# SPDX-License-Identifier: GPL-2.0## Builds a .config from a kunitconfig.## Copyright (C) 2019, Google LLC.# Author: Felix Guo <felixguoxiuping@gmail.com># Author: Brendan Higgins <brendanhiggins@google.com> import collectionsimport re CONFIG_IS_NOT_SET_PATTERN = r'^# CONFIG_(\w+) is not set$'CONFIG_PATTERN = r'^CONFIG_(\w+)=(\S+|".*")$' KconfigEntryBase = collections.namedtuple('KconfigEntry', ['name', 'value']) class KconfigEntry(KconfigEntryBase): 	def __str__(self) -> str:		if self.value == 'n':			return r'# CONFIG_%s is not set' % (self.name)		else:			return r'CONFIG_%s=%s' % (self.name, self.value)  class KconfigParseError(Exception):	"""Error parsing Kconfig defconfig or .config."""  class Kconfig(object):	"""Represents defconfig or .config specified using the Kconfig language.""" 	def __init__(self):		self._entries = [] 	def entries(self):		return set(self._entries) 	def add_entry(self, entry: KconfigEntry) -> None:		self._entries.append(entry) 	def is_subset_of(self, other: 'Kconfig') -> bool:		for a in self.entries():			found = False			for b in other.entries():				if a.name != b.name:					continue				if a.value != b.value:					return False				found = True			if a.value != 'n' and found == False:				return False		return True 	def write_to_file(self, path: str) -> None:		with open(path, 'w') as f:			for entry in self.entries():				f.write(str(entry) + '\n') 	def parse_from_string(self, blob: str) -> None:		"""Parses a string containing KconfigEntrys and populates this Kconfig."""		self._entries = []		is_not_set_matcher = re.compile(CONFIG_IS_NOT_SET_PATTERN)		config_matcher = re.compile(CONFIG_PATTERN)		for line in blob.split('\n'):			line = line.strip()			if not line:				continue 			match = config_matcher.match(line)			if match:				entry = KconfigEntry(match.group(1), match.group(2))				self.add_entry(entry)				continue 			empty_match = is_not_set_matcher.match(line)			if empty_match:				entry = KconfigEntry(empty_match.group(1), 'n')				self.add_entry(entry)				continue 			if line[0] == '#':				continue			else:				raise KconfigParseError('Failed to parse: ' + line) 	def read_from_file(self, path: str) -> None:		with open(path, 'r') as f:			self.parse_from_string(f.read())