Fw: [GENERAL] PLV8 and JS exports / referencing

Got radio silence on this question in -general, and upon reflection I think it might be a -hacker level question. I'm
notsure who actually implemented PLV8, but I think it might take someone at or near that level to answer. 

If not, sorry for the noise. Thanks!

If anyone wants to try to reproduce it, replace the snipped out bits using the contents of mustache.js from
http://github.com/janl/mustache.jsand then fiddle with my "return" line at the bottom to try to reference any function
that'sdefined in that above snipped portion (such as .render()). Here's a sample sql call to the full defined pg
function,that does work with my hacked up one that removes the factory: 

SELECT mustache('   CREATE TABLE {{{ table_name }}} (       {{{ table_name }}}_id SERIAL PRIMARY KEY       {{ #cols }}
    , {{{ def }}}       {{ /cols }}   );'   , '{           "table_name": "my_table"           , "cols": [
{ "def": "t text" }               , { "def": "i int" }           ]      }' 
);

--
Jon Erdman (aka StuckMojo)   PostgreSQL Zealot



Begin forwarded message:

Date: Wed, 5 Nov 2014 17:01:29 -0600
From: Jon Erdman <postgresql@thewickedtribe.net>
To: pgsql-general@postgresql.org
Subject: [GENERAL] PLV8  and JS exports / referencing



So, I was trying to use mustache.js in PG by defining a V8 function that imports it. Older versions worked fine, but in
newerversions they use a class factory and I can't figure out how to reference the mustache stuff that it creates.
ApparentlyI need to know how our V8 implementation does exports.  

Here's the top of mustache.js with the class factory, and my attempted reference at the bottom (the return which gives
meundefined reference). I tried various invocations and couldn't quite get it. I ended up hacking it up to remove the
factoryand change it to explicitly declare a variable to make it work, but I'd like to avoid that if possible. 

If anyone wants to try to reproduce it, replace the snipped out bits using the contents of mustache.js from
http://github.com/janl/mustache.js 

CREATE OR REPLACE FUNCTION mustache(template text, view json)   RETURNS TEXT   LANGUAGE plv8   IMMUTABLE   STRICT
AS $$

(function (global, factory) { if (typeof exports === "object" && exports) {   factory(exports); // CommonJS } else if
(typeofdefine === "function" && define.amd) {   define(['exports'], factory); // AMD } else {   factory(global.Mustache
={}); // <script> } 
}(this, function (mustache) {
 var Object_toString = Object.prototype.toString; var isArray = Array.isArray || function (object) {
...
... SNIP ...
...
}));

return mustache.render(template, view);
$$;

--
Jon Erdman (aka StuckMojo)   PostgreSQL Zealot