erlang_perl's Introduction

erlang_perl

Overview

erlang_perl is a linked-in driver, API, and OTP application that embeds Perl interpreter in Erlang. Originally created to facilitate usage of Riak’s MapReduce by non-Erlang programmers, it supports runtime evaluation of Perl code, and invocation of Perl functions.

Quick Start

You must have Erlang/OTP R13B04 or later and a GNU-style build system to compile and run erlang_perl.

git clone git://github.com/yko/erlang_perl.git
make all test

Start up an Erlang shell with the path to erlang_perl included.

erl -pa path/to/erlang_perl/ebin -boot start_sasl

Start the erlang_perl application and create a Javascript VM.

1> application:start(erlang_perl).

=PROGRESS REPORT==== 6-Dec-2014::23:30:38 ===
          supervisor: {local,erlang_perl_sup}
             started: [{pid,<0.47.0>},
                       {name,cache},
                       {mfargs,{js_cache,start_link,[]}},
                       {restart_type,permanent},
                       {shutdown,2000},
                       {child_type,worker}]

=PROGRESS REPORT==== 6-Dec-2014::23:30:38 ===
         application: erlang_perl
          started_at: nonode@nohost
ok
2> {ok, Perl} = perl_driver:new().

Now you can evaluate Perl expressions, install and call your own Perl subroutines.

3> {ok, Result} = perl:eval(Perl, <<"40 + 2">>).
{ok,42}
4> {ok, Sub} = perl:define(Perl, <<"sub { my $args = shift; $args->[0] + 1; }">>).
{ok,<<"_GEN_0">>}
5> perl:call_sub(Perl, Sub, [3]).
{ok,4}

Recommend Projects