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

Source
#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->filename : Py_None,
                         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) {
            tok->line_start = line;
            tok->cur = (char *)line;
            assert(size <= INT_MAX);
            _PyTokenizer_syntaxerror_known_range(tok, 0, (int)size,
                        "encoding problem: %s with BOM", cs);
            PyMem_Free(cs);
            _PyTokenizer_error_ret(tok);
            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(const char *line, struct tok_state *tok, int lineno)
{
    const char *badchar = NULL;
    const char *c;
    int length;
    int col_offset = 0;
    const char *line_start = line;
    for (c = line; *c; c += length) {
        if (!(length = valid_utf8((const unsigned char *)c))) {
            badchar = c;
            break;
        }
        col_offset++;
        if (*c == '\n') {
            lineno++;
            col_offset = 0;
            line_start = c + 1;
        }
    }
    if (badchar) {
        tok->lineno = lineno;
        tok->line_start = line_start;
        tok->cur = (char *)badchar;
        _PyTokenizer_syntaxerror_known_range(tok,
                col_offset + 1, col_offset + 1,
                "Non-UTF-8 code starting with '\\x%.2x'"
                "%s%V on line %i, "
                "but no encoding declared; "
                "see https://peps.python.org/pep-0263/ for details",
                (unsigned char)*badchar,
                tok->filename ? " in file " : "", tok->filename, "",
                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: 2025-10-12 06:48

Line	Count	Source
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	3.04k	{
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	3.04k	assert(tok->done != E_ERROR);
18	3.04k	if (tok->done == E_ERROR) {
19	0	return ERRORTOKEN;
20	0	}
21	3.04k	PyObject errmsg, errtext, *args;
22	3.04k	errmsg = PyUnicode_FromFormatV(format, vargs);
23	3.04k	if (!errmsg) {
24	0	goto error;
25	0	}
26
27	3.04k	errtext = PyUnicode_DecodeUTF8(tok->line_start, tok->cur - tok->line_start,
28	3.04k	"replace");
29	3.04k	if (!errtext) {
30	0	goto error;
31	0	}
32
33	3.04k	if (col_offset == -1) {
34	2.40k	col_offset = (int)PyUnicode_GET_LENGTH(errtext);
35	2.40k	}
36	3.04k	if (end_col_offset == -1) {
37	2.40k	end_col_offset = col_offset;
38	2.40k	}
39
40	3.04k	Py_ssize_t line_len = strcspn(tok->line_start, "\n");
41	3.04k	if (line_len != tok->cur - tok->line_start) {
42	2.29k	Py_DECREF(errtext);
43	2.29k	errtext = PyUnicode_DecodeUTF8(tok->line_start, line_len,
44	2.29k	"replace");
45	2.29k	}
46	3.04k	if (!errtext) {
47	0	goto error;
48	0	}
49
50	3.04k	args = Py_BuildValue("(O(OiiNii))", errmsg,
51	3.04k	tok->filename ? tok->filename : Py_None,
52	3.04k	tok->lineno, col_offset, errtext,
53	3.04k	tok->lineno, end_col_offset);
54	3.04k	if (args) {
55	3.04k	PyErr_SetObject(PyExc_SyntaxError, args);
56	3.04k	Py_DECREF(args);
57	3.04k	}
58
59	3.04k	error:
60	3.04k	Py_XDECREF(errmsg);
61	3.04k	tok->done = E_ERROR;
62	3.04k	return ERRORTOKEN;
63	3.04k	}
64
65		int
66		_PyTokenizer_syntaxerror(struct tok_state tok, const char format, ...)
67	2.40k	{
68		// This errors are cleaned on startup. Todo: Fix it.
69	2.40k	va_list vargs;
70	2.40k	va_start(vargs, format);
71	2.40k	int ret = _syntaxerror_range(tok, format, -1, -1, vargs);
72	2.40k	va_end(vargs);
73	2.40k	return ret;
74	2.40k	}
75
76		int
77		_PyTokenizer_syntaxerror_known_range(struct tok_state *tok,
78		int col_offset, int end_col_offset,
79		const char *format, ...)
