From bcf9b230be6d74c71567fd0771b31d47d8dd39c7 Mon Sep 17 00:00:00 2001 From: Brian Picciano Date: Thu, 21 Jan 2021 17:22:53 -0700 Subject: build the blog with nix --- src/assets/viz/2/goog/string/string.js | 1641 ++++++++++++++++++++++++++++++++ 1 file changed, 1641 insertions(+) create mode 100644 src/assets/viz/2/goog/string/string.js (limited to 'src/assets/viz/2/goog/string/string.js') diff --git a/src/assets/viz/2/goog/string/string.js b/src/assets/viz/2/goog/string/string.js new file mode 100644 index 0000000..7a10ae0 --- /dev/null +++ b/src/assets/viz/2/goog/string/string.js @@ -0,0 +1,1641 @@ +// Copyright 2006 The Closure Library Authors. All Rights Reserved. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS-IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +/** + * @fileoverview Utilities for string manipulation. + * @author arv@google.com (Erik Arvidsson) + */ + + +/** + * Namespace for string utilities + */ +goog.provide('goog.string'); +goog.provide('goog.string.Unicode'); + + +/** + * @define {boolean} Enables HTML escaping of lowercase letter "e" which helps + * with detection of double-escaping as this letter is frequently used. + */ +goog.define('goog.string.DETECT_DOUBLE_ESCAPING', false); + + +/** + * @define {boolean} Whether to force non-dom html unescaping. + */ +goog.define('goog.string.FORCE_NON_DOM_HTML_UNESCAPING', false); + + +/** + * Common Unicode string characters. + * @enum {string} + */ +goog.string.Unicode = { + NBSP: '\xa0' +}; + + +/** + * Fast prefix-checker. + * @param {string} str The string to check. + * @param {string} prefix A string to look for at the start of {@code str}. + * @return {boolean} True if {@code str} begins with {@code prefix}. + */ +goog.string.startsWith = function(str, prefix) { + return str.lastIndexOf(prefix, 0) == 0; +}; + + +/** + * Fast suffix-checker. + * @param {string} str The string to check. + * @param {string} suffix A string to look for at the end of {@code str}. + * @return {boolean} True if {@code str} ends with {@code suffix}. + */ +goog.string.endsWith = function(str, suffix) { + var l = str.length - suffix.length; + return l >= 0 && str.indexOf(suffix, l) == l; +}; + + +/** + * Case-insensitive prefix-checker. + * @param {string} str The string to check. + * @param {string} prefix A string to look for at the end of {@code str}. + * @return {boolean} True if {@code str} begins with {@code prefix} (ignoring + * case). + */ +goog.string.caseInsensitiveStartsWith = function(str, prefix) { + return goog.string.caseInsensitiveCompare( + prefix, str.substr(0, prefix.length)) == 0; +}; + + +/** + * Case-insensitive suffix-checker. + * @param {string} str The string to check. + * @param {string} suffix A string to look for at the end of {@code str}. + * @return {boolean} True if {@code str} ends with {@code suffix} (ignoring + * case). + */ +goog.string.caseInsensitiveEndsWith = function(str, suffix) { + return ( + goog.string.caseInsensitiveCompare( + suffix, str.substr(str.length - suffix.length, suffix.length)) == 0); +}; + + +/** + * Case-insensitive equality checker. + * @param {string} str1 First string to check. + * @param {string} str2 Second string to check. + * @return {boolean} True if {@code str1} and {@code str2} are the same string, + * ignoring case. + */ +goog.string.caseInsensitiveEquals = function(str1, str2) { + return str1.toLowerCase() == str2.toLowerCase(); +}; + + +/** + * Does simple python-style string substitution. + * subs("foo%s hot%s", "bar", "dog") becomes "foobar hotdog". + * @param {string} str The string containing the pattern. + * @param {...