mirror of
https://github.com/python/cpython.git
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1978 lines
59 KiB
C
1978 lines
59 KiB
C
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/* Tokenizer implementation */
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#define PY_SSIZE_T_CLEAN
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#include "Python.h"
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#include <ctype.h>
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#include <assert.h>
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#include "tokenizer.h"
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#include "errcode.h"
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#include "unicodeobject.h"
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#include "bytesobject.h"
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#include "fileobject.h"
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#include "codecs.h"
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#include "abstract.h"
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/* Alternate tab spacing */
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#define ALTTABSIZE 1
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#define is_potential_identifier_start(c) (\
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(c >= 'a' && c <= 'z')\
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|| (c >= 'A' && c <= 'Z')\
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|| c == '_'\
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|| (c >= 128))
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#define is_potential_identifier_char(c) (\
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(c >= 'a' && c <= 'z')\
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|| (c >= 'A' && c <= 'Z')\
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|| (c >= '0' && c <= '9')\
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|| c == '_'\
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|| (c >= 128))
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/* Don't ever change this -- it would break the portability of Python code */
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#define TABSIZE 8
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/* Forward */
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static struct tok_state *tok_new(void);
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static int tok_nextc(struct tok_state *tok);
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static void tok_backup(struct tok_state *tok, int c);
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/* Spaces in this constant are treated as "zero or more spaces or tabs" when
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tokenizing. */
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static const char* type_comment_prefix = "# type: ";
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/* Create and initialize a new tok_state structure */
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static struct tok_state *
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tok_new(void)
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{
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struct tok_state *tok = (struct tok_state *)PyMem_Malloc(
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sizeof(struct tok_state));
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if (tok == NULL)
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return NULL;
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tok->buf = tok->cur = tok->inp = NULL;
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tok->fp_interactive = 0;
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tok->interactive_src_start = NULL;
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tok->interactive_src_end = NULL;
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tok->start = NULL;
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tok->end = NULL;
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tok->done = E_OK;
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tok->fp = NULL;
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tok->input = NULL;
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tok->tabsize = TABSIZE;
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tok->indent = 0;
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tok->indstack[0] = 0;
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tok->atbol = 1;
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tok->pendin = 0;
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tok->prompt = tok->nextprompt = NULL;
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tok->lineno = 0;
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tok->level = 0;
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tok->altindstack[0] = 0;
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tok->decoding_state = STATE_INIT;
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tok->decoding_erred = 0;
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tok->read_coding_spec = 0;
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tok->enc = NULL;
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tok->encoding = NULL;
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tok->cont_line = 0;
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tok->filename = NULL;
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tok->decoding_readline = NULL;
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tok->decoding_buffer = NULL;
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tok->type_comments = 0;
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tok->async_hacks = 0;
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tok->async_def = 0;
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tok->async_def_indent = 0;
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tok->async_def_nl = 0;
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return tok;
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}
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static char *
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new_string(const char *s, Py_ssize_t len, struct tok_state *tok)
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{
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char* result = (char *)PyMem_Malloc(len + 1);
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if (!result) {
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tok->done = E_NOMEM;
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return NULL;
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}
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memcpy(result, s, len);
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result[len] = '\0';
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return result;
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}
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static char *
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error_ret(struct tok_state *tok) /* XXX */
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{
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tok->decoding_erred = 1;
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if (tok->fp != NULL && tok->buf != NULL) /* see PyTokenizer_Free */
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PyMem_Free(tok->buf);
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tok->buf = tok->cur = tok->inp = NULL;
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tok->start = NULL;
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tok->end = NULL;
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tok->done = E_DECODE;
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return NULL; /* as if it were EOF */
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}
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static const char *
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get_normal_name(const char *s) /* for utf-8 and latin-1 */
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{
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char buf[13];
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int i;
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for (i = 0; i < 12; i++) {
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int c = s[i];
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if (c == '\0')
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break;
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else if (c == '_')
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buf[i] = '-';
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else
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buf[i] = tolower(c);
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}
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buf[i] = '\0';
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if (strcmp(buf, "utf-8") == 0 ||
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strncmp(buf, "utf-8-", 6) == 0)
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return "utf-8";
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else if (strcmp(buf, "latin-1") == 0 ||
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strcmp(buf, "iso-8859-1") == 0 ||
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strcmp(buf, "iso-latin-1") == 0 ||
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strncmp(buf, "latin-1-", 8) == 0 ||
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strncmp(buf, "iso-8859-1-", 11) == 0 ||
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strncmp(buf, "iso-latin-1-", 12) == 0)
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return "iso-8859-1";
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else
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return s;
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}
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/* Return the coding spec in S, or NULL if none is found. */
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static int
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get_coding_spec(const char *s, char **spec, Py_ssize_t size, struct tok_state *tok)
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{
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Py_ssize_t i;
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*spec = NULL;
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/* Coding spec must be in a comment, and that comment must be
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* the only statement on the source code line. */
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for (i = 0; i < size - 6; i++) {
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if (s[i] == '#')
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break;
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if (s[i] != ' ' && s[i] != '\t' && s[i] != '\014')
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return 1;
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}
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for (; i < size - 6; i++) { /* XXX inefficient search */
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const char* t = s + i;
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if (strncmp(t, "coding", 6) == 0) {
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const char* begin = NULL;
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t += 6;
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if (t[0] != ':' && t[0] != '=')
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continue;
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do {
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t++;
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} while (t[0] == '\x20' || t[0] == '\t');
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begin = t;
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while (Py_ISALNUM(t[0]) ||
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t[0] == '-' || t[0] == '_' || t[0] == '.')
