Mention support for async generators

[etc/vim.git] / blib2to3 / pgen2 / tokenize.py

diff --git a/blib2to3/pgen2/tokenize.py b/blib2to3/pgen2/tokenize.py
index 1f51ff0039fd0227df0a5d7f691bbcd684fea795..0912f43b867719f69e987bf1111725f81ed3693a 100644 (file)
--- a/blib2to3/pgen2/tokenize.py
+++ b/blib2to3/pgen2/tokenize.py
@@ -334,7 +334,7 @@ def untokenize(iterable):
     ut = Untokenizer()
     return ut.untokenize(iterable)
 
     ut = Untokenizer()
     return ut.untokenize(iterable)
 

-def generate_tokens(readline):
+def generate_tokens(readline, grammar=None):

     """
     The generate_tokens() generator requires one argument, readline, which
     must be a callable object which provides the same interface as the
     """
     The generate_tokens() generator requires one argument, readline, which
     must be a callable object which provides the same interface as the


@@ -356,6 +356,9 @@ def generate_tokens(readline):
     contline = None
     indents = [0]
 
     contline = None
     indents = [0]
 

+    # If we know we're parsing 3.7+, we can unconditionally parse `async` and
+    # `await` as keywords.
+    async_keywords = False if grammar is None else grammar.async_keywords

     # 'stashed' and 'async_*' are used for async/await parsing
     stashed = None
     async_def = False
     # 'stashed' and 'async_*' are used for async/await parsing
     stashed = None
     async_def = False


@@ -506,7 +509,7 @@ def generate_tokens(readline):
                         yield (STRING, token, spos, epos, line)
                 elif initial.isidentifier():               # ordinary name
                     if token in ('async', 'await'):
                         yield (STRING, token, spos, epos, line)
                 elif initial.isidentifier():               # ordinary name
                     if token in ('async', 'await'):

-                        if async_def:
+                        if async_keywords or async_def:

                             yield (ASYNC if token == 'async' else AWAIT,
                                    token, spos, epos, line)
                             continue
                             yield (ASYNC if token == 'async' else AWAIT,
                                    token, spos, epos, line)
                             continue