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<h3>json <span class="subtitle">3.0.0</span></h3>
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<div class="highlight" ><pre><span class="c">/**</span>
<span class="c"> * <p>The JSON module adds support for serializing JavaScript objects into</span>
<span class="c"> * JSON strings and parsing JavaScript objects from strings in JSON format.</p></span>
<span class="c"> *</span>
<span class="c"> * <p>The JSON namespace is added to your YUI instance including static methods</span>
<span class="c"> * Y.JSON.parse(..) and Y.JSON.stringify(..).</p></span>
<span class="c"> *</span>
<span class="c"> * <p>The functionality and method signatures follow the ECMAScript 5</span>
<span class="c"> * specification. In browsers with native JSON support, the native</span>
<span class="c"> * implementation is used.</p></span>
<span class="c"> *</span>
<span class="c"> * <p>The <code>json</code> module is a rollup of <code>json-parse</code> and</span>
<span class="c"> * <code>json-stringify</code>.</p></span>
<span class="c"> * </span>
<span class="c"> * <p>As their names suggest, <code>json-parse</code> adds support for parsing</span>
<span class="c"> * JSON data (Y.JSON.parse) and <code>json-stringify</code> for serializing</span>
<span class="c"> * JavaScript data into JSON strings (Y.JSON.stringify). You may choose to</span>
<span class="c"> * include either of the submodules individually if you don't need the</span>
<span class="c"> * complementary functionality, or include the rollup for both.</p></span>
<span class="c"> *</span>
<span class="c"> * @module json</span>
<span class="c"> * @class JSON</span>
<span class="c"> * @static</span>
<span class="c"> */</span>
<span class="c">/**</span>
<span class="c"> * Provides Y.JSON.parse method to accept JSON strings and return native</span>
<span class="c"> * JavaScript objects.</span>
<span class="c"> *</span>
<span class="c"> * @module json</span>
<span class="c"> * @submodule json-parse</span>
<span class="c"> * @for JSON</span>
<span class="c"> * @static</span>
<span class="c"> */</span>
<span class="c">// All internals kept private for security reasons</span>
<span class="c"></span>
<span class="c">/**</span>
<span class="c"> * Alias to native browser implementation of the JSON object if available.</span>
<span class="c"> *</span>
<span class="c"> * @property Native</span>
<span class="c"> * @type {Object}</span>
<span class="c"> * @private</span>
<span class="c"> */</span>
<span class="k">var</span> <span class="nx">_JSON</span> <span class="o">=</span> <span class="nx">Y</span><span class="o">.</span><span class="nx">config</span><span class="o">.</span><span class="nx">win</span><span class="o">.</span><span class="nx">JSON</span><span class="o">,</span>
<span class="nx">Native</span> <span class="o">=</span> <span class="o">(</span><span class="nb">Object</span><span class="o">.</span><span class="nx">prototype</span><span class="o">.</span><span class="nx">toString</span><span class="o">.</span><span class="nx">call</span><span class="o">(</span><span class="nx">_JSON</span><span class="o">)</span> <span class="o">===</span> <span class="s1">'[object JSON]'</span> <span class="o">&&</span> <span class="nx">_JSON</span><span class="o">),</span>
<span class="c">/**</span>
<span class="c"> * Replace certain Unicode characters that JavaScript may handle incorrectly</span>
<span class="c"> * during eval--either by deleting them or treating them as line</span>
<span class="c"> * endings--with escape sequences.</span>
<span class="c"> * IMPORTANT NOTE: This regex will be used to modify the input if a match is</span>
<span class="c"> * found.</span>
<span class="c"> *</span>
<span class="c"> * @property _UNICODE_EXCEPTIONS</span>
<span class="c"> * @type {RegExp}</span>
<span class="c"> * @private</span>
<span class="c"> */</span>
<span class="nx">_UNICODE_EXCEPTIONS</span> <span class="o">=</span> <span class="sr">/[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g</span><span class="o">,</span>
<span class="c">/**</span>
<span class="c"> * First step in the safety evaluation. Regex used to replace all escape</span>
