573 lines
11 KiB
C
573 lines
11 KiB
C
/*
|
|
* Copyright (c) 1983, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* Edward Wang at The University of California, Berkeley.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef lint
|
|
static char sccsid[] = "@(#)scanner.c 8.1 (Berkeley) 6/6/93";
|
|
#endif /* not lint */
|
|
|
|
#include "value.h"
|
|
#include "token.h"
|
|
#include "context.h"
|
|
#include "string.h"
|
|
|
|
s_getc()
|
|
{
|
|
register c;
|
|
|
|
switch (cx.x_type) {
|
|
case X_FILE:
|
|
c = getc(cx.x_fp);
|
|
if (cx.x_bol && c != EOF) {
|
|
cx.x_bol = 0;
|
|
cx.x_lineno++;
|
|
}
|
|
if (c == '\n')
|
|
cx.x_bol = 1;
|
|
return c;
|
|
case X_BUF:
|
|
if (*cx.x_bufp != 0)
|
|
return *cx.x_bufp++ & 0xff;
|
|
else
|
|
return EOF;
|
|
}
|
|
/*NOTREACHED*/
|
|
}
|
|
|
|
s_ungetc(c)
|
|
{
|
|
if (c == EOF)
|
|
return EOF;
|
|
switch (cx.x_type) {
|
|
case X_FILE:
|
|
cx.x_bol = 0;
|
|
return ungetc(c, cx.x_fp);
|
|
case X_BUF:
|
|
if (cx.x_bufp > cx.x_buf)
|
|
return *--cx.x_bufp = c;
|
|
else
|
|
return EOF;
|
|
}
|
|
/*NOTREACHED*/
|
|
}
|
|
|
|
s_gettok()
|
|
{
|
|
char buf[100];
|
|
register char *p = buf;
|
|
register c;
|
|
register state = 0;
|
|
|
|
loop:
|
|
c = s_getc();
|
|
switch (state) {
|
|
case 0:
|
|
switch (c) {
|
|
case ' ':
|
|
case '\t':
|
|
break;
|
|
case '\n':
|
|
case ';':
|
|
cx.x_token = T_EOL;
|
|
state = -1;
|
|
break;
|
|
case '#':
|
|
state = 1;
|
|
break;
|
|
case EOF:
|
|
cx.x_token = T_EOF;
|
|
state = -1;
|
|
break;
|
|
case 'a': case 'b': case 'c': case 'd': case 'e':
|
|
case 'f': case 'g': case 'h': case 'i': case 'j':
|
|
case 'k': case 'l': case 'm': case 'n': case 'o':
|
|
case 'p': case 'q': case 'r': case 's': case 't':
|
|
case 'u': case 'v': case 'w': case 'x': case 'y':
|
|
case 'z':
|
|
case 'A': case 'B': case 'C': case 'D': case 'E':
|
|
case 'F': case 'G': case 'H': case 'I': case 'J':
|
|
case 'K': case 'L': case 'M': case 'N': case 'O':
|
|
case 'P': case 'Q': case 'R': case 'S': case 'T':
|
|
case 'U': case 'V': case 'W': case 'X': case 'Y':
|
|
case 'Z':
|
|
case '_': case '.':
|
|
*p++ = c;
|
|
state = 2;
|
|
break;
|
|
case '"':
|
|
state = 3;
|
|
break;
|
|
case '\'':
|
|
state = 4;
|
|
break;
|
|
case '\\':
|
|
switch (c = s_gettok1()) {
|
|
case -1:
|
|
break;
|
|
case -2:
|
|
state = 0;
|
|
break;
|
|
default:
|
|
*p++ = c;
|
|
state = 2;
|
|
}
|
|
break;
|
|
case '0':
|
|
cx.x_val.v_num = 0;
|
|
state = 10;
|
|
break;
|
|
case '1': case '2': case '3': case '4':
|
|
case '5': case '6': case '7': case '8': case '9':
|
|
cx.x_val.v_num = c - '0';
|
|
state = 11;
|
|
break;
|
|
case '>':
|
|
state = 20;
|
|
break;
|
|
case '<':
|
|
state = 21;
|
|
break;
|
|
case '=':
|
|
