1 files changed, 15 insertions, 1 deletions
diff --git a/prolog/lexer.py b/prolog/lexer.py
index 971e8a6..42d1620 100644
--- a/prolog/lexer.py
+++ b/prolog/lexer.py
@@ -69,7 +69,8 @@ def t_comment(t):
 
 def t_NAME(t):
     r"'(''|\\.|[^\\'])*'|[a-z][a-zA-Z0-9_]*|[-+*/\\^<>=~:.?@#$&]+|!|;|,"
-    if t.lexer.lexpos >= len(t.lexer.lexdata) or t.lexer.lexdata[t.lexer.lexpos] != '(':
+    if t.value == ',' or \
+       t.lexer.lexpos >= len(t.lexer.lexdata) or t.lexer.lexdata[t.lexer.lexpos] != '(':
         t.type = operators.get(t.value, 'NAME')
     return t
 
@@ -88,3 +89,16 @@ def t_error(t):
     return t
 
 lexer = lex.lex()
+
+if __name__ == '__main__':
+    while True:
+        try:
+            s = input('> ')
+        except EOFError:
+            break
+        if not s:
+            continue
+
+        lexer.input(s)
+        tokens = list(lexer)
+        print(tokens)