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cpython/Parser/tokenizer.c
Pablo Galindo Salgado cc389ef627
gh-110259: Fix f-strings with multiline expressions and format specs (#110271) 
Signed-off-by: Pablo Galindo <pablogsal@gmail.com>
2023-10-05 14:26:44 +01:00

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/* Tokenizer implementation */
#include "Python.h"
#include "pycore_call.h" // _PyObject_CallNoArgs()
#include "tokenizer.h" // struct tok_state
#include "errcode.h" // E_OK
#ifdef HAVE_UNISTD_H
# include <unistd.h> // read()
#endif
/* Alternate tab spacing */
#define ALTTABSIZE 1
#define is_potential_identifier_start(c) (\
(c >= 'a' && c <= 'z')\
|| (c >= 'A' && c <= 'Z')\
|| c == '_'\
|| (c >= 128))
#define is_potential_identifier_char(c) (\
(c >= 'a' && c <= 'z')\
|| (c >= 'A' && c <= 'Z')\
|| (c >= '0' && c <= '9')\
|| c == '_'\
|| (c >= 128))
/* Don't ever change this -- it would break the portability of Python code */
#define TABSIZE 8
#define MAKE_TOKEN(token_type) token_setup(tok, token, token_type, p_start, p_end)
#define MAKE_TYPE_COMMENT_TOKEN(token_type, col_offset, end_col_offset) (\
type_comment_token_setup(tok, token, token_type, col_offset, end_col_offset, p_start, p_end))
#define ADVANCE_LINENO() \
tok->lineno++; \
tok->col_offset = 0;
#define INSIDE_FSTRING(tok) (tok->tok_mode_stack_index > 0)
#define INSIDE_FSTRING_EXPR(tok) (tok->curly_bracket_expr_start_depth >= 0)
#ifdef Py_DEBUG
static inline tokenizer_mode* TOK_GET_MODE(struct tok_state* tok) {
assert(tok->tok_mode_stack_index >= 0);
assert(tok->tok_mode_stack_index < MAXFSTRINGLEVEL);
return &(tok->tok_mode_stack[tok->tok_mode_stack_index]);
}
static inline tokenizer_mode* TOK_NEXT_MODE(struct tok_state* tok) {
assert(tok->tok_mode_stack_index >= 0);
assert(tok->tok_mode_stack_index + 1 < MAXFSTRINGLEVEL);
return &(tok->tok_mode_stack[++tok->tok_mode_stack_index]);
}
#else
#define TOK_GET_MODE(tok) (&(tok->tok_mode_stack[tok->tok_mode_stack_index]))
#define TOK_NEXT_MODE(tok) (&(tok->tok_mode_stack[++tok->tok_mode_stack_index]))
#endif
/* Forward */
static struct tok_state *tok_new(void);
static int tok_nextc(struct tok_state *tok);
static void tok_backup(struct tok_state *tok, int c);
static int syntaxerror(struct tok_state *tok, const char *format, ...);
/* Spaces in this constant are treated as "zero or more spaces or tabs" when
tokenizing. */
static const char* type_comment_prefix = "# type: ";
/* Create and initialize a new tok_state structure */
static struct tok_state *
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->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 char *
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;
}
static char *
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 */
}
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 = 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 = 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. */
static int
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)) {
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) {
error_ret(tok);
PyErr_Format(PyExc_SyntaxError,
"encoding problem: %s with BOM", cs);
PyMem_Free(cs);
return 0;
}
PyMem_Free(cs);
}
return 1;
}
/* 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. */
static int
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 = new_string("utf-8", 5, tok);
if (!tok->encoding)
return 0;
/* No need to set_readline: input is already utf-8 */
return 1;
}
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;
}
/* Traverse and remember all f-string buffers, in order to be able to restore
them after reallocating tok->buf */
static void
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 */
static void
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;
}
}
static int
set_fstring_expr(struct tok_state* tok, struct token *token, char c) {
assert(token != NULL);
assert(c == '}' || c == ':' || c == '!');
tokenizer_mode *tok_mode = TOK_GET_MODE(tok);
if (!tok_mode->f_string_debug || token->metadata) {
return 0;
}
PyObject *res = PyUnicode_DecodeUTF8(
tok_mode->last_expr_buffer,
tok_mode->last_expr_size - tok_mode->last_expr_end,
NULL
);
if (!res) {
return -1;
}
token->metadata = res;
return 0;
}
static int
update_fstring_expr(struct tok_state *tok, char cur)
{
assert(tok->cur != NULL);
Py_ssize_t size = strlen(tok->cur);
tokenizer_mode *tok_mode = TOK_GET_MODE(tok);
switch (cur) {
case 0:
if (!tok_mode->last_expr_buffer || tok_mode->last_expr_end >= 0) {
return 1;
}
char *new_buffer = PyMem_Realloc(
tok_mode->last_expr_buffer,
tok_mode->last_expr_size + size
);
if (new_buffer == NULL) {
PyMem_Free(tok_mode->last_expr_buffer);
goto error;
}
tok_mode->last_expr_buffer = new_buffer;
strncpy(tok_mode->last_expr_buffer + tok_mode->last_expr_size, tok->cur, size);
tok_mode->last_expr_size += size;
break;
case '{':
if (tok_mode->last_expr_buffer != NULL) {
PyMem_Free(tok_mode->last_expr_buffer);
}
tok_mode->last_expr_buffer = PyMem_Malloc(size);
if (tok_mode->last_expr_buffer == NULL) {
goto error;
}
tok_mode->last_expr_size = size;
tok_mode->last_expr_end = -1;
strncpy(tok_mode->last_expr_buffer, tok->cur, size);
break;
case '}':
case '!':
case ':':
if (tok_mode->last_expr_end == -1) {
tok_mode->last_expr_end = strlen(tok->start);
}
break;
default:
Py_UNREACHABLE();
}
return 1;
error:
tok->done = E_NOMEM;
return 0;
}
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;
}
}
}
/* 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.
*/
static int
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;
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;
restore_fstring_buffers(tok);
}
return 1;
}
static inline int
contains_null_bytes(const char* str, size_t size) {
return memchr(str, 0, size) != NULL;
}
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) {
error_ret(tok);
goto error;
}
}
else {
tok->decoding_buffer = NULL;
}
buf = PyUnicode_AsUTF8AndSize(line, &buflen);
if (buf == NULL) {
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 (!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;
}
/* Set the readline function for TOK to a StreamReader's
readline function. The StreamReader is named ENC.
