Move isVisuallyEquivalentCandidate() to VisibleUnits.{cpp,h} from Position.{cpp,h}

Source/core/editing/Position.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/editing/Position.h"
 
-#include "core/HTMLNames.h"
-#include "core/css/CSSComputedStyleDeclaration.h"
-#include "core/dom/Text.h"
 #include "core/dom/shadow/ElementShadow.h"
 #include "core/editing/EditingUtilities.h"
 #include "core/editing/PositionIterator.h"
 #include "core/editing/TextAffinity.h"
-#include "core/editing/VisiblePosition.h"
 #include "core/editing/VisibleUnits.h"
-#include "core/editing/iterators/TextIterator.h"
-#include "core/frame/LocalFrame.h"
-#include "core/frame/Settings.h"
-#include "core/html/HTMLTableElement.h"
 #include "core/layout/LayoutBlock.h"
 #include "core/layout/LayoutInline.h"
 #include "core/layout/LayoutText.h"
 #include "core/layout/line/InlineTextBox.h"
 #include "wtf/text/CString.h"
 #include <stdio.h>
 
 namespace blink {
 
-using namespace HTMLNames;
-
 #if ENABLE(ASSERT)
 static bool canBeAnchorNode(Node* node)
 {
     if (!node || node->isFirstLetterPseudoElement())
         return true;
     return !node->isPseudoElement();
 }
 #endif
 
 template <typename Strategy>
@@ skipping 368 matching lines @@
     if (isNull())
         return true;
     // TODO(yosin): Position after anchor shouldn't be considered as at the
     // first editing position for node since that position resides outside of
     // the node.
     // TODO(yosin) We should use |Strategy::lastOffsetForEditing()| instead of
     // DOM tree version.
     return isAfterAnchorOrAfterChildren() || m_offset >= EditingStrategy::lastOffsetForEditing(anchorNode());
 }
 
-// Returns true if the visually equivalent positions around have different
-// editability. A position is considered at editing boundary if one of the
-// following is true:
-// 1. It is the first position in the node and the next visually equivalent
-//    position is non editable.
-// 2. It is the last position in the node and the previous visually equivalent
-//    position is non editable.
-// 3. It is an editable position and both the next and previous visually
-//    equivalent positions are both non editable.
-template <typename Strategy>
-static bool atEditingBoundary(const PositionAlgorithm<Strategy> positions)
-{
-    PositionAlgorithm<Strategy> nextPosition = positions.downstream(CanCrossEditingBoundary);
-    if (positions.atFirstEditingPositionForNode() && nextPosition.isNotNull() && !nextPosition.anchorNode()->hasEditableStyle())
-        return true;
-
-    PositionAlgorithm<Strategy> prevPosition = positions.upstream(CanCrossEditingBoundary);
-    if (positions.atLastEditingPositionForNode() && prevPosition.isNotNull() && !prevPosition.anchorNode()->hasEditableStyle())
-        return true;
-
-    return nextPosition.isNotNull() && !nextPosition.anchorNode()->hasEditableStyle()
-        && prevPosition.isNotNull() && !prevPosition.anchorNode()->hasEditableStyle();
-}
-
 template <typename Strategy>
 bool PositionAlgorithm<Strategy>::atStartOfTree() const
 {
     if (isNull())
         return true;
     return !Strategy::parent(*anchorNode()) && m_offset == 0;
 }
 
 template <typename Strategy>
 bool PositionAlgorithm<Strategy>::atEndOfTree() const
@@ skipping 10 matching lines @@
 {
     return mostForwardCaretPosition(*this, rule);
 }
 
 template <typename Strategy>
 PositionAlgorithm<Strategy> PositionAlgorithm<Strategy>::downstream(EditingBoundaryCrossingRule rule) const
 {
     return mostBackwardCaretPosition(*this, rule);
 }
 
-// TODO(yosin) We should move |isVisuallyEquivalentCandidate()| to
-// "VisibleUnits.cpp" to reduce |LayoutObject| dependency in "Position.cpp".
-template <typename Strategy>
-static bool isVisuallyEquivalentCandidateAlgorithm(const PositionAlgorithm<Strategy>& position)
-{
-    Node* const anchorNode = position.anchorNode();
-    if (!anchorNode)
-        return false;
-
-    LayoutObject* layoutObject = anchorNode->layoutObject();
-    if (!layoutObject)
-        return false;
-
-    if (layoutObject->style()->visibility() != VISIBLE)
-        return false;
-
-    if (layoutObject->isBR()) {
-        // TODO(leviw) The condition should be
-        // m_anchorType == PositionAnchorType::BeforeAnchor, but for now we
-        // still need to support legacy positions.
-        if (position.isAfterAnchor())
-            return false;
-        return !position.computeEditingOffset() && !nodeIsUserSelectNone(Strategy::parent(*anchorNode));
-    }
-
-    if (layoutObject->isText())
-        return !nodeIsUserSelectNone(anchorNode) && inRenderedText(position);
-
-    if (layoutObject->isSVG()) {
-        // We don't consider SVG elements are contenteditable except for
-        // associated |layoutObject| returns |isText()| true,
-        // e.g. |LayoutSVGInlineText|.
-        return false;
-    }
-
-    if (isRenderedHTMLTableElement(anchorNode) || Strategy::editingIgnoresContent(anchorNode))
-        return (position.atFirstEditingPositionForNode() || position.atLastEditingPositionForNode()) && !nodeIsUserSelectNone(Strategy::parent(*anchorNode));
-
-    if (isHTMLHtmlElement(*anchorNode))
-        return false;
-
-    if (layoutObject->isLayoutBlockFlow() || layoutObject->isFlexibleBox() || layoutObject->isLayoutGrid()) {
-        if (toLayoutBlock(layoutObject)->logicalHeight() || isHTMLBodyElement(*anchorNode)) {
-            if (!hasRenderedNonAnonymousDescendantsWithHeight(layoutObject))
-                return position.atFirstEditingPositionForNode() && !nodeIsUserSelectNone(anchorNode);
-            return anchorNode->hasEditableStyle() && !nodeIsUserSelectNone(anchorNode) && atEditingBoundary(position);
-        }
-    } else {
-        LocalFrame* frame = anchorNode->document().frame();
-        bool caretBrowsing = frame->settings() && frame->settings()->caretBrowsingEnabled();
-        return (caretBrowsing || anchorNode->hasEditableStyle()) && !nodeIsUserSelectNone(anchorNode) && atEditingBoundary(position);
-    }
-
-    return false;
-}
-
-// TODO(yosin) We should move |inRenderedText()| to "VisibleUnits.h" for
-// reduce dependency of |LayoutObject| in |Position| class.
-bool isVisuallyEquivalentCandidate(const Position& position)
-{
-    return isVisuallyEquivalentCandidateAlgorithm<EditingStrategy>(position);
-}
-
-bool isVisuallyEquivalentCandidate(const PositionInComposedTree& position)
-{
-    return isVisuallyEquivalentCandidateAlgorithm<EditingInComposedTreeStrategy>(position);
-}
-
 template <typename Strategy>
 static bool inRenderedTextAlgorithm(const PositionAlgorithm<Strategy>& position)
 {
     Node* const anchorNode = position.anchorNode();
     if (!anchorNode || !anchorNode->isTextNode())
         return false;
 
     LayoutObject* layoutObject = anchorNode->layoutObject();
     if (!layoutObject)
         return false;
@@ skipping 452 matching lines @@
 
 void showTree(const blink::Position* pos)
 {
     if (pos)
         pos->showTreeForThis();
     else
         fprintf(stderr, "Cannot showTree for (nil)\n");
 }
 
 #endif