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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/170001">170001</a></dd>
<dt>Author</dt> <dd>benjamin@webkit.org</dd>
<dt>Date</dt> <dd>2014-06-15 23:54:08 -0700 (Sun, 15 Jun 2014)</dd>
</dl>

<h3>Log Message</h3>
<pre>CSS JIT: add support for the :lang() pseudo class
https://bugs.webkit.org/show_bug.cgi?id=133913

Reviewed by Andreas Kling.


Source/WebCore: 
The selector is already very expensive to begin with, just implement it with
a function call.

It is also done after every other filter since it is so inefficient.

Tests: fast/selectors/lang-conflict.html
       fast/selectors/lang-empty.html
       fast/selectors/lang-specificity-xml.xhtml
       fast/selectors/lang-specificity.html

* css/SelectorChecker.cpp:
(WebCore::SelectorChecker::checkOne):
* css/SelectorCheckerTestFunctions.h:
(WebCore::matchesLangPseudoClass):
* cssjit/SelectorCompiler.cpp:
(WebCore::SelectorCompiler::SelectorFragment::SelectorFragment):
(WebCore::SelectorCompiler::addPseudoClassType):
(WebCore::SelectorCompiler::SelectorCodeGenerator::generateElementMatching):
(WebCore::SelectorCompiler::SelectorCodeGenerator::generateElementIsInLanguage):
* dom/Element.cpp:
(WebCore::Element::computeInheritedLanguage):
* dom/ElementData.cpp:
(WebCore::ElementData::findLanguageAttribute):
* dom/ElementData.h:

LayoutTests: 
* fast/selectors/lang-conflict-expected.txt: Added.
* fast/selectors/lang-conflict.html: Added.
* fast/selectors/lang-empty-expected.txt: Added.
* fast/selectors/lang-empty.html: Added.
* fast/selectors/lang-specificity-expected.txt: Added.
* fast/selectors/lang-specificity-xml-expected.txt: Added.
* fast/selectors/lang-specificity-xml.xhtml: Added.
* fast/selectors/lang-specificity.html: Added.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkLayoutTestsChangeLog">trunk/LayoutTests/ChangeLog</a></li>
<li><a href="#trunkSourceWebCoreChangeLog">trunk/Source/WebCore/ChangeLog</a></li>
<li><a href="#trunkSourceWebCorecssSelectorCheckercpp">trunk/Source/WebCore/css/SelectorChecker.cpp</a></li>
<li><a href="#trunkSourceWebCorecssSelectorCheckerTestFunctionsh">trunk/Source/WebCore/css/SelectorCheckerTestFunctions.h</a></li>
<li><a href="#trunkSourceWebCorecssjitSelectorCompilercpp">trunk/Source/WebCore/cssjit/SelectorCompiler.cpp</a></li>
<li><a href="#trunkSourceWebCoredomElementcpp">trunk/Source/WebCore/dom/Element.cpp</a></li>
<li><a href="#trunkSourceWebCoredomElementDatacpp">trunk/Source/WebCore/dom/ElementData.cpp</a></li>
<li><a href="#trunkSourceWebCoredomElementDatah">trunk/Source/WebCore/dom/ElementData.h</a></li>
</ul>

<h3>Added Paths</h3>
<ul>
<li><a href="#trunkLayoutTestsfastselectorslangconflictexpectedtxt">trunk/LayoutTests/fast/selectors/lang-conflict-expected.txt</a></li>
<li><a href="#trunkLayoutTestsfastselectorslangconflicthtml">trunk/LayoutTests/fast/selectors/lang-conflict.html</a></li>
<li><a href="#trunkLayoutTestsfastselectorslangemptyexpectedtxt">trunk/LayoutTests/fast/selectors/lang-empty-expected.txt</a></li>
<li><a href="#trunkLayoutTestsfastselectorslangemptyhtml">trunk/LayoutTests/fast/selectors/lang-empty.html</a></li>
<li><a href="#trunkLayoutTestsfastselectorslangspecificityexpectedtxt">trunk/LayoutTests/fast/selectors/lang-specificity-expected.txt</a></li>
<li><a href="#trunkLayoutTestsfastselectorslangspecificityxmlexpectedtxt">trunk/LayoutTests/fast/selectors/lang-specificity-xml-expected.txt</a></li>
<li><a href="#trunkLayoutTestsfastselectorslangspecificityxmlxhtml">trunk/LayoutTests/fast/selectors/lang-specificity-xml.xhtml</a></li>
<li><a href="#trunkLayoutTestsfastselectorslangspecificityhtml">trunk/LayoutTests/fast/selectors/lang-specificity.html</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkLayoutTestsChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/ChangeLog (170000 => 170001)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/ChangeLog        2014-06-16 04:09:25 UTC (rev 170000)
+++ trunk/LayoutTests/ChangeLog        2014-06-16 06:54:08 UTC (rev 170001)
</span><span class="lines">@@ -1,3 +1,19 @@
</span><ins>+2014-06-15  Benjamin Poulain  &lt;benjamin@webkit.org&gt;
+
+        CSS JIT: add support for the :lang() pseudo class
+        https://bugs.webkit.org/show_bug.cgi?id=133913
+
+        Reviewed by Andreas Kling.
+
+        * fast/selectors/lang-conflict-expected.txt: Added.
+        * fast/selectors/lang-conflict.html: Added.
+        * fast/selectors/lang-empty-expected.txt: Added.
+        * fast/selectors/lang-empty.html: Added.