*} var_args The items to substitute into the pattern. + * @return {string} A copy of {@code str} in which each occurrence of + * {@code %s} has been replaced an argument from {@code var_args}. + */ +goog.string.subs = function(str, var_args) { + var splitParts = str.split('%s'); + var returnString = ''; + + var subsArguments = Array.prototype.slice.call(arguments, 1); + while (subsArguments.length && + // Replace up to the last split part. We are inserting in the + // positions between split parts. + splitParts.length > 1) { + returnString += splitParts.shift() + subsArguments.shift(); + } + + return returnString + splitParts.join('%s'); // Join unused '%s' +}; + + +/** + * Converts multiple whitespace chars (spaces, non-breaking-spaces, new lines + * and tabs) to a single space, and strips leading and trailing whitespace. + * @param {string} str Input string. + * @return {string} A copy of {@code str} with collapsed whitespace. + */ +goog.string.collapseWhitespace = function(str) { + // Since IE doesn't include non-breaking-space (0xa0) in their \s character + // class (as required by section 7.2 of the ECMAScript spec), we explicitly + // include it in the regexp to enforce consistent cross-browser behavior. + return str.replace(/[\s\xa0]+/g, ' ').replace(/^\s+|\s+$/g, ''); +}; + + +/** + * Checks if a string is empty or contains only whitespaces. + * @param {string} str The string to check. + * @return {boolean} Whether {@code str} is empty or whitespace only. + */ +goog.string.isEmptyOrWhitespace = function(str) { + // testing length == 0 first is actually slower in all browsers (about the + // same in Opera). + // Since IE doesn't include non-breaking-space (0xa0) in their \s character + // class (as required by section 7.2 of the ECMAScript spec), we explicitly + // include it in the regexp to enforce consistent cross-browser behavior. + return /^[\s\xa0]*$/.test(str); +}; + + +/** + * Checks if a string is empty. + * @param {string} str The string to check. + * @return {boolean} Whether {@code str} is empty. + */ +goog.string.isEmptyString = function(str) { + return str.length == 0; +}; + + +/** + * Checks if a string is empty or contains only whitespaces. + * + * @param {string} str The string to check. + * @return {boolean} Whether {@code str} is empty or whitespace only. + * @deprecated Use goog.string.isEmptyOrWhitespace instead. + */ +goog.string.isEmpty = goog.string.isEmptyOrWhitespace; + + +/** + * Checks if a string is null, undefined, empty or contains only whitespaces. + * @param {*} str The string to check. + * @return {boolean} Whether {@code str} is null, undefined, empty, or + * whitespace only. + * @deprecated Use goog.string.isEmptyOrWhitespace(goog.string.makeSafe(str)) + * instead. + */ +goog.string.isEmptyOrWhitespaceSafe = function(str) { + return goog.string.isEmptyOrWhitespace(goog.string.makeSafe(str)); +}; + + +/** + * Checks if a string is null, undefined, empty or contains only whitespaces. + * + * @param {*} str The string to check. + * @return {boolean} Whether {@code str} is null, undefined, empty, or + * whitespace only. + * @deprecated Use goog.string.isEmptyOrWhitespace instead. + */ +goog.string.isEmptySafe = goog.string.isEmptyOrWhitespaceSafe; + + +/** + * Checks if a string is all breaking whitespace. + * @param {string} str The string to check. + * @return {boolean} Whether the string is all breaking whitespace. + */ +goog.string.isBreakingWhitespace = function(str) { + return !/[^\t\n\r ]/.test(str); +}; + + +/** + * Checks if a string contains all letters. + * @param {string} str string to check. + * @return {boolean} True if {@code str} consists entirely of letters. + */ +goog.string.isAlpha = function(str) { + return !/[^a-zA-Z]/.test(str); +}; + + +/** + * Checks if a string contains only numbers. + * @param {*} str string to check. If not a string, it will be + * casted to one. + * @return {boolean} True if {@code str} is numeric. + */ +goog.string.isNumeric = function(str) { + return !/[^0-9]/.test(str); +}; + + +/** + * Checks if a string contains only numbers or letters. + * @param {string} str string to check. + * @return {boolean} True if {@code str} is alphanumeric. + */ +goog.string.isAlphaNumeric = function(str) { + return !