Skip to content
This repository
Fetching contributors…

Octocat-spinner-32-eaf2f5

Cannot retrieve contributors at this time

file 785 lines (655 sloc) 25.036 kb
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784
# -*- coding: utf-8 -*-
"""
jinja2.utils
~~~~~~~~~~~~

Utility functions.

:copyright: (c) 2009 by the Jinja Team.
:license: BSD, see LICENSE for more details.
"""
import re
import sys
import errno
try:
    from thread import allocate_lock
except ImportError:
    from dummy_thread import allocate_lock
from collections import deque
from itertools import imap


_word_split_re = re.compile(r'(\s+)')
_punctuation_re = re.compile(
    '^(?P<lead>(?:%s)*)(?P<middle>.*?)(?P<trail>(?:%s)*)$' % (
        '|'.join(imap(re.escape, ('(', '<', '&lt;'))),
        '|'.join(imap(re.escape, ('.', ',', ')', '>', '\n', '&gt;')))
    )
)
_simple_email_re = re.compile(r'^\S+@[a-zA-Z0-9._-]+\.[a-zA-Z0-9._-]+$')
_striptags_re = re.compile(r'(<!--.*?-->|<[^>]*>)')
_entity_re = re.compile(r'&([^;]+);')
_letters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
_digits = '0123456789'

# special singleton representing missing values for the runtime
missing = type('MissingType', (), {'__repr__': lambda x: 'missing'})()

# internal code
internal_code = set()


# concatenate a list of strings and convert them to unicode.
# unfortunately there is a bug in python 2.4 and lower that causes
# unicode.join trash the traceback.
_concat = u''.join
try:
    def _test_gen_bug():
        raise TypeError(_test_gen_bug)
        yield None
    _concat(_test_gen_bug())
except TypeError, _error:
    if not _error.args or _error.args[0] is not _test_gen_bug:
        def concat(gen):
            try:
                return _concat(list(gen))
            except:
                # this hack is needed so that the current frame
                # does not show up in the traceback.
                exc_type, exc_value, tb = sys.exc_info()
                raise exc_type, exc_value, tb.tb_next
    else:
        concat = _concat
    del _test_gen_bug, _error


# for python 2.x we create outselves a next() function that does the
# basics without exception catching.
try:
    next = next
except NameError:
    def next(x):
        return x.next()


# ironpython without stdlib doesn't have keyword
try:
    from keyword import iskeyword as is_python_keyword
except ImportError:
    _py_identifier_re = re.compile(r'^[a-zA-Z_][a-zA-Z0-9]*$')
    def is_python_keyword(name):
        if _py_identifier_re.search(name) is None:
            return False
        try:
            exec name + " = 42"
        except SyntaxError:
            return False
        return True


# common types. These do exist in the special types module too which however
# does not exist in IronPython out of the box.
class _C(object):
    def method(self): pass
def _func():
    yield None
FunctionType = type(_func)
GeneratorType = type(_func())
MethodType = type(_C.method)
CodeType = type(_C.method.func_code)
try:
    raise TypeError()
except TypeError:
    _tb = sys.exc_info()[2]
    TracebackType = type(_tb)
    FrameType = type(_tb.tb_frame)
del _C, _tb, _func


def contextfunction(f):
    """This decorator can be used to mark a function or method context callable.
A context callable is passed the active :class:`Context` as first argument when
called from the template. This is useful if a function wants to get access
to the context or functions provided on the context object. For example
a function that returns a sorted list of template variables the current
template exports could look like this::

@contextfunction
def get_exported_names(context):
return sorted(context.exported_vars)
"""
    f.contextfunction = True
    return f


def environmentfunction(f):
    """This decorator can be used to mark a function or method as environment
callable. This decorator works exactly like the :func:`contextfunction`
decorator just that the first argument is the active :class:`Environment`
and not context.
"""
    f.environmentfunction = True
    return f


def internalcode(f):
    """Marks the function as internally used"""
    internal_code.add(f.func_code)
    return f


def is_undefined(obj):
    """Check if the object passed is undefined. This does nothing more than
performing an instance check against :class:`Undefined` but looks nicer.