+        * fast/selectors/lang-specificity-expected.txt: Added.
+        * fast/selectors/lang-specificity-xml-expected.txt: Added.
+        * fast/selectors/lang-specificity-xml.xhtml: Added.
+        * fast/selectors/lang-specificity.html: Added.
+
</ins><span class="cx"> 2014-06-14  Simon Fraser  &lt;simon.fraser@apple.com&gt;
</span><span class="cx"> 
</span><span class="cx">         Masks disappear when layers become tiled
</span></span></pre></div>
<a id="trunkLayoutTestsfastselectorslangconflictexpectedtxt"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/fast/selectors/lang-conflict-expected.txt (0 => 170001)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/selectors/lang-conflict-expected.txt                                (rev 0)
+++ trunk/LayoutTests/fast/selectors/lang-conflict-expected.txt        2014-06-16 06:54:08 UTC (rev 170001)
</span><span class="lines">@@ -0,0 +1,12 @@
</span><ins>+Verify selectors with conflicting :lang().
+
+On success, you will see a series of &quot;PASS&quot; messages, followed by &quot;TEST COMPLETE&quot;.
+
+
+PASS document.querySelectorAll(&quot;:lang(fr):lang(en)&quot;).length is 0
+PASS document.querySelectorAll(&quot;:lang(en):lang(fr)&quot;).length is 0
+PASS getComputedStyle(document.getElementById(&quot;target&quot;)).color is &quot;rgb(0, 0, 0)&quot;
+PASS successfullyParsed is true
+
+TEST COMPLETE
+
</ins></span></pre></div>
<a id="trunkLayoutTestsfastselectorslangconflicthtml"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/fast/selectors/lang-conflict.html (0 => 170001)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/selectors/lang-conflict.html                                (rev 0)
+++ trunk/LayoutTests/fast/selectors/lang-conflict.html        2014-06-16 06:54:08 UTC (rev 170001)
</span><span class="lines">@@ -0,0 +1,35 @@
</span><ins>+&lt;!doctype html&gt;
+&lt;html&gt;
+&lt;head&gt;
+&lt;script src=&quot;../../resources/js-test-pre.js&quot;&gt;&lt;/script&gt;
+&lt;style&gt;
+* {
+    color: rgb(0, 0, 0);
+}
+:lang(fr):lang(en) {
+    color: rgb(1, 2, 3);
+}
+
+:lang(en):lang(fr) {
+    color: rgb(4, 5, 6);
+}
+&lt;/style&gt;
+&lt;/head&gt;
+&lt;body&gt;
+    &lt;div style=&quot;display:none&quot;&gt;
+        &lt;a&gt;
+            &lt;b&gt;
+                &lt;c id=&quot;target&quot;&gt;&lt;/c&gt;
+            &lt;/b&gt;
+        &lt;/a&gt;
+    &lt;/div&gt;
+&lt;/body&gt;
+&lt;script&gt;
+description('Verify selectors with conflicting :lang().');
+
+shouldBe('document.querySelectorAll(&quot;:lang(fr):lang(en)&quot;).length', '0');
+shouldBe('document.querySelectorAll(&quot;:lang(en):lang(fr)&quot;).length', '0');
+shouldBeEqualToString('getComputedStyle(document.getElementById(&quot;target&quot;)).color', 'rgb(0, 0, 0)');
+&lt;/script&gt;
+&lt;script src=&quot;../../resources/js-test-post.js&quot;&gt;&lt;/script&gt;
+&lt;/html&gt;
</ins></span></pre></div>
<a id="trunkLayoutTestsfastselectorslangemptyexpectedtxt"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/fast/selectors/lang-empty-expected.txt (0 => 170001)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/selectors/lang-empty-expected.txt                                (rev 0)
+++ trunk/LayoutTests/fast/selectors/lang-empty-expected.txt        2014-06-16 06:54:08 UTC (rev 170001)
</span><span class="lines">@@ -0,0 +1,12 @@
</span><ins>+Verify empty :lang() selectors.
+
+On success, you will see a series of &quot;PASS&quot; messages, followed by &quot;TEST COMPLETE&quot;.
+
+
+PASS document.querySelectorAll(&quot;:lang()&quot;).length threw exception Error: SyntaxError: DOM Exception 12.
+PASS document.querySelectorAll(&quot;:lang() *&quot;).length threw exception Error: SyntaxError: DOM Exception 12.
