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gh-102856: Python tokenizer implementation for PEP 701 (#104323)

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This commit replaces the Python implementation of the tokenize module with an implementation
that reuses the real C tokenizer via a private extension module. The tokenize module now implements
a compatibility layer that transforms tokens from the C tokenizer into Python tokenize tokens for backward
compatibility.

As the C tokenizer does not emit some tokens that the Python tokenizer provides (such as comments and non-semantic newlines), a new special mode has been added to the C tokenizer mode that currently is only used via
the extension module that exposes it to the Python layer. This new mode forces the C tokenizer to emit these new extra tokens and add the appropriate metadata that is needed to match the old Python implementation.

Co-authored-by: Pablo Galindo <pablogsal@gmail.com>
This commit is contained in:
Marta Gómez Macías 2023-05-21 02:03:02 +02:00 • committed by GitHub
parent 3ed57e4995
commit 6715f91edc
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22 changed files with 424 additions and 374 deletions
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Lib/token.py generated
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@ -67,10 +67,10 @@ SOFT_KEYWORD = 60
FSTRING_START = 61
FSTRING_MIDDLE = 62
FSTRING_END = 63
COMMENT = 64
NL = 65
# These aren't used by the C tokenizer but are needed for tokenize.py
ERRORTOKEN = 64
COMMENT = 65
NL = 66
ERRORTOKEN = 66
ENCODING = 67
N_TOKENS = 68
# Special definitions for cooperation with parser