From 1c42c78b1278bb4906dad1b11d10ee62c1d6c2ea Mon Sep 17 00:00:00 2001
From: Ned Batchelder <ned@nedbatchelder.com>
Date: Tue, 6 May 2014 23:06:43 -0400
Subject: [PATCH] More error checking

---
 template-engine/templite.py      | 10 +++++++---
 template-engine/test_templite.py | 14 ++++++++++++--
 2 files changed, 19 insertions(+), 5 deletions(-)

diff --git a/template-engine/templite.py b/template-engine/templite.py
index 0cf7651f1..8071a922a 100644
--- a/template-engine/templite.py
+++ b/template-engine/templite.py
@@ -165,7 +165,11 @@ def flush_output():
                     code.indent()
                 elif words[0].startswith('end'):
                     # Endsomething.  Pop the ops stack.
+                    if len(words) != 1:
+                        self._syntax_error("Don't understand end", token)
                     end_what = words[0][3:]
+                    if not ops_stack:
+                        self._syntax_error("Too many ends", token)
                     start_what = ops_stack.pop()
                     if start_what != end_what:
                         self._syntax_error("Mismatched end tag", end_what)
@@ -177,14 +181,14 @@ def flush_output():
                 if token:
                     buffered.append(repr(token))
 
+        if ops_stack:
+            self._syntax_error("Unmatched action tag", ops_stack[-1])
+
         flush_output()
 
         for var_name in self.all_vars - self.loop_vars:
             vars_code.add_line("c_%s = ctx[%r]" % (var_name, var_name))
 
-        if ops_stack:
-            self._syntax_error("Unmatched action tag", ops_stack[-1])
-
         code.add_line("return ''.join(result)")
         code.dedent()
         self._render_function = code.get_globals()['render']
diff --git a/template-engine/test_templite.py b/template-engine/test_templite.py
index 3c0d2d453..d821677c6 100644
--- a/template-engine/test_templite.py
+++ b/template-engine/test_templite.py
@@ -1,5 +1,6 @@
 """Tests for templite."""
 
+import re
 from templite import Templite, TempliteSyntaxError
 from unittest import TestCase
 
@@ -32,7 +33,8 @@ def try_render(self, text, ctx=None, result=None):
             self.assertEqual(actual, result)
 
     def assertSynErr(self, msg):
-        return self.assertRaisesRegexp(TempliteSyntaxError, msg)
+        pat = "^" + re.escape(msg) + "$"
+        return self.assertRaisesRegexp(TempliteSyntaxError, pat)
 
     def test_passthrough(self):
         # Strings without variables are passed through unchanged.
@@ -250,7 +252,7 @@ def test_malformed_if(self):
         with self.assertSynErr("Don't understand if: '{% if this or that %}'"):
             self.try_render("Buh? {% if this or that %}hi!{% endif %}")
 
-    def test_malformed_for_(self):
+    def test_malformed_for(self):
         with self.assertSynErr("Don't understand for: '{% for %}'"):
             self.try_render("Weird: {% for %}loop{% endfor %}")
         with self.assertSynErr("Don't understand for: '{% for x from y %}'"):
@@ -263,3 +265,11 @@ def test_bad_nesting(self):
             self.try_render("{% if x %}X")
         with self.assertSynErr("Mismatched end tag: 'for'"):
             self.try_render("{% if x %}X{% endfor %}")
+        with self.assertSynErr("Too many ends: '{% endif %}'"):
+            self.try_render("{% if x %}{% endif %}{% endif %}")
+
+    def test_malformed_end(self):
+        with self.assertSynErr("Don't understand end: '{% end if %}'"):
+            self.try_render("{% if x %}X{% end if %}")
+        with self.assertSynErr("Don't understand end: '{% endif now %}'"):
+            self.try_render("{% if x %}X{% endif now %}")