+PASS getComputedStyle(document.getElementById(&quot;target1&quot;)).color is &quot;rgb(0, 0, 0)&quot;
+PASS successfullyParsed is true
+
+TEST COMPLETE
+
</ins></span></pre></div>
<a id="trunkLayoutTestsfastselectorslangemptyhtml"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/fast/selectors/lang-empty.html (0 => 170001)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/selectors/lang-empty.html                                (rev 0)
+++ trunk/LayoutTests/fast/selectors/lang-empty.html        2014-06-16 06:54:08 UTC (rev 170001)
</span><span class="lines">@@ -0,0 +1,35 @@
</span><ins>+&lt;!doctype html&gt;
+&lt;html&gt;
+&lt;head&gt;
+&lt;script src=&quot;../../resources/js-test-pre.js&quot;&gt;&lt;/script&gt;
+&lt;style&gt;
+* {
+    color: rgb(0, 0, 0);
+}
+:lang() {
+    color: rgb(1, 2, 3);
+}
+
+:lang() * {
+    color: rgb(4, 5, 6);
+}
+&lt;/style&gt;
+&lt;/head&gt;
+&lt;body&gt;
+    &lt;div style=&quot;display:none&quot;&gt;
+        &lt;a&gt;
+            &lt;b&gt;
+                &lt;c id=&quot;target1&quot;&gt;&lt;/c&gt;
+            &lt;/b&gt;
+        &lt;/a&gt;
+    &lt;/div&gt;
+&lt;/body&gt;
+&lt;script&gt;
+description('Verify empty :lang() selectors.');
+
+shouldThrow('document.querySelectorAll(&quot;:lang()&quot;).length');
+shouldThrow('document.querySelectorAll(&quot;:lang() *&quot;).length');
+shouldBeEqualToString('getComputedStyle(document.getElementById(&quot;target1&quot;)).color', 'rgb(0, 0, 0)');
+&lt;/script&gt;
+&lt;script src=&quot;../../resources/js-test-post.js&quot;&gt;&lt;/script&gt;
+&lt;/html&gt;
</ins></span></pre></div>
<a id="trunkLayoutTestsfastselectorslangspecificityexpectedtxt"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/fast/selectors/lang-specificity-expected.txt (0 => 170001)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/selectors/lang-specificity-expected.txt                                (rev 0)
+++ trunk/LayoutTests/fast/selectors/lang-specificity-expected.txt        2014-06-16 06:54:08 UTC (rev 170001)
</span><span class="lines">@@ -0,0 +1,16 @@
</span><ins>+Verify selector specifying multiple :lang() pseudo class.
+
+On success, you will see a series of &quot;PASS&quot; messages, followed by &quot;TEST COMPLETE&quot;.
+
+
+HTML lang only
+PASS document.querySelectorAll(&quot;:lang(fr):lang(fr-be):lang(fr) #target1&quot;).length is 1
+PASS getComputedStyle(document.getElementById(&quot;target1&quot;)).color is &quot;rgb(1, 2, 3)&quot;
+PASS document.querySelectorAll(&quot;:lang(fr):lang(fr-ca) #target2&quot;).length is 1
+PASS getComputedStyle(document.getElementById(&quot;target2&quot;)).color is &quot;rgb(4, 5, 6)&quot;
+PASS document.querySelectorAll(&quot;:lang(fr):lang(fr-ch) #target3&quot;).length is 1
+PASS getComputedStyle(document.getElementById(&quot;target3&quot;)).color is &quot;rgb(7, 8, 9)&quot;
+PASS successfullyParsed is true
+
+TEST COMPLETE
+
</ins></span></pre></div>
<a id="trunkLayoutTestsfastselectorslangspecificityxmlexpectedtxt"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/fast/selectors/lang-specificity-xml-expected.txt (0 => 170001)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/selectors/lang-specificity-xml-expected.txt                                (rev 0)
+++ trunk/LayoutTests/fast/selectors/lang-specificity-xml-expected.txt        2014-06-16 06:54:08 UTC (rev 170001)
</span><span class="lines">@@ -0,0 +1,30 @@
</span><ins>+Verify selector specifying multiple :lang() pseudo class.
+
+On success, you will see a series of &quot;PASS&quot; messages, followed by &quot;TEST COMPLETE&quot;.
+
+
+HTML lang only
+PASS document.querySelectorAll(&quot;:lang(fr):lang(fr-be):lang(fr) #target1&quot;).length is 1
+PASS getComputedStyle(document.getElementById(&quot;target1&quot;)).color is &quot;rgb(1, 2, 3)&quot;
+PASS document.querySelectorAll(&quot;:lang(fr):lang(fr-ca) #target2&quot;).length is 1
+PASS getComputedStyle(document.getElementById(&quot;target2&quot;)).color is &quot;rgb(4, 5, 6)&quot;
+PASS document.querySelectorAll(&quot;:lang(fr):lang(fr-ch) #target3&quot;).length is 1
+PASS getComputedStyle(document.getElementById(&quot;target3&quot;)).color is &quot;rgb(7, 8, 9)&quot;
+XML lang only
+PASS document.querySelectorAll(&quot;:lang(es):lang(es-ar):lang(es) #target4&quot;).length is 1
+PASS getComputedStyle(document.getElementById(&quot;target4&quot;)).color is &quot;rgb(10, 11, 12)&quot;
+PASS document.querySelectorAll(&quot;:lang(es):lang(es-co) #target5&quot;).length is 1
+PASS getComputedStyle(document.getElementById(&quot;target5&quot;)).color is &quot;rgb(13, 14, 15)&quot;
+PASS document.querySelectorAll(&quot;:lang(es):lang(es-mx) #target6&quot;).length is 1
