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# Copyright 2014 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import collections
import os
class PathSet(collections.MutableSet):
"""A set of paths.
All mutation methods can take both directories or individual files, but the
iterator yields the individual files. All paths are automatically normalized.
"""
def __init__(self, iterable=None):
self._paths = set()
if iterable:
self |= iterable
def __contains__(self, path):
return os.path.realpath(path) in self._paths
def __iter__(self):
return iter(self._paths)
def __len__(self):
return len(self._paths)
def add(self, path):
path = os.path.realpath(path)
if os.path.isfile(path):
self._paths.add(path)
for root, _, files in os.walk(path):
for basename in files:
file_path = os.path.join(root, basename)
if os.path.isfile(file_path):
self._paths.add(file_path)
def discard(self, path):
path = os.path.realpath(path)
self._paths.discard(path)
for root, _, files in os.walk(path):
for basename in files:
self._paths.discard(os.path.join(root, basename))
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