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gh-104169: Refactor tokenizer into lexer and wrappers (#110684)

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* 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>
This commit is contained in:
Lysandros Nikolaou 2023-10-11 17:14:44 +02:00 • committed by GitHub
parent eb50cd37ea
commit 01481f2dc1
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
29 changed files with 3185 additions and 2988 deletions
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22
Makefile.pre.in
View file

@ -347,20 +347,36 @@ PEGEN_OBJS= \
Parser/string_parser.o \
Parser/peg_api.o
TOKENIZER_OBJS= \
Parser/lexer/buffer.o \
Parser/lexer/lexer.o \
Parser/lexer/state.o \
Parser/tokenizer/file_tokenizer.o \
Parser/tokenizer/readline_tokenizer.o \
Parser/tokenizer/string_tokenizer.o \
Parser/tokenizer/utf8_tokenizer.o \
Parser/tokenizer/helpers.o
PEGEN_HEADERS= \
$(srcdir)/Include/internal/pycore_parser.h \
$(srcdir)/Parser/pegen.h \
$(srcdir)/Parser/string_parser.h
TOKENIZER_HEADERS= \
Parser/lexer/buffer.h \
Parser/lexer/lexer.h \
Parser/lexer/state.h \
Parser/tokenizer/tokenizer.h \
Parser/tokenizer/helpers.h
POBJS= \
Parser/token.o \
PARSER_OBJS= $(POBJS) $(PEGEN_OBJS) Parser/myreadline.o Parser/tokenizer.o
PARSER_OBJS= $(POBJS) $(PEGEN_OBJS) $(TOKENIZER_OBJS) Parser/myreadline.o
PARSER_HEADERS= \
$(PEGEN_HEADERS) \
$(srcdir)/Parser/tokenizer.h
$(TOKENIZER_HEADERS)
##########################################################################
# Python
@ -1397,6 +1413,8 @@ regen-pegen-metaparser:
.PHONY: regen-pegen
regen-pegen:
@$(MKDIR_P) $(srcdir)/Parser
@$(MKDIR_P) $(srcdir)/Parser/tokenizer
@$(MKDIR_P) $(srcdir)/Parser/lexer
PYTHONPATH=$(srcdir)/Tools/peg_generator $(PYTHON_FOR_REGEN) -m pegen -q c \
$(srcdir)/Grammar/python.gram \
$(srcdir)/Grammar/Tokens \

4
Misc/NEWS.d/next/Core and Builtins/2023-10-11-12-48-03.gh-issue-104169.bPoX8u.rst Normal file
View file

@ -0,0 +1,4 @@
Split the tokenizer into two separate directories:
- One part includes the actual lexeme producing logic and lives in ``Parser/lexer``.
- The second part wraps the lexer according to the different tokenization modes
we have (string, utf-8, file, interactive, readline) and lives in ``Parser/tokenizer``.

9
PCbuild/_freeze_module.vcxproj
View file

@ -172,7 +172,14 @@
<ClCompile Include="..\Parser\action_helpers.c" />
<ClCompile Include="..\Parser\string_parser.c" />
<ClCompile Include="..\Parser\token.c" />
<ClCompile Include="..\Parser\tokenizer.c" />
<ClCompile Include="..\Parser\lexer\buffer.c" />
<ClCompile Include="..\Parser\lexer\state.c" />
<ClCompile Include="..\Parser\lexer\lexer.c" />
<ClCompile Include="..\Parser\tokenizer\string_tokenizer.c" />
<ClCompile Include="..\Parser\tokenizer\file_tokenizer.c" />
<ClCompile Include="..\Parser\tokenizer\utf8_tokenizer.c" />
<ClCompile Include="..\Parser\tokenizer\readline_tokenizer.c" />
<ClCompile Include="..\Parser\tokenizer\helpers.c" />
<ClCompile Include="..\PC\invalid_parameter_handler.c" />
<ClCompile Include="..\PC\msvcrtmodule.c" />
<ClCompile Include="..\PC\winreg.c" />

23
PCbuild/_freeze_module.vcxproj.filters
View file

@ -397,7 +397,28 @@
<ClCompile Include="..\Parser\token.c">
<Filter>Source Files</Filter>
</ClCompile>
<ClCompile Include="..\Parser\tokenizer.c">
<ClCompile Include="..\Parser\lexer\lexer.c">
<Filter>Source Files</Filter>
</ClCompile>
<ClCompile Include="..\Parser\lexer\buffer.c">
<Filter>Source Files</Filter>
</ClCompile>
<ClCompile Include="..\Parser\lexer\state.c">
<Filter>Source Files</Filter>
</ClCompile>
<ClCompile Include="..\Parser\tokenizer\string_tokenizer.c">
<Filter>Source Files</Filter>
</ClCompile>
<ClCompile Include="..\Parser\tokenizer\utf8_tokenizer.c">
<Filter>Source Files</Filter>
</ClCompile>
<ClCompile Include="..\Parser\tokenizer\file_tokenizer.c">
<Filter>Source Files</Filter>
</ClCompile>
<ClCompile Include="..\Parser\tokenizer\readline_tokenizer.c">
<Filter>Source Files</Filter>
</ClCompile>
<ClCompile Include="..\Parser\tokenizer\helpers.c">
<Filter>Source Files</Filter>
</ClCompile>
<ClCompile Include="..\Python\traceback.c">

15
PCbuild/pythoncore.vcxproj
View file

@ -362,7 +362,11 @@
<ClInclude Include="..\Objects\stringlib\replace.h" />
<ClInclude Include="..\Objects\stringlib\split.h" />
<ClInclude Include="..\Objects\unicodetype_db.h" />
<ClInclude Include="..\Parser\tokenizer.h" />
<ClInclude Include="..\Parser\lexer\state.h" />
<ClInclude Include="..\Parser\lexer\lexer.h" />
<ClInclude Include="..\Parser\lexer\buffer.h" />
<ClInclude Include="..\Parser\tokenizer\helpers.h" />
<ClInclude Include="..\Parser\tokenizer\tokenizer.h" />
<ClInclude Include="..\Parser\string_parser.h" />
<ClInclude Include="..\Parser\pegen.h" />
<ClInclude Include="..\PC\errmap.h" />
@ -507,7 +511,14 @@
<ClCompile Include="..\Objects\unionobject.c" />
<ClCompile Include="..\Objects\weakrefobject.c" />
<ClCompile Include="..\Parser\myreadline.c" />
<ClCompile Include="..\Parser\tokenizer.c" />
<ClCompile Include="..\Parser\lexer\state.c" />
<ClCompile Include="..\Parser\lexer\lexer.c" />
<ClCompile Include="..\Parser\lexer\buffer.c" />
<ClCompile Include="..\Parser\tokenizer\string_tokenizer.c" />
<ClCompile Include="..\Parser\tokenizer\file_tokenizer.c" />
<ClCompile Include="..\Parser\tokenizer\utf8_tokenizer.c" />
<ClCompile Include="..\Parser\tokenizer\readline_tokenizer.c" />
<ClCompile Include="..\Parser\tokenizer\helpers.c" />
<ClCompile Include="..\Parser\token.c" />
<ClCompile Include="..\Parser\pegen.c" />
<ClCompile Include="..\Parser\pegen_errors.c" />

