#! /usr/bin/perl -w
#
# apply_cr.pl - apply specified CRs to text on standard input
# Copyright (C) 2004 Geraint Paul Bevan
#
# 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 2 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, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# --------------------------
# Model Transformation Tools
# --------------------------
#
#
#-------------------------------------------------------------------------------
use strict;
use Getopt::Long;
my $cr_name='';
#-------------------------------------------------------------------------------
# arguments and options
#-------------------------------------------------------------------------------
my $crlist = '';
my $debug = 0;
my $help = 0;
GetOptions ('debug' => \$debug,
'help' => \$help);
#-------------------------------------------------------------------------------
# globals
#-------------------------------------------------------------------------------
my @expressions;
my @prefixes;
my $expression;
my $i = 0;
#-------------------------------------------------------------------------------
# subroutine declarations
#-------------------------------------------------------------------------------
sub substitute_subexpressions();
sub process_expression();
sub display_subexpressions();
sub reassemble_expression();
sub usage();
#-------------------------------------------------------------------------------
# main
#-------------------------------------------------------------------------------
if ($help) {
usage();
exit 1;
}
while (<STDIN>) {
$expression = $_;
print STDERR "Start Expression -> $expression\n" if $debug;
$i = 0;
@expressions = ();
@prefixes = ();
substitute_subexpressions();
display_subexpressions () if ($debug);
for ($i = 0; $i <= $#expressions; $i++) {
my $result = process_expression ();
if ($result) {
$prefixes[$i] = "";
$expressions[$i] = "$result";
}
}
display_subexpressions () if ($debug);
reassemble_expression ();
print STDOUT "$expression";
}
#-------------------------------------------------------------------------------
# subroutines
#-------------------------------------------------------------------------------
sub substitute_subexpressions() {
while ($expression =~ /\(.*\)/) {
$_ = $expression;
# get a matched pair of brackets
s/ (.*) ( \({1} [^\(\)]* \){1} ) (.*) /$1 : $2 : $3/x;
my $extracted;
my $remainder;
my $skipped;
($skipped, $extracted, $remainder) = split (/ : /);
$expressions[$i] = $extracted if $extracted;
$_ = $skipped;
s/(\s)//g; # strip whitespace
s/ (.*?) (\w*)$ /$2/x; # get function name (if any)
$prefixes[$i] = $_;
$skipped =~ s/(.*)$prefixes[$i]$/$1/;
$expression = "$skipped\{$i\}$remainder";
$i++;
}
$expressions[$i] = $expression;
# $prefixes[$i] = "";
}
#-------------------------------------------------------------------------------
sub process_expression() {
my $cr = '';
foreach my $cr_name (@ARGV) {
if ($prefixes[$i]) {
if ($prefixes[$i] eq $cr_name) {
$cr = $cr_name;
}
}
}
if ($cr eq '') {
return;
}
# call cr(arg1,arg2,...)
if (-e "$cr.pm") {
no strict 'refs'; # allow symbolic references
my $expr = $expressions[$i];
eval "require $cr";
$cr->import (@_[1 .. $#_]);
&$cr ($expr);
use strict 'refs';
}
}
#-------------------------------------------------------------------------------
sub display_subexpressions() {
for ($i = 0; $i <= $#expressions; $i++) {
my $prefix = " ";
$prefix = $prefixes[$i] if ($prefixes[$i]);
print STDERR "$i\t($prefix)\t$expressions[$i]\n\n";
}
}
#-------------------------------------------------------------------------------
sub reassemble_expression () {
$expression = $expressions[$#expressions];
for ($i = $#expressions; $i >= 0; $i--) {
print STDERR "{$i}: $expressions[$i]\n" if $debug;
$expression =~ s/\{$i\}/$prefixes[$i]$expressions[$i]/g;
}
print STDERR "Final expression -> $expression\n" if $debug;
}
#-------------------------------------------------------------------------------
sub usage() {
print STDOUT
"\nUsage: $0 [options] crname1 crname2 ..\n" .
"\n" .
"\toptions:\n" .
"\t--debug\n" .
"\t--help\n" .
"\n";
}