/src/cpython/Parser/tokenizer/helpers.c

Source (jump to first uncovered line)
#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(
        "\"\\%c\" is an invalid escape sequence. "
        "Such sequences will not work in the future. "
        "Did you mean \"\\\\%c\"? A raw string is also an option.",
        (char) first_invalid_escape_char,
        (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,
                "\"\\%c\" is an invalid escape sequence. "
                "Did you mean \"\\\\%c\"? A raw string is also an option.",
                (char) first_invalid_escape_char,
                (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

Coverage Report

Created: 2025-07-04 06:49

Line	Count	Source (jump to first uncovered line)
1		#include "Python.h"
2		#include "errcode.h"
3		#include "pycore_token.h"
4
5		#include "../lexer/state.h"
6
7
8		/* ############## ERRORS ############## */
9
10		static int
11		_syntaxerror_range(struct tok_state tok, const char format,
12		int col_offset, int end_col_offset,
13		va_list vargs)
14	2.68k	{
15		// In release builds, we don't want to overwrite a previous error, but in debug builds we
16		// want to fail if we are not doing it so we can fix it.
17	2.68k	assert(tok->done != E_ERROR);
18	2.68k	if (tok->done == E_ERROR) {
19	0	return ERRORTOKEN;
20	0	}
21	2.68k	PyObject errmsg, errtext, *args;
22	2.68k	errmsg = PyUnicode_FromFormatV(format, vargs);
23	2.68k	if (!errmsg) {
24	0	goto error;
25	0	}
26
27	2.68k	errtext = PyUnicode_DecodeUTF8(tok->line_start, tok->cur - tok->line_start,
28	2.68k	"replace");
29	2.68k	if (!errtext) {
30	0	goto error;
31	0	}
32
33	2.68k	if (col_offset == -1) {
34	2.65k	col_offset = (int)PyUnicode_GET_LENGTH(errtext);
35	2.65k	}
36	2.68k	if (end_col_offset == -1) {
37	2.65k	end_col_offset = col_offset;
38	2.65k	}
39
40	2.68k	Py_ssize_t line_len = strcspn(tok->line_start, "\n");
41	2.68k	if (line_len != tok->cur - tok->line_start) {
42	1.94k	Py_DECREF(errtext);
43	1.94k	errtext = PyUnicode_DecodeUTF8(tok->line_start, line_len,
44	1.94k	"replace");
45	1.94k	}
46	2.68k	if (!errtext) {
47	0	goto error;
48	0	}
49
50	2.68k	args = Py_BuildValue("(O(OiiNii))", errmsg, tok->filename, tok->lineno,
51	2.68k	col_offset, errtext, tok->lineno, end_col_offset);
52	2.68k	if (args) {
53	2.68k	PyErr_SetObject(PyExc_SyntaxError, args);
54	2.68k	Py_DECREF(args);
55	2.68k	}
56
57	2.68k	error:
58	2.68k	Py_XDECREF(errmsg);
59	2.68k	tok->done = E_ERROR;
60	2.68k	return ERRORTOKEN;
61	2.68k	}
62
63		int
64		_PyTokenizer_syntaxerror(struct tok_state tok, const char format, ...)
65	2.65k	{
66		// This errors are cleaned on startup. Todo: Fix it.
67	2.65k	va_list vargs;
68	2.65k	va_start(vargs, format);
69	2.65k	int ret = _syntaxerror_range(tok, format, -1, -1, vargs);
70	2.65k	va_end(vargs);
71	2.65k	return ret;
72	2.65k	}
73
74		int
75		_PyTokenizer_syntaxerror_known_range(struct tok_state *tok,
76		int col_offset, int end_col_offset,
77		const char *format, ...)
