private static Boolean MarkState(Boolean hasMode,
ref CoordinateParserState state)
{
state.HasMore = hasMode;
++state.CharsPosition;
return(hasMode);
}
private ISvgImage Parse(Double width,
Double height,
String path)
{
var segments = new SvgPathSegmentList();
var pathTrimmed = path.TrimEnd();
var commandStart = 0;
var pathLength = pathTrimmed.Length;
for (var i = 0; i < pathLength; ++i)
{
var currentChar = pathTrimmed[i];
if (Char.IsLetter(currentChar) && currentChar != 'e' && currentChar != 'E'
) // e is used in scientific notiation. but not svg path
{
var start = commandStart;
var length = i - commandStart;
var command = pathTrimmed.Substring(start, length).Trim();
commandStart = i;
if (command.Length > 0)
{
var commandSetTrimmed = pathTrimmed.Substring(start, length).Trim();
var state = new CoordinateParserState(ref commandSetTrimmed);
CreatePathSegments(commandSetTrimmed[0], segments, state, commandSetTrimmed);
}
if (pathLength == i + 1)
{
var commandSetTrimmed = pathTrimmed.Substring(i, 1).Trim();
var state = new CoordinateParserState(ref commandSetTrimmed);
CreatePathSegments(commandSetTrimmed[0], segments, state, commandSetTrimmed);
}
}
else if (pathLength == i + 1)
{
var start = commandStart;
var length = i - commandStart + 1;
var command = pathTrimmed.Substring(start, length).Trim();
if (command.Length > 0)
{
var commandSetTrimmed = pathTrimmed.Substring(start, length).Trim();
var state = new CoordinateParserState(ref commandSetTrimmed);
CreatePathSegments(commandSetTrimmed[0], segments, state, commandSetTrimmed);
}
}
}
return(new SvgImage(width, height, segments, _imageProvider));
}
//public static Boolean TryGetBool(out Boolean result,
// ref ReadOnlySpan<Char> chars,
// ref CoordinateParserState state)
//{
// var charsLength = chars.Length;
// while (state.CharsPosition < charsLength && state.HasMore)
// {
// switch (state.CurrNumState)
// {
// case NumState.Separator:
// var currentChar = chars[state.CharsPosition];
// if (IsCoordSeparator(currentChar))
// state.NewNumState = NumState.Separator;
// else if (currentChar == '0')
// {
// result = false;
// state.NewNumState = NumState.Separator;
// state.Position = state.CharsPosition + 1;
// return MarkState(true, ref state);
// }
// else if (currentChar == '1')
// {
// result = true;
// state.NewNumState = NumState.Separator;
// state.Position = state.CharsPosition + 1;
// return MarkState(true, ref state);
// }
// else
// {
// result = false;
// return MarkState(false, ref state);
// }
// break;
// default:
// result = false;
// return MarkState(false, ref state);
// }
// ++state.CharsPosition;
// }
// result = false;
// return MarkState(false, ref state);
//}
public static Boolean TryGetBool(out Boolean result,
ref String chars,
ref CoordinateParserState state)
{
var charsLength = chars.Length;
while (state.CharsPosition < charsLength && state.HasMore)
{
switch (state.CurrNumState)
{
case NumState.Separator:
var currentChar = chars[state.CharsPosition];
if (IsCoordSeparator(currentChar))
{
state.NewNumState = NumState.Separator;
}
else if (currentChar == '0')
{
result = false;
state.NewNumState = NumState.Separator;
state.Position = state.CharsPosition + 1;
return(MarkState(true, ref state));
}
else if (currentChar == '1')
{
result = true;
state.NewNumState = NumState.Separator;
state.Position = state.CharsPosition + 1;
return(MarkState(true, ref state));
}
else
{
result = false;
return(MarkState(false, ref state));
}
break;
default:
result = false;
return(MarkState(false, ref state));
}
++state.CharsPosition;
}
result = false;
return(MarkState(false, ref state));
}
//public static Boolean TryGetFloat(out Single result,
// ref ReadOnlySpan<Char> chars,
// ref CoordinateParserState state)
//{
// var charsLength = chars.Length;
// while (state.CharsPosition < charsLength && state.HasMore)
// {
// var currentChar = chars[state.CharsPosition];
// switch (state.CurrNumState)
// {
// case NumState.Separator:
// if (Char.IsNumber(currentChar))
// state.NewNumState = NumState.Integer;
// else if (IsCoordSeparator(currentChar))
// state.NewNumState = NumState.Separator;
// else
// switch (currentChar)
// {
// case '.':
// state.NewNumState = NumState.DecPlace;
// break;
// case '+':
// case '-':
// state.NewNumState = NumState.Prefix;
// break;
// default:
// state.NewNumState = NumState.Invalid;
// break;
// }
// break;
// case NumState.Prefix:
// if (Char.IsNumber(currentChar))
// state.NewNumState = NumState.Integer;
// else if (currentChar == '.')
