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The official WebDriver JavaScript bindings from the Selenium project
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<!DOCTYPE html><meta charset="UTF-8"><meta http-equiv="Content-Language" content="en" /><title>string.js</title><link href="../../../../dossier.css" rel="stylesheet" type="text/css"><div id="main-wrapper"><input type="checkbox" id="sidenav-toggle" /><main><header><h1>lib/goog/string/string.js</h1></header><pre><table class="srcfile"><tbody><tr><td><a name="l1" href="#l1">1</a><td>// Copyright 2006 The Closure Library Authors. All Rights Reserved.<tr><td><a name="l2" href="#l2">2</a><td>//<tr><td><a name="l3" href="#l3">3</a><td>// Licensed under the Apache License, Version 2.0 (the "License");<tr><td><a name="l4" href="#l4">4</a><td>// you may not use this file except in compliance with the License.<tr><td><a name="l5" href="#l5">5</a><td>// You may obtain a copy of the License at<tr><td><a name="l6" href="#l6">6</a><td>//<tr><td><a name="l7" href="#l7">7</a><td>// http://www.apache.org/licenses/LICENSE-2.0<tr><td><a name="l8" href="#l8">8</a><td>//<tr><td><a name="l9" href="#l9">9</a><td>// Unless required by applicable law or agreed to in writing, software<tr><td><a name="l10" href="#l10">10</a><td>// distributed under the License is distributed on an "AS-IS" BASIS,<tr><td><a name="l11" href="#l11">11</a><td>// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<tr><td><a name="l12" href="#l12">12</a><td>// See the License for the specific language governing permissions and<tr><td><a name="l13" href="#l13">13</a><td>// limitations under the License.<tr><td><a name="l14" href="#l14">14</a><td><tr><td><a name="l15" href="#l15">15</a><td>/**<tr><td><a name="l16" href="#l16">16</a><td> * @fileoverview Utilities for string manipulation.<tr><td><a name="l17" href="#l17">17</a><td> */<tr><td><a name="l18" href="#l18">18</a><td><tr><td><a name="l19" href="#l19">19</a><td><tr><td><a name="l20" href="#l20">20</a><td>/**<tr><td><a name="l21" href="#l21">21</a><td> * Namespace for string utilities<tr><td><a name="l22" href="#l22">22</a><td> */<tr><td><a name="l23" href="#l23">23</a><td>goog.provide('goog.string');<tr><td><a name="l24" href="#l24">24</a><td>goog.provide('goog.string.Unicode');<tr><td><a name="l25" href="#l25">25</a><td><tr><td><a name="l26" href="#l26">26</a><td><tr><td><a name="l27" href="#l27">27</a><td>/**<tr><td><a name="l28" href="#l28">28</a><td> * @define {boolean} Enables HTML escaping of lowercase letter "e" which helps<tr><td><a name="l29" href="#l29">29</a><td> * with detection of double-escaping as this letter is frequently used.<tr><td><a name="l30" href="#l30">30</a><td> */<tr><td><a name="l31" href="#l31">31</a><td>goog.define('goog.string.DETECT_DOUBLE_ESCAPING', false);<tr><td><a name="l32" href="#l32">32</a><td><tr><td><a name="l33" href="#l33">33</a><td><tr><td><a name="l34" href="#l34">34</a><td>/**<tr><td><a name="l35" href="#l35">35</a><td> * Common Unicode string characters.<tr><td><a name="l36" href="#l36">36</a><td> * @enum {string}<tr><td><a name="l37" href="#l37">37</a><td> */<tr><td><a name="l38" href="#l38">38</a><td>goog.string.Unicode = {<tr><td><a name="l39" href="#l39">39</a><td> NBSP: '\xa0'<tr><td><a name="l40" href="#l40">40</a><td>};<tr><td><a name="l41" href="#l41">41</a><td><tr><td><a name="l42" href="#l42">42</a><td><tr><td><a name="l43" href="#l43">43</a><td>/**<tr><td><a name="l44" href="#l44">44</a><td> * Fast prefix-checker.<tr><td><a name="l45" href="#l45">45</a><td> * @param {string} str The string to check.<tr><td><a name="l46" href="#l46">46</a><td> * @param {string} prefix A string to look for at the start of {@code str}.<tr><td><a name="l47" href="#l47">47</a><td> * @return {boolean} True if {@code str} begins with {@code prefix}.<tr><td><a name="l48" href="#l48">48</a><td> */<tr><td><a name="l49" href="#l49">49</a><td>goog.string.startsWith = function(str, prefix) {<tr><td><a name="l50" href="#l50">50</a><td> return str.lastIndexOf(prefix, 0) == 0;<tr><td><a name="l51" href="#l51">51</a><td>};<tr><td><a name="l52" href="#l52">52</a><td><tr><td><a name="l53" href="#l53">53</a><td><tr><td><a name="l54" href="#l54">54</a><td>/**<tr><td><a name="l55" href="#l55">55</a><td> * Fast suffix-checker.<tr><td><a name="l56" href="#l56">56</a><td> * @param {string} str The string to check.<tr><td><a name="l57" href="#l57">57</a><td> * @param {string} suffix A string to look for at the end of {@code str}.<tr><td><a name="l58" href="#l58">58</a><td> * @return {boolean} True if {@code str} ends with {@code suffix}.<tr><td><a name="l59" href="#l59">59</a><td> */<tr><td><a name="l60" href="#l60">60</a><td>goog.string.endsWith = function(str, suffix) {<tr><td><a name="l61" href="#l61">61</a><td> var l = str.length - suffix.length;<tr><td><a name="l62" href="#l62">62</a><td> return l >= 0 && str.indexOf(suffix, l) == l;<tr><td><a name="l63" href="#l63">63</a><td>};<tr><td><a name="l64" href="#l64">64</a><td><tr><td><a name="l65" href="#l65">65</a><td><tr><td><a name="l66" href="#l66">66</a><td>/**<tr><td><a name="l67" href="#l67">67</a><td> * Case-insensitive prefix-checker.<tr><td><a name="l68" href="#l68">68</a><td> * @param {string} str The string to check.<tr><td><a name="l69" href="#l69">69</a><td> * @param {string} prefix A string to look for at the end of {@code str}.<tr><td><a name="l70" href="#l70">70</a><td> * @return {boolean} True if {@code str} begins with {@code prefix} (ignoring<tr><td><a name="l71" href="#l71">71</a><td> * case).<tr><td><a name="l72" href="#l72">72</a><td> */<tr><td><a name="l73" href="#l73">73</a><td>goog.string.caseInsensitiveStartsWith = function(str, prefix) {<tr><td><a name="l74" href="#l74">74</a><td> return goog.string.caseInsensitiveCompare(<tr><td><a name="l75" href="#l75">75</a><td> prefix, str.substr(0, prefix.length)) == 0;<tr><td><a name="l76" href="#l76">76</a><td>};<tr><td><a name="l77" href="#l77">77</a><td><tr><td><a name="l78" href="#l78">78</a><td><tr><td><a name="l79" href="#l79">79</a><td>/**<tr><td><a name="l80" href="#l80">80</a><td> * Case-insensitive suffix-checker.