I've attached the HTMLParser.jj file that successfully parses Japanese HTML for indexing. It is derived from the lucene-1.4-final version of HTMLParser.jj, and I've attached a patch (against lucene-1.4-final). Obviously, I don't have CVS commit access (and I'm not requesting it), but I'd like to contribute this patch back to Lucene as it has been absolutely invaluable for my work, and this is my way of saying "thank you!" Let me know if a patch against CVS would be more convenient, or if this patch is even worthy of being included in Lucene. I certainly think it is. :-)
Joey
/* ==================================================================== * The Apache Software License, Version 1.1 * * Copyright (c) 2001 The Apache Software Foundation. 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 end-user documentation included with the redistribution, * if any, must include the following acknowledgment: * "This product includes software developed by the * Apache Software Foundation (http://www.apache.org/)." * Alternately, this acknowledgment may appear in the software itself, * if and wherever such third-party acknowledgments normally appear. * * 4. The names "Apache" and "Apache Software Foundation" and * "Apache Lucene" must not be used to endorse or promote products * derived from this software without prior written permission. For * written permission, please contact [EMAIL PROTECTED] * * 5. Products derived from this software may not be called "Apache", * "Apache Lucene", nor may "Apache" appear in their name, without * prior written permission of the Apache Software Foundation. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 APACHE SOFTWARE FOUNDATION OR * ITS CONTRIBUTORS 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. * ==================================================================== * * This software consists of voluntary contributions made by many * individuals on behalf of the Apache Software Foundation. For more * information on the Apache Software Foundation, please see * <http://www.apache.org/>. */
// HTMLParser.jj
options {
STATIC = false;
OPTIMIZE_TOKEN_MANAGER = true;
//DEBUG_LOOKAHEAD = true;
//DEBUG_TOKEN_MANAGER = true;
}
PARSER_BEGIN(HTMLParser)
package org.apache.lucene.demo.html;
import java.io.*;
import java.util.Properties;
public class HTMLParser {
public static int SUMMARY_LENGTH = 200;
StringBuffer title = new StringBuffer(SUMMARY_LENGTH);
StringBuffer summary = new StringBuffer(SUMMARY_LENGTH * 2);
Properties metaTags=new Properties();
String currentMetaTag=null;
String currentMetaContent=null;
int length = 0;
boolean titleComplete = false;
boolean inTitle = false;
boolean inMetaTag = false;
boolean inStyle = false;
boolean afterTag = false;
boolean afterSpace = false;
String eol = System.getProperty("line.separator");
Reader pipeIn = null;
Writer pipeOut;
private MyPipedInputStream pipeInStream = null;
private PipedOutputStream pipeOutStream = null;
private class MyPipedInputStream extends PipedInputStream{
public MyPipedInputStream(){
super();
}
public MyPipedInputStream(PipedOutputStream src) throws IOException{
super(src);
}
public boolean full() throws IOException{
return this.available() >= PipedInputStream.PIPE_SIZE;
}
}
public HTMLParser(File file) throws FileNotFoundException {
this(new FileInputStream(file));
}
public String getTitle() throws IOException, InterruptedException {
if (pipeIn == null)
getReader(); // spawn parsing thread
while (true) {
synchronized(this) {
if (titleComplete || pipeInStream.full())
break;
wait(10);
}
}
return title.toString().trim();
}
public Properties getMetaTags() throws IOException,
InterruptedException {
if (pipeIn == null)
