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Java example source code file (Symbol.java)
The Symbol.java Java example source code/* * Copyright (c) 2003, 2005, 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.java_cup.internal.runtime; /** * Defines the Symbol class, which is used to represent all terminals * and nonterminals while parsing. The lexer should pass CUP Symbols * and CUP returns a Symbol. * * @author Frank Flannery */ /* **************************************************************** Class Symbol what the parser expects to receive from the lexer. the token is identified as follows: sym: the symbol type parse_state: the parse state. value: is the lexical value of type Object left : is the left position in the original input file right: is the right position in the original input file ******************************************************************/ public class Symbol { /******************************* Constructor for l,r values *******************************/ public Symbol(int id, int l, int r, Object o) { this(id); left = l; right = r; value = o; } /******************************* Constructor for no l,r values ********************************/ public Symbol(int id, Object o) { this(id); left = -1; right = -1; value = o; } /***************************** Constructor for no value ***************************/ public Symbol(int sym_num, int l, int r) { sym = sym_num; left = l; right = r; value = null; } /*********************************** Constructor for no value or l,r ***********************************/ public Symbol(int sym_num) { this(sym_num, -1); left = -1; right = -1; value = null; } /*********************************** Constructor to give a start state ***********************************/ public Symbol(int sym_num, int state) { sym = sym_num; parse_state = state; } /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/ /** The symbol number of the terminal or non terminal being represented */ public int sym; /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/ /** The parse state to be recorded on the parse stack with this symbol. * This field is for the convenience of the parser and shouldn't be * modified except by the parser. */ public int parse_state; /** This allows us to catch some errors caused by scanners recycling * symbols. For the use of the parser only. [CSA, 23-Jul-1999] */ boolean used_by_parser = false; /******************************* The data passed to parser *******************************/ public int left, right; public Object value; /***************************** Printing this token out. (Override for pretty-print). ****************************/ public String toString() { return "#"+sym; } } Other Java examples (source code examples)Here is a short list of links related to this Java Symbol.java source code file: |
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