 - x.toString().length)).join('0') + x;
+    }
+
+    return this.getFullYear() + "-" +
+           leadZero2(this.getMonth() + 1) + "-" +
+           leadZero2(this.getDate()) + " " +
+           leadZero2(this.getHours()) + ":" +
+           leadZero2(this.getMinutes()) + ":" +
+           leadZero2(this.getSeconds()) + "." +
+           leadZero3(this.getMilliseconds());
+}
+
+Object.defineProperty(Array.prototype, "remove",
+{
+    /**
+     * @param {!T} value
+     * @param {boolean=} firstOnly
+     * @this {Array.<!T>}
+     * @template T
+     */
+    value: function(value, firstOnly)
+    {
+        var index = this.indexOf(value);
+        if (index === -1)
+            return;
+        if (firstOnly) {
+            this.splice(index, 1);
+            return;
+        }
+        for (var i = index + 1, n = this.length; i < n; ++i) {
+            if (this[i] !== value)
+                this[index++] = this[i];
+        }
+        this.length = index;
+    }
+});
+
+Object.defineProperty(Array.prototype, "keySet",
+{
+    /**
+     * @return {!Object.<string, boolean>}
+     * @this {Array.<*>}
+     */
+    value: function()
+    {
+        var keys = {};
+        for (var i = 0; i < this.length; ++i)
+            keys[this[i]] = true;
+        return keys;
+    }
+});
+
+Object.defineProperty(Array.prototype, "pushAll",
+{
+    /**
+     * @param {!Array.<!T>} array
+     * @this {Array.<!T>}
+     * @template T
+     */
+    value: function(array)
+    {
+        Array.prototype.push.apply(this, array);
+    }
+});
+
+Object.defineProperty(Array.prototype, "rotate",
+{
+    /**
+     * @param {number} index
+     * @return {!Array.<!T>}
+     * @this {Array.<!T>}
+     * @template T
+     */
+    value: function(index)
+    {
+        var result = [];
+        for (var i = index; i < index + this.length; ++i)
+            result.push(this[i % this.length]);
+        return result;
+    }
+});
+
+Object.defineProperty(Array.prototype, "sortNumbers",
+{
+    /**
+     * @this {Array.<number>}
+     */
+    value: function()
+    {
+        /**
+         * @param {number} a
+         * @param {number} b
+         * @return {number}
+         */
+        function numericComparator(a, b)
+        {
+            return a - b;
+        }
+
+        this.sort(numericComparator);
+    }
+});
+
+Object.defineProperty(Uint32Array.prototype, "sort", {
+    value: Array.prototype.sort
+});
+
+(function() {
+var partition = {
+    /**
+     * @this {Array.<number>}
+     * @param {function(number, number): number} comparator
+     * @param {number} left
+     * @param {number} right
+     * @param {number} pivotIndex
+     */
+    value: function(comparator, left, right, pivotIndex)
+    {
+        function swap(array, i1, i2)
+        {
+            var temp = array[i1];
+            array[i1] = array[i2];
+            array[i2] = temp;
+        }
+
+        var pivotValue = this[pivotIndex];
+        swap(this, right, pivotIndex);
+        var storeIndex = left;
+        for (var i = left; i < right; ++i) {
+            if (comparator(this[i], pivotValue) < 0) {
+                swap(this, storeIndex, i);
+                ++storeIndex;
+            }
+        }
+        swap(this, right, storeIndex);
+        return storeIndex;
+    }
+};
+Object.defineProperty(Array.prototype, "partition", partition);
+Object.defineProperty(Uint32Array.prototype, "partition", partition);
+
+var sortRange = {
+    /**
+     * @param {function(number, number): number} comparator
+     * @param {number} leftBound
+     * @param {number} rightBound
+     * @param {number} sortWindowLeft
+     * @param {number} sortWindowRight
+     * @return {!Array.<number>}
+     * @this {Array.<number>}
+     */
+    value: function(comparator, leftBound, rightBound, sortWindowLeft, sortWindowRight)
+    {
