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mal/perl/step0_repl.pl
2014-05-10 16:03:25 -05:00

36 lines
504 B
Perl

use strict;
use warnings FATAL => qw(all);
use File::Basename;
use lib dirname (__FILE__);
use readline qw(mal_readline);
# read
sub READ {
my $str = shift;
return $str;
}
# eval
sub EVAL {
my($ast, $env) = @_;
return $ast;
}
# print
sub PRINT {
my $exp = shift;
return $exp;
}
# repl
sub REP {
my $str = shift;
return PRINT(EVAL(READ($str), {}));
}
while (1) {
my $line = mal_readline("user> ");
if (! defined $line) { last; }
print(REP($line), "\n");
}