// state.NewNumState = NumState.DecPlace;
// else
// state.NewNumState = NumState.Invalid;
// break;
// case NumState.Integer:
// if (Char.IsNumber(currentChar))
// state.NewNumState = NumState.Integer;
// else if (IsCoordSeparator(currentChar))
// state.NewNumState = NumState.Separator;
// else
// switch (currentChar)
// {
// case '.':
// state.NewNumState = NumState.DecPlace;
// break;
// case 'E':
// case 'e':
// state.NewNumState = NumState.Exponent;
// break;
// case '+':
// case '-':
// state.NewNumState = NumState.Prefix;
// break;
// default:
// state.NewNumState = NumState.Invalid;
// break;
// }
// break;
// case NumState.DecPlace:
// if (Char.IsNumber(currentChar))
// state.NewNumState = NumState.Fraction;
// else if (IsCoordSeparator(currentChar))
// state.NewNumState = NumState.Separator;
// else
// switch (currentChar)
// {
// case 'E':
// case 'e':
// state.NewNumState = NumState.Exponent;
// break;
// case '+':
// case '-':
// state.NewNumState = NumState.Prefix;
// break;
// default:
// state.NewNumState = NumState.Invalid;
// break;
// }
// break;
// case NumState.Fraction:
// if (Char.IsNumber(currentChar))
// state.NewNumState = NumState.Fraction;
// else if (IsCoordSeparator(currentChar))
// state.NewNumState = NumState.Separator;
// else
// switch (currentChar)
// {
// case '.':
// state.NewNumState = NumState.DecPlace;
// break;
// case 'E':
// case 'e':
// state.NewNumState = NumState.Exponent;
// break;
// case '+':
// case '-':
// state.NewNumState = NumState.Prefix;
// break;
// default:
// state.NewNumState = NumState.Invalid;
// break;
// }
// break;
// case NumState.Exponent:
// if (Char.IsNumber(currentChar))
// state.NewNumState = NumState.ExpValue;
// else if (IsCoordSeparator(currentChar))
// state.NewNumState = NumState.Invalid;
// else
// switch (currentChar)
// {
// case '+':
// case '-':
// state.NewNumState = NumState.ExpPrefix;
// break;
// default:
// state.NewNumState = NumState.Invalid;
// break;
// }
// break;
// case NumState.ExpPrefix:
// if (Char.IsNumber(currentChar))
// state.NewNumState = NumState.ExpValue;
// else
// state.NewNumState = NumState.Invalid;
// break;
// case NumState.ExpValue:
// if (Char.IsNumber(currentChar))
// state.NewNumState = NumState.ExpValue;
// else if (IsCoordSeparator(currentChar))
// state.NewNumState = NumState.Separator;
// else
// switch (currentChar)
// {
// case '.':
// state.NewNumState = NumState.DecPlace;
// break;
// case '+':
// case '-':
// state.NewNumState = NumState.Prefix;
// break;
// default:
// state.NewNumState = NumState.Invalid;
// break;
// }
// break;
// }
// if (state.CurrNumState != NumState.Separator && state.NewNumState < state.CurrNumState)
// {
// var value = chars.Slice(state.Position, state.CharsPosition - state.Position);
// result = StringParser.ToFloat(ref value);
// state.Position = state.CharsPosition;
// state.CurrNumState = state.NewNumState;
// return MarkState(true, ref state);
// }
// if (state.NewNumState != state.CurrNumState && state.CurrNumState == NumState.Separator)
// state.Position = state.CharsPosition;
// if (state.NewNumState == NumState.Invalid)
// {
// result = Single.MinValue;
// return MarkState(false, ref state);
// }
// state.CurrNumState = state.NewNumState;
// ++state.CharsPosition;
// }
// if (state.CurrNumState == NumState.Separator || !state.HasMore || state.Position >= charsLength)
// {
// result = Single.MinValue;
