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<h3>json&nbsp; <span class="subtitle">3.00PR1</span></h3>
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<div class="highlight" ><pre><span class="c">/**</span>
<span class="c"> * Provides Y.JSON.stringify method for converting objects to JSON strings.</span>
<span class="c"> * @module json</span>
<span class="c"> * @class JSON</span>
<span class="c"> * @static</span>
<span class="c"> */</span>
<span class="k">var</span> <span class="nx">isA</span> <span class="o">=</span> <span class="nx">Y</span><span class="o">.</span><span class="nx">Lang</span><span class="o">.</span><span class="nx">isArray</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">Y</span><span class="o">.</span><span class="nx">JSON</span> <span class="o">||</span> <span class="o">{};</span>
<span class="nx">Y</span><span class="o">.</span><span class="nx">mix</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="c">/**</span>
<span class="c"> * Regex used to replace special characters in strings for JSON</span>
<span class="c"> * stringification.</span>
<span class="c"> * @property _SPECIAL_CHARS</span>
<span class="c"> * @type {RegExp}</span>
<span class="c"> * @static</span>
<span class="c"> * @private</span>
<span class="c"> */</span>
<span class="nx">_SPECIAL_CHARS</span> <span class="o">:</span> <span class="sr">/[&quot;\\\x00-\x1f\x7f-\x9f]/g</span><span class="o">,</span>
<span class="c">/**</span>
<span class="c"> * Character substitution map for common escapes and special characters.</span>
<span class="c"> * @property _CHARS</span>
<span class="c"> * @type {Object}</span>
<span class="c"> * @static</span>
<span class="c"> * @private</span>
<span class="c"> */</span>
<span class="nx">_CHARS</span> <span class="o">:</span> <span class="o">{</span>
<span class="s1">&#39;\b&#39;</span><span class="o">:</span> <span class="s1">&#39;\\b&#39;</span><span class="o">,</span>
<span class="s1">&#39;\t&#39;</span><span class="o">:</span> <span class="s1">&#39;\\t&#39;</span><span class="o">,</span>
<span class="s1">&#39;\n&#39;</span><span class="o">:</span> <span class="s1">&#39;\\n&#39;</span><span class="o">,</span>
<span class="s1">&#39;\f&#39;</span><span class="o">:</span> <span class="s1">&#39;\\f&#39;</span><span class="o">,</span>
<span class="s1">&#39;\r&#39;</span><span class="o">:</span> <span class="s1">&#39;\\r&#39;</span><span class="o">,</span>
<span class="s1">&#39;&quot;&#39;</span> <span class="o">:</span> <span class="s1">&#39;\\&quot;&#39;</span><span class="o">,</span>
<span class="s1">&#39;\\&#39;</span><span class="o">:</span> <span class="s1">&#39;\\\\&#39;</span>
<span class="o">},</span>
<span class="c">/**</span>
<span class="c"> * Serializes a Date instance as a UTC date string. Used internally by</span>
<span class="c"> * stringify. Override this method if you need Dates serialized in a</span>
<span class="c"> * different format.</span>
<span class="c"> * @method dateToString</span>
<span class="c"> * @param d {Date} The Date to serialize</span>
<span class="c"> * @return {String} stringified Date in UTC format YYYY-MM-DDTHH:mm:SSZ</span>
<span class="c"> * @static</span>
<span class="c"> */</span>
<span class="nx">dateToString</span> <span class="o">:</span> <span class="k">function</span> <span class="o">(</span><span class="nx">d</span><span class="o">)</span> <span class="o">{</span>
<span class="k">function</span> <span class="nx">_zeroPad</span><span class="o">(</span><span class="nx">v</span><span class="o">)</span> <span class="o">{</span>
<span class="k">return</span> <span class="nx">v</span> <span class="o">&lt;</span> <span class="m">10</span> <span class="o">?</span> <span class="s1">&#39;0&#39;</span> <span class="o">+</span> <span class="nx">v</span> <span class="o">:</span> <span class="nx">v</span><span class="o">;</span>
<span class="o">}</span>
<span class="k">return</span> <span class="s1">&#39;&quot;&#39;</span> <span class="o">+</span> <span class="nx">d</span><span class="o">.</span><span class="nx">getUTCFullYear</span><span class="o">()</span> <span class="o">+</span> <span class="s1">&#39;-&#39;</span> <span class="o">+</span>
