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550 lines
10 KiB
C
550 lines
10 KiB
C
/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Edward Wang at The University of California, Berkeley.
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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 the University of
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* California, Berkeley and its contributors.
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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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#ifndef lint
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static char sccsid[] = "@(#)scanner.c 8.1 (Berkeley) 6/6/93";
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#endif /* not lint */
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#include <ctype.h>
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#include "value.h"
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#include "token.h"
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#include "context.h"
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#include "string.h"
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s_getc()
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{
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register c;
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switch (cx.x_type) {
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case X_FILE:
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c = getc(cx.x_fp);
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if (cx.x_bol && c != EOF) {
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cx.x_bol = 0;
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cx.x_lineno++;
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}
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if (c == '\n')
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cx.x_bol = 1;
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return c;
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case X_BUF:
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if (*cx.x_bufp != 0)
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return *cx.x_bufp++ & 0xff;
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else
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return EOF;
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}
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/*NOTREACHED*/
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}
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s_ungetc(c)
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{
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if (c == EOF)
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return EOF;
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switch (cx.x_type) {
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case X_FILE:
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cx.x_bol = 0;
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return ungetc(c, cx.x_fp);
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case X_BUF:
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if (cx.x_bufp > cx.x_buf)
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return *--cx.x_bufp = c;
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else
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return EOF;
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}
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/*NOTREACHED*/
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}
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s_gettok()
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{
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char buf[100];
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register char *p = buf;
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register c;
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register state = 0;
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loop:
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c = s_getc();
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switch (state) {
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case 0:
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switch (c) {
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case ' ':
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case '\t':
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break;
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case '\n':
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case ';':
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cx.x_token = T_EOL;
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state = -1;
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break;
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case '#':
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state = 1;
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break;
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case EOF:
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cx.x_token = T_EOF;
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state = -1;
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break;
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case '"':
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state = 3;
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break;
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case '\'':
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state = 4;
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break;
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case '\\':
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switch (c = s_gettok1()) {
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case -1:
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break;
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case -2:
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state = 0;
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break;
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default:
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*p++ = c;
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state = 2;
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}
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break;
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case '0':
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cx.x_val.v_num = 0;
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state = 10;
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break;
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case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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cx.x_val.v_num = c - '0';
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state = 11;
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break;
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case '>':
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state = 20;
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break;
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case '<':
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state = 21;
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break;
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case '=':
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state = 22;
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break;
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case '!':
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state = 23;
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break;
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case '&':
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state = 24;
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break;
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case '|':
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state = 25;
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break;
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case '$':
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state = 26;
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break;
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case '~':
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cx.x_token = T_COMP;
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state = -1;
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break;
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case '+':
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cx.x_token = T_PLUS;
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state = -1;
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break;
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case '-':
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cx.x_token = T_MINUS;
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state = -1;
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break;
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case '*':
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cx.x_token = T_MUL;
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state = -1;
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break;
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case '/':
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cx.x_token = T_DIV;
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state = -1;
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break;
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case '%':
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cx.x_token = T_MOD;
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state = -1;
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break;
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case '^':
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cx.x_token = T_XOR;
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state = -1;
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break;
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case '(':
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cx.x_token = T_LP;
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state = -1;
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break;
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case ')':
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cx.x_token = T_RP;
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state = -1;
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break;
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case ',':
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cx.x_token = T_COMMA;
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state = -1;
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break;
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case '?':
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cx.x_token = T_QUEST;
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state = -1;
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break;
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case ':':
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cx.x_token = T_COLON;
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state = -1;
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break;
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case '[':
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cx.x_token = T_LB;
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state = -1;
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break;
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case ']':
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cx.x_token = T_RB;
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state = -1;
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break;
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default:
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if (isalpha(c) || c == '_' || c == '.') {
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*p++ = c;
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state = 2;
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break;
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}
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cx.x_val.v_num = c;
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cx.x_token = T_CHAR;
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state = -1;
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break;
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}
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break;
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case 1: /* got # */
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if (c == '\n' || c == EOF) {
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(void) s_ungetc(c);
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state = 0;
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}
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break;
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case 2: /* unquoted string */
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switch (c) {
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case '"':
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state = 3;
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break;
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case '\'':
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state = 4;
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break;
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case '\\':
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switch (c = s_gettok1()) {
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case -2:
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(void) s_ungetc(' ');
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case -1:
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break;
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default:
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if (p < buf + sizeof buf - 1)
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*p++ = c;
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}
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break;
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default:
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if (isalnum(c) || c == '_' || c == '.') {
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if (p < buf + sizeof buf - 1)
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*p++ = c;
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break;
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}
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(void) s_ungetc(c);
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case EOF:
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*p = 0;
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cx.x_token = T_STR;
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switch (*buf) {
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case 'i':
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if (buf[1] == 'f' && buf[2] == 0)
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cx.x_token = T_IF;
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break;
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case 't':
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if (buf[1] == 'h' && buf[2] == 'e'
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&& buf[3] == 'n' && buf[4] == 0)
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cx.x_token = T_THEN;
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break;
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case 'e':
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if (buf[1] == 'n' && buf[2] == 'd'
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&& buf[3] == 'i' && buf[4] == 'f'
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&& buf[5] == 0)
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cx.x_token = T_ENDIF;
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else if (buf[1] == 'l' && buf[2] == 's')
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if (buf[3] == 'i' && buf[4] == 'f'
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&& buf[5] == 0)
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cx.x_token = T_ELSIF;
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else if (buf[3] == 'e' && buf[4] == 0)
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cx.x_token = T_ELSE;
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break;
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}
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if (cx.x_token == T_STR
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&& (cx.x_val.v_str = str_cpy(buf)) == 0) {
