Source/core/editing/SplitTextNodeCommand.cpp

/*
 * Copyright (C) 2005, 2008 Apple Inc. All rights reserved.
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#include "config.h"
#include "core/editing/SplitTextNodeCommand.h"

#include "bindings/v8/ExceptionState.h"
#include "bindings/v8/ExceptionStatePlaceholder.h"
#include "core/dom/Document.h"
#include "core/dom/DocumentMarkerController.h"
#include "core/dom/Text.h"
#include "wtf/Assertions.h"

namespace WebCore {

SplitTextNodeCommand::SplitTextNodeCommand(PassRefPtr<Text> text, int offset)
    : SimpleEditCommand(text->document())
    , m_text2(text)
    , m_offset(offset)
{
    // NOTE: Various callers rely on the fact that the original node becomes
    // the second node (i.e. the new node is inserted before the existing one).
    // That is not a fundamental dependency (i.e. it could be re-coded), but
    // rather is based on how this code happens to work.
    ASSERT(m_text2);
    ASSERT(m_text2->length() > 0);
    ASSERT(m_offset > 0);
    ASSERT(m_offset < m_text2->length());
}

void SplitTextNodeCommand::doApply()
{
    ContainerNode* parent = m_text2->parentNode();
    if (!parent || !parent->rendererIsEditable())
        return;

    String prefixText = m_text2->substringData(0, m_offset, IGNORE_EXCEPTION);
    if (prefixText.isEmpty())
        return;

    m_text1 = Text::create(document(), prefixText);
    ASSERT(m_text1);
    document().markers()->copyMarkers(m_text2.get(), 0, m_offset, m_text1.get(), 0);

    insertText1AndTrimText2();
}

void SplitTextNodeCommand::doUnapply()
{
    if (!m_text1 || !m_text1->rendererIsEditable())
        return;

    ASSERT(&m_text1->document() == &document());

    String prefixText = m_text1->data();

    m_text2->insertData(0, prefixText, ASSERT_NO_EXCEPTION, CharacterData::DeprecatedRecalcStyleImmediatlelyForEditing);

    document().markers()->copyMarkers(m_text1.get(), 0, prefixText.length(), m_text2.get(), 0);
    m_text1->remove(ASSERT_NO_EXCEPTION);
}

void SplitTextNodeCommand::doReapply()
{
    if (!m_text1 || !m_text2)
        return;

    ContainerNode* parent = m_text2->parentNode();
    if (!parent || !parent->rendererIsEditable())
        return;

    insertText1AndTrimText2();
}

void SplitTextNodeCommand::insertText1AndTrimText2()
{
    TrackExceptionState es;
    m_text2->parentNode()->insertBefore(m_text1.get(), m_text2.get(), es);
    if (es.hadException())
        return;
    m_text2->deleteData(0, m_offset, es, CharacterData::DeprecatedRecalcStyleImmediatlelyForEditing);
}

} // namespace WebCore