Coverage for /pythoncovmergedfiles/medio/medio/usr/local/lib/python3.8/site-packages/markupsafe/__init__.py: 52%

1import functools 

2import string 

3import sys 

4import typing as t 

5 

6if t.TYPE_CHECKING: 

7 import typing_extensions as te 

8 

9 class HasHTML(te.Protocol): 

10 def __html__(self) -> str: 

11 pass 

12 

13 _P = te.ParamSpec("_P") 

14 

15 

16__version__ = "2.1.5" 

17 

18 

19def _simple_escaping_wrapper(func: "t.Callable[_P, str]") -> "t.Callable[_P, Markup]": 

20 @functools.wraps(func) 

21 def wrapped(self: "Markup", *args: "_P.args", **kwargs: "_P.kwargs") -> "Markup": 

22 arg_list = _escape_argspec(list(args), enumerate(args), self.escape) 

23 _escape_argspec(kwargs, kwargs.items(), self.escape) 

24 return self.__class__(func(self, *arg_list, **kwargs)) # type: ignore[arg-type] 

25 

26 return wrapped # type: ignore[return-value] 

27 

28 

29class Markup(str): 

30 """A string that is ready to be safely inserted into an HTML or XML 

31 document, either because it was escaped or because it was marked 

32 safe. 

33 

34 Passing an object to the constructor converts it to text and wraps 

35 it to mark it safe without escaping. To escape the text, use the 

36 :meth:`escape` class method instead. 

37 

38 >>> Markup("Hello, <em>World</em>!") 

39 Markup('Hello, <em>World</em>!') 

40 >>> Markup(42) 

41 Markup('42') 

42 >>> Markup.escape("Hello, <em>World</em>!") 

43 Markup('Hello &lt;em&gt;World&lt;/em&gt;!') 

44 

45 This implements the ``__html__()`` interface that some frameworks 

46 use. Passing an object that implements ``__html__()`` will wrap the 

47 output of that method, marking it safe. 

48 

49 >>> class Foo: 

50 ... def __html__(self): 

51 ... return '<a href="/foo">foo</a>' 

52 ... 

53 >>> Markup(Foo()) 

54 Markup('<a href="/foo">foo</a>') 

55 

56 This is a subclass of :class:`str`. It has the same methods, but 

57 escapes their arguments and returns a ``Markup`` instance. 

58 

59 >>> Markup("<em>%s</em>") % ("foo & bar",) 

60 Markup('<em>foo &amp; bar</em>') 

61 >>> Markup("<em>Hello</em> ") + "<foo>" 

62 Markup('<em>Hello</em> &lt;foo&gt;') 

63 """ 

64 

65 __slots__ = () 

66 

67 def __new__( 

68 cls, base: t.Any = "", encoding: t.Optional[str] = None, errors: str = "strict" 

69 ) -> "te.Self": 

70 if hasattr(base, "__html__"): 

71 base = base.__html__() 

72 

73 if encoding is None: 

74 return super().__new__(cls, base) 

75 

76 return super().__new__(cls, base, encoding, errors) 

77 

78 def __html__(self) -> "te.Self": 

79 return self 

80 

81 def __add__(self, other: t.Union[str, "HasHTML"]) -> "te.Self": 

82 if isinstance(other, str) or hasattr(other, "__html__"): 

83 return self.__class__(super().__add__(self.escape(other))) 

84 

85 return NotImplemented 

86 

87 def __radd__(self, other: t.Union[str, "HasHTML"]) -> "te.Self": 

88 if isinstance(other, str) or hasattr(other, "__html__"): 

89 return self.escape(other).__add__(self) 

90 

91 return NotImplemented 

92 

93 def __mul__(self, num: "te.SupportsIndex") -> "te.Self": 

94 if isinstance(num, int): 

95 return self.__class__(super().__mul__(num)) 

96 

97 return NotImplemented 

98 

99 __rmul__ = __mul__ 

100 

101 def __mod__(self, arg: t.Any) -> "te.Self": 

102 if isinstance(arg, tuple): 

103 # a tuple of arguments, each wrapped 

104 arg = tuple(_MarkupEscapeHelper(x, self.escape) for x in arg) 

105 elif hasattr(type(arg), "__getitem__") and not isinstance(arg, str): 

106 # a mapping of arguments, wrapped 

107 arg = _MarkupEscapeHelper(arg, self.escape) 

