mirror of
https://github.com/python/cpython.git
synced 2024-11-30 18:51:15 +01:00
01481f2dc1
* The lexer, which include the actual lexeme producing logic, goes into the `lexer` directory. * The wrappers, one wrapper per input mode (file, string, utf-8, and readline), go into the `tokenizer` directory and include logic for creating a lexer instance and managing the buffer for different modes. --------- Co-authored-by: Pablo Galindo <pablogsal@gmail.com> Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>
77 lines
2.9 KiB
C
77 lines
2.9 KiB
C
#include "Python.h"
|
|
#include "errcode.h"
|
|
|
|
#include "state.h"
|
|
|
|
/* Traverse and remember all f-string buffers, in order to be able to restore
|
|
them after reallocating tok->buf */
|
|
void
|
|
_PyLexer_remember_fstring_buffers(struct tok_state *tok)
|
|
{
|
|
int index;
|
|
tokenizer_mode *mode;
|
|
|
|
for (index = tok->tok_mode_stack_index; index >= 0; --index) {
|
|
mode = &(tok->tok_mode_stack[index]);
|
|
mode->f_string_start_offset = mode->f_string_start - tok->buf;
|
|
mode->f_string_multi_line_start_offset = mode->f_string_multi_line_start - tok->buf;
|
|
}
|
|
}
|
|
|
|
/* Traverse and restore all f-string buffers after reallocating tok->buf */
|
|
void
|
|
_PyLexer_restore_fstring_buffers(struct tok_state *tok)
|
|
{
|
|
int index;
|
|
tokenizer_mode *mode;
|
|
|
|
for (index = tok->tok_mode_stack_index; index >= 0; --index) {
|
|
mode = &(tok->tok_mode_stack[index]);
|
|
mode->f_string_start = tok->buf + mode->f_string_start_offset;
|
|
mode->f_string_multi_line_start = tok->buf + mode->f_string_multi_line_start_offset;
|
|
}
|
|
}
|
|
|
|
/* Read a line of text from TOK into S, using the stream in TOK.
|
|
Return NULL on failure, else S.
|
|
|
|
On entry, tok->decoding_buffer will be one of:
|
|
1) NULL: need to call tok->decoding_readline to get a new line
|
|
2) PyUnicodeObject *: decoding_feof has called tok->decoding_readline and
|
|
stored the result in tok->decoding_buffer
|
|
3) PyByteArrayObject *: previous call to tok_readline_recode did not have enough room
|
|
(in the s buffer) to copy entire contents of the line read
|
|
by tok->decoding_readline. tok->decoding_buffer has the overflow.
|
|
In this case, tok_readline_recode is called in a loop (with an expanded buffer)
|
|
until the buffer ends with a '\n' (or until the end of the file is
|
|
reached): see tok_nextc and its calls to tok_reserve_buf.
|
|
*/
|
|
int
|
|
_PyLexer_tok_reserve_buf(struct tok_state *tok, Py_ssize_t size)
|
|
{
|
|
Py_ssize_t cur = tok->cur - tok->buf;
|
|
Py_ssize_t oldsize = tok->inp - tok->buf;
|
|
Py_ssize_t newsize = oldsize + Py_MAX(size, oldsize >> 1);
|
|
if (newsize > tok->end - tok->buf) {
|
|
char *newbuf = tok->buf;
|
|
Py_ssize_t start = tok->start == NULL ? -1 : tok->start - tok->buf;
|
|
Py_ssize_t line_start = tok->start == NULL ? -1 : tok->line_start - tok->buf;
|
|
Py_ssize_t multi_line_start = tok->multi_line_start - tok->buf;
|
|
_PyLexer_remember_fstring_buffers(tok);
|
|
newbuf = (char *)PyMem_Realloc(newbuf, newsize);
|
|
if (newbuf == NULL) {
|
|
tok->done = E_NOMEM;
|
|
return 0;
|
|
}
|
|
tok->buf = newbuf;
|
|
tok->cur = tok->buf + cur;
|
|
tok->inp = tok->buf + oldsize;
|
|
tok->end = tok->buf + newsize;
|
|
tok->start = start < 0 ? NULL : tok->buf + start;
|
|
tok->line_start = line_start < 0 ? NULL : tok->buf + line_start;
|
|
tok->multi_line_start = multi_line_start < 0 ? NULL : tok->buf + multi_line_start;
|
|
_PyLexer_restore_fstring_buffers(tok);
|
|
}
|
|
return 1;
|
|
}
|