80	635	{
81	635	va_list vargs;
82	635	va_start(vargs, format);
83	635	int ret = _syntaxerror_range(tok, format, col_offset, end_col_offset, vargs);
84	635	va_end(vargs);
85	635	return ret;
86	635	}
87
88		int
89		_PyTokenizer_indenterror(struct tok_state *tok)
90	4	{
91	4	tok->done = E_TABSPACE;
92	4	tok->cur = tok->inp;
93	4	return ERRORTOKEN;
94	4	}
95
96		char *
97		_PyTokenizer_error_ret(struct tok_state tok) / XXX */
98	2.63k	{
99	2.63k	tok->decoding_erred = 1;
100	2.63k	if ((tok->fp != NULL \|\| tok->readline != NULL) && tok->buf != NULL) {/* see _PyTokenizer_Free */
101	0	PyMem_Free(tok->buf);
102	0	}
103	2.63k	tok->buf = tok->cur = tok->inp = NULL;
104	2.63k	tok->start = NULL;
105	2.63k	tok->end = NULL;
106	2.63k	tok->done = E_DECODE;
107	2.63k	return NULL; /* as if it were EOF */
108	2.63k	}
109
110		int
111		_PyTokenizer_warn_invalid_escape_sequence(struct tok_state *tok, int first_invalid_escape_char)
112	1.18k	{
113	1.18k	if (!tok->report_warnings) {
114	0	return 0;
115	0	}
116
117	1.18k	PyObject *msg = PyUnicode_FromFormat(
118	1.18k	"\"\\%c\" is an invalid escape sequence. "
119	1.18k	"Such sequences will not work in the future. "
120	1.18k	"Did you mean \"\\\\%c\"? A raw string is also an option.",
121	1.18k	(char) first_invalid_escape_char,
122	1.18k	(char) first_invalid_escape_char
123	1.18k	);
124
125	1.18k	if (msg == NULL) {
126	0	return -1;
127	0	}
128
129	1.18k	if (PyErr_WarnExplicitObject(PyExc_SyntaxWarning, msg, tok->filename,
130	1.18k	tok->lineno, NULL, NULL) < 0) {
131	1	Py_DECREF(msg);
132
133	1	if (PyErr_ExceptionMatches(PyExc_SyntaxWarning)) {
134		/* Replace the SyntaxWarning exception with a SyntaxError
135		to get a more accurate error report */
136	0	PyErr_Clear();
137
138	0	return _PyTokenizer_syntaxerror(tok,
139	0	"\"\\%c\" is an invalid escape sequence. "
140	0	"Did you mean \"\\\\%c\"? A raw string is also an option.",
141	0	(char) first_invalid_escape_char,
142	0	(char) first_invalid_escape_char);
143	0	}
144
145	1	return -1;
146	1	}
147
148	1.18k	Py_DECREF(msg);
149	1.18k	return 0;
150	1.18k	}
151
152		int
153		_PyTokenizer_parser_warn(struct tok_state tok, PyObject category, const char *format, ...)
