/usr/lib/python3/dist-packages/importmagic/importer.py is in python3-importmagic 0.1.7-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 | """Imports new symbols."""
import tokenize
from collections import defaultdict
from six import StringIO
class Iterator(object):
def __init__(self, tokens, start=None, end=None):
self._tokens = tokens
self._cursor = start or 0
self._end = end or len(self._tokens)
def rewind(self):
self._cursor -= 1
def next(self):
if not self:
return None, None
token = self._tokens[self._cursor]
index = self._cursor
self._cursor += 1
return index, token
def peek(self):
return self._tokens[self._cursor] if self else None
def until(self, type):
tokens = []
while self:
index, token = self.next()
tokens.append((index, token))
if type == token[0]:
break
return tokens
def __nonzero__(self):
return self._cursor < self._end
__bool__ = __nonzero__
class Import(object):
def __init__(self, location, name, alias):
self.location = location
self.name = name
self.alias = alias
def __repr__(self):
return 'Import(location=%r, name=%r, alias=%r)' % \
(self.location, self.name, self.alias)
def __hash__(self):
return hash((self.location, self.name, self.alias))
def __eq__(self, other):
return self.location == other.location and self.name == other.name and self.alias == other.alias
def __ne__(self, other):
return not (self == other)
def __lt__(self, other):
return self.location < other.location \
or self.name < other.name \
or (self.alias is not None and other.alias is not None and self.alias < other.alias)
# See SymbolIndex.LOCATIONS for details.
LOCATION_ORDER = 'FS3L'
class Imports(object):
_style = {'multiline': 'parentheses',
'max_columns': 80,
}
def __init__(self, index, source):
self._imports = set()
self._imports_from = defaultdict(set)
self._imports_begin = self._imports_end = None
self._source = source
self._index = index
self._parse(source)
@classmethod
def set_style(cls, **kwargs):
cls._style.update(kwargs)
def add_import(self, name, alias=None):
location = LOCATION_ORDER.index(self._index.location_for(name))
self._imports.add(Import(location, name, alias))
def add_import_from(self, module, name, alias=None):
location = LOCATION_ORDER.index(self._index.location_for(module))
self._imports_from[module].add(Import(location, name, alias))
def remove(self, references):
for imp in list(self._imports):
if imp.name in references:
self._imports.remove(imp)
for name, imports in self._imports_from.items():
for imp in list(imports):
if imp.name in references:
imports.remove(imp)
def get_update(self):
groups = []
for expected_location in range(len(LOCATION_ORDER)):
out = StringIO()
for imp in sorted(self._imports):
if expected_location != imp.location:
continue
out.write('import {module}{alias}\n'.format(
module=imp.name,
alias=' as {alias}'.format(alias=imp.alias) if imp.alias else '',
))
for module, imports in sorted(self._imports_from.items()):
imports = sorted(imports)
if not imports or expected_location != imports[0].location:
continue
line = 'from {module} import '.format(module=module)
clauses = ['{name}{alias}'.format(
name=i.name,
alias=' as {alias}'.format(alias=i.alias) if i.alias else ''
) for i in imports]
clauses.reverse()
line_len = len(line)
line_pieces = []
paren_used = False
while clauses:
clause = clauses.pop()
next_len = line_len + len(clause) + 2
if next_len > self._style['max_columns']:
imported_items = ', '.join(line_pieces)
if self._style['multiline'] == 'parentheses':
line_tail = ',\n'
if not paren_used:
line += '('
paren_used = True
line_pieces.append('\n')
else:
# Use a backslash
line_tail = ', \\\n'
out.write(line + imported_items + line_tail)
line = ' '
line_len = len(line) + len(clause) + 2
line_pieces = [clause]
else:
line_pieces.append(clause)
line_len = next_len
line += ', '.join(line_pieces) + (')\n' if paren_used else '\n')
if line.strip():
out.write(line)
text = out.getvalue()
if text:
groups.append(text)
start = self._tokens[self._imports_begin][2][0] - 1
end = self._tokens[min(len(self._tokens) - 1, self._imports_end)][2][0] - 1
if groups:
text = '\n'.join(groups) + '\n\n'
else:
text = ''
return start, end, text
def update_source(self):
start, end, text = self.get_update()
lines = self._source.splitlines()
lines[start:end] = text.splitlines()
return '\n'.join(lines) + '\n'
def _parse(self, source):
reader = StringIO(source)
# parse until EOF or TokenError (allows incomplete modules)
tokens = []
try:
tokens.extend(tokenize.generate_tokens(reader.readline))
except tokenize.TokenError:
