#!/bin/sh -e

# Make certain that the script is not running in an internationalized
# environment.
LANG=C ; export LANG
LC_ALL=C ; export LC_ALL

if test $# -ne 3
then
    echo "Usage: $0 <h|inc> <observer.texi> <observer.out>" 1>&2
    exit 0
fi

lang=$1 ; shift
texi=$1 ; shift
o=$1
case $lang in
  h) tmp=htmp ;;
  inc) tmp=itmp ;;
esac
otmp="`echo $1 | sed -e 's,\.[^.]*$,,'`.$tmp"; shift
echo "Creating ${otmp}" 1>&2
rm -f ${otmp}

# Can use any of the following: cat cmp cp diff echo egrep expr false
# grep install-info ln ls mkdir mv pwd rm rmdir sed sleep sort tar
# test touch true

cat <<EOF >>${otmp}
/* GDB Notifications to Observers.

   Copyright (C) 2004-2017 Free Software Foundation, Inc.

   This file is part of GDB.

   This program 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 3 of the License, or
   (at your option) any later version.
  
   This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.

   --

   This file was generated using observer.sh and observer.texi.  */

EOF


case $lang in
    h) cat <<EOF >>${otmp}
#ifndef OBSERVER_H
#define OBSERVER_H

struct observer;
struct bpstats;
struct so_list;
struct objfile;
struct thread_info;
struct inferior;
struct trace_state_variable;
class user_selection;
EOF
        ;;
esac

# We are about to set IFS=:, so DOS-style file names with a drive
# letter and a colon will be in trouble.

if test -n "$DJGPP"
then
     texi=`echo $texi | sed -e 's,^\([a-zA-Z]\):/,/dev/\1/,'`
fi

# generate a list of events that can be observed

IFS=:
sed -n '
/@deftypefun void/{
# Save original line for later processing into the actual parameter
    h
# Convert from: @deftypefun void EVENT (TYPE @var{PARAM},...)
# to event and formals: EVENT:TYPE PARAM, ...:
    s/^.* void \([a-z_][a-z_]*\) (\(.*\))$/\1:\2/
    s/@var{//g
    s/}//g
# Switch to held
    x
# Convert from: @deftypefun void FUNC (TYPE @var{PARAM},...)
# to actuals: PARAM, ...
    s/^[^{]*[{]*//
    s/[}]*[^}]*$//
    s/}[^{]*{/, /g
# Combine held (EVENT:TYPE PARAM, ...:) and pattern (PARAM, ...) into
# FUNC:TYPE PARAM, ...:PARAM, ...
    H
    x
    s/\n/:/g
    p
}
' $texi | while read event formal actual
do
  case $lang in
      h) cat <<EOF >>${otmp}

/* ${event} notifications.  */

typedef void (observer_${event}_ftype) (${formal});

extern struct observer *observer_attach_${event} (observer_${event}_ftype *f);
extern void observer_detach_${event} (struct observer *observer);
extern void observer_notify_${event} (${formal});
EOF
	;;

      inc)
      	cat <<EOF >>${otmp}

/* ${event} notifications.  */

static struct observer_list *${event}_subject = NULL;

EOF
	if test "$formal" != "void"; then
	    cat<<EOF >>${otmp}
struct ${event}_args { `echo "${formal}" | sed -e 's/,/;/g'`; };

EOF
	fi
	cat <<EOF >>${otmp}
static void
observer_${event}_notification_stub (const void *data, const void *args_data)
{
  observer_${event}_ftype *notify = (observer_${event}_ftype *) data;
EOF

	notify_args=`echo ${actual} | sed -e 's/\([a-z0-9_][a-z0-9_]*\)/args->\1/g'`

	if test ! -z "${notify_args}"; then
	    cat<<EOF >>${otmp}
  const struct ${event}_args *args = (const struct ${event}_args *) args_data;
EOF
	fi
	cat <<EOF >>${otmp}
  notify (${notify_args});
}

struct observer *
observer_attach_${event} (observer_${event}_ftype *f)
{
  return generic_observer_attach (&${event}_subject,
				  &observer_${event}_notification_stub,
				  (void *) f);
}

void
observer_detach_${event} (struct observer *observer)
{
  generic_observer_detach (&${event}_subject, observer);
}

void
observer_notify_${event} (${formal})
{
EOF
	if test "$formal" != "void"; then
	    cat<<EOF >>${otmp}
  struct ${event}_args args;
  `echo ${actual} | sed -e 's/\([a-z0-9_][a-z0-9_]*\)/args.\1 = \1/g'`;

EOF
	else
	    echo "char *args = NULL;" >> ${otmp}
	fi
	cat<<EOF >>${otmp}
  if (observer_debug)
    fprintf_unfiltered (gdb_stdlog, "observer_notify_${event}() called\n");
  generic_observer_notify (${event}_subject, &args);
}
EOF
	;;
    esac
done


case $lang in
    h) cat <<EOF >>${otmp}

#endif /* OBSERVER_H */
EOF
esac


echo Moving ${otmp} to ${o}
mv ${otmp} ${o}