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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/214274">214274</a></dd>
<dt>Author</dt> <dd>n_wang@apple.com</dd>
<dt>Date</dt> <dd>2017-03-22 13:30:41 -0700 (Wed, 22 Mar 2017)</dd>
</dl>

<h3>Log Message</h3>
<pre>AX: WebKit is returning the wrong rangeForLine
https://bugs.webkit.org/show_bug.cgi?id=169940

Reviewed by Chris Fleizach.

Source/WebCore:

The AXRangeForLine is being calculated using VisiblePostition, so
when we try to use the index we should validate it using VisiblePosition.

Changes are covered in the modified test.

* accessibility/AXObjectCache.cpp:
(WebCore::AXObjectCache::traverseToOffsetInRange):
(WebCore::AXObjectCache::characterOffsetForIndex):

LayoutTests:

* accessibility/mac/range-for-contenteditable-newline-expected.txt:
* accessibility/mac/range-for-contenteditable-newline.html:</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkLayoutTestsChangeLog">trunk/LayoutTests/ChangeLog</a></li>
<li><a href="#trunkLayoutTestsaccessibilitymacrangeforcontenteditablenewlineexpectedtxt">trunk/LayoutTests/accessibility/mac/range-for-contenteditable-newline-expected.txt</a></li>
<li><a href="#trunkLayoutTestsaccessibilitymacrangeforcontenteditablenewlinehtml">trunk/LayoutTests/accessibility/mac/range-for-contenteditable-newline.html</a></li>
<li><a href="#trunkSourceWebCoreChangeLog">trunk/Source/WebCore/ChangeLog</a></li>
<li><a href="#trunkSourceWebCoreaccessibilityAXObjectCachecpp">trunk/Source/WebCore/accessibility/AXObjectCache.cpp</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkLayoutTestsChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/ChangeLog (214273 => 214274)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/ChangeLog        2017-03-22 20:30:11 UTC (rev 214273)
+++ trunk/LayoutTests/ChangeLog        2017-03-22 20:30:41 UTC (rev 214274)
</span><span class="lines">@@ -1,3 +1,13 @@
</span><ins>+2017-03-22  Nan Wang  &lt;n_wang@apple.com&gt;
+
+        AX: WebKit is returning the wrong rangeForLine
+        https://bugs.webkit.org/show_bug.cgi?id=169940
+
+        Reviewed by Chris Fleizach.
+
+        * accessibility/mac/range-for-contenteditable-newline-expected.txt:
+        * accessibility/mac/range-for-contenteditable-newline.html:
+
</ins><span class="cx"> 2017-03-22  John Wilander  &lt;wilander@apple.com&gt;
</span><span class="cx"> 
</span><span class="cx">         Resource Load Statistics: Fix partitioning bug for client-side cookie access
</span></span></pre></div>
<a id="trunkLayoutTestsaccessibilitymacrangeforcontenteditablenewlineexpectedtxt"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/accessibility/mac/range-for-contenteditable-newline-expected.txt (214273 => 214274)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/accessibility/mac/range-for-contenteditable-newline-expected.txt        2017-03-22 20:30:11 UTC (rev 214273)
+++ trunk/LayoutTests/accessibility/mac/range-for-contenteditable-newline-expected.txt        2017-03-22 20:30:41 UTC (rev 214274)
</span><span class="lines">@@ -7,6 +7,13 @@
</span><span class="cx"> 
</span><span class="cx"> 
</span><span class="cx"> def
</span><ins>+The quick brown fox
+
+jumped over the lazy dog
+
+Text in a pre element
+is displayed in a fixed-width
+font
</ins><span class="cx"> This tests that when there are newline characters within text controls, we can get the correct text range from index and length.
</span><span class="cx"> 
</span><span class="cx"> On success, you will see a series of &quot;PASS&quot; messages, followed by &quot;TEST COMPLETE&quot;.
</span><span class="lines">@@ -19,6 +26,14 @@
</span><span class="cx"> PASS textareaTextHello is 'hello'
</span><span class="cx"> PASS textareaTextWorld is 'world'
</span><span class="cx"> PASS textDEF is 'def'
</span><ins>+PASS rangeForLine is '{21, 25}'