<span class="c"> * sequences (i.e. "\\", etc) with '@' characters (a non-JSON character).</span>
<span class="c"> *</span>
<span class="c"> * @property _ESCAPES</span>
<span class="c"> * @type {RegExp}</span>
<span class="c"> * @private</span>
<span class="c"> */</span>
<span class="nx">_ESCAPES</span> <span class="o">=</span> <span class="sr">/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g</span><span class="o">,</span>
<span class="c">/**</span>
<span class="c"> * Second step in the safety evaluation. Regex used to replace all simple</span>
<span class="c"> * values with ']' characters.</span>
<span class="c"> *</span>
<span class="c"> * @property _VALUES</span>
<span class="c"> * @type {RegExp}</span>
<span class="c"> * @private</span>
<span class="c"> */</span>
<span class="nx">_VALUES</span> <span class="o">=</span> <span class="sr">/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g</span><span class="o">,</span>
<span class="c">/**</span>
<span class="c"> * Third step in the safety evaluation. Regex used to remove all open</span>
<span class="c"> * square brackets following a colon, comma, or at the beginning of the</span>
<span class="c"> * string.</span>
<span class="c"> *</span>
<span class="c"> * @property _BRACKETS</span>
<span class="c"> * @type {RegExp}</span>
<span class="c"> * @private</span>
<span class="c"> */</span>
<span class="nx">_BRACKETS</span> <span class="o">=</span> <span class="sr">/(?:^|:|,)(?:\s*\[)+/g</span><span class="o">,</span>
<span class="c">/**</span>
<span class="c"> * Final step in the safety evaluation. Regex used to test the string left</span>
<span class="c"> * after all previous replacements for invalid characters.</span>
<span class="c"> *</span>
<span class="c"> * @property _UNSAFE</span>
<span class="c"> * @type {RegExp}</span>
<span class="c"> * @private</span>
<span class="c"> */</span>
<span class="nx">_UNSAFE</span> <span class="o">=</span> <span class="sr">/[^\],:{}\s]/</span><span class="o">,</span>
<span class="c">/**</span>
<span class="c"> * Replaces specific unicode characters with their appropriate \unnnn</span>
<span class="c"> * format. Some browsers ignore certain characters during eval.</span>
<span class="c"> *</span>
<span class="c"> * @method escapeException</span>
<span class="c"> * @param c {String} Unicode character</span>
<span class="c"> * @return {String} the \unnnn escapement of the character</span>
<span class="c"> * @private</span>
<span class="c"> */</span>
<span class="nx">_escapeException</span> <span class="o">=</span> <span class="k">function</span> <span class="o">(</span><span class="nx">c</span><span class="o">)</span> <span class="o">{</span>
<span class="k">return</span> <span class="s1">'\\u'</span><span class="o">+(</span><span class="s1">'0000'</span><span class="o">+(+(</span><span class="nx">c</span><span class="o">.</span><span class="nx">charCodeAt</span><span class="o">(</span><span class="m">0</span><span class="o">))).</span><span class="nx">toString</span><span class="o">(</span><span class="m">16</span><span class="o">)).</span><span class="nx">slice</span><span class="o">(-</span><span class="m">4</span><span class="o">);</span>
<span class="o">},</span>
<span class="c">/**</span>
<span class="c"> * Traverses nested objects, applying a reviver function to each (key,value)</span>
<span class="c"> * from the scope if the key:value's containing object. The value returned</span>
<span class="c"> * from the function will replace the original value in the key:value pair.</span>
<span class="c"> * If the value returned is undefined, the key will be omitted from the</span>
<span class="c"> * returned object.</span>
<span class="c"> *</span>
<span class="c"> * @method _revive</span>
<span class="c"> * @param data {MIXED} Any JavaScript data</span>
<span class="c"> * @param reviver {Function} filter or mutation function</span>
<span class="c"> * @return {MIXED} The results of the filtered data</span>
<span class="c"> * @private</span>
<span class="c"> */</span>
<span class="nx">_revive</span> <span class="o">=</span> <span class="k">function</span> <span class="o">(</span><span class="nx">data</span><span class="o">,</span> <span class="nx">reviver</span><span class="o">)</span> <span class="o">{</span>
