mirror of
https://github.com/python/cpython.git
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1509 lines
32 KiB
C
1509 lines
32 KiB
C
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/* Tokenizer implementation */
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#include "Python.h"
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#include "pgenheaders.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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#ifndef PGEN
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#include "unicodeobject.h"
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#include "stringobject.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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#endif /* PGEN */
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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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extern char *PyOS_Readline(FILE *, FILE *, char *);
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/* Return malloc'ed string including trailing \n;
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empty malloc'ed string for EOF;
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NULL if interrupted */
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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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/* Convert a possibly signed character to a nonnegative int */
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/* XXX This assumes characters are 8 bits wide */
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#ifdef __CHAR_UNSIGNED__
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#define Py_CHARMASK(c) (c)
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#else
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#define Py_CHARMASK(c) ((c) & 0xff)
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#endif
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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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/* Token names */
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char *_PyParser_TokenNames[] = {
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"ENDMARKER",
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"NAME",
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"NUMBER",
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"STRING",
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"NEWLINE",
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"INDENT",
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"DEDENT",
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"LPAR",
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"RPAR",
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"LSQB",
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"RSQB",
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"COLON",
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"COMMA",
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"SEMI",
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"PLUS",
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"MINUS",
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"STAR",
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"SLASH",
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"VBAR",
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"AMPER",
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"LESS",
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"GREATER",
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"EQUAL",
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"DOT",
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"PERCENT",
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"LBRACE",
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"RBRACE",
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"EQEQUAL",
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"NOTEQUAL",
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"LESSEQUAL",
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"GREATEREQUAL",
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"TILDE",
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"CIRCUMFLEX",
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"LEFTSHIFT",
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"RIGHTSHIFT",
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"DOUBLESTAR",
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"PLUSEQUAL",
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"MINEQUAL",
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"STAREQUAL",
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"SLASHEQUAL",
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"PERCENTEQUAL",
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"AMPEREQUAL",
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"VBAREQUAL",
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"CIRCUMFLEXEQUAL",
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"LEFTSHIFTEQUAL",
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"RIGHTSHIFTEQUAL",