This function is called from check_bom and 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;
}
/* 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);
}
/* 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;
}
static int
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;
}
/* 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;
}
/* Return a UTF-8 encoding Python string object from the
C byte string STR, which is encoded with ENC. */
static PyObject *
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;
}
static char *
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;
}
/* 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 = translate_newlines(input, single, preserve_crlf, tok);
if (str == NULL)
return NULL;
tok->enc = NULL;
tok->str = str;
if (!check_bom(buf_getc, buf_ungetc, buf_setreadl, tok))
return error_ret(tok);
str = tok->str; /* string after BOM if any */
assert(str);
if (tok->enc != NULL) {
utf8 = translate_into_utf8(str, tok->enc);
if (utf8 == NULL)
return 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 (!check_coding_spec(str, newl[0] - str, tok, buf_setreadl)) {
return NULL;
}
if (tok->enc == NULL && tok->decoding_state != STATE_NORMAL && newl[1]) {
if (!check_coding_spec(newl[0]+1, newl[1] - newl[0],
tok, buf_setreadl))
return NULL;
}
}
if (tok->enc != NULL) {
assert(utf8 == NULL);
utf8 = translate_into_utf8(str, tok->enc);
if (utf8 == NULL)
return 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 = 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;
return tok;
}
struct tok_state *
_PyTokenizer_FromReadline(PyObject* readline, const char* enc,
int exec_input, int preserve_crlf)
{
struct tok_state *tok = 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 = new_string(enc, strlen(enc), tok);
if (!tok->encoding) {
_PyTokenizer_Free(tok);
return NULL;
}
}
tok->decoding_state = STATE_NORMAL;
Py_INCREF(readline);
tok->readline = readline;
return tok;
}
/* 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 = tok_new();
char *translated;
if (tok == NULL)
return NULL;
tok->input = translated = 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 = new_string("utf-8", 5, tok);
if (!tok->encoding) {
_PyTokenizer_Free(tok);
return NULL;
}
tok->buf = tok->cur = tok->inp = translated;
tok->end = translated;
return tok;
}
/* 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 = 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 (enc != NULL) {
/* Must copy encoding declaration since it
gets copied into the parse tree. */
tok->encoding = new_string(enc, strlen(enc), tok);
if (!tok->encoding) {
_PyTokenizer_Free(tok);
return NULL;
}
tok->decoding_state = STATE_NORMAL;
}
return tok;
}
/* 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;
}
static int
tok_readline_raw(struct tok_state *tok)
{
do {
if (!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_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;
}
error_ret(tok);
goto error;
}
if(tok->encoding != NULL) {
if (!PyBytes_Check(raw_line)) {
PyErr_Format(PyExc_TypeError, "readline() returned a non-bytes object");
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) {
error_ret(tok);
goto error;
}
} else {
if(!PyUnicode_Check(raw_line)) {
PyErr_Format(PyExc_TypeError, "readline() returned a non-string object");
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) {
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 (!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_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;
}
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 = 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 = 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;
remember_fstring_buffers(tok);
size_t size = strlen(newtok);
ADVANCE_LINENO();
if (!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;
restore_fstring_buffers(tok);
}
else {
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;
restore_fstring_buffers(tok);
}
if (tok->done != E_OK) {
if (tok->prompt != NULL) {
PySys_WriteStderr("\n");
}
return 0;
}
if (tok->tok_mode_stack_index && !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 (!check_bom(fp_getc, fp_ungetc, fp_setreadl, tok)) {
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 && !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 (!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 && !ensure_utf8(tok->cur, tok)) {
error_ret(tok);
return 0;
}
assert(tok->done == E_OK);
return tok->done == E_OK;
}
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 && !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 && !ensure_utf8(tok->cur, tok)) {
error_ret(tok);
return 0;
}
assert(tok->done == E_OK);
return tok->done == E_OK;
}
#if defined(Py_DEBUG)
static void
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);
}
#endif
/* Get next char, updating state; error code goes into tok->done */
static int
tok_nextc(struct tok_state *tok)
{
int rc;
for (;;) {
if (tok->cur != tok->inp) {
tok->col_offset++;
return Py_CHARMASK(*tok->cur++); /* Fast path */
}
if (tok->done != E_OK) {
return EOF;
}
if (tok->readline) {
rc = tok_underflow_readline(tok);
}
else if (tok->fp == NULL) {
rc = tok_underflow_string(tok);
}
else if (tok->prompt != NULL) {
rc = tok_underflow_interactive(tok);
}
else {
rc = tok_underflow_file(tok);
}
#if defined(Py_DEBUG)
if (tok->debug) {
fprintf(stderr, "line[%d] = ", tok->lineno);
print_escape(stderr, tok->cur, tok->inp - tok->cur);
fprintf(stderr, " tok->done = %d\n", tok->done);
}
#endif
if (!rc) {
tok->cur = tok->inp;
return EOF;
}
tok->line_start = tok->cur;
if (contains_null_bytes(tok->line_start, tok->inp - tok->line_start)) {
syntaxerror(tok, "source code cannot contain null bytes");
tok->cur = tok->inp;
return EOF;
}
}
Py_UNREACHABLE();
}
/* Back-up one character */
static void
tok_backup(struct tok_state *tok, int c)
{
if (c != EOF) {
if (--tok->cur < tok->buf) {
Py_FatalError("tokenizer beginning of buffer");
}
if ((int)(unsigned char)*tok->cur != Py_CHARMASK(c)) {
Py_FatalError("tok_backup: wrong character");
}
tok->col_offset--;
}
}
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;
}
static int
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;
}
static int
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;
}
static int
indenterror(struct tok_state *tok)
{
tok->done = E_TABSPACE;
tok->cur = tok->inp;
return ERRORTOKEN;
}
static int
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();
syntaxerror(tok, "%U", errmsg);
}
goto error;
}
Py_DECREF(errmsg);
return 0;
error:
Py_XDECREF(errmsg);
tok->done = E_ERROR;
return -1;
}
static int
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 syntaxerror(tok, "invalid escape sequence '\\%c'", (char) first_invalid_escape_char);
}
return -1;
}
Py_DECREF(msg);
return 0;
}
static int
lookahead(struct tok_state *tok, const char *test)
{
const char *s = test;
int res = 0;
while (1) {
int c = tok_nextc(tok);
if (*s == 0) {
res = !is_potential_identifier_char(c);
}
else if (c == *s) {
s++;
continue;
}
tok_backup(tok, c);
while (s != test) {
tok_backup(tok, *--s);
}
return res;
}
}
static int
verify_end_of_number(struct tok_state *tok, int c, const char *kind) {
if (tok->tok_extra_tokens) {
// When we are parsing extra tokens, we don't want to emit warnings
// about invalid literals, because we want to be a bit more liberal.
