fix the case where the first statement in a file is empty (just a semicolon). Fix provided by Andreas Kloeckner

4 files changed, 11 insertions, 2 deletions

diff --git a/examples/c-to-c.py b/examples/c-to-c.py
index ca76cc5..c40d162 100644
--- a/examples/c-to-c.py
+++ b/examples/c-to-c.py
@@ -33,6 +33,7 @@ def zz_test_translate():
 int main(void)
 {
     unsigned int long k = 4;
+    int p = - - k;
     return 0;
 }
 '''
@@ -52,7 +53,7 @@ int main(void)
 
 #------------------------------------------------------------------------------
 if __name__ == "__main__":
-    #zz_test_translate()
+    zz_test_translate()
     if len(sys.argv) > 1:
         translate_to_c(sys.argv[1])
     else:
diff --git a/pycparser/c_parser.py b/pycparser/c_parser.py
index 7205842..75381ca 100644
--- a/pycparser/c_parser.py
+++ b/pycparser/c_parser.py
@@ -355,7 +355,9 @@ class CParser(PLYParser):
     def p_translation_unit_2(self, p):
         """ translation_unit    : translation_unit external_declaration
         """
-        if p[2] is not None:
+        if p[1].ext is None:
+            p[1].ext = p[2]
+        elif p[2] is not None:
             p[1].ext.extend(p[2])
         p[0] = p[1]
     
diff --git a/tests/test_c_generator.py b/tests/test_c_generator.py
index 0606d6a..e321bb6 100644
--- a/tests/test_c_generator.py
+++ b/tests/test_c_generator.py
@@ -79,11 +79,13 @@ class TestCtoC(unittest.TestCase):
             }''')
 
     def test_statements(self):
+        # note two minuses here
         self._assert_ctoc_correct(r'''
             int main() {
                 int a;
                 a = 5;
                 ;
+                b = - - a;
                 return a;
             }''')
     
diff --git a/tests/test_c_parser.py b/tests/test_c_parser.py
index 1abf1cb..f14d542 100644
--- a/tests/test_c_parser.py
+++ b/tests/test_c_parser.py
@@ -113,6 +113,10 @@ class TestCParser_fundamentals(TestCParser_base):
         self.failUnless(isinstance(t2, FileAST))
         self.assertEqual(len(t2.ext), 0)
 
+        # First statement empty
+        t = self.parse('; char c;')
+        self.assertEqual(len(t.ext), 1)
+
     def test_empty_toplevel_decl(self):
         code = 'int foo;;'
         t = self.parse(code)