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# Copyright 2015 gRPC authors.
#
# 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.
"""Buildgen transitive dependencies
This takes the list of libs, node_modules, and targets from our
yaml dictionary, and adds to each the transitive closure
of the list of dependencies.
"""
def transitive_deps(lib_map, node):
"""Returns a list of transitive dependencies from node.
Recursively iterate all dependent node in a depth-first fashion and
list a result using a topological sorting.
"""
result = []
seen = set()
start = node
def recursive_helper(node):
if node is None:
return
for dep in node.get("deps", []):
if dep not in seen:
seen.add(dep)
next_node = lib_map.get(dep)
recursive_helper(next_node)
if node is not start:
result.insert(0, node["name"])
recursive_helper(node)
return result
def mako_plugin(dictionary):
"""The exported plugin code for transitive_dependencies.
Iterate over each list and check each item for a deps list. We add a
transitive_deps property to each with the transitive closure of those
dependency lists. The result list is sorted in a topological ordering.
"""
lib_map = {lib['name']: lib for lib in dictionary.get('libs')}
for target_name, target_list in dictionary.items():
for target in target_list:
if isinstance(target, dict) and 'deps' in target:
target['transitive_deps'] = transitive_deps(lib_map, target)
python_dependencies = dictionary.get('python_dependencies')
python_dependencies['transitive_deps'] = transitive_deps(
lib_map, python_dependencies)
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