state = 22;
|
|
break;
|
|
case '!':
|
|
state = 23;
|
|
break;
|
|
case '&':
|
|
state = 24;
|
|
break;
|
|
case '|':
|
|
state = 25;
|
|
break;
|
|
case '$':
|
|
state = 26;
|
|
break;
|
|
case '~':
|
|
cx.x_token = T_COMP;
|
|
state = -1;
|
|
break;
|
|
case '+':
|
|
cx.x_token = T_PLUS;
|
|
state = -1;
|
|
break;
|
|
case '-':
|
|
cx.x_token = T_MINUS;
|
|
state = -1;
|
|
break;
|
|
case '*':
|
|
cx.x_token = T_MUL;
|
|
state = -1;
|
|
break;
|
|
case '/':
|
|
cx.x_token = T_DIV;
|
|
state = -1;
|
|
break;
|
|
case '%':
|
|
cx.x_token = T_MOD;
|
|
state = -1;
|
|
break;
|
|
case '^':
|
|
cx.x_token = T_XOR;
|
|
state = -1;
|
|
break;
|
|
case '(':
|
|
cx.x_token = T_LP;
|
|
state = -1;
|
|
break;
|
|
case ')':
|
|
cx.x_token = T_RP;
|
|
state = -1;
|
|
break;
|
|
case ',':
|
|
cx.x_token = T_COMMA;
|
|
state = -1;
|
|
break;
|
|
case '?':
|
|
cx.x_token = T_QUEST;
|
|
state = -1;
|
|
break;
|
|
case ':':
|
|
cx.x_token = T_COLON;
|
|
state = -1;
|
|
break;
|
|
case '[':
|
|
cx.x_token = T_LB;
|
|
state = -1;
|
|
break;
|
|
case ']':
|
|
cx.x_token = T_RB;
|
|
state = -1;
|
|
break;
|
|
default:
|
|
cx.x_val.v_num = c;
|
|
cx.x_token = T_CHAR;
|
|
state = -1;
|
|
break;
|
|
}
|
|
break;
|
|
case 1: /* got # */
|
|
if (c == '\n' || c == EOF) {
|
|
(void) s_ungetc(c);
|
|
state = 0;
|
|
}
|
|
break;
|
|
case 2: /* unquoted string */
|
|
switch (c) {
|
|
case 'a': case 'b': case 'c': case 'd': case 'e':
|
|
case 'f': case 'g': case 'h': case 'i': case 'j':
|
|
case 'k': case 'l': case 'm': case 'n': case 'o':
|
|
case 'p': case 'q': case 'r': case 's': case 't':
|
|
case 'u': case 'v': case 'w': case 'x': case 'y':
|
|
case 'z':
|
|
case 'A': case 'B': case 'C': case 'D': case 'E':
|
|
case 'F': case 'G': case 'H': case 'I': case 'J':
|
|
case 'K': case 'L': case 'M': case 'N': case 'O':
|
|
case 'P': case 'Q': case 'R': case 'S': case 'T':
|
|
case 'U': case 'V': case 'W': case 'X': case 'Y':
|
|
case 'Z':
|
|
case '_': case '.':
|
|
case '0': case '1': case '2': case '3': case '4':
|
|
case '5': case '6': case '7': case '8': case '9':
|
|
if (p < buf + sizeof buf - 1)
|
|
*p++ = c;
|
|
break;
|
|
case '"':
|
|
state = 3;
|
|
break;
|
|
case '\'':
|
|
state = 4;
|
|
break;
|
|
case '\\':
|
|
switch (c = s_gettok1()) {
|
|
case -2:
|
|
(void) s_ungetc(' ');
|
|
case -1:
|
|
break;
|
|
default:
|
|
if (p < buf + sizeof buf - 1)
|
|
*p++ = c;
|
|
}
|
|
break;
|
|
default:
|
|
(void) s_ungetc(c);
|
|
case EOF:
|
|
*p = 0;
|
|
cx.x_token = T_STR;
|
|
switch (*buf) {
|
|
case 'i':
|
|
if (buf[1] == 'f' && buf[2] == 0)
|
|
cx.x_token = T_IF;
|
|
break;
|
|
case 't':
|
|
if (buf[1] == 'h' && buf[2] == 'e'
|
|
&& buf[3] == 'n' && buf[4] == 0)
|
|
cx.x_token = T_THEN;