154	10.5k	{
155	10.5k	if (!tok->report_warnings) {
156	0	return 0;
157	0	}
158
159	10.5k	PyObject *errmsg;
160	10.5k	va_list vargs;
161	10.5k	va_start(vargs, format);
162	10.5k	errmsg = PyUnicode_FromFormatV(format, vargs);
163	10.5k	va_end(vargs);
164	10.5k	if (!errmsg) {
165	0	goto error;
166	0	}
167
168	10.5k	if (PyErr_WarnExplicitObject(category, errmsg, tok->filename,
169	10.5k	tok->lineno, NULL, NULL) < 0) {
170	0	if (PyErr_ExceptionMatches(category)) {
171		/* Replace the DeprecationWarning exception with a SyntaxError
172		to get a more accurate error report */
173	0	PyErr_Clear();
174	0	_PyTokenizer_syntaxerror(tok, "%U", errmsg);
175	0	}
176	0	goto error;
177	0	}
178	10.5k	Py_DECREF(errmsg);
179	10.5k	return 0;
180
181	0	error:
182	0	Py_XDECREF(errmsg);
183	0	tok->done = E_ERROR;
184	0	return -1;
185	10.5k	}
186
187
188		/* ############## STRING MANIPULATION ############## */
189
190		char *
191		_PyTokenizer_new_string(const char s, Py_ssize_t len, struct tok_state tok)
192	4.73k	{
193	4.73k	char* result = (char *)PyMem_Malloc(len + 1);
194	4.73k	if (!result) {
195	0	tok->done = E_NOMEM;
196	0	return NULL;
197	0	}
198	4.73k	memcpy(result, s, len);
199	4.73k	result[len] = '\0';
200	4.73k	return result;
201	4.73k	}
202
203		PyObject *
204	4.63k	_PyTokenizer_translate_into_utf8(const char* str, const char* enc) {
205	4.63k	PyObject *utf8;
206	4.63k	PyObject* buf = PyUnicode_Decode(str, strlen(str), enc, NULL);
207	4.63k	if (buf == NULL)
208	1.98k	return NULL;
209	2.64k	utf8 = PyUnicode_AsUTF8String(buf);
210	2.64k	Py_DECREF(buf);
211	2.64k	return utf8;
212	4.63k	}
213
214		char *
215		_PyTokenizer_translate_newlines(const char *s, int exec_input, int preserve_crlf,
216	21.6k	struct tok_state *tok) {
217	21.6k	int skip_next_lf = 0;
218	21.6k	size_t needed_length = strlen(s) + 2, final_length;
219	21.6k	char buf, current;
220	21.6k	char c = '\0';
221	21.6k	buf = PyMem_Malloc(needed_length);
222	21.6k	if (buf == NULL) {
223	0	tok->done = E_NOMEM;
224	0	return NULL;
225	0	}
226	7.17M	for (current = buf; *s; s++, current++) {
227	7.15M	c = *s;
228	7.15M	if (skip_next_lf) {
229	8.79k	skip_next_lf = 0;
230	8.79k	if (c == '\n') {
231	258	c = *++s;
232	258	if (!c)
233	3	break;
234	258	}
235	8.79k	}
236	7.15M	if (!preserve_crlf && c == '\r') {
237	8.83k	skip_next_lf = 1;
238	8.83k	c = '\n';
239	8.83k	}
240	7.15M	*current = c;
241	7.15M	}
242		/* If this is exec input, add a newline to the end of the string if
243		there isn't one already. */
244	21.6k	if (exec_input && c != '\n' && c != '\0') {
245	21.0k	*current = '\n';
246	21.0k	current++;
247	21.0k	}
248	21.6k	*current = '\0';
249	21.6k	final_length = current - buf + 1;
250	21.6k	if (final_length < needed_length && final_length) {
251		/* should never fail */
252	656	char* result = PyMem_Realloc(buf, final_length);
253	656	if (result == NULL) {
254	0	PyMem_Free(buf);
255	0	}
256	656	buf = result;
257	656	}
258	21.6k	return buf;
259	21.6k	}
260
261		/* ############## ENCODING STUFF ############## */
262
263
264		/* See whether the file starts with a BOM. If it does,
265		invoke the set_readline function with the new encoding.
