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From "Steven Rowe (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1390) add ISOLatinAccentFilter and deprecate ISOLatin1AccentFilter
Date Tue, 30 Sep 2008 00:24:44 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12635620#action_12635620
] 

Steven Rowe commented on LUCENE-1390:
-------------------------------------

Forgot to mention three additional change in ASCIIFoldingFilter.patch:

# Some of the added character mappings produce 3 or 4 characters - e.g. the character "⑾
" -- described as "PARENTHESIZED NUMBER ELEVEN" -- is mapped to '('+'1'+'1'+')'. 
# As a result of the increased maximum length of each mapping, the output buffer length is
set to 4 times the length of the input token.
# ArrayUtils.getNextSize() is used to resize the output buffer when it needs to grow.

> add ISOLatinAccentFilter and deprecate ISOLatin1AccentFilter
> ------------------------------------------------------------
>
>                 Key: LUCENE-1390
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1390
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Analysis
>         Environment: any
>            Reporter: Andi Vajda
>            Priority: Minor
>             Fix For: 2.9
>
>         Attachments: ASCIIFoldingFilter.patch, ISOLatinAccentFilter.java
>
>
> The ISOLatin1AccentFilter is removing accents from accented characters in the ISO Latin
1 character set.
> It does what it does and there is no bug with it.
> It would be nicer, though, if there was a more comprehensive version of this code that
included not just ISO-Latin-1 (ISO-8859-1) but the entire Latin 1 and Latin Extended A unicode
blocks.
> See: http://en.wikipedia.org/wiki/Latin-1_Supplement_unicode_block
> See: http://en.wikipedia.org/wiki/Latin_Extended-A_unicode_block
> That way, all languages using roman characters are covered.
> A new class, ISOLatinAccentFilter is attached. It is intended to supercede ISOLatin1AccentFilter
which should get deprecated.

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