37
PCbuild/pythoncore.vcxproj.filters
View file

@ -291,7 +291,19 @@
<ClInclude Include="..\Objects\unicodetype_db.h">
<Filter>Objects</Filter>
</ClInclude>
<ClInclude Include="..\Parser\tokenizer.h">
<ClInclude Include="..\Parser\lexer\lexer.h">
<Filter>Parser</Filter>
</ClInclude>
<ClInclude Include="..\Parser\lexer\state.h">
<Filter>Parser</Filter>
</ClInclude>
<ClInclude Include="..\Parser\lexer\buffer.h">
<Filter>Parser</Filter>
</ClInclude>
<ClInclude Include="..\Parser\tokenizer\tokenizer.h">
<Filter>Parser</Filter>
</ClInclude>
<ClInclude Include="..\Parser\tokenizer\helpers.h">
<Filter>Parser</Filter>
</ClInclude>
<ClInclude Include="..\PC\errmap.h">
@ -1139,7 +1151,28 @@
<ClCompile Include="..\Parser\myreadline.c">
<Filter>Parser</Filter>
</ClCompile>
<ClCompile Include="..\Parser\tokenizer.c">
<ClCompile Include="..\Parser\lexer\lexer.c">
<Filter>Parser</Filter>
</ClCompile>
<ClCompile Include="..\Parser\lexer\state.c">
<Filter>Parser</Filter>
</ClCompile>
<ClCompile Include="..\Parser\lexer\buffer.c">
<Filter>Parser</Filter>
</ClCompile>
<ClCompile Include="..\Parser\tokenizer\string_tokenizer.c">
<Filter>Parser</Filter>
</ClCompile>
<ClCompile Include="..\Parser\tokenizer\file_tokenizer.c">
<Filter>Parser</Filter>
</ClCompile>
<ClCompile Include="..\Parser\tokenizer\utf8_tokenizer.c">
<Filter>Parser</Filter>
</ClCompile>
<ClCompile Include="..\Parser\tokenizer\readline_tokenizer.c">
<Filter>Parser</Filter>
</ClCompile>
<ClCompile Include="..\Parser\tokenizer\helpers.c">
<Filter>Parser</Filter>
</ClCompile>
<ClCompile Include="..\Parser\token.c">

1
Parser/action_helpers.c
View file

@ -1,7 +1,6 @@
#include <Python.h>
#include "pegen.h"
#include "tokenizer.h"
#include "string_parser.h"
#include "pycore_runtime.h" // _PyRuntime

76
Parser/lexer/buffer.c Normal file
View file

@ -0,0 +1,76 @@
#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;
}

10
Parser/lexer/buffer.h Normal file
View file

@ -0,0 +1,10 @@
#ifndef _LEXER_BUFFER_H_
#define _LEXER_BUFFER_H_
#include "pyport.h"
void _PyLexer_remember_fstring_buffers(struct tok_state *tok);
void _PyLexer_restore_fstring_buffers(struct tok_state *tok);
int _PyLexer_tok_reserve_buf(struct tok_state *tok, Py_ssize_t size);
#endif

1419
Parser/lexer/lexer.c Normal file
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File diff suppressed because it is too large Load diff

10
Parser/lexer/lexer.h Normal file
View file

@ -0,0 +1,10 @@
#ifndef _PY_LEXER_LEXER_H_
#define _PY_LEXER_LEXER_H_
#include "state.h"
int _PyLexer_update_fstring_expr(struct tok_state *tok, char cur);
int _PyTokenizer_Get(struct tok_state *, struct token *);
#endif

149
Parser/lexer/state.c Normal file
View file

@ -0,0 +1,149 @@
#include "Python.h"
#include "pycore_pystate.h"
#include "pycore_token.h"
#include "errcode.h"
#include "state.h"
/* Never change this */
#define TABSIZE 8
/* Create and initialize a new tok_state structure */
struct tok_state *
_PyTokenizer_tok_new(void)
{
struct tok_state *tok = (struct tok_state *)PyMem_Malloc(
sizeof(struct tok_state));
if (tok == NULL)
return NULL;
tok->buf = tok->cur = tok->inp = NULL;
tok->fp_interactive = 0;
tok->interactive_src_start = NULL;
tok->interactive_src_end = NULL;
tok->start = NULL;
tok->end = NULL;
tok->done = E_OK;
tok->fp = NULL;
tok->input = NULL;
tok->tabsize = TABSIZE;
tok->indent = 0;
tok->indstack[0] = 0;
tok->atbol = 1;
tok->pendin = 0;
tok->prompt = tok->nextprompt = NULL;
tok->lineno = 0;
tok->starting_col_offset = -1;
tok->col_offset = -1;
tok->level = 0;
tok->altindstack[0] = 0;
tok->decoding_state = STATE_INIT;
tok->decoding_erred = 0;
tok->enc = NULL;
tok->encoding = NULL;
tok->cont_line = 0;
tok->filename = NULL;
tok->decoding_readline = NULL;
tok->decoding_buffer = NULL;
tok->readline = NULL;
tok->type_comments = 0;
tok->interactive_underflow = IUNDERFLOW_NORMAL;
tok->underflow = NULL;
tok->str = NULL;
tok->report_warnings = 1;
tok->tok_extra_tokens = 0;
tok->comment_newline = 0;
tok->implicit_newline = 0;
tok->tok_mode_stack[0] = (tokenizer_mode){.kind =TOK_REGULAR_MODE, .f_string_quote='\0', .f_string_quote_size = 0, .f_string_debug=0};
tok->tok_mode_stack_index = 0;
#ifdef Py_DEBUG
tok->debug = _Py_GetConfig()->parser_debug;
#endif
return tok;
}
static void
free_fstring_expressions(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]);
if (mode->last_expr_buffer != NULL) {
PyMem_Free(mode->last_expr_buffer);
mode->last_expr_buffer = NULL;
mode->last_expr_size = 0;
mode->last_expr_end = -1;
}
}
}
/* Free a tok_state structure */
void
_PyTokenizer_Free(struct tok_state *tok)
{
if (tok->encoding != NULL) {
PyMem_Free(tok->encoding);
}
Py_XDECREF(tok->decoding_readline);
Py_XDECREF(tok->decoding_buffer);
Py_XDECREF(tok->readline);
Py_XDECREF(tok->filename);
if ((tok->readline != NULL || tok->fp != NULL ) && tok->buf != NULL) {
PyMem_Free(tok->buf);
}
if (tok->input) {
PyMem_Free(tok->input);
}
if (tok->interactive_src_start != NULL) {
PyMem_Free(tok->interactive_src_start);
}
free_fstring_expressions(tok);
PyMem_Free(tok);
}
void
_PyToken_Free(struct token *token) {
Py_XDECREF(token->metadata);
}
void
_PyToken_Init(struct token *token) {
token->metadata = NULL;
}
int
_PyLexer_type_comment_token_setup(struct tok_state *tok, struct token *token, int type, int col_offset,
int end_col_offset, const char *start, const char *end)
{
token->level = tok->level;
token->lineno = token->end_lineno = tok->lineno;
token->col_offset = col_offset;
token->end_col_offset = end_col_offset;
token->start = start;
token->end = end;
return type;
}
int
_PyLexer_token_setup(struct tok_state *tok, struct token *token, int type, const char *start, const char *end)
{
assert((start == NULL && end == NULL) || (start != NULL && end != NULL));
token->level = tok->level;
if (ISSTRINGLIT(type)) {
token->lineno = tok->first_lineno;
}
else {
token->lineno = tok->lineno;
}
token->end_lineno = tok->lineno;
token->col_offset = token->end_col_offset = -1;
token->start = start;
token->end = end;
if (start != NULL && end != NULL) {
token->col_offset = tok->starting_col_offset;
token->end_col_offset = tok->col_offset;
}
return type;
}

