mirror of
https://github.com/python/cpython.git
synced 2024-11-28 08:20:55 +01:00
897 lines
17 KiB
C
897 lines
17 KiB
C
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/* Tokenizer implementation */
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#include "pgenheaders.h"
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#include <ctype.h>
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#include "tokenizer.h"
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#include "errcode.h"
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extern char *PyOS_Readline(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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"BACKQUOTE",
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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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/* 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 = PyMem_NEW(struct tok_state, 1);
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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 = 0;
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tok->alterror = 0;
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tok->alttabsize = 1;
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tok->altindstack[0] = 0;
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return tok;
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}
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/* Set up tokenizer for string */
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struct tok_state *
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PyTokenizer_FromString(char *str)
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{
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struct tok_state *tok = tok_new();
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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 = str;
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return tok;
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}
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/* Set up tokenizer for file */
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struct tok_state *
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PyTokenizer_FromFile(FILE *fp, char *ps1, char *ps2)
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{
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struct tok_state *tok = tok_new();
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if (tok == NULL)
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return NULL;
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if ((tok->buf = PyMem_NEW(char, BUFSIZ)) == NULL) {
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PyMem_DEL(tok);
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return NULL;
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}
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tok->cur = tok->inp = tok->buf;
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tok->end = tok->buf + BUFSIZ;
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tok->fp = fp;
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tok->prompt = ps1;
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tok->nextprompt = ps2;
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return tok;
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}
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/* Free a tok_state structure */
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void
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PyTokenizer_Free(struct tok_state *tok)
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{
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if (tok->fp != NULL && tok->buf != NULL)
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PyMem_DEL(tok->buf);
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PyMem_DEL(tok);
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}
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/* Get next char, updating state; error code goes into tok->done */
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static int
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tok_nextc(register struct tok_state *tok)
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{
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for (;;) {
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if (tok->cur != tok->inp) {
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return Py_CHARMASK(*tok->cur++); /* Fast path */
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}
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if (tok->done != E_OK)
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return EOF;
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if (tok->fp == NULL) {
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char *end = strchr(tok->inp, '\n');
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if (end != NULL)
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end++;
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else {
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end = strchr(tok->inp, '\0');
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if (end == tok->inp) {
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tok->done = E_EOF;
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return EOF;
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}
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}
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if (tok->start == NULL)
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tok->buf = tok->cur;
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tok->lineno++;
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tok->inp = end;
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return Py_CHARMASK(*tok->cur++);
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}
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if (tok->prompt != NULL) {
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char *new = PyOS_Readline(tok->prompt);
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if (tok->nextprompt != NULL)
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tok->prompt = tok->nextprompt;
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if (new == NULL)
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tok->done = E_INTR;
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else if (*new == '\0') {
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PyMem_FREE(new);
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tok->done = E_EOF;
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}
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else if (tok->start != NULL) {
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size_t start = tok->start - tok->buf;
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size_t oldlen = tok->cur - tok->buf;
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size_t newlen = oldlen + strlen(new);
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char *buf = tok->buf;
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PyMem_RESIZE(buf, char, newlen+1);
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tok->lineno++;
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if (buf == NULL) {
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PyMem_DEL(tok->buf);
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tok->buf = NULL;
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PyMem_FREE(new);
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tok->done = E_NOMEM;
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return EOF;
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}
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tok->buf = buf;
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tok->cur = tok->buf + oldlen;
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strcpy(tok->buf + oldlen, new);
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PyMem_FREE(new);
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tok->inp = tok->buf + newlen;
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tok->end = tok->inp + 1;
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tok->start = tok->buf + start;
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}
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else {
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tok->lineno++;
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if (tok->buf != NULL)
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PyMem_DEL(tok->buf);
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tok->buf = new;
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tok->cur = tok->buf;
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tok->inp = strchr(tok->buf, '\0');
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tok->end = tok->inp + 1;
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}
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}
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else {