+PASS getComputedStyle(document.getElementById(&quot;target6&quot;)).color is &quot;rgb(16, 17, 18)&quot;
+XML and HTML lang
+PASS document.querySelectorAll(&quot;:lang(xml):lang(xml-lang1):lang(xml) #target7&quot;).length is 1
+PASS getComputedStyle(document.getElementById(&quot;target7&quot;)).color is &quot;rgb(19, 20, 21)&quot;
+PASS document.querySelectorAll(&quot;:lang(xml):lang(xml-lang2) #target8&quot;).length is 1
+PASS getComputedStyle(document.getElementById(&quot;target8&quot;)).color is &quot;rgb(22, 23, 24)&quot;
+PASS document.querySelectorAll(&quot;:lang(xml):lang(xml-lang3) #target9&quot;).length is 1
+PASS getComputedStyle(document.getElementById(&quot;target9&quot;)).color is &quot;rgb(25, 26, 27)&quot;
+PASS successfullyParsed is true
+
+TEST COMPLETE
+
</ins></span></pre></div>
<a id="trunkLayoutTestsfastselectorslangspecificityxmlxhtml"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/fast/selectors/lang-specificity-xml.xhtml (0 => 170001)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/selectors/lang-specificity-xml.xhtml                                (rev 0)
+++ trunk/LayoutTests/fast/selectors/lang-specificity-xml.xhtml        2014-06-16 06:54:08 UTC (rev 170001)
</span><span class="lines">@@ -0,0 +1,134 @@
</span><ins>+&lt;html xmlns=&quot;http://www.w3.org/1999/xhtml&quot;&gt;
+&lt;head&gt;
+&lt;script src=&quot;../../resources/js-test-pre.js&quot;&gt;&lt;/script&gt;
+&lt;style&gt;
+[style=&quot;display:none&quot;] * {
+    color: rgb(0, 0, 0);
+    background-color: rgb(0, 0, 0);
+}
+:lang(fr):lang(fr-be):lang(fr) #target1 {
+    color: rgb(1, 2, 3);
+}
+:lang(fr):lang(fr-ca) #target2 {
+    color: rgb(4, 5, 6);
+}
+:lang(fr-ch):lang(fr) #target3 {
+    color: rgb(7, 8, 9);
+}
+
+:lang(es):lang(es-ar):lang(es) #target4 {
+    color: rgb(10, 11, 12);
+}
+:lang(es):lang(es-co) #target5 {
+    color: rgb(13, 14, 15);
+}
+:lang(es-mx):lang(es) #target6 {
+    color: rgb(16, 17, 18);
+}
+
+:lang(xml):lang(xml-lang1):lang(xml) #target7 {
+    color: rgb(19, 20, 21);
+}
+:lang(xml):lang(xml-lang2) #target8 {
+    color: rgb(22, 23, 24);
+}
+:lang(xml-lang3):lang(xml) #target9 {
+    color: rgb(25, 26, 27);
+}
+
+/* None of those should match. */
+:lang(html):lang(html-lang):lang(html) * {
+    background-color: rgb(1, 1, 1);
+}
+:lang(html):lang(html-lang) * {
+    background-color: rgb(1, 1, 1);
+}
+:lang(html-lang):lang(html) * {
+    background-color: rgb(1, 1, 1);
+}
+&lt;/style&gt;
+&lt;/head&gt;
+&lt;body&gt;
+    &lt;div style=&quot;display:none&quot;&gt;
+        &lt;!-- HTML lang cases. --&gt;
+        &lt;a lang=&quot;FR-BE&quot;&gt;
+            &lt;b&gt;
+                &lt;c id=&quot;target1&quot;&gt;&lt;/c&gt;
+            &lt;/b&gt;
+        &lt;/a&gt;
+        &lt;a lang=&quot;FR-CA&quot;&gt;
+            &lt;b&gt;
+                &lt;c id=&quot;target2&quot;&gt;&lt;/c&gt;
+            &lt;/b&gt;
+        &lt;/a&gt;
+        &lt;a lang=&quot;FR-CH&quot;&gt;
+            &lt;b&gt;
+                &lt;c id=&quot;target3&quot;&gt;&lt;/c&gt;
+            &lt;/b&gt;
+        &lt;/a&gt;
+
+        &lt;!-- XML lang cases. --&gt;
+        &lt;a xml:lang=&quot;es-ar&quot;&gt;
+            &lt;b&gt;
+                &lt;c id=&quot;target4&quot;&gt;&lt;/c&gt;
+            &lt;/b&gt;
+        &lt;/a&gt;
+        &lt;a xml:lang=&quot;es-co&quot;&gt;
+            &lt;b&gt;
+                &lt;c id=&quot;target5&quot;&gt;&lt;/c&gt;
+            &lt;/b&gt;
+        &lt;/a&gt;
+        &lt;a xml:lang=&quot;es-mx&quot;&gt;
+            &lt;b&gt;
+                &lt;c id=&quot;target6&quot;&gt;&lt;/c&gt;
+            &lt;/b&gt;
+        &lt;/a&gt;
+
+        &lt;!-- XML + HTML lang cases. --&gt;
+        &lt;a xml:lang=&quot;xml-lang1&quot; lang=&quot;html-lang&quot;&gt;
+            &lt;b&gt;
+                &lt;c id=&quot;target7&quot;&gt;&lt;/c&gt;
+            &lt;/b&gt;
+        &lt;/a&gt;
+        &lt;a xml:lang=&quot;xml-lang2&quot; lang=&quot;html-lang&quot;&gt;
+            &lt;b&gt;
+                &lt;c id=&quot;target8&quot;&gt;&lt;/c&gt;
+            &lt;/b&gt;
+        &lt;/a&gt;
+        &lt;a xml:lang=&quot;xml-lang3&quot; lang=&quot;html-lang&quot;&gt;
+            &lt;b&gt;
+                &lt;c id=&quot;target9&quot;&gt;&lt;/c&gt;
+            &lt;/b&gt;
+        &lt;/a&gt;
+    &lt;/div&gt;
+&lt;/body&gt;
+&lt;script&gt;
+description('Verify selector specifying multiple :lang() pseudo class.');
+
+debug(&quot;HTML lang only&quot;)
+shouldBe('document.querySelectorAll(&quot;:lang(fr):lang(fr-be):lang(fr) #target1&quot;).length', '1');
+shouldBeEqualToString('getComputedStyle(document.getElementById(&quot;target1&quot;)).color', 'rgb(1, 2, 3)');
+shouldBe('document.querySelectorAll(&quot;:lang(fr):lang(fr-ca) #target2&quot;).length', '1');
