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/*
* Simple X11 edit-and-go frontend for the NASE A60 interpreter.
* Copyright (C) 1991-1996 Erik Schoenfelder (schoenfr@ibr.cs.tu-bs.de)
*
* This file is part of NASE A60.
*
* NASE A60 is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* NASE A60 is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with NASE A60; see the file COPYING. If not, write to the Free
* Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*
* xa60.c: may 1991
*
* first steps to a simple X frontend for edit and go fun.
* (nothing serious - be warned)
*/
#include <stdio.h>
#ifdef USG
#ifndef SYSV
/* commonly expected by X11R4: */
#define SYSV
#endif /* ! SYSV */
#endif /* USG */
#include <X11/Intrinsic.h>
#include <X11/StringDefs.h>
#include <X11/Xaw/Cardinals.h>
#include <X11/Xaw/AsciiText.h>
#include <X11/Xaw/Command.h>
#include <X11/Xaw/Paned.h>
#include <X11/Xaw/Box.h>
#define VERSION "xa60 v0.12, March 1996"
#define A60PATH "a60"
#define A60FLAGS "-X"
/*
* define as 1 to include a save button; this is not necessary,
* because the text is saved before every execution. (and upon exit)
*/
#define SAVE_BUTTEN 0
static String fallback_resources [] = {
"*input: True",
"*showGrip: on",
"*paned.width: 560",
"*etext*height: 360",
"*etext*editType: edit",
"*etext*scrollVertical: whenNeeded",
"*etext*autoFill: on",
"*otext*height: 240",
"*otext*editType: append",
"*otext*scrollVertical: whenNeeded",
"*otext*wrap: line",
"*otext*displayCaret: False",
"*bexit*label: Exit",
"*bexit*shapeStyle: oval",
"*bexit*borderWidth: 2",
"*clear*label: Clear",
"*clear*shapeStyle: oval",
#if SAVE_BUTTEN
"*save*label: Save",
"*save*shapeStyle: oval",
#endif
"*go*label: Go",
"*go*shapeStyle: oval",
"*fnlab*borderWidth: 0",
NULL,
};
/* selected input file: */
static char *fname = (char *) 0;
/* temporary textbuffer (and its length): */
static char *txt_buf = (char *) 0;
static int txt_max = 0;
static int txt_len;
/* global ... */
static Widget etext, otext;
/* forward: */
static void have_a_run ();
/*
* create a temporary file; a simple name is enough.
* static storage is ok.
*/
static char *
mk_fname ()
{
static char tmp [128];
sprintf (tmp, "/tmp/nase-%d", getpid ());
return tmp;
}
static void
read_file ()
{
FILE *fp;
int ch;
fp = fopen (fname, "r");
if (! fp) {
fp = fopen (fname, "w");
if (! fp) {
fprintf (stderr, "cannot open `%s' for writing...\n",
fname);
exit (1);
}
/*
* insert some default text:
*/
fprintf (fp, "begin\n vprint (\"Hi!\")\nend\n");
fclose (fp);
fp = fopen (fname, "r");
}
if (! fp) {
fprintf (stderr, "cannot open `%s' for reading...\n",
fname);
exit (1);
}
txt_len = 0;
do {
if (txt_len + 10 > txt_max) {
txt_max += 1000;
if (! txt_buf)
txt_buf = XtMalloc (txt_max);
else
txt_buf = XtRealloc (txt_buf, txt_max);
}
ch = fgetc (fp);
if (ch != EOF)
txt_buf [txt_len++] = ch;
} while (ch != EOF);
txt_buf [txt_len] = 0;
fclose (fp);
}
static void
append_text (w, str)
Widget w;
char *str;
{
XawTextBlock tb;
int rc, point;
tb.firstPos = 0;
tb.length = strlen (str);
tb.ptr = str;
tb.format = FMT8BIT;
point = XawTextGetInsertionPoint (w);
rc = XawTextReplace (w, point, point, &tb);
XawTextSetInsertionPoint (w, point + strlen (str));
if (rc == XawPositionError)
printf ("** xa60 internal error: XawPositionError ...\n");
else if (rc == XawEditError)
printf ("** xa60 internal error: XawEditError ...\n");
}
static void
set_caret (lno)
int lno;
{
Arg args[1];
String str;
int i, n;
XtSetArg(args[0], XtNstring, &str);
XtGetValues(etext, args, ONE);
/* look for character position of line lno : */
for (n = 0, i = 1; str [n] && i < lno; n++)
i += str [n] == '\n';
XawTextSetInsertionPoint (etext, n);
}
/*
* saving the text means: print the string (which contains the
* complete text).
* If this fails - abort.
