mirror of
https://github.com/opencv/opencv.git
synced 2024-12-12 23:49:36 +08:00
235 lines
8.0 KiB
Python
235 lines
8.0 KiB
Python
# -*- coding: utf-8 -*-
|
|
"""
|
|
markupsafe
|
|
~~~~~~~~~~
|
|
|
|
Implements a Markup string.
|
|
|
|
:copyright: (c) 2010 by Armin Ronacher.
|
|
:license: BSD, see LICENSE for more details.
|
|
"""
|
|
import re
|
|
from ._compat import text_type, string_types, int_types, \
|
|
unichr, PY2
|
|
|
|
|
|
__all__ = ['Markup', 'soft_unicode', 'escape', 'escape_silent']
|
|
|
|
|
|
_striptags_re = re.compile(r'(<!--.*?-->|<[^>]*>)')
|
|
_entity_re = re.compile(r'&([^;]+);')
|
|
|
|
|
|
class Markup(text_type):
|
|
r"""Marks a string as being safe for inclusion in HTML/XML output without
|
|
needing to be escaped. This implements the `__html__` interface a couple
|
|
of frameworks and web applications use. :class:`Markup` is a direct
|
|
subclass of `unicode` and provides all the methods of `unicode` just that
|
|
it escapes arguments passed and always returns `Markup`.
|
|
|
|
The `escape` function returns markup objects so that double escaping can't
|
|
happen.
|
|
|
|
The constructor of the :class:`Markup` class can be used for three
|
|
different things: When passed an unicode object it's assumed to be safe,
|
|
when passed an object with an HTML representation (has an `__html__`
|
|
method) that representation is used, otherwise the object passed is
|
|
converted into a unicode string and then assumed to be safe:
|
|
|
|
>>> Markup("Hello <em>World</em>!")
|
|
Markup(u'Hello <em>World</em>!')
|
|
>>> class Foo(object):
|
|
... def __html__(self):
|
|
... return '<a href="#">foo</a>'
|
|
...
|
|
>>> Markup(Foo())
|
|
Markup(u'<a href="#">foo</a>')
|
|
|
|
If you want object passed being always treated as unsafe you can use the
|
|
:meth:`escape` classmethod to create a :class:`Markup` object:
|
|
|
|
>>> Markup.escape("Hello <em>World</em>!")
|
|
Markup(u'Hello <em>World</em>!')
|
|
|
|
Operations on a markup string are markup aware which means that all
|
|
arguments are passed through the :func:`escape` function:
|
|
|
|
>>> em = Markup("<em>%s</em>")
|
|
>>> em % "foo & bar"
|
|
Markup(u'<em>foo & bar</em>')
|
|
>>> strong = Markup("<strong>%(text)s</strong>")
|
|
>>> strong % {'text': '<blink>hacker here</blink>'}
|
|
Markup(u'<strong><blink>hacker here</blink></strong>')
|
|
>>> Markup("<em>Hello</em> ") + "<foo>"
|
|
Markup(u'<em>Hello</em> <foo>')
|
|
"""
|
|
__slots__ = ()
|
|
|
|
def __new__(cls, base=u'', encoding=None, errors='strict'):
|
|
if hasattr(base, '__html__'):
|
|
base = base.__html__()
|
|
if encoding is None:
|
|
return text_type.__new__(cls, base)
|
|
return text_type.__new__(cls, base, encoding, errors)
|
|
|
|
def __html__(self):
|
|
return self
|
|
|
|
def __add__(self, other):
|
|
if isinstance(other, string_types) or hasattr(other, '__html__'):
|
|
return self.__class__(super(Markup, self).__add__(self.escape(other)))
|
|
return NotImplemented
|
|
|
|
def __radd__(self, other):
|
|
if hasattr(other, '__html__') or isinstance(other, string_types):
|
|
return self.escape(other).__add__(self)
|
|
return NotImplemented
|
|
|
|
def __mul__(self, num):
|
|
if isinstance(num, int_types):
|
|
return self.__class__(text_type.__mul__(self, num))
|
|
return NotImplemented
|
|
__rmul__ = __mul__
|
|
|
|
def __mod__(self, arg):
|
|
if isinstance(arg, tuple):
|
|
arg = tuple(_MarkupEscapeHelper(x, self.escape) for x in arg)
|
|
else:
|
|
arg = _MarkupEscapeHelper(arg, self.escape)
|
|
return self.__class__(text_type.__mod__(self, arg))
|
|
|
|
def __repr__(self):
|
|
return '%s(%s)' % (
|
|
self.__class__.__name__,
|
|
text_type.__repr__(self)
|
|
)
|
|
|
|
def join(self, seq):
|
|
return self.__class__(text_type.join(self, map(self.escape, seq)))
|
|
join.__doc__ = text_type.join.__doc__
|
|
|
|
def split(self, *args, **kwargs):
|
|
return list(map(self.__class__, text_type.split(self, *args, **kwargs)))
|
|
