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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
from typing import List, Set
CONFIG_IS_NOT_SET_PATTERN = r'^# CONFIG_(\w+) is not set$'
CONFIG_PATTERN = r'^CONFIG_(\w+)=(\S+|".*")$'
KconfigEntryBase = collections.namedtuple('KconfigEntryBase', ['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) -> None:
self._entries = [] # type: List[KconfigEntry]
def entries(self) -> Set[KconfigEntry]:
return set(self._entries)
def add_entry(self, entry: KconfigEntry) -> None:
self._entries.append(entry)
def is_subset_of(self, other: 'Kconfig') -> bool:
other_dict = {e.name: e.value for e in other.entries()}
for a in self.entries():
b = other_dict.get(a.name)
if b is None:
if a.value == 'n':
continue
return False
elif a.value != b:
return False
return True
def merge_in_entries(self, other: 'Kconfig') -> None:
if other.is_subset_of(self):
return
self._entries = list(self.entries().union(other.entries()))
def write_to_file(self, path: str) -> None:
with open(path, 'a+') as f:
for entry in self.entries():
f.write(str(entry) + '\n')
def parse_file(path: str) -> Kconfig:
with open(path, 'r') as f:
return parse_from_string(f.read())
def parse_from_string(blob: str) -> Kconfig:
"""Parses a string containing Kconfig entries."""
kconfig = Kconfig()
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))
kconfig.add_entry(entry)
continue
empty_match = is_not_set_matcher.match(line)
if empty_match:
entry = KconfigEntry(empty_match.group(1), 'n')
kconfig.add_entry(entry)
continue
if line[0] == '#':
continue
else:
raise KconfigParseError('Failed to parse: ' + line)
return kconfig
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