266		Return 1 on success, 0 on failure. */
267		int
268		_PyTokenizer_check_bom(int get_char(struct tok_state *),
269		void unget_char(int, struct tok_state *),
270		int set_readline(struct tok_state , const char ),
271		struct tok_state *tok)
272	21.5k	{
273	21.5k	int ch1, ch2, ch3;
274	21.5k	ch1 = get_char(tok);
275	21.5k	tok->decoding_state = STATE_SEEK_CODING;
276	21.5k	if (ch1 == EOF) {
277	0	return 1;
278	21.5k	} else if (ch1 == 0xEF) {
279	64	ch2 = get_char(tok);
280	64	if (ch2 != 0xBB) {
281	56	unget_char(ch2, tok);
282	56	unget_char(ch1, tok);
283	56	return 1;
284	56	}
285	8	ch3 = get_char(tok);
286	8	if (ch3 != 0xBF) {
287	3	unget_char(ch3, tok);
288	3	unget_char(ch2, tok);
289	3	unget_char(ch1, tok);
290	3	return 1;
291	3	}
292	21.4k	} else {
293	21.4k	unget_char(ch1, tok);
294	21.4k	return 1;
295	21.4k	}
296	5	if (tok->encoding != NULL)
297	0	PyMem_Free(tok->encoding);
298	5	tok->encoding = _PyTokenizer_new_string("utf-8", 5, tok);
299	5	if (!tok->encoding)
300	0	return 0;
301		/* No need to set_readline: input is already utf-8 */
302	5	return 1;
303	5	}
304
305		static const char *
306		get_normal_name(const char s) / for utf-8 and latin-1 */
307	4.63k	{
308	4.63k	char buf[13];
309	4.63k	int i;
310	30.5k	for (i = 0; i < 12; i++) {
311	30.3k	int c = s[i];
312	30.3k	if (c == '\0')
313	4.38k	break;
314	25.9k	else if (c == '_')
315	726	buf[i] = '-';
316	25.2k	else
317	25.2k	buf[i] = Py_TOLOWER(c);
318	30.3k	}
319	4.63k	buf[i] = '\0';
320	4.63k	if (strcmp(buf, "utf-8") == 0 \|\|
321	4.63k	strncmp(buf, "utf-8-", 6) == 0)
322	2	return "utf-8";
323	4.63k	else if (strcmp(buf, "latin-1") == 0 \|\|
324	4.63k	strcmp(buf, "iso-8859-1") == 0 \|\|
325	4.63k	strcmp(buf, "iso-latin-1") == 0 \|\|
326	4.63k	strncmp(buf, "latin-1-", 8) == 0 \|\|
327	4.62k	strncmp(buf, "iso-8859-1-", 11) == 0 \|\|
328	4.62k	strncmp(buf, "iso-latin-1-", 12) == 0)
329	13	return "iso-8859-1";
330	4.62k	else
331	4.62k	return s;
332	4.63k	}
333
334		/* Return the coding spec in S, or NULL if none is found. */
335		static int
336		get_coding_spec(const char s, char spec, Py_ssize_t size, struct tok_state tok)
337	22.1k	{
338	22.1k	Py_ssize_t i;
339	22.1k	*spec = NULL;
340		/* Coding spec must be in a comment, and that comment must be
341		* the only statement on the source code line. */
342	23.4k	for (i = 0; i < size - 6; i++) {
343	18.8k	if (s[i] == '#')
344	4.87k	break;
345	13.9k	if (s[i] != ' ' && s[i] != '\t' && s[i] != '\014')
346	12.6k	return 1;
347	13.9k	}
348	200k	for (; i < size - 6; i++) { /* XXX inefficient search */
349	195k	const char* t = s + i;
350	195k	if (memcmp(t, "coding", 6) == 0) {
351	5.26k	const char* begin = NULL;
352	5.26k	t += 6;
353	5.26k	if (t[0] != ':' && t[0] != '=')
354	209	continue;
355	5.76k	do {
356	5.76k	t++;
357	5.76k	} while (t[0] == ' ' \|\| t[0] == '\t');
358
359	5.05k	begin = t;
360	38.7k	while (Py_ISALNUM(t[0]) \|\|
361	7.63k	t[0] == '-' \|\| t[0] == '_' \|\| t[0] == '.')
362	33.6k	t++;
363
364	5.05k	if (begin < t) {
365	4.63k	char* r = _PyTokenizer_new_string(begin, t - begin, tok);
366	4.63k	const char* q;
367	4.63k	if (!r)
368	0	return 0;
369	4.63k	q = get_normal_name(r);
370	4.63k	if (r != q) {
371	15	PyMem_Free(r);
372	15	r = _PyTokenizer_new_string(q, strlen(q), tok);
373	15	if (!r)
374	0	return 0;
375	15	}
376	4.63k	*spec = r;
377	4.63k	break;
378	4.63k	}
379	5.05k	}
380	195k	}
381	9.51k	return 1;
382	9.51k	}
383
384		/* Check whether the line contains a coding spec. If it does,
385		invoke the set_readline function for the new encoding.