37
Parser/tokenizer.h → Parser/lexer/state.h
View file

@ -1,19 +1,15 @@
#ifndef Py_TOKENIZER_H
#define Py_TOKENIZER_H
#ifdef __cplusplus
extern "C" {
#endif
#ifndef _PY_LEXER_H_
#define _PY_LEXER_H_
#include "object.h"
/* Tokenizer interface */
#include "pycore_token.h" /* For token types */
#define MAXINDENT 100 /* Max indentation level */
#define MAXLEVEL 200 /* Max parentheses level */
#define MAXFSTRINGLEVEL 150 /* Max f-string nesting level */
#define INSIDE_FSTRING(tok) (tok->tok_mode_stack_index > 0)
#define INSIDE_FSTRING_EXPR(tok) (tok->curly_bracket_expr_start_depth >= 0)
enum decoding_state {
STATE_INIT,
STATE_SEEK_CODING,
@ -118,6 +114,8 @@ struct tok_state {
/* How to proceed when asked for a new token in interactive mode */
enum interactive_underflow_t interactive_underflow;
int (*underflow)(struct tok_state *); /* Function to call when buffer is empty and we need to refill it*/
int report_warnings;
// TODO: Factor this into its own thing
tokenizer_mode tok_mode_stack[MAXFSTRINGLEVEL];
@ -130,19 +128,14 @@ struct tok_state {
#endif
};
extern struct tok_state *_PyTokenizer_FromString(const char *, int, int);
extern struct tok_state *_PyTokenizer_FromUTF8(const char *, int, int);
extern struct tok_state *_PyTokenizer_FromReadline(PyObject*, const char*, int, 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 *);
int _PyLexer_type_comment_token_setup(struct tok_state *tok, struct token *token, int type, int col_offset,
int end_col_offset, const char *start, const char *end);
int _PyLexer_token_setup(struct tok_state *tok, struct token *token, int type, const char *start, const char *end);
struct tok_state *_PyTokenizer_tok_new(void);
void _PyTokenizer_Free(struct tok_state *);
void _PyToken_Free(struct token *);
void _PyToken_Init(struct token *);
#define tok_dump _Py_tok_dump
#ifdef __cplusplus
}
#endif
#endif /* !Py_TOKENIZER_H */

1
Parser/peg_api.c
View file

@ -1,6 +1,5 @@
#include "Python.h"
#include "tokenizer.h"
#include "pegen.h"
mod_ty

3
Parser/pegen.c
View file

@ -3,7 +3,8 @@
#include "pycore_pystate.h" // _PyThreadState_GET()
#include <errcode.h>
#include "tokenizer.h"
#include "lexer/lexer.h"
#include "tokenizer/tokenizer.h"
#include "pegen.h"
// Internal parser functions

3
Parser/pegen_errors.c
View file

@ -2,7 +2,8 @@
#include <errcode.h>
#include "pycore_pyerrors.h" // _PyErr_ProgramDecodedTextObject()
#include "tokenizer.h"
#include "lexer/state.h"
#include "lexer/lexer.h"
#include "pegen.h"
// TOKENIZER ERRORS

2
Parser/string_parser.c
View file

@ -4,7 +4,7 @@
#include "pycore_bytesobject.h" // _PyBytes_DecodeEscape()
#include "pycore_unicodeobject.h" // _PyUnicode_DecodeUnicodeEscapeInternal()
#include "tokenizer.h"
#include "lexer/state.h"
#include "pegen.h"
#include "string_parser.h"

2951
Parser/tokenizer.c
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File diff suppressed because it is too large Load diff

