[Bugs] #1090 UNSP: refactor indexing/query parsing, add support for prefixes

[SugarLabs Bugs]

#1090: refactor indexing/query parsing, add support for prefixes
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    Reporter:  sascha_silbe               |          Owner:  tomeu                      
        Type:  enhancement                |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar-datastore            |        Version:  Git as of bugdate          
    Severity:  Unspecified                |     Resolution:                             
    Keywords:  r-                         |   Distribution:  Unspecified                
Status_field:  New                        |  
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Changes (by tomeu):

  * keywords:  r? => r-


Comment:

 Do you think would be possible to split this patch in one with the
 refactoring and another(s) with the new feature(s)?

 Please see the PEP 8 about style, more specifically:

 * don't use different coding styles in the same module, much less the same
 file.

 * favour readability over compactness.

 * if you feel the need to add inline comments to make the code more
 understandable, consider changing the code structure so it's clearer what
 the code does. Splitting a line in two and a function in two is very cheap
 in python.

 * consider subclassing xapian.TermGenerator and having _index_prop()
 there.

 * try to avoid using abbreviations in identifiers.

 Thanks for the patch, is it related in some way to
 http://wiki.sugarlabs.org/go/Features/Plain_Query_Format ?

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Ticket URL: <http://dev.sugarlabs.org/ticket/1090#comment:2>
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