- set ismacro property on function
- step9_interop
+ - convert returned data to mal data
+ - recursive, similar to pr_str
- stepA_more
- core module:
- apply, map functions: should not directly call EVAL, which
requires the function object to be runnable
- readline
+ - nil?, true?, false?
- EVAL:
- try*/catch*: for normal exceptions, extracts string
otherwise extracts full value
- set and print *host-language*
+ - define cond and or macros using REP/RE
- Extra defintions needed for self-hosting
- - types module:
- - symbol?, nil?, true?, false?, sequential? (if not already)
- - first, rest
- - define cond and or macros using REP/RE
+ - core module:
+ - symbol?, sequential? (if not already)
- Other misc:
- conj function
use Exporter 'import';
our @EXPORT_OK = qw($core_ns);
-use types qw(_sequential_Q _equal_Q $nil $true $false _list_Q);
+use readline qw(readline);
+use types qw(_sequential_Q _equal_Q $nil $true $false
+ _symbol_Q _nil_Q _true_Q _false_Q _list_Q
+ _hash_map _hash_map_Q _assoc_BANG _dissoc_BANG);
use reader qw(read_str);
use printer qw(_pr_str);
return $nil
}
+sub mal_readline {
+ my $line = readline(${$_[0]});
+ return $line ? String->new($line) : $nil;
+}
+
sub slurp {
my ($fname) = ${$_[0]};
open my $F, '<', $fname or die "error opening '$fname'";
String->new($data)
}
+# Hash Map functions
+
+sub assoc {
+ my $src_hsh = shift;
+ my $new_hsh = { %$src_hsh };
+ return _assoc_BANG($new_hsh, @_);
+}
+
+sub dissoc {
+ my $src_hsh = shift;
+ my $new_hsh = { %$src_hsh };
+ return _dissoc_BANG($new_hsh, @_);
+}
-# List functions
+
+sub get {
+ my ($hsh, $key) = @_;
+ return $nil if $hsh eq $nil;
+ return exists $hsh->{$$key} ? $hsh->{$$key} : $nil;
+}
+
+sub contains_Q {
+ my ($hsh, $key) = @_;
+ return $nil if $hsh eq $false;
+ return (exists $hsh->{$$key}) ? $true : $false;
+}
+
+sub mal_keys {
+ my @ks = map { String->new($_) } keys %{$_[0]};
+ return List->new(\@ks);
+}
+
+sub mal_vals {
+ my @vs = values %{$_[0]};
+ return List->new(\@vs);
+}
+
+
+# Sequence functions
sub cons {
my ($a, $b) = @_;
sub rest { return $_[0]->rest(); }
+sub apply {
+ my @all_args = @{$_[0]};
+ my $f = $all_args[0];
+ my @apply_args = @all_args[1..$#all_args];
+ my @args = @apply_args[0..$#apply_args-1];
+ push @args, @{$apply_args[$#apply_args]};
+ if ((ref $f) =~ /^Function/) {
+ return $f->apply(List->new(\@args));
+ } else {
+ return &{ $f }(List->new(\@args));
+ }
+}
+
+sub mal_map {
+ my $f = shift;
+ my @arr;
+ if ((ref $f) =~ /^Function/) {
+ @arr = map { $f->apply(List->new([$_])) } @{$_[0]};
+ } else {
+ @arr = map { &{ $f}(List->new([$_])) } @{$_[0]};
+ }
+ return List->new(\@arr);
+}
+
our $core_ns = {
'=' => sub { _equal_Q($_[0][0], $_[0][1]) ? $true : $false },
+ 'throw' => sub { die $_[0][0] },
+ 'nil?' => sub { _nil_Q($_[0][0]) ? $true : $false },
+ 'true?' => sub { _true_Q($_[0][0]) ? $true : $false },
+ 'false?' => sub { _false_Q($_[0][0]) ? $true : $false },
+ 'symbol?' => sub { _symbol_Q($_[0][0]) ? $true : $false },
'pr-str' => sub { pr_str($_[0]) },
'str' => sub { str($_[0]) },
'prn' => sub { prn($_[0]) },
'println' => sub { println($_[0]) },
+ 'readline' => sub { mal_readline($_[0][0]) },
'read-string' => sub { read_str(${$_[0][0]}) },
- 'slurp' => sub { slurp($_[0][0]) },
+ 'slurp' => sub { slurp($_[0][0]) },
'<' => sub { ${$_[0][0]} < ${$_[0][1]} ? $true : $false },
'<=' => sub { ${$_[0][0]} <= ${$_[0][1]} ? $true : $false },
'>' => sub { ${$_[0][0]} > ${$_[0][1]} ? $true : $false },
'list' => sub { $_[0] },
