projects / config.git / blame
| Commit | Line | Data |
|---|---|---|
| 53e6db90 DC |
1 | import re |
| 2 | from codecs import BOM_UTF8 | |
| 3 | from typing import Tuple | |
| 4 | ||
| 5 | from parso.python.tokenize import group | |
| 6 | ||
| 7 | unicode_bom = BOM_UTF8.decode('utf-8') | |
| 8 | ||
| 9 | ||
| 10 | class PrefixPart: | |
| 11 | def __init__(self, leaf, typ, value, spacing='', start_pos=None): | |
| 12 | assert start_pos is not None | |
| 13 | self.parent = leaf | |
| 14 | self.type = typ | |
| 15 | self.value = value | |
| 16 | self.spacing = spacing | |
| 17 | self.start_pos: Tuple[int, int] = start_pos | |
| 18 | ||
| 19 | @property | |
| 20 | def end_pos(self) -> Tuple[int, int]: | |
| 21 | if self.value.endswith('\n') or self.value.endswith('\r'): | |
| 22 | return self.start_pos[0] + 1, 0 | |
| 23 | if self.value == unicode_bom: | |
| 24 | # The bom doesn't have a length at the start of a Python file. | |
| 25 | return self.start_pos | |
| 26 | return self.start_pos[0], self.start_pos[1] + len(self.value) | |
| 27 | ||
| 28 | def create_spacing_part(self): | |
| 29 | column = self.start_pos[1] - len(self.spacing) | |
| 30 | return PrefixPart( | |
| 31 | self.parent, 'spacing', self.spacing, | |
| 32 | start_pos=(self.start_pos[0], column) | |
| 33 | ) | |
| 34 | ||
| 35 | def __repr__(self): | |
| 36 | return '%s(%s, %s, %s)' % ( | |
| 37 | self.__class__.__name__, | |
| 38 | self.type, | |
| 39 | repr(self.value), | |
| 40 | self.start_pos | |
| 41 | ) | |
| 42 | ||
| 43 | def search_ancestor(self, *node_types): | |
| 44 | node = self.parent | |
| 45 | while node is not None: | |
| 46 | if node.type in node_types: | |
| 47 | return node | |
| 48 | node = node.parent | |
| 49 | return None | |
| 50 | ||
| 51 | ||
| 52 | _comment = r'#[^\n\r\f]*' | |
| 53 | _backslash = r'\\\r?\n|\\\r' | |
| 54 | _newline = r'\r?\n|\r' | |
| 55 | _form_feed = r'\f' | |
| 56 | _only_spacing = '$' | |
| 57 | _spacing = r'[ \t]*' | |
| 58 | _bom = unicode_bom | |
| 59 | ||
| 60 | _regex = group( | |
| 61 | _comment, _backslash, _newline, _form_feed, _only_spacing, _bom, | |
| 62 | capture=True | |
| 63 | ) | |
| 64 | _regex = re.compile(group(_spacing, capture=True) + _regex) | |
| 65 | ||
| 66 | ||
| 67 | _types = { | |
| 68 | '#': 'comment', | |
| 69 | '\\': 'backslash', | |
| 70 | '\f': 'formfeed', | |
| 71 | '\n': 'newline', | |
| 72 | '\r': 'newline', | |
| 73 | unicode_bom: 'bom' | |
| 74 | } | |
| 75 | ||
| 76 | ||
| 77 | def split_prefix(leaf, start_pos): | |
| 78 | line, column = start_pos | |
| 79 | start = 0 | |
| 80 | value = spacing = '' | |
| 81 | bom = False | |
| 82 | while start != len(leaf.prefix): | |
| 83 | match = _regex.match(leaf.prefix, start) | |
| 84 | spacing = match.group(1) | |
| 85 | value = match.group(2) | |
| 86 | if not value: | |
| 87 | break | |
| 88 | type_ = _types[value[0]] | |
| 89 | yield PrefixPart( | |
| 90 | leaf, type_, value, spacing, | |
| 91 | start_pos=(line, column + start - int(bom) + len(spacing)) | |
| 92 | ) | |
| 93 | if type_ == 'bom': | |
| 94 | bom = True | |
| 95 | ||
| 96 | start = match.end(0) | |
| 97 | if value.endswith('\n') or value.endswith('\r'): | |
| 98 | line += 1 | |
| 99 | column = -start | |
| 100 | ||
| 101 | if value: | |
| 102 | spacing = '' | |
| 103 | yield PrefixPart( | |
| 104 | leaf, 'spacing', spacing, | |
| 105 | start_pos=(line, column + start) | |
| 106 | ) |