verilator/nodist/dot_importer

#!/usr/bin/env perl
# See copyright, etc in below POD section.
######################################################################

use warnings;
use Getopt::Long;
use IO::File;
use Pod::Usage;
use Data::Dumper; $Data::Dumper::Indent=1;
use strict;
use vars qw($Debug);

#======================================================================

our @Header;
our %Vertexes;
our @Edges;
our %Edges;

#======================================================================
# main

$Debug = 0;
my $opt_filename;
autoflush STDOUT 1;
autoflush STDERR 1;
if (! GetOptions(
          "help"        => \&usage,
          "debug"       => \&debug,
          "<>"          => \&parameter,
    )) {
    usage();
}

dotread($opt_filename);
cwrite("graph_export.cpp");

#----------------------------------------------------------------------

sub usage {
    pod2usage(-verbose=>2, -exitval=>0, -output=>\*STDOUT);
    exit(1);  # Unreachable
}

sub debug {
    $Debug = 1;
}

sub parameter {
    my $param = shift;
    if (!$opt_filename) {
        $opt_filename = $param;
    } else {
        die "%Error: Unknown parameter: $param\n";
    }
}

#######################################################################

sub dotread {
    my $filename = shift;

    my $fh = IO::File->new($filename) or die "%Error: $! $filename,";
    my $header = 1;
    my $vnum = 0;
    while (defined (my $line = $fh->getline)) {
        if ($line =~ /^\t([a-zA-Z0-9_]+)\t(.*)$/) {
            next if $1 eq 'nTITLE';
            $header = 0;
            $Vertexes{$1} = {num => $vnum++,
                             line => $line,
                             name => $1,};
        }
        elsif ($line =~ /^\t([a-zA-Z0-9_]+)\s+->\s+([a-zA-Z0-9_]+)\s+(.*)$/) {
            my $from=$1; my $to=$2;
            my $weight = 1; $weight = $1 if $line =~ /weight=(\d+)/;
            my $cutable = undef; $cutable = $1 if $line =~ /style=(\S+)/;
            my $edge =  {num => $vnum++,
                         line => $line,
                         weight => $weight,
                         cutable => $cutable,
                         from => $from,
                         to => $to,};
            push @Edges, $edge;
            $Edges{$from}{$to} = $edge;
        }
        elsif ($header) {
            push @Header, $line;
            print "IGNORE: $line";
        }
    }
}

#######################################################################

sub cwrite {
    my $filename = shift;

    my $fh = IO::File->new(">$filename") or die "%Error: $! $filename,";
    $fh->print("void V3GraphTestImport::dotImport() {\n");
    $fh->print("    DfaGraph* gp = &m_graph;\n");
    foreach my $ver (sort {$a->{num} <=> $b->{num}} (values %Vertexes)) {
        $fh->printf("    V3GraphTestVertex* %s = new V3GraphTestVertex(gp, \"%s\");  if (%s) {}\n",
                    $ver->{name}, $ver->{name}, $ver->{name});
    }
    $fh->print("\n");
    foreach my $edge (@Edges) {
        $fh->printf("    new V3GraphEdge(gp, %s, %s, %s, %s);\n",
                    $edge->{from}, $edge->{to},
                    $edge->{weight}, $edge->{cutable}?"true":"false");
    }
    $fh->print("}\n");
}

#######################################################################
__END__

=pod

=head1 NAME

dot_importer - Take graph .dot file and convert into .cpp file

=head1 SYNOPSIS

  dot_importer a.dot

=head1 DESCRIPTION

Dot_importer takes a graphvis .dot file and converts into .cpp file.  This
.cpp file is then manually included in V3GraphTest.cpp to verify various
sub-algorithms.

=head1 ARGUMENTS

=over 4

=item --help

Displays this message and program version and exits.

=back

=head1 DISTRIBUTION

Copyright 2005-2020 by Wilson Snyder. This program is free software; you
can redistribute it and/or modify it under the terms of either the GNU
Lesser General Public License Version 3 or the Perl Artistic License
Version 2.0.

SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0

=head1 AUTHORS

Wilson Snyder <wsnyder@wsnyder.org>

=head1 SEE ALSO

=cut

######################################################################
### Local Variables:
### compile-command: "./dot_importer | tee ~/d/a.dot"
### End: