htmlediting_impl.cpp

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/*
 * Copyright (C) 2004 Apple Computer, 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 "htmlediting_impl.h"

#include "cssproperties.h"
#include "css/css_valueimpl.h"
#include "dom/css_value.h"
#include "dom/dom_position.h"
#include "html/html_elementimpl.h"
#include "html/html_imageimpl.h"
#include "htmlattrs.h"
#include "htmltags.h"
#include "khtml_part.h"
#include "khtmlview.h"
#include "qptrlist.h"
#include "rendering/render_object.h"
#include "rendering/render_style.h"
#include "rendering/render_text.h"
#include "xml/dom_docimpl.h"
#include "xml/dom_elementimpl.h"
#include "xml/dom_positioniterator.h"
#include "xml/dom_nodeimpl.h"
#include "xml/dom_selection.h"
#include "xml/dom_stringimpl.h"
#include "xml/dom_textimpl.h"
#include "xml/dom2_rangeimpl.h"
#include "xml/dom2_viewsimpl.h"

#if APPLE_CHANGES
#include "KWQAssertions.h"
#include "KWQLogging.h"
#endif

using DOM::AttrImpl;
using DOM::CSSPrimitiveValue;
using DOM::CSSPrimitiveValueImpl;
using DOM::CSSProperty;
using DOM::CSSStyleDeclarationImpl;
using DOM::CSSValueImpl;
using DOM::DocumentFragmentImpl;
using DOM::DocumentImpl;
using DOM::DOMString;
using DOM::DOMStringImpl;
using DOM::EditingTextImpl;
using DOM::PositionIterator;
using DOM::ElementImpl;
using DOM::HTMLElementImpl;
using DOM::HTMLImageElementImpl;
using DOM::NamedAttrMapImpl;
using DOM::Node;
using DOM::NodeImpl;
using DOM::NodeListImpl;
using DOM::Position;
using DOM::Range;
using DOM::RangeImpl;
using DOM::Selection;
using DOM::TextImpl;
using DOM::TreeWalkerImpl;

#if !APPLE_CHANGES
#define ASSERT(assertion) ((void)0)
#define ASSERT_WITH_MESSAGE(assertion, formatAndArgs...) ((void)0)
#define ASSERT_NOT_REACHED() ((void)0)
#define LOG(channel, formatAndArgs...) ((void)0)
#define ERROR(formatAndArgs...) ((void)0)
#if LOG_DISABLED
#define debugPosition(a,b) ((void)0)
#endif
#endif

namespace khtml {


static inline bool isNBSP(const QChar &c)
{
    return c == QChar(0xa0);
}

static inline bool isWS(const QChar &c)
{
    return c.isSpace() && c != QChar(0xa0);
}

static inline bool isWS(const DOMString &text)
{
    if (text.length() != 1)
        return false;
    
    return isWS(text[0]);
}

static inline bool isWS(const Position &pos)
{
    if (!pos.node())
        return false;
        
    if (!pos.node()->isTextNode())
        return false;

    const DOMString &string = static_cast<TextImpl *>(pos.node())->data();
    return isWS(string[pos.offset()]);
}

static bool shouldPruneNode(NodeImpl *node)
{
    if (!node)
        return false;

    RenderObject *renderer = node->renderer();
    if (!renderer)
        return true;

    if (node->hasChildNodes())
        return false;
        
    if (node->rootEditableElement() == node)
        return false;
        
    if (renderer->isBR() || renderer->isReplaced())
        return false;
        
    if (node->isTextNode()) {
        TextImpl *text = static_cast<TextImpl *>(node);
        if (text->length() == 0)
            return true;
        return false;
    }
    
    if (!node->isHTMLElement() && !node->isXMLElementNode())
        return false;
    
    if (node->id() == ID_BODY)
        return false;
            
    if (!node->isContentEditable())
        return false;
            
    return true;
}

static Position leadingWhitespacePosition(const Position &pos)
{
    ASSERT(pos.notEmpty());