78	32	{
79	32	va_list vargs;
80	32	va_start(vargs, format);
81	32	int ret = _syntaxerror_range(tok, format, col_offset, end_col_offset, vargs);
82	32	va_end(vargs);
83	32	return ret;
84	32	}
85
86		int
87		_PyTokenizer_indenterror(struct tok_state *tok)
88	5	{
89	5	tok->done = E_TABSPACE;
90	5	tok->cur = tok->inp;
91	5	return ERRORTOKEN;
92	5	}
93
94		char *
95		_PyTokenizer_error_ret(struct tok_state tok) / XXX */
96	1.84k	{
97	1.84k	tok->decoding_erred = 1;
98	1.84k	if ((tok->fp != NULL \|\| tok->readline != NULL) && tok->buf != NULL) {/* see _PyTokenizer_Free */
99	0	PyMem_Free(tok->buf);
100	0	}
101	1.84k	tok->buf = tok->cur = tok->inp = NULL;
102	1.84k	tok->start = NULL;
103	1.84k	tok->end = NULL;
104	1.84k	tok->done = E_DECODE;
105	1.84k	return NULL; /* as if it were EOF */
106	1.84k	}
107
108		int
109		_PyTokenizer_warn_invalid_escape_sequence(struct tok_state *tok, int first_invalid_escape_char)
110	1.15k	{
111	1.15k	if (!tok->report_warnings) {
112	0	return 0;
113	0	}
114
115	1.15k	PyObject *msg = PyUnicode_FromFormat(
116	1.15k	"\"\\%c\" is an invalid escape sequence. "
117	1.15k	"Such sequences will not work in the future. "
118	1.15k	"Did you mean \"\\\\%c\"? A raw string is also an option.",
119	1.15k	(char) first_invalid_escape_char,
120	1.15k	(char) first_invalid_escape_char
121	1.15k	);
122
123	1.15k	if (msg == NULL) {
124	0	return -1;
125	0	}
126
127	1.15k	if (PyErr_WarnExplicitObject(PyExc_SyntaxWarning, msg, tok->filename,
128	1.15k	tok->lineno, NULL, NULL) < 0) {
129	0	Py_DECREF(msg);
130
131	0	if (PyErr_ExceptionMatches(PyExc_SyntaxWarning)) {
132		/* Replace the SyntaxWarning exception with a SyntaxError
133		to get a more accurate error report */
134	0	PyErr_Clear();
135
136	0	return _PyTokenizer_syntaxerror(tok,
137	0	"\"\\%c\" is an invalid escape sequence. "
138	0	"Did you mean \"\\\\%c\"? A raw string is also an option.",
139	0	(char) first_invalid_escape_char,
140	0	(char) first_invalid_escape_char);
141	0	}
142
143	0	return -1;
144	0	}
145
146	1.15k	Py_DECREF(msg);
147	1.15k	return 0;
148	1.15k	}
149
150		int
151		_PyTokenizer_parser_warn(struct tok_state tok, PyObject category, const char *format, ...)
152	10.6k	{
153	10.6k	if (!tok->report_warnings) {
154	0	return 0;
155	0	}
156
157	10.6k	PyObject *errmsg;
158	10.6k	va_list vargs;
159	10.6k	va_start(vargs, format);
160	10.6k	errmsg = PyUnicode_FromFormatV(format, vargs);
161	10.6k	va_end(vargs);
162	10.6k	if (!errmsg) {
163	0	goto error;
164	0	}
165
166	10.6k	if (PyErr_WarnExplicitObject(category, errmsg, tok->filename,
167	10.6k	tok->lineno, NULL, NULL) < 0) {
168	0	if (PyErr_ExceptionMatches(category)) {
169		/* Replace the DeprecationWarning exception with a SyntaxError
170		to get a more accurate error report */
171	0	PyErr_Clear();
172	0	_PyTokenizer_syntaxerror(tok, "%U", errmsg);
173	0	}
174	0	goto error;
175	0	}
176	10.6k	Py_DECREF(errmsg);
177	10.6k	return 0;
178
179	0	error:
180	0	Py_XDECREF(errmsg);
181	0	tok->done = E_ERROR;
182	0	return -1;
183	10.6k	}
184
185
186		/* ############## STRING MANIPULATION ############## */
187
188		char *
189		_PyTokenizer_new_string(const char s, Py_ssize_t len, struct tok_state tok)
190	4.40k	{
191	4.40k	char* result = (char *)PyMem_Malloc(len + 1);
192	4.40k	if (!result) {
193	0	tok->done = E_NOMEM;
194	0	return NULL;
195	0	}
196	4.40k	memcpy(result, s, len);
197	4.40k	result[len] = '\0';
198	4.40k	return result;
199	4.40k	}
200
201		PyObject *
202	4.33k	_PyTokenizer_translate_into_utf8(const char* str, const char* enc) {
203	4.33k	PyObject *utf8;
204	4.33k	PyObject* buf = PyUnicode_Decode(str, strlen(str), enc, NULL);
205	4.33k	if (buf == NULL)
206	1.78k	return NULL;
207	2.55k	utf8 = PyUnicode_AsUTF8String(buf);
208	2.55k	Py_DECREF(buf);
209	2.55k	return utf8;
210	4.33k	}
211
212		char *
213		_PyTokenizer_translate_newlines(const char *s, int exec_input, int preserve_crlf,
214	23.4k	struct tok_state *tok) {
215	23.4k	int skip_next_lf = 0;
216	23.4k	size_t needed_length = strlen(s) + 2, final_length;
217	23.4k	char buf, current;
218	23.4k	char c = '\0';
219	23.4k	buf = PyMem_Malloc(needed_length);
220	23.4k	if (buf == NULL) {
