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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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4
Parser/tokenizer.h
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@ -128,6 +128,8 @@ struct tok_state {
tokenizer_mode tok_mode_stack[MAXFSTRINGLEVEL];
int tok_mode_stack_index;
int tok_report_warnings;
int tok_extra_tokens;
int comment_newline;
#ifdef Py_DEBUG
int debug;
#endif
@ -138,6 +140,8 @@ extern struct tok_state *_PyTokenizer_FromUTF8(const char *, int);
extern struct tok_state *_PyTokenizer_FromFile(FILE *, const char*,
const char *, const char *);
extern void _PyTokenizer_Free(struct tok_state *);
extern void _PyToken_Free(struct token *);
extern void _PyToken_Init(struct token *);
extern int _PyTokenizer_Get(struct tok_state *, struct token *);
#define tok_dump _Py_tok_dump