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"DOUBLESTAREQUAL",
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"DOUBLESLASH",
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"DOUBLESLASHEQUAL",
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"AT",
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"RARROW",
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"ELLIPSIS",
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/* This table must match the #defines in token.h! */
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"OP",
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"<ERRORTOKEN>",
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"<N_TOKENS>"
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};
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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->end = tok->inp = tok->start = NULL;
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tok->done = E_OK;
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tok->fp = 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->filename = NULL;
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tok->altwarning = 1;
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tok->alterror = 1;
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tok->alttabsize = 1;
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tok->altindstack[0] = 0;
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tok->decoding_state = 0;
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tok->decoding_erred = 0;
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tok->read_coding_spec = 0;
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tok->encoding = NULL;
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tok->cont_line = 0;
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#ifndef PGEN
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tok->decoding_readline = NULL;
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tok->decoding_buffer = NULL;
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#endif
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return tok;
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}
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#ifdef PGEN
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static char *
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decoding_fgets(char *s, int size, struct tok_state *tok)
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{
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return fgets(s, size, tok->fp);
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}
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static int
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decoding_feof(struct tok_state *tok)
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{
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return feof(tok->fp);
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}
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static const char *
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decode_str(const char *str, struct tok_state *tok)
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{
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return str;
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}
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#else /* PGEN */
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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 = NULL;
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return NULL; /* as if it were EOF */
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}
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static char *
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new_string(const char *s, Py_ssize_t len)
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{
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char* result = (char *)PyMem_MALLOC(len + 1);
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if (result != NULL) {
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memcpy(result, s, len);
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result[len] = '\0';
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}
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return result;
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}
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static char *
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get_normal_name(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') break;
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else if (c == '_') buf[i] = '-';
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else 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) 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) return "iso-8859-1";
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else 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 char *
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get_coding_spec(const char *s, Py_ssize_t size)
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{
