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Perl6.pm
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Perl6.pm
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package Java::Javap::Generator::Perl6;
use strict;
use warnings;
use Template;
use Java::Javap;
use Java::Javap::TypeCast;
use Data::Dumper;
# XXX This generator has way too much data processing in it
# It should be focussed on producing output from precomputed data.
# XXX having this info here is suboptimal
# should at least be integrated with TypeCaster
# http://perlcabal.org/syn/S02.html#Undefined_types
my @perl_builtin_undefined = qw(
Mu
Failure
Any
Cool
);
# http://perlcabal.org/syn/S02.html#Immutable_types
my @perl_builtin_immutable = qw(
Str
!Bit
Int
Num
Rat
!FatRat
Complex
Bool
Exception
Block
Seq
Range
Set
!Bag
Enum
EnumMap
Signature
Parcel
!Slicel
Capture
!Blob
!Instant
!Duration
!HardRoutine
);
# http://perlcabal.org/syn/S02.html#Mutable_types
my @perl_builtin_mutable = qw(
Iterator
!SeqIter
RangeIter
!Scalar
Array
Hash
!KeySet
!KeyBag
!KeyHash
Pair
!PairSeq
Buf
IO
Routine
Sub
Method
Submethod
!Macro
Regex
Match
!Stash
!SoftRoutine
DateTime
);
my @perl_builtin_roles = qw(
Iterable
);
my $perl_builtin_types = { map { (/^!/) ? () : ($_=>1) } (
@perl_builtin_undefined,
@perl_builtin_immutable,
@perl_builtin_mutable,
@perl_builtin_roles,
) };
if (0) { # check that types actually are built-in to current perl6
for my $t (keys %$perl_builtin_types) {
system("perl6 -e 'my $t \$v'");
}
}
sub new {
my $class = shift;
my $self = bless { @_ }, $class;
my $tt_args = {
POST_CHOMP => 1,
};
$self->tt_args_set( $tt_args );
return $self;
}
sub tt_args_set {
my $self = shift;
my $args = shift;
$self->{__TT_ARGS__} = $args;
}
sub tt_args {
my $self = shift;
return $self->{__TT_ARGS__};
}
sub generate {
my $self = shift;
my $params = shift;
my $class_file = $params->{class_file};
my $ast = $params->{ast};
my $trace_level = defined $params->{trace_level} ? $params->{trace_level} : $self->{trace_level};
$self->{type_caster} = $params->{type_caster} || Java::Javap::TypeCast->new();
$self->_cast_names( $ast );
$ast->{method_list} = $self->_get_unique_methods( $ast );
#print STDERR Dumper($ast->{method_list});
$ast->{constant_list} = [ grep { $_->{body_element} eq 'constant' } @{$ast->{contents}} ];
#warn Dumper($ast->{constant_list});
my $template = $self->_get_template( $ast );
my @prologue = $self->_get_prologue( $ast );
my $tt = Template->new( $self->tt_args );
my $tt_vars = {
ast => $ast,
gen_time => scalar localtime(),
version => $Java::Javap::VERSION,
class_file => $class_file,
type_caster=> $self->{type_caster},
javap_command=> $params->{javap_command},
prologue => \@prologue,
};
my $retval;
$tt->process( \$template, $tt_vars, \$retval )
or die "Error processing template: ".$tt->error();
return $retval;
}
sub _cast_names {
my $self = shift;
my $ast = shift;
my $type_caster = $self->{type_caster};
my $class_parent = defined $ast->{parent} ? $type_caster->cast($ast->{parent}) : '';
$ast->{cast_parent} = ($class_parent eq 'Mu') ? '' : $class_parent;
my @class_implements = map { $type_caster->cast($_) } @{ $ast->{implements} };
$ast->{cast_implements} = \@class_implements;
foreach my $element (@{$ast->{contents}}) {
if ($element->{body_element} =~ /^(method|constructor)$/) {
foreach my $arg (@{$element->{args}}) {
$arg->{perl_type_name} = $type_caster->cast($arg->{name});
}
}
$element->{type}->{perl_type_name} = $type_caster->cast($element->{type}->{name})
if ref $element->{type};
}
}
sub _get_unique_methods {
my $self = shift;
my $ast = shift;
# identify duplicate signatures resulting from TypeCast operation
# ie if both foo(javatype1) and foo(javatype2) get mapped to foo(perl_type)
# then we only want to output foo once
#print STDERR "methods: ", Dumper(@methods);
my %meth;
foreach my $element (@{$ast->{contents}}) {
next unless $element->{body_element} =~ /^(method|constructor)$/;
my $signature = $element->{name};
