/*******************************************************************************
 * Copyright (c) 2015 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:
 *     Sergey Prigogin (Google) - Initial API and implementation
 *******************************************************************************/
package org.eclipse.cdt.internal.core.dom.parser.cpp;

import org.eclipse.cdt.core.dom.ast.ASTVisitor;
import org.eclipse.cdt.core.dom.ast.IASTNode;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTDesignatedInitializer;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTDesignator;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTInitializerClause;
import org.eclipse.cdt.core.parser.util.ArrayUtil;
import org.eclipse.cdt.internal.core.dom.parser.ASTNode;
import org.eclipse.cdt.internal.core.dom.parser.IASTAmbiguityParent;

/**
 * Implementation for designated initializers.
 */
public class CPPASTDesignatedInitializer extends ASTNode
		implements ICPPASTDesignatedInitializer, IASTAmbiguityParent, ICPPEvaluationOwner {
    private ICPPASTInitializerClause rhs;
    private ICPPASTDesignator[] designators = ICPPASTDesignator.EMPTY_ARRAY;
    private int designatorsPos;

    public CPPASTDesignatedInitializer() {
	}

	public CPPASTDesignatedInitializer(ICPPASTInitializerClause init) {
		setOperand(init);
	}

	@Override
	public CPPASTDesignatedInitializer copy() {
		return copy(CopyStyle.withoutLocations);
	}

	@Override
	public CPPASTDesignatedInitializer copy(CopyStyle style) {
		CPPASTDesignatedInitializer copy =
				new CPPASTDesignatedInitializer(rhs == null ? null : (ICPPASTInitializerClause) rhs.copy(style));
		for (ICPPASTDesignator designator : getDesignators()) {
			copy.addDesignator(designator == null ? null : designator.copy(style));
		}
		return copy(copy, style);
	}

	@Override
	public void addDesignator(ICPPASTDesignator designator) {
        assertNotFrozen();
    	if (designator != null) {
    		designator.setParent(this);
    		designator.setPropertyInParent(DESIGNATOR);
    		designators = ArrayUtil.appendAt(designators, designatorsPos++, designator);
    	}
    }

    @Override
	public ICPPASTDesignator[] getDesignators() {
        designators = ArrayUtil.trim(designators, designatorsPos);
        return designators;
    }

    @Override
	public ICPPASTInitializerClause getOperand() {
        return rhs;
	}

	@Override
	public void setOperand(ICPPASTInitializerClause operand) {
        assertNotFrozen();
        this.rhs = operand;
        if (rhs != null) {
			rhs.setParent(this);
			rhs.setPropertyInParent(OPERAND);
		}
	}

	@Override
	public ICPPEvaluation getEvaluation() {
		return ((ICPPEvaluationOwner) rhs).getEvaluation();
	}

	@Override
	public boolean accept(ASTVisitor action) {
        if (action.shouldVisitInitializers) {
		    switch (action.visit(this)) {
	            case ASTVisitor.PROCESS_ABORT: return false;
	            case ASTVisitor.PROCESS_SKIP: return true;
	            default: break;
	        }
		}
        ICPPASTDesignator[] ds = getDesignators();
        for (int i = 0; i < ds.length; i++) {
            if (!ds[i].accept(action))
            	return false;
        }
        if (rhs != null && !rhs.accept(action)) return false;

        if (action.shouldVisitInitializers) {
		    switch (action.leave(this)) {
	            case ASTVisitor.PROCESS_ABORT: return false;
	            case ASTVisitor.PROCESS_SKIP: return true;
	            default: break;
		    }
		}
        return true;
    }

    @Override
	public void replace(IASTNode child, IASTNode other) {
    	if (child == rhs) {
    		other.setPropertyInParent(child.getPropertyInParent());
    		other.setParent(child.getParent());
    		rhs = (ICPPASTInitializerClause) other;
    	}
    }
}