<span class="k">var</span> <span class="nx">walk</span> <span class="o">=</span> <span class="k">function</span> <span class="o">(</span><span class="nx">o</span><span class="o">,</span><span class="nx">key</span><span class="o">)</span> <span class="o">{</span>
<span class="k">var</span> <span class="nx">k</span><span class="o">,</span><span class="nx">v</span><span class="o">,</span><span class="nx">value</span> <span class="o">=</span> <span class="nx">o</span><span class="o">[</span><span class="nx">key</span><span class="o">];</span>
<span class="k">if</span> <span class="o">(</span><span class="nx">value</span> <span class="o">&&</span> <span class="k">typeof</span> <span class="nx">value</span> <span class="o">===</span> <span class="s1">'object'</span><span class="o">)</span> <span class="o">{</span>
<span class="k">for</span> <span class="o">(</span><span class="nx">k</span> <span class="k">in</span> <span class="nx">value</span><span class="o">)</span> <span class="o">{</span>
<span class="k">if</span> <span class="o">(</span><span class="nx">value</span><span class="o">.</span><span class="nx">hasOwnProperty</span><span class="o">(</span><span class="nx">k</span><span class="o">))</span> <span class="o">{</span>
<span class="nx">v</span> <span class="o">=</span> <span class="nx">walk</span><span class="o">(</span><span class="nx">value</span><span class="o">,</span> <span class="nx">k</span><span class="o">);</span>
<span class="k">if</span> <span class="o">(</span><span class="nx">v</span> <span class="o">===</span> <span class="kc">undefined</span><span class="o">)</span> <span class="o">{</span>
<span class="nx">delete</span> <span class="nx">value</span><span class="o">[</span><span class="nx">k</span><span class="o">];</span>
<span class="o">}</span> <span class="k">else</span> <span class="o">{</span>
<span class="nx">value</span><span class="o">[</span><span class="nx">k</span><span class="o">]</span> <span class="o">=</span> <span class="nx">v</span><span class="o">;</span>
<span class="o">}</span>
<span class="o">}</span>
<span class="o">}</span>
<span class="o">}</span>
<span class="k">return</span> <span class="nx">reviver</span><span class="o">.</span><span class="nx">call</span><span class="o">(</span><span class="nx">o</span><span class="o">,</span><span class="nx">key</span><span class="o">,</span><span class="nx">value</span><span class="o">);</span>
<span class="o">};</span>
<span class="k">return</span> <span class="k">typeof</span> <span class="nx">reviver</span> <span class="o">===</span> <span class="s1">'function'</span> <span class="o">?</span> <span class="nx">walk</span><span class="o">({</span><span class="s1">''</span><span class="o">:</span><span class="nx">data</span><span class="o">},</span><span class="s1">''</span><span class="o">)</span> <span class="o">:</span> <span class="nx">data</span><span class="o">;</span>
<span class="o">},</span>
<span class="c">/**</span>
<span class="c"> * Parse a JSON string, returning the native JavaScript representation.</span>
<span class="c"> *</span>
<span class="c"> * @param s {string} JSON string data</span>
<span class="c"> * @param reviver {function} (optional) function(k,v) passed each key value</span>
<span class="c"> * pair of object literals, allowing pruning or altering values</span>
<span class="c"> * @return {MIXED} the native JavaScript representation of the JSON string</span>
<span class="c"> * @throws SyntaxError</span>
<span class="c"> * @method parse</span>
<span class="c"> * @static</span>
<span class="c"> */</span>
<span class="c">// JavaScript implementation in lieu of native browser support. Based on</span>
<span class="c"></span> <span class="c">// the json2.js library from http://json.org</span>
<span class="c"></span> <span class="nx">_parse</span> <span class="o">=</span> <span class="k">function</span> <span class="o">(</span><span class="nx">s</span><span class="o">,</span><span class="nx">reviver</span><span class="o">)</span> <span class="o">{</span>
<span class="k">if</span> <span class="o">(</span><span class="k">typeof</span> <span class="nx">s</span> <span class="o">===</span> <span class="s1">'string'</span><span class="o">)</span> <span class="o">{</span>
