Bidi-Isolate inlines break layout with collapsed whitespace

Source/core/rendering/RenderBlockLineLayout.cpp

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All right reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 433 matching lines @@
 }
 
 // Adding a pair of midpoints before a character will split it out into a new line box.
 static inline void ensureCharacterGetsLineBox(LineMidpointState& lineMidpointState, InlineIterator& textParagraphSeparator)
 {
     InlineIterator midpoint(0, textParagraphSeparator.m_obj, textParagraphSeparator.m_pos);
     startIgnoringSpaces(lineMidpointState, InlineIterator(0, textParagraphSeparator.m_obj, textParagraphSeparator.m_pos - 1));
     stopIgnoringSpaces(lineMidpointState, InlineIterator(0, textParagraphSeparator.m_obj, textParagraphSeparator.m_pos));
 }
 
-static inline BidiRun* createRun(int start, int end, RenderObject* obj, InlineBidiResolver& resolver)
-{
-    return new BidiRun(start, end, obj, resolver.context(), resolver.dir());
-}
-
 void RenderBlockFlow::appendRunsForObject(BidiRunList<BidiRun>& runs, int start, int end, RenderObject* obj, InlineBidiResolver& resolver)
 {
-    if (start > end || shouldSkipCreatingRunsForObject(obj))
-        return;
-
-    LineMidpointState& lineMidpointState = resolver.midpointState();
-    bool haveNextMidpoint = (lineMidpointState.currentMidpoint < lineMidpointState.numMidpoints);
-    InlineIterator nextMidpoint;
-    if (haveNextMidpoint)
-        nextMidpoint = lineMidpointState.midpoints[lineMidpointState.currentMidpoint];
-    if (lineMidpointState.betweenMidpoints) {
-        if (!(haveNextMidpoint && nextMidpoint.m_obj == obj))
-            return;
-        // This is a new start point. Stop ignoring objects and
-        // adjust our start.
-        lineMidpointState.betweenMidpoints = false;
-        start = nextMidpoint.m_pos;
-        lineMidpointState.currentMidpoint++;
-        if (start < end)
-            return appendRunsForObject(runs, start, end, obj, resolver);
-    } else {
-        if (!haveNextMidpoint || (obj != nextMidpoint.m_obj)) {
-            runs.addRun(createRun(start, end, obj, resolver));
-            return;
-        }
-
-        // An end midpoint has been encountered within our object.  We
-        // need to go ahead and append a run with our endpoint.
-        if (static_cast<int>(nextMidpoint.m_pos + 1) <= end) {
-            lineMidpointState.betweenMidpoints = true;
-            lineMidpointState.currentMidpoint++;
-            if (nextMidpoint.m_pos != UINT_MAX) { // UINT_MAX means stop at the object and don't include any of it.
-                if (static_cast<int>(nextMidpoint.m_pos + 1) > start)
-                    runs.addRun(createRun(start, nextMidpoint.m_pos + 1, obj, resolver));
-                return appendRunsForObject(runs, nextMidpoint.m_pos + 1, end, obj, resolver);
-            }
-        } else
-           runs.addRun(createRun(start, end, obj, resolver));
-    }
+    adjustMidpointsAndAppendRunsForObjectIfNeeded(obj, start, end, resolver, AppendingRunsForObject, &runs);
 }
 
 static inline InlineBox* createInlineBoxForRenderer(RenderObject* obj, bool isRootLineBox, bool isOnlyRun = false)
 {
     if (isRootLineBox)
         return toRenderBlock(obj)->createAndAppendRootInlineBox();
 
     if (obj->isText()) {
         InlineTextBox* textBox = toRenderText(obj)->createInlineTextBox();
         // We only treat a box as text for a <br> if we are on a line by ourself or in strict mode
@@ skipping 744 matching lines @@
 
 static inline void setupResolverToResumeInIsolate(InlineBidiResolver& resolver, RenderObject* root, RenderObject* startObject)
 {
     if (root != startObject) {
         RenderObject* parent = startObject->parent();
         setupResolverToResumeInIsolate(resolver, root, parent);
         notifyObserverEnteredObject(&resolver, startObject);
     }
 }
 