<tr><td><a name="l81" href="#l81">81</a><td> * @param {string} str The string to check.<tr><td><a name="l82" href="#l82">82</a><td> * @param {string} suffix A string to look for at the end of {@code str}.<tr><td><a name="l83" href="#l83">83</a><td> * @return {boolean} True if {@code str} ends with {@code suffix} (ignoring<tr><td><a name="l84" href="#l84">84</a><td> * case).<tr><td><a name="l85" href="#l85">85</a><td> */<tr><td><a name="l86" href="#l86">86</a><td>goog.string.caseInsensitiveEndsWith = function(str, suffix) {<tr><td><a name="l87" href="#l87">87</a><td> return goog.string.caseInsensitiveCompare(<tr><td><a name="l88" href="#l88">88</a><td> suffix, str.substr(str.length - suffix.length, suffix.length)) == 0;<tr><td><a name="l89" href="#l89">89</a><td>};<tr><td><a name="l90" href="#l90">90</a><td><tr><td><a name="l91" href="#l91">91</a><td><tr><td><a name="l92" href="#l92">92</a><td>/**<tr><td><a name="l93" href="#l93">93</a><td> * Case-insensitive equality checker.<tr><td><a name="l94" href="#l94">94</a><td> * @param {string} str1 First string to check.<tr><td><a name="l95" href="#l95">95</a><td> * @param {string} str2 Second string to check.<tr><td><a name="l96" href="#l96">96</a><td> * @return {boolean} True if {@code str1} and {@code str2} are the same string,<tr><td><a name="l97" href="#l97">97</a><td> * ignoring case.<tr><td><a name="l98" href="#l98">98</a><td> */<tr><td><a name="l99" href="#l99">99</a><td>goog.string.caseInsensitiveEquals = function(str1, str2) {<tr><td><a name="l100" href="#l100">100</a><td> return str1.toLowerCase() == str2.toLowerCase();<tr><td><a name="l101" href="#l101">101</a><td>};<tr><td><a name="l102" href="#l102">102</a><td><tr><td><a name="l103" href="#l103">103</a><td><tr><td><a name="l104" href="#l104">104</a><td>/**<tr><td><a name="l105" href="#l105">105</a><td> * Does simple python-style string substitution.<tr><td><a name="l106" href="#l106">106</a><td> * subs("foo%s hot%s", "bar", "dog") becomes "foobar hotdog".<tr><td><a name="l107" href="#l107">107</a><td> * @param {string} str The string containing the pattern.<tr><td><a name="l108" href="#l108">108</a><td> * @param {...*} var_args The items to substitute into the pattern.<tr><td><a name="l109" href="#l109">109</a><td> * @return {string} A copy of {@code str} in which each occurrence of<tr><td><a name="l110" href="#l110">110</a><td> * {@code %s} has been replaced an argument from {@code var_args}.<tr><td><a name="l111" href="#l111">111</a><td> */<tr><td><a name="l112" href="#l112">112</a><td>goog.string.subs = function(str, var_args) {<tr><td><a name="l113" href="#l113">113</a><td> var splitParts = str.split('%s');<tr><td><a name="l114" href="#l114">114</a><td> var returnString = '';<tr><td><a name="l115" href="#l115">115</a><td><tr><td><a name="l116" href="#l116">116</a><td> var subsArguments = Array.prototype.slice.call(arguments, 1);<tr><td><a name="l117" href="#l117">117</a><td> while (subsArguments.length &&<tr><td><a name="l118" href="#l118">118</a><td> // Replace up to the last split part. We are inserting in the<tr><td><a name="l119" href="#l119">119</a><td> // positions between split parts.<tr><td><a name="l120" href="#l120">120</a><td> splitParts.length > 1) {<tr><td><a name="l121" href="#l121">121</a><td> returnString += splitParts.shift() + subsArguments.shift();<tr><td><a name="l122" href="#l122">122</a><td> }<tr><td><a name="l123" href="#l123">123</a><td><tr><td><a name="l124" href="#l124">124</a><td> return returnString + splitParts.join('%s'); // Join unused '%s'<tr><td><a name="l125" href="#l125">125</a><td>};<tr><td><a name="l126" href="#l126">126</a><td><tr><td><a name="l127" href="#l127">127</a><td><tr><td><a name="l128" href="#l128">128</a><td>/**<tr><td><a name="l129" href="#l129">129</a><td> * Converts multiple whitespace chars (spaces, non-breaking-spaces, new lines<tr><td><a name="l130" href="#l130">130</a><td> * and tabs) to a single space, and strips leading and trailing whitespace.<tr><td><a name="l131" href="#l131">131</a><td> * @param {string} str Input string.<tr><td><a name="l132" href="#l132">132</a><td> * @return {string} A copy of {@code str} with collapsed whitespace.<tr><td><a name="l133" href="#l133">133</a><td> */<tr><td><a name="l134" href="#l134">134</a><td>goog.string.collapseWhitespace = function(str) {<tr><td><a name="l135" href="#l135">135</a><td> // Since IE doesn't include non-breaking-space (0xa0) in their \s character<tr><td><a name="l136" href="#l136">136</a><td> // class (as required by section 7.2 of the ECMAScript spec), we explicitly<tr><td><a name="l137" href="#l137">137</a><td> // include it in the regexp to enforce consistent cross-browser behavior.<tr><td><a name="l138" href="#l138">138</a><td> return str.replace(/[\s\xa0]+/g, ' ').replace(/^\s+|\s+$/g, '');<tr><td><a name="l139" href="#l139">139</a><td>};<tr><td><a name="l140" href="#l140">140</a><td><tr><td><a name="l141" href="#l141">141</a><td><tr><td><a name="l142" href="#l142">142</a><td>/**<tr><td><a name="l143" href="#l143">143</a><td> * Checks if a string is empty or contains only whitespaces.<tr><td><a name="l144" href="#l144">144</a><td> * @param {string} str The string to check.<tr><td><a name="l145" href="#l145">145</a><td> * @return {boolean} True if {@code str} is empty or whitespace only.<tr><td><a name="l146" href="#l146">146</a><td> */<tr><td><a name="l147" href="#l147">147</a><td>goog.string.isEmpty = function(str) {<tr><td><a name="l148" href="#l148">148</a><td> // testing length == 0 first is actually slower in all browsers (about the<tr><td><a name="l149" href="#l149">149</a><td> // same in Opera).<tr><td><a name="l150" href="#l150">150</a><td> // Since IE doesn't include non-breaking-space (0xa0) in their \s character<tr><td><a name="l151" href="#l151">151</a><td> // class (as required by section 7.2 of the ECMAScript spec), we explicitly<tr><td><a name="l152" href="#l152">152</a><td> // include it in the regexp to enforce consistent cross-browser behavior.