r"""Retrieves all the text between matching open and close parentheses. Given a string of lines and a regular expression string, retrieve all the text following the expression and between opening punctuation symbols like (, [, or {, and the matching close-punctuation symbol. This properly nes
(text, start_pattern)
| 4845 | |
| 4846 | |
| 4847 | def _GetTextInside(text, start_pattern): |
| 4848 | r"""Retrieves all the text between matching open and close parentheses. |
| 4849 | |
| 4850 | Given a string of lines and a regular expression string, retrieve all the text |
| 4851 | following the expression and between opening punctuation symbols like |
| 4852 | (, [, or {, and the matching close-punctuation symbol. This properly nested |
| 4853 | occurrences of the punctuations, so for the text like |
| 4854 | printf(a(), b(c())); |
| 4855 | a call to _GetTextInside(text, r'printf\(') will return 'a(), b(c())'. |
| 4856 | start_pattern must match string having an open punctuation symbol at the end. |
| 4857 | |
| 4858 | Args: |
| 4859 | text: The lines to extract text. Its comments and strings must be elided. |
| 4860 | It can be single line and can span multiple lines. |
| 4861 | start_pattern: The regexp string indicating where to start extracting |
| 4862 | the text. |
| 4863 | Returns: |
| 4864 | The extracted text. |
| 4865 | None if either the opening string or ending punctuation could not be found. |
| 4866 | """ |
| 4867 | # TODO(unknown): Audit cpplint.py to see what places could be profitably |
| 4868 | # rewritten to use _GetTextInside (and use inferior regexp matching today). |
| 4869 | |
| 4870 | # Give opening punctuations to get the matching close-punctuations. |
| 4871 | matching_punctuation = {'(': ')', '{': '}', '[': ']'} |
| 4872 | closing_punctuation = set(itervalues(matching_punctuation)) |
| 4873 | |
| 4874 | # Find the position to start extracting text. |
| 4875 | match = re.search(start_pattern, text, re.M) |
| 4876 | if not match: # start_pattern not found in text. |
| 4877 | return None |
| 4878 | start_position = match.end(0) |
| 4879 | |
| 4880 | assert start_position > 0, ( |
| 4881 | 'start_pattern must ends with an opening punctuation.') |
| 4882 | assert text[start_position - 1] in matching_punctuation, ( |
| 4883 | 'start_pattern must ends with an opening punctuation.') |
| 4884 | # Stack of closing punctuations we expect to have in text after position. |
| 4885 | punctuation_stack = [matching_punctuation[text[start_position - 1]]] |
| 4886 | position = start_position |
| 4887 | while punctuation_stack and position < len(text): |
| 4888 | if text[position] == punctuation_stack[-1]: |
| 4889 | punctuation_stack.pop() |
| 4890 | elif text[position] in closing_punctuation: |
| 4891 | # A closing punctuation without matching opening punctuations. |
| 4892 | return None |
| 4893 | elif text[position] in matching_punctuation: |
| 4894 | punctuation_stack.append(matching_punctuation[text[position]]) |
| 4895 | position += 1 |
| 4896 | if punctuation_stack: |
| 4897 | # Opening punctuations left without matching close-punctuations. |
| 4898 | return None |
| 4899 | # punctuations match. |
| 4900 | return text[start_position:position - 1] |
| 4901 | |
| 4902 | |
| 4903 | # Patterns for matching call-by-reference parameters. |
no test coverage detected