You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@lucene.apache.org by "Adrien Grand (JIRA)" <ji...@apache.org> on 2016/06/09 14:21:21 UTC
[jira] [Resolved] (LUCENE-4730) SmartChineseAnalyzer got wrong
matched offset
[ 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.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscribe@lucene.apache.org
For additional commands, e-mail: dev-help@lucene.apache.org