return 1;
}
/* Emit a deprecation warning only if the numeric literal is immediately
* followed by one of keywords which can occur after a numeric literal
* in valid code: "and", "else", "for", "if", "in", "is" and "or".
* It allows to gradually deprecate existing valid code without adding
* warning before error in most cases of invalid numeric literal (which
* would be confusing and break existing tests).
* Raise a syntax error with slightly better message than plain
* "invalid syntax" if the numeric literal is immediately followed by
* other keyword or identifier.
*/
int r = 0;
if (c == 'a') {
r = lookahead(tok, "nd");
}
else if (c == 'e') {
r = lookahead(tok, "lse");
}
else if (c == 'f') {
r = lookahead(tok, "or");
}
else if (c == 'i') {
int c2 = tok_nextc(tok);
if (c2 == 'f' || c2 == 'n' || c2 == 's') {
r = 1;
}
tok_backup(tok, c2);
}
else if (c == 'o') {
r = lookahead(tok, "r");
}
else if (c == 'n') {
r = lookahead(tok, "ot");
}
if (r) {
tok_backup(tok, c);
if (parser_warn(tok, PyExc_SyntaxWarning,
"invalid %s literal", kind))
{
return 0;
}
tok_nextc(tok);
}
else /* In future releases, only error will remain. */
if (c < 128 && is_potential_identifier_char(c)) {
tok_backup(tok, c);
syntaxerror(tok, "invalid %s literal", kind);
return 0;
}
return 1;
}
/* Verify that the identifier follows PEP 3131.
All identifier strings are guaranteed to be "ready" unicode objects.
*/
static int
verify_identifier(struct tok_state *tok)
{
if (tok->tok_extra_tokens) {
return 1;
}
PyObject *s;
if (tok->decoding_erred)
return 0;
s = PyUnicode_DecodeUTF8(tok->start, tok->cur - tok->start, NULL);
if (s == NULL) {
if (PyErr_ExceptionMatches(PyExc_UnicodeDecodeError)) {
tok->done = E_DECODE;
}
else {
tok->done = E_ERROR;
}
return 0;
}
Py_ssize_t invalid = _PyUnicode_ScanIdentifier(s);
if (invalid < 0) {
Py_DECREF(s);
tok->done = E_ERROR;
return 0;
}
assert(PyUnicode_GET_LENGTH(s) > 0);
if (invalid < PyUnicode_GET_LENGTH(s)) {
Py_UCS4 ch = PyUnicode_READ_CHAR(s, invalid);
if (invalid + 1 < PyUnicode_GET_LENGTH(s)) {
/* Determine the offset in UTF-8 encoded input */
Py_SETREF(s, PyUnicode_Substring(s, 0, invalid + 1));
if (s != NULL) {
Py_SETREF(s, PyUnicode_AsUTF8String(s));
}
if (s == NULL) {
tok->done = E_ERROR;
return 0;
}
tok->cur = (char *)tok->start + PyBytes_GET_SIZE(s);
}
Py_DECREF(s);
if (Py_UNICODE_ISPRINTABLE(ch)) {
syntaxerror(tok, "invalid character '%c' (U+%04X)", ch, ch);
}
else {
syntaxerror(tok, "invalid non-printable character U+%04X", ch);
}
return 0;
}
Py_DECREF(s);
return 1;
}
static int
tok_decimal_tail(struct tok_state *tok)
{
int c;
while (1) {
do {
c = tok_nextc(tok);
} while (Py_ISDIGIT(c));
if (c != '_') {
break;
}
c = tok_nextc(tok);
if (!Py_ISDIGIT(c)) {
tok_backup(tok, c);
syntaxerror(tok, "invalid decimal literal");
return 0;
}
}
return c;
}
static inline int
tok_continuation_line(struct tok_state *tok) {
int c = tok_nextc(tok);
if (c == '\r') {
c = tok_nextc(tok);
}
if (c != '\n') {
tok->done = E_LINECONT;
return -1;
}
c = tok_nextc(tok);
if (c == EOF) {
tok->done = E_EOF;
tok->cur = tok->inp;
return -1;
} else {
tok_backup(tok, c);
}
return c;
}
static int
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;
}
static int
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;
}
static int
tok_get_normal_mode(struct tok_state *tok, tokenizer_mode* current_tok, struct token *token)
{
int c;
int blankline, nonascii;
const char *p_start = NULL;
const char *p_end = NULL;
nextline:
tok->start = NULL;
tok->starting_col_offset = -1;
blankline = 0;
/* Get indentation level */
if (tok->atbol) {
int col = 0;
int altcol = 0;
tok->atbol = 0;
int cont_line_col = 0;
for (;;) {
c = tok_nextc(tok);
if (c == ' ') {
col++, altcol++;
}
else if (c == '\t') {
col = (col / tok->tabsize + 1) * tok->tabsize;
altcol = (altcol / ALTTABSIZE + 1) * ALTTABSIZE;
}
else if (c == '\014') {/* Control-L (formfeed) */
col = altcol = 0; /* For Emacs users */
}
else if (c == '\\') {
// Indentation cannot be split over multiple physical lines
// using backslashes. This means that if we found a backslash
// preceded by whitespace, **the first one we find** determines
// the level of indentation of whatever comes next.