# discard method names containing '$' XXX why?
next if $signature =~ /\$/;
foreach my $arg (@{$element->{args}}) {
$signature .= (($arg->{array_text} =~ /Array of/) ? '@' : '$') . "$arg->{perl_type_name}, ";
}
$signature .= " --> " . ($element->{type}->{array_text} =~ /Array of/)
? 'Array'
: $element->{type}->{perl_type_name};
# print STDERR "signature: '$signature'\n" if $debug;
# de-dup via hash
$meth{$signature} = $element;
}
#die Dumper(\%meth);
my @methods = sort {
# constructors first
($b->{body_element} eq 'constructor') <=> ($a->{body_element} eq 'constructor') or
# then by method name
$a->{name} cmp $b->{name} or
# then by increasing arg count
@{$a->{args}} <=> @{$b->{args}}
} values %meth;
#print STDERR Dumper(@methods);
return \@methods;
}
sub _get_type_casts {
my $self = shift;
my $type_file = shift;
# XXX TODO
}
sub _get_prologue {
my $self = shift;
my $ast = shift;
my $type_caster = $self->{type_caster};
my $trace_level = defined $self->{trace_level} ? $self->{trace_level} : 0;
my %perl_types;
$perl_types{ $ast->{cast_parent} }{parent} = 1 if $ast->{cast_parent};
$perl_types{ $_ }{implements} = 1 for @{ $ast->{cast_implements} };
foreach my $element (@{$ast->{contents}}) {
if ($element->{body_element} =~ /^(method|constructor)/) {
foreach my $arg (@{$element->{args}}) {
$perl_types{$arg->{perl_type_name}}{arg}++;
}
}
$perl_types{ $element->{type}->{perl_type_name} }{return}++
if ref $element->{type};
}
warn "$ast->{perl_qualified_name} references types: @{[ keys %perl_types ]}\n"
if $trace_level >= 3;
for my $perl_type (keys %perl_types) {
delete $perl_types{$perl_type}
if $perl_builtin_types->{$perl_type}
# our own class name
or $perl_type eq $ast->{perl_qualified_name}
# private java class
or $perl_type =~ /\$/
# void java class
or $perl_type eq 'void'
# at the moment rakudo does not support 'Array of' so don't include the
# dependency on the class as it will just return Array at the moment.
#or $element->{type}->{array_text} =~ /Array of/;
;
}
warn "$ast->{perl_qualified_name} needs to load: @{[ keys %perl_types ]}\n"
if $trace_level >= 3;
# XXX ideally we'd use the class or role as appropriate but we don't need
# to (at least for now) because: essentially "class Foo { ... }" simply
# declares Foo as a package-ish identifier -- per pmichaud.
# So we can get away with this cheat.
# But not for all kinds of usage: 'is' and 'does' need to 'use' first
my (@decl_class, @load_class);
while ( my ($type, $usage) = each %perl_types) {
if ($usage->{parent} || $usage->{implements}) {
push @load_class, $type;
next;
}
push @decl_class, $type;
}
return (
map({ "class $_ { ... };" } sort @decl_class),
map({ "use $_;" } sort @load_class)
);
}
sub _get_template {
my $self = shift;
my $ast = shift;
my $prologue = $self->_get_template_prologue;
my $kind = $ast->{ class_or_interface };
$kind = 'interface'; # XXX only generate roles for perl6
my $method = "_get_template_for_$kind";
return $prologue . $self->$method( $ast );
}
sub _get_template_prologue {
return << 'EO_Template';
[% BLOCK file_header %]
# *** DO NOT EDIT *** CHANGES WILL BE LOST ***
# This file was automatically generated
# by java2perl6api [% version %] from the output of
# [% javap_command +%]
use v6;
[% END %]
[% BLOCK method_arg %]
[% arg.perl_type_name %] [% arg.array_text.search('Array of') ? '@' : '$' %]v[% arg_counter %], # [% arg.name +%]
[% END %]
[% BLOCK method_all_args %]
[% arg_counter = 0 %]
[% FOREACH arg IN elem.args %][% arg_counter = arg_counter + 1 %]
[% INCLUDE method_arg %]
[% END %]
[% END %]
[% BLOCK method_returns %]
[%- IF ret.name != 'void' %] --> [% ret.array_text.search('Array of') ? 'Array ' : ret.perl_type_name %]
# [% ret.array_text %] [% ret.name +%]
[% END %]
[% END %]
[% BLOCK method_whole %]
[% ast.methods.${ elem.name } > 1 ? 'multi ' : '' -%]
method [% elem.name -%]
(
[% INCLUDE method_all_args elem = elem %]
[% INCLUDE method_returns ret = elem.type %]
) { ... }
[%- IF elem.throws.size %] # throws [% elem.throws.join(", ") %][% END +%]
[% END %]
[% BLOCK constant_whole %]