+        function quickSortRange(array, comparator, left, right, sortWindowLeft, sortWindowRight)
+        {
+            if (right <= left)
+                return;
+            var pivotIndex = Math.floor(Math.random() * (right - left)) + left;
+            var pivotNewIndex = array.partition(comparator, left, right, pivotIndex);
+            if (sortWindowLeft < pivotNewIndex)
+                quickSortRange(array, comparator, left, pivotNewIndex - 1, sortWindowLeft, sortWindowRight);
+            if (pivotNewIndex < sortWindowRight)
+                quickSortRange(array, comparator, pivotNewIndex + 1, right, sortWindowLeft, sortWindowRight);
+        }
+        if (leftBound === 0 && rightBound === (this.length - 1) && sortWindowLeft === 0 && sortWindowRight >= rightBound)
+            this.sort(comparator);
+        else
+            quickSortRange(this, comparator, leftBound, rightBound, sortWindowLeft, sortWindowRight);
+        return this;
+    }
+}
+Object.defineProperty(Array.prototype, "sortRange", sortRange);
+Object.defineProperty(Uint32Array.prototype, "sortRange", sortRange);
+})();
+
+Object.defineProperty(Array.prototype, "stableSort",
+{
+    /**
+     * @param {function(?T, ?T): number=} comparator
+     * @return {!Array.<?T>}
+     * @this {Array.<?T>}
+     * @template T
+     */
+    value: function(comparator)
+    {
+        function defaultComparator(a, b)
+        {
+            return a < b ? -1 : (a > b ? 1 : 0);
+        }
+        comparator = comparator || defaultComparator;
+
+        var indices = new Array(this.length);
+        for (var i = 0; i < this.length; ++i)
+            indices[i] = i;
+        var self = this;
+        /**
+         * @param {number} a
+         * @param {number} b
+         * @return {number}
+         */
+        function indexComparator(a, b)
+        {
+            var result = comparator(self[a], self[b]);
+            return result ? result : a - b;
+        }
+        indices.sort(indexComparator);
+
+        for (var i = 0; i < this.length; ++i) {
+            if (indices[i] < 0 || i === indices[i])
+                continue;
+            var cyclical = i;
+            var saved = this[i];
+            while (true) {
+                var next = indices[cyclical];
+                indices[cyclical] = -1;
+                if (next === i) {
+                    this[cyclical] = saved;
+                    break;
+                } else {
+                    this[cyclical] = this[next];
+                    cyclical = next;
+                }
+            }
+        }
+        return this;
+    }
+});
+
+Object.defineProperty(Array.prototype, "qselect",
+{
+    /**
+     * @param {number} k
+     * @param {function(number, number): number=} comparator
+     * @return {number|undefined}
+     * @this {Array.<number>}
+     */
+    value: function(k, comparator)
+    {
+        if (k < 0 || k >= this.length)
+            return;
+        if (!comparator)
+            comparator = function(a, b) { return a - b; }
+
+        var low = 0;
+        var high = this.length - 1;
+        for (;;) {
+            var pivotPosition = this.partition(comparator, low, high, Math.floor((high + low) / 2));
+            if (pivotPosition === k)
+                return this[k];
+            else if (pivotPosition > k)
+                high = pivotPosition - 1;
+            else
+                low = pivotPosition + 1;
+        }
+    }
+});
+
+Object.defineProperty(Array.prototype, "lowerBound",
+{
+    /**
+     * Return index of the leftmost element that is equal or greater
+     * than the specimen object. If there's no such element (i.e. all
+     * elements are smaller than the specimen) returns right bound.
+     * The function works for sorted array.
+     * When specified, |left| (inclusive) and |right| (exclusive) indices
+     * define the search window.
