From: "Dan0042 (Daniel DeLorme) via ruby-core" <ruby-core@...>
Date: 2023-07-11T13:23:35+00:00
Subject: [ruby-core:114133] [Ruby master Feature#19458] Expose HEREDOC identifier

Issue #19458 has been updated by Dan0042 (Daniel DeLorme).





What about something as KISS as possible, like just adding an instance variable to heredoc strings.

`string.instance_variable_get(:@heredoc) == :ERB`



----------------------------------------

Feature #19458: Expose HEREDOC identifier

https://bugs.ruby-lang.org/issues/19458#change-103809



* Author: joelhawksley (Joel Hawksley)

* Status: Open

* Priority: Normal

----------------------------------------

I���d like to have access to the HEREDOC identifier.



In the ViewComponent framework I help maintain, we added a method to declare a template as such:



```ruby

class Component

  erb_template <<~ERB

    <h1>Hello, <%= @name %>!</h1>

  ERB

end

```



I'd prefer to be able to write:



```ruby

class Component

  template <<~ERB

    <h1>Hello, <%= @name %>!</h1>

  ERB

end

```



And be able to see that the argument passed to `.template` was from a HEREDOC with an `ERB` identifier, which would allow me to use the correct template handler to compile the template.



I could see this being implemented:



1) As a new property of String, such as `identifier` or `heredoc_identifier`.

2) By having HEREDOCs return a subclass of String that includes an `identifier` property.



I'd be happy to work on implementing this change.



---Files--------------------------------

clipboard-202302251947-5owjc.png (16.4 KB)





-- 

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