def __init__(self, arg1, arg2=Undef, on=Undef):
# http://www.postgresql.org/docs/8.1/interactive/explicit-joins.html
if arg2 is Undef:
self.left = Undef
self.right = arg1
self.on = on
elif not isinstance(arg2, Expr) or isinstance(arg2, (FromExpr, Alias)):
self.left = arg1
self.right = arg2
self.on = on
else:
self.left = Undef
self.right = arg1
self.on = arg2
if on is not Undef:
raise ExprError("Improper join arguments: (%r, %r, %r)" %
(arg1, arg2, on))
def endswith(self, suffix):
if not isinstance(suffix, unicode):
raise ExprError("Expected unicode argument, got %r" % type(suffix))
pattern = u"%" + suffix.translate(like_escape)
return Like(self, pattern, u"!")
def contains_string(self, substring):
if not isinstance(substring, unicode):
raise ExprError("Expected unicode argument, got %r" %
type(substring))
pattern = u"%" + substring.translate(like_escape) + u"%"
return Like(self, pattern, u"!")
def startswith(self, prefix):
if not isinstance(prefix, unicode):
raise ExprError("Expected unicode argument, got %r" % type(prefix))
pattern = prefix.translate(like_escape) + u"%"
return Like(self, pattern, u"!")