+PASS textLine is 'jumped over the lazy dog'
+PASS firstLine is 0
+PASS secondLine is 1
+PASS rangeForLine is '{22, 30}'
+PASS textLine is 'is displayed in a fixed-width\n'
+PASS firstLine is 0
+FAIL secondLine should be 1. Was 2.
</ins><span class="cx"> PASS successfullyParsed is true
</span><span class="cx"> 
</span><span class="cx"> TEST COMPLETE
</span></span></pre></div>
<a id="trunkLayoutTestsaccessibilitymacrangeforcontenteditablenewlinehtml"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/accessibility/mac/range-for-contenteditable-newline.html (214273 => 214274)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/accessibility/mac/range-for-contenteditable-newline.html        2017-03-22 20:30:11 UTC (rev 214273)
+++ trunk/LayoutTests/accessibility/mac/range-for-contenteditable-newline.html        2017-03-22 20:30:41 UTC (rev 214274)
</span><span class="lines">@@ -12,6 +12,19 @@
</span><span class="cx"> &lt;/div&gt;
</span><span class="cx"> &lt;div id=&quot;textcontrol2&quot; contenteditable=&quot;true&quot;&gt;abc&lt;div&gt;&lt;br&gt;&lt;/div&lt;div&gt;&lt;br&gt;&lt;/div&gt;&lt;div&gt;&lt;br&gt;&lt;/div&gt;&lt;div&gt;def&lt;/div&gt;&lt;/div&gt;
</span><span class="cx"> 
</span><ins>+&lt;div id=&quot;textcontrol3&quot; contenteditable=&quot;true&quot;&gt;
+&lt;p&gt;The quick brown fox&lt;/p&gt;
+&lt;p&gt;jumped over the lazy dog&lt;/p&gt;
+&lt;/div&gt;
+
+&lt;div id=&quot;textcontrol4&quot; contenteditable=&quot;true&quot;&gt;
+&lt;pre&gt;
+Text in a pre element
+is displayed in a fixed-width
+font
+&lt;/pre&gt;
+&lt;/div&gt;
+
</ins><span class="cx"> &lt;div role=&quot;group&quot; id=&quot;console&quot;&gt;&lt;/div&gt;
</span><span class="cx"> 
</span><span class="cx"> &lt;script&gt;
</span><span class="lines">@@ -43,6 +56,28 @@
</span><span class="cx">     var textControl2 = accessibilityController.accessibleElementById(&quot;textcontrol2&quot;);
</span><span class="cx">     var textDEF = textControl2.stringForRange(7, 3);
</span><span class="cx">     shouldBe(&quot;textDEF&quot;, &quot;'def'&quot;);
</span><ins>+    
+    // Test line ranges in contenteditable
+    var textControl3 = accessibilityController.accessibleElementById(&quot;textcontrol3&quot;);
+    var rangeForLine = textControl3.rangeForLine(1);
+    shouldBe(&quot;rangeForLine&quot;, &quot;'{21, 25}'&quot;);
+    var textLine = textControl3.stringForRange(21, 25);
+    shouldBe(&quot;textLine&quot;, &quot;'jumped over the lazy dog'&quot;);
+    var firstLine = textControl3.lineForIndex(20);
+    var secondLine = textControl3.lineForIndex(46);
+    shouldBe(&quot;firstLine&quot;, &quot;0&quot;);
+    shouldBe(&quot;secondLine&quot;, &quot;1&quot;);
+    
+    // pre tag in contenteditable
+    var textControl4 = accessibilityController.accessibleElementById(&quot;textcontrol4&quot;);
+    rangeForLine = textControl4.rangeForLine(1);
+    shouldBe(&quot;rangeForLine&quot;, &quot;'{22, 30}'&quot;);
+    textLine = textControl4.stringForRange(22, 30);
+    shouldBe(&quot;textLine&quot;, &quot;'is displayed in a fixed-width\\n'&quot;);
+    firstLine = textControl4.lineForIndex(21);
+    secondLine = textControl4.lineForIndex(52);
+    shouldBe(&quot;firstLine&quot;, &quot;0&quot;);
+    shouldBe(&quot;secondLine&quot;, &quot;1&quot;);
</ins><span class="cx"> 
</span><span class="cx"> &lt;/script&gt;
</span><span class="cx"> 
</span></span></pre></div>
<a id="trunkSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/ChangeLog (214273 => 214274)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/ChangeLog        2017-03-22 20:30:11 UTC (rev 214273)
+++ trunk/Source/WebCore/ChangeLog        2017-03-22 20:30:41 UTC (rev 214274)
</span><span class="lines">@@ -1,3 +1,19 @@
</span><ins>+2017-03-22  Nan Wang  &lt;n_wang@apple.com&gt;
+