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t++;
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if (begin < t) {
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char* r = new_string(begin, t - begin, tok);
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const char* q;
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if (!r)
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return 0;
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q = get_normal_name(r);
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if (r != q) {
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PyMem_Free(r);
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r = new_string(q, strlen(q), tok);
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if (!r)
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return 0;
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}
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*spec = r;
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break;
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}
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}
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}
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return 1;
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}
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/* Check whether the line contains a coding spec. If it does,
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invoke the set_readline function for the new encoding.
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This function receives the tok_state and the new encoding.
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Return 1 on success, 0 on failure. */
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static int
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check_coding_spec(const char* line, Py_ssize_t size, struct tok_state *tok,
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int set_readline(struct tok_state *, const char *))
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{
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char *cs;
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int r = 1;
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if (tok->cont_line) {
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/* It's a continuation line, so it can't be a coding spec. */
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tok->read_coding_spec = 1;
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return 1;
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}
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if (!get_coding_spec(line, &cs, size, tok))
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return 0;
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if (!cs) {
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Py_ssize_t i;
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for (i = 0; i < size; i++) {
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if (line[i] == '#' || line[i] == '\n' || line[i] == '\r')
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break;
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if (line[i] != ' ' && line[i] != '\t' && line[i] != '\014') {
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/* Stop checking coding spec after a line containing
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* anything except a comment. */
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tok->read_coding_spec = 1;
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break;
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}
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}
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return 1;
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}
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tok->read_coding_spec = 1;
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if (tok->encoding == NULL) {
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assert(tok->decoding_state == STATE_RAW);
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if (strcmp(cs, "utf-8") == 0) {
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tok->encoding = cs;
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} else {
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r = set_readline(tok, cs);
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if (r) {
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tok->encoding = cs;
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tok->decoding_state = STATE_NORMAL;
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}
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else {
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PyErr_Format(PyExc_SyntaxError,
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"encoding problem: %s", cs);
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PyMem_Free(cs);
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}
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}
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} else { /* then, compare cs with BOM */
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r = (strcmp(tok->encoding, cs) == 0);
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if (!r)
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PyErr_Format(PyExc_SyntaxError,
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"encoding problem: %s with BOM", cs);
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PyMem_Free(cs);
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}
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return r;
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}
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/* See whether the file starts with a BOM. If it does,
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invoke the set_readline function with the new encoding.
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Return 1 on success, 0 on failure. */
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static int
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check_bom(int get_char(struct tok_state *),
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void unget_char(int, struct tok_state *),
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int set_readline(struct tok_state *, const char *),
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struct tok_state *tok)
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{
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int ch1, ch2, ch3;
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ch1 = get_char(tok);
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tok->decoding_state = STATE_RAW;
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if (ch1 == EOF) {
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return 1;
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} else if (ch1 == 0xEF) {
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ch2 = get_char(tok);
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if (ch2 != 0xBB) {
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unget_char(ch2, tok);
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unget_char(ch1, tok);
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return 1;
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}
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ch3 = get_char(tok);
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if (ch3 != 0xBF) {
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unget_char(ch3, tok);
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unget_char(ch2, tok);
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unget_char(ch1, tok);
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return 1;
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}
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#if 0
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/* Disable support for UTF-16 BOMs until a decision
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is made whether this needs to be supported. */
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} else if (ch1 == 0xFE) {
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ch2 = get_char(tok);
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if (ch2 != 0xFF) {
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unget_char(ch2, tok);
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unget_char(ch1, tok);
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return 1;
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}
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if (!set_readline(tok, "utf-16-be"))
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return 0;
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tok->decoding_state = STATE_NORMAL;
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} else if (ch1 == 0xFF) {
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ch2 = get_char(tok);
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if (ch2 != 0xFE) {
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unget_char(ch2, tok);
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unget_char(ch1, tok);
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return 1;
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}
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if (!set_readline(tok, "utf-16-le"))
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return 0;
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tok->decoding_state = STATE_NORMAL;
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#endif
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} else {
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unget_char(ch1, tok);
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return 1;
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}
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if (tok->encoding != NULL)
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PyMem_Free(tok->encoding);
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tok->encoding = new_string("utf-8", 5, tok);
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if (!tok->encoding)
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return 0;
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/* No need to set_readline: input is already utf-8 */
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return 1;
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}
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static int tok_concatenate_interactive_new_line(struct tok_state* tok, char* line) {
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assert(tok->fp_interactive);
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if (!line) {
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return 0;
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}
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Py_ssize_t current_size = tok->interactive_src_end - tok->interactive_src_start;
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Py_ssize_t line_size = strlen(line);
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char* new_str = tok->interactive_src_start;
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new_str = PyMem_Realloc(new_str, current_size + line_size + 1);
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if (!new_str) {
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if (tok->interactive_src_start) {
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PyMem_Free(tok->interactive_src_start);
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}
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tok->interactive_src_start = NULL;
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tok->interactive_src_end = NULL;
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tok->done = E_NOMEM;
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return -1;
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}
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strcpy(new_str + current_size, line);
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tok->interactive_src_start = new_str;
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tok->interactive_src_end = new_str + current_size + line_size;
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return 0;
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}
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/* Read a line of text from TOK into S, using the stream in TOK.
