2 use warnings FATAL
=> qw(all);
3 use readline qw(readline);
4 use feature
qw(switch);
7 use types
qw($nil $true $false);
11 use core qw($core_ns);
16 return reader::read_str($str);
27 my @lst = map {EVAL($_, $env)} @$ast;
28 return List->new(\@lst);
41 #print "EVAL: " . printer::_pr_str($ast) . "\n";
42 if (! ((ref $ast) =~ /^List/)) {
43 return eval_ast($ast, $env);
47 my ($a0, $a1, $a2, $a3) = @$ast;
48 given ((ref $a0) =~ /^Symbol/ ? $$a0 : $a0) {
50 my $res = EVAL($a2, $env);
51 return $env->set($$a1, $res);
54 my $let_env = Env->new($env);
55 for(my $i=0; $i < scalar(@{$a1}); $i+=2) {
56 $let_env->set(${$a1->[$i]}, EVAL($a1->[$i+1], $let_env));
58 return EVAL($a2, $let_env);
61 eval_ast($ast->slice(1, $#{$ast}-1), $env);
62 $ast = $ast->[$#{$ast}];
65 my $cond = EVAL($a1, $env);
66 if ($cond eq $nil || $cond eq $false) {
67 $ast = $a3 ? $a3 : $nil;
73 return Function->new(\&EVAL, $a2, $env, $a1);
76 my $el = eval_ast($ast, $env);
78 if ((ref $f) =~ /^Function/) {
80 $env = $f->gen_env($el->rest());
82 return &{ $f }($el->rest());
93 return printer::_pr_str($exp);
97 my $repl_env = Env->new();
100 return PRINT(EVAL(READ($str), $repl_env));
103 # core.pl: defined using perl
104 foreach my $n (%$core_ns) { $repl_env->set($n, $core_ns->{$n}); }
106 # core.mal: defined using the language itself
107 REP("(def! not (fn* (a) (if a false true)))");
110 my $line = readline("user> ");
111 if (! defined $line) { last; }
113 use autodie; # always "throw" errors
114 print(REP($line), "\n");
119 print "Error: $err\n";