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int done = 0;
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int cur = 0;
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char *pt;
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if (tok->start == NULL) {
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if (tok->buf == NULL) {
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tok->buf = PyMem_NEW(char, BUFSIZ);
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if (tok->buf == NULL) {
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tok->done = E_NOMEM;
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return EOF;
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}
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tok->end = tok->buf + BUFSIZ;
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}
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if (fgets(tok->buf, (int)(tok->end - tok->buf),
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tok->fp) == NULL) {
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tok->done = E_EOF;
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done = 1;
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}
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else {
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tok->done = E_OK;
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tok->inp = strchr(tok->buf, '\0');
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done = tok->inp[-1] == '\n';
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}
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}
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else {
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cur = tok->cur - tok->buf;
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if (feof(tok->fp)) {
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tok->done = E_EOF;
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done = 1;
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}
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else
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tok->done = E_OK;
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}
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tok->lineno++;
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/* Read until '\n' or EOF */
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while (!done) {
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int curstart = tok->start == NULL ? -1 :
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tok->start - tok->buf;
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int curvalid = tok->inp - tok->buf;
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int newsize = curvalid + BUFSIZ;
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char *newbuf = tok->buf;
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PyMem_RESIZE(newbuf, char, newsize);
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if (newbuf == NULL) {
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tok->done = E_NOMEM;
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tok->cur = tok->inp;
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return EOF;
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}
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tok->buf = newbuf;
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tok->inp = tok->buf + curvalid;
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tok->end = tok->buf + newsize;
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tok->start = curstart < 0 ? NULL :
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tok->buf + curstart;
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if (fgets(tok->inp,
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(int)(tok->end - tok->inp),
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tok->fp) == NULL) {
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/* Last line does not end in \n,
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fake one */
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strcpy(tok->inp, "\n");
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}
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tok->inp = strchr(tok->inp, '\0');
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done = tok->inp[-1] == '\n';
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}
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tok->cur = tok->buf + cur;
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#ifndef macintosh
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/* replace "\r\n" with "\n" */
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/* For Mac we leave the \r, giving a syntax error */
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pt = tok->inp - 2;
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if (pt >= tok->buf && *pt == '\r') {
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*pt++ = '\n';
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*pt = '\0';
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tok->inp = pt;
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}
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#endif
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}
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if (tok->done != E_OK) {
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if (tok->prompt != NULL)
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PySys_WriteStderr("\n");
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tok->cur = tok->inp;
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return EOF;
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}
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}
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/*NOTREACHED*/
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}
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/* Back-up one character */
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static void
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tok_backup(register struct tok_state *tok, register int c)
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{
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if (c != EOF) {
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if (--tok->cur < tok->buf)
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Py_FatalError("tok_backup: begin of buffer");
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if (*tok->cur != c)
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*tok->cur = c;
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}
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}
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/* Return the token corresponding to a single character */
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int
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PyToken_OneChar(int c)
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{
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switch (c) {
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case '(': return LPAR;
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case ')': return RPAR;
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case '[': return LSQB;
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case ']': return RSQB;
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case ':': return COLON;
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case ',': return COMMA;
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case ';': return SEMI;
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case '+': return PLUS;
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case '-': return MINUS;
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case '*': return STAR;
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case '/': return SLASH;
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case '|': return VBAR;
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case '&': return AMPER;
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case '<': return LESS;
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case '>': return GREATER;
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case '=': return EQUAL;
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case '.': return DOT;
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case '%': return PERCENT;
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case '`': return BACKQUOTE;
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case '{': return LBRACE;
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case '}': return RBRACE;
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case '^': return CIRCUMFLEX;
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case '~': return TILDE;
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default: return OP;
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}
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}
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int