<tr><td><a name="l153" href="#l153">153</a><td> return /^[\s\xa0]*$/.test(str);<tr><td><a name="l154" href="#l154">154</a><td>};<tr><td><a name="l155" href="#l155">155</a><td><tr><td><a name="l156" href="#l156">156</a><td><tr><td><a name="l157" href="#l157">157</a><td>/**<tr><td><a name="l158" href="#l158">158</a><td> * Checks if a string is null, undefined, empty or contains only whitespaces.<tr><td><a name="l159" href="#l159">159</a><td> * @param {*} str The string to check.<tr><td><a name="l160" href="#l160">160</a><td> * @return {boolean} True if{@code str} is null, undefined, empty, or<tr><td><a name="l161" href="#l161">161</a><td> * whitespace only.<tr><td><a name="l162" href="#l162">162</a><td> */<tr><td><a name="l163" href="#l163">163</a><td>goog.string.isEmptySafe = function(str) {<tr><td><a name="l164" href="#l164">164</a><td> return goog.string.isEmpty(goog.string.makeSafe(str));<tr><td><a name="l165" href="#l165">165</a><td>};<tr><td><a name="l166" href="#l166">166</a><td><tr><td><a name="l167" href="#l167">167</a><td><tr><td><a name="l168" href="#l168">168</a><td>/**<tr><td><a name="l169" href="#l169">169</a><td> * Checks if a string is all breaking whitespace.<tr><td><a name="l170" href="#l170">170</a><td> * @param {string} str The string to check.<tr><td><a name="l171" href="#l171">171</a><td> * @return {boolean} Whether the string is all breaking whitespace.<tr><td><a name="l172" href="#l172">172</a><td> */<tr><td><a name="l173" href="#l173">173</a><td>goog.string.isBreakingWhitespace = function(str) {<tr><td><a name="l174" href="#l174">174</a><td> return !/[^\t\n\r ]/.test(str);<tr><td><a name="l175" href="#l175">175</a><td>};<tr><td><a name="l176" href="#l176">176</a><td><tr><td><a name="l177" href="#l177">177</a><td><tr><td><a name="l178" href="#l178">178</a><td>/**<tr><td><a name="l179" href="#l179">179</a><td> * Checks if a string contains all letters.<tr><td><a name="l180" href="#l180">180</a><td> * @param {string} str string to check.<tr><td><a name="l181" href="#l181">181</a><td> * @return {boolean} True if {@code str} consists entirely of letters.<tr><td><a name="l182" href="#l182">182</a><td> */<tr><td><a name="l183" href="#l183">183</a><td>goog.string.isAlpha = function(str) {<tr><td><a name="l184" href="#l184">184</a><td> return !/[^a-zA-Z]/.test(str);<tr><td><a name="l185" href="#l185">185</a><td>};<tr><td><a name="l186" href="#l186">186</a><td><tr><td><a name="l187" href="#l187">187</a><td><tr><td><a name="l188" href="#l188">188</a><td>/**<tr><td><a name="l189" href="#l189">189</a><td> * Checks if a string contains only numbers.<tr><td><a name="l190" href="#l190">190</a><td> * @param {*} str string to check. If not a string, it will be<tr><td><a name="l191" href="#l191">191</a><td> * casted to one.<tr><td><a name="l192" href="#l192">192</a><td> * @return {boolean} True if {@code str} is numeric.<tr><td><a name="l193" href="#l193">193</a><td> */<tr><td><a name="l194" href="#l194">194</a><td>goog.string.isNumeric = function(str) {<tr><td><a name="l195" href="#l195">195</a><td> return !/[^0-9]/.test(str);<tr><td><a name="l196" href="#l196">196</a><td>};<tr><td><a name="l197" href="#l197">197</a><td><tr><td><a name="l198" href="#l198">198</a><td><tr><td><a name="l199" href="#l199">199</a><td>/**<tr><td><a name="l200" href="#l200">200</a><td> * Checks if a string contains only numbers or letters.<tr><td><a name="l201" href="#l201">201</a><td> * @param {string} str string to check.<tr><td><a name="l202" href="#l202">202</a><td> * @return {boolean} True if {@code str} is alphanumeric.<tr><td><a name="l203" href="#l203">203</a><td> */<tr><td><a name="l204" href="#l204">204</a><td>goog.string.isAlphaNumeric = function(str) {<tr><td><a name="l205" href="#l205">205</a><td> return !/[^a-zA-Z0-9]/.test(str);<tr><td><a name="l206" href="#l206">206</a><td>};<tr><td><a name="l207" href="#l207">207</a><td><tr><td><a name="l208" href="#l208">208</a><td><tr><td><a name="l209" href="#l209">209</a><td>/**<tr><td><a name="l210" href="#l210">210</a><td> * Checks if a character is a space character.<tr><td><a name="l211" href="#l211">211</a><td> * @param {string} ch Character to check.<tr><td><a name="l212" href="#l212">212</a><td> * @return {boolean} True if {code ch} is a space.<tr><td><a name="l213" href="#l213">213</a><td> */<tr><td><a name="l214" href="#l214">214</a><td>goog.string.isSpace = function(ch) {<tr><td><a name="l215" href="#l215">215</a><td> return ch == ' ';<tr><td><a name="l216" href="#l216">216</a><td>};<tr><td><a name="l217" href="#l217">217</a><td><tr><td><a name="l218" href="#l218">218</a><td><tr><td><a name="l219" href="#l219">219</a><td>/**<tr><td><a name="l220" href="#l220">220</a><td> * Checks if a character is a valid unicode character.<tr><td><a name="l221" href="#l221">221</a><td> * @param {string} ch Character to check.<tr><td><a name="l222" href="#l222">222</a><td> * @return {boolean} True if {code ch} is a valid unicode character.<tr><td><a name="l223" href="#l223">223</a><td> */<tr><td><a name="l224" href="#l224">224</a><td>goog.string.isUnicodeChar = function(ch) {<tr><td><a name="l225" href="#l225">225</a><td> return ch.length == 1 && ch >= ' ' && ch <= '~' ||<tr><td><a name="l226" href="#l226">226</a><td> ch >= '\u0080' && ch <= '\uFFFD';<tr><td><a name="l227" href="#l227">227</a><td>};<tr><td><a name="l228" href="#l228">228</a><td><tr><td><a name="l229" href="#l229">229</a><td><tr><td><a name="l230" href="#l230">230</a><td>/**<tr><td><a name="l231" href="#l231">231</a><td> * Takes a string and replaces newlines with a space. Multiple lines are<tr><td><a name="l232" href="#l232">232</a><td> * replaced with a single space.<tr><td><a name="l233" href="#l233">233</a><td> * @param {string} str The string from which to strip newlines.<tr><td><a name="l234" href="#l234">234</a><td> * @return {string} A copy of {@code str} stripped of newlines.