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Return NULL on failure, else S.
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On entry, tok->decoding_buffer will be one of:
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1) NULL: need to call tok->decoding_readline to get a new line
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2) PyUnicodeObject *: decoding_feof has called tok->decoding_readline and
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stored the result in tok->decoding_buffer
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3) PyByteArrayObject *: previous call to fp_readl did not have enough room
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(in the s buffer) to copy entire contents of the line read
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by tok->decoding_readline. tok->decoding_buffer has the overflow.
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In this case, fp_readl is called in a loop (with an expanded buffer)
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until the buffer ends with a '\n' (or until the end of the file is
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reached): see tok_nextc and its calls to decoding_fgets.
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*/
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static char *
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fp_readl(char *s, int size, struct tok_state *tok)
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{
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PyObject* bufobj;
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const char *buf;
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Py_ssize_t buflen;
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/* Ask for one less byte so we can terminate it */
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assert(size > 0);
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size--;
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if (tok->decoding_buffer) {
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bufobj = tok->decoding_buffer;
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Py_INCREF(bufobj);
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}
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else
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{
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bufobj = _PyObject_CallNoArg(tok->decoding_readline);
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if (bufobj == NULL)
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goto error;
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}
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if (PyUnicode_CheckExact(bufobj))
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{
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buf = PyUnicode_AsUTF8AndSize(bufobj, &buflen);
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if (buf == NULL) {
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goto error;
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}
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}
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else
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{
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buf = PyByteArray_AsString(bufobj);
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if (buf == NULL) {
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goto error;
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}
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buflen = PyByteArray_GET_SIZE(bufobj);
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}
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Py_XDECREF(tok->decoding_buffer);
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if (buflen > size) {
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/* Too many chars, the rest goes into tok->decoding_buffer */
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tok->decoding_buffer = PyByteArray_FromStringAndSize(buf+size,
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buflen-size);
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if (tok->decoding_buffer == NULL)
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goto error;
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buflen = size;
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}
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else
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tok->decoding_buffer = NULL;
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memcpy(s, buf, buflen);
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s[buflen] = '\0';
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if (buflen == 0) /* EOF */
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s = NULL;
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Py_DECREF(bufobj);
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return s;
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error:
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Py_XDECREF(bufobj);
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return error_ret(tok);
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}
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/* Set the readline function for TOK to a StreamReader's
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readline function. The StreamReader is named ENC.
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This function is called from check_bom and check_coding_spec.
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ENC is usually identical to the future value of tok->encoding,
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except for the (currently unsupported) case of UTF-16.
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Return 1 on success, 0 on failure. */
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static int
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fp_setreadl(struct tok_state *tok, const char* enc)
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{
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PyObject *readline, *io, *stream;
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_Py_IDENTIFIER(open);
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_Py_IDENTIFIER(readline);
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int fd;
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long pos;
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fd = fileno(tok->fp);
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/* Due to buffering the file offset for fd can be different from the file
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* position of tok->fp. If tok->fp was opened in text mode on Windows,
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* its file position counts CRLF as one char and can't be directly mapped
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* to the file offset for fd. Instead we step back one byte and read to
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* the end of line.*/
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pos = ftell(tok->fp);
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if (pos == -1 ||
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lseek(fd, (off_t)(pos > 0 ? pos - 1 : pos), SEEK_SET) == (off_t)-1) {
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PyErr_SetFromErrnoWithFilename(PyExc_OSError, NULL);