<span class="c">// Replace certain Unicode characters that are otherwise handled</span>
<span class="c"></span> <span class="c">// incorrectly by some browser implementations.</span>
<span class="c"></span> <span class="c">// NOTE: This modifies the input if such characters are found!</span>
<span class="c"></span> <span class="nx">s</span> <span class="o">=</span> <span class="nx">s</span><span class="o">.</span><span class="nx">replace</span><span class="o">(</span><span class="nx">_UNICODE_EXCEPTIONS</span><span class="o">,</span> <span class="nx">_escapeException</span><span class="o">);</span>
<span class="c">// Test for any remaining invalid characters</span>
<span class="c"></span> <span class="k">if</span> <span class="o">(!</span><span class="nx">_UNSAFE</span><span class="o">.</span><span class="nx">test</span><span class="o">(</span><span class="nx">s</span><span class="o">.</span><span class="nx">replace</span><span class="o">(</span><span class="nx">_ESCAPES</span><span class="o">,</span><span class="s1">'@'</span><span class="o">).</span>
<span class="nx">replace</span><span class="o">(</span><span class="nx">_VALUES</span><span class="o">,</span><span class="s1">']'</span><span class="o">).</span>
<span class="nx">replace</span><span class="o">(</span><span class="nx">_BRACKETS</span><span class="o">,</span><span class="s1">''</span><span class="o">)))</span> <span class="o">{</span>
<span class="c">// Eval the text into a JavaScript data structure, apply any</span>
<span class="c"></span> <span class="c">// reviver function, and return</span>
<span class="c"></span> <span class="k">return</span> <span class="nx">_revive</span><span class="o">(</span> <span class="nb">eval</span><span class="o">(</span><span class="s1">'('</span> <span class="o">+</span> <span class="nx">s</span> <span class="o">+</span> <span class="s1">')'</span><span class="o">),</span> <span class="nx">reviver</span> <span class="o">);</span>
<span class="o">}</span>
<span class="o">}</span>
<span class="k">throw</span> <span class="k">new</span> <span class="nx">SyntaxError</span><span class="o">(</span><span class="s1">'JSON.parse'</span><span class="o">);</span>
<span class="o">};</span>
<span class="nx">Y</span><span class="o">.</span><span class="nx">namespace</span><span class="o">(</span><span class="s1">'JSON'</span><span class="o">).</span><span class="nx">parse</span> <span class="o">=</span> <span class="k">function</span> <span class="o">(</span><span class="nx">s</span><span class="o">,</span><span class="nx">reviver</span><span class="o">)</span> <span class="o">{</span>
<span class="k">return</span> <span class="nx">Native</span> <span class="o">&&</span> <span class="nx">Y</span><span class="o">.</span><span class="nx">JSON</span><span class="o">.</span><span class="nx">useNativeParse</span> <span class="o">?</span>
<span class="nx">Native</span><span class="o">.</span><span class="nx">parse</span><span class="o">(</span><span class="nx">s</span><span class="o">,</span><span class="nx">reviver</span><span class="o">)</span> <span class="o">:</span> <span class="nx">_parse</span><span class="o">(</span><span class="nx">s</span><span class="o">,</span><span class="nx">reviver</span><span class="o">);</span>
<span class="o">};</span>
<span class="c">/**</span>
<span class="c"> * Leverage native JSON parse if the browser has a native implementation.</span>
<span class="c"> * In general, this is a good idea. See the Known Issues section in the</span>
<span class="c"> * JSON user guide for caveats. The default value is true for browsers with</span>
<span class="c"> * native JSON support.</span>
<span class="c"> *</span>
<span class="c"> * @property useNativeParse</span>
<span class="c"> * @type Boolean</span>
<span class="c"> * @default true</span>
<span class="c"> * @static</span>
<span class="c"> */</span>
<span class="nx">Y</span><span class="o">.</span><span class="nx">JSON</span><span class="o">.</span><span class="nx">useNativeParse</span> <span class="o">=</span> <span class="o">!!</span><span class="nx">Native</span><span class="o">;</span>
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