/*******************************************************************************
 * Copyright (c) 2009 Wind River Systems, Inc. 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:
 *    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.IASTCompositeTypeSpecifier;
import org.eclipse.cdt.core.dom.ast.IASTDeclSpecifier;
import org.eclipse.cdt.core.dom.ast.IASTDeclaration;
import org.eclipse.cdt.core.dom.ast.IASTName;
import org.eclipse.cdt.core.dom.ast.IASTSimpleDeclaration;
import org.eclipse.cdt.core.dom.ast.IASTTranslationUnit;
import org.eclipse.cdt.core.dom.ast.IBinding;
import org.eclipse.cdt.core.dom.ast.ICompositeType;
import org.eclipse.cdt.core.parser.util.CharArrayMap;

/**
 * Utility to map index bindings to ast bindings.
 */
public class CStructMapper {
	private class Visitor extends ASTVisitor {
		Visitor() {
			shouldVisitDeclarations= true;
		}

		@Override
		public int visit(IASTDeclaration declaration) {
			if (declaration instanceof IASTSimpleDeclaration) {
				IASTDeclSpecifier declspec = ((IASTSimpleDeclaration) declaration).getDeclSpecifier();
				if (declspec instanceof IASTCompositeTypeSpecifier) {
					IASTCompositeTypeSpecifier cts= (IASTCompositeTypeSpecifier) declspec;
					final IASTName name = cts.getName();
					final char[] nameChars = name.toCharArray();
					if (nameChars.length > 0) {
						fStructs.put(nameChars, name);
					}
					return PROCESS_CONTINUE;
				}
			}
			return PROCESS_SKIP;
		}
	}

	private final IASTTranslationUnit fTranslationUnit;
	protected CharArrayMap<IASTName> fStructs;
	
	public CStructMapper(IASTTranslationUnit tu) {
		fTranslationUnit= tu;
	}

	public ICompositeType mapToAST(ICompositeType type) {
		if (fStructs == null) {
			fStructs= new CharArrayMap<IASTName>();
			fTranslationUnit.accept(new Visitor());
		}
		IASTName name= fStructs.get(type.getNameCharArray());
		if (name != null) {
			IBinding b= name.resolveBinding();
			if (b instanceof ICompositeType) {
				final ICompositeType mapped = (ICompositeType) b;
				if (mapped.isSameType(type)) {
					return mapped;
				}
			}
		}
		return type;
	}
}