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https://github.com/python/cpython
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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"
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#include "errcode.h"
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#include "state.h"
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/* Traverse and remember all f-string buffers, in order to be able to restore
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them after reallocating tok->buf */
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void
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_PyLexer_remember_fstring_buffers(struct tok_state *tok)
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{
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int index;
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tokenizer_mode *mode;
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for (index = tok->tok_mode_stack_index; index >= 0; --index) {
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mode = &(tok->tok_mode_stack[index]);
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mode->f_string_start_offset = mode->f_string_start - tok->buf;
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mode->f_string_multi_line_start_offset = mode->f_string_multi_line_start - tok->buf;
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}
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}
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/* Traverse and restore all f-string buffers after reallocating tok->buf */
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void
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_PyLexer_restore_fstring_buffers(struct tok_state *tok)
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{
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int index;
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tokenizer_mode *mode;
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for (index = tok->tok_mode_stack_index; index >= 0; --index) {
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mode = &(tok->tok_mode_stack[index]);
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mode->f_string_start = tok->buf + mode->f_string_start_offset;
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mode->f_string_multi_line_start = tok->buf + mode->f_string_multi_line_start_offset;
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}
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}
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/* Read a line of text from TOK into S, using the stream in TOK.
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Return NULL on failure, else S.
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On entry, tok->decoding_buffer will be one of:
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1) NULL: need to call tok->decoding_readline to get a new line
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2) PyUnicodeObject *: decoding_feof has called tok->decoding_readline and
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stored the result in tok->decoding_buffer
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3) PyByteArrayObject *: previous call to tok_readline_recode did not have enough room
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(in the s buffer) to copy entire contents of the line read
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by tok->decoding_readline. tok->decoding_buffer has the overflow.
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In this case, tok_readline_recode is called in a loop (with an expanded buffer)
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until the buffer ends with a '\n' (or until the end of the file is
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reached): see tok_nextc and its calls to tok_reserve_buf.
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*/
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int
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_PyLexer_tok_reserve_buf(struct tok_state *tok, Py_ssize_t size)
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{
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Py_ssize_t cur = tok->cur - tok->buf;
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Py_ssize_t oldsize = tok->inp - tok->buf;
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Py_ssize_t newsize = oldsize + Py_MAX(size, oldsize >> 1);
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if (newsize > tok->end - tok->buf) {
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char *newbuf = tok->buf;
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Py_ssize_t start = tok->start == NULL ? -1 : tok->start - tok->buf;
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Py_ssize_t line_start = tok->start == NULL ? -1 : tok->line_start - tok->buf;
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Py_ssize_t multi_line_start = tok->multi_line_start - tok->buf;
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_PyLexer_remember_fstring_buffers(tok);
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newbuf = (char *)PyMem_Realloc(newbuf, newsize);
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if (newbuf == NULL) {
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tok->done = E_NOMEM;
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return 0;
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}
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tok->buf = newbuf;
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tok->cur = tok->buf + cur;
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tok->inp = tok->buf + oldsize;
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tok->end = tok->buf + newsize;
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tok->start = start < 0 ? NULL : tok->buf + start;
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tok->line_start = line_start < 0 ? NULL : tok->buf + line_start;
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tok->multi_line_start = multi_line_start < 0 ? NULL : tok->buf + multi_line_start;
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_PyLexer_restore_fstring_buffers(tok);
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}
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return 1;
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}
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