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);
}
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);
}