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package types;
use strict;
use warnings FATAL => qw(all);
no if $] >= 5.018, warnings => "experimental::smartmatch";
use feature qw(switch);
use Exporter 'import';
our @EXPORT_OK = qw(_sequential_Q _equal_Q _clone
$nil $true $false _nil_Q _true_Q _false_Q
_symbol _symbol_Q _keyword _keyword_Q _list_Q _vector_Q
_hash_map _hash_map_Q _assoc_BANG _dissoc_BANG _atom_Q);
use Data::Dumper;
# General functions
sub _sequential_Q {
return _list_Q($_[0]) || _vector_Q($_[0])
}
sub _equal_Q {
my ($a, $b) = @_;
my ($ota, $otb) = (ref $a, ref $b);
if (!(($ota eq $otb) || (_sequential_Q($a) && _sequential_Q($b)))) {
return 0;
}
given (ref $a) {
when (/^Symbol/) {
return $$a eq $$b;
}
when (/^List/ || /^Vector/) {
if (! scalar(@{$a->{val}}) == scalar(@{$b->{val}})) {
return 0;
}
for (my $i=0; $i<scalar(@{$a->{val}}); $i++) {
if (! _equal_Q($a->nth($i), $b->nth($i))) {
return 0;
}
}
return 1;
}
when (/^HashMap/) {
die "TODO: Hash map comparison\n";
}
default {
return $$a eq $$b;
}
}
return 0;
}
sub _clone {
my ($obj) = @_;
given (ref $obj) {
when (/^List/) {
return List->new( [ @{$obj->{val}} ] );
}
when (/^Vector/) {
return Vector->new( [ @{$obj->{val}} ] );
}
when (/^HashMap/) {
return Vector->new( { %{$obj->{val}} } );
}
when (/^Function/) {
return Function->new_from_hash( { %{$obj} } );
}
default {
die "Clone of non-collection\n";
}
}
}
# Errors/Exceptions
{
package BlankException;
sub new { my $class = shift; bless String->new("Blank Line") => $class }
}
# Scalars
{
package Nil;
sub new { my $class = shift; my $s = 'nil'; bless \$s => $class }
}
{
package True;
sub new { my $class = shift; my $s = 'true'; bless \$s => $class }
}
{
package False;
sub new { my $class = shift; my $s = 'false'; bless \$s => $class }
}
our $nil = Nil->new();
our $true = True->new();
our $false = False->new();
sub _nil_Q { return $_[0] eq $nil }
sub _true_Q { return $_[0] eq $true }
sub _false_Q { return $_[0] eq $false }
{
package Integer;
sub new { my $class = shift; bless \$_[0] => $class }
}
{
package Symbol;
sub new { my $class = shift; bless \$_[0] => $class }
}
sub _symbol_Q { (ref $_[0]) =~ /^Symbol/ }
sub _keyword { return String->new(("\x{029e}".$_[0])); }
sub _keyword_Q { ((ref $_[0]) =~ /^String/) && ${$_[0]} =~ /^\x{029e}/; }
{
package String;
sub new { my $class = shift; bless \$_[0] => $class }
}
# Lists
{
package List;
sub new { my $class = shift; bless {'meta'=>$nil, 'val'=>$_[0]}, $class }
sub nth { $_[0]->{val}->[$_[1]]; }
#sub _val { $_[0]->{val}->[$_[1]]->{val}; } # return value of nth item
sub rest { my @arr = @{$_[0]->{val}}; List->new([@arr[1..$#arr]]); }
sub slice { my @arr = @{$_[0]->{val}}; List->new([@arr[$_[1]..$_[2]]]); }
}
sub _list_Q { (ref $_[0]) =~ /^List/ }
# Vectors
{
package Vector;
sub new { my $class = shift; bless {'meta'=>$nil, 'val'=>$_[0]}, $class }
sub nth { $_[0]->{val}->[$_[1]]; }
#sub _val { $_[0]->{val}->[$_[1]]->{val}; } # return value of nth item
sub rest { my @arr = @{$_[0]->{val}}; List->new([@arr[1..$#arr]]); }
sub slice { my @arr = @{$_[0]->{val}}; List->new([@arr[$_[1]..$_[2]]]); }
}
sub _vector_Q { (ref $_[0]) =~ /^Vector/ }
# Hash Maps
{
package HashMap;
sub new { my $class = shift; bless {'meta'=>$nil, 'val'=>$_[0]}, $class }
sub get { $_[0]->{val}->{$_[1]}; }
}
sub _hash_map {
my $hsh = {};
return _assoc_BANG($hsh, @_);
}
sub _assoc_BANG {
my $hsh = shift;
my @lst = @_;
for(my $i=0; $i<scalar(@lst); $i+=2) {
my $str = $lst[$i];
$hsh->{$$str} = $lst[$i+1];
}
return HashMap->new($hsh);
}
sub _dissoc_BANG {
my $hsh = shift;
my @lst = @_;
for(my $i=0; $i<scalar(@lst); $i++) {
my $str = $lst[$i];
delete $hsh->{$$str};
}
return HashMap->new($hsh);
}
sub _hash_map_Q { (ref $_[0]) =~ /^HashMap/ }
# Functions
{
package Function;
sub new {
my $class = shift;
my ($eval, $ast, $env, $params) = @_;
bless {'meta'=>$nil,
'eval'=>$eval,
'ast'=>$ast,
'env'=>$env,
'params'=>$params,
'ismacro'=>0}, $class
}
sub new_from_hash { my $class = shift; bless $_[0], $class }
sub gen_env {
my $self = $_[0];
return Env->new($self->{env}, $self->{params}, $_[1]);
}
sub apply {
my $self = $_[0];
return &{ $self->{eval} }($self->{ast}, gen_env($self, $_[1]));
}
}
# Atoms
{
package Atom;
sub new { my $class = shift; bless {'meta'=>$nil, 'val'=>$_[0]}, $class }
}
sub _atom_Q { (ref $_[0]) =~ /^Atom/ }
1;
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