'list?' => sub { _list_Q($_[0][0]) ? $true : $false },
-
+ 'hash-map' => sub { _hash_map(@{$_[0]}) },
+ 'map?' => sub { _hash_map_Q($_[0][0]) ? $true : $false },
+ 'assoc' => sub { assoc(@{$_[0]}) },
+ 'dissoc' => sub { dissoc(@{$_[0]}) },
+ 'get' => sub { get($_[0][0],$_[0][1]) },
+ 'contains?' => sub { contains_Q($_[0][0],$_[0][1]) },
+ 'keys' => sub { mal_keys(@{$_[0]}) },
+ 'vals' => sub { mal_vals(@{$_[0]}) },
+
+ 'sequential?' => sub { _sequential_Q($_[0][0]) ? $true : $false },
'nth' => sub { nth($_[0][0], ${$_[0][1]}) },
'first' => sub { first($_[0][0]) },
'rest' => sub { rest($_[0][0]) },
'concat' => sub { concat(@{$_[0]}) },
'empty?' => sub { scalar(@{$_[0][0]}) == 0 ? $true : $false },
'count' => sub { Integer->new(scalar(@{$_[0][0]})) },
+ 'apply' => sub { apply($_[0]) },
+ 'map' => sub { mal_map($_[0][0], $_[0][1]) },
};
1;
sub get {
my ($self, $key) = @_;
my $env = $self->find($key);
- die "'" . $key . "' not found" unless $env;
+ die "'" . $key . "' not found\n" unless $env;
return $env->{$key};
}
}
use Exporter 'import';
our @EXPORT_OK = qw( read_str );
-use types qw($nil $true $false);
+use types qw($nil $true $false _hash_map);
use Data::Dumper;
} elsif ($class eq 'Vector') {
return Vector->new(\@lst);
} else {
- my $hsh = {};
- for(my $i=0; $i<$#lst; $i+=2) {
- my $str = $lst[$i];
- $hsh->{$$str} = $lst[$i+1];
- }
- return HashMap->new($hsh);
+ return _hash_map(@lst);
}
}
--- /dev/null
+use strict;
+use warnings FATAL => qw(all);
+use readline qw(readline);
+use feature qw(switch);
+use Data::Dumper;
+
+use types qw($nil $true $false _sequential_Q _symbol_Q _list_Q);
+use reader;
+use printer;
+use env;
+use core qw($core_ns);
+use interop qw(pl_to_mal);
+
+# read
+sub READ {
+ my $str = shift;
+ return reader::read_str($str);
+}
+
+# eval
+sub is_pair {
+ my ($x) = @_;
+ return _sequential_Q($x) && scalar(@$x) > 0;
+}
+
+sub quasiquote {
+ my ($ast) = @_;
+ if (!is_pair($ast)) {
+ return List->new([Symbol->new("quote"), $ast]);
+ } elsif (_symbol_Q($ast->[0]) && ${$ast->[0]} eq 'unquote') {
+ return $ast->[1];
+ } elsif (is_pair($ast->[0]) && _symbol_Q($ast->[0][0]) &&
+ ${$ast->[0][0]} eq 'splice-unquote') {
+ return List->new([Symbol->new("concat"),
+ $ast->[0][1],
+ quasiquote($ast->rest())]);
+ } else {
+ return List->new([Symbol->new("cons"),
+ quasiquote($ast->[0]),
+ quasiquote($ast->rest())]);
+ }
+}
+
+sub is_macro_call {
+ my ($ast, $env) = @_;
+ if (_list_Q($ast) &&
+ _symbol_Q($ast->[0]) &&
+ $env->find(${$ast->[0]})) {
+ my ($f) = $env->get(${$ast->[0]});
+ if ((ref $f) =~ /^Function/) {
+ return $f->{ismacro};
+ }
+ }
+ return 0;
+}
+
+sub macroexpand {
+ my ($ast, $env) = @_;
+ while (is_macro_call($ast, $env)) {
+ my $mac = $env->get(${$ast->[0]});
+ $ast = $mac->apply($ast->rest());
+ }
+ return $ast;
+}
+
+
+sub eval_ast {
+ my($ast, $env) = @_;
+ given (ref $ast) {
+ when (/^Symbol/) {
+ $env->get($$ast);
+ }
+ when (/^List/) {
+ my @lst = map {EVAL($_, $env)} @$ast;
+ return List->new(\@lst);
+ }
+ default {
+ return $ast;
+ }
+ }
+}
+
+sub EVAL {
+ my($ast, $env) = @_;
+
+ while (1) {
+
+ #print "EVAL: " . printer::_pr_str($ast) . "\n";
+ if (! _list_Q($ast)) {
+ return eval_ast($ast, $env);
+ }
+
+ # apply list
+ $ast = macroexpand($ast, $env);
+ if (! _list_Q($ast)) { return $ast; }
+
+ my ($a0, $a1, $a2, $a3) = @$ast;
+ given ((ref $a0) =~ /^Symbol/ ? $$a0 : $a0) {
+ when (/^def!$/) {
+ my $res = EVAL($a2, $env);
+ return $env->set($$a1, $res);
+ }
+ when (/^let\*$/) {
+ my $let_env = Env->new($env);