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return 0;
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}
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io = PyImport_ImportModuleNoBlock("io");
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if (io == NULL)
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return 0;
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stream = _PyObject_CallMethodId(io, &PyId_open, "isisOOO",
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fd, "r", -1, enc, Py_None, Py_None, Py_False);
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Py_DECREF(io);
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if (stream == NULL)
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return 0;
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readline = _PyObject_GetAttrId(stream, &PyId_readline);
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Py_DECREF(stream);
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if (readline == NULL)
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return 0;
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Py_XSETREF(tok->decoding_readline, readline);
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if (pos > 0) {
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PyObject *bufobj = _PyObject_CallNoArg(readline);
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if (bufobj == NULL)
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return 0;
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Py_DECREF(bufobj);
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}
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return 1;
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}
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/* Fetch the next byte from TOK. */
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static int fp_getc(struct tok_state *tok) {
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return getc(tok->fp);
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}
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/* Unfetch the last byte back into TOK. */
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static void fp_ungetc(int c, struct tok_state *tok) {
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ungetc(c, tok->fp);
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}
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/* Check whether the characters at s start a valid
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UTF-8 sequence. Return the number of characters forming
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the sequence if yes, 0 if not. */
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static int valid_utf8(const unsigned char* s)
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{
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int expected = 0;
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int length;
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if (*s < 0x80)
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/* single-byte code */
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return 1;
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if (*s < 0xc0)
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/* following byte */
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return 0;
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if (*s < 0xE0)
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expected = 1;
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else if (*s < 0xF0)
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expected = 2;
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else if (*s < 0xF8)
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expected = 3;
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else
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return 0;
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length = expected + 1;
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for (; expected; expected--)
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if (s[expected] < 0x80 || s[expected] >= 0xC0)
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return 0;
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return length;
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}
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|
|
/* Read a line of input from TOK. Determine encoding
|
|
if necessary. */
|
|
|
|
static char *
|
|
decoding_fgets(char *s, int size, 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);
|
|
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. */
|
|
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;
|
|
}
|
|
}
|
|
|
|
/* 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, 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 (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') {
|
|
*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)
|
|
{
|
|
PyObject* utf8 = NULL;
|
|
char *str;
|
|
const char *s;
|
|
const char *newl[2] = {NULL, NULL};
|
|
int lineno = 0;
|
|
tok->input = str = translate_newlines(input, single, 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 error_ret(tok);
|
|
if (tok->enc == NULL && !tok->read_coding_spec && newl[1]) {
|
|
if (!check_coding_spec(newl[0]+1, newl[1] - newl[0],
|
|
tok, buf_setreadl))
|
|
return error_ret(tok);
|
|
}
|
|
}
|
|
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)
|
|
{
|
|
struct tok_state *tok = tok_new();
|
|
char *decoded;
|
|
|
|
if (tok == NULL)
|
|
return NULL;
|
|
decoded = decode_str(str, exec_input, tok);
|
|
if (decoded == NULL) {
|
|
PyTokenizer_Free(tok);
|
|
return NULL;
|
|
}
|
|
|
|
tok->buf = tok->cur = tok->inp = decoded;
|
|
tok->end = decoded;
|
|
return tok;
|
|
}
|
|
|
|
struct tok_state *
|
|
PyTokenizer_FromUTF8(const char *str, int exec_input)
|
|
{
|
|
struct tok_state *tok = tok_new();
|
|
char *translated;
|
|
if (tok == NULL)
|
|
return NULL;
|
|
tok->input = translated = translate_newlines(str, exec_input, tok);
|
|
if (translated == NULL) {
|
|
PyTokenizer_Free(tok);
|
|
return NULL;
|
|
}
|
|
tok->decoding_state = STATE_RAW;
|
|
tok->read_coding_spec = 1;
|
|
tok->enc = NULL;
|
|
tok->str = translated;
|
|
tok->encoding = (char *)PyMem_Malloc(6);
|
|
if (!tok->encoding) {
|
|
PyTokenizer_Free(tok);
|
|
return NULL;
|
|
}
|
|
strcpy(tok->encoding, "utf-8");
|
|
|
|
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 = PyMem_Malloc(strlen(enc)+1);
|
|
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
|
|
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->filename);
|
|
if (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);
|
|
}
|
|
PyMem_Free(tok);
|
|
}
|
|
|
|
/* Get next char, updating state; error code goes into tok->done */
|
|
|
|
static int
|
|
tok_nextc(struct tok_state *tok)
|
|
{
|
|
for (;;) {
|
|
if (tok->cur != tok->inp) {
|
|
return Py_CHARMASK(*tok->cur++); /* Fast path */
|
|
}
|
|
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++);
|
|
}
|
|
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 {
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
if (tok->done != E_OK) {
|
|
if (tok->prompt != NULL)
|
|
PySys_WriteStderr("\n");
|
|
tok->cur = tok->inp;
|
|
return EOF;
|
|
}
|
|
}
|
|
/*NOTREACHED*/
|
|
}
|
|
|
|
|
|
/* 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 (*tok->cur != c) {
|
|
*tok->cur = c;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
static int
|
|
syntaxerror(struct tok_state *tok, const char *format, ...)
