root/Source/core/svg/SVGPathStringSource.cpp

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DEFINITIONS

This source file includes following definitions.
  1. m_is8BitSource
  2. hasMoreData
  3. moveToNextToken
  4. parseSVGSegmentTypeHelper
  5. parseSVGSegmentType
  6. nextCommandHelper
  7. nextCommand
  8. parseMoveToSegment
  9. parseLineToSegment
  10. parseLineToHorizontalSegment
  11. parseLineToVerticalSegment
  12. parseCurveToCubicSegment
  13. parseCurveToCubicSmoothSegment
  14. parseCurveToQuadraticSegment
  15. parseCurveToQuadraticSmoothSegment
  16. parseArcToSegmentHelper
  17. parseArcToSegment

/*
 * Copyright (C) Research In Motion Limited 2010. All rights reserved.
 * Copyright (C) 2013 Apple Inc. 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"

#include "core/svg/SVGPathStringSource.h"

#include "core/svg/SVGParserUtilities.h"
#include "platform/geometry/FloatPoint.h"

namespace WebCore {

SVGPathStringSource::SVGPathStringSource(const String& string)
    : m_string(string)
    , m_is8BitSource(string.is8Bit())
{
    ASSERT(!string.isEmpty());

    if (m_is8BitSource) {
        m_current.m_character8 = string.characters8();
        m_end.m_character8 = m_current.m_character8 + string.length();
    } else {
        m_current.m_character16 = string.characters16();
        m_end.m_character16 = m_current.m_character16 + string.length();
    }
}

bool SVGPathStringSource::hasMoreData() const
{
    if (m_is8BitSource)
        return m_current.m_character8 < m_end.m_character8;
    return m_current.m_character16 < m_end.m_character16;
}

bool SVGPathStringSource::moveToNextToken()
{
    if (m_is8BitSource)
        return skipOptionalSVGSpaces(m_current.m_character8, m_end.m_character8);
    return skipOptionalSVGSpaces(m_current.m_character16, m_end.m_character16);
}

template <typename CharacterType>
static bool parseSVGSegmentTypeHelper(const CharacterType*& current, SVGPathSegType& pathSegType)
{
    switch (*(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;
}

bool SVGPathStringSource::parseSVGSegmentType(SVGPathSegType& pathSegType)
{
    if (m_is8BitSource)
        return parseSVGSegmentTypeHelper(m_current.m_character8, pathSegType);
    return parseSVGSegmentTypeHelper(m_current.m_character16, pathSegType);
}

template <typename CharacterType>
static bool nextCommandHelper(const CharacterType*& current, SVGPathSegType previousCommand, SVGPathSegType& nextCommand)
{
    // Check for remaining coordinates in the current command.
    if ((*current == '+' || *current == '-' || *current == '.' || (*current >= '0' && *current <= '9'))
        && previousCommand != PathSegClosePath) {
        if (previousCommand == PathSegMoveToAbs) {
            nextCommand = PathSegLineToAbs;
            return true;
        }
        if (previousCommand == PathSegMoveToRel) {
            nextCommand = PathSegLineToRel;
            return true;
        }
        nextCommand = previousCommand;
        return true;
    }

    return false;
}

SVGPathSegType SVGPathStringSource::nextCommand(SVGPathSegType previousCommand)
{
    SVGPathSegType nextCommand;
    if (m_is8BitSource) {
        if (nextCommandHelper(m_current.m_character8, previousCommand, nextCommand))
            return nextCommand;
    } else {
        if (nextCommandHelper(m_current.m_character16, previousCommand, nextCommand))
            return nextCommand;
    }

    parseSVGSegmentType(nextCommand);
    return nextCommand;
}

bool SVGPathStringSource::parseMoveToSegment(FloatPoint& targetPoint)
{
    if (m_is8BitSource)
        return parseFloatPoint(m_current.m_character8, m_end.m_character8, targetPoint);
    return parseFloatPoint(m_current.m_character16, m_end.m_character16, targetPoint);
}

bool SVGPathStringSource::parseLineToSegment(FloatPoint& targetPoint)
{
    if (m_is8BitSource)
        return parseFloatPoint(m_current.m_character8, m_end.m_character8, targetPoint);
    return parseFloatPoint(m_current.m_character16, m_end.m_character16, targetPoint);
}

bool SVGPathStringSource::parseLineToHorizontalSegment(float& x)
{
    if (m_is8BitSource)
        return parseNumber(m_current.m_character8, m_end.m_character8, x);
    return parseNumber(m_current.m_character16, m_end.m_character16, x);
}

bool SVGPathStringSource::parseLineToVerticalSegment(float& y)
{
    if (m_is8BitSource)
        return parseNumber(m_current.m_character8, m_end.m_character8, y);
    return parseNumber(m_current.m_character16, m_end.m_character16, y);
}

bool SVGPathStringSource::parseCurveToCubicSegment(FloatPoint& point1, FloatPoint& point2, FloatPoint& targetPoint)
{
    if (m_is8BitSource)
        return parseFloatPoint3(m_current.m_character8, m_end.m_character8, point1, point2, targetPoint);
    return parseFloatPoint3(m_current.m_character16, m_end.m_character16, point1, point2, targetPoint);
}

bool SVGPathStringSource::parseCurveToCubicSmoothSegment(FloatPoint& point1, FloatPoint& targetPoint)
{
    if (m_is8BitSource)
        return parseFloatPoint2(m_current.m_character8, m_end.m_character8, point1, targetPoint);
    return parseFloatPoint2(m_current.m_character16, m_end.m_character16, point1, targetPoint);
}

bool SVGPathStringSource::parseCurveToQuadraticSegment(FloatPoint& point2, FloatPoint& targetPoint)
{
    if (m_is8BitSource)
        return parseFloatPoint2(m_current.m_character8, m_end.m_character8, point2, targetPoint);
    return parseFloatPoint2(m_current.m_character16, m_end.m_character16, point2, targetPoint);
}

bool SVGPathStringSource::parseCurveToQuadraticSmoothSegment(FloatPoint& targetPoint)
{
    if (m_is8BitSource)
        return parseFloatPoint(m_current.m_character8, m_end.m_character8, targetPoint);
    return parseFloatPoint(m_current.m_character16, m_end.m_character16, targetPoint);
}

template <typename CharacterType>
static bool parseArcToSegmentHelper(const CharacterType*& current, const CharacterType* end, float& rx, float& ry, float& angle, bool& largeArc, bool& sweep, FloatPoint& targetPoint)
{
    float toX;
    float toY;
    if (!parseNumber(current, end, rx)
        || !parseNumber(current, end, ry)
        || !parseNumber(current, end, angle)
        || !parseArcFlag(current, end, largeArc)
        || !parseArcFlag(current, end, sweep)
        || !parseNumber(current, end, toX)
        || !parseNumber(current, 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)
{
    if (m_is8BitSource)
        return parseArcToSegmentHelper(m_current.m_character8, m_end.m_character8, rx, ry, angle, largeArc, sweep, targetPoint);
    return parseArcToSegmentHelper(m_current.m_character16, m_end.m_character16, rx, ry, angle, largeArc, sweep, targetPoint);
}

} // namespace blink

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