experimental support for jQuery CSS pseudo-selectors

fixes madrobby#323
buddydvd · Apr 24, 2013 · 96aad6f · 96aad6f
1 parent d5e54e4
commit 96aad6f
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diff --git a/README.md b/README.md
@@ -124,6 +124,16 @@ href="https://github.com/madrobby/zepto/blob/master/src/data.js#files">data</a><
       objects in memory.
     </td>
   </tr>
+  <tr>
+    <th><a
+href="https://github.com/madrobby/zepto/blob/master/src/selector.js#files">selector</a></th>
+    <td></td>
+    <td>
+      Experimental <a href="http://api.jquery.com/category/selectors/jquery-selector-extensions/">jQuery
+      CSS extensions</a> support for functionality such as <code>$('div:first')</code> and
+      <code>el.is(':visible')</code>.
+    </td>
+  </tr>
   <tr>
     <th><a href="https://github.com/madrobby/zepto/blob/master/src/touch.js#files">touch</a></th>
     <td>✔</td>

diff --git a/src/selector.js b/src/selector.js
@@ -0,0 +1,62 @@
+;(function($){
+  var zepto = $.zepto, oldQsa = zepto.qsa, oldMatches = zepto.matches
+
+  function visible(elem){
+    elem = $(elem)
+    return !!(elem.width() || elem.height()) && elem.css("display") !== "none"
+  }
+
+  // Implements a subset from:
+  // http://api.jquery.com/category/selectors/jquery-selector-extensions/
+  //
+  // Complex selectors are not supported:
+  //   li:has(label:contains("foo")) + li:has(label:contains("bar"))
+  //   "> h2"
+  //   ul.inner:first > li
+  var filters = {
+    visible: function(){ return visible(this) },
+    hidden: function(){ return !visible(this) },
+    selected: function(){ return this.selected },
+    checked: function(){ return this.checked },
+    first: function(idx){ return idx === 0 },
+    eq: function(idx, value){ return idx === value },
+    contains: function(idx, text){ return $(this).text().indexOf(text) > -1 },
+    has: function(idx, sel){ return zepto.qsa(this, sel).length }
+  }
+
+  var re = new RegExp('(.*):(\\w+)(?:\\(([^)]+)\\))?$\\s*')
+
+  function process(sel, fn) {
+    var filter, arg, match = sel.match(re)
+    if (match && match[2] in filters) {
+      var filter = filters[match[2]], arg = match[3]
+      sel = match[1]
+      if (arg) {
+        var num = Number(arg)
+        if (isNaN(num)) arg = arg.replace(/^["']|["']$/g, '')
+        else arg = num
+      }
+    }
+    return fn(sel, filter, arg)
+  }
+
+  zepto.qsa = function(node, selector) {
+    return process(selector, function(sel, filter, arg){
+      try {
+        if (!sel && filter) sel = '*'
+        var nodes = oldQsa(node, sel)
+      } catch(e) {
+        console.error('error performing selector: %o', selector)
+        throw e
+      }
+      return !filter ? nodes : nodes.filter(function(el, i){ return filter.call(el, i, arg) })
+    })
+  }
+
+  zepto.matches = function(node, selector){
+    return process(selector, function(sel, filter, arg){
+      return (!sel || oldMatches(node, sel)) &&
+        (!filter || filter.call(node, null, arg))
+    })
+  }
+})(Zepto)
diff --git a/test/selector.html b/test/selector.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
+  <link rel="stylesheet" href="test.css">
+  <title>Zepto selector tests</title>
+  <script src="../vendor/evidence.js"></script>
+  <script src="evidence_runner.js"></script>
+  <script src="../src/polyfill.js"></script>
+  <script src="../src/zepto.js"></script>
+  <script src="../src/selector.js"></script>
+</head>
+<body>
+  <h1>Zepto selector tests</h1>
+  <p id="results">
+    Running… see browser console for results
+  </p>
+  <div id="fixtures">
+    <ul id=list><li>one</li><li>two</li><ul>
+    <div class=visibility id=vis>look at me!</div>
+    <div class=visibility id=invis style="display:none">can't see me</div>
+  </div><!-- fixtures -->
+
+  <script>
+  (function(){
+    Evidence('ZeptoTest', {
+      testFirst: function(t) {
+        var li = $('#list li:first')
+        t.assertEqual(1, li.size())
+        t.assertEqual('one', li.text())
+        t.assertEqual('two', $('#list li:eq(1)').text())
+      },
+      testContains: function(t) {
+        t.assertEqual('two', $('#list li:contains("two")').text())
+      },
+      testVisibility: function(t) {
+        t.assertEqual('vis', $('.visibility:visible').attr('id'))
+        t.assertEqual('invis', $('.visibility:hidden').attr('id'))
+      },
+      testIs: function(t) {
+        t.assert($('#list').is('ul'))
+        t.assert($('#vis').is(':visible'))
+        t.refute($('#invis').is(':visible'))
+      }
+    })
+  })()
+  </script>
+</body>
+</html>