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Py_ssize_t i;
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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 NULL;
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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 (isalnum(Py_CHARMASK(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);
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char* 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));
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}
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return r;
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}
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}
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}
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return NULL;
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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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return 1;
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cs = get_coding_spec(line, size);
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if (cs != NULL) {
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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 == 1); /* raw */
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if (strcmp(cs, "utf-8") == 0 ||
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strcmp(cs, "iso-8859-1") == 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 = -1;
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}
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else
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PyMem_FREE(cs);
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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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PyMem_FREE(cs);
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}
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}
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if (!r) {
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cs = tok->encoding;
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if (!cs)
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cs = "with BOM";
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PyErr_Format(PyExc_SyntaxError, "encoding problem: %s", 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 ch = get_char(tok);
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tok->decoding_state = 1;
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if (ch == EOF) {
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return 1;
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} else if (ch == 0xEF) {
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ch = get_char(tok); if (ch != 0xBB) goto NON_BOM;
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ch = get_char(tok); if (ch != 0xBF) goto NON_BOM;
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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 (ch == 0xFE) {
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ch = get_char(tok); if (ch != 0xFF) goto NON_BOM;
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if (!set_readline(tok, "utf-16-be")) return 0;
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tok->decoding_state = -1;
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} else if (ch == 0xFF) {
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ch = get_char(tok); if (ch != 0xFE) goto NON_BOM;
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if (!set_readline(tok, "utf-16-le")) return 0;
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tok->decoding_state = -1;
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#endif
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} else {
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unget_char(ch, 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); /* resulting is in utf-8 */
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return 1;
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NON_BOM:
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/* any token beginning with '\xEF', '\xFE', '\xFF' is a bad token */
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unget_char(0xFF, tok); /* XXX this will cause a syntax error */
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return 1;
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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) PyStringObject *: 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 = tok->decoding_buffer;
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const char *buf;
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Py_ssize_t buflen;
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int allocated = 0;
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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 (bufobj == NULL) {
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bufobj = PyObject_CallObject(tok->decoding_readline, NULL);
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if (bufobj == NULL)
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goto error;
