python27/guestbook/jinja2/_markupsafe/_native.py

   1 # -*- coding: utf-8 -*-
   2 """
   3     markupsafe._native
   4     ~~~~~~~~~~~~~~~~~~
   5
   6     Native Python implementation the C module is not compiled.
   7
   8     :copyright: (c) 2010 by Armin Ronacher.
   9     :license: BSD, see LICENSE for more details.
  10 """
  11 from jinja2._markupsafe import Markup
  12
  13
  14 def escape(s):
  15     """Convert the characters &, <, >, ' and " in string s to HTML-safe
  16     sequences.  Use this if you need to display text that might contain
  17     such characters in HTML.  Marks return value as markup string.
  18     """
  19     if hasattr(s, '__html__'):
  20         return s.__html__()
  21     return Markup(unicode(s)
  22         .replace('&', '&amp;')
  23         .replace('>', '&gt;')
  24         .replace('<', '&lt;')
  25         .replace("'", '&#39;')
  26         .replace('"', '&#34;')
  27     )
  28
  29
  30 def escape_silent(s):
  31     """Like :func:`escape` but converts `None` into an empty
  32     markup string.
  33     """
  34     if s is None:
  35         return Markup()
  36     return escape(s)
  37
  38
  39 def soft_unicode(s):
  40     """Make a string unicode if it isn't already.  That way a markup
  41     string is not converted back to unicode.
  42     """
  43     if not isinstance(s, unicode):
  44         s = unicode(s)
  45     return s