package Eval::WithLexicals;
use Moo;
+use Moo::Role ();
use Sub::Quote;
+our $VERSION = '1.003003'; # 1.3.3
+$VERSION = eval $VERSION;
+
has lexicals => (is => 'rw', default => quote_sub q{ {} });
{
isa => sub {
my ($val) = @_;
die "Invalid context type $val - should be list, scalar or void"
- unless $valid_contexts{$val};
+ unless $valid_contexts{$val};
},
);
}
is => 'rw', default => quote_sub q{ 'Eval::WithLexicals::Scratchpad' }
);
+has prelude => (
+ is => 'rw', default => quote_sub q{ 'use strictures 1;' }
+);
+
+sub with_plugins {
+ my($class, @names) = @_;
+
+ Moo::Role->create_class_with_roles($class,
+ map "Eval::WithLexicals::With$_", @names);
+}
+
+sub setup_code {
+ my($self) = @_;
+ $self->prelude;
+}
+
+sub capture_code {
+ ( qq{ BEGIN { Eval::WithLexicals::Util::capture_list() } } )
+}
+
sub eval {
my ($self, $to_eval) = @_;
local *Eval::WithLexicals::Cage::current_line;
local *Eval::WithLexicals::Cage::pad_capture;
local *Eval::WithLexicals::Cage::grab_captures;
- my $setup = Sub::Quote::capture_unroll('$_[2]', $self->lexicals, 2);
+
my $package = $self->in_package;
- local our $current_code = qq!use strictures 1;
-${setup}
+ my $setup_code = join '', $self->setup_code,
+ # $_[2] being what is passed to _eval_do below
+ Sub::Quote::capture_unroll('$_[2]', $self->lexicals, 2);
+
+ my $capture_code = join '', $self->capture_code;
+
+ local our $current_code = qq!
+${setup_code}
sub Eval::WithLexicals::Cage::current_line {
package ${package};
+#line 1 "(eval)"
${to_eval}
;sub Eval::WithLexicals::Cage::pad_capture { }
-BEGIN { Eval::WithLexicals::Util::capture_list() }
+${capture_code}
sub Eval::WithLexicals::Cage::grab_captures {
- no warnings 'closure'; no strict 'refs';
- package Eval::WithLexicals::Cage;!;
- $self->_eval_do(\$current_code, $self->lexicals);
+ no warnings 'closure'; no strict 'vars';
+ package! # hide from PAUSE
+ .q! Eval::WithLexicals::VarScope;!;
+ # rest is appended by Eval::WithLexicals::Util::capture_list, called
+ # during parsing by the BEGIN block from capture_code.
+
+ $self->_eval_do(\$current_code, $self->lexicals, $to_eval);
+ $self->_run(\&Eval::WithLexicals::Cage::current_line);
+}
+
+sub _run {
+ my($self, $code) = @_;
+
my @ret;
my $ctx = $self->context;
if ($ctx eq 'list') {
- @ret = Eval::WithLexicals::Cage::current_line();
+ @ret = $code->();
} elsif ($ctx eq 'scalar') {
- $ret[0] = Eval::WithLexicals::Cage::current_line();
+ $ret[0] = $code->();
} else {
- Eval::WithLexicals::Cage::current_line();
+ $code->();
}
$self->lexicals({
%{$self->lexicals},
- %{Eval::WithLexicals::Cage::grab_captures()}
+ %{$self->_grab_captures},
});
@ret;
}
+sub _grab_captures {
+ my ($self) = @_;
+ my $cap = Eval::WithLexicals::Cage::grab_captures();
+ foreach my $key (keys %$cap) {
+ my ($sigil, $name) = $key =~ /^(.)(.+)$/;
+ my $var_scope_name = $sigil.'Eval::WithLexicals::VarScope::'.$name;
+ if ($cap->{$key} eq eval "\\${var_scope_name}") {
+ delete $cap->{$key};
+ }
+ }
+ $cap;
+}
+
sub _eval_do {
- my ($self, $text_ref) = @_;
+ my ($self, $text_ref, $lexical, $original) = @_;
local @INC = (sub {
if ($_[1] eq '/eval_do') {
open my $fh, '<', $text_ref;
();
}
}, @INC);
- do '/eval_do' or die "Error: $@\nCompiling: $$text_ref";
+ do '/eval_do' or die $@;
}
{
- package Eval::WithLexicals::Util;
