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# Copyright (C) 2010 Google Inc.


  		





  
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# Copyright (C) 2010, 2011 Google Inc.


  		





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#


  		





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# This program is free software; you can redistribute it and/or modify


  		





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# it under the terms of the GNU General Public License as published by


  		





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# 02110-1301, USA.


  		





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"""Module for a simple query language"""


  		





  
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"""Module for a simple query language


  		





  
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A query filter is always a list. The first item in the list is the operator


  		





  
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(e.g. C{[OP_AND, ...]}), while the other items depend on the operator. For


  		





  
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logic operators (e.g. L{OP_AND}, L{OP_OR}), they are subfilters whose results


  		





  
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are combined. Unary operators take exactly one other item (e.g. a subfilter for


  		





  
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L{OP_NOT} and a field name for L{OP_TRUE}). Binary operators take exactly two


  		





  
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operands, usually a field name and a value to compare against. Filters are


  		





  
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converted to callable functions by L{query._CompileFilter}.


  		





  
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"""


  		





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from ganeti import errors


  		





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# Logic operators


  		





  
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# Logic operators with one or more operands, each of which is a filter on its


  		





  
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# own


  		





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OP_OR = "|"


  		





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OP_AND = "&"


  		





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# Unary operators


  		





  
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# Unary operators with exactly one operand


  		





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OP_NOT = "!"


  		





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OP_TRUE = "?"


  		





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# Binary operators


  		





  
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# Binary operators with exactly two operands, the field name and an


  		





  
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# operator-specific value


  		





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OP_EQUAL = "="


  		





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OP_NOT_EQUAL = "!="


  		





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OP_GLOB = "=*"


  		












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