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/**
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*
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* OOAS Compiler (Deprecated)
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*
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* Copyright 2015, Institute for Software Technology, Graz University of
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* Technology. Portions are copyright 2015 by the AIT Austrian Institute
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* of Technology. All rights reserved.
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*
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* SEE THE "LICENSE" FILE FOR THE TERMS UNDER WHICH THIS FILE IS PROVIDED.
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*
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* Please notice that this version of the OOAS compiler is considered de-
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* precated. Only the Java version is maintained.
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*
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* Contributors:
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* Willibald Krenn (TU Graz/AIT)
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* Stefan Tiran (TU Graz/AIT)
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*/
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using System;
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using System.Collections.Generic;
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using System.Text;
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namespace TUG.Mogentes
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{
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/// <summary>
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/// Requires: ResolveOpaque
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///
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/// Checks whether types have been defined in a sane way (no self refs etc.)
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/// </summary>
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public sealed class OoaTypesVisitor : OoaCompleteAstTraversalVisitor
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{
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private void Error(UlyssesType aType, string p)
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{
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ParserError error = new ParserError(m_ParserState.filename,
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aType.identifier.line, aType.identifier.column, p);
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m_ParserState.AddErrorMessage(error);
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}
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C5.HashSet<UlyssesType> typesSeen = new C5.HashSet<UlyssesType>();
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public override void visit(MainModule mainModule)
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{
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foreach (var x in mainModule.symbolTable.symbolList)
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{
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if (x.kind == IdentifierKind.TypeIdentifier)
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x.Accept(this);
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}
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}
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protected override void VisitAstElement(IAst element, IAst parent)
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{
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if (element.nodeType != AstNodeTypeEnum.type)
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m_visited.Add(element);
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base.VisitAstElement(element, parent);
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}
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public override void visit(TypeIdentifier typeIdentifier)
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{
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typesSeen.Clear();
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base.visit(typeIdentifier);
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}
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private delegate void Action<T>(T param) where T : UlyssesType;
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/* Does the check for recursion */
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private void CheckForRecursion<T>(T aType, string Message, Action<T> toCall) where T : UlyssesType
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{
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if (typesSeen.Contains(aType))
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{
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Error(aType, Message);
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return;
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}
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typesSeen.Add(aType);
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try
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{
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toCall(aType);
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}
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finally
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{
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typesSeen.Remove(aType);
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}
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}
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/* see whether a tuple-type includes itself */
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public void HackUntilCSharp4(TupleType t)
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{ base.visit(t); }
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public override void visit(TupleType tupleType)
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{
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CheckForRecursion<TupleType>(tupleType,
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String.Format("Tuple contains itself: '{0}' (Recursive definitions not allowed.)",
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tupleType.ToString()), (x) => HackUntilCSharp4(x));
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}
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/* see whether a list-type includes itself */
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public void HackUntilCSharp4(ListType t)
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{ base.visit(t); }
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public override void visit(ListType listType)
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{
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CheckForRecursion<ListType>(listType,
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String.Format("List contains itself: '{0}' (Recursive definitions not allowed.)",
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listType.ToString()), (x) => HackUntilCSharp4(x));
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}
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/* see whether a map-type includes itself */
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public void HackUntilCSharp4(MapType t)
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{ base.visit(t); }
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public override void visit(MapType mapType)
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{
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CheckForRecursion<MapType>(mapType,
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String.Format("Map contains itself: '{0}' (Recursive definitions not allowed.)",
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mapType.ToString()), (x) => HackUntilCSharp4(x));
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}
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public override void visit(OoActionSystemType ooActionSystemType)
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{
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// do not go into classes..
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}
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public OoaTypesVisitor(ParserState aState)
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: base(aState, true)
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{
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if (aState == null)
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throw new ArgumentException();
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}
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}
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}
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