Coverage for /pythoncovmergedfiles/medio/medio/usr/local/lib/python3.8/site-packages/pasta/base/fstring_utils.py: 69%

1# coding=utf-8 

2"""Helpers for working with fstrings (python3.6+).""" 

3# Copyright 2021 Google LLC 

4# 

5# Licensed under the Apache License, Version 2.0 (the "License"); 

6# you may not use this file except in compliance with the License. 

7# You may obtain a copy of the License at 

8# 

9# https://www.apache.org/licenses/LICENSE-2.0 

10# 

11# Unless required by applicable law or agreed to in writing, software 

12# distributed under the License is distributed on an "AS IS" BASIS, 

13# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 

14# See the License for the specific language governing permissions and 

15# limitations under the License. 

16 

17from __future__ import absolute_import 

18from __future__ import division 

19from __future__ import print_function 

20 

21import ast 

22 

23_FSTRING_VAL_PLACEHOLDER = '__pasta_fstring_val_{index}__' 

24 

25 

26def get_formatted_values(joined_str): 

27 """Get all FormattedValues from a JoinedStr, in order.""" 

28 return [v for v in joined_str.values if isinstance(v, ast.FormattedValue)] 

29 

30 

31def placeholder(val_index): 

32 """Get the placeholder token for a FormattedValue in an fstring.""" 

33 return _FSTRING_VAL_PLACEHOLDER.format(index=val_index) 

34 

35 

36def perform_replacements(fstr, values): 

37 """Replace placeholders in an fstring with subexpressions.""" 

38 for i, value in enumerate(values): 

39 fstr = fstr.replace(_wrap(placeholder(i)), _wrap(value)) 

40 return fstr 

41 

42 

43def _wrap(s): 

44 return '{%s}' % s