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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 38456] New: - Problem with infinate loop detection in FilterSet
Date Mon, 30 Jan 2006 18:38:06 GMT
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http://issues.apache.org/bugzilla/show_bug.cgi?id=38456

           Summary: Problem with infinate loop detection in FilterSet
           Product: Ant
           Version: 1.6.5
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Core
        AssignedTo: dev@ant.apache.org
        ReportedBy: rmorgan@pobox.com


We use ant's FilterSet to perform token replacement on text to convert auto-generated HTML
help to 
SGML.  We recently upgraded from ant 1.5.4 to ant 1.6.5, which appears to have broken the
detection 
of infinite loops in the token replacement.

Example code:

        FilterSet filters = new FilterSet();

        filters.setBeginToken("<");
        filters.setEndToken(">");

        filters.addFilter("ul", "<itemizedlist>");
        filters.addFilter("/ul", "</itemizedList>");
        filters.addFilter("li", "<listitem>");
        filters.addFilter("/li", "</listitem>");

        String html =
            "<ul>" +
            "  <li>Item 1</li>" +
            "  <li>Item 2</li>" +
            "</ul>";

        String sgml = filters.replaceTokens(html);

This code results in an error saying that there is an infinite loop in the replacement of
tokens.  Note 
though, that none of the replaced properties reference a token that would cause an infinite
loop.

Output with ant 1.6.5:

Infinite loop in tokens. Currently known tokens : [ul, li, /li]
Problem token : <li> called from </li>
HTML: <ul>  <li>Item 1</li>  <li>Item 2</li></ul>
SGML: <itemizedlist>  <listitem>Item 1</listitem>  liItem 2/li/ul

Output with ant 1.5.4:

HTML: <ul>  <li>Item 1</li>  <li>Item 2</li></ul>
SGML: <itemizedlist>  <listitem>Item 1</listitem>  <listitem>Item
2</listitem></itemizedList>

I'll attach my test case.

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