470
Parser/tokenizer/file_tokenizer.c Normal file
View file

@ -0,0 +1,470 @@
#ifdef HAVE_UNISTD_H
# include <unistd.h> // read()
#endif
#include "Python.h"
#include "pycore_call.h"
#include "pycore_import.h"
#include "pycore_fileutils.h"
#include "errcode.h"
#include "helpers.h"
#include "../lexer/state.h"
#include "../lexer/lexer.h"
#include "../lexer/buffer.h"
static int
tok_concatenate_interactive_new_line(struct tok_state *tok, const char *line) {
assert(tok->fp_interactive);
if (!line) {
return 0;
}
Py_ssize_t current_size = tok->interactive_src_end - tok->interactive_src_start;
Py_ssize_t line_size = strlen(line);
char last_char = line[line_size > 0 ? line_size - 1 : line_size];
if (last_char != '\n') {
line_size += 1;
}
char* new_str = tok->interactive_src_start;
new_str = PyMem_Realloc(new_str, current_size + line_size + 1);
if (!new_str) {
if (tok->interactive_src_start) {
PyMem_Free(tok->interactive_src_start);
}
tok->interactive_src_start = NULL;
tok->interactive_src_end = NULL;
tok->done = E_NOMEM;
return -1;
}
strcpy(new_str + current_size, line);
tok->implicit_newline = 0;
if (last_char != '\n') {
/* Last line does not end in \n, fake one */
new_str[current_size + line_size - 1] = '\n';
new_str[current_size + line_size] = '\0';
tok->implicit_newline = 1;
}
tok->interactive_src_start = new_str;
tok->interactive_src_end = new_str + current_size + line_size;
return 0;
}
static int
tok_readline_raw(struct tok_state *tok)
{
do {
if (!_PyLexer_tok_reserve_buf(tok, BUFSIZ)) {
return 0;
}
int n_chars = (int)(tok->end - tok->inp);
size_t line_size = 0;
char *line = _Py_UniversalNewlineFgetsWithSize(tok->inp, n_chars, tok->fp, NULL, &line_size);
if (line == NULL) {
return 1;
}
if (tok->fp_interactive &&
tok_concatenate_interactive_new_line(tok, line) == -1) {
return 0;
}
tok->inp += line_size;
if (tok->inp == tok->buf) {
return 0;
}
} while (tok->inp[-1] != '\n');
return 1;
}
static int
tok_readline_recode(struct tok_state *tok) {
PyObject *line;
const char *buf;
Py_ssize_t buflen;
line = tok->decoding_buffer;
if (line == NULL) {
line = PyObject_CallNoArgs(tok->decoding_readline);
if (line == NULL) {
_PyTokenizer_error_ret(tok);
goto error;
}
}
else {
tok->decoding_buffer = NULL;
}
buf = PyUnicode_AsUTF8AndSize(line, &buflen);
if (buf == NULL) {
_PyTokenizer_error_ret(tok);
goto error;
}
// Make room for the null terminator *and* potentially
// an extra newline character that we may need to artificially
// add.
size_t buffer_size = buflen + 2;
if (!_PyLexer_tok_reserve_buf(tok, buffer_size)) {
goto error;
}
memcpy(tok->inp, buf, buflen);
tok->inp += buflen;
*tok->inp = '\0';
if (tok->fp_interactive &&
tok_concatenate_interactive_new_line(tok, buf) == -1) {
goto error;
}
Py_DECREF(line);
return 1;
error:
Py_XDECREF(line);
return 0;
}
/* Fetch the next byte from TOK. */
static int fp_getc(struct tok_state *tok) {
return getc(tok->fp);
}
/* Unfetch the last byte back into TOK. */
static void fp_ungetc(int c, struct tok_state *tok) {
ungetc(c, tok->fp);
}
/* Set the readline function for TOK to a StreamReader's
readline function. The StreamReader is named ENC.
This function is called from _PyTokenizer_check_bom and _PyTokenizer_check_coding_spec.
ENC is usually identical to the future value of tok->encoding,
except for the (currently unsupported) case of UTF-16.
Return 1 on success, 0 on failure. */
static int
fp_setreadl(struct tok_state *tok, const char* enc)
{
PyObject *readline, *open, *stream;
int fd;
long pos;
fd = fileno(tok->fp);
/* Due to buffering the file offset for fd can be different from the file
* position of tok->fp. If tok->fp was opened in text mode on Windows,
* its file position counts CRLF as one char and can't be directly mapped
* to the file offset for fd. Instead we step back one byte and read to
* the end of line.*/
pos = ftell(tok->fp);
if (pos == -1 ||
lseek(fd, (off_t)(pos > 0 ? pos - 1 : pos), SEEK_SET) == (off_t)-1) {
PyErr_SetFromErrnoWithFilename(PyExc_OSError, NULL);
return 0;
}
open = _PyImport_GetModuleAttrString("io", "open");
if (open == NULL) {
return 0;
}
stream = PyObject_CallFunction(open, "isisOOO",
fd, "r", -1, enc, Py_None, Py_None, Py_False);
Py_DECREF(open);
if (stream == NULL) {
return 0;
}
readline = PyObject_GetAttr(stream, &_Py_ID(readline));
Py_DECREF(stream);
if (readline == NULL) {
return 0;
}
Py_XSETREF(tok->decoding_readline, readline);
if (pos > 0) {
PyObject *bufobj = _PyObject_CallNoArgs(readline);
if (bufobj == NULL) {
return 0;
}
Py_DECREF(bufobj);
}
return 1;
}
static int
tok_underflow_interactive(struct tok_state *tok) {
if (tok->interactive_underflow == IUNDERFLOW_STOP) {
tok->done = E_INTERACT_STOP;
return 1;
}
char *newtok = PyOS_Readline(tok->fp ? tok->fp : stdin, stdout, tok->prompt);
if (newtok != NULL) {
char *translated = _PyTokenizer_translate_newlines(newtok, 0, 0, tok);
PyMem_Free(newtok);
if (translated == NULL) {
return 0;
}
newtok = translated;
}
if (tok->encoding && newtok && *newtok) {
/* Recode to UTF-8 */
Py_ssize_t buflen;
const char* buf;
PyObject *u = _PyTokenizer_translate_into_utf8(newtok, tok->encoding);
PyMem_Free(newtok);
if (u == NULL) {
tok->done = E_DECODE;
return 0;
}
buflen = PyBytes_GET_SIZE(u);
buf = PyBytes_AS_STRING(u);
newtok = PyMem_Malloc(buflen+1);
if (newtok == NULL) {
Py_DECREF(u);
tok->done = E_NOMEM;
return 0;
}
strcpy(newtok, buf);
Py_DECREF(u);
}
if (tok->fp_interactive &&
tok_concatenate_interactive_new_line(tok, newtok) == -1) {
PyMem_Free(newtok);
return 0;
}
if (tok->nextprompt != NULL) {
tok->prompt = tok->nextprompt;
}
if (newtok == NULL) {
tok->done = E_INTR;
}
else if (*newtok == '\0') {
PyMem_Free(newtok);
tok->done = E_EOF;
}
else if (tok->start != NULL) {
Py_ssize_t cur_multi_line_start = tok->multi_line_start - tok->buf;
_PyLexer_remember_fstring_buffers(tok);
size_t size = strlen(newtok);
ADVANCE_LINENO();
if (!_PyLexer_tok_reserve_buf(tok, size + 1)) {
PyMem_Free(tok->buf);
tok->buf = NULL;
PyMem_Free(newtok);
return 0;
}
memcpy(tok->cur, newtok, size + 1);
PyMem_Free(newtok);
tok->inp += size;
tok->multi_line_start = tok->buf + cur_multi_line_start;
_PyLexer_restore_fstring_buffers(tok);
}
else {
_PyLexer_remember_fstring_buffers(tok);
ADVANCE_LINENO();
PyMem_Free(tok->buf);
tok->buf = newtok;
tok->cur = tok->buf;
tok->line_start = tok->buf;
tok->inp = strchr(tok->buf, '\0');
tok->end = tok->inp + 1;
_PyLexer_restore_fstring_buffers(tok);
}
if (tok->done != E_OK) {
if (tok->prompt != NULL) {
PySys_WriteStderr("\n");
}
return 0;
}
if (tok->tok_mode_stack_index && !_PyLexer_update_fstring_expr(tok, 0)) {
return 0;
}
return 1;
}
static int
tok_underflow_file(struct tok_state *tok) {
if (tok->start == NULL && !INSIDE_FSTRING(tok)) {
tok->cur = tok->inp = tok->buf;
}
if (tok->decoding_state == STATE_INIT) {
/* We have not yet determined the encoding.
If an encoding is found, use the file-pointer
reader functions from now on. */
if (!_PyTokenizer_check_bom(fp_getc, fp_ungetc, fp_setreadl, tok)) {
_PyTokenizer_error_ret(tok);
return 0;
}
assert(tok->decoding_state != STATE_INIT);
}
/* Read until '\n' or EOF */
if (tok->decoding_readline != NULL) {
/* We already have a codec associated with this input. */
if (!tok_readline_recode(tok)) {
return 0;
}
}
else {
/* We want a 'raw' read. */
if (!tok_readline_raw(tok)) {
return 0;
}
}
if (tok->inp == tok->cur) {
tok->done = E_EOF;
return 0;
}
tok->implicit_newline = 0;
if (tok->inp[-1] != '\n') {
assert(tok->inp + 1 < tok->end);
/* Last line does not end in \n, fake one */
*tok->inp++ = '\n';
*tok->inp = '\0';
tok->implicit_newline = 1;
}
if (tok->tok_mode_stack_index && !_PyLexer_update_fstring_expr(tok, 0)) {
return 0;
}
ADVANCE_LINENO();
if (tok->decoding_state != STATE_NORMAL) {
if (tok->lineno > 2) {
tok->decoding_state = STATE_NORMAL;
}
else if (!_PyTokenizer_check_coding_spec(tok->cur, strlen(tok->cur),
tok, fp_setreadl))
{
return 0;
}
}
/* The default encoding is UTF-8, so make sure we don't have any
non-UTF-8 sequences in it. */
if (!tok->encoding && !_PyTokenizer_ensure_utf8(tok->cur, tok)) {
_PyTokenizer_error_ret(tok);
return 0;
}
assert(tok->done == E_OK);
return tok->done == E_OK;
}
/* Set up tokenizer for file */
struct tok_state *
_PyTokenizer_FromFile(FILE *fp, const char* enc,
const char *ps1, const char *ps2)
{
struct tok_state *tok = _PyTokenizer_tok_new();
if (tok == NULL)
return NULL;
if ((tok->buf = (char *)PyMem_Malloc(BUFSIZ)) == NULL) {
_PyTokenizer_Free(tok);
return NULL;
}
tok->cur = tok->inp = tok->buf;
tok->end = tok->buf + BUFSIZ;
tok->fp = fp;
tok->prompt = ps1;
tok->nextprompt = ps2;
if (ps1 || ps2) {
tok->underflow = &tok_underflow_interactive;
} else {
tok->underflow = &tok_underflow_file;
}
if (enc != NULL) {
/* Must copy encoding declaration since it
gets copied into the parse tree. */
tok->encoding = _PyTokenizer_new_string(enc, strlen(enc), tok);
if (!tok->encoding) {
_PyTokenizer_Free(tok);
return NULL;
}
tok->decoding_state = STATE_NORMAL;
}
return tok;
}
#if defined(__wasi__) || (defined(__EMSCRIPTEN__) && (__EMSCRIPTEN_major__ >= 3))
// fdopen() with borrowed fd. WASI does not provide dup() and Emscripten's
// dup() emulation with open() is slow.
typedef union {
void *cookie;
int fd;
} borrowed;
static ssize_t
borrow_read(void *cookie, char *buf, size_t size)
{
borrowed b = {.cookie = cookie};
return read(b.fd, (void *)buf, size);
}
static FILE *
fdopen_borrow(int fd) {
// supports only reading. seek fails. close and write are no-ops.
cookie_io_functions_t io_cb = {borrow_read, NULL, NULL, NULL};
borrowed b = {.fd = fd};
return fopencookie(b.cookie, "r", io_cb);
}
#else
static FILE *
fdopen_borrow(int fd) {
fd = _Py_dup(fd);
if (fd < 0) {
return NULL;
}
return fdopen(fd, "r");
}
#endif
/* Get the encoding of a Python file. Check for the coding cookie and check if
the file starts with a BOM.
_PyTokenizer_FindEncodingFilename() returns NULL when it can't find the
encoding in the first or second line of the file (in which case the encoding
should be assumed to be UTF-8).
The char* returned is malloc'ed via PyMem_Malloc() and thus must be freed
by the caller. */
char *
_PyTokenizer_FindEncodingFilename(int fd, PyObject *filename)
{
struct tok_state *tok;
FILE *fp;
char *encoding = NULL;
fp = fdopen_borrow(fd);
if (fp == NULL) {
return NULL;
}
tok = _PyTokenizer_FromFile(fp, NULL, NULL, NULL);
if (tok == NULL) {
fclose(fp);
return NULL;
}
if (filename != NULL) {
tok->filename = Py_NewRef(filename);
}
else {
tok->filename = PyUnicode_FromString("<string>");
if (tok->filename == NULL) {
fclose(fp);
_PyTokenizer_Free(tok);
return encoding;
}
}
struct token token;
// We don't want to report warnings here because it could cause infinite recursion
// if fetching the encoding shows a warning.
tok->report_warnings = 0;
while (tok->lineno < 2 && tok->done == E_OK) {
_PyToken_Init(&token);
_PyTokenizer_Get(tok, &token);
_PyToken_Free(&token);
}
fclose(fp);
if (tok->encoding) {
encoding = (char *)PyMem_Malloc(strlen(tok->encoding) + 1);
if (encoding) {
strcpy(encoding, tok->encoding);
}
}
_PyTokenizer_Free(tok);
return encoding;
}

