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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/pegen_errors.c
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@ -165,7 +165,7 @@ _PyPegen_tokenize_full_source_to_check_for_errors(Parser *p) {
int ret = 0;
struct token new_token;
new_token.metadata = NULL;
_PyToken_Init(&new_token);
for (;;) {
switch (_PyTokenizer_Get(p->tok, &new_token)) {
@ -193,7 +193,7 @@ _PyPegen_tokenize_full_source_to_check_for_errors(Parser *p) {
exit:
Py_XDECREF(new_token.metadata);
_PyToken_Free(&new_token);
// If we're in an f-string, we want the syntax error in the expression part
// to propagate, so that tokenizer errors (like expecting '}') that happen afterwards
// do not swallow it.