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           dishes => $clone->{dishes},
         );

         my $sous_done   = $sous_recipe->execute( $recipes );

         $self->output( $sous_done->output() );

         $self -> {bowls} -> [0]
           -> put( $sous_done -> first_bowl() -> new() -> pour() );

      } elsif ( $return =~ /^loop\.([^\.]+)\.([^\.]+)/ ) {
         my $verb = $1;
         my $ingr = $2;

         push @loop_stack, $verb;

         if ( not $self -> {ingredients} -> {$ingr} -> value() ) {
            pop @loop_stack;
            $exec_pos = $self -> {loops} -> {$verb} -> {end};
         }

      } elsif ( $return =~ /^endloop\.([^\.]+)/ ) {
         my $verb = $1;

         $exec_pos = $self -> {loops} -> {$verb} -> {start} - 1;

      } elsif ( $return =~ /^break/ ) {
         my $verb = pop @loop_stack;
         $exec_pos = $self -> {loops} -> {$verb} -> {end};
      }

      $exec_pos++;
      last if $exec_pos > $max_pos;
   }

   if ( $self->{serves} ) {
      foreach my $serve ( 0..($self->{serves}-1) ) {
         last if $serve > $#{$self->{dishes}};
         my $string = $self->{dishes}->[$serve]->print();
         $self->{output} .= $string;
      }
   }

   return $self;
}

=item first_bowl

Returns the first bowl of the recipe.

=cut

sub first_bowl {
   my $self = shift;
   return $self->{bowls}->[0];
}

=item require_ingredient

First argument must be an ingredient object. Second may be a string indicating
the location of the requirement. Throws a fatal error if the ingredient is not
present.

=cut

sub require_ingredient {
   my $self = shift;
   my $ingredient = shift;
   my $sub = shift;

   (defined $ingredient and exists $self->{ingredients}{$ingredient})
     or croak "Unknown ingredient '".(defined$ingredient?$ingredient:'<undefined>').
              "' required for recipe '$self->{name}'".
              (defined $sub?" in '$sub'":'').".";

   return $self;
}

=item output

Mutator for the Recipe output.

=cut

sub output {
   my $self = shift;

   $self->{output} .= shift if @_;

   return $self->{output};
}

=item require_bowl

First argument must be a number of bowls. Additional bowls are added to the
recipe if it currently has less than this number of bowls.

=cut

sub require_bowl {
   my $self = shift;
   my $no   = shift;

   return if @{$self->{bowls}} >= $no;

   while (@{$self->{bowls}} < $no) {
      push @{$self->{bowls}}, Acme::Chef::Container->new();
   }

   return $self;
}


=item require_dish

First argument must be a number of dishes. Additional dishes are added to the
recipe if it currently has less than this number of dishes.

=cut

sub require_dish {
   my $self = shift;
   my $no   = shift;

   return if @{$self->{dishes}} >= $no;

   while (@{$self->{dishes}} < $no) {
      push @{$self->{dishes}}, Acme::Chef::Container->new();
   }

   return $self;
}

=item recipe_name

Mutator for the recipe name.

=cut

sub recipe_name {
   my $self = shift;

   $self->{name} = shift if @_;

   return $self->{name};
}


=item compile

Tries to compile the recipe. Returns 0 on error or if the recipe was
already compiled. Returns the compiled recipe if the compilation succeeded.

=cut

sub compile {
   my $self = shift;

   return 0 if $self->{compiled};

   my @ingredients = split /\n/, $self->{ingredients};

   shift @ingredients; # remove header line

   @ingredients or croak "Failed compiling recipe. No ingredients specified.";

   my %ingredients;
   my $ingredient_no = 0;

   foreach (@ingredients) {
      $ingredient_no++;

      my $value;
      if (s/^[ ]*(\d+)[ ]//) {
         $value = $1;
      } else {
         $value = undef;
      }

      my $measure_type = '';
      foreach my $type ( keys %Acme::Chef::Ingredient::MeasureTypes ) {
         if ( s/^\Q$type\E[ ]// ) {
            $measure_type = $type;
            last;
         }
      }

      my $measure = '';
      foreach my $meas ( keys %Acme::Chef::Ingredient::Measures ) {
         next if $meas eq '';

         if ( s/^\Q$meas\E[ ]// ) {
            $measure = $meas;
            last;
         }
      }

      /[ ]*([\-\w][\- \w]*)[ ]*$/
        or croak "Invalid ingredient specification (ingredient no. $ingredient_no, name).";

      my $ingredient_name = $1;

      my $ingredient = Acme::Chef::Ingredient->new(
        name         => $ingredient_name,
        value        => $value,
        measure      => $measure,
        measure_type => $measure_type,
      );

      $ingredients{$ingredient_name} = $ingredient;
   }