108 else: 

109 # a single argument, wrapped with the helper and a tuple 

110 arg = (_MarkupEscapeHelper(arg, self.escape),) 

111 

112 return self.__class__(super().__mod__(arg)) 

113 

114 def __repr__(self) -> str: 

115 return f"{self.__class__.__name__}({super().__repr__()})" 

116 

117 def join(self, seq: t.Iterable[t.Union[str, "HasHTML"]]) -> "te.Self": 

118 return self.__class__(super().join(map(self.escape, seq))) 

119 

120 join.__doc__ = str.join.__doc__ 

121 

122 def split( # type: ignore[override] 

123 self, sep: t.Optional[str] = None, maxsplit: int = -1 

124 ) -> t.List["te.Self"]: 

125 return [self.__class__(v) for v in super().split(sep, maxsplit)] 

126 

127 split.__doc__ = str.split.__doc__ 

128 

129 def rsplit( # type: ignore[override] 

130 self, sep: t.Optional[str] = None, maxsplit: int = -1 

131 ) -> t.List["te.Self"]: 

132 return [self.__class__(v) for v in super().rsplit(sep, maxsplit)] 

133 

134 rsplit.__doc__ = str.rsplit.__doc__ 

135 

136 def splitlines( # type: ignore[override] 

137 self, keepends: bool = False 

138 ) -> t.List["te.Self"]: 

139 return [self.__class__(v) for v in super().splitlines(keepends)] 

140 

141 splitlines.__doc__ = str.splitlines.__doc__ 

142 

143 def unescape(self) -> str: 

144 """Convert escaped markup back into a text string. This replaces 

145 HTML entities with the characters they represent. 

146 

147 >>> Markup("Main &raquo; <em>About</em>").unescape() 

148 'Main » <em>About</em>' 

149 """ 

150 from html import unescape 

151 

152 return unescape(str(self)) 

153 

154 def striptags(self) -> str: 

155 """:meth:`unescape` the markup, remove tags, and normalize 

156 whitespace to single spaces. 

157 

158 >>> Markup("Main &raquo;\t<em>About</em>").striptags() 

159 'Main » About' 

160 """ 

161 value = str(self) 

162 

163 # Look for comments then tags separately. Otherwise, a comment that 

164 # contains a tag would end early, leaving some of the comment behind. 

165 

166 while True: 

167 # keep finding comment start marks 

168 start = value.find("<!--") 

169 

170 if start == -1: 

171 break 

172 

173 # find a comment end mark beyond the start, otherwise stop 

174 end = value.find("-->", start) 

175 

176 if end == -1: 

177 break 

178 

179 value = f"{value[:start]}{value[end + 3:]}" 

180 

181 # remove tags using the same method 

182 while True: 

183 start = value.find("<") 

184 

185 if start == -1: 

186 break 

187 

188 end = value.find(">", start) 

189 

190 if end == -1: 

191 break 

192 

193 value = f"{value[:start]}{value[end + 1:]}" 

194 

195 # collapse spaces 

196 value = " ".join(value.split()) 

197 return self.__class__(value).unescape() 

198 

199 @classmethod 

200 def escape(cls, s: t.Any) -> "te.Self": 

201 """Escape a string. Calls :func:`escape` and ensures that for 

202 subclasses the correct type is returned. 

203 """ 

204 rv = escape(s) 

205 

206 if rv.__class__ is not cls: 

207 return cls(rv) 

208 

209 return rv # type: ignore[return-value] 

210 

211 __getitem__ = _simple_escaping_wrapper(str.__getitem__) 

212 capitalize = _simple_escaping_wrapper(str.capitalize) 

213 title = _simple_escaping_wrapper(str.title) 

214 lower = _simple_escaping_wrapper(str.lower) 

215 upper = _simple_escaping_wrapper(str.upper) 

216 replace = _simple_escaping_wrapper(str.replace) 

217 ljust = _simple_escaping_wrapper(str.ljust) 

218 rjust = _simple_escaping_wrapper(str.rjust) 

219 lstrip = _simple_escaping_wrapper(str.lstrip) 

220 rstrip = _simple_escaping_wrapper(str.rstrip) 

221 center = _simple_escaping_wrapper(str.center) 

222 strip = _simple_escaping_wrapper(str.strip) 

223 translate = _simple_escaping_wrapper(str.translate) 

224 expandtabs = _simple_escaping_wrapper(str.expandtabs) 