/[^a-zA-Z0-9]/.test(str); +}; + + +/** + * Checks if a character is a space character. + * @param {string} ch Character to check. + * @return {boolean} True if {@code ch} is a space. + */ +goog.string.isSpace = function(ch) { + return ch == ' '; +}; + + +/** + * Checks if a character is a valid unicode character. + * @param {string} ch Character to check. + * @return {boolean} True if {@code ch} is a valid unicode character. + */ +goog.string.isUnicodeChar = function(ch) { + return ch.length == 1 && ch >= ' ' && ch <= '~' || + ch >= '\u0080' && ch <= '\uFFFD'; +}; + + +/** + * Takes a string and replaces newlines with a space. Multiple lines are + * replaced with a single space. + * @param {string} str The string from which to strip newlines. + * @return {string} A copy of {@code str} stripped of newlines. + */ +goog.string.stripNewlines = function(str) { + return str.replace(/(\r\n|\r|\n)+/g, ' '); +}; + + +/** + * Replaces Windows and Mac new lines with unix style: \r or \r\n with \n. + * @param {string} str The string to in which to canonicalize newlines. + * @return {string} {@code str} A copy of {@code} with canonicalized newlines. + */ +goog.string.canonicalizeNewlines = function(str) { + return str.replace(/(\r\n|\r|\n)/g, '\n'); +}; + + +/** + * Normalizes whitespace in a string, replacing all whitespace chars with + * a space. + * @param {string} str The string in which to normalize whitespace. + * @return {string} A copy of {@code str} with all whitespace normalized. + */ +goog.string.normalizeWhitespace = function(str) { + return str.replace(/\xa0|\s/g, ' '); +}; + + +/** + * Normalizes spaces in a string, replacing all consecutive spaces and tabs + * with a single space. Replaces non-breaking space with a space. + * @param {string} str The string in which to normalize spaces. + * @return {string} A copy of {@code str} with all consecutive spaces and tabs + * replaced with a single space. + */ +goog.string.normalizeSpaces = function(str) { + return str.replace(/\xa0|[ \t]+/g, ' '); +}; + + +/** + * Removes the breaking spaces from the left and right of the string and + * collapses the sequences of breaking spaces in the middle into single spaces. + * The original and the result strings render the same way in HTML. + * @param {string} str A string in which to collapse spaces. + * @return {string} Copy of the string with normalized breaking spaces. + */ +goog.string.collapseBreakingSpaces = function(str) { + return str.replace(/[\t\r\n ]+/g, ' ') + .replace(/^[\t\r\n ]+|[\t\r\n ]+$/g, ''); +}; + + +/** + * Trims white spaces to the left and right of a string. + * @param {string} str The string to trim. + * @return {string} A trimmed copy of {@code str}. + */ +goog.string.trim = + (goog.TRUSTED_SITE && String.prototype.trim) ? function(str) { + return str.trim(); + } : function(str) { + // Since IE doesn't include non-breaking-space (0xa0) in their \s + // character class (as required by section 7.2 of the ECMAScript spec), + // we explicitly include it in the regexp to enforce consistent + // cross-browser behavior. + return str.replace(/^[\s\xa0]+|[\s\xa0]+$/g, ''); + }; + + +/** + * Trims whitespaces at the left end of a string. + * @param {string} str The string to left trim. + * @return {string} A trimmed copy of {@code str}. + */ +goog.string.trimLeft = function(str) { + // Since IE doesn't include non-breaking-space (0xa0) in their \s character + // class (as required by section 7.2 of the ECMAScript spec), we explicitly + // include it in the regexp to enforce consistent cross-browser behavior. + return str.replace(/^[\s\xa0]+/, ''); +}; + + +/** + * Trims whitespaces at the right end of a string. + * @param {string} str The string to right trim. + * @return {string} A trimmed copy of {@code str}. + */ +goog.string.trimRight = function(str) { + // Since IE