<span class="nx">_zeroPad</span><span class="o">(</span><span class="nx">d</span><span class="o">.</span><span class="nx">getUTCMonth</span><span class="o">()</span> <span class="o">+</span> <span class="m">1</span><span class="o">)</span> <span class="o">+</span> <span class="s1">&#39;-&#39;</span> <span class="o">+</span>
<span class="nx">_zeroPad</span><span class="o">(</span><span class="nx">d</span><span class="o">.</span><span class="nx">getUTCDate</span><span class="o">())</span> <span class="o">+</span> <span class="s1">&#39;T&#39;</span> <span class="o">+</span>
<span class="nx">_zeroPad</span><span class="o">(</span><span class="nx">d</span><span class="o">.</span><span class="nx">getUTCHours</span><span class="o">())</span> <span class="o">+</span> <span class="s1">&#39;:&#39;</span> <span class="o">+</span>
<span class="nx">_zeroPad</span><span class="o">(</span><span class="nx">d</span><span class="o">.</span><span class="nx">getUTCMinutes</span><span class="o">())</span> <span class="o">+</span> <span class="s1">&#39;:&#39;</span> <span class="o">+</span>
<span class="nx">_zeroPad</span><span class="o">(</span><span class="nx">d</span><span class="o">.</span><span class="nx">getUTCSeconds</span><span class="o">())</span> <span class="o">+</span> <span class="s1">&#39;Z&quot;&#39;</span><span class="o">;</span>
<span class="o">},</span>
<span class="c">/**</span>
<span class="c"> * Converts an arbitrary value to a JSON string representation.</span>
<span class="c"> * Cyclical object or array references are replaced with null.</span>
<span class="c"> * If a whitelist is provided, only matching object keys will be included.</span>
<span class="c"> * If a depth limit is provided, objects and arrays at that depth will</span>
<span class="c"> * be stringified as empty.</span>
<span class="c"> * @method stringify</span>
<span class="c"> * @param o {MIXED} any arbitrary object to convert to JSON string</span>
<span class="c"> * @param w {Array} (optional) whitelist of acceptable object keys to include</span>
<span class="c"> * @param d {number} (optional) depth limit to recurse objects/arrays (practical minimum 1)</span>
<span class="c"> * @return {string} JSON string representation of the input</span>
<span class="c"> * @static</span>
<span class="c"> * @public</span>
<span class="c"> */</span>
<span class="nx">stringify</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">w</span><span class="o">,</span><span class="nx">d</span><span class="o">)</span> <span class="o">{</span>
<span class="k">var</span> <span class="nx">m</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">_CHARS</span><span class="o">,</span>
<span class="nx">str_re</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">_SPECIAL_CHARS</span><span class="o">,</span>
<span class="nx">rep</span> <span class="o">=</span> <span class="k">typeof</span> <span class="nx">w</span> <span class="o">===</span> <span class="s1">&#39;function&#39;</span> <span class="o">?</span> <span class="nx">w</span> <span class="o">:</span> <span class="kc">null</span><span class="o">,</span>
<span class="nx">pstack</span> <span class="o">=</span> <span class="o">[];</span> <span class="c">// Processing stack used for cyclical ref protection</span>
<span class="c"></span>
<span class="k">if</span> <span class="o">(</span><span class="nx">rep</span> <span class="o">||</span> <span class="k">typeof</span> <span class="nx">w</span> <span class="o">!==</span> <span class="s1">&#39;object&#39;</span><span class="o">)</span> <span class="o">{</span>
<span class="nx">w</span> <span class="o">=</span> <span class="kc">undefined</span><span class="o">;</span>
<span class="o">}</span>
<span class="c">// escape encode special characters</span>
<span class="c"></span> <span class="k">var</span> <span class="nx">_char</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">if</span> <span class="o">(!</span><span class="nx">m</span><span class="o">[</span><span class="nx">c</span><span class="o">])</span> <span class="o">{</span>
<span class="k">var</span> <span class="nx">a</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="nx">m</span><span class="o">[</span><span class="nx">c</span><span class="o">]</span> <span class="o">=</span> <span class="s1">&#39;\\u00&#39;</span> <span class="o">+</span> <span class="nb">Math</span><span class="o">.</span><span class="nx">floor</span><span class="o">(</span><span class="nx">a</span> <span class="o">/</span> <span class="m">16</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="o">+</span>