// return MarkState(false, ref state);
// }
// {
// var value = chars.Slice(state.Position, charsLength - state.Position);
// result = StringParser.ToFloat(ref value);
// state.Position = charsLength;
// return MarkState(true, ref state);
// }
//}
public static Boolean TryGetFloat(out Single result,
ref String chars,
ref CoordinateParserState state)
{
var charsLength = chars.Length;
while (state.CharsPosition < charsLength && state.HasMore)
{
var currentChar = chars[state.CharsPosition];
switch (state.CurrNumState)
{
case NumState.Separator:
if (Char.IsNumber(currentChar))
{
state.NewNumState = NumState.Integer;
}
else if (IsCoordSeparator(currentChar))
{
state.NewNumState = NumState.Separator;
}
else
{
switch (currentChar)
{
case '.':
state.NewNumState = NumState.DecPlace;
break;
case '+':
case '-':
state.NewNumState = NumState.Prefix;
break;
default:
state.NewNumState = NumState.Invalid;
break;
}
}
break;
case NumState.Prefix:
if (Char.IsNumber(currentChar))
{
state.NewNumState = NumState.Integer;
}
else if (currentChar == '.')
{
state.NewNumState = NumState.DecPlace;
}
else
{
state.NewNumState = NumState.Invalid;
}
break;
case NumState.Integer:
if (Char.IsNumber(currentChar))
{
state.NewNumState = NumState.Integer;
}
else if (IsCoordSeparator(currentChar))
{
state.NewNumState = NumState.Separator;
}
else
{
switch (currentChar)
{
case '.':
state.NewNumState = NumState.DecPlace;
break;
case 'E':
case 'e':
state.NewNumState = NumState.Exponent;
break;
case '+':
case '-':
state.NewNumState = NumState.Prefix;
break;
default:
state.NewNumState = NumState.Invalid;
break;
}
}
break;
case NumState.DecPlace:
if (Char.IsNumber(currentChar))
{
state.NewNumState = NumState.Fraction;
}
else if (IsCoordSeparator(currentChar))
{
state.NewNumState = NumState.Separator;
}
else
{
switch (currentChar)
{
case 'E':
case 'e':
state.NewNumState = NumState.Exponent;
break;
case '+':
case '-':
state.NewNumState = NumState.Prefix;
break;
default:
state.NewNumState = NumState.Invalid;
break;
}
}
break;
case NumState.Fraction:
if (Char.IsNumber(currentChar))
{
state.NewNumState = NumState.Fraction;
}
else if (IsCoordSeparator(currentChar))
{
state.NewNumState = NumState.Separator;
}
else
{
switch (currentChar)
{
case '.':
state.NewNumState = NumState.DecPlace;
break;
case 'E':
case 'e':
state.NewNumState = NumState.Exponent;
break;
case '+':
case '-':
state.NewNumState = NumState.Prefix;
break;
default:
state.NewNumState = NumState.Invalid;
break;
}
}
break;
case NumState.Exponent:
if (Char.IsNumber(currentChar))
{
state.NewNumState = NumState.ExpValue;
}
else if (IsCoordSeparator(currentChar))
{
state.NewNumState = NumState.Invalid;
}
else
{
switch (currentChar)
{
case '+':
case '-':
state.NewNumState = NumState.ExpPrefix;
break;
default:
state.NewNumState = NumState.Invalid;
break;
}
}
break;
case NumState.ExpPrefix:
if (Char.IsNumber(currentChar))
{
state.NewNumState = NumState.ExpValue;
}
else
{
state.NewNumState = NumState.Invalid;
}
break;
case NumState.ExpValue:
if (Char.IsNumber(currentChar))
{
state.NewNumState = NumState.ExpValue;
}
else if (IsCoordSeparator(currentChar))
{
state.NewNumState = NumState.Separator;
}
else
{
switch (currentChar)
{
case '.':
state.NewNumState = NumState.DecPlace;
break;
case '+':
case '-':
state.NewNumState = NumState.Prefix;
break;
default:
state.NewNumState = NumState.Invalid;
break;
}
}
break;
}
