/**

 * This file is part of the DOM implementation for KDE.

 *

 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)

 *           (C) 1999 Antti Koivisto (koivisto@kde.org)

 * Copyright (C) 2003 Apple Computer, Inc.

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Library General Public

 * License as published by the Free Software Foundation; either

 * version 2 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Library General Public License for more details.

 *

 * You should have received a copy of the GNU Library General Public License

 * along with this library; see the file COPYING.LIB.  If not, write to

 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

 * Boston, MA 02110-1301, USA.

 */

#include "config.h"

#include "Text.h"

#include "Document.h"

#include "ExceptionCode.h"

#include "RenderText.h"

#include "TextBreakIterator.h"

#if ENABLE(SVG)

#include "RenderSVGInlineText.h"

#endif // ENABLE(SVG)

namespace WebCore {

// DOM Section 1.1.1

// ### allow having children in text nodes for entities, comments etc.

Text::Text(Document *doc, const String &_text)

    : CharacterData(doc, _text)

{

}

Text::Text(Document *doc)

    : CharacterData(doc)

{

}

Text::~Text()

{

}

Text *Text::splitText(unsigned offset, ExceptionCode& ec)

{

    ec = 0;

    // FIXME: This does not copy markers

    // INDEX_SIZE_ERR: Raised if the specified offset is negative or greater than

    // the number of 16-bit units in data.

    if (offset > str->length()) {

        ec = INDEX_SIZE_ERR;

        return 0;

    }

    // NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.

    if (isReadOnlyNode()) {

        ec = NO_MODIFICATION_ALLOWED_ERR;

        return 0;

    }

    StringImpl *oldStr = str;

    Text *newText = createNew(str->substring(offset, str->length()-offset));

    str = str->copy();

    str->ref();

    str->remove(offset, str->length()-offset);

    dispatchModifiedEvent(oldStr);

    oldStr->deref();

    if (parentNode())

        parentNode()->insertBefore(newText,nextSibling(), ec);

    if (ec)

        return 0;

    if (renderer())

        static_cast<RenderText*>(renderer())->setText(str);

    return newText;

}

const AtomicString& Text::localName() const

{

    return textAtom;

}

String Text::nodeName() const

{

    return textAtom.domString();

}

Node::NodeType Text::nodeType() const

{

    return TEXT_NODE;

}

PassRefPtr<Node> Text::cloneNode(bool /*deep*/)

{

    return document()->createTextNode(str);

}

bool Text::rendererIsNeeded(RenderStyle *style)

{

    if (!CharacterData::rendererIsNeeded(style))

        return false;

    bool onlyWS = containsOnlyWhitespace();

    if (!onlyWS)

        return true;

    RenderObject *par = parentNode()->renderer();

    if (par->isTable() || par->isTableRow() || par->isTableSection() || par->isTableCol() || par->isFrameSet())

        return false;

    if (style->preserveNewline()) // pre/pre-wrap/pre-line always make renderers.

        return true;

    RenderObject *prev = previousRenderer();

    if (prev && prev->isBR()) // <span><br/> <br/></span>

        return false;

    if (par->isInlineFlow()) {

        // <span><div/> <div/></span>

        if (prev && !prev->isInline())

            return false;

    } else {

        if (par->isRenderBlock() && !par->childrenInline() && (!prev || !prev->isInline()))

            return false;

        RenderObject *first = par->firstChild();

        while (first && first->isFloatingOrPositioned())

            first = first->nextSibling();

        RenderObject *next = nextRenderer();

        if (!first || next == first)

            // Whitespace at the start of a block just goes away.  Don't even

            // make a render object for this text.

            return false;

    }

    return true;

}

RenderObject *Text::createRenderer(RenderArena *arena, RenderStyle *style)

{

#if ENABLE(SVG)

    if (parentNode()->isSVGElement())

        return new (arena) RenderSVGInlineText(this, str);

#endif // ENABLE(SVG)

    return new (arena) RenderText(this, str);

}

void Text::attach()

{

    createRendererIfNeeded();

    CharacterData::attach();

}

void Text::recalcStyle( StyleChange change )

{

    if (change != NoChange && parentNode())

        if (renderer())

            renderer()->setStyle(parentNode()->renderer()->style());

    if (changed() && renderer() && renderer()->isText())

        static_cast<RenderText*>(renderer())->setText(str);

    setChanged(NoStyleChange);

}

// DOM Section 1.1.1

bool Text::childTypeAllowed(NodeType)

{

    return false;

}

Text *Text::createNew(StringImpl *_str)

{

    return new Text(document(), _str);

}

String Text::toString() const

{

    // FIXME: substitute entity references as needed!

    return nodeValue();

}

PassRefPtr<Text> Text::createWithLengthLimit(Document* doc, const String& text, unsigned& charsLeft, unsigned maxChars)

{

    if (charsLeft == text.length() && charsLeft <= maxChars) {

        charsLeft = 0;

        return new Text(doc, text);

    }

    unsigned start = text.length() - charsLeft;

    unsigned end = start + std::min(charsLeft, maxChars);

    // check we are not on an unbreakable boundary

    TextBreakIterator* it = characterBreakIterator(text.characters(), text.length());

    if (end < text.length() && !isTextBreak(it, end))

        end = textBreakPreceding(it, end);

    // maxChars of unbreakable characters could lead to infinite loop

    if (end <= start)

        end = text.length();

    String nodeText = text.substring(start, end - start);

    charsLeft = text.length() - end;

    return new Text(doc, nodeText);

}

#ifndef NDEBUG

void Text::formatForDebugger(char *buffer, unsigned length) const

{

    String result;

    String s;

    s = nodeName();

    if (s.length() > 0) {

        result += s;

    }

    s = nodeValue();

    if (s.length() > 0) {

        if (result.length() > 0)

            result += "; ";

        result += "value=";

        result += s;

    }

    strncpy(buffer, result.deprecatedString().latin1(), length - 1);

}

#endif

} // namespace WebCore