compositeeditcommand.cpp

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
 * Copyright (C) 2005, 2006, 2007, 2008 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 "CompositeEditCommand.h"

#include "AppendNodeCommand.h"
#include "ApplyStyleCommand.h"
#include "CSSComputedStyleDeclaration.h"
#include "CSSMutableStyleDeclaration.h"
#include "CharacterNames.h"
#include "DeleteFromTextNodeCommand.h"
#include "DeleteSelectionCommand.h"
#include "Document.h"
#include "DocumentFragment.h"
#include "EditorInsertAction.h"
#include "Element.h"
#include "HTMLNames.h"
#include "InlineTextBox.h"
#include "InsertIntoTextNodeCommand.h"
#include "InsertLineBreakCommand.h"
#include "InsertNodeBeforeCommand.h"
#include "InsertParagraphSeparatorCommand.h"
#include "InsertTextCommand.h"
#include "JoinTextNodesCommand.h"
#include "MergeIdenticalElementsCommand.h"
#include "Range.h"
#include "RemoveCSSPropertyCommand.h"
#include "RemoveNodeCommand.h"
#include "RemoveNodePreservingChildrenCommand.h"
#include "ReplaceSelectionCommand.h"
#include "RenderBlock.h"
#include "RenderText.h"
#include "SetNodeAttributeCommand.h"
#include "SplitElementCommand.h"
#include "SplitTextNodeCommand.h"
#include "SplitTextNodeContainingElementCommand.h"
#include "Text.h"
#include "TextIterator.h"
#include "WrapContentsInDummySpanCommand.h"
#include "htmlediting.h"
#include "markup.h"
#include "visible_units.h"

using namespace std;

namespace WebCore {

using namespace HTMLNames;

CompositeEditCommand::CompositeEditCommand(Document *document) 
    : EditCommand(document)
{
}

void CompositeEditCommand::doUnapply()
{
    size_t size = m_commands.size();
    for (size_t i = size; i != 0; --i)
        m_commands[i - 1]->unapply();
}

void CompositeEditCommand::doReapply()
{
    size_t size = m_commands.size();
    for (size_t i = 0; i != size; ++i)
        m_commands[i]->reapply();
}

//
// sugary-sweet convenience functions to help create and apply edit commands in composite commands
//
void CompositeEditCommand::applyCommandToComposite(PassRefPtr<EditCommand> cmd)
{
    cmd->setParent(this);
    cmd->apply();
    m_commands.append(cmd);
}

void CompositeEditCommand::applyStyle(CSSStyleDeclaration* style, EditAction editingAction)
{
    applyCommandToComposite(ApplyStyleCommand::create(document(), style, editingAction));
}

void CompositeEditCommand::applyStyle(CSSStyleDeclaration* style, const Position& start, const Position& end, EditAction editingAction)
{
    applyCommandToComposite(ApplyStyleCommand::create(document(), style, start, end, editingAction));
}

void CompositeEditCommand::applyStyledElement(PassRefPtr<Element> element)
{
    applyCommandToComposite(ApplyStyleCommand::create(element, false));
}

void CompositeEditCommand::removeStyledElement(PassRefPtr<Element> element)
{
    applyCommandToComposite(ApplyStyleCommand::create(element, true));
}

void CompositeEditCommand::insertParagraphSeparator(bool useDefaultParagraphElement)
{
    applyCommandToComposite(InsertParagraphSeparatorCommand::create(document(), useDefaultParagraphElement));
}

void CompositeEditCommand::insertLineBreak()
{
    applyCommandToComposite(InsertLineBreakCommand::create(document()));
}

void CompositeEditCommand::insertNodeBefore(PassRefPtr<Node> insertChild, PassRefPtr<Node> refChild)
{
    ASSERT(!refChild->hasTagName(bodyTag));
    applyCommandToComposite(InsertNodeBeforeCommand::create(insertChild, refChild));
}