split.__doc__ = text_type.split.__doc__
|
|
|
|
def rsplit(self, *args, **kwargs):
|
|
return list(map(self.__class__, text_type.rsplit(self, *args, **kwargs)))
|
|
rsplit.__doc__ = text_type.rsplit.__doc__
|
|
|
|
def splitlines(self, *args, **kwargs):
|
|
return list(map(self.__class__, text_type.splitlines(self, *args, **kwargs)))
|
|
splitlines.__doc__ = text_type.splitlines.__doc__
|
|
|
|
def unescape(self):
|
|
r"""Unescape markup again into an text_type string. This also resolves
|
|
known HTML4 and XHTML entities:
|
|
|
|
>>> Markup("Main » <em>About</em>").unescape()
|
|
u'Main \xbb <em>About</em>'
|
|
"""
|
|
from _constants import HTML_ENTITIES
|
|
def handle_match(m):
|
|
name = m.group(1)
|
|
if name in HTML_ENTITIES:
|
|
return unichr(HTML_ENTITIES[name])
|
|
try:
|
|
if name[:2] in ('#x', '#X'):
|
|
return unichr(int(name[2:], 16))
|
|
elif name.startswith('#'):
|
|
return unichr(int(name[1:]))
|
|
except ValueError:
|
|
pass
|
|
return u''
|
|
return _entity_re.sub(handle_match, text_type(self))
|
|
|
|
def striptags(self):
|
|
r"""Unescape markup into an text_type string and strip all tags. This
|
|
also resolves known HTML4 and XHTML entities. Whitespace is
|
|
normalized to one:
|
|
|
|
>>> Markup("Main » <em>About</em>").striptags()
|
|
u'Main \xbb About'
|
|
"""
|
|
stripped = u' '.join(_striptags_re.sub('', self).split())
|
|
return Markup(stripped).unescape()
|
|
|
|
@classmethod
|
|
def escape(cls, s):
|
|
"""Escape the string. Works like :func:`escape` with the difference
|
|
that for subclasses of :class:`Markup` this function would return the
|
|
correct subclass.
|
|
"""
|
|
rv = escape(s)
|
|
if rv.__class__ is not cls:
|
|
return cls(rv)
|
|
return rv
|
|
|
|
def make_wrapper(name):
|
|
orig = getattr(text_type, name)
|
|
def func(self, *args, **kwargs):
|
|
args = _escape_argspec(list(args), enumerate(args), self.escape)
|
|
#_escape_argspec(kwargs, kwargs.iteritems(), None)
|
|
return self.__class__(orig(self, *args, **kwargs))
|
|
func.__name__ = orig.__name__
|
|
func.__doc__ = orig.__doc__
|
|
return func
|
|
|
|
for method in '__getitem__', 'capitalize', \
|
|
'title', 'lower', 'upper', 'replace', 'ljust', \
|
|
'rjust', 'lstrip', 'rstrip', 'center', 'strip', \
|
|
'translate', 'expandtabs', 'swapcase', 'zfill':
|
|
locals()[method] = make_wrapper(method)
|
|
|
|
# new in python 2.5
|
|
if hasattr(text_type, 'partition'):
|
|
def partition(self, sep):
|
|
return tuple(map(self.__class__,
|
|
text_type.partition(self, self.escape(sep))))
|
|
def rpartition(self, sep):
|
|
return tuple(map(self.__class__,
|
|
text_type.rpartition(self, self.escape(sep))))
|
|
|
|
# new in python 2.6
|
|
if hasattr(text_type, 'format'):
|
|
format = make_wrapper('format')
|
|
|
|
# not in python 3
|
|
if hasattr(text_type, '__getslice__'):
|
|
__getslice__ = make_wrapper('__getslice__')
|
|
|
|
del method, make_wrapper
|
|
|
|
|
|
def _escape_argspec(obj, iterable, escape):
|
|
"""Helper for various string-wrapped functions."""
|
|
for key, value in iterable:
|
|
if hasattr(value, '__html__') or isinstance(value, string_types):
|
|
obj[key] = escape(value)
|
|
return obj
|
|
|
|
|
|
class _MarkupEscapeHelper(object):
|
|
"""Helper for Markup.__mod__"""
|
|
|
|
def __init__(self, obj, escape):
|
|
self.obj = obj
|
|
self.escape = escape
|
|
|
|
__getitem__ = lambda s, x: _MarkupEscapeHelper(s.obj[x], s.escape)
|
|
__unicode__ = __str__ = lambda s: text_type(s.escape(s.obj))
|
|
__repr__ = lambda s: str(s.escape(repr(s.obj)))
|
|
__int__ = lambda s: int(s.obj)
|
|
__float__ = lambda s: float(s.obj)
|
|
|
|
|
|
# we have to import it down here as the speedups and native
|
|
# modules imports the markup type which is define above.
|
|
try:
|
|
from _speedups import escape, escape_silent, soft_unicode
|
|
except ImportError:
|
|
from ._native import escape, escape_silent, soft_unicode
|
|
|
|
if not PY2:
|
|
soft_str = soft_unicode
|
|
__all__.append('soft_str')
|