This can be used for custom filters or tests that want to react to
undefined variables. For example a custom default filter can look like
this::

def default(var, default=''):
if is_undefined(var):
return default
return var
"""
    from jinja2.runtime import Undefined
    return isinstance(obj, Undefined)


def consume(iterable):
    """Consumes an iterable without doing anything with it."""
    for event in iterable:
        pass


def clear_caches():
    """Jinja2 keeps internal caches for environments and lexers. These are
used so that Jinja2 doesn't have to recreate environments and lexers all
the time. Normally you don't have to care about that but if you are
messuring memory consumption you may want to clean the caches.
"""
    from jinja2.environment import _spontaneous_environments
    from jinja2.lexer import _lexer_cache
    _spontaneous_environments.clear()
    _lexer_cache.clear()


def import_string(import_name, silent=False):
    """Imports an object based on a string. This use useful if you want to
use import paths as endpoints or something similar. An import path can
be specified either in dotted notation (``xml.sax.saxutils.escape``)
or with a colon as object delimiter (``xml.sax.saxutils:escape``).

If the `silent` is True the return value will be `None` if the import
fails.

:return: imported object
"""
    try:
        if ':' in import_name:
            module, obj = import_name.split(':', 1)
        elif '.' in import_name:
            items = import_name.split('.')
            module = '.'.join(items[:-1])
            obj = items[-1]
        else:
            return __import__(import_name)
        return getattr(__import__(module, None, None, [obj]), obj)
    except (ImportError, AttributeError):
        if not silent:
            raise


def open_if_exists(filename, mode='r'):
    """Returns a file descriptor for the filename if that file exists,
otherwise `None`.
"""
    try:
        return file(filename, mode)
    except IOError, e:
        if e.errno not in (errno.ENOENT, errno.EISDIR):
            raise


def pformat(obj, verbose=False):
    """Prettyprint an object. Either use the `pretty` library or the
builtin `pprint`.
"""
    try:
        from pretty import pretty
        return pretty(obj, verbose=verbose)
    except ImportError:
        from pprint import pformat
        return pformat(obj)


def urlize(text, trim_url_limit=None, nofollow=False):
    """Converts any URLs in text into clickable links. Works on http://,
https:// and www. links. Links can have trailing punctuation (periods,
commas, close-parens) and leading punctuation (opening parens) and
it'll still do the right thing.

If trim_url_limit is not None, the URLs in link text will be limited
to trim_url_limit characters.

If nofollow is True, the URLs in link text will get a rel="nofollow"
attribute.
"""
    trim_url = lambda x, limit=trim_url_limit: limit is not None \
                         and (x[:limit] + (len(x) >=limit and '...'
                         or '')) or x
    words = _word_split_re.split(unicode(escape(text)))
    nofollow_attr = nofollow and ' rel="nofollow"' or ''
    for i, word in enumerate(words):
        match = _punctuation_re.match(word)
        if match:
            lead, middle, trail = match.groups()
            if middle.startswith('www.') or (
                '@' not in middle and
                not middle.startswith('http://') and
                len(middle) > 0 and
                middle[0] in _letters + _digits and (
                    middle.endswith('.org') or
                    middle.endswith('.net') or
                    middle.endswith('.com')
                )):
                middle = '<a href="http://%s"%s>%s</a>' % (middle,
                    nofollow_attr, trim_url(middle))
            if middle.startswith('http://') or \
               middle.startswith('https://'):
                middle = '<a href="%s"%s>%s</a>' % (middle,
                    nofollow_attr, trim_url(middle))
            if '@' in middle and not middle.startswith('www.') and \
               not ':' in middle and _simple_email_re.match(middle):
                middle = '<a href="mailto:%s">%s</a>' % (middle, middle)
            if lead + middle + trail != word:
                words[i] = lead + middle + trail
    return u''.join(words)


def generate_lorem_ipsum(n=5, html=True, min=20, max=100):
    """Generate some lorem impsum for the template."""
