Make previousBoundary() not to use Range object

Source/core/editing/VisibleUnits.cpp

 /*
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 #include "config.h"
 #include "core/editing/VisibleUnits.h"
 
-#include "bindings/core/v8/ExceptionState.h"
-#include "bindings/core/v8/ExceptionStatePlaceholder.h"
 #include "core/HTMLNames.h"
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
 #include "core/dom/NodeTraversal.h"
 #include "core/dom/Text.h"
 #include "core/editing/EditingUtilities.h"
 #include "core/editing/FrameSelection.h"
 #include "core/editing/Position.h"
 #include "core/editing/PositionIterator.h"
 #include "core/editing/RenderedPosition.h"
@@ skipping 623 matching lines @@
 
 typedef unsigned (*BoundarySearchFunction)(const UChar*, unsigned length, unsigned offset, BoundarySearchContextAvailability, bool& needMoreContext);
 
 static VisiblePosition previousBoundary(const VisiblePosition& c, BoundarySearchFunction searchFunction)
 {
     Position pos = c.deepEquivalent();
     Node* boundary = parentEditingBoundary(pos);
     if (!boundary)
         return VisiblePosition();
 
-    Document& d = boundary->document();
     Position start = Position::editingPositionOf(boundary, 0).parentAnchoredEquivalent();
     Position end = pos.parentAnchoredEquivalent();
 
     Vector<UChar, 1024> string;
     unsigned suffixLength = 0;
 
-    TrackExceptionState exceptionState;
     if (requiresContextForWordBoundary(characterBefore(c))) {
-        RefPtrWillBeRawPtr<Range> forwardsScanRange(d.createRange());
-        forwardsScanRange->setEndAfter(boundary, exceptionState);
-        forwardsScanRange->setStart(end.anchorNode(), end.offsetInContainerNode(), exceptionState);
-        TextIterator forwardsIterator(forwardsScanRange->startPosition(), forwardsScanRange->endPosition());
+        TextIterator forwardsIterator(end, Position::afterNode(boundary));
         while (!forwardsIterator.atEnd()) {
             Vector<UChar, 1024> characters;
             forwardsIterator.text().appendTextTo(characters);
             int i = endOfFirstWordBoundaryContext(characters.data(), characters.size());
             string.append(characters.data(), i);
             suffixLength += i;
             if (static_cast<unsigned>(i) < characters.size())
                 break;
             forwardsIterator.advance();
         }
     }
 
-    ASSERT(!exceptionState.hadException());
-    if (exceptionState.hadException())
-        return VisiblePosition();
-
     SimplifiedBackwardsTextIterator it(start, end);
     unsigned next = 0;
     bool needMoreContext = false;
     while (!it.atEnd()) {
         bool inTextSecurityMode = it.node() && it.node()->layoutObject() && it.node()->layoutObject()->style()->textSecurity() != TSNONE;
         // iterate to get chunks until the searchFunction returns a non-zero value.
         if (!inTextSecurityMode) {
             it.prependTextTo(string);
         } else {
             // Treat bullets used in the text security mode as regular characters when looking for boundaries
@@ skipping 2255 matching lines @@
         return honorEditingBoundaryAtOrBefore(prev, visiblePosition.deepEquivalent());
     case CanSkipOverEditingBoundary:
         return skipToStartOfEditingBoundary(prev, visiblePosition.deepEquivalent());
     }
 
     ASSERT_NOT_REACHED();
     return honorEditingBoundaryAtOrBefore(prev, visiblePosition.deepEquivalent());
 }
 
 } // namespace blink