/*

 * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package com.sun.tools.javac.parser;

import java.nio.*;

import com.sun.tools.javac.util.Position.LineMap;

import com.sun.tools.javac.parser.JavaTokenizer.*;

import static com.sun.tools.javac.parser.Tokens.*;

/** The lexical analyzer maps an input stream consisting of

 *  ASCII characters and Unicode escapes into a token sequence.

 *

 *  <p><b>This is NOT part of any supported API.

 *  If you write code that depends on this, you do so at your own risk.

 *  This code and its internal interfaces are subject to change or

 *  deletion without notice.</b>

 */

public class Scanner implements Lexer {

    private Tokens tokens;

    /** The token, set by nextToken().

     */

    private Token token;

    /** The previous token, set by nextToken().

     */

    private Token prevToken;

    private JavaTokenizer tokenizer;

    /**

     * Create a scanner from the input array.  This method might

     * modify the array.  To avoid copying the input array, ensure

     * that {@code inputLength < input.length} or

     * {@code input[input.length -1]} is a white space character.

     *

     * @param fac the factory which created this Scanner

     * @param input the input, might be modified

     * @param inputLength the size of the input.

     * Must be positive and less than or equal to input.length.

     */

    protected Scanner(ScannerFactory fac, CharBuffer buf) {

        this(fac, new JavaTokenizer(fac, buf));

    }

    protected Scanner(ScannerFactory fac, char[] buf, int inputLength) {

        this(fac, new JavaTokenizer(fac, buf, inputLength));

    }

    protected Scanner(ScannerFactory fac, JavaTokenizer tokenizer) {

        this.tokenizer = tokenizer;

        tokens = fac.tokens;

        token = prevToken = DUMMY;

    }

    public Token token() {

    }

    public Token prevToken() {

        return prevToken;

    }

    public void nextToken() {

        prevToken = token;

    }

    public Token split() {

        Token[] splitTokens = token.split(tokens);

        prevToken = splitTokens[0];

        token = splitTokens[1];

        return token;

    }

    public LineMap getLineMap() {

        return tokenizer.getLineMap();

    }

    public int errPos() {

        return tokenizer.errPos();

    }

    public void errPos(int pos) {

        tokenizer.errPos(pos);

    }

}