+     *
+     * @param {!T} object
+     * @param {function(!T,!S):number=} comparator
+     * @param {number=} left
+     * @param {number=} right
+     * @return {number}
+     * @this {Array.<!S>}
+     * @template T,S
+     */
+    value: function(object, comparator, left, right)
+    {
+        function defaultComparator(a, b)
+        {
+            return a < b ? -1 : (a > b ? 1 : 0);
+        }
+        comparator = comparator || defaultComparator;
+        var l = left || 0;
+        var r = right !== undefined ? right : this.length;
+        while (l < r) {
+            var m = (l + r) >> 1;
+            if (comparator(object, this[m]) > 0)
+                l = m + 1;
+            else
+                r = m;
+        }
+        return r;
+    }
+});
+
+Object.defineProperty(Array.prototype, "upperBound",
+{
+    /**
+     * Return index of the leftmost element that is greater
+     * than the specimen object. If there's no such element (i.e. all
+     * elements are smaller or equal to the specimen) returns right bound.
+     * The function works for sorted array.
+     * When specified, |left| (inclusive) and |right| (exclusive) indices
+     * define the search window.
+     *
+     * @param {!T} object
+     * @param {function(!T,!S):number=} comparator
+     * @param {number=} left
+     * @param {number=} right
+     * @return {number}
+     * @this {Array.<!S>}
+     * @template T,S
+     */
+    value: function(object, comparator, left, right)
+    {
+        function defaultComparator(a, b)
+        {
+            return a < b ? -1 : (a > b ? 1 : 0);
+        }
+        comparator = comparator || defaultComparator;
+        var l = left || 0;
+        var r = right !== undefined ? right : this.length;
+        while (l < r) {
+            var m = (l + r) >> 1;
+            if (comparator(object, this[m]) >= 0)
+                l = m + 1;
+            else
+                r = m;
+        }
+        return r;
+    }
+});
+
+Object.defineProperty(Uint32Array.prototype, "lowerBound", {
+    value: Array.prototype.lowerBound
+});
+
+Object.defineProperty(Uint32Array.prototype, "upperBound", {
+    value: Array.prototype.upperBound
+});
+
+Object.defineProperty(Float64Array.prototype, "lowerBound", {
+    value: Array.prototype.lowerBound
+});
+
+Object.defineProperty(Array.prototype, "binaryIndexOf",
+{
+    /**
+     * @param {!T} value
+     * @param {function(!T,!S):number} comparator
+     * @return {number}
+     * @this {Array.<!S>}
+     * @template T,S
+     */
+    value: function(value, comparator)
+    {
+        var index = this.lowerBound(value, comparator);
+        return index < this.length && comparator(value, this[index]) === 0 ? index : -1;
+    }
+});
+
+Object.defineProperty(Array.prototype, "select",
+{
+    /**
+     * @param {string} field
+     * @return {!Array.<!T>}
+     * @this {Array.<!Object.<string,!T>>}
+     * @template T
+     */
+    value: function(field)
+    {
+        var result = new Array(this.length);
+        for (var i = 0; i < this.length; ++i)
+            result[i] = this[i][field];
+        return result;
+    }
+});
+
+Object.defineProperty(Array.prototype, "peekLast",
+{
+    /**
+     * @return {!T|undefined}
+     * @this {Array.<!T>}
+     * @template T
+     */
+    value: function()
+    {
+        return this[this.length - 1];
+    }
+});
+
+(function(){
+
+/**
+ * @param {!Array.<T>} array1
+ * @param {!Array.<T>} array2
+ * @param {function(T,T):number} comparator
+ * @param {boolean} mergeNotIntersect
+ * @return {!Array.<T>}
+ * @template T
+ */
+function mergeOrIntersect(array1, array2, comparator, mergeNotIntersect)
+{
+    var result = [];
+    var i = 0;
