That fix works perfectly, as far as I can tell.
As for the unit test, it should actually be:
assertEquals("\\\\192.168.0.15\\public", discardEscapeChar
("\\\\\\\\192.168.0.15\\\\public"));
Jeff
On 7/20/05, Eyal <[EMAIL PROTECTED]> wrote:
> I think this should work:
>
> (Written in C# originally - so someone please check if it compiles - I don't
> have a java compiler here)
>
> private String discardEscapeChar(String input)
> {
> char[] caSource = input.toCharArray();
> char[] caDest = new char[caSource.length];
> int j = 0;
>
> for (int i = 0; i < caSource.length; i++)
> {
> if (caSource[i] == '\\')
> {
> if (caSource.length == ++i)
> break;
> }
> caDest[j++]=caSource[i];
> }
> return new String(caDest, 0, j);
> }
>
>
> Regarding your UnitTest - It think it's wrong:
>
> > assertEquals("\\\\\\\\192.168.0.15\\\\public",
> > discardEscapeChar ("\\\\192.168.0.15\\\\public"));
>
> It should be: assertEquals("\\\\192.168.0.15\\\\public", discardEscapeChar
> ("\\\\\\\\192.168.0.15\\\\public"));
>
> I would also suggest to add the following:
> String s="\\\\some.host.name\\dir+:+-!():^[]\{}~*?";
> assertEquals(s,discardEscapeChar(escape(s)));
>
> Eyal
>
> > -----Original Message-----
> > From: Erik Hatcher [mailto:[EMAIL PROTECTED]
> > Sent: Wednesday, July 20, 2005 22:38 PM
> > To: java-user@lucene.apache.org
> > Subject: Re: QueryParser handling of backslash characters
> >
> >
> > On Jul 19, 2005, at 11:19 AM, Jeff Davis wrote:
> >
> > > Hi,
> > >
> > > I'm seeing some strange behavior in the way the QueryParser handles
> > > consecutive backslash characters. I know that backslash is
> > the escape
> > > character in Lucene, and so I would expect "\\\\" to match
> > fields that
> > > have two consecutive backslashes, but this does not seem to be the
> > > case.
> > >
> > > The fields I'm searching are UNC paths, e.g.
> > "\\192.168.0.15\public".
> > > The only way I can get my query to find the record containing that
> > > value is to type "FieldName:\\\192.168.0.15\\public" (three
> > slashes).
> > > Why is the third backslash character not treated as an
> > escape? Is it
> > > just that any backslash that is preceded by a backslash is
> > interpreted
> > > as a literal backslash character, regardless of whether the "escape"
> > > backslash was itself escaped?
> > >
> > > I can code around this, but it seems inconsistent with the way that
> > > escape characters usually work. Is this a bug, or is it
> > intentional,
> > > or am I missing something?
> >
> > I've waited until I had a chance to experiment with this
> > before replying. I say that this is a bug. There is a
> > private method in QueryParser called discardEscapeChar (shown
> > below). I copied it to a JUnit test case and gave it this assert:
> >
> > assertEquals("\\\\\\\\192.168.0.15\\\\public",
> > discardEscapeChar ("\\\\192.168.0.15\\\\public"));
> >
> > This test fails with:
> >
> > Expected:\\\\192.168.0.15\\public
> > Actual :\192.168.0.15\public
> >
> > Which is wrong in my opinion. (though my head hurts thinking
> > about metaescaping backslashes in Java code to make this a
> > proper test)
> >
> > The bug is isolated to the discardEscapeChar() method where
> > it eats too many backslashes. Could you have a shot at
> > tweaking that method to do the right thing and submit a patch?
> >
> > private String discardEscapeChar(String input) {
> > char[] caSource = input.toCharArray();
> > char[] caDest = new char[caSource.length];
> > int j = 0;
> > for (int i = 0; i < caSource.length; i++) {
> > if ((caSource[i] != '\\') || (i > 0 && caSource[i-1]
> > == '\\')) {
> > caDest[j++]=caSource[i];
> > }
> > }
> > return new String(caDest, 0, j);
> > }
> >
> > Erik
> >
> >
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> > For additional commands, e-mail: [EMAIL PROTECTED]
> >
> >
> >
>
>
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