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p_memerror();
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cx.x_token = T_EOF;
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}
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state = -1;
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break;
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}
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break;
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case 3: /* " quoted string */
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switch (c) {
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case '\n':
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(void) s_ungetc(c);
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case EOF:
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case '"':
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state = 2;
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break;
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case '\\':
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switch (c = s_gettok1()) {
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case -1:
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case -2: /* newlines are invisible */
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break;
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default:
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if (p < buf + sizeof buf - 1)
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*p++ = c;
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}
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break;
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default:
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if (p < buf + sizeof buf - 1)
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*p++ = c;
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break;
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}
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break;
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case 4: /* ' quoted string */
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switch (c) {
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case '\n':
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(void) s_ungetc(c);
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case EOF:
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case '\'':
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state = 2;
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break;
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case '\\':
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switch (c = s_gettok1()) {
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case -1:
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case -2: /* newlines are invisible */
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break;
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default:
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if (p < buf + sizeof buf - 1)
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*p++ = c;
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}
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break;
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default:
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if (p < buf + sizeof buf - 1)
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*p++ = c;
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break;
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}
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break;
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case 10: /* got 0 */
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switch (c) {
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case 'x':
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case 'X':
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cx.x_val.v_num = 0;
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state = 12;
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break;
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7':
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cx.x_val.v_num = c - '0';
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state = 13;
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break;
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case '8': case '9':
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cx.x_val.v_num = c - '0';
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state = 11;
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break;
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default:
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(void) s_ungetc(c);
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state = -1;
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cx.x_token = T_NUM;
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}
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break;
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case 11: /* decimal number */
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switch (c) {
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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cx.x_val.v_num = cx.x_val.v_num * 10 + c - '0';
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break;
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default:
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(void) s_ungetc(c);
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state = -1;
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cx.x_token = T_NUM;
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}
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break;
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case 12: /* hex number */
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switch (c) {
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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cx.x_val.v_num = cx.x_val.v_num * 16 + c - '0';
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break;
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case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
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cx.x_val.v_num = cx.x_val.v_num * 16 + c - 'a' + 10;
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break;
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case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
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cx.x_val.v_num = cx.x_val.v_num * 16 + c - 'A' + 10;
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break;
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default:
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(void) s_ungetc(c);
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state = -1;
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cx.x_token = T_NUM;
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}
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break;
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case 13: /* octal number */
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switch (c) {
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7':
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cx.x_val.v_num = cx.x_val.v_num * 8 + c - '0';
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break;
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default:
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(void) s_ungetc(c);
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state = -1;
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cx.x_token = T_NUM;
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}
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break;
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case 20: /* got > */
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switch (c) {
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case '=':
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cx.x_token = T_GE;
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state = -1;
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break;
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case '>':
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cx.x_token = T_RS;
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state = -1;
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break;
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default:
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(void) s_ungetc(c);
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cx.x_token = T_GT;
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state = -1;
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}
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break;
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case 21: /* got < */
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switch (c) {
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case '=':
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cx.x_token = T_LE;
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state = -1;
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break;
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case '<':
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cx.x_token = T_LS;
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state = -1;
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break;
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default:
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(void) s_ungetc(c);
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cx.x_token = T_LT;
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state = -1;
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}
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break;
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case 22: /* got = */
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switch (c) {
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case '=':
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cx.x_token = T_EQ;
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state = -1;
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break;
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default:
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(void) s_ungetc(c);
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cx.x_token = T_ASSIGN;
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state = -1;
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}
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break;
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case 23: /* got ! */
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switch (c) {
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case '=':
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cx.x_token = T_NE;
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state = -1;
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break;
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default:
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(void) s_ungetc(c);
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cx.x_token = T_NOT;
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state = -1;
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}
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break;
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case 24: /* got & */
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switch (c) {
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case '&':
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cx.x_token = T_ANDAND;
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state = -1;
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break;
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default:
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(void) s_ungetc(c);
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cx.x_token = T_AND;
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state = -1;
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}
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break;
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case 25: /* got | */
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switch (c) {
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case '|':
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cx.x_token = T_OROR;
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state = -1;
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break;
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default:
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(void) s_ungetc(c);
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cx.x_token = T_OR;
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state = -1;
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}
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break;
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case 26: /* got $ */
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switch (c) {
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case '?':
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cx.x_token = T_DQ;
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state = -1;
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break;
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default:
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(void) s_ungetc(c);
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cx.x_token = T_DOLLAR;
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state = -1;
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}
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break;
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default:
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abort();
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}
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if (state >= 0)
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goto loop;
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return cx.x_token;
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}
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s_gettok1()
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{
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register c;
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register n;
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c = s_getc(); /* got \ */
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switch (c) {
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case EOF:
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return -1;
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case '\n':
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return -2;
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case 'b':
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return '\b';
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case 'f':
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return '\f';
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case 'n':
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return '\n';
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case 'r':
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return '\r';
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case 't':
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return '\t';
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default:
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return c;
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7':
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break;
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}
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n = c - '0';
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c = s_getc(); /* got \[0-7] */
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if (c < '0' || c > '7') {
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(void) s_ungetc(c);
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return n;
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}
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n = n * 8 + c - '0';
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c = s_getc(); /* got \[0-7][0-7] */
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if (c < '0' || c > '7') {
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(void) s_ungetc(c);
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return n;
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}
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return n * 8 + c - '0';
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}
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