    from jinja2.constants import LOREM_IPSUM_WORDS
    from random import choice, randrange
    words = LOREM_IPSUM_WORDS.split()
    result = []

    for _ in xrange(n):
        next_capitalized = True
        last_comma = last_fullstop = 0
        word = None
        last = None
        p = []

        # each paragraph contains out of 20 to 100 words.
        for idx, _ in enumerate(xrange(randrange(min, max))):
            while True:
                word = choice(words)
                if word != last:
                    last = word
                    break
            if next_capitalized:
                word = word.capitalize()
                next_capitalized = False
            # add commas
            if idx - randrange(3, 8) > last_comma:
                last_comma = idx
                last_fullstop += 2
                word += ','
            # add end of sentences
            if idx - randrange(10, 20) > last_fullstop:
                last_comma = last_fullstop = idx
                word += '.'
                next_capitalized = True
            p.append(word)

        # ensure that the paragraph ends with a dot.
        p = u' '.join(p)
        if p.endswith(','):
            p = p[:-1] + '.'
        elif not p.endswith('.'):
            p += '.'
        result.append(p)

    if not html:
        return u'\n\n'.join(result)
    return Markup(u'\n'.join(u'<p>%s</p>' % escape(x) for x in result))


class Markup(unicode):
    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. If you want to use autoescaping in Jinja just enable the
autoescaping feature in the environment.

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 &lt;em&gt;World&lt;/em&gt;!')

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 &amp; bar</em>')
>>> strong = Markup("<strong>%(text)s</strong>")
>>> strong % {'text': '<blink>hacker here</blink>'}
Markup(u'<strong>&lt;blink&gt;hacker here&lt;/blink&gt;</strong>')
>>> Markup("<em>Hello</em> ") + "<foo>"
Markup(u'<em>Hello</em> &lt;foo&gt;')
"""
    __slots__ = ()

    def __new__(cls, base=u'', encoding=None, errors='strict'):
        if hasattr(base, '__html__'):
            base = base.__html__()
        if encoding is None:
            return unicode.__new__(cls, base)
        return unicode.__new__(cls, base, encoding, errors)

    def __html__(self):
        return self

    def __add__(self, other):
        if hasattr(other, '__html__') or isinstance(other, basestring):
            return self.__class__(unicode(self) + unicode(escape(other)))
        return NotImplemented

    def __radd__(self, other):
        if hasattr(other, '__html__') or isinstance(other, basestring):
            return self.__class__(unicode(escape(other)) + unicode(self))
        return NotImplemented

    def __mul__(self, num):
        if isinstance(num, (int, long)):
            return self.__class__(unicode.__mul__(self, num))
        return NotImplemented
    __rmul__ = __mul__

    def __mod__(self, arg):
        if isinstance(arg, tuple):
            arg = tuple(imap(_MarkupEscapeHelper, arg))
        else:
            arg = _MarkupEscapeHelper(arg)
        return self.__class__(unicode.__mod__(self, arg))

    def __repr__(self):
        return '%s(%s)' % (
            self.__class__.__name__,
            unicode.__repr__(self)
        )

    def join(self, seq):
        return self.__class__(unicode.join(self, imap(escape, seq)))
    join.__doc__ = unicode.join.__doc__

    def split(self, *args, **kwargs):
        return map(self.__class__, unicode.split(self, *args, **kwargs))
    split.__doc__ = unicode.split.__doc__

    def rsplit(self, *args, **kwargs):
        return map(self.__class__, unicode.rsplit(self, *args, **kwargs))
    rsplit.__doc__ = unicode.rsplit.__doc__

    def splitlines(self, *args, **kwargs):
        return map(self.__class__, unicode.splitlines(self, *args, **kwargs))
    splitlines.__doc__ = unicode.splitlines.__doc__

    def unescape(self):
        r"""Unescape markup again into an unicode string. This also resolves
known HTML4 and XHTML entities:

>>> Markup("Main &raquo; <em>About</em>").unescape()
u'Main \xbb <em>About</em>'
"""
        from jinja2.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, unicode(self))

    def striptags(self):
        r"""Unescape markup into an unicode string and strip all tags. This
also resolves known HTML4 and XHTML entities. Whitespace is
normalized to one:

>>> Markup("Main &raquo; <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(unicode, name)
        def func(self, *args, **kwargs):
            args = _escape_argspec(list(args), enumerate(args))
            _escape_argspec(kwargs, kwargs.iteritems())
            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(unicode, 'partition'):
        partition = make_wrapper('partition'),
        rpartition = make_wrapper('rpartition')

    # new in python 2.6
    if hasattr(unicode, 'format'):
        format = make_wrapper('format')

    # not in python 3
    if hasattr(unicode, '__getslice__'):
        __getslice__ = make_wrapper('__getslice__')

    del method, make_wrapper


def _escape_argspec(obj, iterable):
    """Helper for various string-wrapped functions."""
