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use v5;

package Perlito;
use Perlito5::Match;
use Perlito5::Emitter::Token;
use Perlito5::Expression;
use Perlito5::Grammar::Control;
use Perlito5::Grammar::Regex;
use Perlito5::Grammar;
use Perlito5::Javascript::Emitter;
use Perlito5::Javascript::Runtime;
use Perlito5::Javascript::CORE;
use Perlito5::Javascript::IO;
use Perlito5::Macro;
use Perlito5::Perl5::Emitter;
use Perlito5::Perl6::Emitter;
use Perlito5::Precedence;
## use Perlito5::Python::Emitter;
## use Perlito5::Ruby::Emitter;
use Perlito5::Runtime;
use Perlito5::Dumper;

my $_V5_COMPILER_NAME = 'Perlito5';
my $_V5_COMPILER_VERSION = '9.0';
my $source = '';
my $backend = '';
my $execute = 0;
my $verbose = 0;
my $expand_use = 1;

if ($verbose) {
    warn "// Perlito5 compiler";
    warn "// ARGV: @ARGV";
}

if (($ARGV[0] eq '-v') || ($ARGV[0] eq '--verbose')) {
    $verbose = 1;
    shift @ARGV;
}
while (substr($ARGV[0], 0, 2) eq '-I') {
    $lib = substr($ARGV[0], 2, 10);
    unshift @INC, $lib;
    shift @ARGV;
}
if (substr($ARGV[0], 0, 2) eq '-C') {
    $backend = substr($ARGV[0], 2, 10);
    $execute = 0;
    shift @ARGV;
    if ( $backend eq 'perl5'
       || $backend eq 'python'
       || $backend eq 'ruby'
       || $backend eq 'perl6'
       )
    {
        $expand_use = 0;
    }
}
if (substr($ARGV[0], 0, 2) eq '-B') {
    $backend = substr($ARGV[0], 2, 10);
    $execute = 1;
    shift @ARGV;
    if ( $backend eq 'perl5'
       || $backend eq 'python'
       || $backend eq 'ruby'
       || $backend eq 'js'
       )
    {
        $expand_use = 0;
    }
}
if (($ARGV[0] eq '-V') || ($ARGV[0] eq '--version')) {
    $backend = '';
    say $_V5_COMPILER_NAME, " ", $_V5_COMPILER_VERSION;
    shift @ARGV;
}
elsif (($ARGV[0] eq '-h') || ($ARGV[0] eq '--help') || ($backend eq '')) {
    $backend = '';
    say $_V5_COMPILER_NAME, " ", $_V5_COMPILER_VERSION, "
perlito5 [switches] [programfile]
switches:
-h --help
-v --verbose
-V --version
-Idirectory specify \@INC/include directory (several -I's allowed)
-Ctarget target backend: js, perl5, perl6
-Cast-perl5 emits a dump of the abstract syntax tree
-Btarget execute using the backend: js
--expand_use --noexpand_use
expand 'use' statements at compile time
-e program one line of program (omit programfile)
";
    shift @ARGV;
}
if ($ARGV[0] eq '--expand_use') {
    $expand_use = 1;
    shift @ARGV;
}
if ($ARGV[0] eq '--noexpand_use') {
    $expand_use = 0;
    shift @ARGV;
}
if ($backend && @ARGV) {
    if ($ARGV[0] eq '-e') {
        shift @ARGV;
        if ($verbose) {
            warn "// source from command line: ", $ARGV[0];
        }
        $source = shift @ARGV;
    }
    else {
        if ($verbose) {
            warn "// source from file: ", $ARGV[0];
        }
        $source = Perlito5::IO::slurp( shift @ARGV );
    }

    if ($verbose) {
        warn "// backend: ", $backend;
        warn "now parsing";
    }

    $Perlito5::PKG_NAME = 'main';
    $Perlito5::PROTO = {};

    if ( $execute ) {
        $Perlito5::EXPAND_USE = 1;
        my $ok;
        eval "package main; no strict; $source ; \$ok = 1";
        if ( !$ok ) {
            my $error = $@
                || "Unknown error";
            warn $error;
        }
    }
    else {

        # since we are generating code that will run from scratch,
        # we need to start with an empty %INC so that all modules are "used"
        %INC = ();

        # partially disable "use"
        $Perlito5::EXPAND_USE = 0;

        my $m;
        my $ok;
        eval {
            $m = Perlito5::Grammar->exp_stmts($source, 0);
            $ok = 1;
        };
        if ( !$ok
           || $m->{"to"} != length($source)
           )
        {
            my $error = $@
                || ( $m->{"to"} != length($source)
                   && "Syntax Error near " . $m->{"to"}
                   )
                || "Unknown error";
            warn $error;
        }
        else {
            my $comp_units;
            if ($expand_use) {
                $comp_units = Perlito5::Grammar::Use::add_comp_unit(Perlito5::Match::flat($m))
            }
            else {
                $comp_units = Perlito5::Match::flat($m);
            }

            $comp_units = [
                    Perlito5::AST::CompUnit->new(
                        name => 'main',
                        body => $comp_units,
                    ),
                ];

            if ($backend eq 'perl5') {
                say "# Do not edit this file - Generated by ", $_V5_COMPILER_NAME, " ", $_V5_COMPILER_VERSION;
                print Perlito5::AST::CompUnit::emit_perl5_program( $comp_units );
            }
            if ($backend eq 'perl6') {
                say "# Do not edit this file - Generated by ", $_V5_COMPILER_NAME, " ", $_V5_COMPILER_VERSION;
                print Perlito5::AST::CompUnit::emit_perl6_program( $comp_units );
            }
            if ($backend eq 'js') {
                say "// Do not edit this file - Generated by ", $_V5_COMPILER_NAME, " ", $_V5_COMPILER_VERSION;
                if ( $expand_use ) {
                    print Perlito5::Javascript::Runtime->emit_javascript();
                    print Perlito5::Javascript::CORE->emit_javascript();
                    print Perlito5::Javascript::IO->emit_javascript();
                }
                print Perlito5::AST::CompUnit::emit_javascript_program( $comp_units );
            }
            # if ($backend eq 'java') {
            # say "// Do not edit this file - Generated by ", $_V5_COMPILER_NAME, " ", $_V5_COMPILER_VERSION;
            # print Perlito5::AST::CompUnit::emit_java_program( $comp_units );
            # }
            if ($backend eq 'ast-perl5') {
                say Perlito5::Dumper::Dumper( $comp_units );
            }
            elsif ($backend eq 'ast-pretty') {
                eval 'use Data::Printer {colored=>1,class=>{expand=>"all",show_methods=>"none"}};p($comp_units);1';
                print $@;
            }
        }
    }
}

=pod

=head1 NAME

perlito5 - Perl5 compiler

=head1 SYNOPSIS

perlito5 -Cjs program.pl

=head1 DESCRIPTION

This program reads Perl5 source code and generates native code.

The compiler options are available with the command:

perlito5 -h

=head1 AUTHORS

Flavio Soibelmann Glock <fglock@gmail.com>.

=head1 SEE ALSO

L<http://www.perlito.org>

=head1 COPYRIGHT

Copyright 2011, 2012 by Flavio Soibelmann Glock and others.

This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.

See L<http://www.perl.com/perl/misc/Artistic.html>

=cut

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