replaceselectioncommand.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, 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 "ReplaceSelectionCommand.h"

#include "ApplyStyleCommand.h"
#include "BeforeTextInsertedEvent.h"
#include "BreakBlockquoteCommand.h" 
#include "CSSComputedStyleDeclaration.h"
#include "CSSProperty.h"
#include "CSSPropertyNames.h"
#include "CSSValueKeywords.h"
#include "Document.h"
#include "DocumentFragment.h"
#include "EditingText.h"
#include "EventNames.h"
#include "Element.h"
#include "Frame.h"
#include "HTMLElement.h"
#include "HTMLInterchange.h"
#include "HTMLInputElement.h"
#include "HTMLNames.h"
#include "SelectionController.h"
#include "SmartReplace.h"
#include "TextIterator.h"
#include "htmlediting.h"
#include "markup.h"
#include "visible_units.h"
#include <wtf/StdLibExtras.h>

namespace WebCore {

using namespace HTMLNames;

enum EFragmentType { EmptyFragment, SingleTextNodeFragment, TreeFragment };

// --- ReplacementFragment helper class

class ReplacementFragment : Noncopyable {
public:
    ReplacementFragment(Document*, DocumentFragment*, bool matchStyle, const VisibleSelection&);

    Node* firstChild() const;
    Node* lastChild() const;

    bool isEmpty() const;
    
    bool hasInterchangeNewlineAtStart() const { return m_hasInterchangeNewlineAtStart; }
    bool hasInterchangeNewlineAtEnd() const { return m_hasInterchangeNewlineAtEnd; }
    
    void removeNode(PassRefPtr<Node>);
    void removeNodePreservingChildren(Node*);

private:
    PassRefPtr<Node> insertFragmentForTestRendering(Node* context);
    void removeUnrenderedNodes(Node*);
    void restoreTestRenderingNodesToFragment(Node*);
    void removeInterchangeNodes(Node*);
    
    void insertNodeBefore(PassRefPtr<Node> node, Node* refNode);

    RefPtr<Document> m_document;
    RefPtr<DocumentFragment> m_fragment;
    bool m_matchStyle;
    bool m_hasInterchangeNewlineAtStart;
    bool m_hasInterchangeNewlineAtEnd;
};

static bool isInterchangeNewlineNode(const Node *node)
{
    DEFINE_STATIC_LOCAL(String, interchangeNewlineClassString, (AppleInterchangeNewline));
    return node && node->hasTagName(brTag) && 
           static_cast<const Element *>(node)->getAttribute(classAttr) == interchangeNewlineClassString;
}

static bool isInterchangeConvertedSpaceSpan(const Node *node)
{
    DEFINE_STATIC_LOCAL(String, convertedSpaceSpanClassString, (AppleConvertedSpace));
    return node->isHTMLElement() && 
           static_cast<const HTMLElement *>(node)->getAttribute(classAttr) == convertedSpaceSpanClassString;
}

ReplacementFragment::ReplacementFragment(Document* document, DocumentFragment* fragment, bool matchStyle, const VisibleSelection& selection)
    : m_document(document),
      m_fragment(fragment),
      m_matchStyle(matchStyle), 
      m_hasInterchangeNewlineAtStart(false), 
      m_hasInterchangeNewlineAtEnd(false)
{
    if (!m_document)
        return;
    if (!m_fragment)
        return;
    if (!m_fragment->firstChild())
        return;
    
    Element* editableRoot = selection.rootEditableElement();
    ASSERT(editableRoot);
    if (!editableRoot)
        return;
    
    Node* shadowAncestorNode = editableRoot->shadowAncestorNode();
    
    if (!editableRoot->inlineEventListenerForType(eventNames().webkitBeforeTextInsertedEvent) &&
        // FIXME: Remove these checks once textareas and textfields actually register an event handler.
        !(shadowAncestorNode && shadowAncestorNode->renderer() && shadowAncestorNode->renderer()->isTextControl()) &&
        editableRoot->isContentRichlyEditable()) {
        removeInterchangeNodes(m_fragment.get());
        return;
    }

    Node* styleNode = selection.base().node();
    RefPtr<Node> holder = insertFragmentForTestRendering(styleNode);
    