    for key, value in iterable:
        if hasattr(value, '__html__') or isinstance(value, basestring):
            obj[key] = escape(value)
    return obj


class _MarkupEscapeHelper(object):
    """Helper for Markup.__mod__"""

    def __init__(self, obj):
        self.obj = obj

    __getitem__ = lambda s, x: _MarkupEscapeHelper(s.obj[x])
    __unicode__ = lambda s: unicode(escape(s.obj))
    __str__ = lambda s: str(escape(s.obj))
    __repr__ = lambda s: str(escape(repr(s.obj)))
    __int__ = lambda s: int(s.obj)
    __float__ = lambda s: float(s.obj)


class LRUCache(object):
    """A simple LRU Cache implementation."""

    # this is fast for small capacities (something below 1000) but doesn't
    # scale. But as long as it's only used as storage for templates this
    # won't do any harm.

    def __init__(self, capacity):
        self.capacity = capacity
        self._mapping = {}
        self._queue = deque()
        self._postinit()

    def _postinit(self):
        # alias all queue methods for faster lookup
        self._popleft = self._queue.popleft
        self._pop = self._queue.pop
        if hasattr(self._queue, 'remove'):
            self._remove = self._queue.remove
        self._wlock = allocate_lock()
        self._append = self._queue.append

    def _remove(self, obj):
        """Python 2.4 compatibility."""
        for idx, item in enumerate(self._queue):
            if item == obj:
                del self._queue[idx]
                break

    def __getstate__(self):
        return {
            'capacity': self.capacity,
            '_mapping': self._mapping,
            '_queue': self._queue
        }

    def __setstate__(self, d):
        self.__dict__.update(d)
        self._postinit()

    def __getnewargs__(self):
        return (self.capacity,)

    def copy(self):
        """Return an shallow copy of the instance."""
        rv = self.__class__(self.capacity)
        rv._mapping.update(self._mapping)
        rv._queue = deque(self._queue)
        return rv

    def get(self, key, default=None):
        """Return an item from the cache dict or `default`"""
        try:
            return self[key]
        except KeyError:
            return default

    def setdefault(self, key, default=None):
        """Set `default` if the key is not in the cache otherwise
leave unchanged. Return the value of this key.
"""
        try:
            return self[key]
        except KeyError:
            self[key] = default
            return default

    def clear(self):
        """Clear the cache."""
        self._wlock.acquire()
        try:
            self._mapping.clear()
            self._queue.clear()
        finally:
            self._wlock.release()

    def __contains__(self, key):
        """Check if a key exists in this cache."""
        return key in self._mapping

    def __len__(self):
        """Return the current size of the cache."""
        return len(self._mapping)

    def __repr__(self):
        return '<%s %r>' % (
            self.__class__.__name__,
            self._mapping
        )

    def __getitem__(self, key):
        """Get an item from the cache. Moves the item up so that it has the
highest priority then.

Raise an `KeyError` if it does not exist.