|
|
break;
|
|
case 'e':
|
|
if (buf[1] == 'n' && buf[2] == 'd'
|
|
&& buf[3] == 'i' && buf[4] == 'f'
|
|
&& buf[5] == 0)
|
|
cx.x_token = T_ENDIF;
|
|
else if (buf[1] == 'l' && buf[2] == 's')
|
|
if (buf[3] == 'i' && buf[4] == 'f'
|
|
&& buf[5] == 0)
|
|
cx.x_token = T_ELSIF;
|
|
else if (buf[3] == 'e' && buf[4] == 0)
|
|
cx.x_token = T_ELSE;
|
|
break;
|
|
}
|
|
if (cx.x_token == T_STR
|
|
&& (cx.x_val.v_str = str_cpy(buf)) == 0) {
|
|
p_memerror();
|
|
cx.x_token = T_EOF;
|
|
}
|
|
state = -1;
|
|
break;
|
|
}
|
|
break;
|
|
case 3: /* " quoted string */
|
|
switch (c) {
|
|
case '\n':
|
|
(void) s_ungetc(c);
|
|
case EOF:
|
|
case '"':
|
|
state = 2;
|
|
break;
|
|
case '\\':
|
|
switch (c = s_gettok1()) {
|
|
case -1:
|
|
case -2: /* newlines are invisible */
|
|
break;
|
|
default:
|
|
if (p < buf + sizeof buf - 1)
|
|
*p++ = c;
|
|
}
|
|
break;
|
|
default:
|
|
if (p < buf + sizeof buf - 1)
|
|
*p++ = c;
|
|
break;
|
|
}
|
|
break;
|
|
case 4: /* ' quoted string */
|
|
switch (c) {
|
|
case '\n':
|
|
(void) s_ungetc(c);
|
|
case EOF:
|
|
case '\'':
|
|
state = 2;
|
|
break;
|
|
case '\\':
|
|
switch (c = s_gettok1()) {
|
|
case -1:
|
|
case -2: /* newlines are invisible */
|
|
break;
|
|
default:
|
|
if (p < buf + sizeof buf - 1)
|
|
*p++ = c;
|
|
}
|
|
break;
|
|
default:
|
|
if (p < buf + sizeof buf - 1)
|
|
*p++ = c;
|
|
break;
|
|
}
|
|
break;
|
|
case 10: /* got 0 */
|
|
switch (c) {
|
|
case 'x':
|
|
case 'X':
|
|
cx.x_val.v_num = 0;
|
|
state = 12;
|
|
break;
|
|
case '0': case '1': case '2': case '3': case '4':
|
|
case '5': case '6': case '7':
|
|
cx.x_val.v_num = c - '0';
|
|
state = 13;
|
|
break;
|
|
case '8': case '9':
|
|
cx.x_val.v_num = c - '0';
|
|
state = 11;
|
|
break;
|
|
default:
|
|
(void) s_ungetc(c);
|
|
state = -1;
|
|
cx.x_token = T_NUM;
|
|
}
|
|
break;
|
|
case 11: /* decimal number */
|
|
switch (c) {
|
|
case '0': case '1': case '2': case '3': case '4':
|
|
case '5': case '6': case '7': case '8': case '9':
|
|
cx.x_val.v_num = cx.x_val.v_num * 10 + c - '0';
|
|
break;
|
|
default:
|
|
(void) s_ungetc(c);
|
|
state = -1;
|
|
cx.x_token = T_NUM;
|
|
}
|
|
break;
|
|
case 12: /* hex number */
|
|
switch (c) {
|
|
case '0': case '1': case '2': case '3': case '4':
|
|
case '5': case '6': case '7': case '8': case '9':
|
|
cx.x_val.v_num = cx.x_val.v_num * 16 + c - '0';
|
|
break;
|
|
case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
|
|
cx.x_val.v_num = cx.x_val.v_num * 16 + c - 'a' + 10;
|
|
break;
|
|
case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
|
|
cx.x_val.v_num = cx.x_val.v_num * 16 + c - 'A' + 10;
|
|
break;
|
|
default:
|
|
(void) s_ungetc(c);
|
|
state = -1;
|
|
cx.x_token = T_NUM;
|
