Mojo: Mojom: Make specialized handle types (e.g., message_pipe) not keywords.

Other types (e.g., int32) aren't keywords, so it's a bit anomalous that
the specialized handle types are. (Insisting that they be keywords makes
adding future handle types more difficult, since doing so could break
existing .mojom files.)

R=darin@chromium.org

Review URL: https://codereview.chromium.org/295773002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271519 0039d316-1c4b-4281-b951-d872f2087c98

mojo/public/tools/bindings/pylib/mojom/parse/lexer.py

@@ -57,10 +57,6 @@ class Lexer(object):
   ##
   keywords = (
     'HANDLE',
-    'DATA_PIPE_CONSUMER',
-    'DATA_PIPE_PRODUCER',
-    'MESSAGE_PIPE',
-    'SHARED_BUFFER',
 
     'IMPORT',
     'MODULE',

mojo/public/tools/bindings/pylib/mojom/parse/parser.py

@@ -193,20 +193,25 @@ class Parser(object):
 
   def p_basictypename(self, p):
     """basictypename : identifier
-                     | HANDLE
-                     | specializedhandle"""
+                     | handletype"""
     p[0] = p[1]
 
-  def p_specializedhandle(self, p):
-    """specializedhandle : HANDLE LANGLE specializedhandlename RANGLE"""
-    p[0] = "handle<" + p[3] + ">"
-
-  def p_specializedhandlename(self, p):
-    """specializedhandlename : DATA_PIPE_CONSUMER
-                             | DATA_PIPE_PRODUCER
-                             | MESSAGE_PIPE
-                             | SHARED_BUFFER"""
-    p[0] = p[1]
+  def p_handletype(self, p):
+    """handletype : HANDLE
+                  | HANDLE LANGLE identifier RANGLE"""
+    if len(p) == 2:
+      p[0] = p[1]
+    else:
+      if p[3] not in ('data_pipe_consumer',
+                      'data_pipe_producer',
+                      'message_pipe',
+                      'shared_buffer'):
+        # Note: We don't enable tracking of line numbers for everything, so we
+        # can't use |p.lineno(3)|.
+        raise ParseError(self.filename, "Invalid handle type %r:" % p[3],
+                         lineno=p.lineno(1),
+                         snippet=self._GetSnippet(p.lineno(1)))
+      p[0] = "handle<" + p[3] + ">"
 
   def p_array(self, p):
     """array : typename LBRACKET RBRACKET"""

mojo/public/tools/bindings/pylib/mojom_tests/parse/lexer_unittest.py

@@ -67,12 +67,6 @@ class LexerTest(unittest.TestCase):
     """Tests valid keywords."""
     self.assertEquals(self._SingleTokenForInput("handle"),
                       _MakeLexTokenForKeyword("handle"))
-    self.assertEquals(self._SingleTokenForInput("data_pipe_consumer"),
-                      _MakeLexTokenForKeyword("data_pipe_consumer"))
-    self.assertEquals(self._SingleTokenForInput("data_pipe_producer"),
-                      _MakeLexTokenForKeyword("data_pipe_producer"))
-    self.assertEquals(self._SingleTokenForInput("message_pipe"),
-                      _MakeLexTokenForKeyword("message_pipe"))
     self.assertEquals(self._SingleTokenForInput("import"),
                       _MakeLexTokenForKeyword("import"))
     self.assertEquals(self._SingleTokenForInput("module"),

mojo/public/tools/bindings/pylib/mojom_tests/parse/parser_unittest.py

@@ -311,7 +311,7 @@ struct MyStruct {
       parser.Parse(source6, "my_file.mojom")
 
   def testNestedNamespace(self):
-    """Tests nested namespaces work."""
+    """Tests that "nested" namespaces work."""
     source = """\
 module my.mod {
 
@@ -331,6 +331,47 @@ struct MyStruct {
     [('FIELD', 'int32', 'a', ast.Ordinal(None), None)])])]
     self.assertEquals(parser.Parse(source, "my_file.mojom"), expected)
 
+  def testValidHandleTypes(self):
+    """Tests (valid) handle types."""
+    source = """\
+struct MyStruct {
+  handle a;
+  handle<data_pipe_consumer> b;
+  handle <data_pipe_producer> c;
+  handle < message_pipe > d;
+  handle
+    < shared_buffer
+    > e;
+};
+"""
+    expected = \
+[('MODULE',
+  '',
+  None,
+  [('STRUCT',
+    'MyStruct',
+    None,
+    [('FIELD', 'handle', 'a', ast.Ordinal(None), None),
+     ('FIELD', 'handle<data_pipe_consumer>', 'b', ast.Ordinal(None), None),
+     ('FIELD', 'handle<data_pipe_producer>', 'c', ast.Ordinal(None), None),
+     ('FIELD', 'handle<message_pipe>', 'd', ast.Ordinal(None), None),
+     ('FIELD', 'handle<shared_buffer>', 'e', ast.Ordinal(None), None)])])]
+    self.assertEquals(parser.Parse(source, "my_file.mojom"), expected)
+
+  def testInvalidHandleType(self):
+    """Tests an invalid (unknown) handle type."""
+    source = """\
+struct MyStruct {
+  handle<wtf_is_this> foo;
+};
+"""
+    with self.assertRaisesRegexp(
+        parser.ParseError,
+        r"^my_file\.mojom:2: Error: "
+            r"Invalid handle type 'wtf_is_this':\n"
+            r"  handle<wtf_is_this> foo;$"):
+      parser.Parse(source, "my_file.mojom")
+
 
 if __name__ == "__main__":
   unittest.main()