void CompositeEditCommand::insertNodeAfter(PassRefPtr<Node> insertChild, PassRefPtr<Node> refChild)
{
    ASSERT(insertChild);
    ASSERT(refChild);
    ASSERT(!refChild->hasTagName(bodyTag));
    Element* parent = refChild->parentElement();
    ASSERT(parent);
    if (parent->lastChild() == refChild)
        appendNode(insertChild, parent);
    else {
        ASSERT(refChild->nextSibling());
        insertNodeBefore(insertChild, refChild->nextSibling());
    }
}

void CompositeEditCommand::insertNodeAt(PassRefPtr<Node> insertChild, const Position& editingPosition)
{
    ASSERT(isEditablePosition(editingPosition));
    // For editing positions like [table, 0], insert before the table,
    // likewise for replaced elements, brs, etc.
    Position p = rangeCompliantEquivalent(editingPosition);
    Node* refChild = p.node();
    int offset = p.offset();
    
    if (canHaveChildrenForEditing(refChild)) {
        Node* child = refChild->firstChild();
        for (int i = 0; child && i < offset; i++)
            child = child->nextSibling();
        if (child)
            insertNodeBefore(insertChild, child);
        else
            appendNode(insertChild, static_cast<Element*>(refChild));
    } else if (caretMinOffset(refChild) >= offset)
        insertNodeBefore(insertChild, refChild);
    else if (refChild->isTextNode() && caretMaxOffset(refChild) > offset) {
        splitTextNode(static_cast<Text *>(refChild), offset);
        insertNodeBefore(insertChild, refChild);
    } else
        insertNodeAfter(insertChild, refChild);
}

void CompositeEditCommand::appendNode(PassRefPtr<Node> node, PassRefPtr<Element> parent)
{
    ASSERT(canHaveChildrenForEditing(parent.get()));
    applyCommandToComposite(AppendNodeCommand::create(parent, node));
}

void CompositeEditCommand::removeChildrenInRange(PassRefPtr<Node> node, unsigned from, unsigned to)
{
    Vector<RefPtr<Node> > children;
    Node* child = node->childNode(from);
    for (unsigned i = from; child && i < to; i++, child = child->nextSibling())
        children.append(child);

    size_t size = children.size();
    for (size_t i = 0; i < size; ++i)
        removeNode(children[i].release());
}

void CompositeEditCommand::removeNode(PassRefPtr<Node> node)
{
    applyCommandToComposite(RemoveNodeCommand::create(node));
}

void CompositeEditCommand::removeNodePreservingChildren(PassRefPtr<Node> node)
{
    applyCommandToComposite(RemoveNodePreservingChildrenCommand::create(node));
}

void CompositeEditCommand::removeNodeAndPruneAncestors(PassRefPtr<Node> node)
{
    RefPtr<Node> parent = node->parentNode();
    removeNode(node);
    prune(parent.release());
}

static bool hasARenderedDescendant(Node* node)
{
    Node* n = node->firstChild();
    while (n) {
        if (n->renderer())
            return true;
        n = n->traverseNextNode(node);
    }
    return false;
}

void CompositeEditCommand::prune(PassRefPtr<Node> node)
{
    while (node) {
        // If you change this rule you may have to add an updateLayout() here.
        RenderObject* renderer = node->renderer();
        if (renderer && (!renderer->canHaveChildren() || hasARenderedDescendant(node.get()) || node->rootEditableElement() == node))
            return;
            
        RefPtr<Node> next = node->parentNode();
        removeNode(node);
        node = next;
    }
}

void CompositeEditCommand::splitTextNode(PassRefPtr<Text> node, unsigned offset)
{
    applyCommandToComposite(SplitTextNodeCommand::create(node, offset));
}

void CompositeEditCommand::splitElement(PassRefPtr<Element> element, PassRefPtr<Node> atChild)
{
    applyCommandToComposite(SplitElementCommand::create(element, atChild));
}

