use strict;
use warnings;
use File::Basename;
use lib dirname (__FILE__);

use Scalar::Util qw(blessed);

use readline qw(mal_readline set_rl_mode);
use reader;
use printer;

# read
sub READ {
    my $str = shift;
    return reader::read_str($str);
}

# eval
sub EVAL {
    my($ast, $env) = @_;
    return $ast;
}

# print
sub PRINT {
    my $exp = shift;
    return printer::_pr_str($exp);
}

# repl
sub REP {
    my $str = shift;
    return PRINT(EVAL(READ($str), {}));
}

if (@ARGV && $ARGV[0] eq "--raw") {
    set_rl_mode("raw");
}
while (1) {
    my $line = mal_readline("user> ");
    if (! defined $line) { last; }
    do {
        local $@;
        my $ret;
        eval {
            print(REP($line), "\n");
            1;
        } or do {
            my $err = $@;
            if (defined(blessed $err) && $err->isa('Mal::BlankException')) {
		# ignore and continue
	    } else {
		chomp $err;
		print "Error: $err\n";
            }
        };
    };
}