cont_line_col = cont_line_col ? cont_line_col : col;
if ((c = tok_continuation_line(tok)) == -1) {
return MAKE_TOKEN(ERRORTOKEN);
}
}
else {
break;
}
}
tok_backup(tok, c);
if (c == '#' || c == '\n' || c == '\r') {
/* Lines with only whitespace and/or comments
shouldn't affect the indentation and are
not passed to the parser as NEWLINE tokens,
except *totally* empty lines in interactive
mode, which signal the end of a command group. */
if (col == 0 && c == '\n' && tok->prompt != NULL) {
blankline = 0; /* Let it through */
}
else if (tok->prompt != NULL && tok->lineno == 1) {
/* In interactive mode, if the first line contains
only spaces and/or a comment, let it through. */
blankline = 0;
col = altcol = 0;
}
else {
blankline = 1; /* Ignore completely */
}
/* We can't jump back right here since we still
may need to skip to the end of a comment */
}
if (!blankline && tok->level == 0) {
col = cont_line_col ? cont_line_col : col;
altcol = cont_line_col ? cont_line_col : altcol;
if (col == tok->indstack[tok->indent]) {
/* No change */
if (altcol != tok->altindstack[tok->indent]) {
return MAKE_TOKEN(indenterror(tok));
}
}
else if (col > tok->indstack[tok->indent]) {
/* Indent -- always one */
if (tok->indent+1 >= MAXINDENT) {
tok->done = E_TOODEEP;
tok->cur = tok->inp;
return MAKE_TOKEN(ERRORTOKEN);
}
if (altcol <= tok->altindstack[tok->indent]) {
return MAKE_TOKEN(indenterror(tok));
}
tok->pendin++;
tok->indstack[++tok->indent] = col;
tok->altindstack[tok->indent] = altcol;
}
else /* col < tok->indstack[tok->indent] */ {
/* Dedent -- any number, must be consistent */
while (tok->indent > 0 &&
col < tok->indstack[tok->indent]) {
tok->pendin--;
tok->indent--;
}
if (col != tok->indstack[tok->indent]) {
tok->done = E_DEDENT;
tok->cur = tok->inp;
return MAKE_TOKEN(ERRORTOKEN);
}
if (altcol != tok->altindstack[tok->indent]) {
return MAKE_TOKEN(indenterror(tok));
}
}
}
}
tok->start = tok->cur;
tok->starting_col_offset = tok->col_offset;
/* Return pending indents/dedents */
if (tok->pendin != 0) {
if (tok->pendin < 0) {
if (tok->tok_extra_tokens) {
p_start = tok->cur;
p_end = tok->cur;
}
tok->pendin++;
return MAKE_TOKEN(DEDENT);
}
else {
if (tok->tok_extra_tokens) {
p_start = tok->buf;
p_end = tok->cur;
}
tok->pendin--;
return MAKE_TOKEN(INDENT);
}
}
/* Peek ahead at the next character */
c = tok_nextc(tok);
tok_backup(tok, c);
again:
tok->start = NULL;
/* Skip spaces */
do {
c = tok_nextc(tok);
} while (c == ' ' || c == '\t' || c == '\014');
/* Set start of current token */
tok->start = tok->cur == NULL ? NULL : tok->cur - 1;
tok->starting_col_offset = tok->col_offset - 1;
/* Skip comment, unless it's a type comment */
if (c == '#') {
const char* p = NULL;
const char *prefix, *type_start;
int current_starting_col_offset;
while (c != EOF && c != '\n' && c != '\r') {
c = tok_nextc(tok);
}
if (tok->tok_extra_tokens) {
p = tok->start;
}
if (tok->type_comments) {
p = tok->start;
current_starting_col_offset = tok->starting_col_offset;
prefix = type_comment_prefix;
while (*prefix && p < tok->cur) {
if (*prefix == ' ') {
while (*p == ' ' || *p == '\t') {
p++;
current_starting_col_offset++;
}
} else if (*prefix == *p) {
p++;
current_starting_col_offset++;
} else {
break;
}
prefix++;
}
/* This is a type comment if we matched all of type_comment_prefix. */
if (!*prefix) {
int is_type_ignore = 1;
// +6 in order to skip the word 'ignore'
const char *ignore_end = p + 6;
const int ignore_end_col_offset = current_starting_col_offset + 6;
tok_backup(tok, c); /* don't eat the newline or EOF */
type_start = p;
/* A TYPE_IGNORE is "type: ignore" followed by the end of the token
* or anything ASCII and non-alphanumeric. */
is_type_ignore = (
tok->cur >= ignore_end && memcmp(p, "ignore", 6) == 0
&& !(tok->cur > ignore_end
&& ((unsigned char)ignore_end[0] >= 128 || Py_ISALNUM(ignore_end[0]))));
if (is_type_ignore) {
p_start = ignore_end;
p_end = tok->cur;
/* If this type ignore is the only thing on the line, consume the newline also. */
if (blankline) {
tok_nextc(tok);
tok->atbol = 1;
}
return MAKE_TYPE_COMMENT_TOKEN(TYPE_IGNORE, ignore_end_col_offset, tok->col_offset);
} else {
p_start = type_start;
p_end = tok->cur;
return MAKE_TYPE_COMMENT_TOKEN(TYPE_COMMENT, current_starting_col_offset, tok->col_offset);
}
}
