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bpo-25643: Refactor the C tokenizer into smaller, logical units (GH-25050)

This commit is contained in:
Pablo Galindo 2021-03-28 23:48:05 +01:00 committed by GitHub
parent fb1d01b963
commit 261a452a13
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 354 additions and 360 deletions
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4
Lib/test/test_eof.py
View File

@ -55,13 +55,13 @@ class EOFTestCase(unittest.TestCase):
file_name = script_helper.make_script(temp_dir, 'foo', '\\')
rc, out, err = script_helper.assert_python_failure(file_name)
self.assertIn(b'unexpected EOF while parsing', err)
self.assertIn(b'line 2', err)
self.assertIn(b'line 1', err)
self.assertIn(b'\\', err)
file_name = script_helper.make_script(temp_dir, 'foo', 'y = 6\\')
rc, out, err = script_helper.assert_python_failure(file_name)
self.assertIn(b'unexpected EOF while parsing', err)
self.assertIn(b'line 2', err)
self.assertIn(b'line 1', err)
self.assertIn(b'y = 6\\', err)
if __name__ == "__main__":

17
Lib/test/test_source_encoding.py
View File

@ -205,6 +205,23 @@ class AbstractSourceEncodingTest:
b'print(ascii("\xc3\xa4"))\n')
self.check_script_output(src, br"'\xe4'")
def test_crlf(self):
src = (b'print(ascii("""\r\n"""))\n')
out = self.check_script_output(src, br"'\n'")
def test_crcrlf(self):
src = (b'print(ascii("""\r\r\n"""))\n')
out = self.check_script_output(src, br"'\n\n'")
def test_crcrcrlf(self):
src = (b'print(ascii("""\r\r\r\n"""))\n')
out = self.check_script_output(src, br"'\n\n\n'")
def test_crcrcrlf2(self):
src = (b'#coding:iso-8859-1\n'
b'print(ascii("""\r\r\r\n"""))\n')
out = self.check_script_output(src, br"'\n\n\n'")
class BytesSourceEncodingTest(AbstractSourceEncodingTest, unittest.TestCase):

688
Parser/tokenizer.c
View File

@ -13,7 +13,6 @@
#include "unicodeobject.h"
#include "bytesobject.h"
#include "fileobject.h"
#include "codecs.h"
#include "abstract.h"
/* Alternate tab spacing */
@ -75,7 +74,6 @@ tok_new(void)
tok->altindstack[0] = 0;
tok->decoding_state = STATE_INIT;
tok->decoding_erred = 0;
tok->read_coding_spec = 0;
tok->enc = NULL;
tok->encoding = NULL;
tok->cont_line = 0;
@ -164,14 +162,14 @@ get_coding_spec(const char *s, char **spec, Py_ssize_t size, struct tok_state *t
}
for (; i < size - 6; i++) { /* XXX inefficient search */
const char* t = s + i;
if (strncmp(t, "coding", 6) == 0) {
if (memcmp(t, "coding", 6) == 0) {
const char* begin = NULL;
t += 6;
if (t[0] != ':' && t[0] != '=')
continue;
do {
t++;
} while (t[0] == '\x20' || t[0] == '\t');
} while (t[0] == ' ' || t[0] == '\t');
begin = t;
while (Py_ISALNUM(t[0]) ||
@ -208,15 +206,14 @@ check_coding_spec(const char* line, Py_ssize_t size, struct tok_state *tok,
int set_readline(struct tok_state *, const char *))
{
char *cs;
int r = 1;
if (tok->cont_line) {
/* It's a continuation line, so it can't be a coding spec. */
tok->read_coding_spec = 1;
tok->decoding_state = STATE_NORMAL;
return 1;
}
if (!get_coding_spec(line, &cs, size, tok))
if (!get_coding_spec(line, &cs, size, tok)) {
return 0;
}
if (!cs) {
Py_ssize_t i;
for (i = 0; i < size; i++) {
@ -225,37 +222,33 @@ check_coding_spec(const char* line, Py_ssize_t size, struct tok_state *tok,
if (line[i] != ' ' && line[i] != '\t' && line[i] != '\014') {
/* Stop checking coding spec after a line containing
* anything except a comment. */
tok->read_coding_spec = 1;
tok->decoding_state = STATE_NORMAL;
break;
}
}
return 1;
}
tok->read_coding_spec = 1;
tok->decoding_state = STATE_NORMAL;
if (tok->encoding == NULL) {
