EPP files do not appear to tokenise correctly

[glennsarti]

Originally logged by @llowder in #66

Describe the Bug

In an epp file, specifically in a templated shell script, comment highlighting breaks inside function blocks.

Ref - https://www.dropbox.com/s/jvn5aif7qd4s4it/vscode_puppet_epp_highlight.png?dl=0

Expected Behavior

Functions should tokenise like a node or class statement

Steps to Reproduce

function bar {
  # something
}

Environment

• Version [e.g. 1.27.0] N/A
• Platform [e.g. Ubuntu 18.04] N/A

Additional Context

[glennsarti]

Ref - https://puppet.com/docs/puppet/5.5/lang_write_functions_in_puppet.html

[glennsarti]

Hrmm actually, the EPP syntax highlighter is very broken :-(

[glennsarti]

This is not a function tokenising problem. The EPP language uses the same syntax file, but the puppet code is only valid within certain types of tokens e.g. <% ...... %>

This will need a new syntax file for EPP files.

[glennsarti]

@llowder Note in the example above the syntax highlighting is breaking because that is not valid Puppet code. Functions MUST have a return type (and should be namespaced)

Ref - https://puppet.com/docs/puppet/latest/lang_write_functions_in_puppet.html#syntax-of-functions

function <MODULE NAME>::<NAME>(<PARAMETER LIST>) >> <RETURN TYPE> {
  ... body of function ...
  final expression, which is the returned value of the function
}