// Main parse loop
void Parse()
{
// First, try to see if the transform is actually "no transform"
if (parseString.Trim() == "none")
{
return;
}
// Flag to report an error if a transform function ends too soon
bool allowEnd = true;
try
{
while (true)
{
// First, try to extract a command
allowEnd = true;
var function = ParseTransformFunctionType();
allowEnd = false;
switch (function)
{
case TransformFunctionType.Matrix:
{
var a = DelimitedParenthesizedSequence(6, 6);
transformFunctions.Add(TransformFunction.Matrix(a[0], a[1], a[2], a[3], a[4], a[5]));
break;
}
case TransformFunctionType.Translate:
{
var a = DelimitedParenthesizedSequence(1, 2);
transformFunctions.Add(TransformFunction.Translate(a[0], a.TryGetOr(1, 0)));
break;
}
case TransformFunctionType.Rotate:
{
var a = DelimitedParenthesizedSequence(1, 1);
transformFunctions.Add(TransformFunction.Rotate(a[0].ToRadians()));
break;
}
case TransformFunctionType.Scale:
{
var a = DelimitedParenthesizedSequence(1, 2);
transformFunctions.Add(TransformFunction.Scale(a[0], a.TryGetOr(1, a[0])));
break;
}
case TransformFunctionType.SkewX:
{
var a = DelimitedParenthesizedSequence(1, 1);
transformFunctions.Add(TransformFunction.SkewX(a[0].ToRadians()));
break;
}
case TransformFunctionType.SkewY:
{
var a = DelimitedParenthesizedSequence(1, 1);
transformFunctions.Add(TransformFunction.SkewY(a[0].ToRadians()));
break;
}
default:
// This code will never come, but the C# compiler cannot detect it
throw new ParserException("Unrecognized transform function matched!");
}
}
}
catch (EndParseException)
{
// The name says it all
if (!allowEnd)
{
throw new ParserException("Unexpected end of transform string!");
}
}
}
