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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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10
Lib/tabnanny.py
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@ -107,6 +107,10 @@ def check(file):
errprint("%r: Token Error: %s" % (file, msg))
return
except SyntaxError as msg:
errprint("%r: Token Error: %s" % (file, msg))
return
except IndentationError as msg:
errprint("%r: Indentation Error: %s" % (file, msg))
return
@ -272,6 +276,12 @@ def format_witnesses(w):
return prefix + " " + ', '.join(firsts)
def process_tokens(tokens):
try:
_process_tokens(tokens)
except TabError as e:
raise NannyNag(e.lineno, e.msg, e.text)
def _process_tokens(tokens):
INDENT = tokenize.INDENT
DEDENT = tokenize.DEDENT
NEWLINE = tokenize.NEWLINE