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 ��
and not as 𐐀
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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