mirror of
https://github.com/kanaka/mal.git
synced 2024-10-27 06:40:14 +03:00
110 lines
2.6 KiB
Perl
110 lines
2.6 KiB
Perl
#!/usr/bin/perl
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use strict;
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use warnings;
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use File::Basename 'dirname';
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use lib dirname(__FILE__);
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use English '-no_match_vars';
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use List::Util qw(pairs pairmap);
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use Readline qw(mal_readline set_rl_mode);
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use Types qw(nil false);
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use Reader qw(read_str);
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use Printer qw(pr_str);
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use Env;
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# read
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sub READ {
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my $str = shift;
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return read_str($str);
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}
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# eval
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my %special_forms = (
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'def!' => \&special_def,
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'let*' => \&special_let,
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);
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sub EVAL {
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my ( $ast, $env ) = @_;
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my $dbgeval = $env->get('DEBUG-EVAL');
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if ( $dbgeval
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and not $dbgeval->isa('Mal::Nil')
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and not $dbgeval->isa('Mal::False') )
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{
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print 'EVAL: ', pr_str($ast), "\n" or die $ERRNO;
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}
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if ( $ast->isa('Mal::Symbol') ) {
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return $env->get( ${$ast} ) // die "'${$ast}' not found\n";
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}
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if ( $ast->isa('Mal::Vector') ) {
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return Mal::Vector->new( [ map { EVAL( $_, $env ) } @{$ast} ] );
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}
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if ( $ast->isa('Mal::HashMap') ) {
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return Mal::HashMap->new(
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{ pairmap { $a => EVAL( $b, $env ) } %{$ast} } );
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}
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if ( $ast->isa('Mal::List') and @{$ast} ) {
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my ( $a0, @args ) = @{$ast};
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if ( $a0->isa('Mal::Symbol') and my $sf = $special_forms{ ${$a0} } ) {
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return $sf->( $env, @args );
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}
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my $f = EVAL( $a0, $env );
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return $f->( map { EVAL( $_, $env ) } @args );
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}
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return $ast;
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}
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sub special_def {
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my ( $env, $sym, $val ) = @_;
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return $env->set( ${$sym}, EVAL( $val, $env ) );
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}
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sub special_let {
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my ( $env, $bindings, $body ) = @_;
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my $let_env = Env->new($env);
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foreach my $pair ( pairs @{$bindings} ) {
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my ( $k, $v ) = @{$pair};
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$let_env->set( ${$k}, EVAL( $v, $let_env ) );
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}
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return EVAL( $body, $let_env );
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}
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# print
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sub PRINT {
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my $exp = shift;
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return pr_str($exp);
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}
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# repl
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my $repl_env = Env->new();
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$repl_env->set( q{+}, sub { Mal::Integer->new( ${ $_[0] } + ${ $_[1] } ) } );
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$repl_env->set( q{-}, sub { Mal::Integer->new( ${ $_[0] } - ${ $_[1] } ) } );
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$repl_env->set( q{*}, sub { Mal::Integer->new( ${ $_[0] } * ${ $_[1] } ) } );
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$repl_env->set( q{/}, sub { Mal::Integer->new( ${ $_[0] } / ${ $_[1] } ) } );
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sub REP {
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my $str = shift;
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return PRINT( EVAL( READ($str), $repl_env ) );
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}
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# Command line arguments
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if ( $ARGV[0] eq '--raw' ) {
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set_rl_mode('raw');
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shift @ARGV;
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}
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while ( defined( my $line = mal_readline('user> ') ) ) {
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eval {
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print REP($line), "\n" or die $ERRNO;
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1;
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} or do {
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my $err = $EVAL_ERROR;
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print 'Error: ', $err or die $ERRNO;
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};
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}
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