fix E103 to handle double braces

dennis/linter.py

@@ -1,4 +1,5 @@
 import re
+import uuid
 from collections import namedtuple
 from itertools import zip_longest
 
@@ -195,16 +196,25 @@ def lint(self, vartok, linted_entry):
             return []
 
         malformed_re = re.compile(r"(?:(?:^|\})[^\{]*\})")
+        double_open = str(uuid.uuid4())
+        double_close = str(uuid.uuid4())
 
         for trstr in linted_entry.strs:
             if not trstr.msgstr_string:
                 continue
 
-            malformed = malformed_re.findall(trstr.msgstr_string)
+            malformed = malformed_re.findall(
+                trstr.msgstr_string.replace("{{", double_open).replace(
+                    "}}", double_close
+                )
+            )
             if not malformed:
                 continue
 
-            malformed = [item.strip() for item in malformed]
+            malformed = [
+                item.strip().replace(double_open, "{{").replace(double_close, "}}")
+                for item in malformed
+            ]
             msgs.append(
                 LintMessage(
                     ERROR,

tests/test_linter.py

@@ -335,6 +335,15 @@ def test_python_var_missing_left_curly_brace(self):
         assert msgs[0].code == "E103"
         assert msgs[0].msg == "missing left curly-brace: }}"
 
+    def test_double_braces(self):
+        linted_entry = build_linted_entry(
+            'msgid "This is {{literal}} brace, {0}, and {{another}}."\n'
+            'msgstr "This is {{literal}} brace, {0}, and {{another}}."\n'
+        )
+
+        msgs = self.lintrule.lint(self.vartok, linted_entry)
+        assert len(msgs) == 0
+
     def test_varformat_empty(self):
         vartok = VariableTokenizer([])