|
|
{
|
|
PyObject *errmsg, *errtext, *args;
|
|
va_list vargs;
|
|
#ifdef HAVE_STDARG_PROTOTYPES
|
|
va_start(vargs, format);
|
|
#else
|
|
va_start(vargs);
|
|
#endif
|
|
errmsg = PyUnicode_FromFormatV(format, vargs);
|
|
va_end(vargs);
|
|
if (!errmsg) {
|
|
goto error;
|
|
}
|
|
|
|
errtext = PyUnicode_DecodeUTF8(tok->line_start, tok->cur - tok->line_start,
|
|
"replace");
|
|
if (!errtext) {
|
|
goto error;
|
|
}
|
|
int offset = (int)PyUnicode_GET_LENGTH(errtext);
|
|
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(OiiN))", errmsg,
|
|
tok->filename, tok->lineno, offset, errtext);
|
|
if (args) {
|
|
PyErr_SetObject(PyExc_SyntaxError, args);
|
|
Py_DECREF(args);
|
|
}
|
|
|
|
error:
|
|
Py_XDECREF(errmsg);
|
|
tok->done = E_ERROR;
|
|
return ERRORTOKEN;
|
|
}
|
|
|
|
static int
|
|
indenterror(struct tok_state *tok)
|
|
{
|
|
tok->done = E_TABSPACE;
|
|
tok->cur = tok->inp;
|
|
return ERRORTOKEN;
|
|
}
|
|
|
|
/* 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)
|
|
{
|
|
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);
|
|
// PyUnicode_FromFormatV() does not support %X
|
|
char hex[9];
|
|
(void)PyOS_snprintf(hex, sizeof(hex), "%04X", ch);
|
|
if (Py_UNICODE_ISPRINTABLE(ch)) {
|
|
syntaxerror(tok, "invalid character '%c' (U+%s)", ch, hex);
|
|
}
|
|
else {
|
|
syntaxerror(tok, "invalid non-printable character U+%s", hex);
|
|
}
|
|
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 (isdigit(c));
|
|
if (c != '_') {
|
|
break;
|
|
}
|
|
c = tok_nextc(tok);
|
|
if (!isdigit(c)) {
|
|
tok_backup(tok, c);
|
|
syntaxerror(tok, "invalid decimal literal");
|
|
return 0;
|
|
}
|
|
}
|
|
return c;
|
|
}
|
|
|
|
/* Get next token, after space stripping etc. */
|
|
|
|
static int
|
|
tok_get(struct tok_state *tok, const char **p_start, const char **p_end)
|
|
{
|
|
int c;
|
|
int blankline, nonascii;
|
|
|
|
*p_start = *p_end = NULL;
|
|
nextline:
|
|
tok->start = NULL;
|
|
blankline = 0;
|
|
|
|
/* Get indentation level */
|
|
if (tok->atbol) {
|
|
int col = 0;
|
|
int altcol = 0;
|
|
tok->atbol = 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 {
|
|
break;
|
|
}
|
|
}
|
|
tok_backup(tok, c);
|
|
if (c == '#' || c == '\n' || c == '\\') {
|
|
/* Lines with only whitespace and/or comments
|
|
and/or a line continuation character
|
|
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) {
|
|
if (col == tok->indstack[tok->indent]) {
|
|
/* No change */
|
|
if (altcol != tok->altindstack[tok->indent]) {
|
|
return 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 ERRORTOKEN;
|
|
}
|
|
if (altcol <= tok->altindstack[tok->indent]) {
|
|
return 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 ERRORTOKEN;
|
|
}
|
|
if (altcol != tok->altindstack[tok->indent]) {
|
|
return indenterror(tok);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
tok->start = tok->cur;
|
|
|
|
/* Return pending indents/dedents */
|
|
if (tok->pendin != 0) {
|
|
if (tok->pendin < 0) {
|
|
tok->pendin++;
|
|
return DEDENT;
|
|
}
|
|
else {
|
|
tok->pendin--;
|
|
return INDENT;
|
|
}
|
|
}
|
|
|
|
/* Peek ahead at the next character */
|
|
c = tok_nextc(tok);
|
|
tok_backup(tok, c);
|
|
/* Check if we are closing an async function */
|
|
if (tok->async_def
|
|
&& !blankline
|
|
/* Due to some implementation artifacts of type comments,
|
|
* a TYPE_COMMENT at the start of a function won't set an
|
|
* indentation level and it will produce a NEWLINE after it.
