| # Copyright 2017 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. |
| """Rules for manipulating paths.""" |
| |
| |
| def dirname(path): |
| """Returns the directory's name.""" |
| last_sep = path.rfind("/") |
| if last_sep == -1: |
| return "" # The artifact is at the top level. |
| return path[:last_sep] |
| |
| |
| def join(directory, path): |
| """Compute the relative data path prefix from the data_path attribute.""" |
| if not path: |
| return directory |
| if path[0] == "/": |
| return path[1:] |
| if directory == "/": |
| return path |
| return directory + "/" + path |
| |
| |
| def canonicalize(path): |
| """Canonicalize the input path.""" |
| if not path: |
| return 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. A path of / should preserve the entire |
| # path up to the repository root. |
| if path == "/": |
| return path |
| if len(path) >= 2 and path[0:2] == "./": |
| path = path[2:] |
| if not path or path == ".": # Relative to current package |
| return "" |
| elif path[0] == "/": # Absolute path |
| return path |
| else: # Relative to a sub-directory |
| return path |
| |
| |
| def strip_prefix(path, prefix): |
| """Returns the path with the specified prefix removed.""" |
| if path.startswith(prefix): |
| return path[len(prefix):] |
| return path |
| |
| |
| def runfile(ctx, f): |
| """Return the runfiles relative path of f.""" |
| if ctx.workspace_name: |
| return ctx.workspace_name + "/" + f.short_path |
| else: |
| return f.short_path |
