++ed by:

3 PAUSE users

Flávio Soibelmann Glock


Perlito5 - a Perl5 compiler


    use Perlito5::Compiler;
    use Perlito5::JavaScript2::Emitter;
    use Perlito5::JavaScript2::Runtime;

    my $perl5_source = ' print "hello, World!\n" ';
    $Perlito5::PKG_NAME = 'main';
    $Perlito5::PROTO    = {};
    my $ast = Perlito5::Grammar::exp_stmts($perl5_source, 0);
    print Dumper $ast;
    my $js_source = Perlito5::AST::CompUnit::emit_javascript2_program([
        Perlito5::AST::CompUnit->new( name => 'main', body => Perlito5::Match::flat($ast) )
    print $js_source;

    # in the command line:

    perlito5 --help

    perlito5 -Cjs program.pl

    perlito5 -Cjava program.pl


This program reads Perl5 source code and generates native code.

The compiler options are available with the command:

    perlito5 -h


Obtaining a "perlito5.js" script that executes in the "node.js" JavaScript compiler

    # Step 1: use perlito5 to compile perlito5 to JavaScript.
    perlito5 --bootstrapping -Cjs `which perlito5` > perlito5.js

    # Step 2: ensure that PERL5LIB points to the directory where Perlito5.pm is installed.
    echo $PERL5LIB

    # Step 3: set PERL5LIB if needed.
    perldoc -l Perlito5
       # /usr/local/lib/perl5/site_perl/5.20.1/Perlito5.pm
    export PERL5LIB=/usr/local/lib/perl5/site_perl/5.20.1

    # Step 4: install nodejs if needed.

    # Step 5: this should work now:
    nodejs perlito5.js -e ' print "hello, World!\n" '
        # hello, World!

Obtaining a Perl compiler script that runs in the browser

    # Step 1: create a Perl script that loads the compiler and evaluates a string.
    #         Save this to "perlito5-browser.pl":

    use Perlito5::Compiler;
    use Perlito5::JavaScript2::Emitter;
    use Perlito5::JavaScript2::Runtime;
    sub eval_perl5 {
        eval "$_[0]; 1"
        or warn "Perl error: $@";

    # Step 2: use perlito5 to compile your "perlito5-browser.pl" script to JavaScript.

    perlito5 --bootstrapping -Cjs perlito5-browser.pl > perlito5-browser.js

    # Step 3: load the compiler in the browser;
    #         compile perl5 to javascript;
    #         eval() the javascript code.
    # Note: the default implementation for "print" will invoke console.log();
    #       you can override this by redefining p5pkg['Perlito5::IO'].print()

        <script type="text/javascript" src="perlito5-browser.js"></script>
        <script type="text/javascript">
            function hello() {
                return p5pkg.main.eval_perl5([
                    ' print "hello, World!\n" '
        <input type="button" value="Execute" onclick="hello()"/>


Flavio Soibelmann Glock <fglock@gmail.com>.




Copyright 2011-2017 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 http://dev.perl.org/licenses/artistic.html