/// <summary>
/// Parses a series of points.
/// </summary>
/// <param name="lexer">The lexer.</param>
/// <param name="diagnostics">The diagnostics.</param>
/// <returns>The list of points.</returns>
public static List <Vector2> ParsePoints(SvgPathDataLexer lexer, IDiagnosticHandler diagnostics)
{
var points = new List <Vector2>();
while (lexer.Type != TokenType.EndOfContent)
{
// Keep parsing vectors
lexer.ParseVector(diagnostics, out var p);
points.Add(p);
}
return(points);
}
/// <summary>
/// Parse Svg path.
/// </summary>
/// <param name="lexer">The lexer.</param>
/// <param name="b">The path builder.</param>
/// <param name="diagnostics">The diagnostics message handler.</param>
public static void Parse(SvgPathDataLexer lexer, PathBuilder b, IDiagnosticHandler diagnostics)
{
while (lexer.Type != TokenType.EndOfContent)
{
Vector2 h1, h2, p;
double d;
bool result = true;
if (!lexer.Branch(TokenType.Command, out var cmd))
{
diagnostics?.Post(new TokenDiagnosticMessage(cmd, SeverityLevel.Error, "DW001",
$"Could not recognize the SVG path command '{cmd.Content}'"));
break;
}
switch (cmd.Content.Span[0])
{
case 'M':
if (!lexer.ParseVector(diagnostics, out p))
{
lexer.Skip(~TokenType.Command);
continue;
}
b.MoveTo(p);
while (lexer.TryParseVector(diagnostics, new(), out p))
{
b.LineTo(p);
}
break;
case 'm':
if (!lexer.ParseVector(diagnostics, out p))
{
lexer.Skip(~TokenType.Command);
continue;
}
b.Move(p);
while (lexer.TryParseVector(diagnostics, new(), out p))
{
b.Line(p);
}
break;
case 'L':
if (!lexer.ParseVector(diagnostics, out p))
{
lexer.Skip(~TokenType.Command);
continue;
}
b.LineTo(p);
while (lexer.TryParseVector(diagnostics, new(), out p))
{
b.LineTo(p);
}
break;
case 'l':
if (!lexer.ParseVector(diagnostics, out p))
{
lexer.Skip(~TokenType.Command);
continue;
}
b.Line(p);
while (lexer.TryParseVector(diagnostics, new(), out p))
{
b.Line(p);
}
break;
case 'H':
if (!lexer.ParseCoordinate(diagnostics, out d))
{
lexer.Skip(~TokenType.Command);
continue;
}
b.HorizontalTo(d);
while (lexer.TryParseCoordinate(diagnostics, 0.0, out d))
{
b.HorizontalTo(d);
}
break;
case 'h':
if (!lexer.ParseCoordinate(diagnostics, out d))
{
lexer.Skip(~TokenType.Command);
continue;
}
b.Horizontal(d);
while (lexer.TryParseCoordinate(diagnostics, 0.0, out d))
{
b.Horizontal(d);
}
break;
case 'V':
if (!lexer.ParseCoordinate(diagnostics, out d))
{
lexer.Skip(~TokenType.Command);
continue;
}
b.VerticalTo(d);
while (lexer.TryParseCoordinate(diagnostics, 0.0, out d))
{
b.VerticalTo(d);
}
break;
case 'v':
if (!lexer.ParseCoordinate(diagnostics, out d))
{
lexer.Skip(~TokenType.Command);
continue;
}
b.Vertical(d);
while (lexer.TryParseCoordinate(diagnostics, 0.0, out d))
{
b.Vertical(d);
}
break;
case 'C':
result &= lexer.ParseVector(diagnostics, out h1);
result &= lexer.ParseVector(diagnostics, out h2);
result &= lexer.ParseVector(diagnostics, out p);
if (!result)
{
lexer.Skip(~TokenType.Command);
continue;
}
b.CurveTo(h1, h2, p);
while (lexer.TryParseVector(diagnostics, new(), out h1) &&
lexer.ParseVector(diagnostics, out h2) &&
lexer.ParseVector(diagnostics, out p))
{
b.CurveTo(h1, h2, p);
}
break;
case 'c':
result &= lexer.ParseVector(diagnostics, out h1);
result &= lexer.ParseVector(diagnostics, out h2);
result &= lexer.ParseVector(diagnostics, out p);
if (!result)
{
lexer.Skip(~TokenType.Command);
continue;
}
b.Curve(h1, h2, p);
while (lexer.TryParseVector(diagnostics, new(), out h1) &&
lexer.ParseVector(diagnostics, out h2) &&
lexer.ParseVector(diagnostics, out p))
{
b.Curve(h1, h2, p);
}
break;
case 'S':
result &= lexer.ParseVector(diagnostics, out h2);
result &= lexer.ParseVector(diagnostics, out p);
if (!result)
{
lexer.Skip(~TokenType.Command);
continue;
}
b.SmoothTo(h2, p);
while (lexer.TryParseVector(diagnostics, new(), out h2) &&
lexer.ParseVector(diagnostics, out p))
{
b.SmoothTo(h2, p);
}
break;
case 's':
result &= lexer.ParseVector(diagnostics, out h2);
result &= lexer.ParseVector(diagnostics, out p);
if (!result)
{
lexer.Skip(~TokenType.Command);
continue;
}
b.Smooth(h2, p);
while (lexer.TryParseVector(diagnostics, new(), out h2) &&
lexer.ParseVector(diagnostics, out p))
{
b.Smooth(h2, p);
}
break;
case 'Q':
result &= lexer.ParseVector(diagnostics, out h1);
result &= lexer.ParseVector(diagnostics, out p);
if (!result)
{
lexer.Skip(~TokenType.Command);
continue;
}
b.QuadCurveTo(h1, p);
while (lexer.TryParseVector(diagnostics, new(), out h1) &&
lexer.ParseVector(diagnostics, out p))
{
b.QuadCurveTo(h1, p);
}
break;
case 'q':
result &= lexer.ParseVector(diagnostics, out h1);
result &= lexer.ParseVector(diagnostics, out p);
if (!result)
{
lexer.Skip(~TokenType.Command);
continue;
}
b.QuadCurve(h1, p);
while (lexer.TryParseVector(diagnostics, new(), out h1) &&
lexer.ParseVector(diagnostics, out p))
{
b.QuadCurve(h1, p);
}
break;
case 'T':
if (!lexer.ParseVector(diagnostics, out p))
{
lexer.Skip(~TokenType.Command);
continue;
}
b.SmoothQuadTo(p);
while (lexer.TryParseVector(diagnostics, new(), out p))
{
b.SmoothQuadTo(p);
}
break;
case 't':
if (!lexer.ParseVector(diagnostics, out p))
{
lexer.Skip(~TokenType.Command);
continue;
}
b.SmoothQuad(p);
while (lexer.TryParseVector(diagnostics, new(), out p))
{
b.SmoothQuad(p);
}
break;
case 'z':
case 'Z':
b.Close();
break;
default:
diagnostics?.Post(new DiagnosticMessage(SeverityLevel.Error, "DRAW001",
$"Could not recognize path command '{cmd}'."));
break;
}
}
}