"""
        rv = self._mapping[key]
        if self._queue[-1] != key:
            try:
                self._remove(key)
            except ValueError:
                # if something removed the key from the container
                # when we read, ignore the ValueError that we would
                # get otherwise.
                pass
            self._append(key)
        return rv

    def __setitem__(self, key, value):
        """Sets the value for an item. Moves the item up so that it
has the highest priority then.
"""
        self._wlock.acquire()
        try:
            if key in self._mapping:
                try:
                    self._remove(key)
                except ValueError:
                    # __getitem__ is not locked, it might happen
                    pass
            elif len(self._mapping) == self.capacity:
                del self._mapping[self._popleft()]
            self._append(key)
            self._mapping[key] = value
        finally:
            self._wlock.release()

    def __delitem__(self, key):
        """Remove an item from the cache dict.
Raise an `KeyError` if it does not exist.
"""
        self._wlock.acquire()
        try:
            del self._mapping[key]
            try:
                self._remove(key)
            except ValueError:
                # __getitem__ is not locked, it might happen
                pass
        finally:
            self._wlock.release()

    def items(self):
        """Return a list of items."""
        result = [(key, self._mapping[key]) for key in list(self._queue)]
        result.reverse()
        return result

    def iteritems(self):
        """Iterate over all items."""
        return iter(self.items())

    def values(self):
        """Return a list of all values."""
        return [x[1] for x in self.items()]

    def itervalue(self):
        """Iterate over all values."""
        return iter(self.values())

    def keys(self):
        """Return a list of all keys ordered by most recent usage."""
        return list(self)

    def iterkeys(self):
        """Iterate over all keys in the cache dict, ordered by
the most recent usage.
"""
        return reversed(tuple(self._queue))

    __iter__ = iterkeys

    def __reversed__(self):
        """Iterate over the values in the cache dict, oldest items
coming first.
"""
        return iter(tuple(self._queue))

    __copy__ = copy


# register the LRU cache as mutable mapping if possible
try:
    from collections import MutableMapping
    MutableMapping.register(LRUCache)
except ImportError:
    pass


class Cycler(object):
    """A cycle helper for templates."""

    def __init__(self, *items):
        if not items:
            raise RuntimeError('at least one item has to be provided')
        self.items = items
        self.reset()

    def reset(self):
        """Resets the cycle."""
        self.pos = 0

    @property
    def current(self):
        """Returns the current item."""
        return self.items[self.pos]

    def next(self):
        """Goes one item ahead and returns it."""
        rv = self.current
        self.pos = (self.pos + 1) % len(self.items)
        return rv


class Joiner(object):
    """A joining helper for templates."""

    def __init__(self, sep=u', '):
        self.sep = sep
        self.used = False

    def __call__(self):
        if not self.used:
            self.used = True
            return u''
        return self.sep


# we have to import it down here as the speedups module imports the
# markup type which is define above.
try:
    from jinja2._speedups import escape, soft_unicode
except ImportError:
    def escape(s):
        """Convert the characters &, <, >, ' and " in string s to HTML-safe
sequences. Use this if you need to display text that might contain
such characters in HTML. Marks return value as markup string.
"""
        if hasattr(s, '__html__'):
            return s.__html__()
        return Markup(unicode(s)
            .replace('&', '&amp;')
            .replace('>', '&gt;')
            .replace('<', '&lt;')
            .replace("'", '&#39;')
            .replace('"', '&#34;')
        )

    def soft_unicode(s):
        """Make a string unicode if it isn't already. That way a markup
string is not converted back to unicode.
"""
        if not isinstance(s, unicode):
            s = unicode(s)
        return s


# partials
try:
    from functools import partial
except ImportError:
    class partial(object):
        def __init__(self, _func, *args, **kwargs):
            self._func = _func
            self._args = args
            self._kwargs = kwargs
        def __call__(self, *args, **kwargs):
            kwargs.update(self._kwargs)
            return self._func(*(self._args + args), **kwargs)
Something went wrong with that request. Please try again.