552
Parser/tokenizer/helpers.c Normal file
View file

@ -0,0 +1,552 @@
#include "Python.h"
#include "errcode.h"
#include "pycore_token.h"
#include "../lexer/state.h"
/* ############## ERRORS ############## */
static int
_syntaxerror_range(struct tok_state *tok, const char *format,
int col_offset, int end_col_offset,
va_list vargs)
{
// In release builds, we don't want to overwrite a previous error, but in debug builds we
// want to fail if we are not doing it so we can fix it.
assert(tok->done != E_ERROR);
if (tok->done == E_ERROR) {
return ERRORTOKEN;
}
PyObject *errmsg, *errtext, *args;
errmsg = PyUnicode_FromFormatV(format, vargs);
if (!errmsg) {
goto error;
}
errtext = PyUnicode_DecodeUTF8(tok->line_start, tok->cur - tok->line_start,
"replace");
if (!errtext) {
goto error;
}
if (col_offset == -1) {
col_offset = (int)PyUnicode_GET_LENGTH(errtext);
}
if (end_col_offset == -1) {
end_col_offset = col_offset;
}
Py_ssize_t line_len = strcspn(tok->line_start, "\n");
if (line_len != tok->cur - tok->line_start) {
Py_DECREF(errtext);
errtext = PyUnicode_DecodeUTF8(tok->line_start, line_len,
"replace");
}
if (!errtext) {
goto error;
}
args = Py_BuildValue("(O(OiiNii))", errmsg, tok->filename, tok->lineno,
col_offset, errtext, tok->lineno, end_col_offset);
if (args) {
PyErr_SetObject(PyExc_SyntaxError, args);
Py_DECREF(args);
}
error:
Py_XDECREF(errmsg);
tok->done = E_ERROR;
return ERRORTOKEN;
}
int
_PyTokenizer_syntaxerror(struct tok_state *tok, const char *format, ...)
{
// This errors are cleaned on startup. Todo: Fix it.
va_list vargs;
va_start(vargs, format);
int ret = _syntaxerror_range(tok, format, -1, -1, vargs);
va_end(vargs);
return ret;
}
int
_PyTokenizer_syntaxerror_known_range(struct tok_state *tok,
int col_offset, int end_col_offset,
const char *format, ...)
{
va_list vargs;
va_start(vargs, format);
int ret = _syntaxerror_range(tok, format, col_offset, end_col_offset, vargs);
va_end(vargs);
return ret;
}
int
_PyTokenizer_indenterror(struct tok_state *tok)
{
tok->done = E_TABSPACE;
tok->cur = tok->inp;
return ERRORTOKEN;
}
char *
_PyTokenizer_error_ret(struct tok_state *tok) /* XXX */
{
tok->decoding_erred = 1;
if ((tok->fp != NULL || tok->readline != NULL) && tok->buf != NULL) {/* see _PyTokenizer_Free */
PyMem_Free(tok->buf);
}
tok->buf = tok->cur = tok->inp = NULL;
tok->start = NULL;
tok->end = NULL;
tok->done = E_DECODE;
return NULL; /* as if it were EOF */
}
int
_PyTokenizer_warn_invalid_escape_sequence(struct tok_state *tok, int first_invalid_escape_char)
{
if (!tok->report_warnings) {
return 0;
}
PyObject *msg = PyUnicode_FromFormat(
"invalid escape sequence '\\%c'",
(char) first_invalid_escape_char
);
if (msg == NULL) {
return -1;
}
if (PyErr_WarnExplicitObject(PyExc_SyntaxWarning, msg, tok->filename,
tok->lineno, NULL, NULL) < 0) {
Py_DECREF(msg);
if (PyErr_ExceptionMatches(PyExc_SyntaxWarning)) {
/* Replace the SyntaxWarning exception with a SyntaxError
to get a more accurate error report */
PyErr_Clear();
return _PyTokenizer_syntaxerror(tok, "invalid escape sequence '\\%c'", (char) first_invalid_escape_char);
}
return -1;
}
Py_DECREF(msg);
return 0;
}
int
_PyTokenizer_parser_warn(struct tok_state *tok, PyObject *category, const char *format, ...)
{
if (!tok->report_warnings) {
return 0;
}
PyObject *errmsg;
va_list vargs;
va_start(vargs, format);
errmsg = PyUnicode_FromFormatV(format, vargs);
va_end(vargs);
if (!errmsg) {
goto error;
}
if (PyErr_WarnExplicitObject(category, errmsg, tok->filename,
tok->lineno, NULL, NULL) < 0) {
if (PyErr_ExceptionMatches(category)) {
/* Replace the DeprecationWarning exception with a SyntaxError
to get a more accurate error report */
PyErr_Clear();
_PyTokenizer_syntaxerror(tok, "%U", errmsg);
}
goto error;
}
Py_DECREF(errmsg);
return 0;
error:
Py_XDECREF(errmsg);
tok->done = E_ERROR;
return -1;
}
/* ############## STRING MANIPULATION ############## */
char *
_PyTokenizer_new_string(const char *s, Py_ssize_t len, struct tok_state *tok)
{
char* result = (char *)PyMem_Malloc(len + 1);
if (!result) {
tok->done = E_NOMEM;
return NULL;
}
memcpy(result, s, len);
result[len] = '\0';
return result;
}
PyObject *
_PyTokenizer_translate_into_utf8(const char* str, const char* enc) {
PyObject *utf8;
PyObject* buf = PyUnicode_Decode(str, strlen(str), enc, NULL);
if (buf == NULL)
return NULL;
utf8 = PyUnicode_AsUTF8String(buf);
Py_DECREF(buf);
return utf8;
}
char *
_PyTokenizer_translate_newlines(const char *s, int exec_input, int preserve_crlf,
struct tok_state *tok) {
int skip_next_lf = 0;
size_t needed_length = strlen(s) + 2, final_length;
char *buf, *current;
char c = '\0';
buf = PyMem_Malloc(needed_length);
if (buf == NULL) {
tok->done = E_NOMEM;
return NULL;
}
for (current = buf; *s; s++, current++) {
c = *s;
if (skip_next_lf) {
skip_next_lf = 0;
if (c == '\n') {
c = *++s;
if (!c)
break;
}
}
if (!preserve_crlf && c == '\r') {
skip_next_lf = 1;
c = '\n';
}
*current = c;
}
/* If this is exec input, add a newline to the end of the string if
there isn't one already. */
if (exec_input && c != '\n' && c != '\0') {
*current = '\n';
current++;
}
*current = '\0';
final_length = current - buf + 1;
if (final_length < needed_length && final_length) {
/* should never fail */
char* result = PyMem_Realloc(buf, final_length);
if (result == NULL) {
PyMem_Free(buf);
}
buf = result;
}
return buf;
}
/* ############## ENCODING STUFF ############## */
/* See whether the file starts with a BOM. If it does,
invoke the set_readline function with the new encoding.
Return 1 on success, 0 on failure. */
int
_PyTokenizer_check_bom(int get_char(struct tok_state *),
void unget_char(int, struct tok_state *),
int set_readline(struct tok_state *, const char *),
struct tok_state *tok)
{
int ch1, ch2, ch3;
ch1 = get_char(tok);
tok->decoding_state = STATE_SEEK_CODING;
if (ch1 == EOF) {
return 1;
} else if (ch1 == 0xEF) {
ch2 = get_char(tok);
if (ch2 != 0xBB) {
unget_char(ch2, tok);
unget_char(ch1, tok);
return 1;
}
ch3 = get_char(tok);
if (ch3 != 0xBF) {
unget_char(ch3, tok);
unget_char(ch2, tok);
unget_char(ch1, tok);
return 1;
}
} else {
