package FFI::Platypus::TypeParser::Version1;

use strict;
use warnings;
use Carp qw( croak );
use base qw( FFI::Platypus::TypeParser );

# ABSTRACT: FFI Type Parser Version One
our $VERSION = '0.98'; # VERSION


our @CARP_NOT = qw( FFI::Platypus FFI::Platypus::TypeParser );

my %reserved = map { $_ => 1 } qw(
  string
  object
  type
  role
  union
  class
  struct
  record
  array
  senum
  enum
);

# The type parser is responsible for deciding if something is a legal
# alias name.  Since this needs to be checked before the type is parsed
# it is separate from set_alias below.
sub check_alias
{
  my($self, $alias) = @_;
  croak "spaces not allowed in alias" if $alias =~ /\s/;
  croak "allowed characters for alias: [A-Za-z0-9_]" if $alias !~ /^[A-Za-z0-9_]+$/;
  croak "reserved world \"$alias\" cannot be used as an alias"
    if $reserved{$alias};
  croak "alias \"$alias\" conflicts with existing type"
    if defined $self->type_map->{$alias}
    || $self->types->{$alias}
    || $self->global_types->{basic}->{$alias};
  return 1;
}

sub set_alias
{
  my($self, $alias, $type) = @_;
  $self->types->{$alias} = $type;
}

use constant type_regex =>

  qr/^                                                                                                                                                            #
                                                                                                                                                                  #
    \s*                                                                                                                                                           # prefix white space
                                                                                                                                                                  #
    (?:                                                                                                                                                           #
                                                                                                                                                                  #
      \( ([^)]*) \) -> (.*)                                                                                                                                       # closure  $1 argument types, $2 return type
      |                                                                                                                                                           #
      (?: string | record ) \s* \( \s* ([0-9]+) \s* \)                                                              (?: \s* (\*) | )                              # fixed record, fixed string $3, ponter $4
      |                                                                                                                                                           #
      record                \s* \( (  \s* (?: [A-Za-z_] [A-Za-z_0-9]* :: )* [A-Za-z_] [A-Za-z_0-9]* ) \s* \)        (?: \s* (\*) | )                              # record class $5, pointer $6
      |                                                                                                                                                           #
      ( (?: [A-Za-z_] [A-Za-z_0-9]* \s+ )* [A-Za-z_] [A-Za-z_0-9]* )         \s*                                                                                  # unit type name $7
                                                                                                                                                                  #
              (?:  (\*)  |   \[ ([0-9]*) \]  |  )                                                                                                                 # pointer $8,       array $9
      |                                                                                                                                                           #
      object                \s* \( \s* ( (?: [A-Za-z_] [A-Za-z_0-9]* :: )* [A-Za-z_] [A-Za-z_0-9]* )                                                              # object class $10
                                   (?: \s*,\s* ( (?: [A-Za-z_] [A-Za-z_0-9]* \s+ )* [A-Za-z_] [A-Za-z_0-9]* ) )?                                                  #        type $11
                                   \s*                                                                            \)                                              #
    )                                                                                                                                                             #
                                                                                                                                                                  #
    \s*                                                                                                                                                           # trailing white space
                                                                                                                                                                  #
  $/x;                                                                                                                                                            #

sub parse
{
  my($self, $name, $opt) = @_;

  $opt ||= {};

  return $self->types->{$name} if $self->types->{$name};

  $name =~ type_regex or croak "bad type name: $name";

  if(defined (my $at = $1))  # closure
  {
    my $rt = $2;
    return $self->types->{$name} = $self->create_type_closure(
      $self->parse($rt, $opt),
      map { $self->parse($_, $opt) } map { my $t = $_; $t =~ s/^\s+//; $t =~ s/\s+$//; $t } split /,/, $at,
    );
  }

  if(defined (my $size = $3))  # fixed record / fixed string
  {
    croak "fixed record / fixed string size must be larger than 0"
      unless $size > 0;

    if(my $pointer = $4)
    {
      return $self->types->{$name} = $self->create_type_record(
        $size,
        undef,
      );
    }
    elsif($opt->{member})
    {
      return $self->types->{"$name *"} = $self->create_type_record(
        $size,
        undef,
      );
    }
    else
    {
      croak "fixed string / classless record not allowed as value type";
    }
  }

  if(defined (my $class = $5))  # class record
  {
    my $size_method = $class->can('ffi_record_size') || $class->can('_ffi_record_size') || croak "$class has no ffi_record_size or _ffi_record_size method";
    if(my $pointer = $6)
    {
      return $self->types->{$name} = $self->create_type_record(
        $class->$size_method,
        $class,
      );
    }
    else
    {
      return $self->types->{$name} = $self->create_type_record_value(
        $class->$size_method,
        $class,
        $class->_ffi_meta->ffi_type,
      );
    }
  }

  if(defined (my $unit_name = $7))  # basic type
  {
    if($self->global_types->{basic}->{$unit_name})
    {
      if(my $pointer = $8)
      {
        croak "void pointer not allowed" if $unit_name eq 'void';
        return $self->types->{$name} = $self->global_types->{ptr}->{$unit_name};
      }

      if(defined (my $size = $9))  # array
      {
        croak "void array not allowed" if $unit_name eq 'void';
        if($size ne '')
        {
          croak "array size must be larger than 0" if $size < 1;
          return $self->types->{$name} = $self->create_type_array(
            $self->global_types->{basic}->{$unit_name}->type_code,
            $size,
          );
        }
        else
        {
          return $self->global_types->{array}->{$unit_name} ||= $self->create_type_array(
            $self->global_types->{basic}->{$unit_name}->type_code,
            0,
          );
        }
      }

