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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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/// This visitor scans all methods and decides whether they are pure, i.e. there is no state-update.
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/// </summary>
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public sealed class OoaMethodPureClassifierVisitor : OoaCompleteAstTraversalVisitor
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{
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Stack<MethodIdentifier> currentMethod = new Stack<MethodIdentifier>();
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public override void visit(MethodIdentifier methodIdentifier)
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{
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currentMethod.Push( methodIdentifier);
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((FunctionType)currentMethod.Peek().type).SetIsPureFunction(true); // assume is true..
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base.visit(currentMethod.Peek());
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if (((FunctionType)currentMethod.Peek().type).isPureFunction)
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{
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m_ParserState.AddMessage(
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new ParserMessage(m_ParserState.filename, methodIdentifier.line,
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methodIdentifier.column, String.Format("Found pure method: {0}",
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methodIdentifier.tokenText)));
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} else
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m_ParserState.AddMessage( new ParserMessage(m_ParserState.filename, methodIdentifier.line,
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methodIdentifier.column, String.Format("Found extended method: {0}",
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methodIdentifier.tokenText)));
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currentMethod.Pop();
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}
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public override void visit(OoActionSystemType systemType)
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{
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bool functionPure = false; //introduce variable with save value
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if (currentMethod.Count > 0 && currentMethod.Peek() != null) //if we are determining the pureness...
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{
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functionPure = ((FunctionType)currentMethod.Peek().type).isPureFunction; //...save the current value
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}
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base.visit(systemType); // go down in recursion
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if ( currentMethod.Count > 0 && currentMethod.Peek() != null) //but restore old pureness!
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{
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((FunctionType)currentMethod.Peek().type).SetIsPureFunction(functionPure);
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}
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}
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public override void visit(Assignment assignment)
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{
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bool assignmentPure = true;
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if (currentMethod.Count > 0 && currentMethod.Peek() != null)
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{
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foreach (var x in assignment.places)
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{
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if (x.kind != ExpressionKind.Identifier)
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assignmentPure = false;
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else if (((IdentifierExpression)x).identifier.kind == IdentifierKind.AttributeIdentifier)
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assignmentPure = false;
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}
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bool functionPure = assignmentPure && ((FunctionType)currentMethod.Peek().type).isPureFunction;
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((FunctionType)currentMethod.Peek().type).SetIsPureFunction(functionPure);
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}
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base.visit(assignment);
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}
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public OoaMethodPureClassifierVisitor(ParserState aState)
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: base(aState)
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{ }
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}
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}
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