<tr><td><a name="l235" href="#l235">235</a><td> */<tr><td><a name="l236" href="#l236">236</a><td>goog.string.stripNewlines = function(str) {<tr><td><a name="l237" href="#l237">237</a><td> return str.replace(/(\r\n|\r|\n)+/g, ' ');<tr><td><a name="l238" href="#l238">238</a><td>};<tr><td><a name="l239" href="#l239">239</a><td><tr><td><a name="l240" href="#l240">240</a><td><tr><td><a name="l241" href="#l241">241</a><td>/**<tr><td><a name="l242" href="#l242">242</a><td> * Replaces Windows and Mac new lines with unix style: \r or \r\n with \n.<tr><td><a name="l243" href="#l243">243</a><td> * @param {string} str The string to in which to canonicalize newlines.<tr><td><a name="l244" href="#l244">244</a><td> * @return {string} {@code str} A copy of {@code} with canonicalized newlines.<tr><td><a name="l245" href="#l245">245</a><td> */<tr><td><a name="l246" href="#l246">246</a><td>goog.string.canonicalizeNewlines = function(str) {<tr><td><a name="l247" href="#l247">247</a><td> return str.replace(/(\r\n|\r|\n)/g, '\n');<tr><td><a name="l248" href="#l248">248</a><td>};<tr><td><a name="l249" href="#l249">249</a><td><tr><td><a name="l250" href="#l250">250</a><td><tr><td><a name="l251" href="#l251">251</a><td>/**<tr><td><a name="l252" href="#l252">252</a><td> * Normalizes whitespace in a string, replacing all whitespace chars with<tr><td><a name="l253" href="#l253">253</a><td> * a space.<tr><td><a name="l254" href="#l254">254</a><td> * @param {string} str The string in which to normalize whitespace.<tr><td><a name="l255" href="#l255">255</a><td> * @return {string} A copy of {@code str} with all whitespace normalized.<tr><td><a name="l256" href="#l256">256</a><td> */<tr><td><a name="l257" href="#l257">257</a><td>goog.string.normalizeWhitespace = function(str) {<tr><td><a name="l258" href="#l258">258</a><td> return str.replace(/\xa0|\s/g, ' ');<tr><td><a name="l259" href="#l259">259</a><td>};<tr><td><a name="l260" href="#l260">260</a><td><tr><td><a name="l261" href="#l261">261</a><td><tr><td><a name="l262" href="#l262">262</a><td>/**<tr><td><a name="l263" href="#l263">263</a><td> * Normalizes spaces in a string, replacing all consecutive spaces and tabs<tr><td><a name="l264" href="#l264">264</a><td> * with a single space. Replaces non-breaking space with a space.<tr><td><a name="l265" href="#l265">265</a><td> * @param {string} str The string in which to normalize spaces.<tr><td><a name="l266" href="#l266">266</a><td> * @return {string} A copy of {@code str} with all consecutive spaces and tabs<tr><td><a name="l267" href="#l267">267</a><td> * replaced with a single space.<tr><td><a name="l268" href="#l268">268</a><td> */<tr><td><a name="l269" href="#l269">269</a><td>goog.string.normalizeSpaces = function(str) {<tr><td><a name="l270" href="#l270">270</a><td> return str.replace(/\xa0|[ \t]+/g, ' ');<tr><td><a name="l271" href="#l271">271</a><td>};<tr><td><a name="l272" href="#l272">272</a><td><tr><td><a name="l273" href="#l273">273</a><td><tr><td><a name="l274" href="#l274">274</a><td>/**<tr><td><a name="l275" href="#l275">275</a><td> * Removes the breaking spaces from the left and right of the string and<tr><td><a name="l276" href="#l276">276</a><td> * collapses the sequences of breaking spaces in the middle into single spaces.<tr><td><a name="l277" href="#l277">277</a><td> * The original and the result strings render the same way in HTML.<tr><td><a name="l278" href="#l278">278</a><td> * @param {string} str A string in which to collapse spaces.<tr><td><a name="l279" href="#l279">279</a><td> * @return {string} Copy of the string with normalized breaking spaces.<tr><td><a name="l280" href="#l280">280</a><td> */<tr><td><a name="l281" href="#l281">281</a><td>goog.string.collapseBreakingSpaces = function(str) {<tr><td><a name="l282" href="#l282">282</a><td> return str.replace(/[\t\r\n ]+/g, ' ').replace(<tr><td><a name="l283" href="#l283">283</a><td> /^[\t\r\n ]+|[\t\r\n ]+$/g, '');<tr><td><a name="l284" href="#l284">284</a><td>};<tr><td><a name="l285" href="#l285">285</a><td><tr><td><a name="l286" href="#l286">286</a><td><tr><td><a name="l287" href="#l287">287</a><td>/**<tr><td><a name="l288" href="#l288">288</a><td> * Trims white spaces to the left and right of a string.<tr><td><a name="l289" href="#l289">289</a><td> * @param {string} str The string to trim.<tr><td><a name="l290" href="#l290">290</a><td> * @return {string} A trimmed copy of {@code str}.<tr><td><a name="l291" href="#l291">291</a><td> */<tr><td><a name="l292" href="#l292">292</a><td>goog.string.trim = function(str) {<tr><td><a name="l293" href="#l293">293</a><td> // Since IE doesn't include non-breaking-space (0xa0) in their \s character<tr><td><a name="l294" href="#l294">294</a><td> // class (as required by section 7.2 of the ECMAScript spec), we explicitly<tr><td><a name="l295" href="#l295">295</a><td> // include it in the regexp to enforce consistent cross-browser behavior.<tr><td><a name="l296" href="#l296">296</a><td> return str.replace(/^[\s\xa0]+|[\s\xa0]+$/g, '');<tr><td><a name="l297" href="#l297">297</a><td>};<tr><td><a name="l298" href="#l298">298</a><td><tr><td><a name="l299" href="#l299">299</a><td><tr><td><a name="l300" href="#l300">300</a><td>/**<tr><td><a name="l301" href="#l301">301</a><td> * Trims whitespaces at the left end of a string.<tr><td><a name="l302" href="#l302">302</a><td> * @param {string} str The string to left trim.<tr><td><a name="l303" href="#l303">303</a><td> * @return {string} A trimmed copy of {@code str}.<tr><td><a name="l304" href="#l304">304</a><td> */<tr><td><a name="l305" href="#l305">305</a><td>goog.string.trimLeft = function(str) {<tr><td><a name="l306" href="#l306">306</a><td> // Since IE doesn't include non-breaking-space (0xa0) in their \s character<tr><td><a name="l307" href="#l307">307</a><td> // class (as required by section 7.2 of the ECMAScript spec), we explicitly<tr><td><a name="l308" href="#l308">308</a><td> // include it in the regexp to enforce consistent cross-browser behavior.<tr><td><a name="l309" href="#l309">309</a><td> return str.replace(/^[\s\xa0]+/, '');<tr><td><a name="l310" href="#l310">310</a><td>};<tr><td><a name="l311" href="#l311">311</a><td><tr><td><a name="l312" href="#l312">312</a><td><tr><td><a name="l313" href="#l313">313</a><td>/**<tr><td><a name="l314" href="#l314">314</a><td> * Trims whitespaces at the right end of a string.