}
if (tok->tok_extra_tokens) {
tok_backup(tok, c); /* don't eat the newline or EOF */
p_start = p;
p_end = tok->cur;
tok->comment_newline = blankline;
return MAKE_TOKEN(COMMENT);
}
}
if (tok->done == E_INTERACT_STOP) {
return MAKE_TOKEN(ENDMARKER);
}
/* Check for EOF and errors now */
if (c == EOF) {
if (tok->level) {
return MAKE_TOKEN(ERRORTOKEN);
}
return MAKE_TOKEN(tok->done == E_EOF ? ENDMARKER : ERRORTOKEN);
}
/* Identifier (most frequent token!) */
nonascii = 0;
if (is_potential_identifier_start(c)) {
/* Process the various legal combinations of b"", r"", u"", and f"". */
int saw_b = 0, saw_r = 0, saw_u = 0, saw_f = 0;
while (1) {
if (!(saw_b || saw_u || saw_f) && (c == 'b' || c == 'B'))
saw_b = 1;
/* Since this is a backwards compatibility support literal we don't
want to support it in arbitrary order like byte literals. */
else if (!(saw_b || saw_u || saw_r || saw_f)
&& (c == 'u'|| c == 'U')) {
saw_u = 1;
}
/* ur"" and ru"" are not supported */
else if (!(saw_r || saw_u) && (c == 'r' || c == 'R')) {
saw_r = 1;
}
else if (!(saw_f || saw_b || saw_u) && (c == 'f' || c == 'F')) {
saw_f = 1;
}
else {
break;
}
c = tok_nextc(tok);
if (c == '"' || c == '\'') {
if (saw_f) {
goto f_string_quote;
}
goto letter_quote;
}
}
while (is_potential_identifier_char(c)) {
if (c >= 128) {
nonascii = 1;
}
c = tok_nextc(tok);
}
tok_backup(tok, c);
if (nonascii && !verify_identifier(tok)) {
return MAKE_TOKEN(ERRORTOKEN);
}
p_start = tok->start;
p_end = tok->cur;
return MAKE_TOKEN(NAME);
}
if (c == '\r') {
c = tok_nextc(tok);
}
/* Newline */
if (c == '\n') {
tok->atbol = 1;
if (blankline || tok->level > 0) {
if (tok->tok_extra_tokens) {
if (tok->comment_newline) {
tok->comment_newline = 0;
}
p_start = tok->start;
p_end = tok->cur;
return MAKE_TOKEN(NL);
}
goto nextline;
}
if (tok->comment_newline && tok->tok_extra_tokens) {
tok->comment_newline = 0;
p_start = tok->start;
p_end = tok->cur;
return MAKE_TOKEN(NL);
}
p_start = tok->start;
p_end = tok->cur - 1; /* Leave '\n' out of the string */
tok->cont_line = 0;
return MAKE_TOKEN(NEWLINE);
}
/* Period or number starting with period? */
if (c == '.') {
c = tok_nextc(tok);
if (Py_ISDIGIT(c)) {
goto fraction;
} else if (c == '.') {
c = tok_nextc(tok);
if (c == '.') {
p_start = tok->start;
p_end = tok->cur;
return MAKE_TOKEN(ELLIPSIS);
}
else {
tok_backup(tok, c);
}
tok_backup(tok, '.');
}
else {
tok_backup(tok, c);
}
p_start = tok->start;
p_end = tok->cur;
return MAKE_TOKEN(DOT);
}
/* Number */
if (Py_ISDIGIT(c)) {
if (c == '0') {
/* Hex, octal or binary -- maybe. */
c = tok_nextc(tok);
if (c == 'x' || c == 'X') {
/* Hex */
c = tok_nextc(tok);
do {
if (c == '_') {
c = tok_nextc(tok);
}
if (!Py_ISXDIGIT(c)) {
tok_backup(tok, c);
return MAKE_TOKEN(syntaxerror(tok, "invalid hexadecimal literal"));
}
do {
c = tok_nextc(tok);
} while (Py_ISXDIGIT(c));
} while (c == '_');
if (!verify_end_of_number(tok, c, "hexadecimal")) {
return MAKE_TOKEN(ERRORTOKEN);
}
}
else if (c == 'o' || c == 'O') {
/* Octal */
c = tok_nextc(tok);
do {
if (c == '_') {
c = tok_nextc(tok);
}
if (c < '0' || c >= '8') {
if (Py_ISDIGIT(c)) {
return MAKE_TOKEN(syntaxerror(tok,
"invalid digit '%c' in octal literal", c));
}
else {
tok_backup(tok, c);
return MAKE_TOKEN(syntaxerror(tok, "invalid octal literal"));
}
}
do {
c = tok_nextc(tok);
} while ('0' <= c && c < '8');
} while (c == '_');
if (Py_ISDIGIT(c)) {
return MAKE_TOKEN(syntaxerror(tok,
"invalid digit '%c' in octal literal", c));
}
if (!verify_end_of_number(tok, c, "octal")) {
return MAKE_TOKEN(ERRORTOKEN);
}
}
else if (c == 'b' || c == 'B') {
/* Binary */
c = tok_nextc(tok);
do {
if (c == '_') {
c = tok_nextc(tok);
}
if (c != '0' && c != '1') {
if (Py_ISDIGIT(c)) {
return MAKE_TOKEN(syntaxerror(tok, "invalid digit '%c' in binary literal", c));
}
else {
tok_backup(tok, c);
return MAKE_TOKEN(syntaxerror(tok, "invalid binary literal"));
}
}
do {
c = tok_nextc(tok);
} while (c == '0' || c == '1');
} while (c == '_');
if (Py_ISDIGIT(c)) {
return MAKE_TOKEN(syntaxerror(tok, "invalid digit '%c' in binary literal", c));
}
if (!verify_end_of_number(tok, c, "binary")) {
return MAKE_TOKEN(ERRORTOKEN);
}
}
else {
int nonzero = 0;
/* maybe old-style octal; c is first char of it */
/* in any case, allow '0' as a literal */
while (1) {
if (c == '_') {
