Add support for walrus operator (#935)

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

diff --git a/blib2to3/pgen2/tokenize.py b/blib2to3/pgen2/tokenize.py
index 9a7664bbf95bf81d1809922dcaf53433bae61454..a5c6462e7cfaeeaf47f5b685c723d1f079d5bbc2 100644 (file)
--- a/blib2to3/pgen2/tokenize.py
+++ b/blib2to3/pgen2/tokenize.py
@@ -89,7 +89,7 @@ String = group(_litprefix + r"'[^\n'\\]*(?:\\.[^\n'\\]*)*'",
 # recognized as two instances of =).
 Operator = group(r"\*\*=?", r">>=?", r"<<=?", r"<>", r"!=",
                  r"//=?", r"->",
-                 r"[+\-*/%&@|^=<>]=?",
+                 r"[+\-*/%&@|^=<>:]=?",
                  r"~")
 
 Bracket = '[][(){}]'
@@ -334,7 +334,7 @@ def 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
@@ -356,6 +356,9 @@ def generate_tokens(readline):
     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
@@ -506,7 +509,7 @@ def generate_tokens(readline):
                         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
@@ -516,13 +519,14 @@ def generate_tokens(readline):
                         stashed = tok
                         continue
 
-                    if token == 'def':
+                    if token in ('def', 'for'):
                         if (stashed
                                 and stashed[0] == NAME
                                 and stashed[1] == 'async'):
 
-                            async_def = True
-                            async_def_indent = indents[-1]
+                            if token == 'def':
+                                async_def = True
+                                async_def_indent = indents[-1]
 
                             yield (ASYNC, stashed[1],
                                    stashed[2], stashed[3],