Add escaped filter

hamlpy/parser/filters.py

@@ -37,6 +37,7 @@
 from future.utils import raise_from
 
 from .core import ParseException
+from .utils import html_escape
 
 
 # ----------------------------------------------------------------------------------
@@ -53,6 +54,10 @@ def preserve(text, options):
     return text.replace('\r', '')
 
 
+def escaped(text, options):
+    return html_escape(text)
+
+
 def cdata(text, options):
     text = '\n' + text.rstrip()
     text = text.replace("\n", "\n    ")
@@ -156,6 +161,7 @@ def script_filter(text, mime_type, comment, options):
 FILTERS = {
     'plain': plain,
     'preserve': preserve,
+    'escaped': escaped,
     'cdata': cdata,
     'css': css,
     'stylus': stylus,

hamlpy/parser/utils.py

@@ -0,0 +1,13 @@
+from __future__ import unicode_literals
+
+
+def html_escape(s):
+    """
+    Escapes HTML entities, matching substitutions used the Ruby Haml library
+    """
+    s = s.replace("&", "&")
+    s = s.replace("<", "&lt;")
+    s = s.replace(">", "&gt;")
+    s = s.replace('"', "&quot;")
+    s = s.replace("'", "&#039;")
+    return s

hamlpy/test/templates/filters.hamlpy

@@ -1,3 +1,5 @@
+:escaped
+  <"&'>
 :javascript
   $(document).ready(function(){
     $("#form{{form.initial.id}}").submit(form_submit);

hamlpy/test/templates/filters.html

@@ -1,3 +1,4 @@
+<"&'>
 <script type='text/javascript'>
   //<![CDATA[
     $(document).ready(function(){