+    var j = 0;
+    while (i < array1.length && j < array2.length) {
+        var compareValue = comparator(array1[i], array2[j]);
+        if (mergeNotIntersect || !compareValue)
+            result.push(compareValue <= 0 ? array1[i] : array2[j]);
+        if (compareValue <= 0)
+            i++;
+        if (compareValue >= 0)
+            j++;
+    }
+    if (mergeNotIntersect) {
+        while (i < array1.length)
+            result.push(array1[i++]);
+        while (j < array2.length)
+            result.push(array2[j++]);
+    }
+    return result;
+}
+
+Object.defineProperty(Array.prototype, "intersectOrdered",
+{
+    /**
+     * @param {!Array.<T>} array
+     * @param {function(T,T):number} comparator
+     * @return {!Array.<T>}
+     * @this {!Array.<T>}
+     * @template T
+     */
+    value: function(array, comparator)
+    {
+        return mergeOrIntersect(this, array, comparator, false);
+    }
+});
+
+Object.defineProperty(Array.prototype, "mergeOrdered",
+{
+    /**
+     * @param {!Array.<T>} array
+     * @param {function(T,T):number} comparator
+     * @return {!Array.<T>}
+     * @this {!Array.<T>}
+     * @template T
+     */
+    value: function(array, comparator)
+    {
+        return mergeOrIntersect(this, array, comparator, true);
+    }
+});
+
+}());
+
+
+/**
+ * @param {!T} object
+ * @param {!Array.<!S>} list
+ * @param {function(!T,!S):number=} comparator
+ * @param {boolean=} insertionIndexAfter
+ * @return {number}
+ * @template T,S
+ */
+function insertionIndexForObjectInListSortedByFunction(object, list, comparator, insertionIndexAfter)
+{
+    if (insertionIndexAfter)
+        return list.upperBound(object, comparator);
+    else
+        return list.lowerBound(object, comparator);
+}
+
+/**
+ * @param {string} format
+ * @param {...*} var_arg
+ * @return {string}
+ */
+String.sprintf = function(format, var_arg)
+{
+    return String.vsprintf(format, Array.prototype.slice.call(arguments, 1));
+}
+
+/**
+ * @param {string} format
+ * @param {!Object.<string, function(string, ...):*>} formatters
+ * @return {!Array.<!Object>}
+ */
+String.tokenizeFormatString = function(format, formatters)
+{
+    var tokens = [];
+    var substitutionIndex = 0;
+
+    function addStringToken(str)
+    {
+        tokens.push({ type: "string", value: str });
+    }
+
+    function addSpecifierToken(specifier, precision, substitutionIndex)
+    {
+        tokens.push({ type: "specifier", specifier: specifier, precision: precision, substitutionIndex: substitutionIndex });
+    }
+
+    var index = 0;
+    for (var precentIndex = format.indexOf("%", index); precentIndex !== -1; precentIndex = format.indexOf("%", index)) {
+        addStringToken(format.substring(index, precentIndex));
+        index = precentIndex + 1;
+
+        if (format[index] === "%") {
+            // %% escape sequence.
+            addStringToken("%");
+            ++index;
+            continue;
+        }
+
+        if (format.isDigitAt(index)) {
+            // The first character is a number, it might be a substitution index.
+            var number = parseInt(format.substring(index), 10);
+            while (format.isDigitAt(index))
+                ++index;
+
+            // If the number is greater than zero and ends with a "$",
+            // then this is a substitution index.
+            if (number > 0 && format[index] === "$") {
+                substitutionIndex = (number - 1);
+                ++index;
+            }
+        }
+
+        var precision = -1;
+        if (format[index] === ".") {
+            // This is a precision specifier. If no digit follows the ".",
+            // then the precision should be zero.
