[LUCENE-5826] Support proper hunspell case handling and related options

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 4.10, 6.0
• Lucene Fields: New
• Assignee: Unassigned
• Reporter: Robert Muir
• Created: 16/Jul/14 04:49
• Updated: 28/Aug/22 14:12
• Resolved: 16/Jul/14 20:18

Description

When ignoreCase=false, we should accept title-cased/upper-cased forms just like hunspell -m. Furthermore there are some options around this:

• LANG: can turn on alternate casing for turkish/azeri
• KEEPCASE: can prevent acceptance of title/upper cased forms for words

While we are here setting up the same logic anyway, add support for similar options:

• NEEDAFFIX/PSEUDOROOT: form is invalid without being affixed
• ONLYINCOMPOUND: form/affixes only make sense inside compounds.

This stuff is unrelated to the ignoreCase=true option. If you use that option though, it does use correct alternate casing for tr_TR/az_AZ now though.

I didn't yet implement CHECKSHARPS because it seems more complicated, I have to figure out what the logic there should be first.