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# 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 collections
import 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())
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