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CSS Post-Processor that chunks CSS files per IE9 selector count restrictions

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<!doctype html> <html lang="en"> <head> <title>Code coverage report for src/count.js</title> <meta charset="utf-8" /> <link rel="stylesheet" href="../prettify.css" /> <link rel="stylesheet" href="../base.css" /> <meta name="viewport" content="width=device-width, initial-scale=1"> <style type='text/css'> .coverage-summary .sorter { background-image: url(../sort-arrow-sprite.png); } </style> </head> <body> <div class='wrapper'> <div class='pad1'> <h1> <a href="../index.html">all files</a> / <a href="index.html">src/</a> count.js </h1> <div class='clearfix'> <div class='fl pad1y space-right2'> <span class="strong">55.17% </span> <span class="quiet">Statements</span> <span class='fraction'>16/29</span> </div> <div class='fl pad1y space-right2'> <span class="strong">66.67% </span> <span class="quiet">Branches</span> <span class='fraction'>10/15</span> </div> <div class='fl pad1y space-right2'> <span class="strong">30% </span> <span class="quiet">Functions</span> <span class='fraction'>3/10</span> </div> <div class='fl pad1y space-right2'> <span class="strong">53.57% </span> <span class="quiet">Lines</span> <span class='fraction'>15/28</span> </div> </div> </div> <div class='status-line medium'></div> <pre><table class="coverage"> <tr><td class="line-count quiet">1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68</td><td class="line-coverage quiet"><span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-yes"></span> <span class="cline-any cline-yes"></span> <span class="cline-any cline-yes"></span> <span class="cline-any cline-yes"></span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-yes"></span> <span class="cline-any cline-yes"></span> <span class="cline-any cline-yes">24×</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-yes">196×</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-no">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-yes">80×</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-yes">86×</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-yes"></span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-yes">22×</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-yes"></span> <span class="cline-any cline-no">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-no">&nbsp;</span> <span class="cline-any cline-no">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-no">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-yes"></span> <span class="cline-any cline-no">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-no">&nbsp;</span> <span class="cline-any cline-no">&nbsp;</span> <span class="cline-any cline-no">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-no">&nbsp;</span> <span class="cline-any cline-no">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-no">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-no">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-yes"></span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">/* eslint no-use-before-define: 0 */ import fsp from 'fs-promise'; import css from 'css'; import { SELECTOR_LIMIT } from './constants'; import { expand } from './fs-utils'; &nbsp; function count(ast) { function countRules(rules) { return rules.reduce((acc, rule) =&gt; acc + count(rule), 0); } &nbsp; switch (ast.type) { case <span class="branch-0 cbranch-no" title="branch not covered" >'stylesheet':</span> return <span class="cstat-no" title="statement not covered" >countRules(ast.stylesheet.rules);</span> case 'rule': return ast.selectors.length; // Don't affect selector limit case 'comment': case 'font-face': case 'keyframes': case 'import': case 'supports': case 'charset': case 'namespace': return 0; case 'page': return 1; default: return countRules(ast.rules); } } &nbsp; <span class="fstat-no" title="function not covered" >function countFile(filepath, options) {</span> return <span class="cstat-no" title="statement not covered" >fsp.readFile(filepath, { encoding: 'utf8' })</span> .then(<span class="fstat-no" title="function not covered" >contents =&gt; {</span> let <span class="cstat-no" title="statement not covered" >ast = css.parse(contents);</span> let <span class="cstat-no" title="statement not covered" >selectorCount = count(ast);</span> &nbsp; return <span class="cstat-no" title="statement not covered" >{</span> filepath, selectorCount, exceedsLimit: selectorCount &gt; SELECTOR_LIMIT }; }); } &nbsp; <span class="fstat-no" title="function not covered" >function countPath(filepath, options) {</span> options = <span class="cstat-no" title="statement not covered" >options || {};</span> &nbsp; return <span class="cstat-no" title="statement not covered" >expand(filepath)</span> .filter(<span class="fstat-no" title="function not covered" >x =&gt; <span class="cstat-no" title="statement not covered" >/\.css$/.test(x))</span></span> .map(<span class="fstat-no" title="function not covered" >x =&gt; <span class="cstat-no" title="statement not covered" >countFile(x, options))</span></span> .flatMap(<span class="fstat-no" title="function not covered" >x =&gt; {</span> if (<span class="cstat-no" title="statement not covered" >options.progress) {</span> options.<span class="cstat-no" title="statement not covered" >progress(x.filepath);</span> } &nbsp; return <span class="cstat-no" title="statement not covered" >x;</span> }) .reduce(<span class="fstat-no" title="function not covered" >(acc, x) =&gt; <span class="cstat-no" title="statement not covered" >acc.concat([x]), [])</span></span> .toPromise(Promise); } &nbsp; export default { count, countPath }; &nbsp;</pre></td></tr> </table></pre> <div class='push'></div><!-- for sticky footer --> </div><!-- /wrapper --> <div class='footer quiet pad2 space-top1 center small'> Code coverage generated by <a href="http://istanbul-js.org/" target="_blank">istanbul</a> at Tue Jun 28 2016 20:59:20 GMT-0600 (MDT) </div> </div> <script src="../prettify.js"></script> <script> window.onload = function () { if (typeof prettyPrint === 'function') { prettyPrint(); } }; </script> <script src="../sorter.js"></script> </body> </html>