OoasTools

/**

  *

  *                      OOAS Compiler

  *

  *       Copyright 2015, AIT Austrian Institute of Technology.

  * This code is based on the C# Version of the OOAS Compiler, which is

  * copyright 2015 by the Institute of Software Technology, Graz University

  * of Technology with portions copyright by the AIT Austrian Institute of

  * Technology. All rights reserved.

  *

  * SEE THE "LICENSE" FILE FOR THE TERMS UNDER WHICH THIS FILE IS PROVIDED.

  *

  * If you modify the file please update the list of contributors below to in-

  * clude your name. Please also stick to the coding convention of using TABs

  * to do the basic (block-level) indentation and spaces for anything after

  * that. (Enable the display of special chars and it should be pretty obvious

  * what this means.) Also, remove all trailing whitespace.

  *

  * Contributors:

  *               Willibald Krenn (AIT)

  *               Stephan Zimmerer (AIT)

  *               Markus Demetz (AIT)

  *               Christoph Czurda (AIT)

  *

  */

package org.momut.ooas.ast.statements;

import java.util.LinkedList;

import org.momut.ooas.ast.IAstVisitor;

import org.momut.ooas.ast.IScope;

import org.momut.ooas.ast.expressions.Expression;

import org.momut.ooas.ast.identifiers.Identifier;

import org.momut.ooas.parser.SymbolTable;

///////////////////////////////////////////////

///  Assignment

///

public final class Assignment extends Statement implements IScope

{

        private final LinkedList<Expression> m_places;

        private final LinkedList<Expression> m_values;

        private Expression m_nondetExpression;

        private IScope m_parentScope;

        private final SymbolTable m_symbols; // needed for nondeterminsitic assignment (we most likely will have new variables)

        public LinkedList<Expression> places() { return m_places; }

        public LinkedList<Expression> values() { return m_values; }

        public Expression nondetExpression() { return m_nondetExpression; }

        public SymbolTable symbols() { return m_symbols; }

        public Assignment(Expression place, Expression value, Expression nondetExpression, int aline, int apos)

        {

                super (StatementKind.Assignment, aline, apos);

                m_places = new LinkedList<Expression>();

                m_values = new LinkedList<Expression>();

                if (place != null)

                        m_places.addFirst(place);

                if (value != null)

                        m_values.addFirst(value);

                m_nondetExpression = nondetExpression;

                m_symbols = new SymbolTable();

        }

        public Assignment(Assignment toCopy)

        {

                super (toCopy);

                m_places = new LinkedList<Expression>(toCopy.m_places);

                m_values = new LinkedList<Expression>(toCopy.m_values);

                m_nondetExpression = toCopy.m_nondetExpression;

                m_symbols = new SymbolTable(toCopy.symbols());

        }

        @Override

        public /*override*/ Statement Clone()

        {

                return new Assignment(this);

        }

        public void AddPlace(Expression aPlace)

        {

                m_places.addLast(aPlace);

        }

        public void AddValue(Expression aValue)

        {

                m_values.addLast(aValue);

        }

        public void SetNondetExpression(Expression anExpr)

        {

                m_nondetExpression = anExpr;

        }

        @Override

        public /*override*/ void Accept(IAstVisitor visitor)

        {

                visitor.visit(this);

        }

        @Override

        public Identifier ResolveIdentifier(String aName)

        {

                if (m_symbols.Defined(aName))

                        return m_symbols.Get(aName);

                else

                        return null;

        }

        @Override

        public IScope GetParentScope()

        {

                return m_parentScope;

        }

        @Override

        public void SetParentScope(IScope parentScope)

        {

                m_parentScope = parentScope;

        }

        @Override

        public void AddIdentifier(Identifier anIdentifier, Object tag)

        {

                m_symbols.AddIdentifier(anIdentifier);

        }

}