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Viewing changes to openerprows/criteria.py

  • Committer: Vo Minh Thu
  • Date: 2011-04-19 20:23:48 UTC
  • Revision ID: vmt@openerp.com-20110419202348-1a14chzvz0usswlx
criteria to domain conversion.

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openerprows/criteria.py
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class criteria(object):
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  def __init__(self, *ast):
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    # TODO add some checking
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    self.ast = tuple(ast)
 
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    if len(ast):
 
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      self.ast = tuple(ast)
 
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    else:
 
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      self.ast = True
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  def __getattr__(self, field_name):
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    return criteria_field(self, field_name)
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    return str(self.ast)
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  def __and__(self, other):
 
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    if self.ast is True:
 
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      return other
 
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    elif other.ast is True:
 
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      return self
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    return criteria('&', self.ast, other.ast)
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  def __or__(self, other):
 
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    if self.ast is False:
 
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      return self
 
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    elif other.ast is False:
 
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      return other
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    return criteria('|', self.ast, other.ast)
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  # TODO the other way around: transform a domain into a criteria and
 
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  # use criteria as the underlying implmentation instead of a domain.
 
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  def domain(self):
 
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    def to_domain(ast):
 
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      if ast is True:
 
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        return []
 
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      if ast[0] == '<':
 
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        return [(to_domain1(ast[1]), '<', to_domain1(ast[2]))]
 
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      elif ast[0] == '>':
 
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        return [(to_domain1(ast[1]), '>', to_domain1(ast[2]))]
 
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      elif ast[0] == '&':
 
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        return ['&'] + to_domain(ast[1]) + to_domain(ast[2])
 
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      elif ast[0] == 'like':
 
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        return [(to_domain1(ast[1]), 'like', to_domain1(ast[2]))]
 
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      return [] # TODO can't happen
 
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    def to_domain1(operand):
 
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      if isinstance(operand, tuple) and len(operand) == 2 and operand[0] == 'field':
 
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        return operand[1]
 
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      return operand
 
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    return to_domain(self.ast)
 
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class criteria_field(object):
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  def __init__(self, crit, field_name):
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    self.crit = crit
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  def __gt__(self, other):
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    return self.build_binary('>', other)
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  def __getattr__(self, name):
 
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    def f(strg):
 
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      return criteria('like', ('field', self.field_name), strg)
 
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    if name == 'like':
 
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      return f
 
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if __name__ == '__main__':
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  pass