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15f6504832
freebsd/games/atc/grammar.y
Bruce Evans e81c798e2b Fixed the type of yyerror() (1970's style).
1998-06-30 18:31:17 +00:00

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/*-
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Ed James.
*
* 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.
*/
/*
* Copyright (c) 1987 by Ed James, UC Berkeley. All rights reserved.
*
* Copy permission is hereby granted provided that this notice is
* retained on all partial or complete copies.
*
* For more info on this and all of my stuff, mail edjames@berkeley.edu.
*/
%token <ival> HeightOp
%token <ival> WidthOp
%token <ival> UpdateOp
%token <ival> NewplaneOp
%token <cval> DirOp
%token <ival> ConstOp
%token <ival> LineOp
%token <ival> AirportOp
%token <ival> BeaconOp
%token <ival> ExitOp
%union {
int ival;
char cval;
}
%{
#include "include.h"
#ifndef lint
static char sccsid[] = "@(#)grammar.y 8.1 (Berkeley) 5/31/93";
#endif /* not lint */
int errors = 0;
int line = 1;
%}
%%
file:
bunch_of_defs { if (checkdefs() < 0) return (errors); } bunch_of_lines
{
if (sp->num_exits + sp->num_airports < 2)
yyerror("Need at least 2 airports and/or exits.");
return (errors);
}
;
bunch_of_defs:
def bunch_of_defs
| def
;
def:
udef
| ndef
| wdef
| hdef
;
udef:
UpdateOp '=' ConstOp ';'
{
if (sp->update_secs != 0)
return (yyerror("Redefinition of 'update'."));
else if ($3 < 1)
return (yyerror("'update' is too small."));
else
sp->update_secs = $3;
}
;
ndef:
NewplaneOp '=' ConstOp ';'
{
if (sp->newplane_time != 0)
return (yyerror("Redefinition of 'newplane'."));
else if ($3 < 1)
return (yyerror("'newplane' is too small."));
else
sp->newplane_time = $3;
}
;
hdef:
HeightOp '=' ConstOp ';'
{
if (sp->height != 0)
return (yyerror("Redefinition of 'height'."));
else if ($3 < 3)
return (yyerror("'height' is too small."));
else
sp->height = $3;
}
;
wdef:
WidthOp '=' ConstOp ';'
{
if (sp->height != 0)
return (yyerror("Redefinition of 'width'."));
else if ($3 < 3)
return (yyerror("'width' is too small."));
else
sp->width = $3;
}
;
bunch_of_lines:
line bunch_of_lines
{}
| line
{}
;
line:
BeaconOp ':' Bpoint_list ';'
{}
| ExitOp ':' Epoint_list ';'
{}
| LineOp ':' Lline_list ';'
{}
| AirportOp ':' Apoint_list ';'
{}
;
Bpoint_list:
Bpoint Bpoint_list
{}
| Bpoint
{}
;
Bpoint:
'(' ConstOp ConstOp ')'
{
if (sp->num_beacons % REALLOC == 0) {
if (sp->beacon == NULL)
sp->beacon = (BEACON *) malloc((sp->num_beacons
+ REALLOC) * sizeof (BEACON));
else
sp->beacon = (BEACON *) realloc(sp->beacon,
(sp->num_beacons + REALLOC) *
sizeof (BEACON));
if (sp->beacon == NULL)
return (yyerror("No memory available."));
}
sp->beacon[sp->num_beacons].x = $2;
sp->beacon[sp->num_beacons].y = $3;
check_point($2, $3);
sp->num_beacons++;
}
;
Epoint_list:
Epoint Epoint_list
{}
| Epoint
{}
;
Epoint:
'(' ConstOp ConstOp DirOp ')'
{
int dir;
if (sp->num_exits % REALLOC == 0) {
if (sp->exit == NULL)
sp->exit = (EXIT *) malloc((sp->num_exits +
REALLOC) * sizeof (EXIT));
else
sp->exit = (EXIT *) realloc(sp->exit,
(sp->num_exits + REALLOC) *
sizeof (EXIT));
if (sp->exit == NULL)
return (yyerror("No memory available."));
}
dir = dir_no($4);
