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