/*

    Copyright (C) 2004, 2005, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>

                  2004, 2005, 2006, 2007, 2008 Rob Buis <buis@kde.org>

    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"

#if ENABLE(SVG)

#include "SVGTextContentElement.h"

#include "CSSPropertyNames.h"

#include "CSSValueKeywords.h"

#include "Frame.h"

#include "SVGTextQuery.h"

#include "SelectionController.h"

#include "XMLNames.h"

namespace WebCore {

SVGTextContentElement::SVGTextContentElement(const QualifiedName& tagName, Document* doc)

    : SVGStyledElement(tagName, doc)

    , SVGTests()

    , SVGLangSpace()

    , SVGExternalResourcesRequired()

    , m_textLength(LengthModeOther)

    , m_lengthAdjust(LENGTHADJUST_SPACING)

{

}

SVGTextContentElement::~SVGTextContentElement()

{

}

unsigned SVGTextContentElement::getNumberOfChars() const

{

    document()->updateLayoutIgnorePendingStylesheets();

    return SVGTextQuery(renderer()).numberOfCharacters();

}

float SVGTextContentElement::getComputedTextLength() const

{

    document()->updateLayoutIgnorePendingStylesheets();

    return SVGTextQuery(renderer()).textLength();

}

float SVGTextContentElement::getSubStringLength(unsigned charnum, unsigned nchars, ExceptionCode& ec) const

{

    document()->updateLayoutIgnorePendingStylesheets();

    unsigned numberOfChars = getNumberOfChars();

    if (charnum >= numberOfChars) {

        ec = INDEX_SIZE_ERR;

        return 0.0f;

    }

    return SVGTextQuery(renderer()).subStringLength(charnum, nchars);

}

FloatPoint SVGTextContentElement::getStartPositionOfChar(unsigned charnum, ExceptionCode& ec) const

{

    document()->updateLayoutIgnorePendingStylesheets();

    if (charnum > getNumberOfChars()) {

        ec = INDEX_SIZE_ERR;

        return FloatPoint();

    }

    return SVGTextQuery(renderer()).startPositionOfCharacter(charnum);

}

FloatPoint SVGTextContentElement::getEndPositionOfChar(unsigned charnum, ExceptionCode& ec) const

{

    document()->updateLayoutIgnorePendingStylesheets();

    if (charnum > getNumberOfChars()) {

        ec = INDEX_SIZE_ERR;

        return FloatPoint();

    }

    return SVGTextQuery(renderer()).endPositionOfCharacter(charnum);

}

FloatRect SVGTextContentElement::getExtentOfChar(unsigned charnum, ExceptionCode& ec) const

{

    document()->updateLayoutIgnorePendingStylesheets();

    if (charnum > getNumberOfChars()) {

        ec = INDEX_SIZE_ERR;

        return FloatRect();

    }

    return SVGTextQuery(renderer()).extentOfCharacter(charnum);

}

float SVGTextContentElement::getRotationOfChar(unsigned charnum, ExceptionCode& ec) const

{

    document()->updateLayoutIgnorePendingStylesheets();

    if (charnum > getNumberOfChars()) {

        ec = INDEX_SIZE_ERR;

        return 0.0f;

    }

    return SVGTextQuery(renderer()).rotationOfCharacter(charnum);

}

int SVGTextContentElement::getCharNumAtPosition(const FloatPoint& point) const

{

    document()->updateLayoutIgnorePendingStylesheets();

    return SVGTextQuery(renderer()).characterNumberAtPosition(point);

}

void SVGTextContentElement::selectSubString(unsigned charnum, unsigned nchars, ExceptionCode& ec) const

{

    unsigned numberOfChars = getNumberOfChars();

    if (charnum >= numberOfChars) {

        ec = INDEX_SIZE_ERR;

        return;

    }

    if (nchars > numberOfChars - charnum)

        nchars = numberOfChars - charnum;

    ASSERT(document());

    ASSERT(document()->frame());

    SelectionController* controller = document()->frame()->selection();

    if (!controller)

        return;

    // Find selection start

    VisiblePosition start(const_cast<SVGTextContentElement*>(this), 0, SEL_DEFAULT_AFFINITY);

    for (unsigned i = 0; i < charnum; ++i)

        start = start.next();

    // Find selection end

    VisiblePosition end(start);

    for (unsigned i = 0; i < nchars; ++i)

        end = end.next();

    controller->setSelection(VisibleSelection(start, end));

}

void SVGTextContentElement::parseMappedAttribute(Attribute* attr)

{

    if (attr->name() == SVGNames::lengthAdjustAttr) {

        if (attr->value() == "spacing")

            setLengthAdjustBaseValue(LENGTHADJUST_SPACING);

        else if (attr->value() == "spacingAndGlyphs")

            setLengthAdjustBaseValue(LENGTHADJUST_SPACINGANDGLYPHS);

    } else if (attr->name() == SVGNames::textLengthAttr) {

        setTextLengthBaseValue(SVGLength(LengthModeOther, attr->value()));

        if (textLengthBaseValue().value(this) < 0.0)

            document()->accessSVGExtensions()->reportError("A negative value for text attribute <textLength> is not allowed");

    } else {

        if (SVGTests::parseMappedAttribute(attr))

            return;

        if (SVGLangSpace::parseMappedAttribute(attr)) {

            if (attr->name().matches(XMLNames::spaceAttr)) {

                DEFINE_STATIC_LOCAL(const AtomicString, preserveString, ("preserve"));

                if (attr->value() == preserveString)

                    addCSSProperty(attr, CSSPropertyWhiteSpace, CSSValuePre);

                else

                    addCSSProperty(attr, CSSPropertyWhiteSpace, CSSValueNowrap);

            }

            return;

        }

        if (SVGExternalResourcesRequired::parseMappedAttribute(attr))

            return;

        SVGStyledElement::parseMappedAttribute(attr);

    }

}

void SVGTextContentElement::synchronizeProperty(const QualifiedName& attrName)

{

    SVGStyledElement::synchronizeProperty(attrName);

    if (attrName == anyQName()) {

        synchronizeLengthAdjust();

        synchronizeTextLength();

        synchronizeExternalResourcesRequired();

        return;

    }

    if (attrName == SVGNames::lengthAdjustAttr)

        synchronizeLengthAdjust();

    else if (attrName == SVGNames::textLengthAttr)

        synchronizeTextLength();

    else if (SVGExternalResourcesRequired::isKnownAttribute(attrName))

        synchronizeExternalResourcesRequired();

}

bool SVGTextContentElement::isKnownAttribute(const QualifiedName& attrName)

{

    return (attrName.matches(SVGNames::lengthAdjustAttr) ||

            attrName.matches(SVGNames::textLengthAttr) ||

            SVGTests::isKnownAttribute(attrName) ||

            SVGLangSpace::isKnownAttribute(attrName) ||

            SVGExternalResourcesRequired::isKnownAttribute(attrName) ||

            SVGStyledElement::isKnownAttribute(attrName));

}

bool SVGTextContentElement::selfHasRelativeLengths() const

{

    return textLength().isRelative();

}

}

#endif // ENABLE(SVG)