getReader(); // spawn parsing thread
while (true) {
synchronized(this) {
if (titleComplete || pipeInStream.full())
break;
wait(10);
}
}
return metaTags;
}
public String getSummary() throws IOException, InterruptedException {
if (pipeIn == null)
getReader(); // spawn parsing thread
while (true) {
synchronized(this) {
if (summary.length() >= SUMMARY_LENGTH || pipeInStream.full())
break;
wait(10);
}
}
if (summary.length() > SUMMARY_LENGTH)
summary.setLength(SUMMARY_LENGTH);
String sum = summary.toString().trim();
String tit = getTitle();
if (sum.startsWith(tit) || sum.equals(""))
return tit;
else
return sum;
}
public Reader getReader() throws IOException {
if (pipeIn == null) {
pipeInStream = new MyPipedInputStream();
pipeOutStream = new PipedOutputStream(pipeInStream);
pipeIn = new InputStreamReader(pipeInStream);
pipeOut = new OutputStreamWriter(pipeOutStream);
Thread thread = new ParserThread(this);
thread.start(); // start parsing
}
return pipeIn;
}
void addToSummary(String text) {
if (summary.length() < SUMMARY_LENGTH) {
summary.append(text);
if (summary.length() >= SUMMARY_LENGTH) {
synchronized(this) {
notifyAll();
}
}
}
}
void addText(String text) throws IOException {
if (inStyle)
return;
if (inTitle)
title.append(text);
else {
addToSummary(text);
if (!titleComplete && !title.equals("")) { // finished title
synchronized(this) {
titleComplete = true; // tell waiting threads
notifyAll();
}
}
}
length += text.length();
pipeOut.write(text);
afterSpace = false;
}
void addMetaTag() throws IOException {
metaTags.setProperty(currentMetaTag, currentMetaContent);
currentMetaTag = null;
currentMetaContent = null;
return;
}
void addSpace() throws IOException {
if (!afterSpace) {
if (inTitle)
title.append(" ");
else
addToSummary(" ");
String space = afterTag ? eol : " ";
length += space.length();
pipeOut.write(space);
afterSpace = true;
}
}
// void handleException(Exception e) {
// System.out.println(e.toString()); // print the error message
// System.out.println("Skipping...");
// Token t;
// do {
// t = getNextToken();
// } while (t.kind != TagEnd);
// }
}
PARSER_END(HTMLParser)
void HTMLDocument() throws IOException :
{
Token t;
}
{
// try {
( Tag() { afterTag = true; }
| t=Decl() { afterTag = true; }
| CommentTag() { afterTag = true; }
| ScriptTag() { afterTag = true; }
| t=<Word> { addText(t.image); afterTag = false; }
| t=<CJK> { addText(t.image); afterTag = false; }
| t=<Entity> { addText(Entities.decode(t.image)); afterTag = false; }
| t=<Punct> { addText(t.image); afterTag = false; }
| <Space> { addSpace(); afterTag = false; }
)* <EOF>
// } catch (ParseException e) {
// handleException(e);
// }
}
void Tag() throws IOException :
{
Token t1, t2;
boolean inImg = false;
}
{
t1=<TagName> {
String tagName = t1.image.toLowerCase();
if(Tags.WS_ELEMS.contains(tagName) ) {
addSpace();
}
inTitle = tagName.equalsIgnoreCase("<title"); // keep track if in <TITLE>
inMetaTag = tagName.equalsIgnoreCase("<META"); // keep track if in <META>
inStyle = tagName.equalsIgnoreCase("<STYLE"); // keep track if in <STYLE>
inImg = tagName.equalsIgnoreCase("<img"); // keep track if in <IMG>
}
(t1=<ArgName>
(<ArgEquals>
(t2=ArgValue() // save ALT text in IMG tag
{
if (inImg && t1.image.equalsIgnoreCase("alt") && t2 != null)
addText("[" + t2.image + "]");
if(inMetaTag &&
( t1.image.equalsIgnoreCase("name") ||
t1.image.equalsIgnoreCase("HTTP-EQUIV")
)
&& t2 != null)
{
currentMetaTag=t2.image.toLowerCase();
if(currentMetaTag != null && currentMetaContent != null) {
addMetaTag();
}
}
if(inMetaTag && t1.image.equalsIgnoreCase("content") && t2 !=
null)
{
currentMetaContent=t2.image.toLowerCase();
if(currentMetaTag != null && currentMetaContent != null) {
addMetaTag();
}
}
}
)?
)?