unget_char(ch1, tok);
return 1;
}
if (tok->encoding != NULL)
PyMem_Free(tok->encoding);
tok->encoding = _PyTokenizer_new_string("utf-8", 5, tok);
if (!tok->encoding)
return 0;
/* No need to set_readline: input is already utf-8 */
return 1;
}
static const char *
get_normal_name(const char *s) /* for utf-8 and latin-1 */
{
char buf[13];
int i;
for (i = 0; i < 12; i++) {
int c = s[i];
if (c == '\0')
break;
else if (c == '_')
buf[i] = '-';
else
buf[i] = Py_TOLOWER(c);
}
buf[i] = '\0';
if (strcmp(buf, "utf-8") == 0 ||
strncmp(buf, "utf-8-", 6) == 0)
return "utf-8";
else if (strcmp(buf, "latin-1") == 0 ||
strcmp(buf, "iso-8859-1") == 0 ||
strcmp(buf, "iso-latin-1") == 0 ||
strncmp(buf, "latin-1-", 8) == 0 ||
strncmp(buf, "iso-8859-1-", 11) == 0 ||
strncmp(buf, "iso-latin-1-", 12) == 0)
return "iso-8859-1";
else
return s;
}
/* Return the coding spec in S, or NULL if none is found. */
static int
get_coding_spec(const char *s, char **spec, Py_ssize_t size, struct tok_state *tok)
{
Py_ssize_t i;
*spec = NULL;
/* Coding spec must be in a comment, and that comment must be
* the only statement on the source code line. */
for (i = 0; i < size - 6; i++) {
if (s[i] == '#')
break;
if (s[i] != ' ' && s[i] != '\t' && s[i] != '\014')
return 1;
}
for (; i < size - 6; i++) { /* XXX inefficient search */
const char* t = s + i;
if (memcmp(t, "coding", 6) == 0) {
const char* begin = NULL;
t += 6;
if (t[0] != ':' && t[0] != '=')
continue;
do {
t++;
} while (t[0] == ' ' || t[0] == '\t');
begin = t;
while (Py_ISALNUM(t[0]) ||
t[0] == '-' || t[0] == '_' || t[0] == '.')
t++;
if (begin < t) {
char* r = _PyTokenizer_new_string(begin, t - begin, tok);
const char* q;
if (!r)
return 0;
q = get_normal_name(r);
if (r != q) {
PyMem_Free(r);
r = _PyTokenizer_new_string(q, strlen(q), tok);
if (!r)
return 0;
}
*spec = r;
break;
}
}
}
return 1;
}
/* Check whether the line contains a coding spec. If it does,
invoke the set_readline function for the new encoding.
This function receives the tok_state and the new encoding.
Return 1 on success, 0 on failure. */
int
_PyTokenizer_check_coding_spec(const char* line, Py_ssize_t size, struct tok_state *tok,
int set_readline(struct tok_state *, const char *))
{
char *cs;
if (tok->cont_line) {
/* It's a continuation line, so it can't be a coding spec. */
tok->decoding_state = STATE_NORMAL;
return 1;
}
if (!get_coding_spec(line, &cs, size, tok)) {
return 0;
}
if (!cs) {
Py_ssize_t i;
for (i = 0; i < size; i++) {
if (line[i] == '#' || line[i] == '\n' || line[i] == '\r')
break;
if (line[i] != ' ' && line[i] != '\t' && line[i] != '\014') {
/* Stop checking coding spec after a line containing
* anything except a comment. */
tok->decoding_state = STATE_NORMAL;
break;
}
}
return 1;
}
tok->decoding_state = STATE_NORMAL;
if (tok->encoding == NULL) {
assert(tok->decoding_readline == NULL);
if (strcmp(cs, "utf-8") != 0 && !set_readline(tok, cs)) {
_PyTokenizer_error_ret(tok);
PyErr_Format(PyExc_SyntaxError, "encoding problem: %s", cs);
PyMem_Free(cs);
return 0;
}
tok->encoding = cs;
} else { /* then, compare cs with BOM */
if (strcmp(tok->encoding, cs) != 0) {
_PyTokenizer_error_ret(tok);
PyErr_Format(PyExc_SyntaxError,
"encoding problem: %s with BOM", cs);
PyMem_Free(cs);
return 0;
}
PyMem_Free(cs);
}
return 1;
}
/* Check whether the characters at s start a valid
UTF-8 sequence. Return the number of characters forming
the sequence if yes, 0 if not. The special cases match
those in stringlib/codecs.h:utf8_decode.
*/
static int
valid_utf8(const unsigned char* s)
{
int expected = 0;
int length;
if (*s < 0x80) {
/* single-byte code */
return 1;
}
else if (*s < 0xE0) {
/* \xC2\x80-\xDF\xBF -- 0080-07FF */
if (*s < 0xC2) {
/* invalid sequence
\x80-\xBF -- continuation byte
\xC0-\xC1 -- fake 0000-007F */
return 0;
}
expected = 1;
}
else if (*s < 0xF0) {
/* \xE0\xA0\x80-\xEF\xBF\xBF -- 0800-FFFF */
if (*s == 0xE0 && *(s + 1) < 0xA0) {
/* invalid sequence
\xE0\x80\x80-\xE0\x9F\xBF -- fake 0000-0800 */
return 0;
}
else if (*s == 0xED && *(s + 1) >= 0xA0) {
/* Decoding UTF-8 sequences in range \xED\xA0\x80-\xED\xBF\xBF
will result in surrogates in range D800-DFFF. Surrogates are
not valid UTF-8 so they are rejected.
See https://www.unicode.org/versions/Unicode5.2.0/ch03.pdf
(table 3-7) and http://www.rfc-editor.org/rfc/rfc3629.txt */
return 0;
}
expected = 2;
}
else if (*s < 0xF5) {
/* \xF0\x90\x80\x80-\xF4\x8F\xBF\xBF -- 10000-10FFFF */
if (*(s + 1) < 0x90 ? *s == 0xF0 : *s == 0xF4) {
/* invalid sequence -- one of:
\xF0\x80\x80\x80-\xF0\x8F\xBF\xBF -- fake 0000-FFFF
\xF4\x90\x80\x80- -- 110000- overflow */
return 0;
}
expected = 3;
}
else {
/* invalid start byte */
return 0;
}
length = expected + 1;
for (; expected; expected--)
if (s[expected] < 0x80 || s[expected] >= 0xC0)
return 0;
return length;
}
int
_PyTokenizer_ensure_utf8(char *line, struct tok_state *tok)
{
int badchar = 0;
unsigned char *c;
int length;
for (c = (unsigned char *)line; *c; c += length) {
if (!(length = valid_utf8(c))) {
badchar = *c;
break;
}
}
if (badchar) {
PyErr_Format(PyExc_SyntaxError,
"Non-UTF-8 code starting with '\\x%.2x' "
"in file %U on line %i, "
"but no encoding declared; "
"see https://peps.python.org/pep-0263/ for details",
badchar, tok->filename, tok->lineno);
return 0;
}
return 1;
}
/* ############## DEBUGGING STUFF ############## */
#ifdef Py_DEBUG
void
_PyTokenizer_print_escape(FILE *f, const char *s, Py_ssize_t size)
{
if (s == NULL) {
fputs("NULL", f);
return;
}
putc('"', f);
while (size-- > 0) {
unsigned char c = *s++;
switch (c) {
case '\n': fputs("\\n", f); break;
case '\r': fputs("\\r", f); break;
case '\t': fputs("\\t", f); break;
case '\f': fputs("\\f", f); break;
case '\'': fputs("\\'", f); break;
case '"': fputs("\\\"", f); break;
default:
if (0x20 <= c && c <= 0x7f)
putc(c, f);
else
fprintf(f, "\\x%02x", c);
}
}
putc('"', f);
}
void
_PyTokenizer_tok_dump(int type, char *start, char *end)
{
fprintf(stderr, "%s", _PyParser_TokenNames[type]);
if (type == NAME || type == NUMBER || type == STRING || type == OP)
fprintf(stderr, "(%.*s)", (int)(end - start), start);
}
#endif

