|  | #!/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. | 
|  | """ |