| # Copyright 2026 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. |
| """Helpers for passing possibly duplicated labels through rule attributes.""" |
| |
| def deduplicate_label_list(name, labels): |
| """Deduplicates a label list while preserving the original indexes. |
| |
| Args: |
| name: Name of the macro target using this helper. |
| labels: Labels to normalize and deduplicate. |
| |
| Returns: |
| A struct with deduplicated labels and original-to-deduplicated indexes. |
| """ |
| deduplicated_labels = {} |
| index_for_label = [] |
| |
| for label in labels: |
| package_relative_label = native.package_relative_label(label) |
| if package_relative_label not in deduplicated_labels: |
| deduplicated_labels[package_relative_label] = len(deduplicated_labels) |
| index_for_label.append(deduplicated_labels[package_relative_label]) |
| |
| return struct( |
| labels = deduplicated_labels.keys(), |
| indexes = index_for_label, |
| ) |
