[Xapian-tickets] [Xapian] #521: Precedence of HATE is surprising

[Xapian]

#521: Precedence of HATE is surprising
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 Reporter:  olly         |       Owner:  olly 
     Type:  defect       |      Status:  new  
 Priority:  normal       |   Milestone:  1.2.x
Component:  QueryParser  |     Version:  1.2.3
 Severity:  normal       |    Keywords:       
Blockedby:               |    Platform:  All  
 Blocking:               |  
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Comment(by olly):

 There are some problems with the grammar in grammar.out.

 One is easily fixed - expr can be a term but can also be a prob which can
 be a term.
 I think you don't want to allow expr to be a term directly.

 The rules for group and phrase_term also seem to be wrong - these needs to
 start with a TERM, but your rules seem to mean it's the last but one token
 which needs to be a TERM.  I think the recursive rule in each case needs
 its RHS transposing.

 But there are other issues which seem harder to address - for example, you
 can specify arbitrary numbers of PLUS and MINUS in a row (because unop
 loops back to expr).  Also even without that, you can write: term1 PLUS
 PLUS term2 (first PLUS from binop, second from unop).

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Ticket URL: <http://trac.xapian.org/ticket/521#comment:6>
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