221	0	tok->done = E_NOMEM;
222	0	return NULL;
223	0	}
224	6.98M	for (current = buf; *s; s++, current++) {
225	6.96M	c = *s;
226	6.96M	if (skip_next_lf) {
227	12.4k	skip_next_lf = 0;
228	12.4k	if (c == '\n') {
229	261	c = *++s;
230	261	if (!c)
231	2	break;
232	261	}
233	12.4k	}
234	6.96M	if (!preserve_crlf && c == '\r') {
235	12.4k	skip_next_lf = 1;
236	12.4k	c = '\n';
237	12.4k	}
238	6.96M	*current = c;
239	6.96M	}
240		/* If this is exec input, add a newline to the end of the string if
241		there isn't one already. */
242	23.4k	if (exec_input && c != '\n' && c != '\0') {
243	22.7k	*current = '\n';
244	22.7k	current++;
245	22.7k	}
246	23.4k	*current = '\0';
247	23.4k	final_length = current - buf + 1;
248	23.4k	if (final_length < needed_length && final_length) {
249		/* should never fail */
250	677	char* result = PyMem_Realloc(buf, final_length);
251	677	if (result == NULL) {
252	0	PyMem_Free(buf);
253	0	}
254	677	buf = result;
255	677	}
256	23.4k	return buf;
257	23.4k	}
258
259		/* ############## ENCODING STUFF ############## */
260
261
262		/* See whether the file starts with a BOM. If it does,
263		invoke the set_readline function with the new encoding.
264		Return 1 on success, 0 on failure. */
265		int
266		_PyTokenizer_check_bom(int get_char(struct tok_state *),
267		void unget_char(int, struct tok_state *),
268		int set_readline(struct tok_state , const char ),
269		struct tok_state *tok)
270	23.3k	{
271	23.3k	int ch1, ch2, ch3;
272	23.3k	ch1 = get_char(tok);
273	23.3k	tok->decoding_state = STATE_SEEK_CODING;
274	23.3k	if (ch1 == EOF) {
275	0	return 1;
276	23.3k	} else if (ch1 == 0xEF) {
277	97	ch2 = get_char(tok);
278	97	if (ch2 != 0xBB) {
279	87	unget_char(ch2, tok);
280	87	unget_char(ch1, tok);
281	87	return 1;
282	87	}
283	10	ch3 = get_char(tok);
284	10	if (ch3 != 0xBF) {
285	4	unget_char(ch3, tok);
286	4	unget_char(ch2, tok);
287	4	unget_char(ch1, tok);
288	4	return 1;
289	4	}
290	23.2k	} else {
291	23.2k	unget_char(ch1, tok);
292	23.2k	return 1;
293	23.2k	}
294	6	if (tok->encoding != NULL)
295	0	PyMem_Free(tok->encoding);
296	6	tok->encoding = _PyTokenizer_new_string("utf-8", 5, tok);
297	6	if (!tok->encoding)
298	0	return 0;
299		/* No need to set_readline: input is already utf-8 */
300	6	return 1;
301	6	}
302
303		static const char *
304		get_normal_name(const char s) / for utf-8 and latin-1 */
305	4.33k	{
306	4.33k	char buf[13];
307	4.33k	int i;
308	27.9k	for (i = 0; i < 12; i++) {
309	27.6k	int c = s[i];
310	27.6k	if (c == '\0')
311	4.09k	break;
312	23.5k	else if (c == '_')
313	686	buf[i] = '-';
314	22.8k	else
315	22.8k	buf[i] = Py_TOLOWER(c);
316	27.6k	}
317	4.33k	buf[i] = '\0';
318	4.33k	if (strcmp(buf, "utf-8") == 0 \|\|
319	4.33k	strncmp(buf, "utf-8-", 6) == 0)
320	3	return "utf-8";
321	4.33k	else if (strcmp(buf, "latin-1") == 0 \|\|
322	4.33k	strcmp(buf, "iso-8859-1") == 0 \|\|
323	4.33k	strcmp(buf, "iso-latin-1") == 0 \|\|
324	4.33k	strncmp(buf, "latin-1-", 8) == 0 \|\|
325	4.33k	strncmp(buf, "iso-8859-1-", 11) == 0 \|\|
326	4.33k	strncmp(buf, "iso-latin-1-", 12) == 0)
327	15	return "iso-8859-1";
328	4.32k	else
329	4.32k	return s;
330	4.33k	}
331
332		/* Return the coding spec in S, or NULL if none is found. */
333		static int
334		get_coding_spec(const char s, char spec, Py_ssize_t size, struct tok_state tok)
335	24.1k	{
336	24.1k	Py_ssize_t i;
337	24.1k	*spec = NULL;
338		/* Coding spec must be in a comment, and that comment must be
339		* the only statement on the source code line. */
340	30.3k	for (i = 0; i < size - 6; i++) {
341	24.7k	if (s[i] == '#')
342	4.64k	break;
343	20.1k	if (s[i] != ' ' && s[i] != '\t' && s[i] != '\014')
344	13.9k	return 1;
345	20.1k	}
346	206k	for (; i < size - 6; i++) { /* XXX inefficient search */
347	200k	const char* t = s + i;
348	200k	if (memcmp(t, "coding", 6) == 0) {
349	4.96k	const char* begin = NULL;
350	4.96k	t += 6;
351	4.96k	if (t[0] != ':' && t[0] != '=')
352	222	continue;
353	5.46k	do {
354	5.46k	t++;
355	5.46k	} while (t[0] == ' ' \|\| t[0] == '\t');
356
357	4.73k	begin = t;
358	33.9k	while (Py_ISALNUM(t[0]) \|\|
359	33.9k	t[0] == '-' \|\| t[0] == '_' \|\| t[0] == '.')