37
Parser/tokenizer/helpers.h Normal file
View file

@ -0,0 +1,37 @@
#ifndef _PY_TOKENIZER_HELPERS_H_
#define _PY_TOKENIZER_HELPERS_H_
#include "Python.h"
#include "../lexer/state.h"
#define ADVANCE_LINENO() \
tok->lineno++; \
tok->col_offset = 0;
int _PyTokenizer_syntaxerror(struct tok_state *tok, const char *format, ...);
int _PyTokenizer_syntaxerror_known_range(struct tok_state *tok, int col_offset, int end_col_offset, const char *format, ...);
int _PyTokenizer_indenterror(struct tok_state *tok);
int _PyTokenizer_warn_invalid_escape_sequence(struct tok_state *tok, int first_invalid_escape_char);
int _PyTokenizer_parser_warn(struct tok_state *tok, PyObject *category, const char *format, ...);
char *_PyTokenizer_error_ret(struct tok_state *tok);
char *_PyTokenizer_new_string(const char *s, Py_ssize_t len, struct tok_state *tok);
char *_PyTokenizer_translate_newlines(const char *s, int exec_input, int preserve_crlf, struct tok_state *tok);
PyObject *_PyTokenizer_translate_into_utf8(const char* str, const char* enc);
int _PyTokenizer_check_bom(int get_char(struct tok_state *),
void unget_char(int, struct tok_state *),
int set_readline(struct tok_state *, const char *),
struct tok_state *tok);
int _PyTokenizer_check_coding_spec(const char* line, Py_ssize_t size, struct tok_state *tok,
int set_readline(struct tok_state *, const char *));
int _PyTokenizer_ensure_utf8(char *line, struct tok_state *tok);
#ifdef Py_DEBUG
void _PyTokenizer_print_escape(FILE *f, const char *s, Py_ssize_t size);
void _PyTokenizer_tok_dump(int type, char *start, char *end);
#endif
#endif

134
Parser/tokenizer/readline_tokenizer.c Normal file
View file

@ -0,0 +1,134 @@
#include "Python.h"
#include "errcode.h"
#include "helpers.h"
#include "../lexer/lexer.h"
#include "../lexer/state.h"
#include "../lexer/buffer.h"
static int
tok_readline_string(struct tok_state* tok) {
PyObject* line = NULL;
PyObject* raw_line = PyObject_CallNoArgs(tok->readline);
if (raw_line == NULL) {
if (PyErr_ExceptionMatches(PyExc_StopIteration)) {
PyErr_Clear();
return 1;
}
_PyTokenizer_error_ret(tok);
goto error;
}
if(tok->encoding != NULL) {
if (!PyBytes_Check(raw_line)) {
PyErr_Format(PyExc_TypeError, "readline() returned a non-bytes object");
_PyTokenizer_error_ret(tok);
goto error;
}
line = PyUnicode_Decode(PyBytes_AS_STRING(raw_line), PyBytes_GET_SIZE(raw_line),
tok->encoding, "replace");
Py_CLEAR(raw_line);
if (line == NULL) {
_PyTokenizer_error_ret(tok);
goto error;
}
} else {
if(!PyUnicode_Check(raw_line)) {
PyErr_Format(PyExc_TypeError, "readline() returned a non-string object");
_PyTokenizer_error_ret(tok);
goto error;
}
line = raw_line;
raw_line = NULL;
}
Py_ssize_t buflen;
const char* buf = PyUnicode_AsUTF8AndSize(line, &buflen);
if (buf == NULL) {
_PyTokenizer_error_ret(tok);
goto error;
}
// Make room for the null terminator *and* potentially
// an extra newline character that we may need to artificially
// add.
size_t buffer_size = buflen + 2;
if (!_PyLexer_tok_reserve_buf(tok, buffer_size)) {
goto error;
}
memcpy(tok->inp, buf, buflen);
tok->inp += buflen;
*tok->inp = '\0';
tok->line_start = tok->cur;
Py_DECREF(line);
return 1;
error:
Py_XDECREF(raw_line);
Py_XDECREF(line);
return 0;
}
static int
tok_underflow_readline(struct tok_state* tok) {
assert(tok->decoding_state == STATE_NORMAL);
assert(tok->fp == NULL && tok->input == NULL && tok->decoding_readline == NULL);
if (tok->start == NULL && !INSIDE_FSTRING(tok)) {
tok->cur = tok->inp = tok->buf;
}
if (!tok_readline_string(tok)) {
return 0;
}
if (tok->inp == tok->cur) {
tok->done = E_EOF;
return 0;
}
tok->implicit_newline = 0;
if (tok->inp[-1] != '\n') {
assert(tok->inp + 1 < tok->end);
/* Last line does not end in \n, fake one */
*tok->inp++ = '\n';
*tok->inp = '\0';
tok->implicit_newline = 1;
}
if (tok->tok_mode_stack_index && !_PyLexer_update_fstring_expr(tok, 0)) {
return 0;
}
ADVANCE_LINENO();
/* The default encoding is UTF-8, so make sure we don't have any
non-UTF-8 sequences in it. */
if (!tok->encoding && !_PyTokenizer_ensure_utf8(tok->cur, tok)) {
_PyTokenizer_error_ret(tok);
return 0;
}
assert(tok->done == E_OK);
return tok->done == E_OK;
}
struct tok_state *
_PyTokenizer_FromReadline(PyObject* readline, const char* enc,
int exec_input, int preserve_crlf)
{
struct tok_state *tok = _PyTokenizer_tok_new();
if (tok == NULL)
return NULL;
if ((tok->buf = (char *)PyMem_Malloc(BUFSIZ)) == NULL) {
_PyTokenizer_Free(tok);
return NULL;
}
tok->cur = tok->inp = tok->buf;
tok->end = tok->buf + BUFSIZ;
tok->fp = NULL;
if (enc != NULL) {
tok->encoding = _PyTokenizer_new_string(enc, strlen(enc), tok);
if (!tok->encoding) {
_PyTokenizer_Free(tok);
return NULL;
}
}
tok->decoding_state = STATE_NORMAL;
tok->underflow = &tok_underflow_readline;
Py_INCREF(readline);
tok->readline = readline;
return tok;
}

