/*******************************************************************************
 * Copyright (c) 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v0.5 
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v05.html
 * 
 * Contributors:
 *     IBM Corp. - Rational Software - initial implementation
 ******************************************************************************/
/*
 * Created on Aug 8, 2003
 */
package org.eclipse.cdt.internal.core.search.matching;

import java.io.IOException;

import org.eclipse.cdt.core.parser.ISourceElementCallbackDelegate;
import org.eclipse.cdt.core.parser.ast.IASTMacro;
import org.eclipse.cdt.core.parser.ast.IASTOffsetableNamedElement;
import org.eclipse.cdt.core.search.ICSearchScope;
import org.eclipse.cdt.internal.core.CharOperation;
import org.eclipse.cdt.internal.core.index.IEntryResult;
import org.eclipse.cdt.internal.core.index.impl.IndexInput;
import org.eclipse.cdt.internal.core.index.impl.IndexedFile;
import org.eclipse.cdt.internal.core.search.IIndexSearchRequestor;
import org.eclipse.cdt.internal.core.search.indexing.AbstractIndexer;

/**
 * @author aniefer
 *
 * To change the template for this generated type comment go to
 * Window>Preferences>Java>Code Generation>Code and Comments
 */
public class MacroDeclarationPattern extends CSearchPattern {

	/**
	 * @param name
	 * @param matchMode
	 * @param limitTo
	 * @param caseSensitive
	 */
	public MacroDeclarationPattern(char[] name, int matchMode, LimitTo limitTo, boolean caseSensitive) {
		super( matchMode, caseSensitive, limitTo );
		
		simpleName = name;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.cdt.core.search.ICSearchPattern#matchLevel(org.eclipse.cdt.core.parser.ast.IASTOffsetableElement)
	 */
	public int matchLevel(ISourceElementCallbackDelegate node, LimitTo limit ) {
		if( !(node instanceof IASTMacro) || !canAccept( limit ) ){
			return IMPOSSIBLE_MATCH;
		}
		
		String nodeName = ((IASTOffsetableNamedElement)node).getName();
		
		//check name, if simpleName == null, its treated the same as "*"	
		if( simpleName != null && !matchesName( simpleName, nodeName.toCharArray() ) ){
			return IMPOSSIBLE_MATCH;
		}
		
		return ACCURATE_MATCH;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.cdt.internal.core.search.matching.CSearchPattern#feedIndexRequestor(org.eclipse.cdt.internal.core.search.IIndexSearchRequestor, int, int[], org.eclipse.cdt.internal.core.index.impl.IndexInput, org.eclipse.cdt.core.search.ICSearchScope)
	 */
	public void feedIndexRequestor(IIndexSearchRequestor requestor, int detailLevel, int[] references, IndexInput input, ICSearchScope scope) throws IOException {
		for (int i = 0, max = references.length; i < max; i++) {
			IndexedFile file = input.getIndexedFile(references[i]);
			String path;
			if (file != null && scope.encloses(path =file.getPath())) {
				requestor.acceptMacroDeclaration(path, decodedSimpleName);
			}
		}	
	}

	protected void resetIndexInfo(){
		decodedSimpleName = null;
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.cdt.internal.core.search.matching.CSearchPattern#decodeIndexEntry(org.eclipse.cdt.internal.core.index.IEntryResult)
	 */
	protected void decodeIndexEntry(IEntryResult entryResult) {
		char[] word = entryResult.getWord();
		int size = word.length;
		
		int firstSlash = CharOperation.indexOf( SEPARATOR, word, 0 );
	
		this.decodedSimpleName = CharOperation.subarray(word, firstSlash + 1, -1);
	}

	/* (non-Javadoc)
	 * @see org.eclipse.cdt.internal.core.search.matching.CSearchPattern#indexEntryPrefix()
	 */
	public char[] indexEntryPrefix() {
		return AbstractIndexer.bestMacroPrefix(
						_limitTo,
						simpleName,
						_matchMode, _caseSensitive
		);
	}

	/* (non-Javadoc)
	 * @see org.eclipse.cdt.internal.core.search.matching.CSearchPattern#matchIndexEntry()
	 */
	protected boolean matchIndexEntry() {
		/* check simple name matches */
		if (simpleName != null){
			if( ! matchesName( simpleName, decodedSimpleName ) ){
				return false; 
			}
		}
		
		return true;
	}
	
	protected char [] simpleName;
	protected char [] decodedSimpleName;
}