Add Python templating engine Jinja2 to third_party

third_party/jinja2/_markupsafe/_native.py

Index: third_party/jinja2/_markupsafe/_native.py
diff --git a/third_party/jinja2/_markupsafe/_native.py b/third_party/jinja2/_markupsafe/_native.py
new file mode 100644
index 0000000000000000000000000000000000000000..7b95828ec87f7e7e2c8af4e5ce343eedbe3fa038
--- /dev/null
+++ b/third_party/jinja2/_markupsafe/_native.py
@@ -0,0 +1,45 @@
+# -*- coding: utf-8 -*-
+"""
+    markupsafe._native
+    ~~~~~~~~~~~~~~~~~~
+
+    Native Python implementation the C module is not compiled.
+
+    :copyright: (c) 2010 by Armin Ronacher.
+    :license: BSD, see LICENSE for more details.
+"""
+from jinja2._markupsafe import Markup
+
+
+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 escape_silent(s):
+    """Like :func:`escape` but converts `None` into an empty
+    markup string.
+    """
+    if s is None:
+        return Markup()
+    return escape(s)
+
+
+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