<span class="o">(</span><span class="nx">a</span> <span class="o">%</span> <span class="m">16</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="o">}</span>
<span class="k">return</span> <span class="nx">m</span><span class="o">[</span><span class="nx">c</span><span class="o">];</span>
<span class="o">};</span>
<span class="c">// Enclose the escaped string in double quotes</span>
<span class="c"></span> <span class="k">var</span> <span class="nx">_string</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="o">{</span>
<span class="k">return</span> <span class="s1">&#39;&quot;&#39;</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">str_re</span><span class="o">,</span> <span class="nx">_char</span><span class="o">)</span> <span class="o">+</span> <span class="s1">&#39;&quot;&#39;</span><span class="o">;</span>
<span class="o">};</span>
<span class="c">// Use the configured date conversion</span>
<span class="c"></span> <span class="k">var</span> <span class="nx">_date</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">dateToString</span><span class="o">;</span>
<span class="c">// Worker function. Fork behavior on data type and recurse objects and</span>
<span class="c"></span> <span class="c">// arrays per the configured depth.</span>
<span class="c"></span> <span class="k">var</span> <span class="nx">_stringify</span> <span class="o">=</span> <span class="k">function</span> <span class="o">(</span><span class="nx">h</span><span class="o">,</span><span class="nx">key</span><span class="o">,</span><span class="nx">d</span><span class="o">)</span> <span class="o">{</span>
<span class="k">var</span> <span class="nx">o</span> <span class="o">=</span> <span class="k">typeof</span> <span class="nx">rep</span> <span class="o">===</span> <span class="s1">&#39;function&#39;</span> <span class="o">?</span> <span class="nx">rep</span><span class="o">.</span><span class="nx">call</span><span class="o">(</span><span class="nx">h</span><span class="o">,</span><span class="nx">key</span><span class="o">,</span><span class="nx">h</span><span class="o">[</span><span class="nx">key</span><span class="o">])</span> <span class="o">:</span> <span class="nx">h</span><span class="o">[</span><span class="nx">key</span><span class="o">],</span>
<span class="nx">t</span> <span class="o">=</span> <span class="k">typeof</span> <span class="nx">o</span><span class="o">,</span>
<span class="nx">i</span><span class="o">,</span><span class="nx">len</span><span class="o">,</span><span class="nx">j</span><span class="o">,</span> <span class="c">// array iteration</span>
<span class="c"></span> <span class="nx">k</span><span class="o">,</span><span class="nx">v</span><span class="o">,</span> <span class="c">// object iteration</span>
<span class="c"></span> <span class="nx">a</span><span class="o">;</span> <span class="c">// composition array for performance over string concat</span>
<span class="c"></span>
<span class="c">// String</span>
<span class="c"></span> <span class="k">if</span> <span class="o">(</span><span class="nx">t</span> <span class="o">===</span> <span class="s1">&#39;string&#39;</span><span class="o">)</span> <span class="o">{</span>
<span class="k">return</span> <span class="nx">_string</span><span class="o">(</span><span class="nx">o</span><span class="o">);</span>
<span class="o">}</span>
<span class="c">// native boolean and Boolean instance</span>
<span class="c"></span> <span class="k">if</span> <span class="o">(</span><span class="nx">t</span> <span class="o">===</span> <span class="s1">&#39;boolean&#39;</span> <span class="o">||</span> <span class="nx">o</span> <span class="k">instanceof</span> <span class="nb">Boolean</span><span class="o">)</span> <span class="o">{</span>
<span class="k">return</span> <span class="nb">String</span><span class="o">(</span><span class="nx">o</span><span class="o">);</span>
<span class="o">}</span>
<span class="c">// native number and Number instance</span>