|
|
* To avoid spuriously ending an async function due to this,
|
|
* wait until we have some non-newline char in front of us. */
|
|
&& c != '\n'
|
|
&& tok->level == 0
|
|
/* There was a NEWLINE after ASYNC DEF,
|
|
so we're past the signature. */
|
|
&& tok->async_def_nl
|
|
/* Current indentation level is less than where
|
|
the async function was defined */
|
|
&& tok->async_def_indent >= tok->indent)
|
|
{
|
|
tok->async_def = 0;
|
|
tok->async_def_indent = 0;
|
|
tok->async_def_nl = 0;
|
|
}
|
|
|
|
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 - 1;
|
|
|
|
/* Skip comment, unless it's a type comment */
|
|
if (c == '#') {
|
|
const char *prefix, *p, *type_start;
|
|
|
|
while (c != EOF && c != '\n') {
|
|
c = tok_nextc(tok);
|
|
}
|
|
|
|
if (tok->type_comments) {
|
|
p = tok->start;
|
|
prefix = type_comment_prefix;
|
|
while (*prefix && p < tok->cur) {
|
|
if (*prefix == ' ') {
|
|
while (*p == ' ' || *p == '\t') {
|
|
p++;
|
|
}
|
|
} else if (*prefix == *p) {
|
|
p++;
|
|
} else {
|
|
break;
|
|
}
|
|
|
|
prefix++;
|
|
}
|
|
|
|
/* This is a type comment if we matched all of type_comment_prefix. */
|
|
if (!*prefix) {
|
|
int is_type_ignore = 1;
|
|
const char *ignore_end = p + 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 TYPE_IGNORE;
|
|
} else {
|
|
*p_start = type_start; /* after type_comment_prefix */
|
|
*p_end = tok->cur;
|
|
return TYPE_COMMENT;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Check for EOF and errors now */
|
|
if (c == EOF) {
|
|
if (tok->level) {
|
|
return ERRORTOKEN;
|
|
}
|
|
return 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 == '\'') {
|
|
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 ERRORTOKEN;
|
|
}
|
|
|
|
*p_start = tok->start;
|
|
*p_end = tok->cur;
|
|
|
|
/* async/await parsing block. */
|
|
if (tok->cur - tok->start == 5 && tok->start[0] == 'a') {
|
|
/* May be an 'async' or 'await' token. For Python 3.7 or
|
|
later we recognize them unconditionally. For Python
|
|
3.5 or 3.6 we recognize 'async' in front of 'def', and
|
|
either one inside of 'async def'. (Technically we
|
|
shouldn't recognize these at all for 3.4 or earlier,
|
|
but there's no *valid* Python 3.4 code that would be
|
|
rejected, and async functions will be rejected in a
|
|
later phase.) */
|
|
if (!tok->async_hacks || tok->async_def) {
|
|
/* Always recognize the keywords. */
|
|
if (memcmp(tok->start, "async", 5) == 0) {
|
|
return ASYNC;
|
|
}
|
|
if (memcmp(tok->start, "await", 5) == 0) {
|
|
return AWAIT;
|
|
}
|
|
}
|
|
else if (memcmp(tok->start, "async", 5) == 0) {
|
|
/* The current token is 'async'.
|
|
Look ahead one token to see if that is 'def'. */
|
|
|
|
struct tok_state ahead_tok;
|
|
const char *ahead_tok_start = NULL;
|
|
const char *ahead_tok_end = NULL;
|
|
int ahead_tok_kind;
|
|
|
|
memcpy(&ahead_tok, tok, sizeof(ahead_tok));
|
|
ahead_tok_kind = tok_get(&ahead_tok, &ahead_tok_start,
|
|
&ahead_tok_end);
|
|
|
|
if (ahead_tok_kind == NAME
|
|
&& ahead_tok.cur - ahead_tok.start == 3
|
|
&& memcmp(ahead_tok.start, "def", 3) == 0)
|
|
{
|
|
/* The next token is going to be 'def', so instead of
|
|
returning a plain NAME token, return ASYNC. */
|
|
tok->async_def_indent = tok->indent;
|
|
tok->async_def = 1;
|
|
return ASYNC;
|
|
}
|
|
}
|
|
}
|
|
|
|
return NAME;
|
|
}
|
|
|
|
/* Newline */
|
|
if (c == '\n') {
|
|
tok->atbol = 1;
|
|
if (blankline || tok->level > 0) {
|
|
goto nextline;
|
|
}
|
|
*p_start = tok->start;
|
|
*p_end = tok->cur - 1; /* Leave '\n' out of the string */
|
|
tok->cont_line = 0;
|
|
if (tok->async_def) {
|
|
/* We're somewhere inside an 'async def' function, and
|
|
we've encountered a NEWLINE after its signature. */
|
|
tok->async_def_nl = 1;
|
|
}
|
|
return NEWLINE;
|
|
}
|
|
|
|
/* Period or number starting with period? */
|
|
if (c == '.') {
