?? lexstream.java
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// $Id: LexStream.java,v 1.3 1999/11/04 14:02:16 shields Exp $// This software is subject to the terms of the IBM Jikes Compiler// License Agreement available at the following URL:// http://www.ibm.com/research/jikes.// Copyright (C) 1983, 1999, International Business Machines Corporation// and others. All Rights Reserved.// You must accept the terms of that agreement to use this software.import java.util.Vector;import java.io.FileInputStream;//// LexStream holds a stream of tokens generated from an input and // provides methods to retrieve information from the stream.//public class LexStream implements bnfsym{ private int index; final static int INFINITY = Integer.MAX_VALUE; int Next(int i) { return (++i < tokens.size() ? i : tokens.size() - 1); } int Previous(int i) { return (i <= 0 ? 0 : i - 1); } int Peek() { return Next(index); } void Reset(int i) { index = Previous(i); } void Reset() { index = 0; } int Gettoken() { return index = Next(index); } int Gettoken(int end_token) { return index = (index < end_token ? Next(index) : tokens.size() - 1); } int Badtoken() { return 0; } int Kind(int i) { return ((Token) tokens.elementAt(i)).kind; } String Name(int i) { return ((Token) tokens.elementAt(i)).name; } //* //* Constructors and Destructor. //* LexStream(String filename) throws java.io.FileNotFoundException { srcfile = new FileInputStream(filename); } void dump() { for (int i = 1; i < tokens.size(); i++) { System.out.print(" ("); switch(((Token) tokens.elementAt(i)).kind) { case TK_SYMBOL: System.out.print("SYMBOL"); break; case TK_OR: System.out.print("|"); break; case TK_PRODUCES: System.out.print("::="); break; case TK_EOF: System.out.print("EOF"); break; default: System.out.print(((Token) tokens.elementAt(i)).kind); } System.out.print(") : \""); System.out.print(((Token) tokens.elementAt(i)).name); System.out.println("\""); } } Vector tokens = new Vector(); FileInputStream srcfile;}
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