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From "Matt Magoffin" <apache....@msqr.us>
Subject Re: QueryParser exception on escaped backslash preceding ) character
Date Fri, 12 Aug 2005 21:04:05 GMT
Sure:

import junit.framework.TestCase;

import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.search.Query;

public class TestLuceneBackslashBug extends TestCase {

	public void testLuceneBackslashBug() throws Exception {
		// this fails
		Query q = new QueryParser("foo",new StandardAnalyzer()).parse(
			"-id:123 +(addr:Street143 AND zip:\\\\)");
	}

	public void testLuceneBackslashBugWorkaround() throws Exception {
		// this passes
		Query q = new QueryParser("foo",new StandardAnalyzer()).parse(
			"-id:123 +(addr:Street143 AND zip:\\\\ )");
	}

}

>
> the mailing list isn't fond of attachemnts ... can you inline it in your
> email?
>
> : Date: Fri, 12 Aug 2005 12:09:55 -0700 (PDT)
> : From: Matt Magoffin <apache.org@msqr.us>
> : Reply-To: java-user@lucene.apache.org
> : To: java-user@lucene.apache.org
> : Subject: Re: QueryParser exception on escaped backslash preceding )
> :        character
> :
> : Sure, here's a test case with the bug and the workaround.
> :
> : -- m@
> :
> : > can you provide a JUnit test that genertes the exception ... if it's
> : > coming from the parse call it should only require a 1 line test.
> : >
> : > : Date: Fri, 12 Aug 2005 10:29:41 -0700 (PDT)
> : > : From: Matt Magoffin <apache.org@msqr.us>
> : > : Reply-To: java-user@lucene.apache.org
> : > : To: java-user@lucene.apache.org
> : > : Subject: Re: QueryParser exception on escaped backslash preceding )
> : > :     character
> : > :
> : > : The strings are not coming from Java literals, actually, so I didn't
> : > think
> : > : that was the problem.
> : > :
> : > : Any other thoughts?
> : > :
> : > : -- m@
> : > :
> : > : > I think you are encountering a "double escape" problem in java
> : > literals.
> : > : > QP is seeing a backslash in front of the ) and waiting for you to
> : > finish
> : > : > the paren grouping.
> : > : >
> : > : > how are you passing that string to the QP, is it embedded in your
> java
> : > : > code?  if so the java compiler is interpreting your \\ and your
> java
> : > app
> : > : > is never seeing it.
> : > : >
> : > : > : Date: Fri, 12 Aug 2005 07:30:19 -0700 (PDT)
> : > : > : From: Matt Magoffin <apache.org@msqr.us>
> : > : > : Reply-To: java-user@lucene.apache.org
> : > : > : To: java-user@lucene.apache.org
> : > : > : Subject: QueryParser exception on escaped backslash preceding )
> : > : > character
> : > : > :
> : > : > : When I try to parse a query with an escaped backslash character
> like
> : > : > this
> : > : > : (using Lucene 1.4.3):
> : > : > :
> : > : > : -id:20677 +(addr:Street143 AND zip:\\)
> : > : > :
> : > : > : the QueryParser thows an Exception:
> : > : > :
> : > : > : Encountered "<EOF>" at line 1, column 289.
> : > : > : 			Was expecting one of: <AND> ... <OR> ...
> : > : > : 			<NOT> ... "+" ... "-" ... "(" ... ")" ... "^" ...
> : > : > : 			<QUOTED> ... <TERM> ...
> : > : > : 			<PREFIXTERM> ... <WILDTERM> ... "[" ...
> : > : > : 			"{" ... <NUMBER> ...
> : > : > :
> : > : > : However, if I insert a space between the backslash and the
> : > parenthesis:
> : > : > :
> : > : > : -id:20677 +(addr:Street143 AND zip:\\ )
> : > : > :
> : > : > : it works. Is this expected behavior or perhaps a bug in the
> : > QueryParser?
> : > : > :
> : > : > : -- m@
> : > : > :
> : > : > :
> : > ---------------------------------------------------------------------
> : > : > : To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> : > : > : For additional commands, e-mail:
> java-user-help@lucene.apache.org
> : > : > :
> : > : >
> : > : >
> : > : >
> : > : > -Hoss
> : > : >
> : > : >
> : > : >
> ---------------------------------------------------------------------
> : > : > To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> : > : > For additional commands, e-mail: java-user-help@lucene.apache.org
> : > : >
> : > : >
> : > :
> : > :
> : > :
> ---------------------------------------------------------------------
> : > : To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> : > : For additional commands, e-mail: java-user-help@lucene.apache.org
> : > :
> : >
> : >
> : >
> : > -Hoss
> : >
> : >
> : > ---------------------------------------------------------------------
> : > To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> : > For additional commands, e-mail: java-user-help@lucene.apache.org
> : >
> : >
> :
> :
>
>
>
> -Hoss
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> For additional commands, e-mail: java-user-help@lucene.apache.org
>
>


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