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PyToken_TwoChars(int c1, int c2)
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{
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switch (c1) {
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case '=':
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switch (c2) {
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case '=': return EQEQUAL;
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}
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break;
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case '!':
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switch (c2) {
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case '=': return NOTEQUAL;
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}
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break;
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case '<':
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switch (c2) {
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case '>': return NOTEQUAL;
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case '=': return LESSEQUAL;
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case '<': return LEFTSHIFT;
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}
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break;
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case '>':
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switch (c2) {
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case '=': return GREATEREQUAL;
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case '>': return RIGHTSHIFT;
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}
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break;
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case '+':
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switch (c2) {
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case '=': return PLUSEQUAL;
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}
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break;
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case '-':
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switch (c2) {
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case '=': return MINEQUAL;
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}
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break;
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case '*':
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switch (c2) {
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case '*': return DOUBLESTAR;
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case '=': return STAREQUAL;
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}
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break;
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case '/':
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switch (c2) {
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case '=': return SLASHEQUAL;
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}
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break;
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case '|':
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switch (c2) {
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case '=': return VBAREQUAL;
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}
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break;
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case '%':
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switch (c2) {
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case '=': return PERCENTEQUAL;
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}
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break;
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case '&':
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switch (c2) {
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case '=': return AMPEREQUAL;
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}
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break;
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case '^':
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switch (c2) {
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case '=': return CIRCUMFLEXEQUAL;
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}
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break;
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}
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return OP;
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}
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int
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PyToken_ThreeChars(int c1, int c2, int c3)
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{
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switch (c1) {
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case '<':
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switch (c2) {
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case '<':
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switch (c3) {
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case '=':
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return LEFTSHIFTEQUAL;
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break;
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}
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break;
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}
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break;
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case '>':
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switch (c2) {
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case '>':
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switch (c3) {
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case '=':
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return RIGHTSHIFTEQUAL;
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break;
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}
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break;
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}
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break;
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case '*':
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switch (c2) {
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case '*':
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switch (c3) {
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case '=':
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return DOUBLESTAREQUAL;
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break;
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}
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break;
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}
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break;
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}
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return OP;
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}
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static int
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indenterror(struct tok_state *tok)
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{
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if (tok->alterror) {
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tok->done = E_TABSPACE;
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tok->cur = tok->inp;
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return 1;
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}
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if (tok->altwarning) {
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PySys_WriteStderr("%s: inconsistent use of tabs and spaces "
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"in indentation\n", tok->filename);
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tok->altwarning = 0;
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}
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return 0;
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}
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/* Get next token, after space stripping etc. */
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int
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PyTokenizer_Get(register struct tok_state *tok, char **p_start,
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char **p_end)
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{
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register int c;
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int blankline;
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*p_start = *p_end = NULL;
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nextline:
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tok->start = NULL;
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blankline = 0;
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/* Get indentation level */