*/
static void
save_file (txt)
char *txt;
{
FILE *fp;
fp = fopen (fname, "w");
if (! fp) {
fprintf (stderr, "cannot open `%s' for writing...\n",
fname);
exit (1);
}
fprintf (fp, "%s\n", txt);
fclose (fp);
}
/*
* The callbacks for the Three buttons: Exit, Clear, Save and Go:
*/
/* ARGSUSED */
static void
cb_clear (w, text_ptr, call_data)
Widget w;
XtPointer text_ptr, call_data;
{
Widget text = (Widget) text_ptr;
Arg args[1];
XtSetArg (args[0], XtNstring, "");
XtSetValues (text, args, ONE);
}
/* ARGSUSED */
static void
cb_save (w, text_ptr, call_data)
Widget w;
XtPointer text_ptr, call_data;
{
Widget text = (Widget) text_ptr;
Arg args[1];
String str;
XtSetArg(args[0], XtNstring, &str);
XtGetValues(text, args, ONE);
save_file (str);
}
/* ARGSUSED */
static void
cb_bexit (w, text_ptr, call_data)
Widget w;
XtPointer text_ptr, call_data;
{
cb_save (w, text_ptr, call_data);
exit (0);
}
/* ARGSUSED */
static void
cb_go (w, text_ptr, call_data)
Widget w;
XtPointer text_ptr, call_data;
{
cb_save (w, text_ptr, call_data);
have_a_run ();
}
/*
* Try to get a linenumber from this line: error lines are looking like:
* nase.a60: 12: parse error
* return the linenumber or return a 0.
*/
static int
is_error_line (s)
char *s;
{
int lno = 0;
int len = strlen (fname);
if (! strncmp (fname, s, len) && s [len] == ':')
lno = atoi (s + len + 1);
return lno;
}
/*
* read the lines from fp look about an error message (to set the
* caret [cursor]) and append the line to the output.
*/
static void
process_a60 (fp)
FILE *fp;
{
char buf [1024]; /* fixed length :-( */
int cursor_set = 0, lno;
while (buf == fgets (buf, 1024, fp)) {
append_text (otext, buf);
if (! cursor_set) {
lno = is_error_line (buf);
if (lno) {
set_caret (lno);
cursor_set = 1;
}
}
}
}
/*
* process the buffer through a60. a single directional pipe is enough
* and i'll use popen.
* (may be a fork providing a stdin from this process would be nice)
*/
static void
have_a_run ()
{
FILE *fp;
char cmd [100];
char tmp [100];
sprintf (cmd, "%s %s %s", A60PATH, A60FLAGS, fname);
fp = popen (cmd, "r");
if (! fp) {
sprintf (tmp, "cannot execute `%s'.\n", cmd);
append_text (otext, tmp);
}
else {
sprintf (tmp, "*** a60 starting:\n");
append_text (otext, tmp);
process_a60 (fp);
pclose (fp);
append_text (otext, "*** a60 done.\n\n");
}
}
static void
usage ()
{
fprintf (stderr, "Use: xa60 [ -V ] | [ <source file> ]\n");
exit (1);
}
/*
* M A I N
*/
int
main (argc, argv)
int argc;
char *argv[];
{
XtAppContext app_con;
Widget toplevel, paned, box, clear, bexit, go;
Arg args[1];
char *fn_str;
#if SAVE_BUTTEN
Widget save;
#endif
toplevel = XtAppInitialize (&app_con, "XA60", NULL, ZERO,
&argc, argv, fallback_resources, NULL, ZERO);
/*
* Check to see that all arguments were processed, and if not then
* report an error and exit.
*/
if (argc > 2)
usage ();
if (argc == 2)
{
if (! strcmp (argv [1], "-V"))
{
printf ("Version: %s.\n", VERSION);
exit (0);
}
else if (! strcmp (argv [1], "-h"))
{
usage ();
}
else {
fname = argv [1];
}
}
else {
fname = mk_fname ();
}
fn_str = XtMalloc (strlen (fname) + 20);
sprintf (fn_str, " File: %s", fname);
read_file ();
paned = XtCreateManagedWidget ("paned", panedWidgetClass, toplevel,
NULL, ZERO);
box = XtCreateManagedWidget ("box", boxWidgetClass, paned,
NULL, ZERO);
bexit = XtCreateManagedWidget ("bexit", commandWidgetClass, box,
NULL, ZERO);
clear = XtCreateManagedWidget ("clear", commandWidgetClass, box,
NULL, ZERO);
#if SAVE_BUTTEN
save = XtCreateManagedWidget ("save", commandWidgetClass, box,
NULL, ZERO);
#endif
go = XtCreateManagedWidget ("go", commandWidgetClass, box,
NULL, ZERO);
XtSetArg (args[0], XtNlabel, fn_str);
XtCreateManagedWidget ("fnlab", labelWidgetClass, box, args, ONE);
XtSetArg (args[0], XtNstring, txt_buf);
etext = XtCreateManagedWidget ("etext", asciiTextWidgetClass, paned,
args, ONE);
XtSetArg (args[0], XtNstring, "See:\n");
otext = XtCreateManagedWidget ("otext", asciiTextWidgetClass, paned,
args, ONE);
XtAddCallback (bexit, XtNcallback, cb_bexit, (XtPointer) etext);
XtAddCallback (clear, XtNcallback, cb_clear, (XtPointer) etext);
#if SAVE_BUTTEN
XtAddCallback (save, XtNcallback, cb_save, (XtPointer) etext);
#endif
XtAddCallback (go, XtNcallback, cb_go, (XtPointer) etext);
XtRealizeWidget (toplevel);
XtAppMainLoop (app_con);
/* not reached */
return 0;
}
/* end of xa60.c */
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