doesn't include non-breaking-space (0xa0) in their \s character + // class (as required by section 7.2 of the ECMAScript spec), we explicitly + // include it in the regexp to enforce consistent cross-browser behavior. + return str.replace(/[\s\xa0]+$/, ''); +}; + + +/** + * A string comparator that ignores case. + * -1 = str1 less than str2 + * 0 = str1 equals str2 + * 1 = str1 greater than str2 + * + * @param {string} str1 The string to compare. + * @param {string} str2 The string to compare {@code str1} to. + * @return {number} The comparator result, as described above. + */ +goog.string.caseInsensitiveCompare = function(str1, str2) { + var test1 = String(str1).toLowerCase(); + var test2 = String(str2).toLowerCase(); + + if (test1 < test2) { + return -1; + } else if (test1 == test2) { + return 0; + } else { + return 1; + } +}; + + +/** + * Compares two strings interpreting their numeric substrings as numbers. + * + * @param {string} str1 First string. + * @param {string} str2 Second string. + * @param {!RegExp} tokenizerRegExp Splits a string into substrings of + * non-negative integers, non-numeric characters and optionally fractional + * numbers starting with a decimal point. + * @return {number} Negative if str1 < str2, 0 is str1 == str2, positive if + * str1 > str2. + * @private + */ +goog.string.numberAwareCompare_ = function(str1, str2, tokenizerRegExp) { + if (str1 == str2) { + return 0; + } + if (!str1) { + return -1; + } + if (!str2) { + return 1; + } + + // Using match to split the entire string ahead of time turns out to be faster + // for most inputs than using RegExp.exec or iterating over each character. + var tokens1 = str1.toLowerCase().match(tokenizerRegExp); + var tokens2 = str2.toLowerCase().match(tokenizerRegExp); + + var count = Math.min(tokens1.length, tokens2.length); + + for (var i = 0; i < count; i++) { + var a = tokens1[i]; + var b = tokens2[i]; + + // Compare pairs of tokens, returning if one token sorts before the other. + if (a != b) { + // Only if both tokens are integers is a special comparison required. + // Decimal numbers are sorted as strings (e.g., '.09' < '.1'). + var num1 = parseInt(a, 10); + if (!isNaN(num1)) { + var num2 = parseInt(b, 10); + if (!isNaN(num2) && num1 - num2) { + return num1 - num2; + } + } + return a < b ? -1 : 1; + } + } + + // If one string is a substring of the other, the shorter string sorts first. + if (tokens1.length != tokens2.length) { + return tokens1.length - tokens2.length; + } + + // The two strings must be equivalent except for case (perfect equality is + // tested at the head of the function.) Revert to default ASCII string + // comparison to stabilize the sort. + return str1 < str2 ? -1 : 1; +}; + + +/** + * String comparison function that handles non-negative integer numbers in a + * way humans might expect. Using this function, the string 'File 2.jpg' sorts + * before 'File 10.jpg', and 'Version 1.9' before 'Version 1.10'. The comparison + * is mostly case-insensitive, though strings that are identical except for case + * are sorted with the upper-case strings before lower-case. + * + * This comparison function is up to 50x slower than either the default or the + * case-insensitive compare. It should not be used in time-critical code, but + * should be fast enough to sort several hundred short strings (like filenames) + * with a reasonable delay. + * + * @param {string} str1 The string to compare in a numerically sensitive way. + * @param {string} str2 The string to compare {@code str1} to. + * @return {number} less than 0 if str1 < str2, 0 if str1 == str2, greater than + * 0 if str1 > str2. + */ +goog.string.intAwareCompare = function(str1, str2) { + return goog.string.numberAwareCompare_(str1, str2, /\d+|\D+/g); +}; + + +/** + * String comparison function that handles non-negative integer and fractional + * numbers in a way humans might expect. Using this function, the string + * 'File 2.jpg' sorts before 'File 10.jpg', and '3.14' before '3.2'. Equivalent + * to {@link goog.string.intAwareCompare} apart from the way how it interprets + * dots. + * + * @param {string} str1 The string to compare in a numerically sensitive way. + * @param {string} str2 The string to compare {@code str1} to. + * @return {number} less than 0 if str1 < str2, 0 if str1 == str2, greater than + * 0 if str1 > str2. + */ +goog.string.floatAwareCompare = function(str1, str2) { + return goog.string.numberAwareCompare_(str1, str2, /\d+|\.