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if (tok->atbol) {
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register int col = 0;
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register int altcol = 0;
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tok->atbol = 0;
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for (;;) {
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c = tok_nextc(tok);
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if (c == ' ')
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col++, altcol++;
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else if (c == '\t') {
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col = (col/tok->tabsize + 1) * tok->tabsize;
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altcol = (altcol/tok->alttabsize + 1)
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* tok->alttabsize;
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}
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else if (c == '\014') /* Control-L (formfeed) */
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col = altcol = 0; /* For Emacs users */
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else
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break;
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}
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tok_backup(tok, c);
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if (c == '#' || c == '\n') {
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/* Lines with only whitespace and/or comments
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shouldn't affect the indentation and are
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not passed to the parser as NEWLINE tokens,
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except *totally* empty lines in interactive
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mode, which signal the end of a command group. */
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if (col == 0 && c == '\n' && tok->prompt != NULL)
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blankline = 0; /* Let it through */
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else
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blankline = 1; /* Ignore completely */
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/* We can't jump back right here since we still
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may need to skip to the end of a comment */
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}
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if (!blankline && tok->level == 0) {
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if (col == tok->indstack[tok->indent]) {
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/* No change */
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if (altcol != tok->altindstack[tok->indent]) {
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if (indenterror(tok))
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return ERRORTOKEN;
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}
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}
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else if (col > tok->indstack[tok->indent]) {
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/* Indent -- always one */
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if (tok->indent+1 >= MAXINDENT) {
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tok->done = E_TOODEEP;
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tok->cur = tok->inp;
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return ERRORTOKEN;
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}
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if (altcol <= tok->altindstack[tok->indent]) {
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if (indenterror(tok))
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return ERRORTOKEN;
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}
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tok->pendin++;
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tok->indstack[++tok->indent] = col;
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tok->altindstack[tok->indent] = altcol;
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}
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else /* col < tok->indstack[tok->indent] */ {
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/* Dedent -- any number, must be consistent */
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while (tok->indent > 0 &&
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col < tok->indstack[tok->indent]) {
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tok->pendin--;
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tok->indent--;
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}
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if (col != tok->indstack[tok->indent]) {
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tok->done = E_DEDENT;
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tok->cur = tok->inp;
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return ERRORTOKEN;
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}
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if (altcol != tok->altindstack[tok->indent]) {
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if (indenterror(tok))
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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, while looking for tab-setting magic */
|
|
if (c == '#') {
|
|
static char *tabforms[] = {
|
|
"tab-width:", /* Emacs */
|
|
":tabstop=", /* vim, full form */
|
|
":ts=", /* vim, abbreviated form */
|
|
"set tabsize=", /* will vi never die? */
|
|
/* more templates can be added here to support other editors */
|
|
};
|
|
char cbuf[80];
|
|
char *tp, **cp;
|
|
tp = cbuf;
|
|
do {
|
|
*tp++ = c = tok_nextc(tok);
|
|
} while (c != EOF && c != '\n' &&
|
|
tp - cbuf + 1 < sizeof(cbuf));
|
|
*tp = '\0';
|
|
for (cp = tabforms;
|
|
cp < tabforms + sizeof(tabforms)/sizeof(tabforms[0]);
|
|
cp++) {
|
|
if ((tp = strstr(cbuf, *cp))) {
|
|
int newsize = atoi(tp + strlen(*cp));
|
|
|
|
if (newsize >= 1 && newsize <= 40) {
|
|
tok->tabsize = newsize;
|
|
if (Py_VerboseFlag)
|
|
PySys_WriteStderr(
|
|
"Tab size set to %d\n",
|
|
newsize);
|
|
}
|
|
}
|
|
}
|
|
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!) */
|
|
if (isalpha(c) || c == '_') {
|
|
/* Process r"", u"" and ur"" */
|
|
switch (c) {
|
|
case 'r':
|
|
case 'R':
|
|
c = tok_nextc(tok);
|
|
if (c == '"' || c == '\'')
|
|
goto letter_quote;
|
|
break;
|
|
case 'u':
|
|
case 'U':
|
|
c = tok_nextc(tok);
|
|
if (c == 'r' || c == 'R')
|
|
c = tok_nextc(tok);
|
|
if (c == '"' || c == '\'')
|
|
goto letter_quote;
|
|
break;
|
|
}
|
|
while (isalnum(c) || c == '_') {
|
|
c = tok_nextc(tok);
|
|
}
|
|
tok_backup(tok, c);
|
|
*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 */
|
|
return NEWLINE;
|
|
}
|
|
|
|
#ifdef macintosh
|
|
if (c == '\r') {
|
|
PySys_WriteStderr(
|
|
"File contains \\r characters (incorrect line endings?)\n");
|
|
tok->done = E_TOKEN;
|
|
tok->cur = tok->inp;
|
|
return ERRORTOKEN;
|
|
}
|
|
#endif
|
|
/* Period or number starting with period? */
|
|
if (c == '.') {
|
|
c = tok_nextc(tok);
|
|
if (isdigit(c)) {
|
|
goto fraction;
|
|
}
|
|
else {
|
|
tok_backup(tok, c);
|
|
*p_start = tok->start;
|
|
*p_end = tok->cur;
|
|
return DOT;
|
|
}
|
|
}
|
|
|
|
/* Number */
|
|
if (isdigit(c)) {
|
|
if (c == '0') {
|
|
/* Hex or octal */
|
|
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 {
|
|
/* XXX This is broken! E.g.,
|
|
09.9 should be accepted as float! */
|
|
/* Octal; c is first char of it */
|
|
/* There's no 'isoctdigit' macro, sigh */
|
|
while ('0' <= c && c < '8') {
|
|
c = tok_nextc(tok);
|
|
}
|
|
}
|
|
if (c == 'l' || c == 'L')
|
|
c = tok_nextc(tok);
|
|
}
|
|
else {
|
|
/* Decimal */
|
|
do {
|
|
c = tok_nextc(tok);
|
|
} while (isdigit(c));
|
|
if (c == 'l' || c == 'L')
|
|
c = tok_nextc(tok);
|
|
else {
|
|
/* Accept floating point numbers.
|
|
XXX This accepts incomplete things like
|
|
XXX 12e or 1e+; worry run-time */
|
|
if (c == '.') {
|
|
fraction:
|
|
/* Fraction */
|
|
do {
|
|
c = tok_nextc(tok);
|
|
} while (isdigit(c));
|
|
}
|
|
if (c == 'e' || c == 'E') {
|
|
/* Exponent part */
|
|
c = tok_nextc(tok);
|
|
if (c == '+' || c == '-')
|
|
c = tok_nextc(tok);
|
|
while (isdigit(c)) {
|
|
c = tok_nextc(tok);
|
|
}
|
|
}
|
|
#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 == '"') {
|
|
int 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_TOKEN;
|
|
tok_backup(tok, c);
|
|
return ERRORTOKEN;
|
|
}
|
|
tripcount = 0;
|
|
}
|
|
else if (c == EOF) {
|
|
tok->done = E_TOKEN;
|
|
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_TOKEN;
|
|
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_TOKEN;
|
|
tok->cur = tok->inp;
|
|
return ERRORTOKEN;
|
|
}
|
|
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);
|
|
}
|
|
|
|
|
|
#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
|