method [% elem.name %] (--> [% elem.type.perl_type_name %]) is export { [% IF elem.type.perl_type_name == 'Str'
%]'[% elem.value %]';[%
ELSIF elem.type.perl_type_name == 'Int' or
elem.type.perl_type_nmae == 'Num'
%][% elem.value %][%
ELSE
%] ... [% END %] }
[% END %]
EO_Template
}
sub _get_template_for_interface {
return << 'EO_Template';
[% PROCESS file_header %]
[% FOREACH prologue_item IN prologue %]
[%+ prologue_item +%]
[% END %]
role [% ast.perl_qualified_name %]
[%- IF ast.cast_parent != '' %] does [% ast.cast_parent %] [% END -%]
[%- IF ast.cast_implements.size > 0 %] does [% ast.cast_implements.join(" does ") %] [% END -%]
{
[% FOREACH element IN ast.constant_list %]
[% NEXT IF element.name.search('\$') %]
[% INCLUDE constant_whole elem = element %]
[% END; ast.constant_list.size ? "\n" : "" %]
[% FOREACH element IN ast.method_list %]
[% INCLUDE method_whole elem = element %]
[% END %]
};
EO_Template
}
sub _get_template_for_class {
return << 'EO_Class_Template';
[% PROCESS file_header %]
[% FOREACH prologue_item IN prologue %]
[%+ prologue_item +%]
[% END %]
class [% ast.perl_qualified_name %]
[%- ast.cast_parent == '' ? '' : ' is ' %][% ast.cast_parent -%]
[%- IF ast.cast_implements.size > 0 %] does [% ast.cast_implements.join(" does ") %] [% END -%]
{
[% FOREACH element IN ast.constant_list %]
[% NEXT IF element.name.search('\$') %]
[% INCLUDE constant_whole elem = element %]
[% END; ast.constant_list.size ? "\n" : "" %]
[% FOREACH element IN ast.method_list %]
[% INCLUDE method_whole elem = element %]
[% END %]
};
EO_Class_Template
}
1;
__END__
=head1 NAME
Java::Javap::Generator::Perl6 - uses Template Toolkit to spit out Perl 6
=head1 SYNOPSIS
use Java::Javap::Generator;
my $gen = Java::Javap::Generator->get_generator( 'Perl6' );
my $output = $gen->generate(
{
$class_file => 'com.example.InterfaceName',
$ast => $tree,
$javap_command => $javap_command,
}
);
where C<$tree> is a Java::Javap abstract syntax tree (AST). Note that
parameters are named.
=head1 DESCRIPTION
This is a generator which uses TT to make output. It's templates are
strings inside this module. To change templates, subclass and override
C<_get_template_for_interface> and/or C<_get_template_for_class>.
=head1 METHODS
=over 4
=item get_generator
Call this as a class method on C<Java::Javap::Generator>. Pass it
C<Perl6> to ask it for an instance of this class.
=item generate
This is the workhorse of this module. It takes information about your
java .class file and generates Perl 6 code.
Parameters (these are named, pass them in a hashref, see below):
=over 4
=item class_file
for documentation, the name of the java .class file
=item ast
the syntax tree you got from the parser
=item javap_command
for documentation, the flags used on the javap command line
=back
Use C<Java::Javap::Grammar> to generate the ast.
Example:
my $parser = Java::Javap::Grammar->new();
my $decomp = `javap com.example.SomeInterface`;
my $tree = $parser->comp_unit( $decomp );
my $jenny = Java::Javap::Generator->get_generator( 'Perl6' );
my $output = $jenny->generate(
{
class_file => $class_file,
ast => $tree,
}
);
=item new
For use by C<Java::Javap::Generator>. You could call it directly, that
would bypass the factory.
=item tt_args_set
By default, the TT objects used internally will have this TT constructor
parameter:
{ POST_CHOMP => 1 }
Use this accessor to change the TT constructor arguments. You may call this
at any time. The C<new> method uses this accessor.
Since C<generate> makes a new TT object for each call, any changes you
make via this method will apply to subsequent calls.
=item tt_args
Accessor for getting the TT constructor arguments. Mainly for internal
use.
=back
=head1 EXPORT
Nothing, it's all OO
=head2 SEE ALSO
L<Java::Javap::Generator>
L<Java::Javap>
L<Java::Javap::Grammar>
L<java2perl6api>
=head1 AUTHOR
=head1 COPYRIGHT AND LICENSE
Copyright (C) 2007, Phil Crow
Copyright (C) 2010, Tim Bunce
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself, either Perl version 5.8.6 or,
at your option, any later version of Perl 5 you may have available.
=cut
vim: ts=8:sw=4:et