|
|
c = tok_nextc(tok);
|
|
if (isdigit(c)) {
|
|
goto fraction;
|
|
} else if (c == '.') {
|
|
c = tok_nextc(tok);
|
|
if (c == '.') {
|
|
*p_start = tok->start;
|
|
*p_end = tok->cur;
|
|
return ELLIPSIS;
|
|
}
|
|
else {
|
|
tok_backup(tok, c);
|
|
}
|
|
tok_backup(tok, '.');
|
|
}
|
|
else {
|
|
tok_backup(tok, c);
|
|
}
|
|
*p_start = tok->start;
|
|
*p_end = tok->cur;
|
|
return DOT;
|
|
}
|
|
|
|
/* Number */
|
|
if (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 (!isxdigit(c)) {
|
|
tok_backup(tok, c);
|
|
return syntaxerror(tok, "invalid hexadecimal literal");
|
|
}
|
|
do {
|
|
c = tok_nextc(tok);
|
|
} while (isxdigit(c));
|
|
} while (c == '_');
|
|
}
|
|
else if (c == 'o' || c == 'O') {
|
|
/* Octal */
|
|
c = tok_nextc(tok);
|
|
do {
|
|
if (c == '_') {
|
|
c = tok_nextc(tok);
|
|
}
|
|
if (c < '0' || c >= '8') {
|
|
tok_backup(tok, c);
|
|
if (isdigit(c)) {
|
|
return syntaxerror(tok,
|
|
"invalid digit '%c' in octal literal", c);
|
|
}
|
|
else {
|
|
return syntaxerror(tok, "invalid octal literal");
|
|
}
|
|
}
|
|
do {
|
|
c = tok_nextc(tok);
|
|
} while ('0' <= c && c < '8');
|
|
} while (c == '_');
|
|
if (isdigit(c)) {
|
|
return syntaxerror(tok,
|
|
"invalid digit '%c' in octal literal", c);
|
|
}
|
|
}
|
|
else if (c == 'b' || c == 'B') {
|
|
/* Binary */
|
|
c = tok_nextc(tok);
|
|
do {
|
|
if (c == '_') {
|
|
c = tok_nextc(tok);
|
|
}
|
|
if (c != '0' && c != '1') {
|
|
tok_backup(tok, c);
|
|
if (isdigit(c)) {
|
|
return syntaxerror(tok,
|
|
"invalid digit '%c' in binary literal", c);
|
|
}
|
|
else {
|
|
return syntaxerror(tok, "invalid binary literal");
|
|
}
|
|
}
|
|
do {
|
|
c = tok_nextc(tok);
|
|
} while (c == '0' || c == '1');
|
|
} while (c == '_');
|
|
if (isdigit(c)) {
|
|
return syntaxerror(tok,
|
|
"invalid digit '%c' in binary literal", c);
|
|
}
|
|
}
|
|
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 (!isdigit(c)) {
|
|
tok_backup(tok, c);
|
|
return syntaxerror(tok, "invalid decimal literal");
|
|
}
|
|
}
|
|
if (c != '0') {
|
|
break;
|
|
}
|
|
c = tok_nextc(tok);
|
|
}
|
|
if (isdigit(c)) {
|
|
nonzero = 1;
|
|
c = tok_decimal_tail(tok);
|
|
if (c == 0) {
|
|
return 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) {
|
|
/* Old-style octal: now disallowed. */
|
|
tok_backup(tok, c);
|
|
return syntaxerror(tok,
|
|
"leading zeros in decimal integer "
|
|
"literals are not permitted; "
|
|
"use an 0o prefix for octal integers");
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
/* Decimal */
|
|
c = tok_decimal_tail(tok);
|
|
if (c == 0) {
|
|
return ERRORTOKEN;
|
|
}
|
|
{
|
|
/* Accept floating point numbers. */
|
|
if (c == '.') {
|
|
c = tok_nextc(tok);
|
|
fraction:
|
|
/* Fraction */
|
|
if (isdigit(c)) {
|
|
c = tok_decimal_tail(tok);
|
|
if (c == 0) {
|
|
return 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 (!isdigit(c)) {
|
|
tok_backup(tok, c);
|
|
return syntaxerror(tok, "invalid decimal literal");
|
|
}
|
|
} else if (!isdigit(c)) {
|
|
tok_backup(tok, c);
|
|
tok_backup(tok, e);
|
|
*p_start = tok->start;
|
|
*p_end = tok->cur;
|
|
return NUMBER;
|
|
}
|
|
c = tok_decimal_tail(tok);
|
|
if (c == 0) {
|
|
return ERRORTOKEN;
|
|
}
|
|
}
|
|
if (c == 'j' || c == 'J') {
|
|
/* Imaginary part */
|
|
imaginary:
|
|
c = tok_nextc(tok);
|
|
}
|
|
}
|
|
}
|
|
tok_backup(tok, c);
|
|
*p_start = tok->start;
|
|
*p_end = tok->cur;
|
|
return NUMBER;
|
|
}
|
|
|
|
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 (c == EOF || (quote_size == 1 && c == '\n')) {
|
|
// 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 (quote_size == 3) {
|
|
return syntaxerror(tok,
|
|
"unterminated triple-quoted string literal"
|
|
" (detected at line %d)", start);
|
|
}
|
|
else {
|
|
return syntaxerror(tok,
|
|
"unterminated string literal (detected at"
|
|
" line %d)", start);
|
|
}
