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PERLANCAR / Language-Expr-0.29 / lib / Language / Expr / JS.pm 

            

              
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package Language::Expr::JS;
our $DATE = '2016-07-03'; # DATE
our $VERSION = '0.29'; # VERSION
use 5.010;
use strict;
use warnings;
#use Log::Any qw($log);
require Exporter;
our @ISA       = qw(Exporter);
our @EXPORT_OK = qw(eval_expr_js);
sub _comment {
    my $str = shift;
    $str =~ s!^!// !g;
    $str;
}
sub eval_expr_js {
    require File::Temp;
    require JSON::MaybeXS;
    require Language::Expr::Compiler::js;
    require Nodejs::Util;
    my ($expr, $opts) = @_;
    $opts //= {};
    state $default_jsc = Language::Expr::Compiler::js->new;
    state $json = JSON::MaybeXS->new->allow_nonref;
    my $jsc = $opts->{js_compiler} // $default_jsc;
    # code to be sent to nodejs
    my $src = join(
        "",
        _comment("expr: $expr\n"),
        ($opts->{vars} ?
             _comment("declare vars\n") . join("", map { "let $_ = ".$json->encode($opts->{vars}{$_}).";\n" } sort keys %{$opts->{vars}})
             : ""),
        "console.log(JSON.stringify(",
        $jsc->compile($expr),
        "))",
    );
    my ($jsh, $jsfn) = File::Temp::tempfile();
    print $jsh $src;
    close($jsh) or die "Can't write JS code to file $jsfn: $!";
    my ($stdout, $stderr);
    Nodejs::Util::system_nodejs(
        {
            harmony_scoping => 1,
            capture_stdout => \$stdout,
            capture_stderr => \$stderr
        },
        $jsfn,
    );
    die "nodejs exists non-zero (".($? >> 8)."): $stderr" if $?;
    if ($stdout eq "undefined\n") {
        return undef;
    }
    $json->decode($stdout);
}
1;
# ABSTRACT: Evaluate Expr JavaScript code
__END__
=pod
=encoding UTF-8
=head1 NAME
Language::Expr::JS - Evaluate Expr JavaScript code
=head1 VERSION
This document describes version 0.29 of Language::Expr::JS (from Perl distribution Language-Expr), released on 2016-07-03.
=head1 SYNOPSIS
 use Language::Expr::JS qw(eval_expr_js);
 say eval_expr_js('"a" . "b"'); # "ab"
=head1 DESCRIPTION
=head1 FUNCTIONS
None exported by default.
=head2 eval_expr_js($expr) => str
Compile $expr to JavaScript code, then run the JavaScript code using Node.js,
and return the result.
=head1 HOMEPAGE
Please visit the project's homepage at L<https://metacpan.org/release/Language-Expr>.
=head1 SOURCE
Source repository is at L<https://github.com/sharyanto/perl-Language-Expr>.
=head1 BUGS
Please report any bugs or feature requests on the bugtracker website L<https://rt.cpan.org/Public/Dist/Display.html?Name=Language-Expr>
When submitting a bug or request, please include a test-file or a
patch to an existing test-file that illustrates the bug or desired
feature.
=head1 AUTHOR
perlancar <perlancar@cpan.org>
=head1 COPYRIGHT AND LICENSE
This software is copyright (c) 2016 by perlancar@cpan.org.
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.
=cut