Support self matching

Co-Authored-By: Eric Shimizu Karbstein <[email protected]>

Author: aminya

grammars/tree-sitter-python.cson

@@ -82,10 +82,12 @@ scopes:
    ]
   'call > attribute > identifier:nth-child(2)': 'entity.name.function'
 
-  'identifier':
+  'identifier': [
     {match:
       '^(BaseException|Exception|TypeError|StopAsyncIteration|StopIteration|ImportError|ModuleNotFoundError|OSError|ConnectionError|BrokenPipeError|ConnectionAbortedError|ConnectionRefusedError|ConnectionResetError|BlockingIOError|ChildProcessError|FileExistsError|FileNotFoundError|IsADirectoryError|NotADirectoryError|InterruptedError|PermissionError|ProcessLookupError|TimeoutError|EOFError|RuntimeError|RecursionError|NotImplementedError|NameError|UnboundLocalError|AttributeError|SyntaxError|IndentationError|TabError|LookupError|IndexError|KeyError|ValueError|UnicodeError|UnicodeEncodeError|UnicodeDecodeError|UnicodeTranslateError|AssertionError|ArithmeticError|FloatingPointError|OverflowError|ZeroDivisionError|SystemError|ReferenceError|BufferError|MemoryError|Warning|UserWarning|DeprecationWarning|PendingDeprecationWarning|SyntaxWarning|RuntimeWarning|FutureWarning|ImportWarning|UnicodeWarning|BytesWarning|ResourceWarning|GeneratorExit|SystemExit|KeyboardInterrupt)$'
-    scopes: 'support.type.exception'}
+    scopes: 'support.type.exception'},
+    {match: '^(self)', scopes: 'entity.name.variable.self'}
+  ]
 
   'attribute > identifier:nth-child(2)': 'variable.other.object.property'