<tr><td><a name="l315" href="#l315">315</a><td> * @param {string} str The string to right trim.<tr><td><a name="l316" href="#l316">316</a><td> * @return {string} A trimmed copy of {@code str}.<tr><td><a name="l317" href="#l317">317</a><td> */<tr><td><a name="l318" href="#l318">318</a><td>goog.string.trimRight = function(str) {<tr><td><a name="l319" href="#l319">319</a><td> // Since IE doesn't include non-breaking-space (0xa0) in their \s character<tr><td><a name="l320" href="#l320">320</a><td> // class (as required by section 7.2 of the ECMAScript spec), we explicitly<tr><td><a name="l321" href="#l321">321</a><td> // include it in the regexp to enforce consistent cross-browser behavior.<tr><td><a name="l322" href="#l322">322</a><td> return str.replace(/[\s\xa0]+$/, '');<tr><td><a name="l323" href="#l323">323</a><td>};<tr><td><a name="l324" href="#l324">324</a><td><tr><td><a name="l325" href="#l325">325</a><td><tr><td><a name="l326" href="#l326">326</a><td>/**<tr><td><a name="l327" href="#l327">327</a><td> * A string comparator that ignores case.<tr><td><a name="l328" href="#l328">328</a><td> * -1 = str1 less than str2<tr><td><a name="l329" href="#l329">329</a><td> * 0 = str1 equals str2<tr><td><a name="l330" href="#l330">330</a><td> * 1 = str1 greater than str2<tr><td><a name="l331" href="#l331">331</a><td> *<tr><td><a name="l332" href="#l332">332</a><td> * @param {string} str1 The string to compare.<tr><td><a name="l333" href="#l333">333</a><td> * @param {string} str2 The string to compare {@code str1} to.<tr><td><a name="l334" href="#l334">334</a><td> * @return {number} The comparator result, as described above.<tr><td><a name="l335" href="#l335">335</a><td> */<tr><td><a name="l336" href="#l336">336</a><td>goog.string.caseInsensitiveCompare = function(str1, str2) {<tr><td><a name="l337" href="#l337">337</a><td> var test1 = String(str1).toLowerCase();<tr><td><a name="l338" href="#l338">338</a><td> var test2 = String(str2).toLowerCase();<tr><td><a name="l339" href="#l339">339</a><td><tr><td><a name="l340" href="#l340">340</a><td> if (test1 < test2) {<tr><td><a name="l341" href="#l341">341</a><td> return -1;<tr><td><a name="l342" href="#l342">342</a><td> } else if (test1 == test2) {<tr><td><a name="l343" href="#l343">343</a><td> return 0;<tr><td><a name="l344" href="#l344">344</a><td> } else {<tr><td><a name="l345" href="#l345">345</a><td> return 1;<tr><td><a name="l346" href="#l346">346</a><td> }<tr><td><a name="l347" href="#l347">347</a><td>};<tr><td><a name="l348" href="#l348">348</a><td><tr><td><a name="l349" href="#l349">349</a><td><tr><td><a name="l350" href="#l350">350</a><td>/**<tr><td><a name="l351" href="#l351">351</a><td> * Regular expression used for splitting a string into substrings of fractional<tr><td><a name="l352" href="#l352">352</a><td> * numbers, integers, and non-numeric characters.<tr><td><a name="l353" href="#l353">353</a><td> * @type {RegExp}<tr><td><a name="l354" href="#l354">354</a><td> * @private<tr><td><a name="l355" href="#l355">355</a><td> */<tr><td><a name="l356" href="#l356">356</a><td>goog.string.numerateCompareRegExp_ = /(\.\d+)|(\d+)|(\D+)/g;<tr><td><a name="l357" href="#l357">357</a><td><tr><td><a name="l358" href="#l358">358</a><td><tr><td><a name="l359" href="#l359">359</a><td>/**<tr><td><a name="l360" href="#l360">360</a><td> * String comparison function that handles numbers in a way humans might expect.<tr><td><a name="l361" href="#l361">361</a><td> * Using this function, the string "File 2.jpg" sorts before "File 10.jpg". The<tr><td><a name="l362" href="#l362">362</a><td> * comparison is mostly case-insensitive, though strings that are identical<tr><td><a name="l363" href="#l363">363</a><td> * except for case are sorted with the upper-case strings before lower-case.<tr><td><a name="l364" href="#l364">364</a><td> *<tr><td><a name="l365" href="#l365">365</a><td> * This comparison function is significantly slower (about 500x) than either<tr><td><a name="l366" href="#l366">366</a><td> * the default or the case-insensitive compare. It should not be used in<tr><td><a name="l367" href="#l367">367</a><td> * time-critical code, but should be fast enough to sort several hundred short<tr><td><a name="l368" href="#l368">368</a><td> * strings (like filenames) with a reasonable delay.<tr><td><a name="l369" href="#l369">369</a><td> *<tr><td><a name="l370" href="#l370">370</a><td> * @param {string} str1 The string to compare in a numerically sensitive way.<tr><td><a name="l371" href="#l371">371</a><td> * @param {string} str2 The string to compare {@code str1} to.<tr><td><a name="l372" href="#l372">372</a><td> * @return {number} less than 0 if str1 < str2, 0 if str1 == str2, greater than<tr><td><a name="l373" href="#l373">373</a><td> * 0 if str1 > str2.<tr><td><a name="l374" href="#l374">374</a><td> */<tr><td><a name="l375" href="#l375">375</a><td>goog.string.numerateCompare = function(str1, str2) {<tr><td><a name="l376" href="#l376">376</a><td> if (str1 == str2) {<tr><td><a name="l377" href="#l377">377</a><td> return 0;<tr><td><a name="l378" href="#l378">378</a><td> }<tr><td><a name="l379" href="#l379">379</a><td> if (!str1) {<tr><td><a name="l380" href="#l380">380</a><td> return -1;<tr><td><a name="l381" href="#l381">381</a><td> }<tr><td><a name="l382" href="#l382">382</a><td> if (!str2) {<tr><td><a name="l383" href="#l383">383</a><td> return 1;<tr><td><a name="l384" href="#l384">384</a><td> }<tr><td><a name="l385" href="#l385">385</a><td><tr><td><a name="l386" href="#l386">386</a><td> // Using match to split the entire string ahead of time turns out to be faster<tr><td><a name="l387" href="#l387">387</a><td> // for most inputs than using RegExp.exec or iterating over each character.