GSP
Quick Navigator

Search Site

Unix VPS
A - Starter
B - Basic
C - Preferred
D - Commercial
MPS - Dedicated
Previous VPSs
* Sign Up! *

Support
Contact Us
Online Help
Handbooks
Domain Status
Man Pages

FAQ
Virtual Servers
Pricing
Billing
Technical

Network
Facilities
Connectivity
Topology Map

Miscellaneous
Server Agreement
Year 2038
Credits
 

USA Flag

 

 

Man Pages
Eval::WithLexicals(3) User Contributed Perl Documentation Eval::WithLexicals(3)

Eval::WithLexicals - pure perl eval with persistent lexical variables

  # 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
  $

  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'
  );

  my @return_value = $eval->eval($code_to_eval);

  my $current_lexicals = $eval->lexicals;

  $eval->lexicals(\%new_lexicals);

  my $current_package = $eval->in_package;

  $eval->in_package($new_package);

  my $current_context = $eval->context;

  $eval->context($new_context); # 'list', 'scalar' or 'void'

Code to run before evaling code. Loads strictures by default.

  my $current_prelude = $eval->prelude;

  $eval->prelude(q{use warnings}); # only warnings, not strict.

  my $eval = Eval::WithLexicals->with_plugins("HintPersistence")->new;

Construct a class with the given plugins. Plugins are roles located under a package name like "Eval::WithLexicals::With*".

Current plugins are:

HintPersistence

When enabled this will persist pragams and other compile hints between evals (for example the strict and warnings flags in effect). See Eval::WithLexicals::WithHintPersistence for further details.

Matt S. Trout <mst@shadowcat.co.uk>

David Leadbeater <dgl@dgl.cx>

haarg - Graham Knop (cpan:HAARG) <haarg@cpan.org>

Copyright (c) 2010 the Eval::WithLexicals "AUTHOR" and "CONTRIBUTORS" as listed above.

This library is free software and may be distributed under the same terms as perl itself.
2015-07-01 perl v5.32.1

Search for    or go to Top of page |  Section 3 |  Main Index

Powered by GSP Visit the GSP FreeBSD Man Page Interface.
Output converted with ManDoc.