+shouldBeEqualToString('getComputedStyle(document.getElementById(&quot;target2&quot;)).color', 'rgb(4, 5, 6)');
+shouldBe('document.querySelectorAll(&quot;:lang(fr):lang(fr-ch) #target3&quot;).length', '1');
+shouldBeEqualToString('getComputedStyle(document.getElementById(&quot;target3&quot;)).color', 'rgb(7, 8, 9)');
+
+debug(&quot;XML lang only&quot;)
+shouldBe('document.querySelectorAll(&quot;:lang(es):lang(es-ar):lang(es) #target4&quot;).length', '1');
+shouldBeEqualToString('getComputedStyle(document.getElementById(&quot;target4&quot;)).color', 'rgb(10, 11, 12)');
+shouldBe('document.querySelectorAll(&quot;:lang(es):lang(es-co) #target5&quot;).length', '1');
+shouldBeEqualToString('getComputedStyle(document.getElementById(&quot;target5&quot;)).color', 'rgb(13, 14, 15)');
+shouldBe('document.querySelectorAll(&quot;:lang(es):lang(es-mx) #target6&quot;).length', '1');
+shouldBeEqualToString('getComputedStyle(document.getElementById(&quot;target6&quot;)).color', 'rgb(16, 17, 18)');
+
+debug(&quot;XML and HTML lang&quot;)
+shouldBe('document.querySelectorAll(&quot;:lang(xml):lang(xml-lang1):lang(xml) #target7&quot;).length', '1');
+shouldBeEqualToString('getComputedStyle(document.getElementById(&quot;target7&quot;)).color', 'rgb(19, 20, 21)');
+shouldBe('document.querySelectorAll(&quot;:lang(xml):lang(xml-lang2) #target8&quot;).length', '1');
+shouldBeEqualToString('getComputedStyle(document.getElementById(&quot;target8&quot;)).color', 'rgb(22, 23, 24)');
+shouldBe('document.querySelectorAll(&quot;:lang(xml):lang(xml-lang3) #target9&quot;).length', '1');
+shouldBeEqualToString('getComputedStyle(document.getElementById(&quot;target9&quot;)).color', 'rgb(25, 26, 27)');
+
+&lt;/script&gt;
+&lt;script src=&quot;../../resources/js-test-post.js&quot;&gt;&lt;/script&gt;
+&lt;/html&gt;
</ins></span></pre></div>
<a id="trunkLayoutTestsfastselectorslangspecificityhtml"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/fast/selectors/lang-specificity.html (0 => 170001)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/selectors/lang-specificity.html                                (rev 0)
+++ trunk/LayoutTests/fast/selectors/lang-specificity.html        2014-06-16 06:54:08 UTC (rev 170001)
</span><span class="lines">@@ -0,0 +1,48 @@
</span><ins>+&lt;!doctype html&gt;
+&lt;html&gt;
+&lt;head&gt;
+&lt;script src=&quot;../../resources/js-test-pre.js&quot;&gt;&lt;/script&gt;
+&lt;style&gt;
+:lang(fr):lang(fr-be):lang(fr) #target1 {
+    color: rgb(1, 2, 3);
+}
+:lang(fr):lang(fr-ca) #target2 {
+    color: rgb(4, 5, 6);
+}
+:lang(fr-ch):lang(fr) #target3 {
+    color: rgb(7, 8, 9);
+}
+&lt;/style&gt;
+&lt;/head&gt;
+&lt;body&gt;
+    &lt;div style=&quot;display:none&quot;&gt;
+        &lt;a lang=&quot;FR-BE&quot;&gt;
+            &lt;b&gt;
+                &lt;c id=&quot;target1&quot;&gt;&lt;/c&gt;
+            &lt;/b&gt;
+        &lt;/a&gt;
+        &lt;a lang=&quot;FR-CA&quot;&gt;
+            &lt;b&gt;
+                &lt;c id=&quot;target2&quot;&gt;&lt;/c&gt;
+            &lt;/b&gt;
+        &lt;/a&gt;
+        &lt;a lang=&quot;FR-CH&quot;&gt;
+            &lt;b&gt;
+                &lt;c id=&quot;target3&quot;&gt;&lt;/c&gt;
+            &lt;/b&gt;
+        &lt;/a&gt;
+    &lt;/div&gt;
+&lt;/body&gt;
+&lt;script&gt;
+description('Verify selector specifying multiple :lang() pseudo class.');
+
+debug(&quot;HTML lang only&quot;)
+shouldBe('document.querySelectorAll(&quot;:lang(fr):lang(fr-be):lang(fr) #target1&quot;).length', '1');
+shouldBeEqualToString('getComputedStyle(document.getElementById(&quot;target1&quot;)).color', 'rgb(1, 2, 3)');
+shouldBe('document.querySelectorAll(&quot;:lang(fr):lang(fr-ca) #target2&quot;).length', '1');
+shouldBeEqualToString('getComputedStyle(document.getElementById(&quot;target2&quot;)).color', 'rgb(4, 5, 6)');
+shouldBe('document.querySelectorAll(&quot;:lang(fr):lang(fr-ch) #target3&quot;).length', '1');
+shouldBeEqualToString('getComputedStyle(document.getElementById(&quot;target3&quot;)).color', 'rgb(7, 8, 9)');
+&lt;/script&gt;
+&lt;script src=&quot;../../resources/js-test-post.js&quot;&gt;&lt;/script&gt;
+&lt;/html&gt;
</ins></span></pre></div>
<a id="trunkSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/ChangeLog (170000 => 170001)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/ChangeLog        2014-06-16 04:09:25 UTC (rev 170000)
+++ trunk/Source/WebCore/ChangeLog        2014-06-16 06:54:08 UTC (rev 170001)
</span><span class="lines">@@ -1,3 +1,35 @@
</span><ins>+2014-06-15  Benjamin Poulain  &lt;benjamin@webkit.org&gt;
+
+        CSS JIT: add support for the :lang() pseudo class
+        https://bugs.webkit.org/show_bug.cgi?id=133913
+
+        Reviewed by Andreas Kling.