360	29.1k	t++;
361
362	4.73k	if (begin < t) {
363	4.33k	char* r = _PyTokenizer_new_string(begin, t - begin, tok);
364	4.33k	const char* q;
365	4.33k	if (!r)
366	0	return 0;
367	4.33k	q = get_normal_name(r);
368	4.33k	if (r != q) {
369	18	PyMem_Free(r);
370	18	r = _PyTokenizer_new_string(q, strlen(q), tok);
371	18	if (!r)
372	0	return 0;
373	18	}
374	4.33k	*spec = r;
375	4.33k	break;
376	4.33k	}
377	4.73k	}
378	200k	}
379	10.2k	return 1;
380	10.2k	}
381
382		/* Check whether the line contains a coding spec. If it does,
383		invoke the set_readline function for the new encoding.
384		This function receives the tok_state and the new encoding.
385		Return 1 on success, 0 on failure. */
386		int
387		_PyTokenizer_check_coding_spec(const char* line, Py_ssize_t size, struct tok_state *tok,
388		int set_readline(struct tok_state , const char ))
389	24.1k	{
390	24.1k	char *cs;
391	24.1k	if (tok->cont_line) {
392		/* It's a continuation line, so it can't be a coding spec. */
393	0	tok->decoding_state = STATE_NORMAL;
394	0	return 1;
395	0	}
396	24.1k	if (!get_coding_spec(line, &cs, size, tok)) {
397	0	return 0;
398	0	}
399	24.1k	if (!cs) {
400	19.8k	Py_ssize_t i;
401	26.2k	for (i = 0; i < size; i++) {
402	25.7k	if (line[i] == '#' \|\| line[i] == '\n' \|\| line[i] == '\r')
403	708	break;
404	25.0k	if (line[i] != ' ' && line[i] != '\t' && line[i] != '\014') {
405		/* Stop checking coding spec after a line containing
406		* anything except a comment. */
407	18.7k	tok->decoding_state = STATE_NORMAL;
408	18.7k	break;
409	18.7k	}
410	25.0k	}
411	19.8k	return 1;
412	19.8k	}
413	4.33k	tok->decoding_state = STATE_NORMAL;
414	4.33k	if (tok->encoding == NULL) {
415	4.33k	assert(tok->decoding_readline == NULL);
416	4.33k	if (strcmp(cs, "utf-8") != 0 && !set_readline(tok, cs)) {
417	0	_PyTokenizer_error_ret(tok);
418	0	PyErr_Format(PyExc_SyntaxError, "encoding problem: %s", cs);
419	0	PyMem_Free(cs);
420	0	return 0;
421	0	}
422	4.33k	tok->encoding = cs;
423	4.33k	} else { /* then, compare cs with BOM */
424	4	if (strcmp(tok->encoding, cs) != 0) {
425	3	_PyTokenizer_error_ret(tok);
426	3	PyErr_Format(PyExc_SyntaxError,
427	3	"encoding problem: %s with BOM", cs);
428	3	PyMem_Free(cs);
429	3	return 0;
430	3	}
431	1	PyMem_Free(cs);
432	1	}
433	4.33k	return 1;
434	4.33k	}
435
436		/* Check whether the characters at s start a valid
437		UTF-8 sequence. Return the number of characters forming
438		the sequence if yes, 0 if not. The special cases match
439		those in stringlib/codecs.h:utf8_decode.