      # basic type with no decorations
      return $self->global_types->{basic}->{$unit_name};
    }

    if(my $map_name = $self->type_map->{$unit_name})
    {
      if(my $pointer = $8)
      {
        return $self->types->{$name} = $self->parse("$map_name *", $opt);
      }
      if(defined (my $size = $9))
      {
        if($size ne '')
        {
          croak "array size must be larger than 0" if $size < 1;
          return $self->types->{$name} = $self->parse("$map_name [$size]", $opt);
        }
        else
        {
          return $self->types->{$name} = $self->parse("$map_name []", $opt);
        }
      }

      return $self->types->{$name} = $self->parse("$map_name", $opt);
    }

    if(my $pointer = $8)
    {
      my $unit_type = $self->parse($unit_name, $opt);

      if($unit_type->is_record_value)
      {
        my $meta = $unit_type->meta;
        return $self->types->{$name} = $self->create_type_record(
          $meta->{size},
          $meta->{class},
        );
      }

      my $basic_name = $self->global_types->{rev}->{$unit_type->type_code};
      if($basic_name)
      {
        return $self->types->{$name} = $self->parse("$basic_name *", $opt);
      }
      else
      {
        croak "cannot make a pointer to $unit_name";
      }
    }

    if(defined (my $size = $9))
    {
      my $unit_type = $self->parse($unit_name, $opt);
      my $basic_name = $self->global_types->{rev}->{$unit_type->type_code};
      if($basic_name)
      {
        if($size ne '')
        {
          croak "array size must be larger than 0" if $size < 1;
          return $self->types->{$name} = $self->parse("$basic_name [$size]", $opt);
        }
        else
        {
          return $self->types->{$name} = $self->parse("$basic_name []", $opt);
        }
      }
      else
      {
        croak "cannot make an array of $unit_name";
      }
    }

    if($name eq 'string ro')
    {
      return $self->global_types->{basic}->{string};
    }
    elsif($name eq 'string rw')
    {
      return $self->global_types->{v2}->{string_rw} ||= $self->create_type_string(1);
    }

    return $self->types->{$name} || croak "unknown type: $unit_name";
  }

  if(defined (my $class = $10)) # object type
  {
    my $basic_name = $11 || 'opaque';
    my $basic_type = $self->parse($basic_name);
    if($basic_type->is_object_ok)
    {
      return $self->types->{$name} = $self->create_type_object(
        $basic_type->type_code,
        $class,
      );
    }
    else
    {
      croak "cannot make an object of $basic_name";
    }
  }

  croak "internal error parsing: $name";
}

1;

__END__

=pod

=encoding UTF-8

=head1 NAME

FFI::Platypus::TypeParser::Version1 - FFI Type Parser Version One

=head1 VERSION

version 0.98

=head1 SYNOPSIS

 use FFI::Platypus;
 my $ffi = FFI::Platypus->new( api => 1 );
 $ffi->type('record(Foo::Bar)' => 'foo_bar_t');
 $ffi->type('record(Foo::Bar)*' => 'foo_bar_ptr');
 $ffi->type('opaque' => 'baz_t');
 $ffi->type('bar_t*' => 'baz_ptr');

=head1 DESCRIPTION

This documents the second (version 1) type parser for L<FFI::Platypus>.
This type parser was included with L<FFI::Platypus> starting with version
C<0.91> in an experimental capability, and C<1.00> as a stable interface.
Starting with version C<1.00> the main L<FFI::Platypus> documentation
describes the version 1 API and you can refer to
L<FFI::Platypus::TypeParser::Version0> for details on the version0 API.

=head1 SEE ALSO

=over 4

=item L<FFI::Platypus>

The core L<FFI::Platypus> documentation.

=item L<FFI::Platypus::TypeParser::Version0>

The API C<0.02> type parser.

=back

=head1 AUTHOR

Author: Graham Ollis E<lt>plicease@cpan.orgE<gt>

Contributors:

Bakkiaraj Murugesan (bakkiaraj)

Dylan Cali (calid)

pipcet

Zaki Mughal (zmughal)

Fitz Elliott (felliott)

Vickenty Fesunov (vyf)

Gregor Herrmann (gregoa)

Shlomi Fish (shlomif)

Damyan Ivanov

Ilya Pavlov (Ilya33)

Petr Pisar (ppisar)

Mohammad S Anwar (MANWAR)

Håkon Hægland (hakonhagland, HAKONH)

Meredith (merrilymeredith, MHOWARD)

=head1 COPYRIGHT AND LICENSE

This software is copyright (c) 2015,2016,2017,2018,2019 by Graham Ollis.

This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.

=cut