+ package # hide from PAUSE
+ Eval::WithLexicals::Util;
use B qw(svref_2object);
sub capture_list {
my $pad_capture = \&Eval::WithLexicals::Cage::pad_capture;
- my @names = map $_->PV, grep $_->isa('B::PV'),
+ my @names = grep defined && length && $_ ne '&', map $_->PV, grep $_->can('PV'),
svref_2object($pad_capture)->OUTSIDE->PADLIST->ARRAYelt(0)->ARRAY;
$Eval::WithLexicals::current_code .=
'+{ '.join(', ', map "'$_' => \\$_", @names).' };'
}
1;
+__END__
+
+=head1 NAME
+
+Eval::WithLexicals - pure perl eval with persistent lexical variables
+
+=head1 SYNOPSIS
+
+ # file: bin/tinyrepl
+
+ #!/usr/bin/env perl
+
+ use strictures 1;
+ use Eval::WithLexicals;
+ use Term::ReadLine;
+ use Data::Dumper;
+ use Getopt::Long;
+
+ GetOptions(
+ "plugin=s" => \my @plugins
+ );
+
+ $SIG{INT} = sub { warn "SIGINT\n" };
+
+ { package Data::Dumper; no strict 'vars';
+ $Terse = $Indent = $Useqq = $Deparse = $Sortkeys = 1;
+ $Quotekeys = 0;
+ }
+
+ my $eval = @plugins
+ ? Eval::WithLexicals->with_plugins(@plugins)->new
+ : Eval::WithLexicals->new;
+
+ my $read = Term::ReadLine->new('Perl REPL');
+ while (1) {
+ my $line = $read->readline('re.pl$ ');
+ exit unless defined $line;
+ my @ret; eval {
+ local $SIG{INT} = sub { die "Caught SIGINT" };
+ @ret = $eval->eval($line); 1;
+ } or @ret = ("Error!", $@);
+ print Dumper @ret;
+ }
+
+ # shell session:
+
+ $ perl -Ilib bin/tinyrepl
+ re.pl$ my $x = 0;
+ 0
+ re.pl$ ++$x;
+ 1
+ re.pl$ $x + 3;
+ 4
+ re.pl$ ^D
+ $
+
+=head1 METHODS
+
+=head2 new
+
+ my $eval = Eval::WithLexicals->new(
+ lexicals => { '$x' => \1 }, # default {}
+ in_package => 'PackageToEvalIn', # default Eval::WithLexicals::Scratchpad
+ context => 'scalar', # default 'list'
+ prelude => 'use warnings', # default 'use strictures 1'
+ );
+
+=head2 eval
+
+ my @return_value = $eval->eval($code_to_eval);
+
+=head2 lexicals
+
+ my $current_lexicals = $eval->lexicals;
+
+ $eval->lexicals(\%new_lexicals);
+
+=head2 in_package
+
+ my $current_package = $eval->in_package;
+
+ $eval->in_package($new_package);
+
+=head2 context
+
+ my $current_context = $eval->context;
+
+ $eval->context($new_context); # 'list', 'scalar' or 'void'
+
+=head2 prelude
+
+Code to run before evaling code. Loads L<strictures> by default.
+
+ my $current_prelude = $eval->prelude;
+
+ $eval->prelude(q{use warnings}); # only warnings, not strict.
+
+=head2 with_plugins
+
+ my $eval = Eval::WithLexicals->with_plugins("HintPersistence")->new;
+
+Construct a class with the given plugins. Plugins are roles located under
+a package name like C<Eval::WithLexicals::With*>.
+
+Current plugins are:
+
+=over 4
+
+=item * HintPersistence
+
+When enabled this will persist pragams and other compile hints between evals
+(for example the L<strict> and L<warnings> flags in effect). See
+L<Eval::WithLexicals::WithHintPersistence> for further details.
+
+=back
+
+=head1 AUTHOR
+
+Matt S. Trout <mst@shadowcat.co.uk>
+
+=head1 CONTRIBUTORS
+
+David Leadbeater <dgl@dgl.cx>
+
+haarg - Graham Knop (cpan:HAARG) <haarg@cpan.org>
+
+=head1 COPYRIGHT
+
+Copyright (c) 2010 the Eval::WithLexicals L</AUTHOR> and L</CONTRIBUTORS>
+as listed above.
+
+=head1 LICENSE
+
+This library is free software and may be distributed under the same terms
+as perl itself.
+
+=cut
projects / p5sagit/Eval-WithLexicals.git / blobdiff