\d+|\D+/g); +}; + + +/** + * Alias for {@link goog.string.floatAwareCompare}. + * + * @param {string} str1 + * @param {string} str2 + * @return {number} + */ +goog.string.numerateCompare = goog.string.floatAwareCompare; + + +/** + * URL-encodes a string + * @param {*} str The string to url-encode. + * @return {string} An encoded copy of {@code str} that is safe for urls. + * Note that '#', ':', and other characters used to delimit portions + * of URLs *will* be encoded. + */ +goog.string.urlEncode = function(str) { + return encodeURIComponent(String(str)); +}; + + +/** + * URL-decodes the string. We need to specially handle '+'s because + * the javascript library doesn't convert them to spaces. + * @param {string} str The string to url decode. + * @return {string} The decoded {@code str}. + */ +goog.string.urlDecode = function(str) { + return decodeURIComponent(str.replace(/\+/g, ' ')); +}; + + +/** + * Converts \n to
s or
s. + * @param {string} str The string in which to convert newlines. + * @param {boolean=} opt_xml Whether to use XML compatible tags. + * @return {string} A copy of {@code str} with converted newlines. + */ +goog.string.newLineToBr = function(str, opt_xml) { + return str.replace(/(\r\n|\r|\n)/g, opt_xml ? '
' : '
'); +}; + + +/** + * Escapes double quote '"' and single quote '\'' characters in addition to + * '&', '<', and '>' so that a string can be included in an HTML tag attribute + * value within double or single quotes. + * + * It should be noted that > doesn't need to be escaped for the HTML or XML to + * be valid, but it has been decided to escape it for consistency with other + * implementations. + * + * With goog.string.DETECT_DOUBLE_ESCAPING, this function escapes also the + * lowercase letter "e". + * + * NOTE(user): + * HtmlEscape is often called during the generation of large blocks of HTML. + * Using statics for the regular expressions and strings is an optimization + * that can more than half the amount of time IE spends in this function for + * large apps, since strings and regexes both contribute to GC allocations. + * + * Testing for the presence of a character before escaping increases the number + * of function calls, but actually provides a speed increase for the average + * case -- since the average case often doesn't require the escaping of all 4 + * characters and indexOf() is much cheaper than replace(). + * The worst case does suffer slightly from the additional calls, therefore the + * opt_isLikelyToContainHtmlChars option has been included for situations + * where all 4 HTML entities are very likely to be present and need escaping. + * + * Some benchmarks (times tended to fluctuate +-0.05ms): + * FireFox IE6 + * (no chars / average (mix of cases) / all 4 chars) + * no checks 0.13 / 0.22 / 0.22 0.23 / 0.53 / 0.80 + * indexOf 0.08 / 0.17 / 0.26 0.22 / 0.54 / 0.84 + * indexOf + re test 0.07 / 0.17 / 0.28 0.19 / 0.50 / 0.85 + * + * An additional advantage of checking if replace actually needs to be called + * is a reduction in the number of object allocations, so as the size of the + * application grows the difference between the various methods would increase. + * + * @param {string} str string to be escaped. + * @param {boolean=} opt_isLikelyToContainHtmlChars Don't perform a check to see + * if the character needs replacing - use this option