<tr><td><a name="l388" href="#l388">388</a><td> var tokens1 = str1.toLowerCase().match(goog.string.numerateCompareRegExp_);<tr><td><a name="l389" href="#l389">389</a><td> var tokens2 = str2.toLowerCase().match(goog.string.numerateCompareRegExp_);<tr><td><a name="l390" href="#l390">390</a><td><tr><td><a name="l391" href="#l391">391</a><td> var count = Math.min(tokens1.length, tokens2.length);<tr><td><a name="l392" href="#l392">392</a><td><tr><td><a name="l393" href="#l393">393</a><td> for (var i = 0; i < count; i++) {<tr><td><a name="l394" href="#l394">394</a><td> var a = tokens1[i];<tr><td><a name="l395" href="#l395">395</a><td> var b = tokens2[i];<tr><td><a name="l396" href="#l396">396</a><td><tr><td><a name="l397" href="#l397">397</a><td> // Compare pairs of tokens, returning if one token sorts before the other.<tr><td><a name="l398" href="#l398">398</a><td> if (a != b) {<tr><td><a name="l399" href="#l399">399</a><td><tr><td><a name="l400" href="#l400">400</a><td> // Only if both tokens are integers is a special comparison required.<tr><td><a name="l401" href="#l401">401</a><td> // Decimal numbers are sorted as strings (e.g., '.09' < '.1').<tr><td><a name="l402" href="#l402">402</a><td> var num1 = parseInt(a, 10);<tr><td><a name="l403" href="#l403">403</a><td> if (!isNaN(num1)) {<tr><td><a name="l404" href="#l404">404</a><td> var num2 = parseInt(b, 10);<tr><td><a name="l405" href="#l405">405</a><td> if (!isNaN(num2) && num1 - num2) {<tr><td><a name="l406" href="#l406">406</a><td> return num1 - num2;<tr><td><a name="l407" href="#l407">407</a><td> }<tr><td><a name="l408" href="#l408">408</a><td> }<tr><td><a name="l409" href="#l409">409</a><td> return a < b ? -1 : 1;<tr><td><a name="l410" href="#l410">410</a><td> }<tr><td><a name="l411" href="#l411">411</a><td> }<tr><td><a name="l412" href="#l412">412</a><td><tr><td><a name="l413" href="#l413">413</a><td> // If one string is a substring of the other, the shorter string sorts first.<tr><td><a name="l414" href="#l414">414</a><td> if (tokens1.length != tokens2.length) {<tr><td><a name="l415" href="#l415">415</a><td> return tokens1.length - tokens2.length;<tr><td><a name="l416" href="#l416">416</a><td> }<tr><td><a name="l417" href="#l417">417</a><td><tr><td><a name="l418" href="#l418">418</a><td> // The two strings must be equivalent except for case (perfect equality is<tr><td><a name="l419" href="#l419">419</a><td> // tested at the head of the function.) Revert to default ASCII-betical string<tr><td><a name="l420" href="#l420">420</a><td> // comparison to stablize the sort.<tr><td><a name="l421" href="#l421">421</a><td> return str1 < str2 ? -1 : 1;<tr><td><a name="l422" href="#l422">422</a><td>};<tr><td><a name="l423" href="#l423">423</a><td><tr><td><a name="l424" href="#l424">424</a><td><tr><td><a name="l425" href="#l425">425</a><td>/**<tr><td><a name="l426" href="#l426">426</a><td> * URL-encodes a string<tr><td><a name="l427" href="#l427">427</a><td> * @param {*} str The string to url-encode.<tr><td><a name="l428" href="#l428">428</a><td> * @return {string} An encoded copy of {@code str} that is safe for urls.<tr><td><a name="l429" href="#l429">429</a><td> * Note that '#', ':', and other characters used to delimit portions<tr><td><a name="l430" href="#l430">430</a><td> * of URLs *will* be encoded.<tr><td><a name="l431" href="#l431">431</a><td> */<tr><td><a name="l432" href="#l432">432</a><td>goog.string.urlEncode = function(str) {<tr><td><a name="l433" href="#l433">433</a><td> return encodeURIComponent(String(str));<tr><td><a name="l434" href="#l434">434</a><td>};<tr><td><a name="l435" href="#l435">435</a><td><tr><td><a name="l436" href="#l436">436</a><td><tr><td><a name="l437" href="#l437">437</a><td>/**<tr><td><a name="l438" href="#l438">438</a><td> * URL-decodes the string. We need to specially handle '+'s because<tr><td><a name="l439" href="#l439">439</a><td> * the javascript library doesn't convert them to spaces.<tr><td><a name="l440" href="#l440">440</a><td> * @param {string} str The string to url decode.<tr><td><a name="l441" href="#l441">441</a><td> * @return {string} The decoded {@code str}.<tr><td><a name="l442" href="#l442">442</a><td> */<tr><td><a name="l443" href="#l443">443</a><td>goog.string.urlDecode = function(str) {<tr><td><a name="l444" href="#l444">444</a><td> return decodeURIComponent(str.replace(/\+/g, ' '));<tr><td><a name="l445" href="#l445">445</a><td>};<tr><td><a name="l446" href="#l446">446</a><td><tr><td><a name="l447" href="#l447">447</a><td><tr><td><a name="l448" href="#l448">448</a><td>/**<tr><td><a name="l449" href="#l449">449</a><td> * Converts \n to <br>s or <br />s.<tr><td><a name="l450" href="#l450">450</a><td> * @param {string} str The string in which to convert newlines.<tr><td><a name="l451" href="#l451">451</a><td> * @param {boolean=} opt_xml Whether to use XML compatible tags.<tr><td><a name="l452" href="#l452">452</a><td> * @return {string} A copy of {@code str} with converted newlines.<tr><td><a name="l453" href="#l453">453</a><td> */<tr><td><a name="l454" href="#l454">454</a><td>goog.string.newLineToBr = function(str, opt_xml) {<tr><td><a name="l455" href="#l455">455</a><td> return str.replace(/(\r\n|\r|\n)/g, opt_xml ? '<br />' : '<br>');<tr><td><a name="l456" href="#l456">456</a><td>};<tr><td><a name="l457" href="#l457">457</a><td><tr><td><a name="l458" href="#l458">458</a><td><tr><td><a name="l459" href="#l459">459</a><td>/**<tr><td><a name="l460" href="#l460">460</a><td> * Escapes double quote '"' and single quote '\'' characters in addition to<tr><td><a name="l461" href="#l461">461</a><td> * '&', '<', and '>' so that a string can be included in an HTML tag attribute<tr><td><a name="l462" href="#l462">462</a><td> * value within double or single quotes.<tr><td><a name="l463" href="#l463">463</a><td> *<tr><td><a name="l464" href="#l464">464</a><td> * It should be noted that > doesn't need to be escaped for the HTML or XML to<tr><td><a name="l465" href="#l465">465</a><td> * be valid, but it has been decided to escape it for consistency with other<tr><td><a name="l466" href="#l466">466</a><td> * implementations.<tr><td><a name="l467" href="#l467">467</a><td> *<tr><td><a name="l468" href="#l468">468</a><td> * With goog.string.DETECT_DOUBLE_ESCAPING, this function escapes also the<tr><td><a name="l469" href="#l469">469</a><td> * lowercase letter "e".