+
+        The selector is already very expensive to begin with, just implement it with
+        a function call.
+
+        It is also done after every other filter since it is so inefficient.
+
+        Tests: fast/selectors/lang-conflict.html
+               fast/selectors/lang-empty.html
+               fast/selectors/lang-specificity-xml.xhtml
+               fast/selectors/lang-specificity.html
+
+        * css/SelectorChecker.cpp:
+        (WebCore::SelectorChecker::checkOne):
+        * css/SelectorCheckerTestFunctions.h:
+        (WebCore::matchesLangPseudoClass):
+        * cssjit/SelectorCompiler.cpp:
+        (WebCore::SelectorCompiler::SelectorFragment::SelectorFragment):
+        (WebCore::SelectorCompiler::addPseudoClassType):
+        (WebCore::SelectorCompiler::SelectorCodeGenerator::generateElementMatching):
+        (WebCore::SelectorCompiler::SelectorCodeGenerator::generateElementIsInLanguage):
+        * dom/Element.cpp:
+        (WebCore::Element::computeInheritedLanguage):
+        * dom/ElementData.cpp:
+        (WebCore::ElementData::findLanguageAttribute):
+        * dom/ElementData.h:
+
</ins><span class="cx"> 2014-06-15  Anders Carlsson  &lt;andersca@apple.com&gt;
</span><span class="cx"> 
</span><span class="cx">         Add an autorelease() member function to RetainPtr
</span></span></pre></div>
<a id="trunkSourceWebCorecssSelectorCheckercpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/css/SelectorChecker.cpp (170000 => 170001)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/css/SelectorChecker.cpp        2014-06-16 04:09:25 UTC (rev 170000)
+++ trunk/Source/WebCore/css/SelectorChecker.cpp        2014-06-16 06:54:08 UTC (rev 170001)
</span><span class="lines">@@ -740,19 +740,10 @@
</span><span class="cx">             break;
</span><span class="cx">         case CSSSelector::PseudoClassLang:
</span><span class="cx">             {
</span><del>-                AtomicString value;
-#if ENABLE(VIDEO_TRACK)
-                if (element-&gt;isWebVTTElement())
-                    value = toWebVTTElement(element)-&gt;language();
-                else
-#endif
-                    value = element-&gt;computeInheritedLanguage();
</del><span class="cx">                 const AtomicString&amp; argument = selector-&gt;argument();
</span><del>-                if (value.isEmpty() || !value.startsWith(argument, false))
-                    break;
-                if (value.length() != argument.length() &amp;&amp; value[argument.length()] != '-')
-                    break;
-                return true;
</del><ins>+                if (argument.isNull())
+                    return false;
+                return matchesLangPseudoClass(element, argument.impl());
</ins><span class="cx">             }
</span><span class="cx"> #if ENABLE(FULLSCREEN_API)
</span><span class="cx">         case CSSSelector::PseudoClassFullScreen:
</span></span></pre></div>
<a id="trunkSourceWebCorecssSelectorCheckerTestFunctionsh"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/css/SelectorCheckerTestFunctions.h (170000 => 170001)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/css/SelectorCheckerTestFunctions.h        2014-06-16 04:09:25 UTC (rev 170000)
+++ trunk/Source/WebCore/css/SelectorCheckerTestFunctions.h        2014-06-16 06:54:08 UTC (rev 170001)
</span><span class="lines">@@ -99,6 +99,30 @@
</span><span class="cx">     return element-&gt;willValidate() &amp;&amp; element-&gt;isValidFormControlElement();
</span><span class="cx"> }
</span><span class="cx"> 
</span><ins>+inline bool matchesLangPseudoClass(const Element* element, AtomicStringImpl* filter)
+{
+    AtomicString value;
+#if ENABLE(VIDEO_TRACK)
+    if (element-&gt;isWebVTTElement())
+        value = toWebVTTElement(element)-&gt;language();
+    else
+#endif
+        value = element-&gt;computeInheritedLanguage();
+
+    if (value.isNull())
+        return false;
+
+    if (value.impl() == filter)
+        return true;
+
+    if (value.impl()-&gt;startsWith(filter, false)) {
+        if (value.length() == filter-&gt;length())
+            return true;
+        return value[filter-&gt;length()] == '-';
+    }
+    return false;
+}
+
</ins><span class="cx"> ALWAYS_INLINE bool matchesReadOnlyPseudoClass(const Element* element)
</span><span class="cx"> {
</span><span class="cx">     return element-&gt;matchesReadOnlyPseudoClass();
</span></span></pre></div>
<a id="trunkSourceWebCorecssjitSelectorCompilercpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/cssjit/SelectorCompiler.cpp (170000 => 170001)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/cssjit/SelectorCompiler.cpp        2014-06-16 04:09:25 UTC (rev 170000)
+++ trunk/Source/WebCore/cssjit/SelectorCompiler.cpp        2014-06-16 06:54:08 UTC (rev 170001)
</span><span class="lines">@@ -132,6 +132,7 @@
</span><span class="cx">         , widthFromIndirectAdjacent(0)
</span><span class="cx">         , tagName(nullptr)
</span><span class="cx">         , id(nullptr)
</span><ins>+        , langFilter(nullptr)
</ins><span class="cx">         , onlyMatchesLinksInQuirksMode(true)
</span><span class="cx">     {
</span><span class="cx">     }
</span><span class="lines">@@ -151,6 +152,7 @@
</span><span class="cx"> 
