Never interpret IN keyword as function name (fixes #183).

CHANGES

@@ -8,6 +8,7 @@ Bug Fixes
 * Fix parsing of multi-line comments (issue172, by JacekPliszka).
 * Fix parsing of escaped backslashes (issue174, by caseyching).
 * Fix parsing of identifiers starting with underscore (issue175).
+* Fix misinterpretation of IN keyword (issue183).
 
 Enhancements
 * Improve formatting of HAVING statements.

sqlparse/lexer.py

@@ -186,6 +186,9 @@ class Lexer(object):
             # see https://github.com/andialbrecht/sqlparse/pull/64
             (r'VALUES', tokens.Keyword),
             (r'@[^\W\d_]\w+', tokens.Name),
+            # IN is special, it may be followed by a parenthesis, but
+            # is never a functino, see issue183
+            (r'in\b(?=[ (])?', tokens.Keyword),
             (r'[^\W\d_]\w*(?=[.(])', tokens.Name),  # see issue39
             (r'[-]?0x[0-9a-fA-F]+', tokens.Number.Hexadecimal),
             (r'[-]?[0-9]*(\.[0-9]+)?[eE][-]?[0-9]+', tokens.Number.Float),

tests/test_grouping.py

@@ -207,6 +207,12 @@ def test_function(self):
         self.assert_(isinstance(p.tokens[0], sql.Function))
         self.assertEqual(len(list(p.tokens[0].get_parameters())), 2)
 
+    def test_function_not_in(self):  # issue183
+        p = sqlparse.parse('in(1, 2)')[0]
+        self.assertEqual(len(p.tokens), 2)
+        self.assertEqual(p.tokens[0].ttype, T.Keyword)
+        self.assert_(isinstance(p.tokens[1], sql.Parenthesis))
+
     def test_varchar(self):
         p = sqlparse.parse('"text" Varchar(50) NOT NULL')[0]
         self.assert_(isinstance(p.tokens[2], sql.Function))
@@ -385,4 +391,4 @@ def test_aliased_function_without_as():
 def test_aliased_literal_without_as():
     p = sqlparse.parse('1 foo')[0].tokens
     assert len(p) == 1
-    assert p[0].get_alias() == 'foo'
+    assert p[0].get_alias() == 'foo'