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.utils.exceptions.InternalCompilerException;

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

///  Blocks

///

public abstract class Block extends Statement implements IScope

{

	private final SymbolTable m_symbols;

	private LinkedList<Statement> m_statements;

	private Expression m_filter; /*gets transformed to guarded command in resolvevisitor!*/

	private IScope m_parentScope;

	public SymbolTable symbols() { return m_symbols; }

	public LinkedList<Statement> statements() { return m_statements; }

	public Expression filter() { return m_filter; }

	public Block(StatementKind aKind, int aline, int apos)

	{

		super (aKind, aline, apos);

		m_symbols = new SymbolTable();

		m_statements = new LinkedList<Statement>();

	}

	public Block(Block toCopy)

	{

		super (toCopy);

		m_symbols = new SymbolTable(toCopy.m_symbols);

		m_statements = new LinkedList<Statement>(toCopy.m_statements);

		m_parentScope = toCopy.m_parentScope;

		m_filter = toCopy.m_filter;

	}

	@Override

	public /*override*/ Statement Clone()

	{

		throw new NotImplementedException();

	}

	public void AddStatement(Statement toAdd)

	{

		m_statements.addLast(toAdd);

		checkParentScope(toAdd);

	}

	private void checkParentScope(Statement toAdd) {

		if (toAdd instanceof IScope) {

			final IScope child = (IScope) toAdd;

			if (child.GetParentScope() == null)

				child.SetParentScope(this);

			else if (child.GetParentScope() != this)

				throw new InternalCompilerException("Internal error: Statement added to block has parent set to different object.");

		}

	}

	public void SetStatements(LinkedList<Statement> newStatements)

	{

		m_statements = newStatements;

		for (final Statement s: newStatements)

			checkParentScope(s);

	}

	public void AddIdentifier(Identifier anIdentifier)

	{

		m_symbols.AddIdentifier(anIdentifier);

	}

	@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)

	{

		if (parentScope == null)

			System.out.println("");

		m_parentScope = parentScope;

	}

	@Override

	public void AddIdentifier(Identifier anIdentifier, Object tag)

	{

		m_symbols.AddIdentifier(anIdentifier);

	}

	public void SetFilter(Expression sexpr)

	{

		m_filter = sexpr;

	}

	/** Checks whether there are no local variables etc. for this block */

	public boolean isSimpleBlock() {

		return m_symbols.size() == 0 && m_filter == null;

	}

}