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Editing: perllinetype.pl

#!/usr/bin/perl -w
use strict;

# For each line in a perl script, write to STDOUT lines of the form
# line number : line type : line text
#
# usage:
# perllinetype myfile.pl >myfile.new
# perllinetype <myfile.pl >myfile.new
#
# This file is one of the examples distributed with perltidy and is a
# simple demonstration of using a callback object with Perl::Tidy.
#
# Steve Hancock, July 2003
#
use Getopt::Std;
use Perl::Tidy;
use IO::File;
$| = 1;
use vars qw($opt_h);
main();

sub main {
    my $usage = <<EOM;
   usage: perllinetype filename >outfile
EOM
    getopts('h') or die "$usage";
    if ($opt_h) { die $usage }

# Make the source for perltidy, which will be a filehandle
    # or just '-' if the source is stdin
    my ( $file, $fh, $source );
    if ( @ARGV == 0 ) {
        $source = '-';
    }
    elsif ( @ARGV == 1 ) {
        $file = $ARGV[0];
        $fh   = IO::File->new( $file, 'r' );
        unless ($fh) { die "cannot open '$file': $!\n" }
        $source = $fh;
    }
    else { die $usage }

# make the callback object
    my $formatter = MyFormatter->new();

my $dest;

# start perltidy, which will start calling our write_line()
    my $err = perltidy(
        'formatter'   => $formatter,     # callback object
        'source'      => $source,
        'destination' => \$dest,         # (not really needed)
        'argv'        => "-npro -se",    # dont need .perltidyrc
                                         # errors to STDOUT
    );
    if ($err) {
        die "Error calling perltidy\n";
    }
    $fh->close() if $fh;
}

package MyFormatter;

sub new {
    my ($class) = @_;
    bless {}, $class;
}

sub write_line {

# This is called from perltidy line-by-line
    my $self              = shift;
    my $line_of_tokens    = shift;
    my $line_type         = $line_of_tokens->{_line_type};
    my $input_line_number = $line_of_tokens->{_line_number};
    my $input_line        = $line_of_tokens->{_line_text};
    print "$input_line_number:$line_type:$input_line";
}

# called once after the last line of a file
sub finish_formatting {
    my $self = shift;
    return;
}

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