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use 5.006;
# ABSTRACT: Minimal try/catch with proper preservation of $@

our $VERSION = '0.32';

use strict;
use warnings;

use Exporter 5.57 'import';
our @EXPORT = our @EXPORT_OK = qw(try catch finally);

use Carp;
$Carp::Internal{+__PACKAGE__}++;

BEGIN {
  my $su = $INC{'Sub/Util.pm'} && defined &Sub::Util::set_subname;
  my $sn = $INC{'Sub/Name.pm'} && eval { Sub::Name->VERSION(0.08) };
  unless ($su || $sn) {
    $su = eval { require Sub::Util; } && defined &Sub::Util::set_subname;
    unless ($su) {
      $sn = eval { require Sub::Name; Sub::Name->VERSION(0.08) };
    }
  }

  *_subname = $su ? \&Sub::Util::set_subname
            : $sn ? \&Sub::Name::subname
            : sub { $_[1] };
  *_HAS_SUBNAME = ($su || $sn) ? sub(){1} : sub(){0};
}

my %_finally_guards;

# Need to prototype as @ not $$ because of the way Perl evaluates the prototype.
# Keeping it at $$ means you only ever get 1 sub because we need to eval in a list
# context & not a scalar one

sub try (&;@) {
  my ( $try, @code_refs ) = @_;

  # we need to save this here, the eval block will be in scalar context due
  # to $failed
  my $wantarray = wantarray;

  # work around perl bug by explicitly initializing these, due to the likelyhood
  # this will be used in global destruction (perl rt#119311)
  my ( $catch, @finally ) = ();

  # find labeled blocks in the argument list.
  # catch and finally tag the blocks by blessing a scalar reference to them.
  foreach my $code_ref (@code_refs) {

    if ( ref($code_ref) eq 'Try::Tiny::Catch' ) {
      croak 'A try() may not be followed by multiple catch() blocks'
        if $catch;
      $catch = ${$code_ref};
    } elsif ( ref($code_ref) eq 'Try::Tiny::Finally' ) {
      push @finally, ${$code_ref};
    } else {
      croak(
        'try() encountered an unexpected argument ('
      . ( defined $code_ref ? $code_ref : 'undef' )
      . ') - perhaps a missing semi-colon before or'
      );
    }
  }

  # FIXME consider using local $SIG{__DIE__} to accumulate all errors. It's
  # not perfect, but we could provide a list of additional errors for
  # $catch->();

  # name the blocks if we have Sub::Name installed
  _subname(caller().'::try {...} ' => $try)
    if _HAS_SUBNAME;

  # set up scope guards to invoke the finally blocks at the end.
  # this should really be a function scope lexical variable instead of
  # file scope + local but that causes issues with perls < 5.20 due to
  # perl rt#119311
  local $_finally_guards{guards} = [
    map Try::Tiny::ScopeGuard->_new($_),
    @finally
  ];

  # save the value of $@ so we can set $@ back to it in the beginning of the eval
  # and restore $@ after the eval finishes
  my $prev_error = $@;

  my ( @ret, $error );

  # failed will be true if the eval dies, because 1 will not be returned
  # from the eval body
  my $failed = not eval {
    $@ = $prev_error;

    # evaluate the try block in the correct context
    if ( $wantarray ) {
      @ret = $try->();
    } elsif ( defined $wantarray ) {
      $ret[0] = $try->();
    } else {
      $try->();
    };

    return 1; # properly set $failed to false
  };

  # preserve the current error and reset the original value of $@
  $error = $@;
  $@ = $prev_error;

  # at this point $failed contains a true value if the eval died, even if some
  # destructor overwrote $@ as the eval was unwinding.
  if ( $failed ) {
    # pass $error to the finally blocks
    push @$_, $error for @{$_finally_guards{guards}};

    # if we got an error, invoke the catch block.
    if ( $catch ) {
      # This works like given($error), but is backwards compatible and
      # sets $_ in the dynamic scope for the body of C<$catch>
      for ($error) {
        return $catch->($error);
      }

      # in case when() was used without an explicit return, the C<for>
      # loop will be aborted and there's no useful return value
    }

    return;
  } else {
    # no failure, $@ is back to what it was, everything is fine