</span><span class="cx">     const QualifiedName* tagName;
</span><span class="cx">     const AtomicString* id;
</span><ins>+    const AtomicString* langFilter;
</ins><span class="cx">     Vector&lt;const AtomicStringImpl*, 1&gt; classNames;
</span><span class="cx">     HashSet&lt;unsigned&gt; pseudoClasses;
</span><span class="cx">     Vector&lt;JSC::FunctionPtr&gt; unoptimizedPseudoClasses;
</span><span class="lines">@@ -226,6 +228,7 @@
</span><span class="cx">     void generateElementIsActive(Assembler::JumpList&amp; failureCases, const SelectorFragment&amp;);
</span><span class="cx">     void generateElementIsFirstChild(Assembler::JumpList&amp; failureCases, const SelectorFragment&amp;);
</span><span class="cx">     void generateElementIsHovered(Assembler::JumpList&amp; failureCases, const SelectorFragment&amp;);
</span><ins>+    void generateElementIsInLanguage(Assembler::JumpList&amp; failureCases, const AtomicString&amp;);
</ins><span class="cx">     void generateElementIsLastChild(Assembler::JumpList&amp; failureCases, const SelectorFragment&amp;);
</span><span class="cx">     void generateElementIsOnlyChild(Assembler::JumpList&amp; failureCases, const SelectorFragment&amp;);
</span><span class="cx">     void generateSynchronizeStyleAttribute(Assembler::RegisterID elementDataArraySizeAndFlags);
</span><span class="lines">@@ -492,7 +495,26 @@
</span><span class="cx"> 
</span><span class="cx">             return functionType;
</span><span class="cx">         }
</span><ins>+    case CSSSelector::PseudoClassLang:
+        {
+            const AtomicString&amp; argument = selector.argument();
+            if (argument.isEmpty())
+                return FunctionType::CannotMatchAnything;
</ins><span class="cx"> 
</span><ins>+            if (!fragment.langFilter)
+                fragment.langFilter = &amp;argument;
+            else if (*fragment.langFilter != argument) {
+                // If there are multiple definition, we only care about the most restrictive one.
+                if (argument.startsWith(*fragment.langFilter, false))
+                    fragment.langFilter = &amp;argument;
+                else if (fragment.langFilter-&gt;startsWith(argument, false))
+                    { } // The existing filter is more restrictive.
+                else
+                    return FunctionType::CannotMatchAnything;
+            }
+            return FunctionType::SimpleSelectorChecker;
+        }
+
</ins><span class="cx">     default:
</span><span class="cx">         break;
</span><span class="cx">     }
</span><span class="lines">@@ -1747,6 +1769,8 @@
</span><span class="cx">         generateElementMatchesNotPseudoClass(matchingPostTagNameFailureCases, fragment);
</span><span class="cx">     if (!fragment.anyFilters.isEmpty())
</span><span class="cx">         generateElementMatchesAnyPseudoClass(matchingPostTagNameFailureCases, fragment);
</span><ins>+    if (fragment.langFilter)
+        generateElementIsInLanguage(matchingPostTagNameFailureCases, *fragment.langFilter);
</ins><span class="cx"> }
</span><span class="cx"> 
</span><span class="cx"> void SelectorCodeGenerator::generateElementDataMatching(Assembler::JumpList&amp; failureCases, const SelectorFragment&amp; fragment)
</span><span class="lines">@@ -2309,6 +2333,18 @@
</span><span class="cx">     }
</span><span class="cx"> }
</span><span class="cx"> 
</span><ins>+void SelectorCodeGenerator::generateElementIsInLanguage(Assembler::JumpList&amp; failureCases, const AtomicString&amp; langFilter)
+{
+    LocalRegisterWithPreference langFilterRegister(m_registerAllocator, JSC::GPRInfo::argumentGPR1);
+    m_assembler.move(Assembler::TrustedImmPtr(langFilter.impl()), langFilterRegister);
+
+    Assembler::RegisterID elementAddress = elementAddressRegister;
+    FunctionCall functionCall(m_assembler, m_registerAllocator, m_stackAllocator, m_functionCalls);
+    functionCall.setFunctionAddress(matchesLangPseudoClass);
+    functionCall.setTwoArguments(elementAddress, langFilterRegister);
+    failureCases.append(functionCall.callAndBranchOnBooleanReturnValue(Assembler::Zero));
+}
+
</ins><span class="cx"> static void setLastChildState(Element* element)
</span><span class="cx"> {
</span><span class="cx">     if (RenderStyle* style = element-&gt;renderStyle())
</span></span></pre></div>
<a id="trunkSourceWebCoredomElementcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/dom/Element.cpp (170000 => 170001)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/dom/Element.cpp        2014-06-16 04:09:25 UTC (rev 170000)
+++ trunk/Source/WebCore/dom/Element.cpp        2014-06-16 06:54:08 UTC (rev 170001)
</span><span class="lines">@@ -2207,27 +2207,26 @@
</span><span class="cx"> 
</span><span class="cx"> AtomicString Element::computeInheritedLanguage() const
</span><span class="cx"> {
</span><del>-    const Node* n = this;
-    AtomicString value;
</del><ins>+    if (const ElementData* elementData = this-&gt;elementData()) {
+        if (const Attribute* attribute = elementData-&gt;findLanguageAttribute())
+            return attribute-&gt;value();
+    }
+
</ins><span class="cx">     // The language property is inherited, so we iterate over the parents to find the first language.
