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294 lines
6.8 KiB
C
294 lines
6.8 KiB
C
/*
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* Copyright (c) 1998 Shigio Yamaguchi. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Shigio Yamaguchi.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* token.c 14-Aug-98
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*/
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#include <ctype.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/param.h>
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#include "mgets.h"
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#include "token.h"
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/*
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* File input method.
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*/
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int lineno;
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char *sp, *cp, *lp;
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int crflag; /* 1: return '\n', 0: doesn't return */
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int cmode; /* allow token which start with '#' */
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int ymode; /* allow token which start with '%' */
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char token[MAXTOKEN];
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char curfile[MAXPATHLEN];
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static char ptok[MAXTOKEN];
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static int lasttok;
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static FILE *ip;
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static void pushbackchar __P((void));
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/*
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* opentoken:
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*/
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int
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opentoken(file)
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char *file;
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{
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if ((ip = fopen(file, "r")) == NULL)
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return 0;
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strcpy(curfile, file);
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sp = cp = lp = NULL; lineno = 0;
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return 1;
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}
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/*
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* closetoken:
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*/
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void
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closetoken()
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{
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fclose(ip);
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}
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/*
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* nexttoken: get next token
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*
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* i) interested interested special charactor
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* if NULL then all charactor.
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* i) reserved converter from token to token number
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* if this is specified, nexttoken() return
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* word number, else return symbol.
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* r) EOF(-1) end of file
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* ==0 symbol ('tok' has the value.)
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* > 255 reserved word
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* <=255 interested special charactor
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*
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* nexttoken() doesn't return followings.
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*
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* o comment
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* o space (' ', '\t', '\f')
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* o quoted string ("...", '.')
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*/
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int
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nexttoken(interested, reserved)
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const char *interested;
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int (*reserved)(char *);
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{
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int c;
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char *p;
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int sharp = 0;
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int percent = 0;
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/* check push back buffer */
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if (ptok[0]) {
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strcpy(token, ptok);
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ptok[0] = 0;
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return lasttok;
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}
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for (;;) {
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/* skip spaces */
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if (!crflag)
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while ((c = nextchar()) != EOF && isspace(c))
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;
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else
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while ((c = nextchar()) != EOF && (c == ' ' || c == '\t' || c == '\f'))
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;
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if (c == EOF || c == '\n')
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break;
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if (c == '"' || c == '\'') { /* quoted string */
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int quote = c;
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while ((c = nextchar()) != EOF) {
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if (c == quote)
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break;
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if (quote == '\'' && c == '\n')
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break;
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if (c == '\\' && (c = nextchar()) == EOF)
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break;
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}
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} else if (c == '/') { /* comment */
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if ((c = nextchar()) == '/') {
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while ((c = nextchar()) != EOF)
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if (c == '\n')
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break;
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} else if (c == '*') {
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while ((c = nextchar()) != EOF) {
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if (c == '*') {
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if ((c = nextchar()) == '/')
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break;
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pushbackchar();
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}
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}
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} else
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pushbackchar();
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} else if (c == '\\') {
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(void)nextchar();
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} else if (isdigit(c)) { /* digit */
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while ((c = nextchar()) != EOF && (c == '.' || isdigit(c) || isalpha(c)))
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;
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pushbackchar();
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} else if (c == '#' && cmode) {
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/* recognize '##' as a token if it is reserved word. */
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if (peekc(1) == '#') {
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p = token;
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*p++ = c;
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*p++ = nextchar();
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*p = 0;
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if (reserved && (c = (*reserved)(token)) == 0)
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break;
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} else if (atfirst_exceptspace()) {
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sharp = 1;
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continue;
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}
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} else if (c == '%' && ymode) {
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/* recognize '%%' as a token if it is reserved word. */
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if (atfirst) {
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p = token;
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*p++ = c;
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if ((c = peekc(1)) == '%' || c == '{' || c == '}') {
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*p++ = nextchar();
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*p = 0;
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if (reserved && (c = (*reserved)(token)) != 0)
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break;
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} else if (!isspace(c)) {
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percent = 1;
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continue;
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}
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}
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} else if (c & 0x80 || isalpha(c) || c == '_') {/* symbol */
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p = token;
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if (sharp) {
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sharp = 0;
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*p++ = '#';
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} else if (percent) {
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percent = 0;
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*p++ = '%';
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}
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for (*p++ = c; (c = nextchar()) != EOF && (c & 0x80 || isalnum(c) || c == '_'); *p++ = c)
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;
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*p = 0;
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if (c != EOF)
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pushbackchar();
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/* convert token string into token number */
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if (reserved)
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c = (*reserved)(token);
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break;
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} else { /* special char */
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if (interested == NULL || strchr(interested, c))
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break;
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/* otherwise ignore it */
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}
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sharp = percent = 0;
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}
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return lasttok = c;
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}
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/*
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* pushbacktoken: push back token
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*
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* following nexttoken() return same token again.
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*/
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void
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pushbacktoken()
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{
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strcpy(ptok, token);
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}
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/*
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* peekc: peek next char
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*
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* i) immediate 0: ignore blank, 1: include blank
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*
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* Peekc() read ahead following blanks but doesn't chage line.
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*/
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int
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peekc(immediate)
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int immediate;
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{
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int c;
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long pos;
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if (cp != NULL) {
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if (immediate)
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c = nextchar();
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else
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while ((c = nextchar()) != EOF && c != '\n' && isspace(c))
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;
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if (c != EOF)
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pushbackchar();
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if (c != '\n' || immediate)
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return c;
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}
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pos = ftell(ip);
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if (immediate)
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c = getc(ip);
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else
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while ((c = getc(ip)) != EOF && isspace(c))
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;
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(void)fseek(ip, pos, SEEK_SET);
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return c;
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}
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/*
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* atfirst_exceptspace: return if current position is the first column
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* except for space.
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* | 1 0
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* | v v
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* | # define
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*/
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int
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atfirst_exceptspace()
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{
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char *start = sp;
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char *end = cp ? cp - 1 : lp;
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while (start < end && *start && isspace(*start))
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start++;
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return (start == end) ? 1 : 0;
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}
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/*
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* pushbackchar: push back charactor.
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*
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* following nextchar() return same charactor again.
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*
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*/
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static void
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pushbackchar()
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{
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if (sp == NULL)
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return; /* nothing to do */
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if (cp == NULL)
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cp = lp;
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else
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--cp;
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}
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