[jira] [Created] (LUCENE-5191) SimpleHTMLEncoder in Highlighter module breaks Unicode outside BMP

["Uwe Schindler (JIRA)" <ji...@apache.org>]

Uwe Schindler created LUCENE-5191:
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             Summary: SimpleHTMLEncoder in Highlighter module breaks Unicode outside BMP
                 Key: LUCENE-5191
                 URL: https://issues.apache.org/jira/browse/LUCENE-5191
             Project: Lucene - Core
          Issue Type: Bug
          Components: modules/highlighter
            Reporter: Uwe Schindler
            Assignee: Uwe Schindler
             Fix For: 5.0, 4.5


The highlighter provides a function to escape HTML, which does to much. To create valid HTML only ", <, >, & must be escaped, everything else can kept unescaped. The escaper unfortunately does also additionally escape everything > 127, which is unneeded if your web site has the correct encoding. It also produces huge amounts of HTML entities if used with eastern languages.

This would not be a bugf if the escaping would be correct, but it isn't, it escapes like that:

{{result.append("&#").append((int)ch).append(";");}}

So it escapes not (as HTML needs) the unicode codepoint, instead it escapes the UTF-16 char, which is incorrect, e.g. for our all-time favourite Deseret:

U+10400 (deseret capital letter long i) would be escaped as &#55297;&#56320; and not as &#66560;

So we should remove the stupid encoding of chars > 127 which is simply useless :-)


See also: https://github.com/elasticsearch/elasticsearch/issues/3587

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