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      1 /*
      2  * Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "HTMLNames.h"
     28 #include "bindings/v8/ExceptionStatePlaceholder.h"
     29 #include "core/dom/Document.h"
     30 #include "core/dom/Element.h"
     31 #include "core/dom/Range.h"
     32 #include "core/editing/FormatBlockCommand.h"
     33 #include "core/editing/VisibleUnits.h"
     34 #include "core/editing/htmlediting.h"
     35 #include "core/html/HTMLElement.h"
     36 
     37 namespace WebCore {
     38 
     39 using namespace HTMLNames;
     40 
     41 static Node* enclosingBlockToSplitTreeTo(Node* startNode);
     42 static bool isElementForFormatBlock(const QualifiedName& tagName);
     43 static inline bool isElementForFormatBlock(Node* node)
     44 {
     45     return node->isElementNode() && isElementForFormatBlock(toElement(node)->tagQName());
     46 }
     47 
     48 FormatBlockCommand::FormatBlockCommand(Document& document, const QualifiedName& tagName)
     49     : ApplyBlockElementCommand(document, tagName)
     50     , m_didApply(false)
     51 {
     52 }
     53 
     54 void FormatBlockCommand::formatSelection(const VisiblePosition& startOfSelection, const VisiblePosition& endOfSelection)
     55 {
     56     if (!isElementForFormatBlock(tagName()))
     57         return;
     58     ApplyBlockElementCommand::formatSelection(startOfSelection, endOfSelection);
     59     m_didApply = true;
     60 }
     61 
     62 void FormatBlockCommand::formatRange(const Position& start, const Position& end, const Position& endOfSelection, RefPtr<Element>& blockNode)
     63 {
     64     Element* refNode = enclosingBlockFlowElement(end);
     65     Element* root = editableRootForPosition(start);
     66     // Root is null for elements with contenteditable=false.
     67     if (!root || !refNode)
     68         return;
     69 
     70     Node* nodeToSplitTo = enclosingBlockToSplitTreeTo(start.deprecatedNode());
     71     RefPtr<Node> outerBlock = (start.deprecatedNode() == nodeToSplitTo) ? start.deprecatedNode() : splitTreeToNode(start.deprecatedNode(), nodeToSplitTo);
     72     RefPtr<Node> nodeAfterInsertionPosition = outerBlock;
     73     RefPtr<Range> range = Range::create(document(), start, endOfSelection);
     74 
     75     if (isElementForFormatBlock(refNode->tagQName()) && start == startOfBlock(start)
     76         && (end == endOfBlock(end) || isNodeVisiblyContainedWithin(refNode, range.get()))
     77         && refNode != root && !root->isDescendantOf(refNode)) {
     78         // Already in a block element that only contains the current paragraph
     79         if (refNode->hasTagName(tagName()))
     80             return;
     81         nodeAfterInsertionPosition = refNode;
     82     }
     83 
     84     if (!blockNode) {
     85         // Create a new blockquote and insert it as a child of the root editable element. We accomplish
     86         // this by splitting all parents of the current paragraph up to that point.
     87         blockNode = createBlockElement();
     88         insertNodeBefore(blockNode, nodeAfterInsertionPosition);
     89     }
     90 
     91     Position lastParagraphInBlockNode = blockNode->lastChild() ? positionAfterNode(blockNode->lastChild()) : Position();
     92     bool wasEndOfParagraph = isEndOfParagraph(lastParagraphInBlockNode);
     93 
     94     moveParagraphWithClones(start, end, blockNode.get(), outerBlock.get());
     95 
     96     // Copy the inline style of the original block element to the newly created block-style element.
     97     if (outerBlock.get() != nodeAfterInsertionPosition.get() && toHTMLElement(nodeAfterInsertionPosition.get())->hasAttribute(styleAttr))
     98         blockNode->setAttribute(styleAttr, toHTMLElement(nodeAfterInsertionPosition.get())->getAttribute(styleAttr));
     99 
    100     if (wasEndOfParagraph && !isEndOfParagraph(lastParagraphInBlockNode) && !isStartOfParagraph(lastParagraphInBlockNode))
    101         insertBlockPlaceholder(lastParagraphInBlockNode);
    102 }
    103 
    104 Element* FormatBlockCommand::elementForFormatBlockCommand(Range* range)
    105 {
    106     if (!range)
    107         return 0;
    108 
    109     Node* commonAncestor = range->commonAncestorContainer(IGNORE_EXCEPTION);
    110     while (commonAncestor && !isElementForFormatBlock(commonAncestor))
    111         commonAncestor = commonAncestor->parentNode();
    112 
    113     if (!commonAncestor)
    114         return 0;
    115 
    116     Element* rootEditableElement = range->startContainer()->rootEditableElement();
    117     if (!rootEditableElement || commonAncestor->contains(rootEditableElement))
    118         return 0;
    119 
    120     return commonAncestor->isElementNode() ? toElement(commonAncestor) : 0;
    121 }
    122 
    123 bool isElementForFormatBlock(const QualifiedName& tagName)
    124 {
    125     DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, blockTags, ());
    126     if (blockTags.isEmpty()) {
    127         blockTags.add(addressTag);
    128         blockTags.add(articleTag);
    129         blockTags.add(asideTag);
    130         blockTags.add(blockquoteTag);
    131         blockTags.add(ddTag);
    132         blockTags.add(divTag);
    133         blockTags.add(dlTag);
    134         blockTags.add(dtTag);
    135         blockTags.add(footerTag);
    136         blockTags.add(h1Tag);
    137         blockTags.add(h2Tag);
    138         blockTags.add(h3Tag);
    139         blockTags.add(h4Tag);
    140         blockTags.add(h5Tag);
    141         blockTags.add(h6Tag);
    142         blockTags.add(headerTag);
    143         blockTags.add(hgroupTag);
    144         blockTags.add(mainTag);
    145         blockTags.add(navTag);
    146         blockTags.add(pTag);
    147         blockTags.add(preTag);
    148         blockTags.add(sectionTag);
    149     }
    150     return blockTags.contains(tagName);
    151 }
    152 
    153 Node* enclosingBlockToSplitTreeTo(Node* startNode)
    154 {
    155     Node* lastBlock = startNode;
    156     for (Node* n = startNode; n; n = n->parentNode()) {
    157         if (!n->rendererIsEditable())
    158             return lastBlock;
    159         if (isTableCell(n) || n->hasTagName(bodyTag) || !n->parentNode() || !n->parentNode()->rendererIsEditable() || isElementForFormatBlock(n))
    160             return n;
    161         if (isBlock(n))
    162             lastBlock = n;
    163         if (isListElement(n))
    164             return n->parentNode()->rendererIsEditable() ? n->parentNode() : n;
    165     }
    166     return lastBlock;
    167 }
    168 
    169 }
    170