Add argument to CParser.__init__ for overriding the yacc start symbol. (#159)

* Add argument to CParser.__init__ for overriding the yacc start symbol.

* Add a test for the new 'start' argument of CParser.__init__.

* Add documentation for the new 'start' argument of CParser.__init__.

1 files changed, 9 insertions, 0 deletions

diff --git a/tests/test_c_parser.py b/tests/test_c_parser.py
index 2bd43d1..826f875 100755
--- a/tests/test_c_parser.py
+++ b/tests/test_c_parser.py
@@ -1898,6 +1898,15 @@ class TestCParser_typenames(TestCParser_base):
         self.assertRaises(ParseError, self.parse, s2)
 
 
+class TestCParser_extra(unittest.TestCase):
+    def test_start_symbol(self):
+        parser = c_parser.CParser(lex_optimize=False, yacc_debug=True,
+                                  yacc_optimize=False, yacctab='yacctab',
+                                  start='expression')
+        ast = parser.parse("1 + 2")
+        assert isinstance(ast, BinaryOp)
+
+
 if __name__ == '__main__':
     #~ suite = unittest.TestLoader().loadTestsFromNames(
         #~ ['test_c_parser.TestCParser_fundamentals.test_typedef'])