c = tok_nextc(tok);
if (!Py_ISDIGIT(c)) {
tok_backup(tok, c);
return MAKE_TOKEN(syntaxerror(tok, "invalid decimal literal"));
}
}
if (c != '0') {
break;
}
c = tok_nextc(tok);
}
char* zeros_end = tok->cur;
if (Py_ISDIGIT(c)) {
nonzero = 1;
c = tok_decimal_tail(tok);
if (c == 0) {
return MAKE_TOKEN(ERRORTOKEN);
}
}
if (c == '.') {
c = tok_nextc(tok);
goto fraction;
}
else if (c == 'e' || c == 'E') {
goto exponent;
}
else if (c == 'j' || c == 'J') {
goto imaginary;
}
else if (nonzero && !tok->tok_extra_tokens) {
/* Old-style octal: now disallowed. */
tok_backup(tok, c);
return MAKE_TOKEN(syntaxerror_known_range(
tok, (int)(tok->start + 1 - tok->line_start),
(int)(zeros_end - tok->line_start),
"leading zeros in decimal integer "
"literals are not permitted; "
"use an 0o prefix for octal integers"));
}
if (!verify_end_of_number(tok, c, "decimal")) {
return MAKE_TOKEN(ERRORTOKEN);
}
}
}
else {
/* Decimal */
c = tok_decimal_tail(tok);
if (c == 0) {
return MAKE_TOKEN(ERRORTOKEN);
}
{
/* Accept floating point numbers. */
if (c == '.') {
c = tok_nextc(tok);
fraction:
/* Fraction */
if (Py_ISDIGIT(c)) {
c = tok_decimal_tail(tok);
if (c == 0) {
return MAKE_TOKEN(ERRORTOKEN);
}
}
}
if (c == 'e' || c == 'E') {
int e;
exponent:
e = c;
/* Exponent part */
c = tok_nextc(tok);
if (c == '+' || c == '-') {
c = tok_nextc(tok);
if (!Py_ISDIGIT(c)) {
tok_backup(tok, c);
return MAKE_TOKEN(syntaxerror(tok, "invalid decimal literal"));
}
} else if (!Py_ISDIGIT(c)) {
tok_backup(tok, c);
if (!verify_end_of_number(tok, e, "decimal")) {
return MAKE_TOKEN(ERRORTOKEN);
}
tok_backup(tok, e);
p_start = tok->start;
p_end = tok->cur;
return MAKE_TOKEN(NUMBER);
}
c = tok_decimal_tail(tok);
if (c == 0) {
return MAKE_TOKEN(ERRORTOKEN);
}
}
if (c == 'j' || c == 'J') {
/* Imaginary part */
imaginary:
c = tok_nextc(tok);
if (!verify_end_of_number(tok, c, "imaginary")) {
return MAKE_TOKEN(ERRORTOKEN);
}
}
else if (!verify_end_of_number(tok, c, "decimal")) {
return MAKE_TOKEN(ERRORTOKEN);
}
}
}
tok_backup(tok, c);
p_start = tok->start;
p_end = tok->cur;
return MAKE_TOKEN(NUMBER);
}
f_string_quote:
if (((Py_TOLOWER(*tok->start) == 'f' || Py_TOLOWER(*tok->start) == 'r') && (c == '\'' || c == '"'))) {
int quote = c;
int quote_size = 1; /* 1 or 3 */
/* Nodes of type STRING, especially multi line strings
must be handled differently in order to get both
the starting line number and the column offset right.
(cf. issue 16806) */
tok->first_lineno = tok->lineno;
tok->multi_line_start = tok->line_start;
/* Find the quote size and start of string */
int after_quote = tok_nextc(tok);
if (after_quote == quote) {
int after_after_quote = tok_nextc(tok);
if (after_after_quote == quote) {
quote_size = 3;
}
else {
// TODO: Check this
tok_backup(tok, after_after_quote);
tok_backup(tok, after_quote);
}
}
if (after_quote != quote) {
tok_backup(tok, after_quote);
}
p_start = tok->start;
p_end = tok->cur;
if (tok->tok_mode_stack_index + 1 >= MAXFSTRINGLEVEL) {
return MAKE_TOKEN(syntaxerror(tok, "too many nested f-strings"));
}
tokenizer_mode *the_current_tok = TOK_NEXT_MODE(tok);
the_current_tok->kind = TOK_FSTRING_MODE;
the_current_tok->f_string_quote = quote;
the_current_tok->f_string_quote_size = quote_size;
the_current_tok->f_string_start = tok->start;
the_current_tok->f_string_multi_line_start = tok->line_start;
the_current_tok->f_string_line_start = tok->lineno;
the_current_tok->f_string_start_offset = -1;
the_current_tok->f_string_multi_line_start_offset = -1;
the_current_tok->last_expr_buffer = NULL;
the_current_tok->last_expr_size = 0;
the_current_tok->last_expr_end = -1;
the_current_tok->f_string_debug = 0;
switch (*tok->start) {
case 'F':
case 'f':
the_current_tok->f_string_raw = Py_TOLOWER(*(tok->start + 1)) == 'r';
break;
case 'R':
case 'r':
the_current_tok->f_string_raw = 1;
break;
default:
Py_UNREACHABLE();
}
the_current_tok->curly_bracket_depth = 0;
the_current_tok->curly_bracket_expr_start_depth = -1;
return MAKE_TOKEN(FSTRING_START);
}
letter_quote:
/* String */
if (c == '\'' || c == '"') {
int quote = c;
int quote_size = 1; /* 1 or 3 */
int end_quote_size = 0;
/* Nodes of type STRING, especially multi line strings
must be handled differently in order to get both
the starting line number and the column offset right.