if you expect each of + * the characters to appear often. Leave false if you expect few html + * characters to occur in your strings, such as if you are escaping HTML. + * @return {string} An escaped copy of {@code str}. + */ +goog.string.htmlEscape = function(str, opt_isLikelyToContainHtmlChars) { + + if (opt_isLikelyToContainHtmlChars) { + str = str.replace(goog.string.AMP_RE_, '&') + .replace(goog.string.LT_RE_, '<') + .replace(goog.string.GT_RE_, '>') + .replace(goog.string.QUOT_RE_, '"') + .replace(goog.string.SINGLE_QUOTE_RE_, ''') + .replace(goog.string.NULL_RE_, '�'); + if (goog.string.DETECT_DOUBLE_ESCAPING) { + str = str.replace(goog.string.E_RE_, 'e'); + } + return str; + + } else { + // quick test helps in the case when there are no chars to replace, in + // worst case this makes barely a difference to the time taken + if (!goog.string.ALL_RE_.test(str)) return str; + + // str.indexOf is faster than regex.test in this case + if (str.indexOf('&') != -1) { + str = str.replace(goog.string.AMP_RE_, '&'); + } + if (str.indexOf('<') != -1) { + str = str.replace(goog.string.LT_RE_, '<'); + } + if (str.indexOf('>') != -1) { + str = str.replace(goog.string.GT_RE_, '>'); + } + if (str.indexOf('"') != -1) { + str = str.replace(goog.string.QUOT_RE_, '"'); + } + if (str.indexOf('\'') != -1) { + str = str.replace(goog.string.SINGLE_QUOTE_RE_, '''); + } + if (str.indexOf('\x00') != -1) { + str = str.replace(goog.string.NULL_RE_, '�'); + } + if (goog.string.DETECT_DOUBLE_ESCAPING && str.indexOf('e') != -1) { + str = str.replace(goog.string.E_RE_, 'e'); + } + return str; + } +}; + + +/** + * Regular expression that matches an ampersand, for use in escaping. + * @const {!RegExp} + * @private + */ +goog.string.AMP_RE_ = /&/g; + + +/** + * Regular expression that matches a less than sign, for use in escaping. + * @const {!RegExp} + * @private + */ +goog.string.LT_RE_ = //g; + + +/** + * Regular expression that matches a double quote, for use in escaping. + * @const {!RegExp} + * @private + */ +goog.string.QUOT_RE_ = /"/g; + + +/** + * Regular expression that matches a single quote, for use in escaping. + * @const {!RegExp} + * @private + */ +goog.string.SINGLE_QUOTE_RE_ = /'/g; + + +/** + * Regular expression that matches null character, for use in escaping. + * @const {!RegExp} + * @private + */ +goog.string.NULL_RE_ = /\x00/g; + + +/** + * Regular expression that matches a lowercase letter "e", for use in escaping. + * @const {!RegExp} + * @private + */ +goog.string.E_RE_ = /e/g; + + +/** + * Regular expression that matches any character that needs to be escaped. + * @const {!RegExp} + * @private + */ +goog.string.ALL_RE_ = + (goog.string.DETECT_DOUBLE_ESCAPING ? /[\x00&<>"'e]/ : /[\x00&<>"']/); + + +/** + * Unescapes an HTML string. + * + * @param {string} str The string to unescape. + * @return {string} An unescaped copy of {@code str}. + */ +goog.string.unescapeEntities = function(str) { + if (goog.string.contains(str, '&')) { + // We are careful not to use a DOM if we do not have one or we explicitly + // requested non-DOM html unescaping. + if (!goog.string.FORCE_NON_DOM_HTML_UNESCAPING && + 'document' in goog.global) { + return goog.string.unescapeEntitiesUsingDom_(str); + } else { + // Fall back on pure XML entities + return goog.string.unescapePureXmlEntities_(str); + } + } + return str; +}; + + +/** + * Unescapes a HTML string using the provided document. + * + * @param {string} str The string to unescape. + * @param {!Document} document A document to use in escaping the string. + * @return {string} An unescaped copy of {@code str}. + */ +goog.string.unescapeEntitiesWithDocument = function(str, document) { + if (goog.string.contains(str, '&')) { + return goog.string.unescapeEntitiesUsingDom_(str, document); + } + return str; +}; + + +/** + * Unescapes an HTML string using a DOM to resolve non-XML, non-numeric + * entities. This