+        AX: WebKit is returning the wrong rangeForLine
+        https://bugs.webkit.org/show_bug.cgi?id=169940
+
+        Reviewed by Chris Fleizach.
+
+        The AXRangeForLine is being calculated using VisiblePostition, so 
+        when we try to use the index we should validate it using VisiblePosition.
+
+        Changes are covered in the modified test.
+
+        * accessibility/AXObjectCache.cpp:
+        (WebCore::AXObjectCache::traverseToOffsetInRange):
+        (WebCore::AXObjectCache::characterOffsetForIndex):
+
</ins><span class="cx"> 2017-03-22  John Wilander  &lt;wilander@apple.com&gt;
</span><span class="cx"> 
</span><span class="cx">         Resource Load Statistics: Fix partitioning bug for client-side cookie access
</span></span></pre></div>
<a id="trunkSourceWebCoreaccessibilityAXObjectCachecpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/accessibility/AXObjectCache.cpp (214273 => 214274)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/accessibility/AXObjectCache.cpp        2017-03-22 20:30:11 UTC (rev 214273)
+++ trunk/Source/WebCore/accessibility/AXObjectCache.cpp        2017-03-22 20:30:41 UTC (rev 214274)
</span><span class="lines">@@ -1621,8 +1621,8 @@
</span><span class="cx">                     } else if (Element *shadowHost = currentNode-&gt;shadowHost()) {
</span><span class="cx">                         // Since we are entering text controls, we should set the currentNode
</span><span class="cx">                         // to be the shadow host when there's no content.
</span><del>-                        if (nodeIsTextControl(shadowHost)) {
-                            currentNode = currentNode-&gt;shadowHost();
</del><ins>+                        if (nodeIsTextControl(shadowHost) &amp;&amp; currentNode-&gt;isShadowRoot()) {
+                            currentNode = shadowHost;
</ins><span class="cx">                             continue;
</span><span class="cx">                         }
</span><span class="cx">                     } else if (currentNode != previousNode) {
</span><span class="lines">@@ -2621,11 +2621,28 @@
</span><span class="cx">     if (!obj)
</span><span class="cx">         return CharacterOffset();
</span><span class="cx">     
</span><ins>+    VisiblePosition vp = obj-&gt;visiblePositionForIndex(index);
+    CharacterOffset validate = characterOffsetFromVisiblePosition(vp);
+    // In text control, VisiblePosition always gives the before position of a
+    // BR node, while CharacterOffset will do the opposite.
+    if (obj-&gt;isTextControl() &amp;&amp; characterOffsetNodeIsBR(validate))
+        validate.offset = 1;
+    
</ins><span class="cx">     RefPtr&lt;Range&gt; range = obj-&gt;elementRange();
</span><span class="cx">     CharacterOffset start = startOrEndCharacterOffsetForRange(range, true, true);
</span><span class="cx">     CharacterOffset end = startOrEndCharacterOffsetForRange(range, false, true);
</span><span class="cx">     CharacterOffset result = start;
</span><span class="cx">     for (int i = 0; i &lt; index; i++) {
</span><ins>+        if (result.isEqual(validate)) {
+            // Do not include the new line character, always move the offset to the start of next node.
+            if ((validate.node-&gt;isTextNode() || characterOffsetNodeIsBR(validate))) {
+                CharacterOffset next = nextCharacterOffset(validate, false);
+                if (!next.offset &amp;&amp; rootAXEditableElement(next.node) == rootAXEditableElement(validate.node))
+                    result = next;
+            }
+            break;
+        }
+        
</ins><span class="cx">         result = nextCharacterOffset(result, false);
</span><span class="cx">         if (result.isEqual(end))
</span><span class="cx">             break;
</span></span></pre>
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