/*
[The "BSD license"]
Copyright (c) 2005-2009 Terence Parr
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. The name of the author may not be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.eclipse.persistence.internal.libraries.antlr.runtime;
import java.io.IOException;
import java.io.FileInputStream;
import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.util.List;
import java.util.ArrayList;
public class SerializedGrammar {
public static final String COOKIE = "$ANTLR";
public static final int FORMAT_VERSION = 1;
//public static org.eclipse.persistence.internal.libraries.antlr.tool.Grammar gr; // TESTING ONLY; remove later
public String name;
public char type; // in {l, p, t, c}
public List<? extends Rule> rules;
protected class Rule {
String name;
Block block;
public Rule(String name, Block block) {
this.name = name;
this.block = block;
}
@Override
public String toString() {
return name+":"+block;
}
}
protected abstract class Node {
@Override
public abstract String toString();
}
protected class Block extends Node {
List[] alts;
public Block(List[] alts) {
this.alts = alts;
}
@Override
public String toString() {
StringBuilder buf = new StringBuilder();
buf.append("(");
for (int i = 0; i < alts.length; i++) {
List<?> alt = alts[i];
if ( i>0 ) buf.append("|");
buf.append(alt.toString());
}
buf.append(")");
return buf.toString();
}
}
protected class TokenRef extends Node {
int ttype;
public TokenRef(int ttype) { this.ttype = ttype; }
@Override
public String toString() { return String.valueOf(ttype); }
}
protected class RuleRef extends Node {
int ruleIndex;
public RuleRef(int ruleIndex) { this.ruleIndex = ruleIndex; }
@Override
public String toString() { return String.valueOf(ruleIndex); }
}
public SerializedGrammar(String filename) throws IOException {
System.out.println("loading "+filename);
FileInputStream fis = new FileInputStream(filename);
BufferedInputStream bos = new BufferedInputStream(fis);
DataInputStream in = new DataInputStream(bos);
readFile(in);
in.close();
}
protected void readFile(DataInputStream in) throws IOException {
String cookie = readString(in); // get $ANTLR
if ( !cookie.equals(COOKIE) ) throw new IOException("not a serialized grammar file");
int version = in.readByte();
char grammarType = (char)in.readByte();
this.type = grammarType;
String grammarName = readString(in);
this.name = grammarName;
System.out.println(grammarType+" grammar "+grammarName);
int numRules = in.readShort();
System.out.println("num rules = "+numRules);
rules = readRules(in, numRules);
}
protected List<? extends Rule> readRules(DataInputStream in, int numRules) throws IOException {
List<Rule> rules = new ArrayList<Rule>();
for (int i=0; i<numRules; i++) {
Rule r = readRule(in);
rules.add(r);
}
return rules;
}
protected Rule readRule(DataInputStream in) throws IOException {
byte R = in.readByte();
if ( R!='R' ) throw new IOException("missing R on start of rule");
String name = readString(in);
System.out.println("rule: "+name);
byte B = in.readByte();
Block b = readBlock(in);
byte period = in.readByte();
if ( period!='.' ) throw new IOException("missing . on end of rule");
return new Rule(name, b);
}
protected Block readBlock(DataInputStream in) throws IOException {
int nalts = in.readShort();
@SuppressWarnings("unchecked")
List<Node>[] alts = (List<Node>[])new List<?>[nalts];
//System.out.println("enter block n="+nalts);
for (int i=0; i<nalts; i++) {
List<Node> alt = readAlt(in);
alts[i] = alt;
}
//System.out.println("exit block");
return new Block(alts);
}
protected List<Node> readAlt(DataInputStream in) throws IOException {
List<Node> alt = new ArrayList<Node>();
byte A = in.readByte();
if ( A!='A' ) throw new IOException("missing A on start of alt");
byte cmd = in.readByte();
while ( cmd!=';' ) {
switch (cmd) {
case 't' :
int ttype = in.readShort();
alt.add(new TokenRef(ttype));
//System.out.println("read token "+gr.getTokenDisplayName(ttype));
break;
case 'r' :
int ruleIndex = in.readShort();
alt.add(new RuleRef(ruleIndex));
//System.out.println("read rule "+gr.getRuleName(ruleIndex));
break;
case '.' : // wildcard
break;
case '-' : // range
int from = in.readChar();
int to = in.readChar();
break;
case '~' : // not
int notThisTokenType = in.readShort();
break;
case 'B' : // nested block
Block b = readBlock(in);
alt.add(b);
break;
}
cmd = in.readByte();
}
//System.out.println("exit alt");
return alt;
}
protected String readString(DataInputStream in) throws IOException {
byte c = in.readByte();
StringBuilder buf = new StringBuilder();
while ( c!=';' ) {
buf.append((char)c);
c = in.readByte();
}
return buf.toString();
}
@Override
public String toString() {
StringBuilder buf = new StringBuilder();
buf.append(type).append(" grammar ").append(name);
buf.append(rules);
return buf.toString();
}
}