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From "Adrien Grand (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (LUCENE-4730) SmartChineseAnalyzer got wrong matched offset
Date Thu, 09 Jun 2016 14:21:21 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-4730?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Adrien Grand resolved LUCENE-4730.
----------------------------------
    Resolution: Fixed

Thanks Michael for digging it.

> SmartChineseAnalyzer got wrong matched offset
> ---------------------------------------------
>
>                 Key: LUCENE-4730
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4730
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: modules/analysis
>    Affects Versions: 4.0, 4.1
>         Environment: JDK1.7 Linux/Windows
>            Reporter: Jinsong Hu
>            Priority: Critical
>         Attachments: LUCENE-4730.patch
>
>
> We found that SmartChineseAnalyzer got wrong matched offset with the following test code:
>     public void testHighlight() throws Exception {
>         String text = "My China  ";        
>         String queryText = "China";
>         StringBuilder builder = new StringBuilder("<html>");
>         Analyzer analyzer = new SmartChineseAnalyzer(Version.LUCENE_40);
>         //Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_40);
>         QueryParser parser = new QueryParser(Version.LUCENE_40, "text", analyzer);
>         Query query = parser.parse(queryText);
>         SimpleHTMLFormatter formatter = new SimpleHTMLFormatter("<span style=\"background:
yellow\">", "</span>");
>         TokenStream tokens = analyzer.tokenStream("text", new StringReader(text));
>         QueryScorer scorer = new QueryScorer(query, "text");
>         Highlighter highlighter = new Highlighter(formatter, scorer);
>         highlighter.setTextFragmenter(new SimpleSpanFragmenter(scorer));
>         String result = highlighter.getBestFragments(tokens, text, 10, "...");
>         if (result.length() < text.length()) {
>             result = text;
>         }
>         builder.append("<body>");
>         builder.append(result);
>         builder.append("</body>");
>         builder.append("</html>");
>         System.out.println(builder.toString());
>     }
> This method will generate a hilighted text, however, the highlight position is obviously
wrong, and if we remove one space from the text, that is, change text from "My China  " (ends
with two spaces) to "My China " (ends with one space), it will generate a text with correct
highlight. If we change the analyzer from SmartChineseAnalyzer to StandardAnalyzer, the highlight
issue will disappear.



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