Adding support for callables and Negated values.

examples/complex_view.py

@@ -18,3 +18,6 @@ class ComplexView(pystache.View):
 
     def empty(self):
         return len(self.item()) == 0
+        
+    def empty_list(self):
+        return [];

pystache/template.py

@@ -61,13 +61,20 @@ class Template(object):
             it = view.get(section_name, None)
             replacer = ''
             
+            # Callable
+            if it and isinstance(it, collections.Callable):
+                replacer = it(inner)
             # Dictionary
-            if it and hasattr(it, 'keys') and hasattr(it, '__getitem__'):
+            elif it and hasattr(it, 'keys') and hasattr(it, '__getitem__'):
                 if section[2] != '^':
                     replacer = self._render_dictionary(inner, it)
+            # Lists
             elif it and hasattr(it, '__iter__'):
                 if section[2] != '^':
                     replacer = self._render_list(inner, it)            
+            # Falsey and Negated or Truthy and Not Negated
+            elif (not it and section[2] == '^') or (it and section[2] != '^'):
+                replacer = inner
             
             template = template.replace(section, replacer)
         

tests/test_simple.py

 import unittest
 import pystache
+from examples.nested_context import NestedContext
+from examples.complex_view import ComplexView
+from examples.lambdas import Lambdas
 
 class TestSimple(unittest.TestCase):
     
@@ -7,3 +10,19 @@ class TestSimple(unittest.TestCase):
         tmpl = '{{derp}}'
         
         self.assertEqual('herp', pystache.Template(tmpl, {'derp': 'herp'}).render())
+        
+    def test_nested_context(self):
+        view = NestedContext()
+        self.assertEquals(pystache.Template('{{#foo}}{{thing1}} and {{thing2}} and {{outer_thing}}{{/foo}}{{^foo}}Not foo!{{/foo}}', view).render(), "one and foo and two")
+        
+    def test_looping_and_negation_context(self):
+        view = ComplexView()
+        self.assertEquals(pystache.Template('{{#item}}{{header}}: {{name}} {{/item}}{{^item}} Shouldnt see me{{/item}}', view).render(), "Colors: red Colors: green Colors: blue ")
+
+    def test_empty_context(self):
+        view = ComplexView()
+        self.assertEquals(pystache.Template('{{#empty_list}}Shouldnt see me {{/empty_list}}{{^empty_list}}Should see me{{/empty_list}}', view).render(), "Should see me")
+        
+    def test_callables(self):
+        view = Lambdas()
+        self.assertEquals(pystache.Template('{{#replace_foo_with_bar}}foo != bar. oh, it does!{{/replace_foo_with_bar}}', view).render(), 'bar != bar. oh, it does!')
\ No newline at end of file