107 lines
2.7 KiB
Python
107 lines
2.7 KiB
Python
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import re
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from codecs import BOM_UTF8
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from typing import Tuple
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from parso.python.tokenize import group
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unicode_bom = BOM_UTF8.decode('utf-8')
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class PrefixPart:
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def __init__(self, leaf, typ, value, spacing='', start_pos=None):
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assert start_pos is not None
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self.parent = leaf
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self.type = typ
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self.value = value
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self.spacing = spacing
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self.start_pos: Tuple[int, int] = start_pos
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@property
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def end_pos(self) -> Tuple[int, int]:
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if self.value.endswith('\n') or self.value.endswith('\r'):
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return self.start_pos[0] + 1, 0
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if self.value == unicode_bom:
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# The bom doesn't have a length at the start of a Python file.
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return self.start_pos
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return self.start_pos[0], self.start_pos[1] + len(self.value)
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def create_spacing_part(self):
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column = self.start_pos[1] - len(self.spacing)
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return PrefixPart(
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self.parent, 'spacing', self.spacing,
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start_pos=(self.start_pos[0], column)
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)
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def __repr__(self):
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return '%s(%s, %s, %s)' % (
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self.__class__.__name__,
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self.type,
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repr(self.value),
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self.start_pos
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)
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def search_ancestor(self, *node_types):
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node = self.parent
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while node is not None:
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if node.type in node_types:
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return node
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node = node.parent
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return None
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_comment = r'#[^\n\r\f]*'
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_backslash = r'\\\r?\n|\\\r'
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_newline = r'\r?\n|\r'
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_form_feed = r'\f'
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_only_spacing = '$'
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_spacing = r'[ \t]*'
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_bom = unicode_bom
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_regex = group(
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_comment, _backslash, _newline, _form_feed, _only_spacing, _bom,
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capture=True
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)
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_regex = re.compile(group(_spacing, capture=True) + _regex)
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_types = {
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'#': 'comment',
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'\\': 'backslash',
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'\f': 'formfeed',
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'\n': 'newline',
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'\r': 'newline',
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unicode_bom: 'bom'
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}
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def split_prefix(leaf, start_pos):
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line, column = start_pos
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start = 0
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value = spacing = ''
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bom = False
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while start != len(leaf.prefix):
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match = _regex.match(leaf.prefix, start)
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spacing = match.group(1)
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value = match.group(2)
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if not value:
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break
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type_ = _types[value[0]]
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yield PrefixPart(
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leaf, type_, value, spacing,
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start_pos=(line, column + start - int(bom) + len(spacing))
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)
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if type_ == 'bom':
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bom = True
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start = match.end(0)
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if value.endswith('\n') or value.endswith('\r'):
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line += 1
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column = -start
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if value:
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spacing = ''
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yield PrefixPart(
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leaf, 'spacing', spacing,
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start_pos=(line, column + start)
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)
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