assert(tok->decoding_state == STATE_RAW);
if (strcmp(cs, "utf-8") == 0) {
tok->encoding = cs;
} else {
r = set_readline(tok, cs);
if (r) {
tok->encoding = cs;
tok->decoding_state = STATE_NORMAL;
}
else {
PyErr_Format(PyExc_SyntaxError,
"encoding problem: %s", cs);
PyMem_Free(cs);
}
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 */
r = (strcmp(tok->encoding, cs) == 0);
if (!r)
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 r;
return 1;
}
/* See whether the file starts with a BOM. If it does,
@ -270,7 +263,7 @@ check_bom(int get_char(struct tok_state *),
{
int ch1, ch2, ch3;
ch1 = get_char(tok);
tok->decoding_state = STATE_RAW;
tok->decoding_state = STATE_SEEK_CODING;
if (ch1 == EOF) {
return 1;
} else if (ch1 == 0xEF) {
@ -324,7 +317,8 @@ check_bom(int get_char(struct tok_state *),
return 1;
}
static int tok_concatenate_interactive_new_line(struct tok_state* tok, char* line) {
static int
tok_concatenate_interactive_new_line(struct tok_state *tok, const char *line) {
assert(tok->fp_interactive);
if (!line) {
@ -360,73 +354,73 @@ static int tok_concatenate_interactive_new_line(struct tok_state* tok, char* lin
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 fp_readl did not have enough room
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, fp_readl is called in a loop (with an expanded buffer)
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 decoding_fgets.
reached): see tok_nextc and its calls to tok_reserve_buf.
*/
static char *
fp_readl(char *s, int size, struct tok_state *tok)
static int
tok_reserve_buf(struct tok_state *tok, Py_ssize_t size)
{
PyObject* bufobj;
const char *buf;
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;
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;
}
return 1;
}
static int
tok_readline_recode(struct tok_state *tok) {
PyObject *line;
const char *buf;
Py_ssize_t buflen;
/* Ask for one less byte so we can terminate it */
assert(size > 0);
size--;
if (tok->decoding_buffer) {
bufobj = tok->decoding_buffer;
Py_INCREF(bufobj);
}
else
{
bufobj = _PyObject_CallNoArg(tok->decoding_readline);
if (bufobj == NULL)
goto error;
}
if (PyUnicode_CheckExact(bufobj))
{
buf = PyUnicode_AsUTF8AndSize(bufobj, &buflen);
if (buf == NULL) {
line = tok->decoding_buffer;
if (line == NULL) {
line = PyObject_CallNoArgs(tok->decoding_readline);
if (line == NULL) {
error_ret(tok);
goto error;
}
}
else
{
buf = PyByteArray_AsString(bufobj);
if (buf == NULL) {
goto error;
}
buflen = PyByteArray_GET_SIZE(bufobj);
}
Py_XDECREF(tok->decoding_buffer);
if (buflen > size) {
/* Too many chars, the rest goes into tok->decoding_buffer */
tok->decoding_buffer = PyByteArray_FromStringAndSize(buf+size,
buflen-size);
if (tok->decoding_buffer == NULL)
goto error;
buflen = size;
}
else
else {
tok->decoding_buffer = NULL;
memcpy(s, buf, buflen);
s[buflen] = '\0';
if (buflen == 0) /* EOF */
s = NULL;
Py_DECREF(bufobj);
return s;
}
buf = PyUnicode_AsUTF8AndSize(line, &buflen);
if (buf == NULL) {
error_ret(tok);
goto error;
}
if (!tok_reserve_buf(tok, buflen + 1)) {
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(bufobj);
return error_ret(tok);
Py_XDECREF(line);
return 0;
}
/* Set the readline function for TOK to a StreamReader's
@ -527,88 +521,30 @@ static int valid_utf8(const unsigned char* s)
return length;
}
/* Read a line of input from TOK. Determine encoding
if necessary. */
static char *
decoding_fgets(char *s, int size, struct tok_state *tok)
static int
ensure_utf8(char *line, struct tok_state *tok)
{
char *line = NULL;
int badchar = 0;
for (;;) {