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allocated = 1;
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}
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if (PyObject_AsCharBuffer(bufobj, &buf, &buflen) < 0) {
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goto error;
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}
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if (buflen > size) {
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Py_XDECREF(tok->decoding_buffer);
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tok->decoding_buffer = PyBytes_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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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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if (allocated) {
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Py_DECREF(bufobj);
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}
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return s;
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error:
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if (allocated) {
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Py_XDECREF(bufobj);
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}
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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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|
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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 = NULL, *stream = NULL, *io = NULL;
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|
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io = PyImport_ImportModule("io");
|
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if (io == NULL)
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goto cleanup;
|
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|
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stream = PyObject_CallMethod(io, "open", "ssis",
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tok->filename, "r", -1, enc);
|
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if (stream == NULL)
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goto cleanup;
|
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|
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Py_XDECREF(tok->decoding_readline);
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readline = PyObject_GetAttrString(stream, "readline");
|
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tok->decoding_readline = readline;
|
|
|
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cleanup:
|
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Py_XDECREF(stream);
|
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Py_XDECREF(io);
|
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return readline != NULL;
|
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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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}
|
|
|
|
/* 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);
|
|
}
|
|
|
|
/* 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. */
|
|
static int valid_utf8(const unsigned char* s)
|
|
{
|
|
int expected = 0;
|
|
int length;
|
|
if (*s < 0x80)
|
|
/* single-byte code */
|
|
return 1;
|
|
if (*s < 0xc0)
|
|
/* following byte */
|
|
return 0;
|
|
if (*s < 0xE0)
|
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expected = 1;
|
|
else if (*s < 0xF0)
|
|
expected = 2;
|
|
else if (*s < 0xF8)
|
|
expected = 3;
|
|
else
|
|
return 0;
|
|
length = expected + 1;
|
|
for (; expected; expected--)
|
|
if (s[expected] < 0x80 || s[expected] >= 0xC0)
|
|
return 0;
|
|
return length;
|
|
}
|
|
|
|
/* Read a line of input from TOK. Determine encoding
|
|
if necessary. */
|
|
|
|
static char *
|
|
decoding_fgets(char *s, int size, struct tok_state *tok)
|
|
{
|
|
char *line = NULL;
|
|
int badchar = 0;
|
|
for (;;) {
|
|
if (tok->decoding_state < 0) {
|
|
/* We already have a codec associated with
|
|
this input. */
|
|
line = fp_readl(s, size, tok);
|
|
break;
|
|
} else if (tok->decoding_state > 0) {
|
|
/* We want a 'raw' read. */
|
|
line = Py_UniversalNewlineFgets(s, size,
|
|
tok->fp, NULL);
|
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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 != 0);
|
|
}
|
|
}
|
|
if (line != NULL && tok->lineno < 2 && !tok->read_coding_spec) {
|
|
if (!check_coding_spec(line, strlen(line), tok, fp_setreadl)) {
|
|
return error_ret(tok);
|
|
}
|
|
}
|
|
#ifndef PGEN
|
|
/* 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) {
|
|
char buf[500];
|
|
/* Need to add 1 to the line number, since this line
|
|
has not been counted, yet. */
|
|
sprintf(buf,
|
|
"Non-UTF-8 code starting with '\\x%.2x' "
|
|
"in file %.200s on line %i, "
|
|
"but no encoding declared; "
|
|
"see http://www.python.org/peps/pep-0263.html for details",
|
|
badchar, tok->filename, tok->lineno + 1);
|
|
PyErr_SetString(PyExc_SyntaxError, buf);
|
|
return error_ret(tok);
|
|
}
|
|
#endif
|
|
return line;
|
|
}
|
|
|
|
static int
|
|
decoding_feof(struct tok_state *tok)
