/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "SVGMotionSMILPathUtils.h"

#include "nsCharSeparatedTokenizer.h"

#include "nsContentUtils.h" // for NS_ENSURE_FINITE2

#include "SVGContentUtils.h"

#include "SVGLength.h"

using namespace mozilla::gfx;

namespace mozilla {

//----------------------------------------------------------------------

// PathGenerator methods

// For the dummy 'from' value used in pure by-animation & to-animation

void

SVGMotionSMILPathUtils::PathGenerator::

  MoveToOrigin()

{

  MOZ_ASSERT(!mHaveReceivedCommands,

             "Not expecting requests for mid-path MoveTo commands");

  mHaveReceivedCommands = true;

  mPathBuilder->MoveTo(Point(0, 0));

}

// For 'from' and the first entry in 'values'.

bool

SVGMotionSMILPathUtils::PathGenerator::

  MoveToAbsolute(const nsAString& aCoordPairStr)

{

  MOZ_ASSERT(!mHaveReceivedCommands,

             "Not expecting requests for mid-path MoveTo commands");

  mHaveReceivedCommands = true;

  float xVal, yVal;

  if (!ParseCoordinatePair(aCoordPairStr, xVal, yVal)) {

    return false;

  }

  mPathBuilder->MoveTo(Point(xVal, yVal));

  return true;

}

// For 'to' and every entry in 'values' except the first.

bool

SVGMotionSMILPathUtils::PathGenerator::

  LineToAbsolute(const nsAString& aCoordPairStr, double& aSegmentDistance)

{

  mHaveReceivedCommands = true;

  float xVal, yVal;

  if (!ParseCoordinatePair(aCoordPairStr, xVal, yVal)) {

    return false;

  }

  Point initialPoint = mPathBuilder->CurrentPoint();

  mPathBuilder->LineTo(Point(xVal, yVal));

  aSegmentDistance = NS_hypot(initialPoint.x - xVal, initialPoint.y -yVal);

  return true;

}

// For 'by'.

bool

SVGMotionSMILPathUtils::PathGenerator::

  LineToRelative(const nsAString& aCoordPairStr, double& aSegmentDistance)

{

  mHaveReceivedCommands = true;

  float xVal, yVal;

  if (!ParseCoordinatePair(aCoordPairStr, xVal, yVal)) {

    return false;

  }

  mPathBuilder->LineTo(mPathBuilder->CurrentPoint() + Point(xVal, yVal));

  aSegmentDistance = NS_hypot(xVal, yVal);

  return true;

}

already_AddRefed<Path>

SVGMotionSMILPathUtils::PathGenerator::GetResultingPath()

{

  return mPathBuilder->Finish();

}

//----------------------------------------------------------------------

// Helper / protected methods

bool

SVGMotionSMILPathUtils::PathGenerator::

  ParseCoordinatePair(const nsAString& aCoordPairStr,

                      float& aXVal, float& aYVal)

{

  nsCharSeparatedTokenizerTemplate<nsContentUtils::IsHTMLWhitespace>

    tokenizer(aCoordPairStr, ',',

              nsCharSeparatedTokenizer::SEPARATOR_OPTIONAL);

  SVGLength x, y;

  if (!tokenizer.hasMoreTokens() ||

      !x.SetValueFromString(tokenizer.nextToken())) {

    return false;

  }

  if (!tokenizer.hasMoreTokens() ||

      !y.SetValueFromString(tokenizer.nextToken())) {

    return false;

  }

  if (tokenizer.separatorAfterCurrentToken() ||  // Trailing comma.

      tokenizer.hasMoreTokens()) {               // More text remains

    return false;

  }

  float xRes = x.GetValueInUserUnits(mSVGElement, SVGContentUtils::X);

  float yRes = y.GetValueInUserUnits(mSVGElement, SVGContentUtils::Y);

  NS_ENSURE_FINITE2(xRes, yRes, false);

  aXVal = xRes;

  aYVal = yRes;

  return true;

}

//----------------------------------------------------------------------

// MotionValueParser methods

bool

SVGMotionSMILPathUtils::MotionValueParser::

  Parse(const nsAString& aValueStr)

{

  bool success;

  if (!mPathGenerator->HaveReceivedCommands()) {

    // Interpret first value in "values" attribute as the path's initial MoveTo

    success = mPathGenerator->MoveToAbsolute(aValueStr);

    if (success) {

      success = !!mPointDistances->AppendElement(0.0, fallible);

    }

  } else {

    double dist;

    success = mPathGenerator->LineToAbsolute(aValueStr, dist);

    if (success) {

      mDistanceSoFar += dist;

      success = !!mPointDistances->AppendElement(mDistanceSoFar, fallible);

    }

  }

  return success;

}

} // namespace mozilla