if (tok->decoding_state == STATE_NORMAL) {
/* We already have a codec associated with
this input. */
line = fp_readl(s, size, tok);
unsigned char *c;
int length;
for (c = (unsigned char *)line; *c; c += length) {
if (!(length = valid_utf8(c))) {
badchar = *c;
break;
} else if (tok->decoding_state == STATE_RAW) {
/* We want a 'raw' read. */
line = Py_UniversalNewlineFgets(s, size,
tok->fp, NULL);
break;
} else {
/* 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))
return error_ret(tok);
assert(tok->decoding_state != STATE_INIT);
}
}
if (line != NULL && tok->lineno < 2 && !tok->read_coding_spec) {
if (!check_coding_spec(line, strlen(line), tok, fp_setreadl)) {
return error_ret(tok);
}
}
/* The default encoding is UTF-8, so make sure we don't have any
non-UTF-8 sequences in it. */
if (line && !tok->encoding) {
unsigned char *c;
int length;
for (c = (unsigned char *)line; *c; c += length)
if (!(length = valid_utf8(c))) {
badchar = *c;
break;
}
}
if (badchar) {
/* Need to add 1 to the line number, since this line
has not been counted, yet. */
has not been counted, yet. */
PyErr_Format(PyExc_SyntaxError,
"Non-UTF-8 code starting with '\\x%.2x' "
"in file %U on line %i, "
"but no encoding declared; "
"see http://python.org/dev/peps/pep-0263/ for details",
badchar, tok->filename, tok->lineno + 1);
return error_ret(tok);
}
if (tok->fp_interactive &&
tok_concatenate_interactive_new_line(tok, line) == -1) {
return NULL;
}
return line;
}
static int
decoding_feof(struct tok_state *tok)
{
if (tok->decoding_state != STATE_NORMAL) {
return feof(tok->fp);
} else {
PyObject* buf = tok->decoding_buffer;
if (buf == NULL) {
buf = _PyObject_CallNoArg(tok->decoding_readline);
if (buf == NULL) {
error_ret(tok);
return 1;
} else {
tok->decoding_buffer = buf;
}
}
return PyObject_Length(buf) == 0;
"Non-UTF-8 code starting with '\\x%.2x' "
"in file %U on line %i, "
"but no encoding declared; "
"see http://python.org/dev/peps/pep-0263/ for details",
badchar, tok->filename, tok->lineno + 1);
return 0;
}
return 1;
}
/* Fetch a byte from TOK, using the string buffer. */
@ -736,12 +672,13 @@ decode_str(const char *input, int single, struct tok_state *tok)
/* 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 error_ret(tok);
if (tok->enc == NULL && !tok->read_coding_spec && newl[1]) {
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 error_ret(tok);
return NULL;
}
}
if (tok->enc != NULL) {
@ -777,6 +714,8 @@ PyTokenizer_FromString(const char *str, int exec_input)
return tok;
}
/* Set up tokenizer for UTF-8 string */
struct tok_state *
PyTokenizer_FromUTF8(const char *str, int exec_input)
{
@ -789,16 +728,14 @@ PyTokenizer_FromUTF8(const char *str, int exec_input)
PyTokenizer_Free(tok);
return NULL;
}
tok->decoding_state = STATE_RAW;
tok->read_coding_spec = 1;
tok->decoding_state = STATE_NORMAL;
tok->enc = NULL;
tok->str = translated;
tok->encoding = (char *)PyMem_Malloc(6);
tok->encoding = new_string("utf-8", 5, tok);
if (!tok->encoding) {
PyTokenizer_Free(tok);
return NULL;
}
strcpy(tok->encoding, "utf-8");
tok->buf = tok->cur = tok->inp = translated;
tok->end = translated;
@ -826,18 +763,16 @@ PyTokenizer_FromFile(FILE *fp, const char* enc,
if (enc != NULL) {
/* Must copy encoding declaration since it
gets copied into the parse tree. */
tok->encoding = PyMem_Malloc(strlen(enc)+1);
tok->encoding = new_string(enc, strlen(enc), tok);
if (!tok->encoding) {
PyTokenizer_Free(tok);
return NULL;
}
strcpy(tok->encoding, enc);
tok->decoding_state = STATE_NORMAL;
}
return tok;
}
/* Free a tok_state structure */
void
