/usr/share/perl5/Devel/REPL/Plugin/MultiLine/PPI.pm is in libdevel-repl-perl 1.003012-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 | package Devel::REPL::Plugin::MultiLine::PPI;
use Devel::REPL::Plugin;
use PPI;
use namespace::clean -except => [ 'meta' ];
has 'continuation_prompt' => (
is => 'rw', required => 1, lazy => 1,
default => sub { '> ' }
);
has 'line_depth' => (
is => 'rw', required => 1, lazy => 1,
default => sub { 0 }
);
around 'read' => sub {
my $orig = shift;
my ($self, @args) = @_;
my $line = $self->$orig(@args);
if (defined $line) {
return $self->continue_reading_if_necessary($line, @args);
} else {
return $line;
}
};
sub continue_reading_if_necessary {
my ( $self, $line, @args ) = @_;
while ($self->line_needs_continuation($line)) {
my $orig_prompt = $self->prompt;
$self->prompt($self->continuation_prompt);
$self->line_depth($self->line_depth + 1);
my $append = $self->read(@args);
$self->line_depth($self->line_depth - 1);
$line .= "\n$append" if defined($append);
$self->prompt($orig_prompt);
# ^D means "shut up and eval already"
return $line if !defined($append);
}
return $line;
}
sub line_needs_continuation
{
my $repl = shift;
my $line = shift;
# add this so we can test whether the document ends in PPI::Statement::Null
$line .= "\n;;";
my $document = PPI::Document->new(\$line);
return 0 if !defined($document);
# adding ";" to a complete document adds a PPI::Statement::Null. we added a ;;
# so if it doesn't end in null then there's probably something that's
# incomplete
return 0 if $document->child(-1)->isa('PPI::Statement::Null');
# this could use more logic, such as returning 1 on s/foo/ba<Enter>
my $unfinished_structure = sub
{
my ($document, $element) = @_;
return 0 unless $element->isa('PPI::Structure');
return 1 unless $element->finish;
return 0;
};
return $document->find_any($unfinished_structure);
}
1;
__END__
=head1 NAME
Devel::REPL::Plugin::MultiLine::PPI - read lines until all blocks are closed
=head1 SYNOPSIS
#!/usr/bin/perl
use lib './lib';
use Devel::REPL;
my $repl = Devel::REPL->new;
$repl->load_plugin('LexEnv');
$repl->load_plugin('History');
$repl->load_plugin('MultiLine::PPI');
$repl->run;
=head1 DESCRIPTION
Plugin that will collect lines until you have no unfinished structures. This
lets you write subroutines, C<if> statements, loops, etc. more naturally.
For example, without a MultiLine plugin,
$ my $x = 3;
3
$ if ($x == 3) {
will throw a compile error, because that C<if> statement is incomplete. With a
MultiLine plugin,
$ my $x = 3;
3
$ if ($x == 3) {
> print "OH NOES!"
> }
OH NOES
1
you may write the code across multiple lines, such as in C<irb> and C<python>.
This module uses L<PPI>. This plugin is named C<MultiLine::PPI> because someone
else may conceivably implement similar behavior some other less
dependency-heavy way.
=head1 SEE ALSO
C<Devel::REPL>
=head1 AUTHOR
Shawn M Moore, C<< <sartak at gmail dot com> >>
=head1 COPYRIGHT AND LICENSE
Copyright (C) 2007 by Shawn M Moore
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.
=cut
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