<span class="c"></span> <span class="k">if</span> <span class="o">(</span><span class="nx">t</span> <span class="o">===</span> <span class="s1">&#39;number&#39;</span> <span class="o">||</span> <span class="nx">o</span> <span class="k">instanceof</span> <span class="nb">Number</span><span class="o">)</span> <span class="o">{</span>
<span class="k">return</span> <span class="nb">isFinite</span><span class="o">(</span><span class="nx">o</span><span class="o">)</span> <span class="o">?</span> <span class="nb">String</span><span class="o">(</span><span class="nx">o</span><span class="o">)</span> <span class="o">:</span> <span class="s1">&#39;null&#39;</span><span class="o">;</span>
<span class="o">}</span>
<span class="c">// Date</span>
<span class="c"></span> <span class="k">if</span> <span class="o">(</span><span class="nx">o</span> <span class="k">instanceof</span> <span class="nb">Date</span><span class="o">)</span> <span class="o">{</span>
<span class="k">return</span> <span class="nx">_date</span><span class="o">(</span><span class="nx">o</span><span class="o">);</span>
<span class="o">}</span>
<span class="c">// Object types</span>
<span class="c"></span> <span class="k">if</span> <span class="o">(</span><span class="nx">t</span> <span class="o">===</span> <span class="s1">&#39;object&#39;</span><span class="o">)</span> <span class="o">{</span>
<span class="k">if</span> <span class="o">(!</span><span class="nx">o</span><span class="o">)</span> <span class="o">{</span>
<span class="k">return</span> <span class="s1">&#39;null&#39;</span><span class="o">;</span>
<span class="o">}</span>
<span class="c">// Check for cyclical references</span>
<span class="c"></span> <span class="k">for</span> <span class="o">(</span><span class="nx">i</span> <span class="o">=</span> <span class="nx">pstack</span><span class="o">.</span><span class="nx">length</span> <span class="o">-</span> <span class="m">1</span><span class="o">;</span> <span class="nx">i</span> <span class="o">&gt;=</span> <span class="m">0</span><span class="o">;</span> <span class="o">--</span><span class="nx">i</span><span class="o">)</span> <span class="o">{</span>
<span class="k">if</span> <span class="o">(</span><span class="nx">pstack</span><span class="o">[</span><span class="nx">i</span><span class="o">]</span> <span class="o">===</span> <span class="nx">o</span><span class="o">)</span> <span class="o">{</span>
<span class="k">return</span> <span class="s1">&#39;null&#39;</span><span class="o">;</span>
<span class="o">}</span>
<span class="o">}</span>
<span class="c">// Add the object to the processing stack</span>
<span class="c"></span> <span class="nx">pstack</span><span class="o">[</span><span class="nx">pstack</span><span class="o">.</span><span class="nx">length</span><span class="o">]</span> <span class="o">=</span> <span class="nx">o</span><span class="o">;</span>
<span class="nx">a</span> <span class="o">=</span> <span class="o">[];</span>
<span class="c">// Only recurse if we&#39;re above depth config</span>
<span class="c"></span> <span class="k">if</span> <span class="o">(</span><span class="nx">d</span> <span class="o">&gt;</span> <span class="m">0</span><span class="o">)</span> <span class="o">{</span>
<span class="c">// Array</span>
<span class="c"></span> <span class="k">if</span> <span class="o">(</span><span class="nx">isA</span><span class="o">(</span><span class="nx">o</span><span class="o">))</span> <span class="o">{</span>
<span class="k">for</span> <span class="o">(</span><span class="nx">i</span> <span class="o">=</span> <span class="nx">o</span><span class="o">.</span><span class="nx">length</span> <span class="o">-</span> <span class="m">1</span><span class="o">;</span> <span class="nx">i</span> <span class="o">&gt;=</span> <span class="m">0</span><span class="o">;</span> <span class="o">--</span><span class="nx">i</span><span class="o">)</span> <span class="o">{</span>
<span class="nx">a</span><span class="o">[</span><span class="nx">i</span><span class="o">]</span> <span class="o">=</span> <span class="nx">_stringify</span><span class="o">(</span><span class="nx">o</span><span class="o">,</span><span class="nx">i</span><span class="o">,</span><span class="nx">d</span><span class="o">-</span><span class="m">1</span><span class="o">)</span> <span class="o">||</span> <span class="s1">&#39;null&#39;</span><span class="o">;</span>
<span class="o">}</span>
<span class="c">// Object</span>