+            ++index;
+            precision = parseInt(format.substring(index), 10);
+            if (isNaN(precision))
+                precision = 0;
+
+            while (format.isDigitAt(index))
+                ++index;
+        }
+
+        if (!(format[index] in formatters)) {
+            addStringToken(format.substring(precentIndex, index + 1));
+            ++index;
+            continue;
+        }
+
+        addSpecifierToken(format[index], precision, substitutionIndex);
+
+        ++substitutionIndex;
+        ++index;
+    }
+
+    addStringToken(format.substring(index));
+
+    return tokens;
+}
+
+String.standardFormatters = {
+    /**
+     * @return {number}
+     */
+    d: function(substitution)
+    {
+        return !isNaN(substitution) ? substitution : 0;
+    },
+
+    /**
+     * @return {number}
+     */
+    f: function(substitution, token)
+    {
+        if (substitution && token.precision > -1)
+            substitution = substitution.toFixed(token.precision);
+        return !isNaN(substitution) ? substitution : (token.precision > -1 ? Number(0).toFixed(token.precision) : 0);
+    },
+
+    /**
+     * @return {string}
+     */
+    s: function(substitution)
+    {
+        return substitution;
+    }
+}
+
+/**
+ * @param {string} format
+ * @param {!Array.<*>} substitutions
+ * @return {string}
+ */
+String.vsprintf = function(format, substitutions)
+{
+    return String.format(format, substitutions, String.standardFormatters, "", function(a, b) { return a + b; }).formattedResult;
+}
+
+/**
+ * @param {string} format
+ * @param {?ArrayLike} substitutions
+ * @param {!Object.<string, function(string, ...):string>} formatters
+ * @param {!T} initialValue
+ * @param {function(T, string): T|undefined} append
+ * @param {!Array.<!Object>=} tokenizedFormat
+ * @return {!{formattedResult: T, unusedSubstitutions: ?ArrayLike}};
+ * @template T
+ */
+String.format = function(format, substitutions, formatters, initialValue, append, tokenizedFormat)
+{
+    if (!format || !substitutions || !substitutions.length)
+        return { formattedResult: append(initialValue, format), unusedSubstitutions: substitutions };
+
+    function prettyFunctionName()
+    {
+        return "String.format(\"" + format + "\", \"" + Array.prototype.join.call(substitutions, "\", \"") + "\")";
+    }
+
+    function warn(msg)
+    {
+        console.warn(prettyFunctionName() + ": " + msg);
+    }
+
+    function error(msg)
+    {
+        console.error(prettyFunctionName() + ": " + msg);
+    }
+
+    var result = initialValue;
+    var tokens = tokenizedFormat || String.tokenizeFormatString(format, formatters);
+    var usedSubstitutionIndexes = {};
+
+    for (var i = 0; i < tokens.length; ++i) {
+        var token = tokens[i];
+
+        if (token.type === "string") {
+            result = append(result, token.value);
+            continue;
+        }
+
+        if (token.type !== "specifier") {
+            error("Unknown token type \"" + token.type + "\" found.");
+            continue;
+        }
+
+        if (token.substitutionIndex >= substitutions.length) {
+            // If there are not enough substitutions for the current substitutionIndex
+            // just output the format specifier literally and move on.
+            error("not enough substitution arguments. Had " + substitutions.length + " but needed " + (token.substitutionIndex + 1) + ", so substitution was skipped.");
+            result = append(result, "%" + (token.precision > -1 ? token.precision : "") + token.specifier);
+            continue;
+        }
+
+        usedSubstitutionIndexes[token.substitutionIndex] = true;
+
+        if (!(token.specifier in formatters)) {
+            // Encountered an unsupported format character, treat as a string.
+            warn("unsupported format character \u201C" + token.specifier + "\u201D. Treating as a string.");
+            result = append(result, substitutions[token.substitutionIndex]);
+            continue;
+        }
+
+        result = append(result, formatters[token.specifier](substitutions[token.substitutionIndex], token));
+    }
+
+    var unusedSubstitutions = [];
+    for (var i = 0; i < substitutions.length; ++i) {
+        if (i in usedSubstitutionIndexes)
+            continue;
+        unusedSubstitutions.push(substitutions[i]);
+    }
+
+    return { formattedResult: result, unusedSubstitutions: unusedSubstitutions };
+}
+
+/**
+ * @param {string} query
+ * @param {boolean} caseSensitive
+ * @param {boolean} isRegex
+ * @return {!RegExp}
+ */
+function createSearchRegex(query, caseSensitive, isRegex)
+{
+    var regexFlags = caseSensitive ? "g" : "gi";
+    var regexObject;
+
+    if (isRegex) {
+        try {
+            regexObject = new RegExp(query, regexFlags);
+        } catch (e) {
+            // Silent catch.
