root / trunk / compiler / ooasCompiler / src / org / momut / ooas / visitors / OoaTypesVisitor.java @ 7
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/**
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*
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* OOAS Compiler
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*
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* Copyright 2015, AIT Austrian Institute of Technology.
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* This code is based on the C# Version of the OOAS Compiler, which is
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* copyright 2015 by the Institute of Software Technology, Graz University
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* of Technology with portions copyright by the AIT Austrian Institute of
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* 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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* If you modify the file please update the list of contributors below to in-
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* clude your name. Please also stick to the coding convention of using TABs
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* to do the basic (block-level) indentation and spaces for anything after
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* that. (Enable the display of special chars and it should be pretty obvious
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* what this means.) Also, remove all trailing whitespace.
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*
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* Contributors:
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* Willibald Krenn (AIT)
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* Stephan Zimmerer (AIT)
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* Markus Demetz (AIT)
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* Christoph Czurda (AIT)
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*
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*/
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package org.momut.ooas.visitors; |
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import java.util.HashSet; |
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import org.momut.ooas.ast.AstNodeTypeEnum; |
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import org.momut.ooas.ast.IAst; |
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import org.momut.ooas.ast.identifiers.Identifier; |
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import org.momut.ooas.ast.identifiers.IdentifierKind; |
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import org.momut.ooas.ast.identifiers.MainModule; |
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import org.momut.ooas.ast.identifiers.TypeIdentifier; |
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import org.momut.ooas.ast.types.ListType; |
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import org.momut.ooas.ast.types.MapType; |
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import org.momut.ooas.ast.types.OoActionSystemType; |
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import org.momut.ooas.ast.types.TupleType; |
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import org.momut.ooas.ast.types.UlyssesType; |
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import org.momut.ooas.parser.ParserError; |
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import org.momut.ooas.parser.ParserState; |
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import org.momut.ooas.utils.exceptions.ArgumentException; |
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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 final class OoaTypesVisitor extends 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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HashSet<UlyssesType> typesSeen = new HashSet<UlyssesType>(); |
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@Override
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public void visit(MainModule mainModule) |
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{ |
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for (Identifier x: 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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@Override
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protected 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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super.VisitAstElement(element, parent);
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} |
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@Override
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public void visit(TypeIdentifier typeIdentifier) |
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{ |
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typesSeen.clear(); |
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super.visit(typeIdentifier);
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} |
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private interface Action<T extends UlyssesType> { |
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void doIt(T param);
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} |
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/* Does the check for recursion */
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private <T extends UlyssesType> void CheckForRecursion(T aType, String Message, Action<T> toCall) |
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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.doIt(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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{ super.visit(t); }
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@Override
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public void visit(TupleType tupleType) |
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{ |
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this.<TupleType>CheckForRecursion(tupleType,
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String.format("Tuple contains itself: '%s' (Recursive definitions not allowed.)", |
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tupleType.toString()), |
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new Action<TupleType>(){ |
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@Override
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public void doIt(TupleType param) { |
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HackUntilCSharp4(param); |
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}}); // (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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{ super.visit(t); }
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@Override
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public void visit(ListType listType) |
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{ |
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this.<ListType>CheckForRecursion(listType,
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String.format("List contains itself: '%s' (Recursive definitions not allowed.)", |
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listType.toString()), |
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new Action<ListType>(){ |
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@Override
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public void doIt(ListType param) { |
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HackUntilCSharp4(param); |
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}}); // (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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{ super.visit(t); }
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@Override
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public void visit(MapType mapType) |
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{ |
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this.<MapType>CheckForRecursion(mapType,
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String.format("Map contains itself: '%s' (Recursive definitions not allowed.)", |
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mapType.toString()), |
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new Action<MapType>(){ |
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@Override
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public void doIt(MapType param) { |
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HackUntilCSharp4(param); |
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}}); // (x) => HackUntilCSharp4(x));
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} |
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@Override
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public 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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{ |
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super (aState, true); |
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if (aState == null) |
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throw new ArgumentException(); |
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} |
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} |