225 swapcase = _simple_escaping_wrapper(str.swapcase) 

226 zfill = _simple_escaping_wrapper(str.zfill) 

227 casefold = _simple_escaping_wrapper(str.casefold) 

228 

229 if sys.version_info >= (3, 9): 

230 removeprefix = _simple_escaping_wrapper(str.removeprefix) 

231 removesuffix = _simple_escaping_wrapper(str.removesuffix) 

232 

233 def partition(self, sep: str) -> t.Tuple["te.Self", "te.Self", "te.Self"]: 

234 l, s, r = super().partition(self.escape(sep)) 

235 cls = self.__class__ 

236 return cls(l), cls(s), cls(r) 

237 

238 def rpartition(self, sep: str) -> t.Tuple["te.Self", "te.Self", "te.Self"]: 

239 l, s, r = super().rpartition(self.escape(sep)) 

240 cls = self.__class__ 

241 return cls(l), cls(s), cls(r) 

242 

243 def format(self, *args: t.Any, **kwargs: t.Any) -> "te.Self": 

244 formatter = EscapeFormatter(self.escape) 

245 return self.__class__(formatter.vformat(self, args, kwargs)) 

246 

247 def format_map( # type: ignore[override] 

248 self, map: t.Mapping[str, t.Any] 

249 ) -> "te.Self": 

250 formatter = EscapeFormatter(self.escape) 

251 return self.__class__(formatter.vformat(self, (), map)) 

252 

253 def __html_format__(self, format_spec: str) -> "te.Self": 

254 if format_spec: 

255 raise ValueError("Unsupported format specification for Markup.") 

256 

257 return self 

258 

259 

260class EscapeFormatter(string.Formatter): 

261 __slots__ = ("escape",) 

262 

263 def __init__(self, escape: t.Callable[[t.Any], Markup]) -> None: 

264 self.escape = escape 

265 super().__init__() 

266 

267 def format_field(self, value: t.Any, format_spec: str) -> str: 

268 if hasattr(value, "__html_format__"): 

269 rv = value.__html_format__(format_spec) 

270 elif hasattr(value, "__html__"): 

271 if format_spec: 

272 raise ValueError( 

273 f"Format specifier {format_spec} given, but {type(value)} does not" 

274 " define __html_format__. A class that defines __html__ must define" 

275 " __html_format__ to work with format specifiers." 

276 ) 

277 rv = value.__html__() 

278 else: 

279 # We need to make sure the format spec is str here as 

280 # otherwise the wrong callback methods are invoked. 

281 rv = string.Formatter.format_field(self, value, str(format_spec)) 

282 return str(self.escape(rv)) 

283 

284 

285_ListOrDict = t.TypeVar("_ListOrDict", list, dict) 

286 

287 

288def _escape_argspec( 

289 obj: _ListOrDict, iterable: t.Iterable[t.Any], escape: t.Callable[[t.Any], Markup] 

290) -> _ListOrDict: 

291 """Helper for various string-wrapped functions.""" 

292 for key, value in iterable: 

293 if isinstance(value, str) or hasattr(value, "__html__"): 

294 obj[key] = escape(value) 

295 

296 return obj 

297 

298 

299class _MarkupEscapeHelper: 

300 """Helper for :meth:`Markup.__mod__`.""" 

301 

302 __slots__ = ("obj", "escape") 

303 

304 def __init__(self, obj: t.Any, escape: t.Callable[[t.Any], Markup]) -> None: 

305 self.obj = obj 

306 self.escape = escape 

307 

308 def __getitem__(self, item: t.Any) -> "te.Self": 

309 return self.__class__(self.obj[item], self.escape) 

310 

311 def __str__(self) -> str: 

312 return str(self.escape(self.obj)) 

313 

314 def __repr__(self) -> str: 

315 return str(self.escape(repr(self.obj))) 

316 

317 def __int__(self) -> int: 

318 return int(self.obj) 

319 

320 def __float__(self) -> float: 

321 return float(self.obj) 

322 

323 

324# circular import 

325try: 

326 from ._speedups import escape as escape 

327 from ._speedups import escape_silent as escape_silent 

328 from ._speedups import soft_str as soft_str 

329except ImportError: 

330 from ._native import escape as escape 

331 from ._native import escape_silent as escape_silent # noqa: F401 

332 from ._native import soft_str as soft_str # noqa: F401