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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 "Element.h"
     28 #include "FormatBlockCommand.h"
     29 #include "Document.h"
     30 #include "htmlediting.h"
     31 #include "HTMLElement.h"
     32 #include "HTMLNames.h"
     33 #include "Range.h"
     34 #include "visible_units.h"
     35 
     36 namespace WebCore {
     37 
     38 using namespace HTMLNames;
     39 
     40 static Node* enclosingBlockToSplitTreeTo(Node* startNode);
     41 static bool isElementForFormatBlock(const QualifiedName& tagName);
     42 static inline bool isElementForFormatBlock(Node* node)
     43 {
     44     return node->isElementNode() && isElementForFormatBlock(static_cast<Element*>(node)->tagQName());
     45 }
     46 
     47 FormatBlockCommand::FormatBlockCommand(Document* document, const QualifiedName& tagName)
     48     : ApplyBlockElementCommand(document, tagName)
     49     , m_didApply(false)
     50 {
     51 }
     52 
     53 void FormatBlockCommand::formatSelection(const VisiblePosition& startOfSelection, const VisiblePosition& endOfSelection)
     54 {
     55     if (!isElementForFormatBlock(tagName()))
     56         return;
     57     ApplyBlockElementCommand::formatSelection(startOfSelection, endOfSelection);
     58     m_didApply = true;
     59 }
     60 
     61 void FormatBlockCommand::formatRange(const Position& start, const Position& end, const Position& endOfSelection, RefPtr<Element>& blockNode)
     62 {
     63     Node* nodeToSplitTo = enclosingBlockToSplitTreeTo(start.deprecatedNode());
     64     RefPtr<Node> outerBlock = (start.deprecatedNode() == nodeToSplitTo) ? start.deprecatedNode() : splitTreeToNode(start.deprecatedNode(), nodeToSplitTo);
     65     RefPtr<Node> nodeAfterInsertionPosition = outerBlock;
     66 
     67     RefPtr<Range> range = Range::create(document(), start, endOfSelection);
     68     Element* refNode = enclosingBlockFlowElement(end);
     69     Element* root = editableRootForPosition(start);
     70     // Root is null for elements with contenteditable=false.
     71     if (!root)
     72         return;
     73     if (isElementForFormatBlock(refNode->tagQName()) && start == startOfBlock(start)
     74         && (end == endOfBlock(end) || isNodeVisiblyContainedWithin(refNode, range.get()))
     75         && refNode != root && !root->isDescendantOf(refNode)) {
     76         // Already in a block element that only contains the current paragraph
     77         if (refNode->hasTagName(tagName()))
     78             return;
     79         nodeAfterInsertionPosition = refNode;
     80     }
     81 
     82     if (!blockNode) {
     83         // Create a new blockquote and insert it as a child of the root editable element. We accomplish
     84         // this by splitting all parents of the current paragraph up to that point.
     85         blockNode = createBlockElement();
     86         insertNodeBefore(blockNode, nodeAfterInsertionPosition);
     87     }
     88 
     89     Position lastParagraphInBlockNode = lastPositionInNode(blockNode.get());
     90     bool wasEndOfParagraph = isEndOfParagraph(lastParagraphInBlockNode);
     91 
     92     moveParagraphWithClones(start, end, blockNode.get(), outerBlock.get());
     93 
     94     if (wasEndOfParagraph && !isEndOfParagraph(lastParagraphInBlockNode) && !isStartOfParagraph(lastParagraphInBlockNode))
     95         insertBlockPlaceholder(lastParagraphInBlockNode);
     96 }
     97 
     98 Element* FormatBlockCommand::elementForFormatBlockCommand(Range* range)
     99 {
    100     if (!range)
    101         return 0;
    102 
    103     ExceptionCode ec;
    104     Node* commonAncestor = range->commonAncestorContainer(ec);
    105     while (commonAncestor && !isElementForFormatBlock(commonAncestor))
    106         commonAncestor = commonAncestor->parentNode();
    107 
    108     if (!commonAncestor)
    109         return 0;
    110 
    111     Element* rootEditableElement = range->startContainer()->rootEditableElement();
    112     if (!rootEditableElement || commonAncestor->contains(rootEditableElement))
    113         return 0;
    114 
    115     return commonAncestor->isElementNode() ? toElement(commonAncestor) : 0;
    116 }
    117 
    118 bool isElementForFormatBlock(const QualifiedName& tagName)
    119 {
    120     DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, blockTags, ());
    121     if (blockTags.isEmpty()) {
    122         blockTags.add(addressTag);
    123         blockTags.add(articleTag);
    124         blockTags.add(asideTag);
    125         blockTags.add(blockquoteTag);
    126         blockTags.add(ddTag);
    127         blockTags.add(divTag);
    128         blockTags.add(dlTag);
    129         blockTags.add(dtTag);
    130         blockTags.add(footerTag);
    131         blockTags.add(h1Tag);
    132         blockTags.add(h2Tag);
    133         blockTags.add(h3Tag);
    134         blockTags.add(h4Tag);
    135         blockTags.add(h5Tag);
    136         blockTags.add(h6Tag);
    137         blockTags.add(headerTag);
    138         blockTags.add(hgroupTag);
    139         blockTags.add(navTag);
    140         blockTags.add(pTag);
    141         blockTags.add(preTag);
    142         blockTags.add(sectionTag);
    143     }
    144     return blockTags.contains(tagName);
    145 }
    146 
    147 Node* enclosingBlockToSplitTreeTo(Node* startNode)
    148 {
    149     Node* lastBlock = startNode;
    150     for (Node* n = startNode; n; n = n->parentNode()) {
    151         if (!n->rendererIsEditable())
    152             return lastBlock;
    153         if (isTableCell(n) || n->hasTagName(bodyTag) || !n->parentNode() || !n->parentNode()->rendererIsEditable() || isElementForFormatBlock(n))
    154             return n;
    155         if (isBlock(n))
    156             lastBlock = n;
    157         if (isListElement(n))
    158             return n->parentNode()->rendererIsEditable() ? n->parentNode() : n;
    159     }
    160     return lastBlock;
    161 }
    162 
    163 }
    164