From: "zverok (Victor Shepelev) via ruby-core" <ruby-core@...>
Date: 2023-02-26T13:36:30+00:00
Subject: [ruby-core:112611] [Ruby master Feature#19458] Expose HEREDOC identifier

Issue #19458 has been updated by zverok (Victor Shepelev).





> So what are you supposed to do if you wanted to include ERB in the string when you have to use ERB as the identifier?



This is a valid concern, and it doesn't have any good answer to it. 



On the other hand, 



1. the possibility of a need to have a literal text `ERB`/`HTML`/`SQL`/`SLIM` _on a separate line_ in a HEREdoc presumably written in the corresponding language is relatively low (

2. the feature of "there could be any text" was indeed introduced for a use cases you are describing, but its real usage for "tagging" strings is quite widespread; saying that it is no more significant than `"` vs `'` follows the original intention, but ignores the real usage (including in Ruby's standard library codebase, for example).

3. the usefulness of acknowledging "tagging" use in a language seems to be a least worth a discussion; whereupon the _harm_ of this idea seems to be quite low (other than the general opposition to change).



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

Feature #19458: Expose HEREDOC identifier

https://bugs.ruby-lang.org/issues/19458#change-102058



* 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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