+ for(my $i=0; $i < scalar(@{$a1}); $i+=2) {
+ $let_env->set(${$a1->[$i]}, EVAL($a1->[$i+1], $let_env));
+ }
+ return EVAL($a2, $let_env);
+ }
+ when (/^quote$/) {
+ return $a1;
+ }
+ when (/^quasiquote$/) {
+ return EVAL(quasiquote($a1), $env);
+ }
+ when (/^defmacro!$/) {
+ my $func = EVAL($a2, $env);
+ $func->{ismacro} = 1;
+ return $env->set($$a1, $func);
+ }
+ when (/^macroexpand$/) {
+ return macroexpand($a1, $env);
+ }
+ when (/^pl\*$/) {
+ return pl_to_mal(eval(${$a1}));
+ }
+ when (/^try\*$/) {
+ eval {
+ use autodie; # always "throw" errors
+ return EVAL($a1, $env);
+ };
+ if (my $err = $@) {
+ if ($a2 && ${$a2->[0]} eq "catch\*") {
+ my $exc;
+ if (ref $err) {
+ $exc = $err;
+ } else {
+ $exc = String->new(substr $err, 0, -1);
+ }
+ return EVAL($a2->[2], Env->new($env,
+ List->new([$a2->[1]]),
+ List->new([$exc])));
+ } else {
+ die $err;
+ }
+ }
+ }
+ when (/^do$/) {
+ eval_ast($ast->slice(1, $#{$ast}-1), $env);
+ $ast = $ast->[$#{$ast}];
+ }
+ when (/^if$/) {
+ my $cond = EVAL($a1, $env);
+ if ($cond eq $nil || $cond eq $false) {
+ $ast = $a3 ? $a3 : $nil;
+ } else {
+ $ast = $a2;
+ }
+ }
+ when (/^fn\*$/) {
+ return Function->new(\&EVAL, $a2, $env, $a1);
+ }
+ default {
+ my $el = eval_ast($ast, $env);
+ my $f = $el->[0];
+ if ((ref $f) =~ /^Function/) {
+ $ast = $f->{ast};
+ $env = $f->gen_env($el->rest());
+ } else {
+ return &{ $f }($el->rest());
+ }
+ }
+ }
+
+ } # TCO while loop
+}
+
+# print
+sub PRINT {
+ my $exp = shift;
+ return printer::_pr_str($exp);
+}
+
+# repl
+my $repl_env = Env->new();
+sub REP {
+ my $str = shift;
+ return PRINT(EVAL(READ($str), $repl_env));
+}
+
+# core.pl: defined using perl
+foreach my $n (%$core_ns) { $repl_env->set($n, $core_ns->{$n}); }
+$repl_env->set('eval', sub { EVAL($_[0][0], $repl_env); });
+my @_argv = map {String->new($_)} @ARGV[1..$#ARGV];
+$repl_env->set('*ARGV*', List->new(\@_argv));
+
+# core.mal: defined using the language itself
+REP("(def! not (fn* (a) (if a false true)))");
+REP("(def! load-file (fn* (f) (eval (read-string (str \"(do \" (slurp f) \")\")))))");
+
+if ($#ARGV > 0) {
+ REP("(load-file \"" . $ARGV[0] . "\")");
+ exit 0;
+}
+while (1) {
+ my $line = readline("user> ");
+ if (! defined $line) { last; }
+ eval {
+ use autodie; # always "throw" errors
+ print(REP($line), "\n");
+ 1;
+ };
+ if (my $err = $@) {
+ chomp $err;
+ print "Error: $err\n";
+ }
+}
use Exporter 'import';
our @EXPORT_OK = qw(_sequential_Q _equal_Q
$nil $true $false
- _symbol_Q _list_Q);
+ _symbol_Q _nil_Q _true_Q _false_Q _list_Q
+ _hash_map _hash_map_Q _assoc_BANG _dissoc_BANG);
use Data::Dumper;
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 }
sub new { my $class = shift; bless $_[0], $class }
}
+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
;;
;; Testing try*/catch*
-(try* (abc 1 2) (catch* exc (prn exc))))
-; "'abc' not found"
+(try* (abc 1 2) (catch* exc (prn "exc is:" exc))))
+; "exc is:" "'abc' not found"
;=>nil
-;;;TODO: fix so long lines don't trigger ANSI escape codes
-;;;(try* (throw {"data" "foo"}) (catch* exc (do (prn "exc is:" exc) 7)))
-;;;; "exc is:" {"data" "foo"}
-;;;;=>7
+;;;TODO: fix so long lines don't trigger ANSI escape codes ;;;(try*
+(throw {"data" "foo"}) (catch* exc (do (prn "exc is:" exc) 7))) ;;;;
+"exc is:" {"data" "foo"} ;;;;=>7
+
+(try* (throw {"data" "foo"}) (catch* exc (do (prn "err:" exc) 7)))
+; "err:" {"data" "foo"}
+;=>7
(try* (throw "my exception") (catch* exc (do (prn "exc:" exc) 7)))
; "exc:" "my exception"
HCoop / jackhill / mal.git / commitdiff