<tr><td><a name="l470" href="#l470">470</a><td> *<tr><td><a name="l471" href="#l471">471</a><td> * NOTE(user):<tr><td><a name="l472" href="#l472">472</a><td> * HtmlEscape is often called during the generation of large blocks of HTML.<tr><td><a name="l473" href="#l473">473</a><td> * Using statics for the regular expressions and strings is an optimization<tr><td><a name="l474" href="#l474">474</a><td> * that can more than half the amount of time IE spends in this function for<tr><td><a name="l475" href="#l475">475</a><td> * large apps, since strings and regexes both contribute to GC allocations.<tr><td><a name="l476" href="#l476">476</a><td> *<tr><td><a name="l477" href="#l477">477</a><td> * Testing for the presence of a character before escaping increases the number<tr><td><a name="l478" href="#l478">478</a><td> * of function calls, but actually provides a speed increase for the average<tr><td><a name="l479" href="#l479">479</a><td> * case -- since the average case often doesn't require the escaping of all 4<tr><td><a name="l480" href="#l480">480</a><td> * characters and indexOf() is much cheaper than replace().<tr><td><a name="l481" href="#l481">481</a><td> * The worst case does suffer slightly from the additional calls, therefore the<tr><td><a name="l482" href="#l482">482</a><td> * opt_isLikelyToContainHtmlChars option has been included for situations<tr><td><a name="l483" href="#l483">483</a><td> * where all 4 HTML entities are very likely to be present and need escaping.<tr><td><a name="l484" href="#l484">484</a><td> *<tr><td><a name="l485" href="#l485">485</a><td> * Some benchmarks (times tended to fluctuate +-0.05ms):<tr><td><a name="l486" href="#l486">486</a><td> * FireFox IE6<tr><td><a name="l487" href="#l487">487</a><td> * (no chars / average (mix of cases) / all 4 chars)<tr><td><a name="l488" href="#l488">488</a><td> * no checks 0.13 / 0.22 / 0.22 0.23 / 0.53 / 0.80<tr><td><a name="l489" href="#l489">489</a><td> * indexOf 0.08 / 0.17 / 0.26 0.22 / 0.54 / 0.84<tr><td><a name="l490" href="#l490">490</a><td> * indexOf + re test 0.07 / 0.17 / 0.28 0.19 / 0.50 / 0.85<tr><td><a name="l491" href="#l491">491</a><td> *<tr><td><a name="l492" href="#l492">492</a><td> * An additional advantage of checking if replace actually needs to be called<tr><td><a name="l493" href="#l493">493</a><td> * is a reduction in the number of object allocations, so as the size of the<tr><td><a name="l494" href="#l494">494</a><td> * application grows the difference between the various methods would increase.<tr><td><a name="l495" href="#l495">495</a><td> *<tr><td><a name="l496" href="#l496">496</a><td> * @param {string} str string to be escaped.<tr><td><a name="l497" href="#l497">497</a><td> * @param {boolean=} opt_isLikelyToContainHtmlChars Don't perform a check to see<tr><td><a name="l498" href="#l498">498</a><td> * if the character needs replacing - use this option if you expect each of<tr><td><a name="l499" href="#l499">499</a><td> * the characters to appear often. Leave false if you expect few html<tr><td><a name="l500" href="#l500">500</a><td> * characters to occur in your strings, such as if you are escaping HTML.<tr><td><a name="l501" href="#l501">501</a><td> * @return {string} An escaped copy of {@code str}.<tr><td><a name="l502" href="#l502">502</a><td> */<tr><td><a name="l503" href="#l503">503</a><td>goog.string.htmlEscape = function(str, opt_isLikelyToContainHtmlChars) {<tr><td><a name="l504" href="#l504">504</a><td><tr><td><a name="l505" href="#l505">505</a><td> if (opt_isLikelyToContainHtmlChars) {<tr><td><a name="l506" href="#l506">506</a><td> str = str.replace(goog.string.AMP_RE_, '&amp;')<tr><td><a name="l507" href="#l507">507</a><td> .replace(goog.string.LT_RE_, '&lt;')<tr><td><a name="l508" href="#l508">508</a><td> .replace(goog.string.GT_RE_, '&gt;')<tr><td><a name="l509" href="#l509">509</a><td> .replace(goog.string.QUOT_RE_, '&quot;')<tr><td><a name="l510" href="#l510">510</a><td> .replace(goog.string.SINGLE_QUOTE_RE_, '&#39;')<tr><td><a name="l511" href="#l511">511</a><td> .replace(goog.string.NULL_RE_, '&#0;');<tr><td><a name="l512" href="#l512">512</a><td> if (goog.string.DETECT_DOUBLE_ESCAPING) {<tr><td><a name="l513" href="#l513">513</a><td> str = str.replace(goog.string.E_RE_, '&#101;');<tr><td><a name="l514" href="#l514">514</a><td> }<tr><td><a name="l515" href="#l515">515</a><td> return str;<tr><td><a name="l516" href="#l516">516</a><td><tr><td><a name="l517" href="#l517">517</a><td> } else {<tr><td><a name="l518" href="#l518">518</a><td> // quick test helps in the case when there are no chars to replace, in<tr><td><a name="l519" href="#l519">519</a><td> // worst case this makes barely a difference to the time taken<tr><td><a name="l520" href="#l520">520</a><td> if (!goog.string.ALL_RE_.test(str)) return str;<tr><td><a name="l521" href="#l521">521</a><td><tr><td><a name="l522" href="#l522">522</a><td> // str.indexOf is faster than regex.test in this case<tr><td><a name="l523" href="#l523">523</a><td> if (str.indexOf('&') != -1) {<tr><td><a name="l524" href="#l524">524</a><td> str = str.replace(goog.string.AMP_RE_, '&amp;');<tr><td><a name="l525" href="#l525">525</a><td> }<tr><td><a name="l526" href="#l526">526</a><td> if (str.indexOf('<') != -1) {<tr><td><a name="l527" href="#l527">527</a><td> str = str.replace(goog.string.LT_RE_, '&lt;');<tr><td><a name="l528" href="#l528">528</a><td> }<tr><td><a name="l529" href="#l529">529</a><td> if (str.indexOf('>') != -1) {<tr><td><a name="l530" href="#l530">530</a><td> str = str.replace(goog.string.GT_RE_, '&gt;');<tr><td><a name="l531" href="#l531">531</a><td> }<tr><td><a name="l532" href="#l532">532</a><td> if (str.indexOf('"') != -1) {<tr><td><a name="l533" href="#l533">533</a><td> str = str.replace(goog.string.QUOT_RE_, '&quot;');<tr><td><a name="l534" href="#l534">534</a><td> }<tr><td><a name="l535" href="#l535">535</a><td> if (str.indexOf('\'') != -1) {<tr><td><a name="l536" href="#l536">536</a><td> str = str.replace(goog.string.SINGLE_QUOTE_RE_, '&#39;');<tr><td><a name="l537" href="#l537">537</a><td> }<tr><td><a name="l538" href="#l538">538</a><td> if (str.indexOf('\x00') != -1) {<tr><td><a name="l539" href="#l539">539</a><td> str = str.replace(goog.string.NULL_RE_, '&#0;');<tr><td><a name="l540" href="#l540">540</a><td> }<tr><td><a name="l541" href="#l541">541</a><td> if (goog.string.DETECT_DOUBLE_ESCAPING && str.indexOf('e') != -1) {<tr><td><a name="l542" href="#l542">542</a><td> str = str.replace(goog.string.E_RE_, '&#101;');<tr><td><a name="l543" href="#l543">543</a><td> }<tr><td><a name="l544" href="#l544">544</a><td> return str;<tr><td><a name="l545" href="#l545">545</a><td> }<tr><td><a name="l546" href="#l546">546</a><td>};<tr><td><a name="l547" href="#l547">547</a><td><tr><td><a name="l548" href="#l548">548</a><td><tr><td><a name="l549" href="#l549">549</a><td>/**<tr><td><a name="l550" href="#l550">550</a><td> * Regular expression that matches an ampersand, for use in escaping.