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# Copyright 2023 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.
# parse.py is a long-living program that communicates over STDIN and STDOUT.
# STDIN receives parse requests, one per line. It outputs the parsed modules and
# comments from all the files from each request.
import ast
import concurrent.futures
import json
import os
import sys
from io import BytesIO
from tokenize import COMMENT, tokenize
def parse_import_statements(content, filepath):
modules = list()
tree = ast.parse(content, filename=filepath)
for node in ast.walk(tree):
if isinstance(node, ast.Import):
for subnode in node.names:
module = {
"name": subnode.name,
"lineno": node.lineno,
"filepath": filepath,
"from": "",
}
modules.append(module)
elif isinstance(node, ast.ImportFrom) and node.level == 0:
for subnode in node.names:
module = {
"name": f"{node.module}.{subnode.name}",
"lineno": node.lineno,
"filepath": filepath,
"from": node.module,
}
modules.append(module)
return modules
def parse_comments(content):
comments = list()
g = tokenize(BytesIO(content.encode("utf-8")).readline)
for toknum, tokval, _, _, _ in g:
if toknum == COMMENT:
comments.append(tokval)
return comments
def parse(repo_root, rel_package_path, filename):
rel_filepath = os.path.join(rel_package_path, filename)
abs_filepath = os.path.join(repo_root, rel_filepath)
with open(abs_filepath, "r") as file:
content = file.read()
# From simple benchmarks, 2 workers gave the best performance here.
with concurrent.futures.ThreadPoolExecutor(max_workers=2) as executor:
modules_future = executor.submit(
parse_import_statements, content, rel_filepath
)
comments_future = executor.submit(parse_comments, content)
modules = modules_future.result()
comments = comments_future.result()
output = {
"modules": modules,
"comments": comments,
}
return output
def main(stdin, stdout):
with concurrent.futures.ProcessPoolExecutor() as executor:
for parse_request in stdin:
parse_request = json.loads(parse_request)
repo_root = parse_request["repo_root"]
rel_package_path = parse_request["rel_package_path"]
filenames = parse_request["filenames"]
outputs = list()
if len(filenames) == 1:
outputs.append(parse(repo_root, rel_package_path, filenames[0]))
else:
futures = [
executor.submit(parse, repo_root, rel_package_path, filename)
for filename in filenames
if filename != ""
]
for future in concurrent.futures.as_completed(futures):
outputs.append(future.result())
print(json.dumps(outputs), end="", file=stdout, flush=True)
stdout.buffer.write(bytes([0]))
stdout.flush()
if __name__ == "__main__":
exit(main(sys.stdin, sys.stdout))
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