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# Copyright 2016 The Bazel Authors. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Helper functions that don't depend on Skylark, so can be unit tested."""
def _short_path_dirname(path):
"""Returns the directory's name of the short path of an artifact."""
sp = path.short_path
last_pkg = sp.rfind("/")
if last_pkg == -1:
# Top-level BUILD file.
return ""
return sp[:last_pkg]
def dest_path(f, strip_prefix):
"""Returns the short path of f, stripped of strip_prefix."""
if strip_prefix == None:
# If no strip_prefix was specified, use the package of the
# given input as the strip_prefix.
strip_prefix = _short_path_dirname(f)
if not strip_prefix:
return f.short_path
if f.short_path.startswith(strip_prefix):
return f.short_path[len(strip_prefix):]
return f.short_path
def compute_data_path(out, data_path):
"""Compute the relative data path prefix from the data_path attribute."""
if data_path:
# Strip ./ from the beginning if specified.
# There is no way to handle .// correctly (no function that would make
# that possible and Skylark is not turing complete) so just consider it
# as an absolute path.
if len(data_path) >= 2 and data_path[0:2] == "./":
data_path = data_path[2:]
if not data_path or data_path == ".": # Relative to current package
return _short_path_dirname(out)
elif data_path[0] == "/": # Absolute path
return data_path[1:]
else: # Relative to a sub-directory
tmp_short_path_dirname = _short_path_dirname(out)
if tmp_short_path_dirname:
return tmp_short_path_dirname + "/" + data_path
return data_path
else:
return None
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