|
}
|
|
break;
|
|
case 13: /* octal number */
|
|
switch (c) {
|
|
case '0': case '1': case '2': case '3': case '4':
|
|
case '5': case '6': case '7':
|
|
cx.x_val.v_num = cx.x_val.v_num * 8 + c - '0';
|
|
break;
|
|
default:
|
|
(void) s_ungetc(c);
|
|
state = -1;
|
|
cx.x_token = T_NUM;
|
|
}
|
|
break;
|
|
case 20: /* got > */
|
|
switch (c) {
|
|
case '=':
|
|
cx.x_token = T_GE;
|
|
state = -1;
|
|
break;
|
|
case '>':
|
|
cx.x_token = T_RS;
|
|
state = -1;
|
|
break;
|
|
default:
|
|
(void) s_ungetc(c);
|
|
cx.x_token = T_GT;
|
|
state = -1;
|
|
}
|
|
break;
|
|
case 21: /* got < */
|
|
switch (c) {
|
|
case '=':
|
|
cx.x_token = T_LE;
|
|
state = -1;
|
|
break;
|
|
case '<':
|
|
cx.x_token = T_LS;
|
|
state = -1;
|
|
break;
|
|
default:
|
|
(void) s_ungetc(c);
|
|
cx.x_token = T_LT;
|
|
state = -1;
|
|
}
|
|
break;
|
|
case 22: /* got = */
|
|
switch (c) {
|
|
case '=':
|
|
cx.x_token = T_EQ;
|
|
state = -1;
|
|
break;
|
|
default:
|
|
(void) s_ungetc(c);
|
|
cx.x_token = T_ASSIGN;
|
|
state = -1;
|
|
}
|
|
break;
|
|
case 23: /* got ! */
|
|
switch (c) {
|
|
case '=':
|
|
cx.x_token = T_NE;
|
|
state = -1;
|
|
break;
|
|
default:
|
|
(void) s_ungetc(c);
|
|
cx.x_token = T_NOT;
|
|
state = -1;
|
|
}
|
|
break;
|
|
case 24: /* got & */
|
|
switch (c) {
|
|
case '&':
|
|
cx.x_token = T_ANDAND;
|
|
state = -1;
|
|
break;
|
|
default:
|
|
(void) s_ungetc(c);
|
|
cx.x_token = T_AND;
|
|
state = -1;
|
|
}
|
|
break;
|
|
case 25: /* got | */
|
|
switch (c) {
|
|
case '|':
|
|
cx.x_token = T_OROR;
|
|
state = -1;
|
|
break;
|
|
default:
|
|
(void) s_ungetc(c);
|
|
cx.x_token = T_OR;
|
|
state = -1;
|
|
}
|
|
break;
|
|
case 26: /* got $ */
|
|
switch (c) {
|
|
case '?':
|
|
cx.x_token = T_DQ;
|
|
state = -1;
|
|
break;
|
|
default:
|
|
(void) s_ungetc(c);
|
|
cx.x_token = T_DOLLAR;
|
|
state = -1;
|
|
}
|
|
break;
|
|
default:
|
|
abort();
|
|
}
|
|
if (state >= 0)
|
|
goto loop;
|
|
return cx.x_token;
|
|
}
|
|
|
|
s_gettok1()
|
|
{
|
|
register c;
|
|
register n;
|
|
|
|
c = s_getc(); /* got \ */
|
|
switch (c) {
|
|
case EOF:
|
|
return -1;
|
|
case '\n':
|
|
return -2;
|
|
case 'b':
|
|
return '\b';
|
|
case 'f':
|
|
return '\f';
|
|
case 'n':
|
|
return '\n';
|
|
case 'r':
|
|
return '\r';
|
|
case 't':
|
|
return '\t';
|
|
default:
|
|
return c;
|
|
case '0': case '1': case '2': case '3': case '4':
|
|
case '5': case '6': case '7':
|
|
break;
|
|
}
|
|
n = c - '0';
|
|
c = s_getc(); /* got \[0-7] */
|
|
if (c < '0' || c > '7') {
|
|
(void) s_ungetc(c);
|
|
return n;
|
|
}
|
|
n = n * 8 + c - '0';
|
|
c = s_getc(); /* got \[0-7][0-7] */
|
|
if (c < '0' || c > '7') {
|
|
(void) s_ungetc(c);
|
|
return n;
|
|
}
|
|
return n * 8 + c - '0';
|
|
}
|