src/HOL/Tools/SMT/lib/scripts/z3_wrapper

added self-correcting wrapper for Z3 -- see comment in the file for details

#!/usr/bin/env perl
#
# Author: Jasmin Blanchette, TU Muenchen
#
# Invoke Z3 with error detection and correction.
# To use this wrapper, set
#
#     Z3_REAL_SOLVER=/path-to-z3/z3
#     Z3_SOLVER=$ISABELLE_HOME/src/HOL/Tools/SMT/lib/scripts/z3_wrapper
#
# in your "~/.isabelle/etc/settings" file.

my $in_file = @ARGV[$ARGV - 1];
my $out_file = "/tmp/foo"; # FIXME
my $err_file = "/tmp/bar"; # FIXME

$ENV{'Z3_REAL_SOLVER'} || die "Environment variable \"Z3_REAL_SOLVER\" not set";

RUN:
my $code = system $ENV{'Z3_REAL_SOLVER'} . " " . join(" ", @ARGV) . " >$out_file 2>$err_file";

if ($code == 0) {
  open(OUT_FILE, "<$out_file") || die "Cannot open file \"$out_file\"";
  my @out_lines = <OUT_FILE>;
  close(OUT_FILE);
  print @out_lines;
} else {
  open(ERR_FILE, "<$err_file") || die "Cannot open file \"$err_file\"";
  my @err_lines = <ERR_FILE>;
  close(ERR_FILE);
  foreach (@err_lines) {
    if (m/[lL]ine ([0-9]+)/) {
      open(IN_FILE, "<$in_file") || die "Cannot open file \"$in_file\"";
      my @in_lines = <IN_FILE>;
      close(IN_FILE);
      delete $in_lines[$1 - 1];
      open(IN_FILE, ">$in_file") || die "Cannot open file \"$in_file\"";
      print IN_FILE join ("", @in_lines);
      close(IN_FILE);
      goto RUN;
    }
  }
  print STDERR @err_lines;
  exit $code;
}