third_party/WebKit/Source/core/svg/SVGLengthList.cpp

/*
 * Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann@kde.org>
 * Copyright (C) 2004, 2005, 2006 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 "core/svg/SVGLengthList.h"

#include "core/svg/SVGAnimationElement.h"
#include "core/svg/SVGParserUtilities.h"
#include "wtf/text/StringBuilder.h"

namespace blink {

SVGLengthList::SVGLengthList(SVGLengthMode mode)
    : m_mode(mode)
{
}

SVGLengthList::~SVGLengthList()
{
}

SVGLengthList* SVGLengthList::clone()
{
    SVGLengthList* ret = SVGLengthList::create(m_mode);
    ret->deepCopy(this);
    return ret;
}

SVGPropertyBase* SVGLengthList::cloneForAnimation(const String& value) const
{
    SVGLengthList* ret = SVGLengthList::create(m_mode);
    ret->setValueAsString(value);
    return ret;
}

String SVGLengthList::valueAsString() const
{
    StringBuilder builder;

    ConstIterator it = begin();
    ConstIterator itEnd = end();
    if (it != itEnd) {
        builder.append(it->valueAsString());
        ++it;

        for (; it != itEnd; ++it) {
            builder.append(' ');
            builder.append(it->valueAsString());
        }
    }

    return builder.toString();
}

template <typename CharType>
SVGParsingError SVGLengthList::parseInternal(const CharType*& ptr, const CharType* end)
{
    const CharType* listStart = ptr;
    while (ptr < end) {
        const CharType* start = ptr;
        // TODO(shanmuga.m): Enable calc for SVGLengthList
        while (ptr < end && *ptr != ',' && !isHTMLSpace<CharType>(*ptr))
            ptr++;
        if (ptr == start)
            break;
        String valueString(start, ptr - start);
        if (valueString.isEmpty())
            break;

        SVGLength* length = SVGLength::create(m_mode);
        SVGParsingError lengthParseStatus = length->setValueAsString(valueString);
        if (lengthParseStatus != SVGParseStatus::NoError)
            return lengthParseStatus.offsetWith(start - listStart);
        append(length);
        skipOptionalSVGSpacesOrDelimiter(ptr, end);
    }
    return SVGParseStatus::NoError;
}

SVGParsingError SVGLengthList::setValueAsString(const String& value)
{
    clear();

    if (value.isEmpty())
        return SVGParseStatus::NoError;

    if (value.is8Bit()) {
        const LChar* ptr = value.characters8();
        const LChar* end = ptr + value.length();
        return parseInternal(ptr, end);
    }
    const UChar* ptr = value.characters16();
    const UChar* end = ptr + value.length();
    return parseInternal(ptr, end);
}

void SVGLengthList::add(SVGPropertyBase* other, SVGElement* contextElement)
{
    SVGLengthList* otherList = toSVGLengthList(other);

    if (length() != otherList->length())
        return;

    SVGLengthContext lengthContext(contextElement);
    for (size_t i = 0; i < length(); ++i)
        at(i)->setValue(at(i)->value(lengthContext) + otherList->at(i)->value(lengthContext), lengthContext);
}

SVGLength* SVGLengthList::createPaddingItem() const
{
    return SVGLength::create(m_mode);
}

void SVGLengthList::calculateAnimatedValue(SVGAnimationElement* animationElement, float percentage, unsigned repeatCount, SVGPropertyBase* fromValue, SVGPropertyBase* toValue, SVGPropertyBase* toAtEndOfDurationValue, SVGElement* contextElement)
{
    SVGLengthList* fromList = toSVGLengthList(fromValue);
    SVGLengthList* toList = toSVGLengthList(toValue);
    SVGLengthList* toAtEndOfDurationList = toSVGLengthList(toAtEndOfDurationValue);

    SVGLengthContext lengthContext(contextElement);
    ASSERT(m_mode == SVGLength::lengthModeForAnimatedLengthAttribute(animationElement->attributeName()));

    size_t fromLengthListSize = fromList->length();
    size_t toLengthListSize = toList->length();
    size_t toAtEndOfDurationListSize = toAtEndOfDurationList->length();

    if (!adjustFromToListValues(fromList, toList, percentage, animationElement->getAnimationMode()))
        return;

    for (size_t i = 0; i < toLengthListSize; ++i) {
        // TODO(shanmuga.m): Support calc for SVGLengthList animation
        float animatedNumber = at(i)->value(lengthContext);
        CSSPrimitiveValue::UnitType unitType = toList->at(i)->typeWithCalcResolved();
        float effectiveFrom = 0;
        if (fromLengthListSize) {
            if (percentage < 0.5)
                unitType = fromList->at(i)->typeWithCalcResolved();
            effectiveFrom = fromList->at(i)->value(lengthContext);
        }
        float effectiveTo = toList->at(i)->value(lengthContext);
        float effectiveToAtEnd = i < toAtEndOfDurationListSize ? toAtEndOfDurationList->at(i)->value(lengthContext) : 0;

        animationElement->animateAdditiveNumber(percentage, repeatCount, effectiveFrom, effectiveTo, effectiveToAtEnd, animatedNumber);
        at(i)->setUnitType(unitType);
        at(i)->setValue(animatedNumber, lengthContext);
    }
}

float SVGLengthList::calculateDistance(SVGPropertyBase* to, SVGElement*)
{
    // FIXME: Distance calculation is not possible for SVGLengthList right now. We need the distance for every single value.
    return -1;
}
} // namespace blink