+static void restoreIsolatedMidpointStates(InlineBidiResolver& topResolver, InlineBidiResolver& isolatedResolver)
+{
+    while (!isolatedResolver.isolatedRuns().isEmpty()) {
+        BidiRun* run = isolatedResolver.isolatedRuns().last();
+        isolatedResolver.isolatedRuns().removeLast();
+        topResolver.setMidpointStateForIsolatedRun(run, isolatedResolver.midpointStateForIsolatedRun(run));
+    }
+}
+
 // FIXME: BidiResolver should have this logic.
 static inline void constructBidiRunsForSegment(InlineBidiResolver& topResolver, BidiRunList<BidiRun>& bidiRuns, const InlineIterator& endOfRuns, VisualDirectionOverride override, bool previousLineBrokeCleanly, bool isNewUBAParagraph)
 {
     // FIXME: We should pass a BidiRunList into createBidiRunsForLine instead
     // of the resolver owning the runs.
     ASSERT(&topResolver.runs() == &bidiRuns);
     ASSERT(topResolver.position() != endOfRuns);
     RenderObject* currentRoot = topResolver.position().root();
     topResolver.createBidiRunsForLine(endOfRuns, override, previousLineBrokeCleanly);
 
     while (!topResolver.isolatedRuns().isEmpty()) {
         // It does not matter which order we resolve the runs as long as we resolve them all.
         BidiRun* isolatedRun = topResolver.isolatedRuns().last();
         topResolver.isolatedRuns().removeLast();
 
         RenderObject* startObj = isolatedRun->object();
 
         // Only inlines make sense with unicode-bidi: isolate (blocks are already isolated).
         // FIXME: Because enterIsolate is not passed a RenderObject, we have to crawl up the
         // tree to see which parent inline is the isolate. We could change enterIsolate
         // to take a RenderObject and do this logic there, but that would be a layering
         // violation for BidiResolver (which knows nothing about RenderObject).
         RenderInline* isolatedInline = toRenderInline(highestContainingIsolateWithinRoot(startObj, currentRoot));
         ASSERT(isolatedInline);
 
         InlineBidiResolver isolatedResolver;
+        LineMidpointState& isolatedLineMidpointState = isolatedResolver.midpointState();
+        isolatedLineMidpointState = topResolver.midpointStateForIsolatedRun(isolatedRun);
         EUnicodeBidi unicodeBidi = isolatedInline->style()->unicodeBidi();
         TextDirection direction = isolatedInline->style()->direction();
         if (unicodeBidi == Plaintext) {
             if (isNewUBAParagraph)
                 direction = determinePlaintextDirectionality(isolatedInline, startObj);
             else
                 direction = determinePlaintextDirectionality(isolatedInline);
         } else {
             ASSERT(unicodeBidi == Isolate || unicodeBidi == IsolateOverride);
             direction = isolatedInline->style()->direction();
@@ skipping 16 matching lines @@
         // We're not guaranteed to get any BidiRuns in the previous step. If we don't, we allow the placeholder
         // itself to be turned into an InlineBox. We can't remove it here without potentially losing track of
         // the logically last run.
         if (isolatedResolver.runs().runCount())
             bidiRuns.replaceRunWithRuns(isolatedRun, isolatedResolver.runs());
 
         // If we encountered any nested isolate runs, just move them
         // to the top resolver's list for later processing.
         if (!isolatedResolver.isolatedRuns().isEmpty()) {
             topResolver.isolatedRuns().append(isolatedResolver.isolatedRuns());
-            isolatedResolver.isolatedRuns().clear();
             currentRoot = isolatedInline;
+            restoreIsolatedMidpointStates(topResolver, isolatedResolver);
         }
     }
 }
 
 static inline bool segmentIsEmpty(const InlineIterator& segmentStart, const InlineIterator& segmentEnd)
 {
     return segmentStart == segmentEnd;
 }
 
 static inline void constructBidiRunsForLine(const RenderBlockFlow* block, InlineBidiResolver& topResolver, BidiRunList<BidiRun>& bidiRuns, const InlineIterator& endOfLine, VisualDirectionOverride override, bool previousLineBrokeCleanly, bool isNewUBAParagraph)
@@ skipping 2212 matching lines @@
     lineGridBox->alignBoxesInBlockDirection(logicalHeight(), textBoxDataMap, verticalPositionCache);
 
     setLineGridBox(lineGridBox);
 
     // FIXME: If any of the characteristics of the box change compared to the old one, then we need to do a deep dirtying
     // (similar to what happens when the page height changes). Ideally, though, we only do this if someone is actually snapping
     // to this grid.
 }
 
 }