1 # SPDX-License-Identifier: GPL-2.0
2 #
3 # Builds a .config from a kunitconfig.
4 #
5 # Copyright (C) 2019, Google LLC.
6 # Author: Felix Guo <felixguoxiuping@gmail.com>
7 # Author: Brendan Higgins <brendanhiggins@google.com>
8
9 from dataclasses import dataclass
10 import re
11 from typing import Any, Dict, Iterable, List, Tuple
12
13 CONFIG_IS_NOT_SET_PATTERN = r'^# CONFIG_(\w+) is not set$'
14 CONFIG_PATTERN = r'^CONFIG_(\w+)=(\S+|".*")$'
15
16 @dataclass(frozen=True)
17 class KconfigEntry:
18 name: str
19 value: str
20
21 def __str__(self) -> str:
22 if self.value == 'n':
23 return f'# CONFIG_{self.name} is not set'
24 return f'CONFIG_{self.name}={self.value}'
25
26
27 class KconfigParseError(Exception):
28 """Error parsing Kconfig defconfig or .config."""
29
30
31 class Kconfig:
32 """Represents defconfig or .config specified using the Kconfig language."""
33
34 def __init__(self) -> None:
35 self._entries = {} # type: Dict[str, str]
36
37 def __eq__(self, other: Any) -> bool:
38 if not isinstance(other, self.__class__):
39 return False
40 return self._entries == other._entries
41
42 def __repr__(self) -> str:
43 return ','.join(str(e) for e in self.as_entries())
44
45 def as_entries(self) -> Iterable[KconfigEntry]:
46 for name, value in self._entries.items():
47 yield KconfigEntry(name, value)
48
49 def add_entry(self, name: str, value: str) -> None:
50 self._entries[name] = value
51
52 def is_subset_of(self, other: 'Kconfig') -> bool:
53 for name, value in self._entries.items():
54 b = other._entries.get(name)
55 if b is None:
56 if value == 'n':
57 continue
58 return False
59 if value != b:
60 return False
61 return True
62
63 def conflicting_options(self, other: 'Kconfig') -> List[Tuple[KconfigEntry, KconfigEntry]]:
64 diff = [] # type: List[Tuple[KconfigEntry, KconfigEntry]]
65 for name, value in self._entries.items():
66 b = other._entries.get(name)
67 if b and value != b:
68 pair = (KconfigEntry(name, value), KconfigEntry(name, b))
69 diff.append(pair)
70 return diff
71
72 def merge_in_entries(self, other: 'Kconfig') -> None:
73 for name, value in other._entries.items():
74 self._entries[name] = value
75
76 def write_to_file(self, path: str) -> None:
77 with open(path, 'a+') as f:
78 for e in self.as_entries():
79 f.write(str(e) + '\n')
80
81 def parse_file(path: str) -> Kconfig:
82 with open(path, 'r') as f:
83 return parse_from_string(f.read())
84
85 def parse_from_string(blob: str) -> Kconfig:
86 """Parses a string containing Kconfig entries."""
87 kconfig = Kconfig()
88 is_not_set_matcher = re.compile(CONFIG_IS_NOT_SET_PATTERN)
89 config_matcher = re.compile(CONFIG_PATTERN)
90 for line in blob.split('\n'):
91 line = line.strip()
92 if not line:
93 continue
94
95 match = config_matcher.match(line)
96 if match:
97 kconfig.add_entry(match.group(1), match.group(2))
98 continue
99
100 empty_match = is_not_set_matcher.match(line)
101 if empty_match:
102 kconfig.add_entry(empty_match.group(1), 'n')
103 continue
104
105 if line[0] == '#':
106 continue
107 raise KconfigParseError('Failed to parse: ' + line)
108 return kconfig
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