private static ASTFunction ParseTopLevelExpression()
{
ASTExpression e = ParseExpression();
if (e == null)
{
return(null);
}
// create an anonymous prototype to evaluate the expression
ASTPrototype proto = new ASTPrototype("__proto", new List <string>());
return(new ASTFunction(proto, e));
}
private static ASTFunction ParseDefinition()
{
NextToken(); // eat the 'def' keyword
ASTPrototype proto = ParsePrototype(); // parse the definition
if (proto == null)
{
return(null);
}
ASTExpression body = ParseExpression(); // and the body
if (body != null)
{
return(new ASTFunction(proto, body));
}
return(null);
}
public ASTFunction(ASTPrototype prototype, ASTExpression body)
{
Prototype = prototype;
Body = body;
}