function is XSS-safe and whitespace-preserving. + * @private + * @param {string} str The string to unescape. + * @param {Document=} opt_document An optional document to use for creating + * elements. If this is not specified then the default window.document + * will be used. + * @return {string} The unescaped {@code str} string. + */ +goog.string.unescapeEntitiesUsingDom_ = function(str, opt_document) { + /** @type {!Object} */ + var seen = {'&': '&', '<': '<', '>': '>', '"': '"'}; + var div; + if (opt_document) { + div = opt_document.createElement('div'); + } else { + div = goog.global.document.createElement('div'); + } + // Match as many valid entity characters as possible. If the actual entity + // happens to be shorter, it will still work as innerHTML will return the + // trailing characters unchanged. Since the entity characters do not include + // open angle bracket, there is no chance of XSS from the innerHTML use. + // Since no whitespace is passed to innerHTML, whitespace is preserved. + return str.replace(goog.string.HTML_ENTITY_PATTERN_, function(s, entity) { + // Check for cached entity. + var value = seen[s]; + if (value) { + return value; + } + // Check for numeric entity. + if (entity.charAt(0) == '#') { + // Prefix with 0 so that hex entities (e.g. ) parse as hex numbers. + var n = Number('0' + entity.substr(1)); + if (!isNaN(n)) { + value = String.fromCharCode(n); + } + } + // Fall back to innerHTML otherwise. + if (!value) { + // Append a non-entity character to avoid a bug in Webkit that parses + // an invalid entity at the end of innerHTML text as the empty string. + div.innerHTML = s + ' '; + // Then remove the trailing character from the result. + value = div.firstChild.nodeValue.slice(0, -1); + } + // Cache and return. + return seen[s] = value; + }); +}; + + +/** + * Unescapes XML entities. + * @private + * @param {string} str The string to unescape. + * @return {string} An unescaped copy of {@code str}. + */ +goog.string.unescapePureXmlEntities_ = function(str) { + return str.replace(/&([^;]+);/g, function(s, entity) { + switch (entity) { + case 'amp': + return '&'; + case 'lt': + return '<'; + case 'gt': + return '>'; + case 'quot': + return '"'; + default: + if (entity.charAt(0) == '#') { + // Prefix with 0 so that hex entities (e.g. ) parse as hex. + var n = Number('0' + entity.substr(1)); + if (!isNaN(n)) { + return String.fromCharCode(n); + } + } + // For invalid entities we just return the entity + return s; + } + }); +}; + + +/** + * Regular expression that matches an HTML entity. + * See also HTML5: Tokenization / Tokenizing character references. + * @private + * @type {!RegExp} + */ +goog.string.HTML_ENTITY_PATTERN_ = /&([^;\s<&]+);?/g; + + +/** + * Do escaping of whitespace to preserve spatial formatting. We use character + * entity #160 to make it safer for xml. + * @param {string} str The string in which to escape whitespace. + * @param {boolean=} opt_xml Whether to use XML compatible tags. + * @return {string} An escaped copy of {@code str}. + */ +goog.string.whitespaceEscape = function(str, opt_xml) { + // This doesn't use goog.string.preserveSpaces for backwards compatibility. + return goog.string.newLineToBr(str.replace(/ /g, '  '), opt_xml); +}; + + +/** + * Preserve spaces that would be otherwise collapsed in HTML by replacing them + * with non-breaking space Unicode characters. + * @param {string} str The string in which to preserve whitespace. + * @return {string} A copy of {@code str} with preserved whitespace. + */ +goog.string.preserveSpaces = function(str) { + return str.replace(/(^|[\n ]) /g, '$1' + goog.string.Unicode.NBSP); +}; + + +/** + * Strip quote characters around a string. The second argument is a string of + * characters to treat as quotes. This can be a single character or a string of + * multiple character and in that case each of those are treated as possible + * quote characters. For example: + * + * 