|
|
}
|
|
if (c == quote) {
|
|
end_quote_size += 1;
|
|
}
|
|
else {
|
|
end_quote_size = 0;
|
|
if (c == '\\') {
|
|
tok_nextc(tok); /* skip escaped char */
|
|
}
|
|
}
|
|
}
|
|
|
|
*p_start = tok->start;
|
|
*p_end = tok->cur;
|
|
return STRING;
|
|
}
|
|
|
|
/* Line continuation */
|
|
if (c == '\\') {
|
|
c = tok_nextc(tok);
|
|
if (c != '\n') {
|
|
tok->done = E_LINECONT;
|
|
tok->cur = tok->inp;
|
|
return ERRORTOKEN;
|
|
}
|
|
c = tok_nextc(tok);
|
|
if (c == EOF) {
|
|
tok->done = E_EOF;
|
|
tok->cur = tok->inp;
|
|
return ERRORTOKEN;
|
|
} else {
|
|
tok_backup(tok, c);
|
|
}
|
|
tok->cont_line = 1;
|
|
goto again; /* Read next line */
|
|
}
|
|
|
|
/* Check for two-character token */
|
|
{
|
|
int c2 = tok_nextc(tok);
|
|
int token = PyToken_TwoChars(c, c2);
|
|
if (token != OP) {
|
|
int c3 = tok_nextc(tok);
|
|
int token3 = PyToken_ThreeChars(c, c2, c3);
|
|
if (token3 != OP) {
|
|
token = token3;
|
|
}
|
|
else {
|
|
tok_backup(tok, c3);
|
|
}
|
|
*p_start = tok->start;
|
|
*p_end = tok->cur;
|
|
return token;
|
|
}
|
|
tok_backup(tok, c2);
|
|
}
|
|
|
|
/* Keep track of parentheses nesting level */
|
|
switch (c) {
|
|
case '(':
|
|
case '[':
|
|
case '{':
|
|
if (tok->level >= MAXLEVEL) {
|
|
return 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++;
|
|
break;
|
|
case ')':
|
|
case ']':
|
|
case '}':
|
|
if (!tok->level) {
|
|
return syntaxerror(tok, "unmatched '%c'", c);
|
|
}
|
|
tok->level--;
|
|
int opening = tok->parenstack[tok->level];
|
|
if (!((opening == '(' && c == ')') ||
|
|
(opening == '[' && c == ']') ||
|
|
(opening == '{' && c == '}')))
|
|
{
|
|
if (tok->parenlinenostack[tok->level] != tok->lineno) {
|
|
return syntaxerror(tok,
|
|
"closing parenthesis '%c' does not match "
|
|
"opening parenthesis '%c' on line %d",
|
|
c, opening, tok->parenlinenostack[tok->level]);
|
|
}
|
|
else {
|
|
return syntaxerror(tok,
|
|
"closing parenthesis '%c' does not match "
|
|
"opening parenthesis '%c'",
|
|
c, opening);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* Punctuation character */
|
|
*p_start = tok->start;
|
|
*p_end = tok->cur;
|
|
return PyToken_OneChar(c);
|
|
}
|
|
|
|
int
|
|
PyTokenizer_Get(struct tok_state *tok, const char **p_start, const char **p_end)
|
|
{
|
|
int result = tok_get(tok, p_start, p_end);
|
|
if (tok->decoding_erred) {
|
|
result = ERRORTOKEN;
|
|
tok->done = E_DECODE;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/* 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;
|
|
const char *p_start = NULL;
|
|
const char *p_end = NULL;
|
|
char *encoding = NULL;
|
|
|
|
fd = _Py_dup(fd);
|
|
if (fd < 0) {
|
|
return NULL;
|
|
}
|
|
|
|
fp = fdopen(fd, "r");
|
|
if (fp == NULL) {
|
|
return NULL;
|
|
}
|
|
tok = PyTokenizer_FromFile(fp, NULL, NULL, NULL);
|
|
if (tok == NULL) {
|
|
fclose(fp);
|
|
return NULL;
|
|
}
|
|
if (filename != NULL) {
|
|
Py_INCREF(filename);
|
|
tok->filename = filename;
|
|
}
|
|
else {
|
|
tok->filename = PyUnicode_FromString("<string>");
|
|
if (tok->filename == NULL) {
|
|
fclose(fp);
|
|
PyTokenizer_Free(tok);
|
|
return encoding;
|
|
}
|
|
}
|
|
while (tok->lineno < 2 && tok->done == E_OK) {
|
|
PyTokenizer_Get(tok, &p_start, &p_end);
|
|
}
|
|
fclose(fp);
|
|
if (tok->encoding) {
|
|
encoding = (char *)PyMem_Malloc(strlen(tok->encoding) + 1);
|
|
if (encoding)
|
|
strcpy(encoding, tok->encoding);
|
|
}
|
|
PyTokenizer_Free(tok);
|
|
return encoding;
|
|
}
|
|
|
|
char *
|
|
PyTokenizer_FindEncoding(int fd)
|
|
{
|
|
return PyTokenizer_FindEncodingFilename(fd, NULL);
|
|
}
|
|
|
|
#ifdef Py_DEBUG
|
|
|
|
void
|
|
tok_dump(int type, char *start, char *end)
|
|
{
|
|
printf("%s", _PyParser_TokenNames[type]);
|
|
if (type == NAME || type == NUMBER || type == STRING || type == OP)
|
|
printf("(%.*s)", (int)(end - start), start);
|
|
}
|
|
|
|
#endif
|