# TokenError happens always at EOF, for unclosed strings or brackets.
# We don't care about that here, since we still can recover the whole
# source code.
pass
self._tokens = tokens
it = Iterator(self._tokens)
self._imports_begin, self._imports_end = self._find_import_range(it)
it = Iterator(self._tokens, start=self._imports_begin, end=self._imports_end)
self._parse_imports(it)
def _find_import_range(self, it):
ranges = self._find_import_ranges(it)
start, end = ranges[0][1:]
return start, end
def _find_import_ranges(self, it):
ranges = []
indentation = 0
explicit = False
size = 0
start = None
potential_end_index = -1
while it:
index, token = it.next()
if token[0] == tokenize.INDENT:
indentation += 1
continue
elif token[0] == tokenize.DEDENT:
indentation += 1
continue
if indentation:
continue
# Explicitly tell importmagic to manage the following block of imports
if token[1] == '# importmagic: manage':
ranges = []
start = index + 2 # Start managing imports after directive comment + newline.
explicit = True
continue
elif token[0] in (tokenize.STRING, tokenize.COMMENT):
# If a non-import statement follows, stop the range *before*
# this string or comment, in order to keep it out of the
# updated import block.
if potential_end_index == -1:
potential_end_index = index
continue
elif token[0] in (tokenize.NEWLINE, tokenize.NL):
continue
if not ranges:
ranges.append((0, index, index))
# Accumulate imports
if token[1] in ('import', 'from'):
potential_end_index = -1
if start is None:
start = index
size += 1
while it:
token = it.peek()
if token[0] == tokenize.NEWLINE or token[1] == ';':
break
index, _ = it.next()
# Terminate this import range
elif start is not None and token[1].strip():
if potential_end_index > -1:
index = potential_end_index
potential_end_index = -1
ranges.append((size, start, index))
start = None
size = 0
if explicit:
break
if start is not None:
ranges.append((size, start, index))
ranges.sort(reverse=True)
return ranges
def _parse_imports(self, it):
while it:
index, token = it.next()
if token[1] not in ('import', 'from') and token[1].strip():
continue
type = token[1]
if type in ('import', 'from'):
tokens = it.until(tokenize.NEWLINE)
tokens = [t[1] for i, t in tokens
if t[0] == tokenize.NAME or t[1] in ',.']
tokens.reverse()
self._parse_import(type, tokens)
def _parse_import(self, type, tokens):
module = None
if type == 'from':
module = ''
while tokens and tokens[-1] != 'import':
module += tokens.pop()
assert tokens.pop() == 'import'
while tokens:
name = ''
while True:
name += tokens.pop()
next = tokens.pop() if tokens else None
if next == '.':
name += next
else:
break
alias = None
if next == 'as':
alias = tokens.pop()
if alias == name:
alias = None
next = tokens.pop() if tokens else None
if next == ',':
pass
if type == 'import':
self.add_import(name, alias=alias)
else:
self.add_import_from(module, name, alias=alias)
def __repr__(self):
return 'Imports(imports=%r, imports_from=%r)' % (self._imports, self._imports_from)
def _process_imports(src, index, unresolved, unreferenced):
imports = Imports(index, src)
imports.remove(unreferenced)
for symbol in unresolved:
scores = index.symbol_scores(symbol)
if not scores:
continue
_, module, variable = scores[0]
# Direct module import: eg. os.path
if variable is None:
# sys.path sys path -> import sys
# os.path.basename os.path basename -> import os.path
imports.add_import(module)
else:
# basename os.path basename -> from os.path import basename
# path.basename os.path basename -> from os import path
imports.add_import_from(module, variable)
return imports
def get_update(src, index, unresolved, unreferenced):
imports = _process_imports(src, index, unresolved, unreferenced)
return imports.get_update()
def update_imports(src, index, unresolved, unreferenced):
imports = _process_imports(src, index, unresolved, unreferenced)
return imports.update_source()
|