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720 lines
15 KiB
C
720 lines
15 KiB
C
/***********************************************************
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Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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The Netherlands.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the names of Stichting Mathematisch
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Centrum or CWI not be used in advertising or publicity pertaining to
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distribution of the software without specific, written prior permission.
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STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
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THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
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FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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******************************************************************/
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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 *my_readline PROTO((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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/* Forward */
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static struct tok_state *tok_new PROTO((void));
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static int tok_nextc PROTO((struct tok_state *tok));
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static void tok_backup PROTO((struct tok_state *tok, int c));
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/* Token names */
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char *tok_name[] = {
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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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/* 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()
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{
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struct tok_state *tok = 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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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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tok_setups(str)
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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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tok_setupf(fp, ps1, ps2)
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FILE *fp;
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char *ps1, *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 = NEW(char, BUFSIZ)) == NULL) {
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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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tok_free(tok)
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struct tok_state *tok;
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{
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if (tok->fp != NULL && tok->buf != NULL)
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DEL(tok->buf);
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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(tok)
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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 *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 *tok->cur++;
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}
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if (tok->prompt != NULL) {
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char *new = my_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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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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int start = tok->start - tok->buf;
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int oldlen = tok->cur - tok->buf;
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int newlen = oldlen + strlen(new);
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char *buf = realloc(tok->buf, newlen+1);
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tok->lineno++;
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if (buf == NULL) {
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free(tok->buf);
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tok->buf = NULL;
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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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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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free(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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if (tok->start == NULL) {
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if (tok->buf == NULL) {
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tok->buf = 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 cursize = tok->end - tok->buf;
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int newsize = cursize + BUFSIZ;
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char *newbuf = tok->buf;
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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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}
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if (tok->done != E_OK) {
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if (tok->prompt != NULL)
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fprintf(stderr, "\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(tok, c)
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register struct tok_state *tok;
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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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fatal("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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tok_1char(c)
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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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tok_2char(c1, c2)
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int c1, 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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}
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return OP;
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}
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/* Get next token, after space stripping etc. */
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int
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tok_get(tok, p_start, p_end)
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register struct tok_state *tok; /* In/out: tokenizer state */
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char **p_start, **p_end; /* Out: point to start/end of token */
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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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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++;
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else if (c == '\t')
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col = (col/tok->tabsize + 1) * tok->tabsize;
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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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}
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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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fprintf(stderr, "excessive indent\n");
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tok->done = E_TOKEN;
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tok->cur = tok->inp;
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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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}
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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->indent--;
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tok->pendin--;
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}
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if (col != tok->indstack[tok->indent]) {
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fprintf(stderr, "inconsistent dedent\n");
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tok->done = E_TOKEN;
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tok->cur = tok->inp;
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return ERRORTOKEN;
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}
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}
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}
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}
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tok->start = tok->cur;
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/* Return pending indents/dedents */
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if (tok->pendin != 0) {
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if (tok->pendin < 0) {
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tok->pendin++;
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return DEDENT;
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}
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else {
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tok->pendin--;
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return INDENT;
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}
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}
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again:
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tok->start = NULL;
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/* Skip spaces */
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do {
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c = tok_nextc(tok);
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} while (c == ' ' || c == '\t');
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/* Set start of current token */
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tok->start = tok->cur - 1;
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/* Skip comment */
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if (c == '#') {
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/* Hack to allow overriding the tabsize in the file.
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This is also recognized by vi, when it occurs near the
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beginning or end of the file. (Will vi never die...?)
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For Python it must be at the beginning of the file! */
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/* XXX The real vi syntax is actually different :-( */
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/* XXX Should recognize Emacs syntax, too */
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int x;
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if (sscanf(tok->cur,
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" vi:set tabsize=%d:", &x) == 1 &&
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x >= 1 && x <= 40) {
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/* fprintf(stderr, "# vi:set tabsize=%d:\n", x); */
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tok->tabsize = x;
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}
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do {
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c = tok_nextc(tok);
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} while (c != EOF && c != '\n');
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}
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/* Check for EOF and errors now */
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if (c == EOF) {
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return tok->done == E_EOF ? ENDMARKER : ERRORTOKEN;
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}
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/* Identifier (most frequent token!) */
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if (isalpha(c) || c == '_') {
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do {
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c = tok_nextc(tok);
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} while (isalnum(c) || c == '_');
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tok_backup(tok, c);
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*p_start = tok->start;
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*p_end = tok->cur;
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return NAME;
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}
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/* Newline */
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if (c == '\n') {
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tok->atbol = 1;
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if (blankline || tok->level > 0)
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goto nextline;
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*p_start = tok->start;
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*p_end = tok->cur - 1; /* Leave '\n' out of the string */
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return NEWLINE;
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}
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/* Period or number starting with period? */
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if (c == '.') {
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c = tok_nextc(tok);
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if (isdigit(c)) {
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goto fraction;
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}
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else {
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tok_backup(tok, c);
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*p_start = tok->start;
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*p_end = tok->cur;
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return DOT;
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}
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}
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/* Number */
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if (isdigit(c)) {
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if (c == '0') {
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/* Hex or octal */
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c = tok_nextc(tok);
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if (c == '.')
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goto fraction;
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if (c == 'x' || c == 'X') {
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/* Hex */
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do {
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c = tok_nextc(tok);
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} while (isxdigit(c));
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}
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else {
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/* XXX This is broken! E.g.,
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09.9 should be accepted as float! */
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/* Octal; c is first char of it */
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|
/* There's no 'isoctdigit' macro, sigh */
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|
while ('0' <= c && c < '8') {
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|
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);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
tok_backup(tok, c);
|
|
*p_start = tok->start;
|
|
*p_end = tok->cur;
|
|
return NUMBER;
|
|
}
|
|
|
|
/* String */
|
|
if (c == '\'' || c == '"') {
|
|
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+2) {
|
|
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 = tok_2char(c, c2);
|
|
if (token != OP) {
|
|
*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 tok_1char(c);
|
|
}
|
|
|
|
|
|
#ifdef DEBUG
|
|
|
|
void
|
|
tok_dump(type, start, end)
|
|
int type;
|
|
char *start, *end;
|
|
{
|
|
printf("%s", tok_name[type]);
|
|
if (type == NAME || type == NUMBER || type == STRING || type == OP)
|
|
printf("(%.*s)", (int)(end - start), start);
|
|
}
|
|
|
|
#endif
|