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expression parser: 

* add more operators
 * allow lists as 'value' of leafs

bzr revid: christophe@tinyerp.com-20080731114642-64hqtx0h4ziobqhu
This commit is contained in:
Christophe Simonis 2008-07-31 13:46:42 +02:00
parent 0e3f0b2a3a
commit 6010603de4
1 changed files with 15 additions and 5 deletions
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20
bin/tools/expression.py
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@ -9,9 +9,12 @@ class expression( object ):
>>> e = [('foo', '=', 'bar')]
>>> expression(e).parse().to_sql()
'foo = bar'
>>> e = [('field', '=', 'value'), ('field', '!=', 'value')]
>>> e = [('id', 'in', [1,2,3])]
>>> expression(e).parse().to_sql()
'( field = value AND field != value )'
'id in (1, 2, 3)'
>>> e = [('field', '=', 'value'), ('field', '<>', 'value')]
>>> expression(e).parse().to_sql()
'( field = value AND field <> value )'
>>> e = [('&', ('field', '<', 'value'), ('field', '>', 'value'))]
>>> expression(e).parse().to_sql()
'( field < value AND field > value )'
@ -39,13 +42,18 @@ class expression( object ):
"""
def _is_operator( self, element ):
return isinstance( element, str ) and element in ['&','|']
return isinstance( element, str ) \
and element in ['&','|']
def _is_leaf( self, element ):
return isinstance( element, tuple ) and len( element ) == 3 and element[1] in ['=', '<>', '!=', '<=', '<', '>', '>=', 'like', 'not like', 'ilike', 'not ilike']
return isinstance( element, tuple ) \
and len( element ) == 3 \
and element[1] in ('=', '<>', '<=', '<', '>', '>=', 'like', 'not like', 'ilike', 'not ilike', 'in', 'not in', 'child_of')
def _is_expression( self, element ):
return isinstance( element, tuple ) and len( element ) > 2 and self._is_operator( element[0] )
return isinstance( element, tuple ) \
and len( element ) > 2 \
and self._is_operator( element[0] )
def __init__( self, exp ):
if isinstance( exp, tuple ):
@ -68,6 +76,8 @@ class expression( object ):
self.left, self.right = None, None
if self._is_leaf(self.exp):
self.left, self.operator, self.right = self.exp
if isinstance(self.right, list):
self.right = tuple(self.right)
elif not self._is_expression( self.exp ):
raise ValueError, 'Bad expression: %r' % (self.exp,)