<tr><td><a name="l551" href="#l551">551</a><td> * @const {!RegExp}<tr><td><a name="l552" href="#l552">552</a><td> * @private<tr><td><a name="l553" href="#l553">553</a><td> */<tr><td><a name="l554" href="#l554">554</a><td>goog.string.AMP_RE_ = /&/g;<tr><td><a name="l555" href="#l555">555</a><td><tr><td><a name="l556" href="#l556">556</a><td><tr><td><a name="l557" href="#l557">557</a><td>/**<tr><td><a name="l558" href="#l558">558</a><td> * Regular expression that matches a less than sign, for use in escaping.<tr><td><a name="l559" href="#l559">559</a><td> * @const {!RegExp}<tr><td><a name="l560" href="#l560">560</a><td> * @private<tr><td><a name="l561" href="#l561">561</a><td> */<tr><td><a name="l562" href="#l562">562</a><td>goog.string.LT_RE_ = /</g;<tr><td><a name="l563" href="#l563">563</a><td><tr><td><a name="l564" href="#l564">564</a><td><tr><td><a name="l565" href="#l565">565</a><td>/**<tr><td><a name="l566" href="#l566">566</a><td> * Regular expression that matches a greater than sign, for use in escaping.<tr><td><a name="l567" href="#l567">567</a><td> * @const {!RegExp}<tr><td><a name="l568" href="#l568">568</a><td> * @private<tr><td><a name="l569" href="#l569">569</a><td> */<tr><td><a name="l570" href="#l570">570</a><td>goog.string.GT_RE_ = />/g;<tr><td><a name="l571" href="#l571">571</a><td><tr><td><a name="l572" href="#l572">572</a><td><tr><td><a name="l573" href="#l573">573</a><td>/**<tr><td><a name="l574" href="#l574">574</a><td> * Regular expression that matches a double quote, for use in escaping.<tr><td><a name="l575" href="#l575">575</a><td> * @const {!RegExp}<tr><td><a name="l576" href="#l576">576</a><td> * @private<tr><td><a name="l577" href="#l577">577</a><td> */<tr><td><a name="l578" href="#l578">578</a><td>goog.string.QUOT_RE_ = /"/g;<tr><td><a name="l579" href="#l579">579</a><td><tr><td><a name="l580" href="#l580">580</a><td><tr><td><a name="l581" href="#l581">581</a><td>/**<tr><td><a name="l582" href="#l582">582</a><td> * Regular expression that matches a single quote, for use in escaping.<tr><td><a name="l583" href="#l583">583</a><td> * @const {!RegExp}<tr><td><a name="l584" href="#l584">584</a><td> * @private<tr><td><a name="l585" href="#l585">585</a><td> */<tr><td><a name="l586" href="#l586">586</a><td>goog.string.SINGLE_QUOTE_RE_ = /'/g;<tr><td><a name="l587" href="#l587">587</a><td><tr><td><a name="l588" href="#l588">588</a><td><tr><td><a name="l589" href="#l589">589</a><td>/**<tr><td><a name="l590" href="#l590">590</a><td> * Regular expression that matches null character, for use in escaping.<tr><td><a name="l591" href="#l591">591</a><td> * @const {!RegExp}<tr><td><a name="l592" href="#l592">592</a><td> * @private<tr><td><a name="l593" href="#l593">593</a><td> */<tr><td><a name="l594" href="#l594">594</a><td>goog.string.NULL_RE_ = /\x00/g;<tr><td><a name="l595" href="#l595">595</a><td><tr><td><a name="l596" href="#l596">596</a><td><tr><td><a name="l597" href="#l597">597</a><td>/**<tr><td><a name="l598" href="#l598">598</a><td> * Regular expression that matches a lowercase letter "e", for use in escaping.<tr><td><a name="l599" href="#l599">599</a><td> * @const {!RegExp}<tr><td><a name="l600" href="#l600">600</a><td> * @private<tr><td><a name="l601" href="#l601">601</a><td> */<tr><td><a name="l602" href="#l602">602</a><td>goog.string.E_RE_ = /e/g;<tr><td><a name="l603" href="#l603">603</a><td><tr><td><a name="l604" href="#l604">604</a><td><tr><td><a name="l605" href="#l605">605</a><td>/**<tr><td><a name="l606" href="#l606">606</a><td> * Regular expression that matches any character that needs to be escaped.<tr><td><a name="l607" href="#l607">607</a><td> * @const {!RegExp}<tr><td><a name="l608" href="#l608">608</a><td> * @private<tr><td><a name="l609" href="#l609">609</a><td> */<tr><td><a name="l610" href="#l610">610</a><td>goog.string.ALL_RE_ = (goog.string.DETECT_DOUBLE_ESCAPING ?<tr><td><a name="l611" href="#l611">611</a><td> /[\x00&<>"'e]/ :<tr><td><a name="l612" href="#l612">612</a><td> /[\x00&<>"']/);<tr><td><a name="l613" href="#l613">613</a><td><tr><td><a name="l614" href="#l614">614</a><td><tr><td><a name="l615" href="#l615">615</a><td>/**<tr><td><a name="l616" href="#l616">616</a><td> * Unescapes an HTML string.<tr><td><a name="l617" href="#l617">617</a><td> *<tr><td><a name="l618" href="#l618">618</a><td> * @param {string} str The string to unescape.<tr><td><a name="l619" href="#l619">619</a><td> * @return {string} An unescaped copy of {@code str}.<tr><td><a name="l620" href="#l620">620</a><td> */<tr><td><a name="l621" href="#l621">621</a><td>goog.string.unescapeEntities = function(str) {<tr><td><a name="l622" href="#l622">622</a><td> if (goog.string.contains(str, '&')) {<tr><td><a name="l623" href="#l623">623</a><td> // We are careful not to use a DOM if we do not have one. We use the []<tr><td><a name="l624" href="#l624">624</a><td> // notation so that the JSCompiler will not complain about these objects and<tr><td><a name="l625" href="#l625">625</a><td> // fields in the case where we have no DOM.<tr><td><a name="l626" href="#l626">626</a><td> if ('document' in goog.global) {<tr><td><a name="l627" href="#l627">627</a><td> return goog.string.unescapeEntitiesUsingDom_(str);