<span class="c"></span> <span class="o">}</span> <span class="k">else</span> <span class="o">{</span>
<span class="c">// If whitelist provided, take only those keys</span>
<span class="c"></span> <span class="nx">k</span> <span class="o">=</span> <span class="nx">isA</span><span class="o">(</span><span class="nx">w</span><span class="o">)</span> <span class="o">?</span> <span class="nx">w</span> <span class="o">:</span> <span class="nx">Y</span><span class="o">.</span><span class="nb">Object</span><span class="o">.</span><span class="nx">keys</span><span class="o">(</span><span class="nx">w</span><span class="o">||</span><span class="nx">o</span><span class="o">);</span>
<span class="k">for</span> <span class="o">(</span><span class="nx">i</span> <span class="o">=</span> <span class="m">0</span><span class="o">,</span> <span class="nx">j</span> <span class="o">=</span> <span class="m">0</span><span class="o">,</span> <span class="nx">len</span> <span class="o">=</span> <span class="nx">k</span><span class="o">.</span><span class="nx">length</span><span class="o">;</span> <span class="nx">i</span> <span class="o">&lt;</span> <span class="nx">len</span><span class="o">;</span> <span class="o">++</span><span class="nx">i</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">k</span><span class="o">[</span><span class="nx">i</span><span class="o">]</span> <span class="o">===</span> <span class="s1">&#39;string&#39;</span><span class="o">)</span> <span class="o">{</span>
<span class="nx">v</span> <span class="o">=</span> <span class="nx">_stringify</span><span class="o">(</span><span class="nx">o</span><span class="o">,</span><span class="nx">k</span><span class="o">[</span><span class="nx">i</span><span class="o">],</span><span class="nx">d</span><span class="o">-</span><span class="m">1</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="o">{</span>
<span class="nx">a</span><span class="o">[</span><span class="nx">j</span><span class="o">++]</span> <span class="o">=</span> <span class="nx">_string</span><span class="o">(</span><span class="nx">k</span><span class="o">[</span><span class="nx">i</span><span class="o">])</span> <span class="o">+</span> <span class="s1">&#39;:&#39;</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="o">}</span>
<span class="c">// remove the array from the stack</span>
<span class="c"></span> <span class="nx">pstack</span><span class="o">.</span><span class="nx">pop</span><span class="o">();</span>
<span class="k">return</span> <span class="nx">isA</span><span class="o">(</span><span class="nx">o</span><span class="o">)</span> <span class="o">?</span> <span class="s1">&#39;[&#39;</span><span class="o">+</span><span class="nx">a</span><span class="o">.</span><span class="nx">join</span><span class="o">(</span><span class="s1">&#39;,&#39;</span><span class="o">)+</span><span class="s1">&#39;]&#39;</span> <span class="o">:</span> <span class="s1">&#39;{&#39;</span><span class="o">+</span><span class="nx">a</span><span class="o">.</span><span class="nx">join</span><span class="o">(</span><span class="s1">&#39;,&#39;</span><span class="o">)+</span><span class="s1">&#39;}&#39;</span><span class="o">;</span>
<span class="o">}</span>
<span class="k">return</span> <span class="kc">undefined</span><span class="o">;</span> <span class="c">// invalid input</span>
<span class="c"></span> <span class="o">};</span>
<span class="c">// Default depth to POSITIVE_INFINITY</span>
<span class="c"></span> <span class="nx">d</span> <span class="o">=</span> <span class="nx">d</span> <span class="o">&gt;=</span> <span class="m">0</span> <span class="o">?</span> <span class="nx">d</span> <span class="o">:</span> <span class="m">1</span><span class="o">/</span><span class="m">0</span><span class="o">;</span>
<span class="c">// process the input</span>
<span class="c"></span> <span class="k">return</span> <span class="nx">_stringify</span><span class="o">({</span><span class="s1">&#39;&#39;</span><span class="o">:</span><span class="nx">o</span><span class="o">},</span><span class="s1">&#39;&#39;</span><span class="o">,</span><span class="nx">d</span><span class="o">);</span>
<span class="o">}</span>
<span class="o">});</span>
</pre></div>
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