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# Copyright 2024 The etils Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Re utils."""
import functools
import re
def reverse_fstring(pattern: str, string: str) -> dict[str, str] | None:
"""Reverse f-string.
Example:
```python
epy.reverse_fstring(
'/home/{user}/projects/{project}',
'/home/conchylicultor/projects/menhir'
) == {
'user': 'conchylicultor',
'project': 'menhir',
}
```
Args:
pattern: The f-string pattern (can only contained named group)
string: The string to search
Returns:
The extracted info
"""
pattern = _pattern_cache(pattern)
if m := pattern.fullmatch(string):
return m.groupdict()
else:
return None
@functools.cache
def _pattern_cache(pattern: str) -> re.Pattern[str]:
pattern = re.sub(r'\{(?P<name>\w+)\}', r'(?P<\g<name>>.+)', pattern)
return re.compile(pattern)
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