/*******************************************************************************
 * Copyright (c) 2009, 2011 Wind River Systems, Inc. and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *    Markus Schorn - initial API and implementation
 *******************************************************************************/
package org.eclipse.cdt.internal.core.dom.parser.c;

import org.eclipse.cdt.core.dom.ast.ASTVisitor;
import org.eclipse.cdt.core.dom.ast.IASTDeclaration;
import org.eclipse.cdt.core.dom.ast.IASTDeclarator;
import org.eclipse.cdt.core.dom.ast.IASTExpression;
import org.eclipse.cdt.core.dom.ast.IASTNode;
import org.eclipse.cdt.core.dom.ast.IASTParameterDeclaration;
import org.eclipse.cdt.core.dom.ast.IScope;
import org.eclipse.cdt.core.dom.ast.c.ICCompositeTypeScope;
import org.eclipse.cdt.internal.core.dom.parser.ASTAmbiguousNode;

/**
 * Visitor to resolve ast ambiguities in the right order, which is simply a depth
 * first traversal.
 */
public final class CASTAmbiguityResolver extends ASTVisitor {
	public CASTAmbiguityResolver() {
		super(false);
		includeInactiveNodes = true;
		shouldVisitAmbiguousNodes = true;
	}

	@Override
	public int visit(ASTAmbiguousNode astAmbiguousNode) {
		IASTNode node = astAmbiguousNode.resolveAmbiguity(this);
		if (node instanceof IASTDeclarator || node instanceof IASTParameterDeclaration
				|| node instanceof IASTDeclaration) {
			while (node != null) {
				if (node instanceof IASTDeclaration || node instanceof IASTParameterDeclaration) {
					repopulateScope(node);
					break;
				}
				if (node instanceof IASTExpression) {
					break;
				}
				node = node.getParent();
			}
		}
		return PROCESS_SKIP;
	}

	private void repopulateScope(IASTNode node) {
		IScope scope = CVisitor.getContainingScope(node);
		if (scope instanceof CScope) {
			CScope cscope = (CScope) scope;
			if (scope instanceof ICCompositeTypeScope) {
				cscope.markAsUncached();
			} else {
				cscope.collectNames(node);
			}
		}
	}
}
