[jira] Updated: (LUCENE-800) Incorrect parsing by QueryParser.parse() when it encounters backslashes (always eats one backslash.)

["Michael Busch (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-800?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Busch updated LUCENE-800:
---------------------------------

    Priority: Minor  (was: Major)

just lowering the severity to minor

> Incorrect parsing by QueryParser.parse() when it encounters backslashes (always eats one backslash.)
> ----------------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-800
>                 URL: https://issues.apache.org/jira/browse/LUCENE-800
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: QueryParser
>            Reporter: Dilip Nimkar
>         Assigned To: Michael Busch
>            Priority: Minor
>
> Test code and output follow. Tested  Lucene 1.9 version only. Affects hose who would index/search for Lucene's reserved characters.
> Description: When an input search string has a sequence of N (java-escaped) backslashes, where N >= 2, the QueryParser will produce a query in which that sequence has N-1 backslashes.
> TEST CODE:
>     Analyzer analyzer = new WhitespaceAnalyzer();
>     String[] queryStrs = {"item:\\\\",
>                           "item:\\\\*",
>                           "(item:\\\\ item:ABCD\\\\))",
>                           "(item:\\\\ item:ABCD\\\\)"};
>     for (String queryStr : queryStrs) {
>       System.out.println("--------------------------------------");
>       System.out.println("String queryStr = " + queryStr);
>       Query luceneQuery = null;
>       try {
>         luceneQuery = new QueryParser("_default_", analyzer).parse(queryStr);
>         System.out.println("luceneQuery.toString() = " + luceneQuery.toString());
>       } catch (Exception e) {
>         System.out.println(e.getClass().toString());
>       }
>     }
> OUTPUT (with remarks in comment notation:) 
> --------------------------------------
> String queryStr = item:\\
> luceneQuery.toString() = item:\             //One backslash has disappeared. Searcher will fail on this query.
> --------------------------------------
> String queryStr = item:\\*
> luceneQuery.toString() = item:\*           //One backslash has disappeared. This query will search for something unintended.
> --------------------------------------
> String queryStr = (item:\\ item:ABCD\\))
> luceneQuery.toString() = item:\ item:ABCD\)     //This should have thrown a ParseException because of an unescaped ')'. It did not.
> --------------------------------------
> String queryStr = (item:\\ item:ABCD\\)
> class org.apache.lucene.queryParser.ParseException        //...and this one should not have, but it did.

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