content: /*
   * Copyright (c) 2005, 2019, 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 openjdk.tools.javac.parser;
  
  import openjdk.tools.javac.parser.Tokens.*;
  import openjdk.tools.javac.util.Position.LineMap;
  
  /**
   * 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 interface Lexer {
  
      /**
       * Consume the next token.
       */
      void nextToken();
  
      /**
       * Return current token.
       */
      Token token();
  
      /**
       * Return token with given lookahead.
       */
      Token token(int lookahead);
  
      /**
       * Return the last character position of the previous token.
       */
      Token prevToken();
  
      /**
       * Splits the current token in two and return the first (split) token.
       * For instance {@literal '<<<'} is split into two tokens
       * {@literal '<'} and {@literal '<<'} respectively,
       * and the latter is returned.
       */
      Token split();
  
      /**
       * Return the position where a lexical error occurred;
       */
      int errPos();
  
      /**
       * Set the position where a lexical error occurred;
       */
      void errPos(int pos);
  
      /**
       * Build a map for translating between line numbers and
       * positions in the input.
       *
       * @return a LineMap
       */
      LineMap getLineMap();
  }
  