sp->exit[sp->num_exits].x = $2;
sp->exit[sp->num_exits].y = $3;
sp->exit[sp->num_exits].dir = dir;
check_edge($2, $3);
check_edir($2, $3, dir);
sp->num_exits++;
}
;
Apoint_list:
Apoint Apoint_list
{}
| Apoint
{}
;
Apoint:
'(' ConstOp ConstOp DirOp ')'
{
int dir;
if (sp->num_airports % REALLOC == 0) {
if (sp->airport == NULL)
sp->airport=(AIRPORT *)malloc((sp->num_airports
+ REALLOC) * sizeof(AIRPORT));
else
sp->airport = (AIRPORT *) realloc(sp->airport,
(sp->num_airports + REALLOC) *
sizeof(AIRPORT));
if (sp->airport == NULL)
return (yyerror("No memory available."));
}
dir = dir_no($4);
sp->airport[sp->num_airports].x = $2;
sp->airport[sp->num_airports].y = $3;
sp->airport[sp->num_airports].dir = dir;
check_point($2, $3);
check_adir($2, $3, dir);
sp->num_airports++;
}
;
Lline_list:
Lline Lline_list
{}
| Lline
{}
;
Lline:
'[' '(' ConstOp ConstOp ')' '(' ConstOp ConstOp ')' ']'
{
if (sp->num_lines % REALLOC == 0) {
if (sp->line == NULL)
sp->line = (LINE *) malloc((sp->num_lines +
REALLOC) * sizeof (LINE));
else
sp->line = (LINE *) realloc(sp->line,
(sp->num_lines + REALLOC) *
sizeof (LINE));
if (sp->line == NULL)
return (yyerror("No memory available."));
}
sp->line[sp->num_lines].p1.x = $3;
sp->line[sp->num_lines].p1.y = $4;
sp->line[sp->num_lines].p2.x = $7;
sp->line[sp->num_lines].p2.y = $8;
check_line($3, $4, $7, $8);
sp->num_lines++;
}
;
%%
check_edge(x, y)
{
if (!(x == 0) && !(x == sp->width - 1) &&
!(y == 0) && !(y == sp->height - 1))
yyerror("edge value not on edge.");
}
check_point(x, y)
{
if (x < 1 || x >= sp->width - 1)
yyerror("X value out of range.");
if (y < 1 || y >= sp->height - 1)
yyerror("Y value out of range.");
}
check_linepoint(x, y)
{
if (x < 0 || x >= sp->width)
yyerror("X value out of range.");
if (y < 0 || y >= sp->height)
yyerror("Y value out of range.");
}
check_line(x1, y1, x2, y2)
{
int d1, d2;
check_linepoint(x1, y1);
check_linepoint(x2, y2);
d1 = ABS(x2 - x1);
d2 = ABS(y2 - y1);
if (!(d1 == d2) && !(d1 == 0) && !(d2 == 0))
yyerror("Bad line endpoints.");
}
yyerror(s)
char *s;
{
fprintf(stderr, "\"%s\": line %d: %s\n", file, line, s);
errors++;
return (errors);
}
check_edir(x, y, dir)
{
int bad = 0;
if (x == sp->width - 1)
x = 2;
else if (x != 0)
x = 1;
if (y == sp->height - 1)
y = 2;
else if (y != 0)
y = 1;
switch (x * 10 + y) {
case 00: if (dir != 3) bad++; break;
case 01: if (dir < 1 || dir > 3) bad++; break;
case 02: if (dir != 1) bad++; break;
case 10: if (dir < 3 || dir > 5) bad++; break;
case 11: break;
case 12: if (dir > 1 && dir < 7) bad++; break;
case 20: if (dir != 5) bad++; break;
case 21: if (dir < 5) bad++; break;
case 22: if (dir != 7) bad++; break;
default:
yyerror("Unknown value in checkdir! Get help!");
break;
}
if (bad)
yyerror("Bad direction for entrance at exit.");
}
check_adir(x, y, dir)
{
}
checkdefs()
{
int err = 0;
if (sp->width == 0) {
yyerror("'width' undefined.");
err++;
}
if (sp->height == 0) {
yyerror("'height' undefined.");
err++;
}
if (sp->update_secs == 0) {
yyerror("'update' undefined.");
err++;
}
if (sp->newplane_time == 0) {
yyerror("'newplane' undefined.");
err++;
}
if (err)
return (-1);
else
return (0);
}
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