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103 lines
3.4 KiB
103 lines
3.4 KiB
# Copyright 2018 The Bazel Authors. All rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Bazel Path APIs for the Android rules."""
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# TODO(djwhang): Get the path separator in a platform agnostic manner.
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_PATH_SEP = "/"
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_TEST_SRCDIR = "${TEST_SRCDIR}"
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def _is_absolute(path):
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# TODO(djwhang): This is not cross platform safe. Windows absolute paths
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# do not start with "//", rather "C:\".
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return path.startswith(_PATH_SEP)
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def _split(path):
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return path.split(_PATH_SEP)
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def _join(path_segments):
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return _PATH_SEP.join(path_segments)
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def _normalize_path(path, posix = False):
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return _PATH_SEP.join(
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_normalize_path_fragments(
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path.split(_PATH_SEP),
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posix = posix,
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),
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)
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def _normalize_path_fragments(path_fragments, posix = False):
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normalized_path_fragments = []
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for idx, fragment in enumerate(path_fragments):
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if not fragment and idx > 0:
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continue
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if fragment == ".":
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continue
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if fragment == ".." and not posix:
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if normalized_path_fragments:
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last = normalized_path_fragments.pop()
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if last == ".." or last == "":
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normalized_path_fragments.append(last)
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else:
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continue
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normalized_path_fragments.append(fragment)
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if len(normalized_path_fragments) == 1 and not normalized_path_fragments[0]:
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normalized_path_fragments.append("")
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return normalized_path_fragments
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def _relative_path(path1, path2):
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if not path1 or _is_absolute(path2):
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return path2
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path1_fragments = _normalize_path_fragments(_split(path1))
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path2_fragments = _normalize_path_fragments(_split(path2))
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path1_idx = len(path1_fragments) # index move backwards
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path2_idx = -1
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for idx, fragment in enumerate(path2_fragments):
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if fragment == "..":
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path1_idx -= 1
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else:
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path2_idx = idx
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break
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relative_path_fragments = []
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if path1_idx >= 0:
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relative_path_fragments.extend(path1_fragments[:path1_idx])
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if path2_idx >= 0:
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relative_path_fragments.extend(path2_fragments[path2_idx:])
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return _join(_normalize_path_fragments(relative_path_fragments))
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def _make_test_srcdir_path(ctx, *path_fragments):
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"""Creates a filepath relative to TEST_SRCDIR.
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Args:
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ctx: Starlark context.
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*path_fragments: Directories/file to join into a single path.
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Returns:
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A filepath that's spearated by the host's filepath separator.
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"""
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fragments = [_TEST_SRCDIR, ctx.workspace_name]
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for path_fragment in path_fragments:
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fragments += _normalize_path_fragments(_split(path_fragment))
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return _join(fragments)
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path = struct(
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is_absolute = _is_absolute,
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join = _join,
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normalize = _normalize_path,
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relative = _relative_path,
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split = _split,
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make_test_srcdir_path = _make_test_srcdir_path,
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)
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