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Issue #24619: New approach for tokenizing async/await.

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This commit fixes how one-line async-defs and defs are tracked
by tokenizer.  It allows to correctly parse invalid code such
as:

>>> async def f():
...     def g(): pass
...     async = 10

and valid code such as:

>>> async def f():
...     async def g(): pass
...     await z

As a consequence, is is now possible to have one-line
'async def foo(): await ..' functions:

>>> async def foo(): return await bar()
This commit is contained in:
Yury Selivanov 2015-07-22 13:33:45 +03:00
parent 80acc3ebbc
commit 8fb307cd65
13 changed files with 343 additions and 69 deletions
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15
Lib/test/test_tokenize.py
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@ -786,12 +786,12 @@ Async/await extension:
NAME 'def' (2, 2) (2, 5)
NAME 'foo' (2, 6) (2, 9)
OP '(' (2, 9) (2, 10)
NAME 'await' (2, 10) (2, 15)
AWAIT 'await' (2, 10) (2, 15)
OP ')' (2, 15) (2, 16)
OP ':' (2, 16) (2, 17)
NEWLINE '\\n' (2, 17) (2, 18)
INDENT ' ' (3, 0) (3, 4)
NAME 'await' (3, 4) (3, 9)
AWAIT 'await' (3, 4) (3, 9)
OP '=' (3, 10) (3, 11)
NUMBER '1' (3, 12) (3, 13)
NEWLINE '\\n' (3, 13) (3, 14)
@ -829,6 +829,17 @@ Async/await extension:
OP ':' (2, 18) (2, 19)
NAME 'pass' (2, 20) (2, 24)
DEDENT '' (3, 0) (3, 0)
>>> dump_tokens('''async def foo(async): await''')
ENCODING 'utf-8' (0, 0) (0, 0)
ASYNC 'async' (1, 0) (1, 5)
NAME 'def' (1, 6) (1, 9)
NAME 'foo' (1, 10) (1, 13)
OP '(' (1, 13) (1, 14)
ASYNC 'async' (1, 14) (1, 19)
OP ')' (1, 19) (1, 20)
OP ':' (1, 20) (1, 21)
AWAIT 'await' (1, 22) (1, 27)
"""
from test import support