</span><del>-    do {
-        if (n-&gt;isElementNode()) {
-            if (const ElementData* elementData = toElement(n)-&gt;elementData()) {
-                // Spec: xml:lang takes precedence -- http://www.w3.org/TR/xhtml1/#C_7
-                if (const Attribute* attribute = elementData-&gt;findAttributeByName(XMLNames::langAttr))
-                    value = attribute-&gt;value();
-                else if (const Attribute* attribute = elementData-&gt;findAttributeByName(HTMLNames::langAttr))
-                    value = attribute-&gt;value();
</del><ins>+    const Node* currentNode = this;
+    while ((currentNode = currentNode-&gt;parentNode())) {
+        if (currentNode-&gt;isElementNode()) {
+            if (const ElementData* elementData = toElement(*currentNode).elementData()) {
+                if (const Attribute* attribute = elementData-&gt;findLanguageAttribute())
+                    return attribute-&gt;value();
</ins><span class="cx">             }
</span><del>-        } else if (n-&gt;isDocumentNode()) {
</del><ins>+        } else if (currentNode-&gt;isDocumentNode()) {
</ins><span class="cx">             // checking the MIME content-language
</span><del>-            value = toDocument(n)-&gt;contentLanguage();
</del><ins>+            return toDocument(currentNode)-&gt;contentLanguage();
</ins><span class="cx">         }
</span><ins>+    }
</ins><span class="cx"> 
</span><del>-        n = n-&gt;parentNode();
-    } while (n &amp;&amp; value.isNull());
-
-    return value;
</del><ins>+    return nullAtom;
</ins><span class="cx"> }
</span><span class="cx"> 
</span><span class="cx"> Locale&amp; Element::locale() const
</span></span></pre></div>
<a id="trunkSourceWebCoredomElementDatacpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/dom/ElementData.cpp (170000 => 170001)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/dom/ElementData.cpp        2014-06-16 04:09:25 UTC (rev 170000)
+++ trunk/Source/WebCore/dom/ElementData.cpp        2014-06-16 06:54:08 UTC (rev 170001)
</span><span class="lines">@@ -27,7 +27,9 @@
</span><span class="cx"> #include &quot;ElementData.h&quot;
</span><span class="cx"> 
</span><span class="cx"> #include &quot;Attr.h&quot;
</span><ins>+#include &quot;HTMLNames.h&quot;
</ins><span class="cx"> #include &quot;StyleProperties.h&quot;
</span><ins>+#include &quot;XMLNames.h&quot;
</ins><span class="cx"> 
</span><span class="cx"> namespace WebCore {
</span><span class="cx"> 
</span><span class="lines">@@ -218,5 +220,24 @@
</span><span class="cx">     return nullptr;
</span><span class="cx"> }
</span><span class="cx"> 
</span><ins>+const Attribute* ElementData::findLanguageAttribute() const
+{
+    ASSERT(XMLNames::langAttr.localName() == HTMLNames::langAttr.localName());
+
+    const Attribute* attributes = attributeBase();
+    // Spec: xml:lang takes precedence over html:lang -- http://www.w3.org/TR/xhtml1/#C_7
+    const Attribute* languageAttribute = nullptr;
+    for (unsigned i = 0, count = length(); i &lt; count; ++i) {
+        const QualifiedName&amp; name = attributes[i].name();
+        if (name.localName() != HTMLNames::langAttr.localName())
+            continue;
+        if (name.namespaceURI() == XMLNames::langAttr.namespaceURI())
+            return &amp;attributes[i];
+        if (name.namespaceURI() == HTMLNames::langAttr.namespaceURI())
+            languageAttribute = &amp;attributes[i];
+    }
+    return languageAttribute;
</ins><span class="cx"> }
</span><span class="cx"> 
</span><ins>+}
+
</ins></span></pre></div>
<a id="trunkSourceWebCoredomElementDatah"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/dom/ElementData.h (170000 => 170001)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/dom/ElementData.h        2014-06-16 04:09:25 UTC (rev 170000)
+++ trunk/Source/WebCore/dom/ElementData.h        2014-06-16 06:54:08 UTC (rev 170001)
</span><span class="lines">@@ -105,6 +105,7 @@
</span><span class="cx">     unsigned findAttributeIndexByName(const QualifiedName&amp;) const;
</span><span class="cx">     unsigned findAttributeIndexByName(const AtomicString&amp; name, bool shouldIgnoreAttributeCase) const;
</span><span class="cx">     unsigned findAttributeIndexByNameForAttributeNode(const Attr*, bool shouldIgnoreAttributeCase = false) const;
</span><ins>+    const Attribute* findLanguageAttribute() const;
</ins><span class="cx"> 
</span><span class="cx">     bool hasID() const { return !m_idForStyleResolution.isNull(); }
</span><span class="cx">     bool hasClass() const { return !m_classNames.isEmpty(); }
</span></span></pre>
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