/*******************************************************************************
 * Copyright (c) 2005, 2011 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    John Camelon (IBM Rational Software) - Initial API and implementation
 *    Yuan Zhang / Beth Tibbitts (IBM Research)
 *    Markus Schorn (Wind River Systems)
 *******************************************************************************/
package org.eclipse.cdt.internal.core.dom.parser.c;

import org.eclipse.cdt.core.dom.ast.ASTVisitor;
import org.eclipse.cdt.core.dom.ast.IASTCompoundStatement;
import org.eclipse.cdt.core.dom.ast.IASTExpressionStatement;
import org.eclipse.cdt.core.dom.ast.IASTStatement;
import org.eclipse.cdt.core.dom.ast.ISemanticProblem;
import org.eclipse.cdt.core.dom.ast.IType;
import org.eclipse.cdt.core.dom.ast.gnu.IGNUASTCompoundStatementExpression;
import org.eclipse.cdt.internal.core.dom.parser.ASTNode;
import org.eclipse.cdt.internal.core.dom.parser.ProblemType;

/**
 * Compound statement for c
 */
public class CASTCompoundStatementExpression extends ASTNode implements IGNUASTCompoundStatementExpression {

    private IASTCompoundStatement statement;

    public CASTCompoundStatementExpression() {
	}

	public CASTCompoundStatementExpression(IASTCompoundStatement statement) {
		setCompoundStatement(statement);
	}
	
	public CASTCompoundStatementExpression copy() {
		return copy(CopyStyle.withoutLocations);
	}

	public CASTCompoundStatementExpression copy(CopyStyle style) {
		CASTCompoundStatementExpression copy = new CASTCompoundStatementExpression();
		copy.setCompoundStatement(statement == null ? null : statement.copy(style));
		copy.setOffsetAndLength(this);
		if (style == CopyStyle.withLocations) {
			copy.setCopyLocation(this);
		}
		return copy;
	}

	public IASTCompoundStatement getCompoundStatement() {
        return statement;
    }

    public void setCompoundStatement(IASTCompoundStatement statement) {
        assertNotFrozen();
        this.statement = statement;
        if (statement != null) {
			statement.setParent(this);
			statement.setPropertyInParent(STATEMENT);
		}
    }

    @Override
	public boolean accept( ASTVisitor action ){
        if( action.shouldVisitExpressions ){
		    switch( action.visit( this ) ){
	            case ASTVisitor.PROCESS_ABORT : return false;
	            case ASTVisitor.PROCESS_SKIP  : return true;
	            default : break;
	        }
		}
     
        if( statement != null ) if( !statement.accept( action ) ) return false;
        if( action.shouldVisitExpressions ){
        	switch( action.leave( this ) ){
        		case ASTVisitor.PROCESS_ABORT : return false;
        		case ASTVisitor.PROCESS_SKIP  : return true;
        		default : break;
        	}
        }
        return true;
    }
    
    public IType getExpressionType() {
		IASTCompoundStatement compound = getCompoundStatement();
		IASTStatement[] statements = compound.getStatements();
		if (statements.length > 0) {
			IASTStatement st = statements[statements.length - 1];
			if (st instanceof IASTExpressionStatement)
				return ((IASTExpressionStatement)st).getExpression().getExpressionType();
		}
		return new ProblemType(ISemanticProblem.TYPE_UNKNOWN_FOR_EXPRESSION);
	}

	public boolean isLValue() {
		IASTCompoundStatement compound = getCompoundStatement();
		IASTStatement[] statements = compound.getStatements();
		if (statements.length > 0) {
			IASTStatement st = statements[statements.length - 1];
			if (st instanceof IASTExpressionStatement)
				return ((IASTExpressionStatement)st).getExpression().isLValue();
		}
		return false;
	}
	
	public final ValueCategory getValueCategory() {
		return isLValue() ? ValueCategory.LVALUE : ValueCategory.PRVALUE;
	}
}