129
Parser/tokenizer/string_tokenizer.c Normal file
View file

@ -0,0 +1,129 @@
#include "Python.h"
#include "errcode.h"
#include "helpers.h"
#include "../lexer/state.h"
static int
tok_underflow_string(struct tok_state *tok) {
char *end = strchr(tok->inp, '\n');
if (end != NULL) {
end++;
}
else {
end = strchr(tok->inp, '\0');
if (end == tok->inp) {
tok->done = E_EOF;
return 0;
}
}
if (tok->start == NULL) {
tok->buf = tok->cur;
}
tok->line_start = tok->cur;
ADVANCE_LINENO();
tok->inp = end;
return 1;
}
/* Fetch a byte from TOK, using the string buffer. */
static int
buf_getc(struct tok_state *tok) {
return Py_CHARMASK(*tok->str++);
}
/* Unfetch a byte from TOK, using the string buffer. */
static void
buf_ungetc(int c, struct tok_state *tok) {
tok->str--;
assert(Py_CHARMASK(*tok->str) == c); /* tok->cur may point to read-only segment */
}
/* Set the readline function for TOK to ENC. For the string-based
tokenizer, this means to just record the encoding. */
static int
buf_setreadl(struct tok_state *tok, const char* enc) {
tok->enc = enc;
return 1;
}
/* Decode a byte string STR for use as the buffer of TOK.
Look for encoding declarations inside STR, and record them
inside TOK. */
static char *
decode_str(const char *input, int single, struct tok_state *tok, int preserve_crlf)
{
PyObject* utf8 = NULL;
char *str;
const char *s;
const char *newl[2] = {NULL, NULL};
int lineno = 0;
tok->input = str = _PyTokenizer_translate_newlines(input, single, preserve_crlf, tok);
if (str == NULL)
return NULL;
tok->enc = NULL;
tok->str = str;
if (!_PyTokenizer_check_bom(buf_getc, buf_ungetc, buf_setreadl, tok))
return _PyTokenizer_error_ret(tok);
str = tok->str; /* string after BOM if any */
assert(str);
if (tok->enc != NULL) {
utf8 = _PyTokenizer_translate_into_utf8(str, tok->enc);
if (utf8 == NULL)
return _PyTokenizer_error_ret(tok);
str = PyBytes_AsString(utf8);
}
for (s = str;; s++) {
if (*s == '\0') break;
else if (*s == '\n') {
assert(lineno < 2);
newl[lineno] = s;
lineno++;
if (lineno == 2) break;
}
}
tok->enc = NULL;
/* need to check line 1 and 2 separately since check_coding_spec
assumes a single line as input */
if (newl[0]) {
if (!_PyTokenizer_check_coding_spec(str, newl[0] - str, tok, buf_setreadl)) {
return NULL;
}
if (tok->enc == NULL && tok->decoding_state != STATE_NORMAL && newl[1]) {
if (!_PyTokenizer_check_coding_spec(newl[0]+1, newl[1] - newl[0],
tok, buf_setreadl))
return NULL;
}
}
if (tok->enc != NULL) {
assert(utf8 == NULL);
utf8 = _PyTokenizer_translate_into_utf8(str, tok->enc);
if (utf8 == NULL)
return _PyTokenizer_error_ret(tok);
str = PyBytes_AS_STRING(utf8);
}
assert(tok->decoding_buffer == NULL);
tok->decoding_buffer = utf8; /* CAUTION */
return str;
}
/* Set up tokenizer for string */
struct tok_state *
_PyTokenizer_FromString(const char *str, int exec_input, int preserve_crlf)
{
struct tok_state *tok = _PyTokenizer_tok_new();
char *decoded;
if (tok == NULL)
return NULL;
decoded = decode_str(str, exec_input, tok, preserve_crlf);
if (decoded == NULL) {
_PyTokenizer_Free(tok);
return NULL;
}
tok->buf = tok->cur = tok->inp = decoded;
tok->end = decoded;
tok->underflow = &tok_underflow_string;
return tok;
}

14
Parser/tokenizer/tokenizer.h Normal file
View file

@ -0,0 +1,14 @@
#ifndef Py_TOKENIZER_H
#define Py_TOKENIZER_H
#include "Python.h"
struct tok_state *_PyTokenizer_FromString(const char *, int, int);
struct tok_state *_PyTokenizer_FromUTF8(const char *, int, int);
struct tok_state *_PyTokenizer_FromReadline(PyObject*, const char*, int, int);
struct tok_state *_PyTokenizer_FromFile(FILE *, const char*,
const char *, const char *);
#define tok_dump _Py_tok_dump
#endif /* !Py_TOKENIZER_H */

55
Parser/tokenizer/utf8_tokenizer.c Normal file
View file

@ -0,0 +1,55 @@
#include "Python.h"
#include "errcode.h"
#include "helpers.h"
#include "../lexer/state.h"
static int
tok_underflow_string(struct tok_state *tok) {
char *end = strchr(tok->inp, '\n');
if (end != NULL) {
end++;
}
else {
end = strchr(tok->inp, '\0');
if (end == tok->inp) {
tok->done = E_EOF;
return 0;
}
}
if (tok->start == NULL) {
tok->buf = tok->cur;
}
tok->line_start = tok->cur;
ADVANCE_LINENO();
tok->inp = end;
return 1;
}
/* Set up tokenizer for UTF-8 string */
struct tok_state *
_PyTokenizer_FromUTF8(const char *str, int exec_input, int preserve_crlf)
{
struct tok_state *tok = _PyTokenizer_tok_new();
char *translated;
if (tok == NULL)
return NULL;
tok->input = translated = _PyTokenizer_translate_newlines(str, exec_input, preserve_crlf, tok);
if (translated == NULL) {
_PyTokenizer_Free(tok);
return NULL;
}
tok->decoding_state = STATE_NORMAL;
tok->enc = NULL;
tok->str = translated;
tok->encoding = _PyTokenizer_new_string("utf-8", 5, tok);
if (!tok->encoding) {
_PyTokenizer_Free(tok);
return NULL;
}
tok->buf = tok->cur = tok->inp = translated;
tok->end = translated;
tok->underflow = &tok_underflow_string;
return tok;
}

4
Python/Python-tokenize.c
View file

@ -1,6 +1,8 @@
#include "Python.h"
#include "errcode.h"
#include "../Parser/tokenizer.h"
#include "../Parser/lexer/state.h"
#include "../Parser/lexer/lexer.h"
#include "../Parser/tokenizer/tokenizer.h"
#include "../Parser/pegen.h" // _PyPegen_byte_offset_to_character_offset()
#include "../Parser/pegen.h" // _PyPegen_byte_offset_to_character_offset()

2
Tools/c-analyzer/cpython/ignored.tsv
View file

@ -335,7 +335,7 @@ Objects/unicodeobject.c unicode_encode_call_errorhandler argparse -
Objects/unicodeobject.c unicode_translate_call_errorhandler argparse -
Parser/parser.c - reserved_keywords -
Parser/parser.c - soft_keywords -
Parser/tokenizer.c - type_comment_prefix -
Parser/lexer/lexer.c - type_comment_prefix -
Python/ast_opt.c fold_unaryop ops -
Python/ceval.c - _PyEval_BinaryOps -
Python/ceval.c - _Py_INTERPRETER_TRAMPOLINE_INSTRUCTIONS -

Can't render this file because it has a wrong number of fields in line 4.

2
configure generated vendored
View file

@ -26679,6 +26679,8 @@ SRCDIRS="\
Modules/expat \
Objects \
Parser \
Parser/tokenizer \
Parser/lexer \
Programs \
Python \
Python/frozen_modules \

2
configure.ac
View file

@ -6526,6 +6526,8 @@ SRCDIRS="\
Modules/expat \
Objects \
Parser \
Parser/tokenizer \
Parser/lexer \
Programs \
Python \
Python/frozen_modules \