void CompositeEditCommand::mergeIdenticalElements(PassRefPtr<Element> prpFirst, PassRefPtr<Element> prpSecond)
{
    RefPtr<Element> first = prpFirst;
    RefPtr<Element> second = prpSecond;
    ASSERT(!first->isDescendantOf(second.get()) && second != first);
    if (first->nextSibling() != second) {
        removeNode(second);
        insertNodeAfter(second, first);
    }
    applyCommandToComposite(MergeIdenticalElementsCommand::create(first, second));
}

void CompositeEditCommand::wrapContentsInDummySpan(PassRefPtr<Element> element)
{
    applyCommandToComposite(WrapContentsInDummySpanCommand::create(element));
}

void CompositeEditCommand::splitTextNodeContainingElement(PassRefPtr<Text> text, unsigned offset)
{
    applyCommandToComposite(SplitTextNodeContainingElementCommand::create(text, offset));
}

void CompositeEditCommand::joinTextNodes(PassRefPtr<Text> text1, PassRefPtr<Text> text2)
{
    applyCommandToComposite(JoinTextNodesCommand::create(text1, text2));
}

void CompositeEditCommand::inputText(const String& text, bool selectInsertedText)
{
    int offset = 0;
    int length = text.length();
    RefPtr<Range> startRange = Range::create(document(), Position(document()->documentElement(), 0), endingSelection().start());
    int startIndex = TextIterator::rangeLength(startRange.get());
    int newline;
    do {
        newline = text.find('\n', offset);
        if (newline != offset) {
            RefPtr<InsertTextCommand> command = InsertTextCommand::create(document());
            applyCommandToComposite(command);
            int substringLength = newline == -1 ? length - offset : newline - offset;
            command->input(text.substring(offset, substringLength), false);
        }
        if (newline != -1)
            insertLineBreak();
            
        offset = newline + 1;
    } while (newline != -1 && offset != length);
    
    if (selectInsertedText) {
        RefPtr<Range> selectedRange = TextIterator::rangeFromLocationAndLength(document()->documentElement(), startIndex, length);
        setEndingSelection(VisibleSelection(selectedRange.get()));
    }
}

void CompositeEditCommand::insertTextIntoNode(PassRefPtr<Text> node, unsigned offset, const String& text)
{
    applyCommandToComposite(InsertIntoTextNodeCommand::create(node, offset, text));
}

void CompositeEditCommand::deleteTextFromNode(PassRefPtr<Text> node, unsigned offset, unsigned count)
{
    applyCommandToComposite(DeleteFromTextNodeCommand::create(node, offset, count));
}

void CompositeEditCommand::replaceTextInNode(PassRefPtr<Text> node, unsigned offset, unsigned count, const String& replacementText)
{
    applyCommandToComposite(DeleteFromTextNodeCommand::create(node.get(), offset, count));
    applyCommandToComposite(InsertIntoTextNodeCommand::create(node, offset, replacementText));
}

Position CompositeEditCommand::positionOutsideTabSpan(const Position& pos)
{
    if (!isTabSpanTextNode(pos.node()))
        return pos;
    
    Node* tabSpan = tabSpanNode(pos.node());
    
    if (pos.offset() <= caretMinOffset(pos.node()))
        return positionBeforeNode(tabSpan);
        
    if (pos.offset() >= caretMaxOffset(pos.node()))
        return positionAfterNode(tabSpan);

    splitTextNodeContainingElement(static_cast<Text *>(pos.node()), pos.offset());
    return positionBeforeNode(tabSpan);
}

void CompositeEditCommand::insertNodeAtTabSpanPosition(PassRefPtr<Node> node, const Position& pos)
{
    // insert node before, after, or at split of tab span
    insertNodeAt(node, positionOutsideTabSpan(pos));
}

void CompositeEditCommand::deleteSelection(bool smartDelete, bool mergeBlocksAfterDelete, bool replace, bool expandForSpecialElements)
{
    if (endingSelection().isRange())
        applyCommandToComposite(DeleteSelectionCommand::create(document(), smartDelete, mergeBlocksAfterDelete, replace, expandForSpecialElements));
}