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