if (state.CurrNumState != NumState.Separator && state.NewNumState < state.CurrNumState)
{
var value = chars.Substring(state.Position, state.CharsPosition - state.Position);
result = Single.Parse(value, NumberStyles.Float, CultureInfo.InvariantCulture);
//result = StringParser.ToFloat(ref value);
state.Position = state.CharsPosition;
state.CurrNumState = state.NewNumState;
return(MarkState(true, ref state));
}
if (state.NewNumState != state.CurrNumState && state.CurrNumState == NumState.Separator)
{
state.Position = state.CharsPosition;
}
if (state.NewNumState == NumState.Invalid)
{
result = Single.MinValue;
return(MarkState(false, ref state));
}
state.CurrNumState = state.NewNumState;
++state.CharsPosition;
}
if (state.CurrNumState == NumState.Separator || !state.HasMore || state.Position >= charsLength)
{
result = Single.MinValue;
return(MarkState(false, ref state));
}
{
var value = chars.Substring(state.Position, charsLength - state.Position);
//result = StringParser.ToFloat(ref value);
result = Single.Parse(value, NumberStyles.Float, CultureInfo.InvariantCulture);
state.Position = charsLength;
return(MarkState(true, ref state));
}
}
private static void CreatePathSegments(Char command,
SvgPathSegmentList segments,
CoordinateParserState state,
String chars)
{
var isRelative = Char.IsLower(command);
// http://www.w3.org/TR/SVG11/paths.html#PathDataGeneralInformation
switch (command)
{
case 'M': // moveto
case 'm': // relative moveto
{
if (CoordinateParser.TryGetFloat(out var coords0, ref chars, ref state) &&
CoordinateParser.TryGetFloat(out var coords1, ref chars, ref state))
{
var mov = new SvgMoveToSegment(
ToAbsolute(coords0, coords1, segments, isRelative));
segments.Add(mov);
//yield return mov;
}
while (CoordinateParser.TryGetFloat(out coords0, ref chars, ref state) &&
CoordinateParser.TryGetFloat(out coords1, ref chars, ref state))
{
var line = new SvgLineSegment(segments.Last.End,
ToAbsolute(coords0, coords1, segments, isRelative));
segments.Add(line);
//yield return line;
}
}
break;
case 'A': // elliptical arc
case 'a': // relative elliptical arc
{
while (CoordinateParser.TryGetFloat(out var coords0, ref chars, ref state) &&
CoordinateParser.TryGetFloat(out var coords1, ref chars, ref state) &&
CoordinateParser.TryGetFloat(out var coords2, ref chars, ref state) &&
CoordinateParser.TryGetBool(out var size, ref chars, ref state) &&
CoordinateParser.TryGetBool(out var sweep, ref chars, ref state) &&
CoordinateParser.TryGetFloat(out var coords3, ref chars, ref state) &&
CoordinateParser.TryGetFloat(out var coords4, ref chars, ref state))
{
// A|a rx ry x-axis-rotation large-arc-flag sweep-flag x y
var arc = new SvgArcSegment(
segments.Last.End,
coords0,
coords1,
coords2,
size ? SvgArcSize.Large : SvgArcSize.Small,
sweep ? SvgArcSweep.Positive : SvgArcSweep.Negative,
ToAbsolute(coords3, coords4, segments, isRelative));
segments.Add(arc);
//yield return arc;
}
}
break;
case 'L': // lineto
case 'l': // relative lineto
{
while (CoordinateParser.TryGetFloat(out var coords0, ref chars, ref state) &&
CoordinateParser.TryGetFloat(out var coords1, ref chars, ref state))
{
var line = new SvgLineSegment(
segments.Last.End,
ToAbsolute(coords0, coords1, segments, isRelative));
segments.Add(line);
//yield return line;
}
}
break;
case 'H': // horizontal lineto
case 'h': // relative horizontal lineto
{
while (CoordinateParser.TryGetFloat(out var coords0, ref chars, ref state))
{
