| #!/usr/bin/env python3 | 
 | # Copyright (C) 2023 The Android Open Source Project | 
 | # | 
 | # 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. | 
 | """ | 
 | Enforce import rules for https://ui.perfetto.dev. | 
 | Directory structure encodes ideas about the expected dependency graph | 
 | of the code in those directories. Both in a fuzzy sense: we expect code | 
 | withing a directory to have high cohesion within the directory and low | 
 | coupling (aka fewer imports) outside of the directory - but also | 
 | concrete rules: | 
 | - "base should not depend on the fronted" | 
 | - "plugins should only directly depend on the public API" | 
 | - "we should not have circular dependencies" | 
 |  | 
 | Without enforcement exceptions to this rule quickly slip in. This | 
 | script allows such rules to be enforced at presubmit time. | 
 | """ |