(cf. issue 16806) */
tok->first_lineno = tok->lineno;
tok->multi_line_start = tok->line_start;
/* Find the quote size and start of string */
c = tok_nextc(tok);
if (c == quote) {
c = tok_nextc(tok);
if (c == quote) {
quote_size = 3;
}
else {
end_quote_size = 1; /* empty string found */
}
}
if (c != quote) {
tok_backup(tok, c);
}
/* Get rest of string */
while (end_quote_size != quote_size) {
c = tok_nextc(tok);
if (tok->done == E_ERROR) {
return MAKE_TOKEN(ERRORTOKEN);
}
if (tok->done == E_DECODE) {
break;
}
if (c == EOF || (quote_size == 1 && c == '\n')) {
assert(tok->multi_line_start != NULL);
// shift the tok_state's location into
// the start of string, and report the error
// from the initial quote character
tok->cur = (char *)tok->start;
tok->cur++;
tok->line_start = tok->multi_line_start;
int start = tok->lineno;
tok->lineno = tok->first_lineno;
if (INSIDE_FSTRING(tok)) {
/* When we are in an f-string, before raising the
* unterminated string literal error, check whether
* does the initial quote matches with f-strings quotes
* and if it is, then this must be a missing '}' token
* so raise the proper error */
tokenizer_mode *the_current_tok = TOK_GET_MODE(tok);
if (the_current_tok->f_string_quote == quote &&
the_current_tok->f_string_quote_size == quote_size) {
return MAKE_TOKEN(syntaxerror(tok, "f-string: expecting '}'", start));
}
}
if (quote_size == 3) {
syntaxerror(tok, "unterminated triple-quoted string literal"
" (detected at line %d)", start);
if (c != '\n') {
tok->done = E_EOFS;
}
return MAKE_TOKEN(ERRORTOKEN);
}
else {
syntaxerror(tok, "unterminated string literal (detected at"
" line %d)", start);
if (c != '\n') {
tok->done = E_EOLS;
}
return MAKE_TOKEN(ERRORTOKEN);
}
}
if (c == quote) {
end_quote_size += 1;
}
else {
end_quote_size = 0;
if (c == '\\') {
c = tok_nextc(tok); /* skip escaped char */
if (c == '\r') {
c = tok_nextc(tok);
}
}
}
}
p_start = tok->start;
p_end = tok->cur;
return MAKE_TOKEN(STRING);
}
/* Line continuation */
if (c == '\\') {
if ((c = tok_continuation_line(tok)) == -1) {
return MAKE_TOKEN(ERRORTOKEN);
}
tok->cont_line = 1;
goto again; /* Read next line */
}
/* Punctuation character */
int is_punctuation = (c == ':' || c == '}' || c == '!' || c == '{');
if (is_punctuation && INSIDE_FSTRING(tok) && INSIDE_FSTRING_EXPR(current_tok)) {
/* This code block gets executed before the curly_bracket_depth is incremented
* by the `{` case, so for ensuring that we are on the 0th level, we need
* to adjust it manually */
int cursor = current_tok->curly_bracket_depth - (c != '{');
if (cursor == 0 && !update_fstring_expr(tok, c)) {
return MAKE_TOKEN(ENDMARKER);
}
if (cursor == 0 && c != '{' && set_fstring_expr(tok, token, c)) {
return MAKE_TOKEN(ERRORTOKEN);
}
if (c == ':' && cursor == current_tok->curly_bracket_expr_start_depth) {
current_tok->kind = TOK_FSTRING_MODE;
p_start = tok->start;
p_end = tok->cur;
return MAKE_TOKEN(_PyToken_OneChar(c));
}
}
/* Check for two-character token */
{
int c2 = tok_nextc(tok);
int current_token = _PyToken_TwoChars(c, c2);
if (current_token != OP) {
int c3 = tok_nextc(tok);
int current_token3 = _PyToken_ThreeChars(c, c2, c3);
if (current_token3 != OP) {
current_token = current_token3;
}
else {
tok_backup(tok, c3);
}
p_start = tok->start;
p_end = tok->cur;
return MAKE_TOKEN(current_token);
}
tok_backup(tok, c2);
}
/* Keep track of parentheses nesting level */
switch (c) {
case '(':
case '[':
case '{':
if (tok->level >= MAXLEVEL) {
return MAKE_TOKEN(syntaxerror(tok, "too many nested parentheses"));
}
tok->parenstack[tok->level] = c;
tok->parenlinenostack[tok->level] = tok->lineno;
tok->parencolstack[tok->level] = (int)(tok->start - tok->line_start);
tok->level++;
if (INSIDE_FSTRING(tok)) {
current_tok->curly_bracket_depth++;
}
break;
case ')':
case ']':
case '}':
if (INSIDE_FSTRING(tok) && !current_tok->curly_bracket_depth && c == '}') {
return MAKE_TOKEN(syntaxerror(tok, "f-string: single '}' is not allowed"));
}
if (!tok->tok_extra_tokens && !tok->level) {
return MAKE_TOKEN(syntaxerror(tok, "unmatched '%c'", c));
}
if (tok->level > 0) {
tok->level--;
int opening = tok->parenstack[tok->level];
if (!tok->tok_extra_tokens && !((opening == '(' && c == ')') ||
(opening == '[' && c == ']') ||
(opening == '{' && c == '}'))) {
/* If the opening bracket belongs to an f-string's expression
part (e.g. f"{)}") and the closing bracket is an arbitrary
nested expression, then instead of matching a different
syntactical construct with it; we'll throw an unmatched
parentheses error. */
if (INSIDE_FSTRING(tok) && opening == '{') {
assert(current_tok->curly_bracket_depth >= 0);
int previous_bracket = current_tok->curly_bracket_depth - 1;
if (previous_bracket == current_tok->curly_bracket_expr_start_depth) {
return MAKE_TOKEN(syntaxerror(tok, "f-string: unmatched '%c'", c));
}
}
if (tok->parenlinenostack[tok->level] != tok->lineno) {
return MAKE_TOKEN(syntaxerror(tok,
"closing parenthesis '%c' does not match "
"opening parenthesis '%c' on line %d",
c, opening, tok->parenlinenostack[tok->level]));
}
else {
return MAKE_TOKEN(syntaxerror(tok,
"closing parenthesis '%c' does not match "
"opening parenthesis '%c'",
c, opening));
}
}
}
if (INSIDE_FSTRING(tok)) {
current_tok->curly_bracket_depth--;
if (c == '}' && current_tok->curly_bracket_depth == current_tok->curly_bracket_expr_start_depth) {
current_tok->curly_bracket_expr_start_depth--;
current_tok->kind = TOK_FSTRING_MODE;
current_tok->f_string_debug = 0;
}
}
break;
default:
break;
}
if (!Py_UNICODE_ISPRINTABLE(c)) {
return MAKE_TOKEN(syntaxerror(tok, "invalid non-printable character U+%04X", c));
}
if( c == '=' && INSIDE_FSTRING_EXPR(current_tok)) {
current_tok->f_string_debug = 1;
}
/* Punctuation character */
p_start = tok->start;
p_end = tok->cur;
return MAKE_TOKEN(_PyToken_OneChar(c));
}
static int
tok_get_fstring_mode(struct tok_state *tok, tokenizer_mode* current_tok, struct token *token)
{
const char *p_start = NULL;
const char *p_end = NULL;
int end_quote_size = 0;
int unicode_escape = 0;
tok->start = tok->cur;
tok->first_lineno = tok->lineno;
tok->starting_col_offset = tok->col_offset;
// If we start with a bracket, we defer to the normal mode as there is nothing for us to tokenize
// before it.
