File Coverage

blib/lib/Data/Sah/DefaultValueJS.pm

Criterion	Covered	Total	%
statement	23	48	47.9
branch	0	10	0.0
condition			n/a
subroutine	8	10	80.0
pod	1	1	100.0
total	32	69	46.3

package Data::Sah::DefaultValueJS;

use 5.010001;
use strict;
use warnings;
use Log::ger;

use Data::Sah::DefaultValueCommon;
use IPC::System::Options;
use Nodejs::Util qw(get_nodejs_path);

use Exporter qw(import);

our $AUTHORITY = 'cpan:PERLANCAR'; # AUTHORITY
our $DATE = '2023-01-20'; # DATE
our $DIST = 'Data-Sah-DefaultValue'; # DIST
our $VERSION = '0.002'; # VERSION

our @EXPORT_OK = qw(gen_default_value_code);

our %SPEC;

our $Log_Default_Value_Code = $ENV{LOG_SAH_DEFAULT_VALUE_CODE} // 0;

$SPEC{gen_default_value_code} = {
    v => 1.1,
    summary => 'Generate code to set default value',
    description => <<'_',

This is mostly for testing. Normally the coercion rules will be used from
.

_
    args => {
        %Data::Sah::DefaultValueCommon::gen_default_value_code_args,
    },
    result_naked => 1,
};
sub gen_default_value_code {
    my %args = @_;

    my $rules = Data::Sah::DefaultValueCommon::get_default_value_rules(
        %args,
        compiler=>'js',
    );

    my $code;
    if (@$rules) {
        my $expr = '';
        $code = join(
            "",
            "function (res) {\n",
            (map {
                "  if (res === undefined || res === null) { res = $rules->[$_]{expr_value} }\n"
            } (reverse 0..$#{$rules})),
            "  return res\n",
            "}",
        );
    } else {
        $code = 'function (res) { return res }';
    }

    if ($Log_Default_Value_Code) {
        log_trace("Default-value code (gen args: %s): %s", \%args, $code);
    }

    return $code if $args{source};

    state $nodejs_path = get_nodejs_path();
    die "Can't find node.js in PATH" unless $nodejs_path;

    sub {
        require File::Temp;
        require JSON::MaybeXS;
        #require String::ShellQuote;

        my $data = shift;

        state $json = JSON::MaybeXS->new->allow_nonref;

        # code to be sent to nodejs
        my $src = "var default_value_code = $code;\n\n".
            "console.log(JSON.stringify(default_value_code(".
                $json->encode($data).")))";

        my ($jsh, $jsfn) = File::Temp::tempfile();
        print $jsh $src;
        close($jsh) or die "Can't write JS code to file $jsfn: $!";

        my $out = IPC::System::Options::readpipe($nodejs_path, $jsfn);
        $json->decode($out);
    };
}

1;
# ABSTRACT: Generate code to set default value

__END__