root / trunk / compiler / ooasCompiler / src / org / momut / ooas / ast / expressions / UnaryOperator.java @ 9
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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.ast.expressions; |
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import org.momut.ooas.ast.IAstVisitor; |
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import org.momut.ooas.ast.types.Type; |
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import org.momut.ooas.utils.exceptions.ArgumentException; |
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///////////////////////////////////////////////
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/// === Unary Operators ===
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///
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public class UnaryOperator extends Expression |
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{ |
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private Expression m_child; |
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public Expression child() { return m_child; } |
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public UnaryOperator(ExpressionKind aKind, Expression child, int line, int pos) |
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{ |
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super (aKind, line, pos);
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m_child = child; |
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} |
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public UnaryOperator(UnaryOperator toCopy)
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{ |
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super (toCopy);
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m_child = toCopy.m_child; |
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} |
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@Override
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public /*override*/ Expression Clone() |
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{ |
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return new UnaryOperator(this); |
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} |
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public void SetChild(Expression child) |
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{ |
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m_child = child; |
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} |
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@Override
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public /*override*/ void Accept(IAstVisitor visitor) |
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{ |
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visitor.visit(this);
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} |
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public static Expression CoerceUp(Expression anExpr, Type target) |
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{ |
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if (target == null) |
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throw new ArgumentException(); |
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if (anExpr.kind() == ExpressionKind.Value
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&& anExpr.type().kind() == target.kind() |
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&& Type.TypeEqual(Type.CoverType(anExpr.type(), target),target)) |
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{ |
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// if we are widening the range of a type assigned to a value, then just set the
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// new type and skip constructing a new node.
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anExpr.SetType(target); |
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return anExpr;
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} |
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else
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{ |
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final UnaryOperator result = new UnaryOperator(ExpressionKind.Cast, anExpr, anExpr.line(), anExpr.pos()); |
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result.SetType(target); |
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return result;
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} |
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} |
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public static Expression TryCoerceUp(Expression anExpr, Type target) |
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{ |
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if (!Type.TypeEqual(anExpr.type(), target)) |
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{ |
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return CoerceUp(anExpr, target);
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} |
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else
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return anExpr;
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} |
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} |
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