HAML <template> in .vue files

arnaud

Hi,

I am reposting my question here from the Vue forum where nobody could help me. (Tell me if it’s too off-topic)

I wish to use HAML instead of HTML so I converted the <template> contents to HAML, installed hamljs and set the lang=haml attribute as I have seen it done for jade/pug.

Here’s what I get with the Quasar boilerplate app:

> node build/script.dev.js

 Starting dev server with "mat" theme...
 Will listen at http://localhost:8080
Build completed in 22.525s

 ERROR  Failed to compile with 1 errors                                                                                                                                              3:25:33 PM

 error  in ./src/components/Index.vue

Syntax Error:     at [...]/node_modules/hamljs/lib/haml.js:662:14

 @ ./src/components/Index.vue 9:2-238
 @ ./src/components async ^\.\/.*\.vue$
 @ ./src/router.js
 @ ./src/main.js
 @ multi ./build/hot-reload ./src/main.js

The template code was converted using html2haml v.2.0.0 and looks just fine:

<template lang='haml'>
%q-layout
  .toolbar{:slot => "header"}
    %q-toolbar-title{":padding" => "0"}
      Quasar Framework v{{$q.version}}
  /
    Replace following "div" with
    "<router-view class="layout-view">" component
    if using subRoutes
  .layout-view
    .logo-container.non-selectable.no-pointer-events
      .logo{":style" => "position"}
        %img{:src => "~assets/quasar-logo.png"}/
        %p.caption.text-center
          %span.desktop-only Move your mouse.
          %span.touch-only Touch screen and move.
</template>

For what it is worth, location 662:14 of haml.js is this:

fn = Function('locals, attrs, escape, HAML', parser.js)

arnaud

So I finally made progress when I began doubting the HAML parser. It turns out that the package (hamljs) I blindly chose does not fully support the HAML syntax. Specifically it requires the {attribute: 'value'} syntax and chokes on {:attribute => "value"} or {"attribute" => "value"}.

For some reason, the app still does not fully work, I will keep investigating and report when I figure out other limitations.

arnaud

OK, the app was not working due to the shorthand syntax for v-bind used in the .logo{":style" => "position"} element. Not being familiar with it and coming from a Ruby background, I had translated it to the supposedly equivalent style: "position" thus unknowingly breaking the binding.

s.molinari

What is your question?

Scott

arnaud

@s.molinari It is probably “Why do I get this syntax error?”

s.molinari

And you found your problem too it seems?

https://forum.vuejs.org/t/solved-haml-in-vue-files/8524

Scott

arnaud

Huh, yes as I said in my replies above. Are they not appearing on your side ? I even link back to here from the Vue forum in the hope of helping beginners who fall in the same traps.

s.molinari

Yes, they are. I just didn’t put 2 + 2 together. My bad.

Scott

wdiechmann

hi Arnaud - does the haml in templates hold out for you?

'cause I’m just dipping my toes into that pond and though I’ve yarn add --dev hamljs and I trust my HAML to be fairly straight

<template lang="haml">
  %nav{ class: "white" }
    .nav-wrapper
      %base-hamburger
</template>

I get this kind of result from my “webpacker”

webpacker | ERROR in ./app/javascript/components/_base-top_navigation.vue?vue&type=template&id=b470a524&lang=haml& (./node_modules/vue-loader/lib/loaders/templateLoader.js??vue-loader-options!./node_modules/vue-loader/lib??vue-loader-options!./app/javascript/components/_base-top_navigation.vue?vue&type=template&id=b470a524&lang=haml&)
webpacker | Module Error (from ./node_modules/vue-loader/lib/loaders/templateLoader.js):
webpacker | (Emitted value instead of an instance of Error) 
webpacker | 
webpacker |   Errors compiling template:
webpacker | 
webpacker |   Component template requires a root element, rather than just text.
webpacker | 
webpacker |   1  |  
webpacker |      |   
webpacker |   2  |  %nav{ class: "white" }
webpacker |      |  ^^^^^^^^^^^^^^^^^^^^^^
webpacker |   3  |    .nav-wrapper
webpacker |      |  ^^^^^^^^^^^^^^
webpacker |   4  |      %base-hamburger
webpacker |      |  ^^^^^^^^^^^^^^^^^^^
webpacker |   5  |  
webpacker |      |  
webpacker |   6  |

wdiechmann

Solved it myself - I’m happy to report

First of all I had to add a loader with yarn add --dev haml-plain-loader and the mention it in config/webpack/loaders/haml.js like this

module.exports = {
  test: /\.haml$/,
  use: [{
    loader: 'haml-plain-loader'
  }]
}

further I had to mention all of it in config/webpack/environment.js like this

const haml = require('./loaders/haml')
environment.loaders.prepend('haml', haml)