440		*/
441		static int
442		valid_utf8(const unsigned char* s)
443	0	{
444	0	int expected = 0;
445	0	int length;
446	0	if (*s < 0x80) {
447		/* single-byte code */
448	0	return 1;
449	0	}
450	0	else if (*s < 0xE0) {
451		/* \xC2\x80-\xDF\xBF -- 0080-07FF */
452	0	if (*s < 0xC2) {
453		/* invalid sequence
454		\x80-\xBF -- continuation byte
455		\xC0-\xC1 -- fake 0000-007F */
456	0	return 0;
457	0	}
458	0	expected = 1;
459	0	}
460	0	else if (*s < 0xF0) {
461		/* \xE0\xA0\x80-\xEF\xBF\xBF -- 0800-FFFF */
462	0	if (s == 0xE0 && (s + 1) < 0xA0) {
463		/* invalid sequence
464		\xE0\x80\x80-\xE0\x9F\xBF -- fake 0000-0800 */
465	0	return 0;
466	0	}
467	0	else if (s == 0xED && (s + 1) >= 0xA0) {
468		/* Decoding UTF-8 sequences in range \xED\xA0\x80-\xED\xBF\xBF
469		will result in surrogates in range D800-DFFF. Surrogates are
470		not valid UTF-8 so they are rejected.
471		See https://www.unicode.org/versions/Unicode5.2.0/ch03.pdf
472		(table 3-7) and http://www.rfc-editor.org/rfc/rfc3629.txt */
473	0	return 0;
474	0	}
475	0	expected = 2;
476	0	}
477	0	else if (*s < 0xF5) {
478		/* \xF0\x90\x80\x80-\xF4\x8F\xBF\xBF -- 10000-10FFFF */
479	0	if ((s + 1) < 0x90 ? s == 0xF0 : *s == 0xF4) {
480		/* invalid sequence -- one of:
481		\xF0\x80\x80\x80-\xF0\x8F\xBF\xBF -- fake 0000-FFFF
482		\xF4\x90\x80\x80- -- 110000- overflow */
483	0	return 0;
484	0	}
485	0	expected = 3;
486	0	}
487	0	else {
488		/* invalid start byte */
489	0	return 0;
490	0	}
491	0	length = expected + 1;
492	0	for (; expected; expected--)
493	0	if (s[expected] < 0x80 \|\| s[expected] >= 0xC0)
494	0	return 0;
495	0	return length;
496	0	}
497
498		int
499		_PyTokenizer_ensure_utf8(char line, struct tok_state tok)
500	0	{
501	0	int badchar = 0;
502	0	unsigned char *c;
503	0	int length;
504	0	for (c = (unsigned char )line; c; c += length) {
505	0	if (!(length = valid_utf8(c))) {
506	0	badchar = *c;
507	0	break;
508	0	}
509	0	}
510	0	if (badchar) {
511	0	PyErr_Format(PyExc_SyntaxError,
512	0	"Non-UTF-8 code starting with '\\x%.2x' "
513	0	"in file %U on line %i, "
514	0	"but no encoding declared; "
515	0	"see https://peps.python.org/pep-0263/ for details",
516	0	badchar, tok->filename, tok->lineno);
517	0	return 0;
518	0	}
519	0	return 1;
520	0	}
521
522
523		/* ############## DEBUGGING STUFF ############## */
524
525		#ifdef Py_DEBUG
526		void
527		_PyTokenizer_print_escape(FILE f, const char s, Py_ssize_t size)
528		{
529		if (s == NULL) {
530		fputs("NULL", f);
531		return;
532		}
533		putc('"', f);
534		while (size-- > 0) {
535		unsigned char c = *s++;
536		switch (c) {
537		case '\n': fputs("\\n", f); break;
538		case '\r': fputs("\\r", f); break;
539		case '\t': fputs("\\t", f); break;
540		case '\f': fputs("\\f", f); break;
541		case '\'': fputs("\\'", f); break;
542		case '"': fputs("\\\"", f); break;
543		default:
544		if (0x20 <= c && c <= 0x7f)
545		putc(c, f);
546		else
547		fprintf(f, "\\x%02x", c);
548		}
549		}
550		putc('"', f);
551		}
552
553		void
554		_PyTokenizer_tok_dump(int type, char start, char end)
555		{
556		fprintf(stderr, "%s", _PyParser_TokenNames[type]);
557		if (type == NAME \|\| type == NUMBER \|\| type == STRING \|\| type == OP)
558		fprintf(stderr, "(%.*s)", (int)(end - start), start);
559		}
560		#endif