Where is the template parsing logic?

[Qwertyzw]

I can't find decent documentation for it anywhere.

Looked under here https://nodebb.readthedocs.io/en/latest/themes/templates.html,
here https://github.com/NodeBB/NodeBB/blob/master/src/middleware/render.js,

All I found was the logic that injects partial templates into each other here https://github.com/NodeBB/NodeBB/blob/master/src/meta/templates.js

But as far as the parsing goes I'm clueless.

What I'm trying to accomplish:

• access parent category's siblings within a .tpl file.
• understand how the pathing logic (eg: {../name}) works
• If the pathing logic is interchangeable with the basic (only?) true/false logic (eg <!-- IF children.length --> ...)
• Once all the questions above are answered, Extend the parsing logic.
• Find a right place to ask these kind of questions.

Thanks

[phit]

not sure about most of your questions but the templating engine can be found here https://github.com/psychobunny/templates.js

[jiangcaiyang]

@Qwertyzw Maybe one could not parse it's parent and siblings within a tpl file.:rage1:

[julian]

The way the template engine works is it takes the data sent to it (handled by NodeBB). You can see this data by navigating to the corresponding /api route. For example, the api route for this topic: https://community.nodebb.org/api/topic/10163/where-is-the-template-parsing-logic

From inside of a <!-- BEGIN -->..<!-- END --> you can reference values in that array object with ../.

e.g.

{
  foobar: [
    {
      baz: 'quux'
    },
    {
      baz: 'test'
    }
  ]
}

and...

<!-- BEGIN foobar -->
this is the value of baz: {../baz}
<!-- END foobar -->

[Qwertyzw]

Thanks guys. That covers mostly everything for now.

[Giggiux]

@julian what if I'd like to create an helper for the template system in my plugin?

This is what's written on GitHub:

templates.registerHelper('print_is_human', function(data, iterator, numblocks) {
    return (data.isHuman) ? "Is human" : "Isn't human";
});

<!-- BEGIN animals -->
{function.print_is_human}
<!-- END animals -->

prints out:

Isn't human
Isn't human
Is human

So I just do something like

res.registerHelper('myhepler', function(data, iterator, numblocks) {
    return (data.myValue) ? "It is my value" : "It isn't my value";
});


<!-- BEGIN values -->
{function.myhelper}
<!-- END values -->

?

[Qwertyzw]

@julian This is what I was looking for for the most part. I think it would be helpful to put this example in the documentation. I just went through the page I linked and found what I was looking for but only after seeing this example.

[Qwertyzw]

@jiangcaiyang I meant to say siblings, the (misleading?) path syntax '../' lead me to saying parent's siblings. I don't mean parsing them either, I only intend to reference them.