+        }
+    }
+
+    if (!regexObject)
+        regexObject = createPlainTextSearchRegex(query, regexFlags);
+
+    return regexObject;
+}
+
+/**
+ * @param {string} query
+ * @param {string=} flags
+ * @return {!RegExp}
+ */
+function createPlainTextSearchRegex(query, flags)
+{
+    // This should be kept the same as the one in ContentSearchUtils.cpp.
+    var regexSpecialCharacters = String.regexSpecialCharacters();
+    var regex = "";
+    for (var i = 0; i < query.length; ++i) {
+        var c = query.charAt(i);
+        if (regexSpecialCharacters.indexOf(c) != -1)
+            regex += "\\";
+        regex += c;
+    }
+    return new RegExp(regex, flags || "");
+}
+
+/**
+ * @param {!RegExp} regex
+ * @param {string} content
+ * @return {number}
+ */
+function countRegexMatches(regex, content)
+{
+    var text = content;
+    var result = 0;
+    var match;
+    while (text && (match = regex.exec(text))) {
+        if (match[0].length > 0)
+            ++result;
+        text = text.substring(match.index + 1);
+    }
+    return result;
+}
+
+/**
+ * @param {number} spacesCount
+ * @return {string}
+ */
+function spacesPadding(spacesCount)
+{
+    return Array(spacesCount).join("\u00a0");
+}
+
+/**
+ * @param {number} value
+ * @param {number} symbolsCount
+ * @return {string}
+ */
+function numberToStringWithSpacesPadding(value, symbolsCount)
+{
+    var numberString = value.toString();
+    var paddingLength = Math.max(0, symbolsCount - numberString.length);
+    return spacesPadding(paddingLength) + numberString;
+}
+
+/**
+ * @param {!Iterator.<T>} iterator
+ * @return {!Array.<T>}
+ * @template T
+ */
+Array.from = function(iterator)
+{
+    var values = [];
+    for (var iteratorValue = iterator.next(); !iteratorValue.done; iteratorValue = iterator.next())
+        values.push(iteratorValue.value);
+    return values;
+}
+
+/**
+ * @param {!Array.<!T>} array
+ * @return {!Set.<T>}
+ * @template T
+ */
+Set.fromArray = function(array)
+{
+    return new Set(array);
+}
+
+/**
+ * @return {!Array.<T>}
+ * @template T
+ */
+Set.prototype.valuesArray = function()
+{
+    return Array.from(this.values());
+}
+
+Set.prototype.remove = Set.prototype.delete;
+
+/**
+ * @return {T}
+ * @template T
+ */
+Map.prototype.remove = function(key)
+{
+    var value = this.get(key);
+    this.delete(key);
+    return value;
+}
+
+/**
+ * @return {!Array.<V>}
+ * @template K, V
+ * @this {Map.<K, V>}
+ */
+Map.prototype.valuesArray = function()
+{
+    return Array.from(this.values());
+}
+
+/**
+ * @return {!Array.<K>}
+ * @template K, V
+ * @this {Map.<K, V>}
+ */
+Map.prototype.keysArray = function()
+{
+    return Array.from(this.keys());
+}
+
+/**
+ * @constructor
+ * @template T
+ */
+var StringMultimap = function()
+{
+    /** @type {!Map.<string, !Set.<!T>>} */
+    this._map = new Map();
+}
+
+StringMultimap.prototype = {
+    /**
+     * @param {string} key
+     * @param {T} value
+     */
+    set: function(key, value)
+    {
+        var set = this._map.get(key);
+        if (!set) {
+            set = new Set();
+            this._map.set(key, set);
+        }
+        set.add(value);
+    },
+
+    /**
+     * @param {string} key
+     * @return {!Set.<!T>}
+     */
+    get: function(key)
+    {
+        var result = this._map.get(key);
+        if (!result)