)*
<TagEnd>
}
Token ArgValue() :
{
Token t = null;
}
{
t=<ArgValue> { return t; }
| LOOKAHEAD(2)
<ArgQuote1> <CloseQuote1> { return t; }
| <ArgQuote1> t=<Quote1Text> <CloseQuote1> { return t; }
| LOOKAHEAD(2)
<ArgQuote2> <CloseQuote2> { return t; }
| <ArgQuote2> t=<Quote2Text> <CloseQuote2> { return t; }
}
Token Decl() :
{
Token t;
}
{
t=<DeclName> ( <ArgName> | ArgValue() | <ArgEquals> )* <TagEnd>
{ return t; }
}
void CommentTag() :
{}
{
(<Comment1> ( <CommentText1> )* <CommentEnd1>)
|
(<Comment2> ( <CommentText2> )* <CommentEnd2>)
}
void ScriptTag() :
{}
{
<ScriptStart> ( <ScriptText> )* <ScriptEnd>
}
TOKEN :
{
< ScriptStart: "<script" > : WithinScript
| < TagName: "<" ("/")? ["A"-"Z","a"-"z"] (<ArgName>)? > : WithinTag
| < DeclName: "<" "!" ["A"-"Z","a"-"z"] (<ArgName>)? > : WithinTag
| < Comment1: "<!--" > : WithinComment1
| < Comment2: "<!" > : WithinComment2
| < Word: ( <LET> | <LET> (["+","/"])+ | <NUM> ["\""] |
<LET> ["-","'"] <LET> | ("$")? <NUM> [",","."] <NUM> )+ >
| < #LET: ["A"-"Z","a"-"z","0"-"9"] >
| < #NUM: ["0"-"9"] >
| < CJK: // non-alphabets
[
"\u3040"-"\u318f",
"\u3300"-"\u337f",
"\u3400"-"\u3d2d",
"\u4e00"-"\u9fff",
"\uf900"-"\ufaff"
]
>
| < Entity: ( "&" (["A"-"Z","a"-"z"])+ (";")? | "&" "#" (<NUM>)+ (";")? ) >
| < Space: (<SP>)+ >
| < #SP: [" ","\t","\r","\n"] >
| < Punct: ~[] > // Keep this last. It is a catch-all.
}
<WithinScript> TOKEN:
{
< ScriptText: (~["<",">"])+ | "<" | ">" >
| < ScriptEnd: "</script" (~["<",">"])* ">" > : DEFAULT
}
<WithinTag> TOKEN:
{
< ArgName: (~[" ","\t","\r","\n","=",">","'","\""])
(~[" ","\t","\r","\n","=",">"])* >
| < ArgEquals: "=" > : AfterEquals
| < TagEnd: ">" | "=>" > : DEFAULT
}
<AfterEquals> TOKEN:
{
< ArgValue: (~[" ","\t","\r","\n","=",">","'","\""])
(~[" ","\t","\r","\n",">"])* > : WithinTag
}
<WithinTag, AfterEquals> TOKEN:
{
< ArgQuote1: "'" > : WithinQuote1
| < ArgQuote2: "\"" > : WithinQuote2
}
<WithinTag, AfterEquals> SKIP:
{
< <Space> >
}
<WithinQuote1> TOKEN:
{
< Quote1Text: (~["'"])+ >
| < CloseQuote1: <ArgQuote1> > : WithinTag
}
<WithinQuote2> TOKEN:
{
< Quote2Text: (~["\""])+ >
| < CloseQuote2: <ArgQuote2> > : WithinTag
}
<WithinComment1> TOKEN :
{
< CommentText1: (~["-"])+ | "-" >
| < CommentEnd1: "-->" > : DEFAULT
}
<WithinComment2> TOKEN :
{
< CommentText2: (~[">"])+ >
| < CommentEnd2: ">" > : DEFAULT
}
250a251
> | t=<CJK> { addText(t.image); afterTag = false; }
362a364,374
> | < CJK: // non-alphabets
> [
> "\u3040"-"\u318f",
> "\u3300"-"\u337f",
> "\u3400"-"\u3d2d",
> "\u4e00"-"\u9fff",
> "\uf900"-"\ufaff"
> ]
> >
>
>
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