|
|
{
|
|
if (tok->decoding_state >= 0) {
|
|
return feof(tok->fp);
|
|
} else {
|
|
PyObject* buf = tok->decoding_buffer;
|
|
if (buf == NULL) {
|
|
buf = PyObject_CallObject(tok->decoding_readline, NULL);
|
|
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;
|
|
}
|
|
|
|
/* Decode a byte string STR for use as the buffer of TOK.
|
|
Look for encoding declarations inside STR, and record them
|
|
inside TOK. */
|
|
|
|
static const char *
|
|
decode_str(const char *str, struct tok_state *tok)
|
|
{
|
|
PyObject* utf8 = NULL;
|
|
const char *s;
|
|
int lineno = 0;
|
|
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 = PyString_AsString(utf8);
|
|
}
|
|
for (s = str;; s++) {
|
|
if (*s == '\0') break;
|
|
else if (*s == '\n') {
|
|
lineno++;
|
|
if (lineno == 2) break;
|
|
}
|
|
}
|
|
tok->enc = NULL;
|
|
if (!check_coding_spec(str, s - str, tok, buf_setreadl))
|
|
return error_ret(tok);
|
|
if (tok->enc != NULL) {
|
|
assert(utf8 == NULL);
|
|
utf8 = translate_into_utf8(str, tok->enc);
|
|
if (utf8 == NULL) {
|
|
PyErr_Format(PyExc_SyntaxError,
|
|
"unknown encoding: %s", tok->enc);
|
|
return error_ret(tok);
|
|
}
|
|
str = PyBytes_AsString(utf8);
|
|
}
|
|
assert(tok->decoding_buffer == NULL);
|
|
tok->decoding_buffer = utf8; /* CAUTION */
|
|
return str;
|
|
}
|
|
|
|
#endif /* PGEN */
|
|
|
|
/* Set up tokenizer for string */
|
|
|
|
struct tok_state *
|
|
PyTokenizer_FromString(const char *str)
|
|
{
|
|
struct tok_state *tok = tok_new();
|
|
if (tok == NULL)
|
|
return NULL;
|
|
str = (char *)decode_str(str, tok);
|
|
if (str == NULL) {
|
|
PyTokenizer_Free(tok);
|
|
return NULL;
|
|
}
|
|
|
|
/* XXX: constify members. */
|
|
tok->buf = tok->cur = tok->end = tok->inp = (char*)str;
|
|
return tok;
|
|
}
|
|
|
|
|
|
/* Set up tokenizer for file */
|
|
|
|
struct tok_state *
|
|
PyTokenizer_FromFile(FILE *fp, char *ps1, 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;
|
|
return tok;
|
|
}
|
|
|
|
|
|
/* Free a tok_state structure */
|
|
|
|
void
|
|
PyTokenizer_Free(struct tok_state *tok)
|
|
{
|
|
if (tok->encoding != NULL)
|
|
PyMem_FREE(tok->encoding);
|
|
#ifndef PGEN
|
|
Py_XDECREF(tok->decoding_readline);
|
|
Py_XDECREF(tok->decoding_buffer);
|
|
#endif
|
|
if (tok->fp != NULL && tok->buf != NULL)
|
|
PyMem_FREE(tok->buf);
|
|
PyMem_FREE(tok);
|
|
}
|
|
|
|
/* Get next char, updating state; error code goes into tok->done */
|
|
|
|
static int
|
|
tok_nextc(register 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 (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);
|
|
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->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->line_start = tok->buf;
|
|
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) {
|
|
tok->done = E_EOF;
|
|
done = 1;
|
|
}
|
|
else {
|
|
tok->done = E_OK;
|
|
tok->inp = strchr(tok->buf, '\0');
|
|
done = 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 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->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 */
|
|
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(register struct tok_state *tok, register int c)
|
|
{
|
|
if (c != EOF) {
|
|
if (--tok->cur < tok->buf)
|
|
Py_FatalError("tok_backup: begin of buffer");
|
|
if (*tok->cur != c)
|
|
*tok->cur = c;
|
|
}
|
|
}
|
|
|
|
|
|
/* Return the token corresponding to a single character */
|
|
|
|
int
|
|
PyToken_OneChar(int c)
|
|
{
|
|
switch (c) {
|
|
case '(': return LPAR;
|
|
case ')': return RPAR;
|
|
case '[': return LSQB;
|
|
case ']': return RSQB;
|
|
case ':': return COLON;
|
|
case ',': return COMMA;
|
|
case ';': return SEMI;
|
|
case '+': return PLUS;
|
|
case '-': return MINUS;
|
|
case '*': return STAR;
|
|
case '/': return SLASH;
|
|
case '|': return VBAR;
|
|
case '&': return AMPER;
|
|
case '<': return LESS;
|
|
case '>': return GREATER;
|
|
case '=': return EQUAL;
|
|
case '.': return DOT;
|
|
case '%': return PERCENT;
|
|
case '{': return LBRACE;
|
|
case '}': return RBRACE;
|
|
case '^': return CIRCUMFLEX;
|
|
case '~': return TILDE;
|
|
case '@': return AT;
|
|
default: return OP;
|
|
}
|
|
}
|
|
|
|
|
|
int
|
|
PyToken_TwoChars(int c1, int c2)
|
|
{
|
|
switch (c1) {
|
|
case '=':
|
|
switch (c2) {
|
|
case '=': return EQEQUAL;
|
|
}
|
|
break;
|
|
case '!':
|
|
switch (c2) {
|
|
case '=': return NOTEQUAL;
|
|
}
|
|
break;
|
|
case '<':
|
|
switch (c2) {
|
|
case '=': return LESSEQUAL;
|
|
case '<': return LEFTSHIFT;
|
|
}
|
|
break;
|
|
case '>':
|
|
switch (c2) {
|
|
case '=': return GREATEREQUAL;
|
|
case '>': return RIGHTSHIFT;
|
|
}
|
|
break;
|
|
case '+':
|
|
switch (c2) {
|
|
case '=': return PLUSEQUAL;
|
|
}
|
|
break;
|
|
case '-':
|
|
switch (c2) {
|
|
case '=': return MINEQUAL;
|
|
case '>': return RARROW;
|
|
}
|
|
break;
|
|
case '*':
|
|
switch (c2) {
|
|
case '*': return DOUBLESTAR;
|
|
case '=': return STAREQUAL;
|
|
}
|
|
break;
|
|
case '/':
|
|
switch (c2) {
|
|
case '/': return DOUBLESLASH;
|
|
case '=': return SLASHEQUAL;
|
|
}
|
|
break;
|
|
case '|':
|
|
switch (c2) {
|
|
case '=': return VBAREQUAL;
|
|
}
|
|
break;
|
|
case '%':
|
|
switch (c2) {
|
|
case '=': return PERCENTEQUAL;
