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- # Copyright 2014 Google Inc. All rights reserved.
- # Use of this source code is governed by a BSD-style license that can be
- # found in the LICENSE file.
- """A clone of the default copy.deepcopy that doesn't handle cyclic
- structures or complex types except for dicts and lists. This is
- because gyp copies so large structure that small copy overhead ends up
- taking seconds in a project the size of Chromium."""
- class Error(Exception):
- pass
- __all__ = ["Error", "deepcopy"]
- def deepcopy(x):
- """Deep copy operation on gyp objects such as strings, ints, dicts
- and lists. More than twice as fast as copy.deepcopy but much less
- generic."""
- try:
- return _deepcopy_dispatch[type(x)](x)
- except KeyError:
- raise Error('Unsupported type %s for deepcopy. Use copy.deepcopy ' +
- 'or expand simple_copy support.' % type(x))
- _deepcopy_dispatch = d = {}
- def _deepcopy_atomic(x):
- return x
- for x in (type(None), int, long, float,
- bool, str, unicode, type):
- d[x] = _deepcopy_atomic
- def _deepcopy_list(x):
- return [deepcopy(a) for a in x]
- d[list] = _deepcopy_list
- def _deepcopy_dict(x):
- y = {}
- for key, value in x.iteritems():
- y[deepcopy(key)] = deepcopy(value)
- return y
- d[dict] = _deepcopy_dict
- del d
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