@ -861,11 +796,225 @@ PyTokenizer_Free(struct tok_state *tok)
PyMem_Free(tok);
}
static int
tok_readline_raw(struct tok_state *tok)
{
do {
if (!tok_reserve_buf(tok, BUFSIZ)) {
return 0;
}
char *line = Py_UniversalNewlineFgets(tok->inp,
(int)(tok->end - tok->inp),
tok->fp, NULL);
if (line == NULL) {
return 1;
}
if (tok->fp_interactive &&
tok_concatenate_interactive_new_line(tok, line) == -1) {
return 0;
}
tok->inp = strchr(tok->inp, '\0');
} while (tok->inp[-1] != '\n');
return 1;
}
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;
tok->lineno++;
tok->inp = end;
return 1;
}
static int
tok_underflow_interactive(struct tok_state *tok) {
char *newtok = PyOS_Readline(stdin, stdout, tok->prompt);
if (newtok != NULL) {
char *translated = translate_newlines(newtok, 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;
size_t size = strlen(newtok);
tok->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;
}
else {
tok->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;
}
if (tok->done != E_OK) {
if (tok->prompt != NULL) {
PySys_WriteStderr("\n");
}
return 0;
}
return 1;
}
static int
tok_underflow_file(struct tok_state *tok) {
if (tok->start == NULL) {
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;
}
if (tok->inp[-1] != '\n') {
/* Last line does not end in \n, fake one */
*tok->inp++ = '\n';
*tok->inp = '\0';
}
tok->lineno++;
if (tok->decoding_state != STATE_NORMAL) {
if (tok->lineno > 2) {
tok->decoding_state = STATE_NORMAL;
}
else if (!check_coding_spec(tok->cur, tok->end - 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
&& (tok->decoding_state != STATE_NORMAL || tok->lineno >= 2)) {
if (!ensure_utf8(tok->cur, tok)) {
error_ret(tok);
return 0;
}
}
assert(tok->done == E_OK);
return tok->done == E_OK;
}
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);
}
/* 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) {
return Py_CHARMASK(*tok->cur++); /* Fast path */
@ -873,200 +1022,28 @@ tok_nextc(struct tok_state *tok)
if (tok->done != E_OK)
return EOF;
if (tok->fp == NULL) {
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 EOF;
}
}
if (tok->start == NULL)
tok->buf = tok->cur;
tok->line_start = tok->cur;
tok->lineno++;
tok->inp = end;
return Py_CHARMASK(*tok->cur++);
rc = tok_underflow_string(tok);
}
if (tok->prompt != NULL) {
char *newtok = PyOS_Readline(stdin, stdout, tok->prompt);
if (newtok != NULL) {
char *translated = translate_newlines(newtok, 0, tok);
PyMem_Free(newtok);
if (translated == NULL)
return EOF;
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) {
tok->done = E_DECODE;
return EOF;
}
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 EOF;
}
strcpy(newtok, buf);
Py_DECREF(u);
}
if (tok->fp_interactive &&
tok_concatenate_interactive_new_line(tok, newtok) == -1) {
return EOF;
}
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) {
size_t start = tok->start - tok->buf;
size_t oldlen = tok->cur - tok->buf;
size_t newlen = oldlen + strlen(newtok);
Py_ssize_t cur_multi_line_start = tok->multi_line_start - tok->buf;
char *buf = tok->buf;
buf = (char *)PyMem_Realloc(buf, newlen+1);
tok->lineno++;
if (buf == NULL) {
PyMem_Free(tok->buf);
tok->buf = NULL;
PyMem_Free(newtok);
tok->done = E_NOMEM;
return EOF;
}
tok->buf = buf;
tok->cur = tok->buf + oldlen;
tok->multi_line_start = tok->buf + cur_multi_line_start;
tok->line_start = tok->cur;
strcpy(tok->buf + oldlen, newtok);
PyMem_Free(newtok);
tok->inp = tok->buf + newlen;
tok->end = tok->inp + 1;
tok->start = tok->buf + start;
}
else {
tok->lineno++;
if (tok->buf != NULL)
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;