+ * goog.string.stripQuotes('"abc"', '"`') --> 'abc'
+ * goog.string.stripQuotes('`abc`', '"`') --> 'abc'
+ *
+ * + * @param {string} str The string to strip. + * @param {string} quoteChars The quote characters to strip. + * @return {string} A copy of {@code str} without the quotes. + */ +goog.string.stripQuotes = function(str, quoteChars) { + var length = quoteChars.length; + for (var i = 0; i < length; i++) { + var quoteChar = length == 1 ? quoteChars : quoteChars.charAt(i); + if (str.charAt(0) == quoteChar && str.charAt(str.length - 1) == quoteChar) { + return str.substring(1, str.length - 1); + } + } + return str; +}; + + +/** + * Truncates a string to a certain length and adds '...' if necessary. The + * length also accounts for the ellipsis, so a maximum length of 10 and a string + * 'Hello World!' produces 'Hello W...'. + * @param {string} str The string to truncate. + * @param {number} chars Max number of characters. + * @param {boolean=} opt_protectEscapedCharacters Whether to protect escaped + * characters from being cut off in the middle. + * @return {string} The truncated {@code str} string. + */ +goog.string.truncate = function(str, chars, opt_protectEscapedCharacters) { + if (opt_protectEscapedCharacters) { + str = goog.string.unescapeEntities(str); + } + + if (str.length > chars) { + str = str.substring(0, chars - 3) + '...'; + } + + if (opt_protectEscapedCharacters) { + str = goog.string.htmlEscape(str); + } + + return str; +}; + + +/** + * Truncate a string in the middle, adding "..." if necessary, + * and favoring the beginning of the string. + * @param {string} str The string to truncate the middle of. + * @param {number} chars Max number of characters. + * @param {boolean=} opt_protectEscapedCharacters Whether to protect escaped + * characters from being cutoff in the middle. + * @param {number=} opt_trailingChars Optional number of trailing characters to + * leave at the end of the string, instead of truncating as close to the + * middle as possible. + * @return {string} A truncated copy of {@code str}. + */ +goog.string.truncateMiddle = function( + str, chars, opt_protectEscapedCharacters, opt_trailingChars) { + if (opt_protectEscapedCharacters) { + str = goog.string.unescapeEntities(str); + } + + if (opt_trailingChars && str.length > chars) { + if (opt_trailingChars > chars) { + opt_trailingChars = chars; + } + var endPoint = str.length - opt_trailingChars; + var startPoint = chars - opt_trailingChars; + str = str.substring(0, startPoint) + '...' + str.substring(endPoint); + } else if (str.length > chars) { + // Favor the beginning of the string: + var half = Math.floor(chars / 2); + var endPos = str.length - half; + half += chars % 2; + str = str.substring(0, half) + '...' + str.substring(endPos); + } + + if (opt_protectEscapedCharacters) { + str = goog.string.htmlEscape(str); + } + + return str; +}; + + +/** + * Special chars that need to be escaped for goog.string.quote. + * @private {!Object} + */ +goog.string.specialEscapeChars_ = { + '\0': '\\0', + '\b': '\\b', + '\f': '\\f', + '\n': '\\n', + '\r': '\\r', + '\t': '\\t', + '\x0B': '\\x0B', // '\v' is not supported in JScript + '"': '\\"', + '\\': '\\\\', + // To support the use case of embedding quoted strings inside of script + // tags, we have to make sure HTML comments and opening/closing script tags do + // not appear in the resulting string. The specific strings that must be + // escaped are documented at: + // http://www.w3.org/TR/html51/semantics.html#restrictions-for-contents-of-script-elements + '<': '\x3c' +}; + + +/** + * Character mappings used internally for goog.string.escapeChar. + * @private {!Object} + */ +goog.string.jsEscapeCache_ = { + '\'': '\\\'' +}; + + +/** + * Encloses a string in double quotes and escapes characters so that the + * string is a valid JS string. The resulting string is safe to embed in + * `