Add optional filtering expression to loop operator

smnp/token/tokenizer.py

@@ -29,6 +29,7 @@ tokenizers = (
     defaultTokenizer(TokenType.CLOSE_ANGLE),
     defaultTokenizer(TokenType.SEMICOLON),
     defaultTokenizer(TokenType.ASTERISK),
+    defaultTokenizer(TokenType.PERCENT),
     defaultTokenizer(TokenType.ASSIGN),
     defaultTokenizer(TokenType.COMMA),
     defaultTokenizer(TokenType.SLASH),

smnp/token/type.py

@@ -14,6 +14,7 @@ class TokenType(Enum):
     CLOSE_ANGLE = '>'
     SEMICOLON = ';'
     ASTERISK = '*'
+    PERCENT = '%'
     ASSIGN = '='
     ARROW = '->'
     COMMA = ','
@@ -44,7 +45,6 @@ class TokenType(Enum):
     AS = 'as'
     IDENTIFIER = 'identifier'
     COMMENT = 'comment'
-    PERCENT = 'percent'
 
     @property
     def key(self):