public FunctionDeclarationTree ParseFunctionDeclaration()
{
FunctionDeclarationTree function = new FunctionDeclarationTree();
Match(TokenType.Let);
function.Token = Match(TokenType.Identifier);
Match(TokenType.OpenParenthesis);
function.Parameters = ParseParameterList();
Match(TokenType.CloseParenthesis);
Match(TokenType.Assignment);
function.Expression = ParseExpression();
Match(TokenType.SemiColon);
return(function);
}
public virtual List <CodeErrorException> TypeCheckFunctionDeclaration(FunctionDeclarationTree tree)
{
List <CodeErrorException> errors = new List <CodeErrorException>();
if (tree.Parameters.Count != 1)
{
errors.Add(
new CodeErrorException(
tree.Token.Line,
tree.Token.StartPosition,
tree.Token.EndPosition,
string.Format(
"Function declaration '{0}' must be single variable.",
tree.Token.Value
)
)
);
}
FunctionParameterName = tree.Parameters[0].Value;
errors.AddRange(TypeCheckExpression(tree.Expression));
return(errors);
}