public static bool ParseSignature(TokenStream tokenStream, StructList <LambdaArgument> signature)
{
ExpressionParser parser = new ExpressionParser(tokenStream);
bool retn = parser.ParseLambdaSignature(ref signature);
parser.Release();
if (!retn)
{
signature.Clear();
}
return(retn);
}
private bool ParseLambdaExpression(ref ASTNode node)
{
if (tokenStream.Current != ExpressionTokenType.ParenOpen)
{
return(false);
}
int advance = tokenStream.FindMatchingIndex(ExpressionTokenType.ParenOpen, ExpressionTokenType.ParenClose);
if (advance < 0)
{
return(false);
}
if (!tokenStream.HasTokenAt(advance + 1))
{
return(false);
}
if (tokenStream.Peek(advance + 1) != ExpressionTokenType.LambdaArrow)
{
return(false);
}
StructList <LambdaArgument> signatureList = StructList <LambdaArgument> .GetMinSize(4);
if (advance != 1)
{
ExpressionParser subParser = CreateSubParser(advance);
if (!subParser.ParseLambdaSignature(ref signatureList))
{
return(false);
}
tokenStream.Advance(); // step over =>
}
else
{
tokenStream.Advance(3); // 1 = ( 2 = ) 3 = =>
}
ASTNode body = null;
body = ParseLoop(); // todo -- not sure how dangerous this might be
node = ASTNode.LambdaExpressionNode(signatureList, body);
return(true);
}