var line = new SvgLineSegment(
segments.Last.End,
ToAbsolute(coords0, segments.Last.End.Y, segments, isRelative, false));
segments.Add(line);
//yield return line;
}
}
break;
case 'V': // vertical lineto
case 'v': // relative vertical lineto
{
while (CoordinateParser.TryGetFloat(out var coords0, ref chars, ref state))
{
var line = new SvgLineSegment(
segments.Last.End,
ToAbsolute(segments.Last.End.X, coords0, segments, false, isRelative));
segments.Add(line);
//yield return line;
}
}
break;
case 'Q': // quadratic bézier curveto
case 'q': // relative quadratic bézier curveto
{
while (CoordinateParser.TryGetFloat(out var coords0, ref chars, ref state) &&
CoordinateParser.TryGetFloat(out var coords1, ref chars, ref state) &&
CoordinateParser.TryGetFloat(out var coords2, ref chars, ref state) &&
CoordinateParser.TryGetFloat(out var coords3, ref chars, ref state))
{
var quad = new SvgQuadraticCurveSegment(
segments.Last.End,
ToAbsolute(coords0, coords1, segments, isRelative),
ToAbsolute(coords2, coords3, segments, isRelative));
segments.Add(quad);
//yield return quad;
}
}
break;
case 'T': // shorthand/smooth quadratic bézier curveto
case 't': // relative shorthand/smooth quadratic bézier curveto
{
while (CoordinateParser.TryGetFloat(out var coords0, ref chars, ref state) &&
CoordinateParser.TryGetFloat(out var coords1, ref chars, ref state))
{
var lastQuadCurve = segments.Last as SvgQuadraticCurveSegment;
var controlPoint = lastQuadCurve != null
? Reflect(lastQuadCurve.ControlPoint, segments.Last.End)
: segments.Last.End;
var quad = new SvgQuadraticCurveSegment(
segments.Last.End,
controlPoint,
ToAbsolute(coords0, coords1, segments, isRelative));
segments.Add(quad);
//yield return quad;
}
}
break;
case 'C': // curveto
case 'c': // relative curveto
{
while (CoordinateParser.TryGetFloat(out var coords0, ref chars, ref state) &&
CoordinateParser.TryGetFloat(out var coords1, ref chars, ref state) &&
CoordinateParser.TryGetFloat(out var coords2, ref chars, ref state) &&
CoordinateParser.TryGetFloat(out var coords3, ref chars, ref state) &&
CoordinateParser.TryGetFloat(out var coords4, ref chars, ref state) &&
CoordinateParser.TryGetFloat(out var coords5, ref chars, ref state))
{
var cube = new SvgCubicCurveSegment(
segments.Last.End,
ToAbsolute(coords0, coords1, segments, isRelative),
ToAbsolute(coords2, coords3, segments, isRelative),
ToAbsolute(coords4, coords5, segments, isRelative));
segments.Add(cube);
//yield return cube;
}
}
break;
case 'S': // shorthand/smooth curveto
case 's': // relative shorthand/smooth curveto
{
while (CoordinateParser.TryGetFloat(out var coords0, ref chars, ref state) &&
CoordinateParser.TryGetFloat(out var coords1, ref chars, ref state) &&
CoordinateParser.TryGetFloat(out var coords2, ref chars, ref state) &&
CoordinateParser.TryGetFloat(out var coords3, ref chars, ref state))
{
var lastCubicCurve = segments.Last as SvgCubicCurveSegment;
var controlPoint = lastCubicCurve != null
? Reflect(lastCubicCurve.SecondControlPoint, segments.Last.End)
: segments.Last.End;
var cube = new SvgCubicCurveSegment(
segments.Last.End,
controlPoint,
ToAbsolute(coords0, coords1, segments, isRelative),
ToAbsolute(coords2, coords3, segments, isRelative));
segments.Add(cube);
//yield return cube;
}
}
break;
case 'Z': // closepath
case 'z': // relative closepath
{
var bye = new SvgClosePathSegment();
segments.Add(bye);
//yield return bye;
}
break;
}
}