386		This function receives the tok_state and the new encoding.
387		Return 1 on success, 0 on failure. */
388		int
389		_PyTokenizer_check_coding_spec(const char* line, Py_ssize_t size, struct tok_state *tok,
390		int set_readline(struct tok_state , const char ))
391	22.1k	{
392	22.1k	char *cs;
393	22.1k	if (tok->cont_line) {
394		/* It's a continuation line, so it can't be a coding spec. */
395	0	tok->decoding_state = STATE_NORMAL;
396	0	return 1;
397	0	}
398	22.1k	if (!get_coding_spec(line, &cs, size, tok)) {
399	0	return 0;
400	0	}
401	22.1k	if (!cs) {
402	17.5k	Py_ssize_t i;
403	19.0k	for (i = 0; i < size; i++) {
404	18.6k	if (line[i] == '#' \|\| line[i] == '\n' \|\| line[i] == '\r')
405	508	break;
406	18.1k	if (line[i] != ' ' && line[i] != '\t' && line[i] != '\014') {
407		/* Stop checking coding spec after a line containing
408		* anything except a comment. */
409	16.6k	tok->decoding_state = STATE_NORMAL;
410	16.6k	break;
411	16.6k	}
412	18.1k	}
413	17.5k	return 1;
414	17.5k	}
415	4.63k	tok->decoding_state = STATE_NORMAL;
416	4.63k	if (tok->encoding == NULL) {
417	4.63k	assert(tok->decoding_readline == NULL);
418	4.63k	if (strcmp(cs, "utf-8") != 0 && !set_readline(tok, cs)) {
419	0	_PyTokenizer_error_ret(tok);
420	0	PyErr_Format(PyExc_SyntaxError, "encoding problem: %s", cs);
421	0	PyMem_Free(cs);
422	0	return 0;
423	0	}
424	4.63k	tok->encoding = cs;
425	4.63k	} else { /* then, compare cs with BOM */
426	3	if (strcmp(tok->encoding, cs) != 0) {
427	3	tok->line_start = line;
428	3	tok->cur = (char *)line;
429	3	assert(size <= INT_MAX);
430	3	_PyTokenizer_syntaxerror_known_range(tok, 0, (int)size,
431	3	"encoding problem: %s with BOM", cs);
432	3	PyMem_Free(cs);
433	3	_PyTokenizer_error_ret(tok);
434	3	return 0;
435	3	}
436	0	PyMem_Free(cs);
437	0	}
438	4.63k	return 1;
439	4.63k	}
440
441		/* Check whether the characters at s start a valid
442		UTF-8 sequence. Return the number of characters forming
443		the sequence if yes, 0 if not. The special cases match
444		those in stringlib/codecs.h:utf8_decode.
445		*/
446		static int
447		valid_utf8(const unsigned char* s)
448	6.44M	{
449	6.44M	int expected = 0;
450	6.44M	int length;
451	6.44M	if (*s < 0x80) {
452		/* single-byte code */
453	6.43M	return 1;
454	6.43M	}
455	7.13k	else if (*s < 0xE0) {
456		/* \xC2\x80-\xDF\xBF -- 0080-07FF */
457	3.20k	if (*s < 0xC2) {
458		/* invalid sequence
459		\x80-\xBF -- continuation byte
460		\xC0-\xC1 -- fake 0000-007F */
461	135	return 0;
462	135	}
463	3.07k	expected = 1;
464	3.07k	}
465	3.92k	else if (*s < 0xF0) {
466		/* \xE0\xA0\x80-\xEF\xBF\xBF -- 0800-FFFF */
467	1.55k	if (s == 0xE0 && (s + 1) < 0xA0) {
468		/* invalid sequence
469		\xE0\x80\x80-\xE0\x9F\xBF -- fake 0000-0800 */
470	25	return 0;
471	25	}
472	1.52k	else if (s == 0xED && (s + 1) >= 0xA0) {
473		/* Decoding UTF-8 sequences in range \xED\xA0\x80-\xED\xBF\xBF
474		will result in surrogates in range D800-DFFF. Surrogates are
475		not valid UTF-8 so they are rejected.