+            result = new Set();
+        return result;
+    },
+
+    /**
+     * @param {string} key
+     * @param {T} value
+     */
+    remove: function(key, value)
+    {
+        var values = this.get(key);
+        values.remove(value);
+        if (!values.size)
+            this._map.remove(key)
+    },
+
+    /**
+     * @param {string} key
+     */
+    removeAll: function(key)
+    {
+        this._map.remove(key)
+    },
+
+    /**
+     * @return {!Array.<string>}
+     */
+    keysArray: function()
+    {
+        return this._map.keysArray();
+    },
+
+    /**
+     * @return {!Array.<!T>}
+     */
+    valuesArray: function()
+    {
+        var result = [];
+        var keys = this.keysArray();
+        for (var i = 0; i < keys.length; ++i)
+            result.pushAll(this.get(keys[i]).valuesArray());
+        return result;
+    },
+
+    clear: function()
+    {
+        this._map.clear();
+    }
+}
+
+/**
+ * @param {string} url
+ * @return {!Promise.<string>}
+ */
+function loadXHR(url)
+{
+    return new Promise(load);
+
+    function load(successCallback, failureCallback)
+    {
+        function onReadyStateChanged()
+        {
+            if (xhr.readyState !== XMLHttpRequest.DONE)
+                return;
+            if (xhr.status !== 200) {
+                xhr.onreadystatechange = null;
+                failureCallback(new Error(xhr.status));
+                return;
+            }
+            xhr.onreadystatechange = null;
+            successCallback(xhr.responseText);
+        }
+
+        var xhr = new XMLHttpRequest();
+        xhr.open("GET", url, true);
+        xhr.onreadystatechange = onReadyStateChanged;
+        xhr.send(null);
+    }
+}
+
+/**
+ * @constructor
+ */
+function CallbackBarrier()
+{
+    this._pendingIncomingCallbacksCount = 0;
+}
+
+CallbackBarrier.prototype = {
+    /**
+     * @param {function(...)=} userCallback
+     * @return {function(...)}
+     */
+    createCallback: function(userCallback)
+    {
+        console.assert(!this._outgoingCallback, "CallbackBarrier.createCallback() is called after CallbackBarrier.callWhenDone()");
+        ++this._pendingIncomingCallbacksCount;
+        return this._incomingCallback.bind(this, userCallback);
+    },
+
+    /**
+     * @param {function()} callback
+     */
+    callWhenDone: function(callback)
+    {
+        console.assert(!this._outgoingCallback, "CallbackBarrier.callWhenDone() is called multiple times");
+        this._outgoingCallback = callback;
+        if (!this._pendingIncomingCallbacksCount)
+            this._outgoingCallback();
+    },
+
+    /**
+     * @param {function(...)=} userCallback
+     */
+    _incomingCallback: function(userCallback)
+    {
+        console.assert(this._pendingIncomingCallbacksCount > 0);
+        if (userCallback) {
+            var args = Array.prototype.slice.call(arguments, 1);
+            userCallback.apply(null, args);
+        }
+        if (!--this._pendingIncomingCallbacksCount && this._outgoingCallback)
+            this._outgoingCallback();
+    }
+}
+
+/**
+ * @param {*} value
+ */
+function suppressUnused(value)
+{
+}
+
+/**
+ * @param {function()} callback
+ * @return {number}
+ */
+self.setImmediate = function(callback)
+{
+    Promise.resolve().then(callback).done();
+    return 0;
+}