Admin/isa-migrate

added CONTRIBUTORS

#!/usr/bin/env perl
#
# $Id$
# Author: Florian Haftmann, TUM
#
# A generic framework script for simple theory file migrations
# (under developement)
#

use strict;
use File::Find;
use File::Basename;
use File::Copy;

# configuration
my @suffices = ('\.thy');
my $backupext = '.bak';

# migrator lookup hash
my %migrators = (
    id => sub {
        my ($file, @content) = @_;
    },
    thyheader => sub {
        my ($file, @content) = @_;
        $_ = join("", @content);
        if (m!\G
                ^
                    theory\s+([^ ]+)
                    (?:\s+(?:imports|=)\s+([^:]*?))?
                    (?:\s+(?:files|uses)\s+([^:]*?))?
                    \s*(?:begin|:)
             !cgomsx) {
            # STRATEGIE: abschnittsweises matchen, zwischendurch immer wieder whitespace
            # verarbeiten
        }
    }
);

# utility functions
sub skip_wscomment {
    my $commentlevel = 0;
    my @skipped = ();
    while () {
        if (m!\G\{\*!cgoms) {
            push(@skipped, $&);
            $commentlevel++;
        } elsif ($commentlevel > 0) {
            if (m!\G\*\}!cgoms) {
                push(@skipped, $&);
                $commentlevel--;
            } elsif (m!\G(?:
                        [^{*]|\*[^{}]|\{[^*]
                       )*!cgomsx) {
                push(@skipped, $&);
            } else {
                die ("probably incorrectly nested comment");
            }
        } elsif (m!\G\s+!cgoms) {
            push(@skipped, $&);
        } else {
            return join('', @skipped);
        }
    }
}

# process dir tree
sub process_tree {
    my ($root, $migrator, $backupext) = @_;
    find(sub { process($File::Find::name, $migrator, $backupext) }, $root);
}

# process single file
sub process {
    my ($file, $migrator, $backupext) = @_;
    my ($basename, $dirname, $ext) = fileparse($file, @suffices);
    #~ print "$file\n";
    if ($ext) {
        open ISTREAM, $file or die("error opening $file");
        my @content = <ISTREAM>;
        close ISTREAM;
        if ($backupext) {
            copy($file, "$file$backupext");
        }
        print "Migrating $file...\n";
        &$migrator($file, @content);
    }
}

# first argument: migrator name
my $migrator = $migrators{shift @ARGV};
$migrator or die ("invalid migrator name");
# other arguments: files or trees
foreach my $fileloc (@ARGV) {
    -e $fileloc or die ("no file $fileloc");
}
foreach my $fileloc (@ARGV) {
    if (-d $fileloc) {
        process_tree($fileloc, $migrator, $backupext);
    } else {
        process($fileloc, $migrator, $backupext);
    }
}