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