|
|
}
|
|
break;
|
|
case '&':
|
|
switch (c2) {
|
|
case '=': return AMPEREQUAL;
|
|
}
|
|
break;
|
|
case '^':
|
|
switch (c2) {
|
|
case '=': return CIRCUMFLEXEQUAL;
|
|
}
|
|
break;
|
|
}
|
|
return OP;
|
|
}
|
|
|
|
int
|
|
PyToken_ThreeChars(int c1, int c2, int c3)
|
|
{
|
|
switch (c1) {
|
|
case '<':
|
|
switch (c2) {
|
|
case '<':
|
|
switch (c3) {
|
|
case '=':
|
|
return LEFTSHIFTEQUAL;
|
|
}
|
|
break;
|
|
}
|
|
break;
|
|
case '>':
|
|
switch (c2) {
|
|
case '>':
|
|
switch (c3) {
|
|
case '=':
|
|
return RIGHTSHIFTEQUAL;
|
|
}
|
|
break;
|
|
}
|
|
break;
|
|
case '*':
|
|
switch (c2) {
|
|
case '*':
|
|
switch (c3) {
|
|
case '=':
|
|
return DOUBLESTAREQUAL;
|
|
}
|
|
break;
|
|
}
|
|
break;
|
|
case '/':
|
|
switch (c2) {
|
|
case '/':
|
|
switch (c3) {
|
|
case '=':
|
|
return DOUBLESLASHEQUAL;
|
|
}
|
|
break;
|
|
}
|
|
break;
|
|
case '.':
|
|
switch (c2) {
|
|
case '.':
|
|
switch (c3) {
|
|
case '.':
|
|
return ELLIPSIS;
|
|
}
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
return OP;
|
|
}
|
|
|
|
static int
|
|
indenterror(struct tok_state *tok)
|
|
{
|
|
if (tok->alterror) {
|
|
tok->done = E_TABSPACE;
|
|
tok->cur = tok->inp;
|
|
return 1;
|
|
}
|
|
if (tok->altwarning) {
|
|
PySys_WriteStderr("%s: inconsistent use of tabs and spaces "
|
|
"in indentation\n", tok->filename);
|
|
tok->altwarning = 0;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#ifdef PGEN
|
|
#define verify_identifier(s,e) 1
|
|
#else
|
|
/* Verify that the identifier follows PEP 3131. */
|
|
static int
|
|
verify_identifier(char *start, char *end)
|
|
{
|
|
PyObject *s = PyUnicode_DecodeUTF8(start, end-start, NULL);
|
|
int result = PyUnicode_IsIdentifier(s);
|
|
Py_DECREF(s);
|
|
return result;
|
|
}
|
|
#endif
|
|
|
|
/* Get next token, after space stripping etc. */
|
|
|
|
static int
|
|
tok_get(register struct tok_state *tok, char **p_start, char **p_end)
|
|
{
|
|
register int c;
|
|
int blankline, nonascii;
|
|
|
|
*p_start = *p_end = NULL;
|
|
nextline:
|
|
tok->start = NULL;
|
|
blankline = 0;
|
|
|
|
/* Get indentation level */
|
|
if (tok->atbol) {
|
|
register int col = 0;
|
|
register 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/tok->alttabsize + 1)
|
|
* tok->alttabsize;
|
|
}
|
|
else if (c == '\014') /* Control-L (formfeed) */
|
|
col = altcol = 0; /* For Emacs users */
|
|
else
|
|
break;
|
|
}
|
|
tok_backup(tok, c);
|
|
if (c == '#' || c == '\n') {
|
|
/* Lines with only whitespace and/or comments
|
|
shouldn't affect the indentation and are
|
|
not passed to the parser as NEWLINE tokens,
|
|
except *totally* empty lines in interactive
|
|
mode, which signal the end of a command group. */
|
|
if (col == 0 && c == '\n' && tok->prompt != NULL)
|
|
blankline = 0; /* Let it through */
|
|
else
|
|
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]) {
|
|
if (indenterror(tok))
|
|
return ERRORTOKEN;
|
|
}
|
|
}
|
|
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]) {
|
|
if (indenterror(tok))
|
|
return ERRORTOKEN;
|
|
}
|
|
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]) {
|
|
if (indenterror(tok))
|
|
return ERRORTOKEN;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
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;
|
|
}
|
|
}
|
|
|
|
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 */
|
|
if (c == '#')
|
|
while (c != EOF && c != '\n')
|
|
c = tok_nextc(tok);
|
|
|
|
/* Check for EOF and errors now */
|
|
if (c == EOF) {
|
|
return tok->done == E_EOF ? ENDMARKER : ERRORTOKEN;
|
|
}
|
|
|
|
/* Identifier (most frequent token!) */
|
|
nonascii = 0;
|
|
if (is_potential_identifier_start(c)) {
|
|
/* Process r"", u"" and ur"" */
|
|
switch (c) {
|
|
case 'r':
|
|
case 'R':
|
|
c = tok_nextc(tok);
|
|
if (c == '"' || c == '\'')
|
|
goto letter_quote;
|
|
break;
|
|
case 'b':
|
|
case 'B':
|
|
c = tok_nextc(tok);
|
|
if (c == 'r' || c == 'R')
|
|
c = tok_nextc(tok);
|
|
if (c == '"' || c == '\'')
|
|
goto letter_quote;
|
|
break;
|
|
}
|
|
while (is_potential_identifier_char(c)) {
|
|
if (c >= 128)
|
|
nonascii = 1;
|
|
c = tok_nextc(tok);
|
|
}
|
|
tok_backup(tok, c);
|
|
if (nonascii &&
|
|
!verify_identifier(tok->start, tok->cur)) {
|
|
tok->done = E_IDENTIFIER;
|
|
return ERRORTOKEN;
|
|
}
|
|
*p_start = tok->start;
|
|
*p_end = tok->cur;
|
|
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;
|
|
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 == '.')
|
|
goto fraction;
|
|
#ifndef WITHOUT_COMPLEX
|
|
if (c == 'j' || c == 'J')
|
|
goto imaginary;
|
|
#endif
|
|
if (c == 'x' || c == 'X') {
|
|
/* Hex */
|
|
do {
|
|
c = tok_nextc(tok);
|
|
} while (isxdigit(c));
|
|
}
|
|
else if (c == 'o' || c == 'O') {
|
|
/* Octal */
|
|
do {
|
|
c = tok_nextc(tok);
|
|
} while ('0' <= c && c < '8');
|
|
}
|
|
else if (c == 'b' || c == 'B') {
|
|
/* Binary */
|
|
do {
|
|
c = tok_nextc(tok);
|
|
} while (c == '0' || c == '1');
|
|
}
|
|
else {
|
|
int nonzero = 0;
|
|
/* maybe old-style octal; c is first char of it */
|
|
/* in any case, allow '0' as a literal */
|
|
while (c == '0')
|
|
c = tok_nextc(tok);
|
|
while (isdigit(c)) {
|
|
nonzero = 1;
|
|
c = tok_nextc(tok);
|
|
}
|
|
if (c == '.')