    Selection selection(pos);
    Position prev = pos.previousCharacterPosition();
    if (prev != pos && prev.node()->inSameContainingBlockFlowElement(pos.node()) && prev.node()->isTextNode()) {
        DOMString string = static_cast<TextImpl *>(prev.node())->data();
        if (isWS(string[prev.offset()]))
            return prev;
    }

    return Position();
}

static Position trailingWhitespacePosition(const Position &pos)
{
    ASSERT(pos.notEmpty());

    if (pos.node()->isTextNode()) {
        TextImpl *textNode = static_cast<TextImpl *>(pos.node());
        if (pos.offset() >= (long)textNode->length()) {
            Position next = pos.nextCharacterPosition();
            if (next != pos && next.node()->inSameContainingBlockFlowElement(pos.node()) && next.node()->isTextNode()) {
                DOMString string = static_cast<TextImpl *>(next.node())->data();
                if (isWS(string[0]))
                    return next;
            }
        }
        else {
            DOMString string = static_cast<TextImpl *>(pos.node())->data();
            if (isWS(string[pos.offset()]))
                return pos;
        }
    }

    return Position();
}

static bool textNodesAreJoinable(TextImpl *text1, TextImpl *text2)
{
    ASSERT(text1);
    ASSERT(text2);
    
    return (text1->nextSibling() == text2);
}

static DOMString &nonBreakingSpaceString()
{
    static DOMString nonBreakingSpaceString = QString(QChar(0xa0));
    return nonBreakingSpaceString;
}

static DOMString &styleSpanClassString()
{
    static DOMString styleSpanClassString = "khtml-style-span";
    return styleSpanClassString;
}

static void debugPosition(const char *prefix, const Position &pos)
{
    //LOG(Editing, "%s%s %p : %d", prefix, getTagName(pos.node()->id()).string().latin1(), pos.node(), pos.offset());
}

//------------------------------------------------------------------------------------------
// EditCommandImpl

EditCommandImpl::EditCommandImpl(DocumentImpl *document) 
    : SharedCommandImpl(), m_document(document), m_state(NotApplied), m_parent(0)
{
    ASSERT(m_document);
    ASSERT(m_document->part());
    m_document->ref();
    m_startingSelection = m_document->part()->selection();
    m_endingSelection = m_startingSelection;
}

EditCommandImpl::~EditCommandImpl()
{
    ASSERT(m_document);
    m_document->deref();
}

int EditCommandImpl::commandID() const
{
    return EditCommandID;
}

void EditCommandImpl::apply()
{
    ASSERT(m_document);
    ASSERT(m_document->part());
    ASSERT(state() == NotApplied);
    
    doApply();
    
    m_state = Applied;

    if (!isCompositeStep()) {
        EditCommand cmd(this);
        m_document->part()->appliedEditing(cmd);
    }
}

void EditCommandImpl::unapply()
{
    ASSERT(m_document);
    ASSERT(m_document->part());
    ASSERT(state() == Applied);
    
    doUnapply();
    
    m_state = NotApplied;

    if (!isCompositeStep()) {
        EditCommand cmd(this);
        m_document->part()->unappliedEditing(cmd);
    }
}

void EditCommandImpl::reapply()
{
    ASSERT(m_document);
    ASSERT(m_document->part());
    ASSERT(state() == NotApplied);
    
    doReapply();
    
    m_state = Applied;

    if (!isCompositeStep()) {
        EditCommand cmd(this);
        m_document->part()->reappliedEditing(cmd);
    }
}

void EditCommandImpl::doReapply()
{
    doApply();
}

void EditCommandImpl::setStartingSelection(const Selection &s)
{
    m_startingSelection = s;
    EditCommand cmd = parent();
    while (cmd.notNull()) {
        cmd.handle()->m_startingSelection = s;
        cmd = cmd.parent();
    }
}

void EditCommandImpl::setEndingSelection(const Selection &s)
{
    m_endingSelection = s;
    EditCommand cmd = parent();
    while (cmd.notNull()) {
        cmd.handle()->m_endingSelection = s;
        cmd = cmd.parent();
    }
}

EditCommand EditCommandImpl::parent() const
{
    return m_parent;
}

void EditCommandImpl::setParent(const EditCommand &cmd)
{
    m_parent = cmd;
}

//------------------------------------------------------------------------------------------
// CompositeEditCommandImpl

CompositeEditCommandImpl::CompositeEditCommandImpl(DocumentImpl *document) 
    : EditCommandImpl(document)
{
}

CompositeEditCommandImpl::~CompositeEditCommandImpl()
{
}

int CompositeEditCommandImpl::commandID() const
{
    return CompositeEditCommandID;
}

void CompositeEditCommandImpl::doUnapply()
{
    if (m_cmds.count() == 0) {
        return;
    }
    
    for (int i = m_cmds.count() - 1; i >= 0; --i)
        m_cmds[i]->unapply();

    setState(NotApplied);
}

void CompositeEditCommandImpl::doReapply()
{
    if (m_cmds.count() == 0) {
        return;
    }

    for (QValueList<EditCommand>::ConstIterator it = m_cmds.begin(); it != m_cmds.end(); ++it)
        (*it)->reapply();

    setState(Applied);
}

//
// sugary-sweet convenience functions to help create and apply edit commands in composite commands
//