[LUCENE-4019] Parsing Hunspell affix rules without regexp condition

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.6
• Fix Version/s: 4.0-ALPHA, 6.0
• Component/s: modules/analysis
• Lucene Fields: New
• Assignee: Chris Male
• Reporter: Luca Cavanna
• Created: 24/Apr/12 13:54
• Updated: 09/May/16 18:35
• Resolved: 01/Jun/12 05:21

Description

We found out that some recent Dutch hunspell dictionaries contain suffix or prefix rules like the following:

 
SFX Na N 1
SFX Na 0 ste

The rule on the second line doesn't contain the 5th parameter, which should be the condition (a regexp usually). You can usually see a '.' as condition, meaning always (for every character). As explained in LUCENE-3976 the readAffix method throws error. I wonder if we should treat the missing value as a kind of default value, like '.'. On the other hand I haven't found any information about this within the spec. Any thoughts?