def AssertNot(expression):
return Expression.Assert(expression, invert=1)
return Expression.AtBeginning()
elif where == "at_end":
return Expression.AtEnd()
raise AssertionError("Unknown at name: %s" % repr(where))
# Convert an 'any' tuple into a Dot object
def convert_any(group_names, name, ignore):
assert ignore is None, "what does it mean when the field is '%s'?" % ignore
return Expression.Dot()
# Convert an 'assert' tuple into a Assert object, as a positive assertion
def convert_assert(group_names, name, (direction, terms)):
assert direction == 1, "does not support lookbehind"
return Expression.Assert(convert_list(group_names, terms), 0)
# Convert an 'assert_not' tuple into a Assert object, as a negative assertion
def convert_assert_not(group_names, name, (direction, terms)):
assert direction == 1, "does not support lookbehind"
return Expression.Assert(convert_list(group_names, terms), 1)
# Convert a 'branch' tuple into an Alt object
def convert_branch(group_names, name, (ignore, branches)):
assert ignore is None, "what is %s?" % repr(ignore)
results = []
for branch in branches:
results.append(convert_list(group_names, branch))
if len(results) == 1:
def Assert(expression):
return Expression.Assert(expression)
