1/* 2 * [The "BSD license"] 3 * Copyright (c) 2010 Terence Parr 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29package org.antlr.tool; 30 31import org.antlr.runtime.SerializedGrammar; 32 33import java.io.*; 34import java.util.Stack; 35 36/** Serialize a grammar into a highly compressed form with 37 * only the info needed to recognize sentences. 38 * FORMAT: 39 * 40 * file ::= $ANTLR<version:byte><grammartype:byte><name:string>;<numRules:short><rules> 41 * rule ::= R<rulename:string>;B<nalts:short><alts>. 42 * alt ::= A<elems>; 43 * elem ::= t<tokentype:short> | r<ruleIndex:short> | -<char:uchar><char:uchar> | ~<tokentype> | w 44 */ 45public class GrammarSerializerFoo { 46 protected DataOutputStream out; 47 protected String filename; 48 protected Grammar g; 49 50 protected Stack streams = new Stack(); 51 protected ByteArrayOutputStream altBuf; 52 protected int numElementsInAlt = 0; 53 54 public GrammarSerializerFoo(Grammar g) { 55 this.g = g; 56 } 57 58 public void open(String filename) throws IOException { 59 this.filename = filename; 60 FileOutputStream fos = new FileOutputStream(filename); 61 BufferedOutputStream bos = new BufferedOutputStream(fos); 62 out = new DataOutputStream(bos); 63 writeString(out, SerializedGrammar.COOKIE); 64 out.writeByte(SerializedGrammar.FORMAT_VERSION); 65 } 66 67 public void close() throws IOException { 68 if ( out!=null ) out.close(); 69 out = null; 70 } 71 72 73 // WRITE 74 75 public void grammar(int grammarTokenType, String name) { 76 try { 77 /* 78 switch ( grammarTokenType ) { 79 case ANTLRParser.LEXER_GRAMMAR : out.writeByte('l'); break; 80 case ANTLRParser.PARSER_GRAMMAR : out.writeByte('p'); break; 81 case ANTLRParser.TREE_GRAMMAR: out.writeByte('t'); break; 82 case ANTLRParser.COMBINED_GRAMMAR : out.writeByte('c'); break; 83 } 84 writeString(out, name); 85 */ 86 out.writeShort(g.getRules().size()); 87 } 88 catch (IOException ioe) { 89 ErrorManager.error(ErrorManager.MSG_CANNOT_WRITE_FILE, filename); 90 } 91 } 92 93 public void rule(String name) { 94 try { 95 out.writeByte('R'); 96 writeString(out, name); 97 } 98 catch (IOException ioe) { 99 ErrorManager.error(ErrorManager.MSG_CANNOT_WRITE_FILE, filename); 100 } 101 } 102 103 public void endRule() { 104 try { 105 out.writeByte('.'); 106 } 107 catch (IOException ioe) { 108 ErrorManager.error(ErrorManager.MSG_CANNOT_WRITE_FILE, filename); 109 } 110 } 111 112 public void block(int nalts) { 113 try { 114 out.writeByte('B'); 115 out.writeShort(nalts); 116 } 117 catch (IOException ioe) { 118 ErrorManager.error(ErrorManager.MSG_CANNOT_WRITE_FILE, filename); 119 } 120 } 121 122 public void alt(GrammarAST alt) { 123 numElementsInAlt = 0; 124 try { 125 out.writeByte('A'); 126 } 127 catch (IOException ioe) { 128 ErrorManager.error(ErrorManager.MSG_CANNOT_WRITE_FILE, filename); 129 } 130 //streams.push(out); 131 //altBuf = new ByteArrayOutputStream(); 132 //out = new DataOutputStream(altBuf); 133 } 134 135 public void endAlt() { 136 try { 137 //out.flush(); 138 //out = (DataOutputStream)streams.pop(); // restore previous stream 139 out.writeByte(';'); 140 //out.writeShort(numElementsInAlt); 141 //out.write(altBuf.toByteArray()); 142 } 143 catch (IOException ioe) { 144 ErrorManager.error(ErrorManager.MSG_CANNOT_WRITE_FILE, filename); 145 } 146 } 147 148 public void ruleRef(GrammarAST t) { 149 numElementsInAlt++; 150 try { 151 out.writeByte('r'); 152 out.writeShort(g.getRuleIndex(t.getText())); 153 } 154 catch (IOException ioe) { 155 ErrorManager.error(ErrorManager.MSG_CANNOT_WRITE_FILE, filename); 156 } 157 } 158 159 public void token(GrammarAST t) { 160 numElementsInAlt++; 161 try { 162 out.writeByte('t'); 163 int ttype = g.getTokenType(t.getText()); 164 out.writeShort(ttype); 165 } 166 catch (IOException ioe) { 167 ErrorManager.error(ErrorManager.MSG_CANNOT_WRITE_FILE, filename); 168 } 169 } 170 171 public void charLiteral(GrammarAST t) { 172 numElementsInAlt++; 173 try { 174 if ( g.type!=Grammar.LEXER ) { 175 out.writeByte('t'); 176 int ttype = g.getTokenType(t.getText()); 177 out.writeShort(ttype); 178 } 179 // else lexer??? 180 } 181 catch (IOException ioe) { 182 ErrorManager.error(ErrorManager.MSG_CANNOT_WRITE_FILE, filename); 183 } 184 } 185 186 public void wildcard(GrammarAST t) { 187 numElementsInAlt++; 188 try { 189 out.writeByte('w'); 190 } 191 catch (IOException ioe) { 192 ErrorManager.error(ErrorManager.MSG_CANNOT_WRITE_FILE, filename); 193 } 194 } 195 196 public void range() { // must be char range 197 numElementsInAlt++; 198 try { 199 out.writeByte('-'); 200 } 201 catch (IOException ioe) { 202 ErrorManager.error(ErrorManager.MSG_CANNOT_WRITE_FILE, filename); 203 } 204 } 205 206 public void not() { 207 try { 208 out.writeByte('~'); 209 } 210 catch (IOException ioe) { 211 ErrorManager.error(ErrorManager.MSG_CANNOT_WRITE_FILE, filename); 212 } 213 } 214 215 public void writeString(DataOutputStream out, String s) throws IOException { 216 out.writeBytes(s); 217 out.writeByte(';'); 218 } 219} 220