public Attribution ParseAttribution(TokenIdentifier functionIdentifier)
{
if (Peek() != functionIdentifier)
{
throw new ParseFatalException($"The current node ({Peek().ToString()}) is not the same as the required ({functionIdentifier.ToString()}). The parser is about to possibly parse an attribution to a variable, but it cannot determine the variable name.", this);
}
var next = ReadNext();
if (next is TokenAttribution) //good chances it's an attribution
{
next = ReadNext();
var expr = ParseExpression(false);
var tok = Peek();
if (tok is TokenNewLine || tok is TokenEOF)
{
return(new Attribution(functionIdentifier, expr));
}
else
{
throw new ParseException("Expected a newline or end of file, got " + tok.ToString(), this);
}
}
else
{
return(null); //it's not an attribution. What is the parser expecting? Return null and let the caller decide
}
}
public Call ParseFunctionCall(TokenIdentifier functionIdentifier)
{
if (Peek() != functionIdentifier)
{
throw new ParseFatalException($"The current node ({Peek().ToString()}) is not the same as the required ({functionIdentifier.ToString()}). The parser is about to possibly parse a function call, but it cannot determine the function name.", this);
}
var next = ReadNext();
if (next is TokenOpenParen)
{
//good chance it will be a function call
//then, the next it's either a close paren or an expression
next = ReadNext();
if (next is TokenCloseParen) //a close paren creates a function call without arguments
{
return(new Call(functionIdentifier.Identifier));
}
else
{
var exprList = ParseExpressionList(true);
return(new Call(functionIdentifier.Identifier, exprList));
}
}
else
{
return(null); //it's not a function call. What is the parser expecting? Return null and let the caller decide
}
}