mirror of
https://github.com/react/react-native-devtools-frontend.git
synced 2026-09-30 01:07:01 +08:00
92 lines
3.4 KiB
Python
92 lines
3.4 KiB
Python
# Copyright 2016 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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"""
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This ensures that each front-end module does not accidentally rely on a module
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that isn't listed as a transitive dependency in the module.json.
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How this works:
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1. Renames any potential undeclared namespace usage across the entire front-end code
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(e.g. identifiers, strings) into e.g. "$$UndeclaredDependency_SDK$$.Foo".
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2. Closure Compiler catches any illegal usage and safely ignores coincidental
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usages (e.g. "Console.Foo" in a string).
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"""
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import codecs
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import multiprocessing
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from os import path
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import re
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import shutil
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try:
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import simplejson as json
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except ImportError:
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import json
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special_case_namespaces_path = path.join(path.dirname(path.abspath(__file__)), 'special_case_namespaces.json')
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class DependencyPreprocessor(object):
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def __init__(self, descriptors, temp_frontend_path, devtools_frontend_path):
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self.descriptors = descriptors
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self.temp_frontend_path = temp_frontend_path
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self.module_descriptors = descriptors.modules
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self.modules = set(self.descriptors.sorted_modules())
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shutil.copytree(devtools_frontend_path, self.temp_frontend_path)
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with open(special_case_namespaces_path) as json_file:
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self._special_case_namespaces = json.load(json_file)
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def enforce_dependencies(self):
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arg_list = []
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for module in self.modules:
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dependencies = set(self.descriptors.sorted_dependencies_closure(module))
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excluded_modules = self.modules - {module} - dependencies
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excluded_namespaces = [self._map_module_to_namespace(m) for m in excluded_modules]
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file_paths = [
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path.join(self.temp_frontend_path, module, file_name)
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for file_name in self.descriptors.module_compiled_files(module)
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]
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arg = {
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'excluded_namespaces': excluded_namespaces,
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'file_paths': file_paths,
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}
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arg_list.append(arg)
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parallelize(poison_module, arg_list)
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def _map_module_to_namespace(self, module):
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return self._special_case_namespaces.get(module, self._to_camel_case(module))
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def _to_camel_case(self, snake_string):
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components = snake_string.split('_')
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return ''.join(x.title() for x in components)
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def poison_module(target):
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excluded_namespaces = target['excluded_namespaces']
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file_paths = target['file_paths']
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for file_path in file_paths:
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with codecs.open(file_path, 'r', 'utf-8') as file:
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file_contents = file.read()
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file_contents = poison_contents_for_namespaces(file_contents, excluded_namespaces)
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with codecs.open(file_path, 'w', 'utf-8') as file:
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file.write(file_contents)
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def poison_contents_for_namespaces(file_contents, namespaces):
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# Technically, should be [^.]\s*\b + NAMESPACES + \b\s*[^:]
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# but we rely on clang-format to format like this:
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# SomeModule
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# .Console
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regex = r'([^.]\b)(' + '|'.join(namespaces) + r')(\b[^:])'
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replace = r'\1$$UndeclaredDependency_\2$$\3'
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return re.sub(regex, replace, file_contents)
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def parallelize(fn, arg_list):
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number_of_processes = min(multiprocessing.cpu_count(), 8)
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pool = multiprocessing.Pool(number_of_processes)
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pool.map(fn, arg_list)
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pool.close()
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pool.join()
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