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#!/usr/bin/env python
# Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
#
# Use of this source code is governed by a BSD-style license
# that can be found in the LICENSE file in the root of the source
# tree. An additional intellectual property rights grant can be found
# in the file PATENTS. All contributing project authors may
# be found in the AUTHORS file in the root of the source tree.
import os
import re
import string
# TARGET_RE matches a GN target, and extracts the target name and the contents.
TARGET_RE = re.compile(r'(?P<indent>\s*)\w+\("(?P<target_name>\w+)"\) {'
r'(?P<target_contents>.*?)'
r'(?P=indent)}',
re.MULTILINE | re.DOTALL)
# SOURCES_RE matches a block of sources inside a GN target.
SOURCES_RE = re.compile(
r'(sources|public|common_objc_headers) \+?= \[(?P<sources>.*?)\]',
re.MULTILINE | re.DOTALL)
SOURCE_FILE_RE = re.compile(r'.*\"(?P<source_file>.*)\"')
class NoBuildGnFoundError(Exception):
pass
class WrongFileTypeError(Exception):
pass
def _ReadFile(file_path):
"""Returns the content of file_path in a string.
Args:
file_path: the path of the file to read.
Returns:
A string with the content of the file.
"""
with open(file_path) as f:
return f.read()
def GetBuildGnPathFromFilePath(file_path, file_exists_check, root_dir_path):
"""Returns the BUILD.gn file responsible for file_path.
Args:
file_path: the absolute path to the .h file to check.
file_exists_check: a function that defines how to check if a file exists
on the file system.
root_dir_path: the absolute path of the root of project.
Returns:
A string with the absolute path to the BUILD.gn file responsible to include
file_path in a target.
"""
if not file_path.endswith('.h'):
raise WrongFileTypeError(
'File {} is not an header file (.h)'.format(file_path))
candidate_dir = os.path.dirname(file_path)
while candidate_dir.startswith(root_dir_path):
candidate_build_gn_path = os.path.join(candidate_dir, 'BUILD.gn')
if file_exists_check(candidate_build_gn_path):
return candidate_build_gn_path
else:
candidate_dir = os.path.abspath(os.path.join(candidate_dir,
os.pardir))
raise NoBuildGnFoundError(
'No BUILD.gn file found for file: `{}`'.format(file_path))
def IsHeaderInBuildGn(header_path, build_gn_path):
"""Returns True if the header is listed in the BUILD.gn file.
Args:
header_path: the absolute path to the header to check.
build_gn_path: the absolute path to the header to check.
Returns:
bool: True if the header_path is an header that is listed in
at least one GN target in the BUILD.gn file specified by
the argument build_gn_path.
"""
target_abs_path = os.path.dirname(build_gn_path)
build_gn_content = _ReadFile(build_gn_path)
headers_in_build_gn = GetHeadersInBuildGnFileSources(build_gn_content,
target_abs_path)
return header_path in headers_in_build_gn
def GetHeadersInBuildGnFileSources(file_content, target_abs_path):
"""Returns a set with all the .h files in the file_content.
Args:
file_content: a string with the content of the BUILD.gn file.
target_abs_path: the absolute path to the directory where the
BUILD.gn file lives.
Returns:
A set with all the headers (.h file) in the file_content.
The set contains absolute paths.
"""
headers_in_sources = set([])
for target_match in TARGET_RE.finditer(file_content):
target_contents = target_match.group('target_contents')
for sources_match in SOURCES_RE.finditer(target_contents):
sources = sources_match.group('sources')
for source_file_match in SOURCE_FILE_RE.finditer(sources):
source_file = source_file_match.group('source_file')
if source_file.endswith('.h'):
source_file_tokens = string.split(source_file, '/')
headers_in_sources.add(os.path.join(target_abs_path,
*source_file_tokens))
return headers_in_sources
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