diff options
Diffstat (limited to 'scss/types.py')
| -rw-r--r-- | scss/types.py | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/scss/types.py b/scss/types.py index 3351f7f..d0079d3 100644 --- a/scss/types.py +++ b/scss/types.py @@ -462,7 +462,7 @@ class Number(Value): return wrapped - def to_python_index(self, length, check_bounds=True): + def to_python_index(self, length, check_bounds=True, circular=False): """Return a plain Python integer appropriate for indexing a sequence of the given length. Raise if this is impossible for any reason whatsoever. @@ -477,13 +477,16 @@ class Number(Value): if ret == 0: raise ValueError("Index cannot be zero") - if check_bounds and abs(ret) > length: + if check_bounds and not circular and abs(ret) > length: raise ValueError("Index {0!r} out of bounds for length {1}".format(ret, length)) if ret > 0: - return ret - 1 - else: - return ret + ret -= 1 + + if circular: + ret = ret % length + + return ret @property def has_simple_unit(self): |