Source/WebCore/editing/ReplaceSelectionCommand.h

/*
 * 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 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 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. 
 */

#pragma once

#include "CompositeEditCommand.h"
#include "NodeTraversal.h"

namespace WebCore {

class DocumentFragment;
class ReplacementFragment;

class ReplaceSelectionCommand : public CompositeEditCommand {
public:
    enum CommandOption {
        SelectReplacement = 1 << 0,
        SmartReplace = 1 << 1,
        MatchStyle = 1 << 2,
        PreventNesting = 1 << 3,
        MovingParagraph = 1 << 4,
        SanitizeFragment = 1 << 5,
        IgnoreMailBlockquote = 1 << 6,
    };

    static Ref<ReplaceSelectionCommand> create(Document& document, RefPtr<DocumentFragment>&& fragment, OptionSet<CommandOption> options, EditAction editingAction = EditAction::Insert)
    {
        return adoptRef(*new ReplaceSelectionCommand(document, WTFMove(fragment), options, editingAction));
    }

    VisibleSelection visibleSelectionForInsertedText() const { return m_visibleSelectionForInsertedText; }

private:
    ReplaceSelectionCommand(Document&, RefPtr<DocumentFragment>&&, OptionSet<CommandOption>, EditAction);

    String inputEventData() const final;
    RefPtr<DataTransfer> inputEventDataTransfer() const final;
    bool willApplyCommand() final;
    void doApply() override;

    class InsertedNodes {
    public:
        void respondToNodeInsertion(Node*);
        void willRemoveNodePreservingChildren(Node*);
        void willRemoveNode(Node*);
        void didReplaceNode(Node*, Node* newNode);

        bool isEmpty() { return !m_firstNodeInserted; }
        Node* firstNodeInserted() const { return m_firstNodeInserted.get(); }
        Node* lastLeafInserted() const
        {
            ASSERT(m_lastNodeInserted);
            return m_lastNodeInserted->lastDescendant();
        }
        Node* pastLastLeaf() const
        {
            ASSERT(m_lastNodeInserted);
            return NodeTraversal::next(*lastLeafInserted());
        }

    private:
        RefPtr<Node> m_firstNodeInserted;
        RefPtr<Node> m_lastNodeInserted;
    };

    Node* insertAsListItems(HTMLElement& listElement, Node* insertionNode, const Position&, InsertedNodes&);

    void updateNodesInserted(Node*);
    bool shouldRemoveEndBR(Node*, const VisiblePosition&);
    
    bool shouldMergeStart(bool, bool, bool);
    bool shouldMergeEnd(bool selectionEndWasEndOfParagraph);
    bool shouldMerge(const VisiblePosition&, const VisiblePosition&);
    
    void mergeEndIfNeeded();
    
    void removeUnrenderedTextNodesAtEnds(InsertedNodes&);
    
    void removeRedundantStylesAndKeepStyleSpanInline(InsertedNodes&);
    void makeInsertedContentRoundTrippableWithHTMLTreeBuilder(InsertedNodes&);
    void moveNodeOutOfAncestor(Node&, Node& ancestor, InsertedNodes&);
    void handleStyleSpans(InsertedNodes&);
    void handlePasteAsQuotationNode();
    
    VisiblePosition positionAtStartOfInsertedContent() const;
    VisiblePosition positionAtEndOfInsertedContent() const;

    bool shouldPerformSmartReplace() const;
    bool shouldPerformSmartParagraphReplace() const;
    void addSpacesForSmartReplace();
    void addNewLinesForSmartReplace();
    void completeHTMLReplacement(const Position& lastPositionToSelect);
    void mergeTextNodesAroundPosition(Position&, Position& positionOnlyToBeUpdated);

    ReplacementFragment* ensureReplacementFragment();
    bool performTrivialReplace(const ReplacementFragment&);

    VisibleSelection m_visibleSelectionForInsertedText;
    Position m_startOfInsertedContent;
    Position m_endOfInsertedContent;
    RefPtr<EditingStyle> m_insertionStyle;
    bool m_selectReplacement;
    bool m_smartReplace;
    bool m_matchStyle;
    RefPtr<DocumentFragment> m_documentFragment;
    std::unique_ptr<ReplacementFragment> m_replacementFragment;
    String m_documentFragmentHTMLMarkup;
    String m_documentFragmentPlainText;
    bool m_preventNesting;
    bool m_movingParagraph;
    bool m_sanitizeFragment;
    bool m_shouldMergeEnd;
    bool m_ignoreMailBlockquote;
};

} // namespace WebCore