public static Ast.ComplexString ParseComplexString(TokenStream Stream, ParseContext Context)
{
System.Diagnostics.Debug.Assert(Stream.Next().Type == TokenType.Dollar);
var start = Stream.Next();
Stream.PushState(TokenStreamState.ComplexString); //Enter complex string parsing mode
Stream.Advance();
if (Stream.Next().Type != TokenType.ComplexStringQuote)
throw new CompileError("[015] Expected \"", Stream);
Stream.Advance();
var stringPieces = new List<Ast.Node>();
while (Stream.Next().Type != TokenType.ComplexStringQuote)
{
if (Stream.Next().Type == TokenType.ComplexStringPart)
{
stringPieces.Add(new Ast.StringLiteral(Stream.Next(), Stream.Next().Value));
Stream.Advance();
}
else if (Stream.Next().Type == TokenType.OpenBracket)
{
Stream.PushState(TokenStreamState.Normal); //Make sure we are parsing normally for the
Stream.Advance(); //Skip the [ //embedded expression
stringPieces.Add(ParseExpression(Stream, Context, TokenType.CloseBracket));
if (Stream.Next().Type != TokenType.CloseBracket) //Shouldn't be possible
throw new CompileError("[016] Expected ]", Stream);
Stream.PopState(); //Return to complex string parsing mode
Stream.Advance();
}
else
throw new InvalidProgramException();
}
Stream.PopState(); //Return to normal parsing mode
Stream.Advance();
return new Ast.ComplexString(start, stringPieces);
}