}
else if (tok->prompt != NULL) {
rc = tok_underflow_interactive(tok);
}
else {
int done = 0;
Py_ssize_t cur = 0;
char *pt;
if (tok->start == NULL) {
if (tok->buf == NULL) {
tok->buf = (char *)
PyMem_Malloc(BUFSIZ);
if (tok->buf == NULL) {
tok->done = E_NOMEM;
return EOF;
}
tok->end = tok->buf + BUFSIZ;
}
if (decoding_fgets(tok->buf, (int)(tok->end - tok->buf),
tok) == NULL) {
if (!tok->decoding_erred && !(tok->done == E_NOMEM))
tok->done = E_EOF;
done = 1;
}
else {
tok->done = E_OK;
tok->inp = strchr(tok->buf, '\0');
done = tok->inp == tok->buf || tok->inp[-1] == '\n';
}
}
else {
cur = tok->cur - tok->buf;
if (decoding_feof(tok)) {
tok->done = E_EOF;
done = 1;
}
else
tok->done = E_OK;
}
tok->lineno++;
/* Read until '\n' or EOF */
while (!done) {
Py_ssize_t curstart = tok->start == NULL ? -1 :
tok->start - tok->buf;
Py_ssize_t cur_multi_line_start = tok->multi_line_start - tok->buf;
Py_ssize_t curvalid = tok->inp - tok->buf;
Py_ssize_t newsize = curvalid + BUFSIZ;
char *newbuf = tok->buf;
newbuf = (char *)PyMem_Realloc(newbuf,
newsize);
if (newbuf == NULL) {
tok->done = E_NOMEM;
tok->cur = tok->inp;
return EOF;
}
tok->buf = newbuf;
tok->cur = tok->buf + cur;
tok->multi_line_start = tok->buf + cur_multi_line_start;
tok->line_start = tok->cur;
tok->inp = tok->buf + curvalid;
tok->end = tok->buf + newsize;
tok->start = curstart < 0 ? NULL :
tok->buf + curstart;
if (decoding_fgets(tok->inp,
(int)(tok->end - tok->inp),
tok) == NULL) {
/* Break out early on decoding
errors, as tok->buf will be NULL
*/
if (tok->decoding_erred)
return EOF;
/* Last line does not end in \n,
fake one */
if (tok->inp[-1] != '\n')
strcpy(tok->inp, "\n");
}
tok->inp = strchr(tok->inp, '\0');
done = tok->inp[-1] == '\n';
}
if (tok->buf != NULL) {
tok->cur = tok->buf + cur;
tok->line_start = tok->cur;
/* replace "\r\n" with "\n" */
/* For Mac leave the \r, giving a syntax error */
pt = tok->inp - 2;
if (pt >= tok->buf && *pt == '\r') {
*pt++ = '\n';
*pt = '\0';
tok->inp = pt;
}
}
rc = tok_underflow_file(tok);
}
if (tok->done != E_OK) {
if (tok->prompt != NULL)
PySys_WriteStderr("\n");
if (Py_DebugFlag) {
printf("line[%d] = ", tok->lineno);
print_escape(stdout, tok->cur, tok->inp - tok->cur);
printf(" tok->done = %d\n", tok->done);
}
if (!rc) {
tok->cur = tok->inp;
return EOF;
}
tok->line_start = tok->cur;
}
/*NOTREACHED*/
Py_UNREACHABLE();
}
/* Back-up one character */
static void
@ -1076,8 +1053,8 @@ tok_backup(struct tok_state *tok, int c)
if (--tok->cur < tok->buf) {
Py_FatalError("tokenizer beginning of buffer");
}
if (*tok->cur != c) {
*tok->cur = c;
if ((int)(unsigned char)*tok->cur != c) {
Py_FatalError("tok_backup: wrong character");
}
}
}
@ -1951,8 +1928,9 @@ PyTokenizer_FindEncodingFilename(int fd, PyObject *filename)
fclose(fp);
if (tok->encoding) {
encoding = (char *)PyMem_Malloc(strlen(tok->encoding) + 1);
if (encoding)
if (encoding) {
strcpy(encoding, tok->encoding);
}
}
PyTokenizer_Free(tok);
return encoding;

5
Parser/tokenizer.h
View File

@ -15,8 +15,8 @@ extern "C" {
enum decoding_state {
STATE_INIT,
STATE_RAW,
STATE_NORMAL /* have a codec associated with input */
STATE_SEEK_CODING,
STATE_NORMAL
};
/* Tokenizer state */
@ -54,7 +54,6 @@ struct tok_state {
/* Stuff for PEP 0263 */
enum decoding_state decoding_state;
int decoding_erred; /* whether erred in decoding */
int read_coding_spec; /* whether 'coding:...' has been read */
char *encoding; /* Source encoding. */
int cont_line; /* whether we are in a continuation line. */
const char* line_start; /* pointer to start of current line */