    RefPtr<Range> range = VisibleSelection::selectionFromContentsOfNode(holder.get()).toNormalizedRange();
    String text = plainText(range.get());
    // Give the root a chance to change the text.
    RefPtr<BeforeTextInsertedEvent> evt = BeforeTextInsertedEvent::create(text);
    ExceptionCode ec = 0;
    editableRoot->dispatchEvent(evt, ec);
    ASSERT(ec == 0);
    if (text != evt->text() || !editableRoot->isContentRichlyEditable()) {
        restoreTestRenderingNodesToFragment(holder.get());
        removeNode(holder);

        m_fragment = createFragmentFromText(selection.toNormalizedRange().get(), evt->text());
        if (!m_fragment->firstChild())
            return;
        holder = insertFragmentForTestRendering(styleNode);
    }
    
    removeInterchangeNodes(holder.get());
    
    removeUnrenderedNodes(holder.get());
    restoreTestRenderingNodesToFragment(holder.get());
    removeNode(holder);
}

bool ReplacementFragment::isEmpty() const
{
    return (!m_fragment || !m_fragment->firstChild()) && !m_hasInterchangeNewlineAtStart && !m_hasInterchangeNewlineAtEnd;
}

Node *ReplacementFragment::firstChild() const 
{ 
    return m_fragment ? m_fragment->firstChild() : 0; 
}

Node *ReplacementFragment::lastChild() const 
{ 
    return m_fragment ? m_fragment->lastChild() : 0; 
}

void ReplacementFragment::removeNodePreservingChildren(Node *node)
{
    if (!node)
        return;

    while (RefPtr<Node> n = node->firstChild()) {
        removeNode(n);
        insertNodeBefore(n.release(), node);
    }
    removeNode(node);
}

void ReplacementFragment::removeNode(PassRefPtr<Node> node)
{
    if (!node)
        return;
    
    Node *parent = node->parentNode();
    if (!parent)
        return;
    
    ExceptionCode ec = 0;
    parent->removeChild(node.get(), ec);
    ASSERT(ec == 0);
}

void ReplacementFragment::insertNodeBefore(PassRefPtr<Node> node, Node* refNode)
{
    if (!node || !refNode)
        return;
        
    Node* parent = refNode->parentNode();
    if (!parent)
        return;
        
    ExceptionCode ec = 0;
    parent->insertBefore(node, refNode, ec);
    ASSERT(ec == 0);
}

PassRefPtr<Node> ReplacementFragment::insertFragmentForTestRendering(Node* context)
{
    Node* body = m_document->body();
    if (!body)
        return 0;

    RefPtr<StyledElement> holder = createDefaultParagraphElement(m_document.get());
    
    ExceptionCode ec = 0;

    // Copy the whitespace and user-select style from the context onto this element.
    // FIXME: We should examine other style properties to see if they would be appropriate to consider during the test rendering.
    Node* n = context;
    while (n && !n->isElementNode())
        n = n->parentNode();
    if (n) {
        RefPtr<CSSComputedStyleDeclaration> conFontStyle = computedStyle(n);
        CSSStyleDeclaration* style = holder->style();
        style->setProperty(CSSPropertyWhiteSpace, conFontStyle->getPropertyValue(CSSPropertyWhiteSpace), false, ec);
        ASSERT(ec == 0);
        style->setProperty(CSSPropertyWebkitUserSelect, conFontStyle->getPropertyValue(CSSPropertyWebkitUserSelect), false, ec);
        ASSERT(ec == 0);
    }
    
    holder->appendChild(m_fragment, ec);
    ASSERT(ec == 0);
    
    body->appendChild(holder.get(), ec);
    ASSERT(ec == 0);
    
    m_document->updateLayoutIgnorePendingStylesheets();
    
    return holder.release();
}

void ReplacementFragment::restoreTestRenderingNodesToFragment(Node *holder)
{
    if (!holder)
        return;
    
    ExceptionCode ec = 0;
    while (RefPtr<Node> node = holder->firstChild()) {
        holder->removeChild(node.get(), ec);
        ASSERT(ec == 0);
        m_fragment->appendChild(node.get(), ec);
        ASSERT(ec == 0);
    }
}

void ReplacementFragment::removeUnrenderedNodes(Node* holder)
{
    Vector<Node*> unrendered;

    for (Node* node = holder->firstChild(); node; node = node->traverseNextNode(holder))