476		See https://www.unicode.org/versions/Unicode5.2.0/ch03.pdf
477		(table 3-7) and http://www.rfc-editor.org/rfc/rfc3629.txt */
478	23	return 0;
479	23	}
480	1.50k	expected = 2;
481	1.50k	}
482	2.37k	else if (*s < 0xF5) {
483		/* \xF0\x90\x80\x80-\xF4\x8F\xBF\xBF -- 10000-10FFFF */
484	2.32k	if ((s + 1) < 0x90 ? s == 0xF0 : *s == 0xF4) {
485		/* invalid sequence -- one of:
486		\xF0\x80\x80\x80-\xF0\x8F\xBF\xBF -- fake 0000-FFFF
487		\xF4\x90\x80\x80- -- 110000- overflow */
488	54	return 0;
489	54	}
490	2.26k	expected = 3;
491	2.26k	}
492	51	else {
493		/* invalid start byte */
494	51	return 0;
495	51	}
496	6.84k	length = expected + 1;
497	19.0k	for (; expected; expected--)
498	12.5k	if (s[expected] < 0x80 \|\| s[expected] >= 0xC0)
499	317	return 0;
500	6.52k	return length;
501	6.84k	}
502
503		int
504		_PyTokenizer_ensure_utf8(const char line, struct tok_state tok, int lineno)
505	16.9k	{
506	16.9k	const char *badchar = NULL;
507	16.9k	const char *c;
508	16.9k	int length;
509	16.9k	int col_offset = 0;
510	16.9k	const char *line_start = line;
511	6.46M	for (c = line; *c; c += length) {
512	6.44M	if (!(length = valid_utf8((const unsigned char *)c))) {
513	605	badchar = c;
514	605	break;
515	605	}
516	6.44M	col_offset++;
517	6.44M	if (*c == '\n') {
518	217k	lineno++;
519	217k	col_offset = 0;
520	217k	line_start = c + 1;
521	217k	}
522	6.44M	}
523	16.9k	if (badchar) {
524	605	tok->lineno = lineno;
525	605	tok->line_start = line_start;
526	605	tok->cur = (char *)badchar;
527	605	_PyTokenizer_syntaxerror_known_range(tok,
528	605	col_offset + 1, col_offset + 1,
529	605	"Non-UTF-8 code starting with '\\x%.2x'"
530	605	"%s%V on line %i, "
531	605	"but no encoding declared; "
532	605	"see https://peps.python.org/pep-0263/ for details",
533	605	(unsigned char)*badchar,
534	605	tok->filename ? " in file " : "", tok->filename, "",
535	605	lineno);
536	605	return 0;
537	605	}
538	16.3k	return 1;
539	16.9k	}
540
541
542		/* ############## DEBUGGING STUFF ############## */
543
544		#ifdef Py_DEBUG
545		void
546		_PyTokenizer_print_escape(FILE f, const char s, Py_ssize_t size)
547		{
548		if (s == NULL) {
549		fputs("NULL", f);
550		return;
551		}
552		putc('"', f);
553		while (size-- > 0) {
554		unsigned char c = *s++;
555		switch (c) {
556		case '\n': fputs("\\n", f); break;
557		case '\r': fputs("\\r", f); break;
558		case '\t': fputs("\\t", f); break;
559		case '\f': fputs("\\f", f); break;
560		case '\'': fputs("\\'", f); break;
561		case '"': fputs("\\\"", f); break;
562		default:
563		if (0x20 <= c && c <= 0x7f)
564		putc(c, f);
565		else
566		fprintf(f, "\\x%02x", c);
567		}
568		}
569		putc('"', f);
570		}
571
572		void
573		_PyTokenizer_tok_dump(int type, char start, char end)
574		{
575		fprintf(stderr, "%s", _PyParser_TokenNames[type]);
576		if (type == NAME \|\| type == NUMBER \|\| type == STRING \|\| type == OP)
577		fprintf(stderr, "(%.*s)", (int)(end - start), start);
578		}
579		#endif