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);
}
/// <summary>
/// Visit a parse tree produced by <see cref="DustParser.functionDeclaration"/>.
/// <para>
/// The default implementation returns the result of calling <see cref="AbstractParseTreeVisitor{Result}.VisitChildren(IRuleNode)"/>
/// on <paramref name="context"/>.
/// </para>
/// </summary>
/// <param name="context">The parse tree.</param>
/// <return>The visitor result.</return>
public virtual Result VisitFunctionDeclaration([NotNull] DustParser.FunctionDeclarationContext context)
{
return(VisitChildren(context));
}
/// <summary>
/// Exit a parse tree produced by <see cref="DustParser.functionDeclaration"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitFunctionDeclaration([NotNull] DustParser.FunctionDeclarationContext context)
{
}