|
|
goto fraction;
|
|
else if (c == 'e' || c == 'E')
|
|
goto exponent;
|
|
#ifndef WITHOUT_COMPLEX
|
|
else if (c == 'j' || c == 'J')
|
|
goto imaginary;
|
|
#endif
|
|
else if (nonzero) {
|
|
tok->done = E_TOKEN;
|
|
tok_backup(tok, c);
|
|
return ERRORTOKEN;
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
/* Decimal */
|
|
do {
|
|
c = tok_nextc(tok);
|
|
} while (isdigit(c));
|
|
{
|
|
/* Accept floating point numbers. */
|
|
if (c == '.') {
|
|
fraction:
|
|
/* Fraction */
|
|
do {
|
|
c = tok_nextc(tok);
|
|
} while (isdigit(c));
|
|
}
|
|
if (c == 'e' || c == 'E') {
|
|
exponent:
|
|
/* Exponent part */
|
|
c = tok_nextc(tok);
|
|
if (c == '+' || c == '-')
|
|
c = tok_nextc(tok);
|
|
if (!isdigit(c)) {
|
|
tok->done = E_TOKEN;
|
|
tok_backup(tok, c);
|
|
return ERRORTOKEN;
|
|
}
|
|
do {
|
|
c = tok_nextc(tok);
|
|
} while (isdigit(c));
|
|
}
|
|
#ifndef WITHOUT_COMPLEX
|
|
if (c == 'j' || c == 'J')
|
|
/* Imaginary part */
|
|
imaginary:
|
|
c = tok_nextc(tok);
|
|
#endif
|
|
}
|
|
}
|
|
tok_backup(tok, c);
|
|
*p_start = tok->start;
|
|
*p_end = tok->cur;
|
|
return NUMBER;
|
|
}
|
|
|
|
letter_quote:
|
|
/* String */
|
|
if (c == '\'' || c == '"') {
|
|
Py_ssize_t quote2 = tok->cur - tok->start + 1;
|
|
int quote = c;
|
|
int triple = 0;
|
|
int tripcount = 0;
|
|
for (;;) {
|
|
c = tok_nextc(tok);
|
|
if (c == '\n') {
|
|
if (!triple) {
|
|
tok->done = E_EOLS;
|
|
tok_backup(tok, c);
|
|
return ERRORTOKEN;
|
|
}
|
|
tripcount = 0;
|
|
tok->cont_line = 1; /* multiline string. */
|
|
}
|
|
else if (c == EOF) {
|
|
if (triple)
|
|
tok->done = E_EOFS;
|
|
else
|
|
tok->done = E_EOLS;
|
|
tok->cur = tok->inp;
|
|
return ERRORTOKEN;
|
|
}
|
|
else if (c == quote) {
|
|
tripcount++;
|
|
if (tok->cur - tok->start == quote2) {
|
|
c = tok_nextc(tok);
|
|
if (c == quote) {
|
|
triple = 1;
|
|
tripcount = 0;
|
|
continue;
|
|
}
|
|
tok_backup(tok, c);
|
|
}
|
|
if (!triple || tripcount == 3)
|
|
break;
|
|
}
|
|
else if (c == '\\') {
|
|
tripcount = 0;
|
|
c = tok_nextc(tok);
|
|
if (c == EOF) {
|
|
tok->done = E_EOLS;
|
|
tok->cur = tok->inp;
|
|
return ERRORTOKEN;
|
|
}
|
|
}
|
|
else
|
|
tripcount = 0;
|
|
}
|
|
*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;
|
|
}
|
|
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 '{':
|
|
tok->level++;
|
|
break;
|
|
case ')':
|
|
case ']':
|
|
case '}':
|
|
tok->level--;
|
|
break;
|
|
}
|
|
|
|
/* Punctuation character */
|
|
*p_start = tok->start;
|
|
*p_end = tok->cur;
|
|
return PyToken_OneChar(c);
|
|
}
|
|
|
|
int
|
|
PyTokenizer_Get(struct tok_state *tok, char **p_start, char **p_end)
|
|
{
|
|
int result = tok_get(tok, p_start, p_end);
|
|
if (tok->decoding_erred) {
|
|
result = ERRORTOKEN;
|
|
tok->done = E_DECODE;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
#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
|