int start_char = tok_nextc(tok);
if (start_char == '{') {
int peek1 = tok_nextc(tok);
tok_backup(tok, peek1);
tok_backup(tok, start_char);
if (peek1 != '{') {
current_tok->curly_bracket_expr_start_depth++;
if (current_tok->curly_bracket_expr_start_depth >= MAX_EXPR_NESTING) {
return MAKE_TOKEN(syntaxerror(tok, "f-string: expressions nested too deeply"));
}
TOK_GET_MODE(tok)->kind = TOK_REGULAR_MODE;
return tok_get_normal_mode(tok, current_tok, token);
}
}
else {
tok_backup(tok, start_char);
}
// Check if we are at the end of the string
for (int i = 0; i < current_tok->f_string_quote_size; i++) {
int quote = tok_nextc(tok);
if (quote != current_tok->f_string_quote) {
tok_backup(tok, quote);
goto f_string_middle;
}
}
if (current_tok->last_expr_buffer != NULL) {
PyMem_Free(current_tok->last_expr_buffer);
current_tok->last_expr_buffer = NULL;
current_tok->last_expr_size = 0;
current_tok->last_expr_end = -1;
}
p_start = tok->start;
p_end = tok->cur;
tok->tok_mode_stack_index--;
return MAKE_TOKEN(FSTRING_END);
f_string_middle:
// TODO: This is a bit of a hack, but it works for now. We need to find a better way to handle
// this.
tok->multi_line_start = tok->line_start;
while (end_quote_size != current_tok->f_string_quote_size) {
int c = tok_nextc(tok);
if (tok->done == E_ERROR) {
return MAKE_TOKEN(ERRORTOKEN);
}
int in_format_spec = (
current_tok->last_expr_end != -1
&&
INSIDE_FSTRING_EXPR(current_tok)
);
if (c == EOF || (current_tok->f_string_quote_size == 1 && c == '\n')) {
if (tok->decoding_erred) {
return MAKE_TOKEN(ERRORTOKEN);
}
// If we are in a format spec and we found a newline,
// it means that the format spec ends here and we should
// return to the regular mode.
if (in_format_spec && c == '\n') {
tok_backup(tok, c);
TOK_GET_MODE(tok)->kind = TOK_REGULAR_MODE;
p_start = tok->start;
p_end = tok->cur;
return MAKE_TOKEN(FSTRING_MIDDLE);
}
assert(tok->multi_line_start != NULL);
// shift the tok_state's location into
// the start of string, and report the error
// from the initial quote character
tok->cur = (char *)current_tok->f_string_start;
tok->cur++;
tok->line_start = current_tok->f_string_multi_line_start;
int start = tok->lineno;
tokenizer_mode *the_current_tok = TOK_GET_MODE(tok);
tok->lineno = the_current_tok->f_string_line_start;
if (current_tok->f_string_quote_size == 3) {
return MAKE_TOKEN(syntaxerror(tok,
"unterminated triple-quoted f-string literal"
" (detected at line %d)", start));
}
else {
return MAKE_TOKEN(syntaxerror(tok,
"unterminated f-string literal (detected at"
" line %d)", start));
}
}
if (c == current_tok->f_string_quote) {
end_quote_size += 1;
continue;
} else {
end_quote_size = 0;
}
if (c == '{') {
int peek = tok_nextc(tok);
if (peek != '{' || in_format_spec) {
tok_backup(tok, peek);
tok_backup(tok, c);
current_tok->curly_bracket_expr_start_depth++;
if (current_tok->curly_bracket_expr_start_depth >= MAX_EXPR_NESTING) {
return MAKE_TOKEN(syntaxerror(tok, "f-string: expressions nested too deeply"));
}
TOK_GET_MODE(tok)->kind = TOK_REGULAR_MODE;
p_start = tok->start;
p_end = tok->cur;
} else {
p_start = tok->start;
p_end = tok->cur - 1;
}
return MAKE_TOKEN(FSTRING_MIDDLE);
} else if (c == '}') {
if (unicode_escape) {
p_start = tok->start;
p_end = tok->cur;
return MAKE_TOKEN(FSTRING_MIDDLE);
}
int peek = tok_nextc(tok);
// The tokenizer can only be in the format spec if we have already completed the expression
// scanning (indicated by the end of the expression being set) and we are not at the top level
// of the bracket stack (-1 is the top level). Since format specifiers can't legally use double
// brackets, we can bypass it here.
if (peek == '}' && !in_format_spec) {
p_start = tok->start;
p_end = tok->cur - 1;
} else {
tok_backup(tok, peek);
tok_backup(tok, c);
TOK_GET_MODE(tok)->kind = TOK_REGULAR_MODE;
p_start = tok->start;
p_end = tok->cur;
}
return MAKE_TOKEN(FSTRING_MIDDLE);
} else if (c == '\\') {
int peek = tok_nextc(tok);
if (peek == '\r') {
peek = tok_nextc(tok);
}
// Special case when the backslash is right before a curly
// brace. We have to restore and return the control back
// to the loop for the next iteration.
if (peek == '{' || peek == '}') {
if (!current_tok->f_string_raw) {
if (warn_invalid_escape_sequence(tok, peek)) {
return MAKE_TOKEN(ERRORTOKEN);
}
}
tok_backup(tok, peek);
continue;
}
if (!current_tok->f_string_raw) {
if (peek == 'N') {
/* Handle named unicode escapes (\N{BULLET}) */
peek = tok_nextc(tok);
if (peek == '{') {
unicode_escape = 1;
} else {
tok_backup(tok, peek);
}
}
} /* else {
skip the escaped character
}*/
}
}
// Backup the f-string quotes to emit a final FSTRING_MIDDLE and
// add the quotes to the FSTRING_END in the next tokenizer iteration.
for (int i = 0; i < current_tok->f_string_quote_size; i++) {
tok_backup(tok, current_tok->f_string_quote);
}
p_start = tok->start;
p_end = tok->cur;
return MAKE_TOKEN(FSTRING_MIDDLE);
}
static int
tok_get(struct tok_state *tok, struct token *token)
{
tokenizer_mode *current_tok = TOK_GET_MODE(tok);
if (current_tok->kind == TOK_REGULAR_MODE) {
return tok_get_normal_mode(tok, current_tok, token);
} else {
return tok_get_fstring_mode(tok, current_tok, token);
}
}
int
_PyTokenizer_Get(struct tok_state *tok, struct token *token)
{
int result = tok_get(tok, token);
if (tok->decoding_erred) {
result = ERRORTOKEN;
tok->done = E_DECODE;
}
return result;
}
#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;
}
#ifdef Py_DEBUG
void
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 // Py_DEBUG
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