예제 #1
0
        public override Node VisitFunctionDeclaration(DustParser.FunctionDeclarationContext context)
        {
            string name = context.functionDeclarationBase().functionName().identifierName().GetText();

            FunctionModifier[]  modifiers  = context.functionDeclarationBase().functionModifier().Select(modifierContext => FunctionModifier.Parse(modifierContext.GetText())).ToArray();
            FunctionParameter[] parameters = context.functionParameterList()?.functionParameter().Select(Visit).Cast <FunctionParameter>().ToArray();

            if (visitorContext.ContainsPropety(name))
            {
                visitorContext.ErrorHandler.ThrowError(new SyntaxError($"Identifier '{name}' is already defined", context.functionDeclarationBase().functionName().GetRange()));

                return(null);
            }

            for (int i = 0; i < parameters?.Length; i++)
            {
                if (visitorContext.ContainsPropety(parameters[i].Identifier.Name))
                {
                    visitorContext.ErrorHandler.ThrowError(new SyntaxError($"Identifier '{name}' is already defined", context.functionParameterList().functionParameter(i).GetRange()));

                    return(null);
                }
            }

            DustVisitor      child      = CreateChild(parameters ?? new FunctionParameter[0]);
            List <Statement> statements = new List <Statement>();

            DustType returnType = null;

            if (context.statementBlock() != null)
            {
                foreach (DustParser.StatementContext statementContext in context.statementBlock().statement())
                {
                    Statement statement = (Statement)child.Visit(statementContext);

                    if (statement is ReturnStatement)
                    {
                        // TODO: Fix the temporary HACK by creating a Type System.
                        returnType = DustType.Number;
                    }

                    statements.Add(statement);
                }
            }

            FunctionDeclaration declaration = new FunctionDeclaration(name, modifiers, parameters ?? new FunctionParameter[0], statements.ToArray(), returnType, child.visitorContext, new Range
            {
                Start = context.GetRange().Start,
                End   = context.functionDeclarationBase().functionName().GetRange().End
            });

            visitorContext.AddFunction(declaration.Function);

            return(declaration);
        }
예제 #2
0
        private DustVisitor CreateChild(FunctionParameter[] predefindProperties)
        {
            DustVisitor visitor = new DustVisitor(new DustContext(visitorContext));

            foreach (FunctionParameter property in predefindProperties)
            {
                // fixme
                visitor.visitorContext.AddProperty(property.Identifier);
            }

            return(visitor);
        }