SVGPathStringSource.cpp

/*
 * Copyright (C) Research In Motion Limited 2010. All rights reserved.
 *
 * 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 "SVGPathStringSource.h"

#include "SVGParserUtilities.h"

namespace WebCore {

SVGPathStringSource::SVGPathStringSource(const String& string)
    : m_string(string)
    , m_current(string.characters())
    , m_end(m_current + string.length())
{
    ASSERT(!string.isEmpty());
}

bool SVGPathStringSource::hasMoreData() const
{
    return m_current < m_end;
}

bool SVGPathStringSource::moveToNextToken()
{
    return skipOptionalSVGSpaces(m_current, m_end);
}

bool SVGPathStringSource::parseSVGSegmentType(SVGPathSegType& pathSegType)
{
    switch (*(m_current++)) {
    case 'Z':
    case 'z':
        pathSegType = PathSegClosePath;
        break;
    case 'M':
        pathSegType = PathSegMoveToAbs;
        break;
    case 'm':
        pathSegType = PathSegMoveToRel;
        break;
    case 'L':
        pathSegType = PathSegLineToAbs;
        break;
    case 'l':
        pathSegType = PathSegLineToRel;
        break;
    case 'C':
        pathSegType = PathSegCurveToCubicAbs;
        break;
    case 'c':
        pathSegType = PathSegCurveToCubicRel;
        break;
    case 'Q':
        pathSegType = PathSegCurveToQuadraticAbs;
        break;
    case 'q':
        pathSegType = PathSegCurveToQuadraticRel;
        break;
    case 'A':
        pathSegType = PathSegArcAbs;
        break;
    case 'a':
        pathSegType = PathSegArcRel;
        break;
    case 'H':
        pathSegType = PathSegLineToHorizontalAbs;
        break;
    case 'h':
        pathSegType = PathSegLineToHorizontalRel;
        break;
    case 'V':
        pathSegType = PathSegLineToVerticalAbs;
        break;
    case 'v':
        pathSegType = PathSegLineToVerticalRel;
        break;
    case 'S':
        pathSegType = PathSegCurveToCubicSmoothAbs;
        break;
    case 's':
        pathSegType = PathSegCurveToCubicSmoothRel;
        break;
    case 'T':
        pathSegType = PathSegCurveToQuadraticSmoothAbs;
        break;
    case 't':
        pathSegType = PathSegCurveToQuadraticSmoothRel;
        break;
    default:
        pathSegType = PathSegUnknown;
    }
    return true;
}

SVGPathSegType SVGPathStringSource::nextCommand(SVGPathSegType previousCommand)
{
    // Check for remaining coordinates in the current command.
    if ((*m_current == '+' || *m_current == '-' || *m_current == '.' || (*m_current >= '0' && *m_current <= '9'))
        && previousCommand != PathSegClosePath) {
        if (previousCommand == PathSegMoveToAbs)
            return PathSegLineToAbs;
        if (previousCommand == PathSegMoveToRel)
            return PathSegLineToRel;
        return previousCommand;
    }
    SVGPathSegType nextCommand;
    parseSVGSegmentType(nextCommand);
    return nextCommand;
}

bool SVGPathStringSource::parseMoveToSegment(FloatPoint& targetPoint)
{
    float toX;
    float toY;
    if (!parseNumber(m_current, m_end, toX) || !parseNumber(m_current, m_end, toY))
        return false;
    targetPoint = FloatPoint(toX, toY);
    return true;
}

bool SVGPathStringSource::parseLineToSegment(FloatPoint& targetPoint)
{
    float toX;
    float toY;
    if (!parseNumber(m_current, m_end, toX) || !parseNumber(m_current, m_end, toY))
        return false;
    targetPoint = FloatPoint(toX, toY);
    return true;
}

bool SVGPathStringSource::parseLineToHorizontalSegment(float& x)
{
    return parseNumber(m_current, m_end, x);
}

bool SVGPathStringSource::parseLineToVerticalSegment(float& y)
{
    return parseNumber(m_current, m_end, y);
}

bool SVGPathStringSource::parseCurveToCubicSegment(FloatPoint& point1, FloatPoint& point2, FloatPoint& targetPoint)
{
    float x1;
    float y1;
    float x2;
    float y2;
    float toX;
    float toY;
    if (!parseNumber(m_current, m_end, x1)
        || !parseNumber(m_current, m_end, y1)
        || !parseNumber(m_current, m_end, x2)
        || !parseNumber(m_current, m_end, y2)
        || !parseNumber(m_current, m_end, toX)
        || !parseNumber(m_current, m_end, toY))
        return false;
    point1 = FloatPoint(x1, y1);
    point2 = FloatPoint(x2, y2);
    targetPoint = FloatPoint(toX, toY);
    return true;
}

bool SVGPathStringSource::parseCurveToCubicSmoothSegment(FloatPoint& point1, FloatPoint& targetPoint)
{
    float x1;
    float y1;
    float toX;
    float toY;
    if (!parseNumber(m_current, m_end, x1)
        || !parseNumber(m_current, m_end, y1)
        || !parseNumber(m_current, m_end, toX)
        || !parseNumber(m_current, m_end, toY))
        return false;
    point1 = FloatPoint(x1, y1);
    targetPoint = FloatPoint(toX, toY);
    return true;
}

bool SVGPathStringSource::parseCurveToQuadraticSegment(FloatPoint& point2, FloatPoint& targetPoint)
{
    float x2;
    float y2;
    float toX;
    float toY;
    if (!parseNumber(m_current, m_end, x2)
        || !parseNumber(m_current, m_end, y2)
        || !parseNumber(m_current, m_end, toX)
        || !parseNumber(m_current, m_end, toY))
        return false;
    point2 = FloatPoint(x2, y2);
    targetPoint = FloatPoint(toX, toY);
    return true;
}

bool SVGPathStringSource::parseCurveToQuadraticSmoothSegment(FloatPoint& targetPoint)
{
    float toX;
    float toY;
    if (!parseNumber(m_current, m_end, toX)
        || !parseNumber(m_current, m_end, toY))
        return false;
    targetPoint = FloatPoint(toX, toY);
    return true;
}

bool SVGPathStringSource::parseArcToSegment(float& rx, float& ry, float& angle, bool& largeArc, bool& sweep, FloatPoint& targetPoint)
{
    float toX;
    float toY;
    if (!parseNumber(m_current, m_end, rx)
        || !parseNumber(m_current, m_end, ry)
        || !parseNumber(m_current, m_end, angle)
        || !parseArcFlag(m_current, m_end, largeArc)
        || !parseArcFlag(m_current, m_end, sweep)
        || !parseNumber(m_current, m_end, toX)
        || !parseNumber(m_current, m_end, toY))
        return false;
    targetPoint = FloatPoint(toX, toY);
    return true;
}


}

#endif // ENABLE(SVG)