Go To Definition Lookup for String Literal

[mario-amazing]

I have checked that this feature is not already implemented

• This feature does not exist

Use case

In Ruby, class names are often represented as strings in mappings and configurations:

WORKERS_MAPPING = {
  ....Worker => 'Another::Worker',
  #.  ...
}

'User', "Go to Definition" works on direct class references (User) but not on string literals ('User'). When invoking "Go to Definition" on 'User', it should navigate to the User class definition.

Description

Ruby LSP should recognize string literals containing class/module names and allow navigating to their definitions. When a user invokes "Go to Definition" on a string literal:

1. LSP checks if the string content is a valid class/module name
2. Searches for that class definition in the workspace
3. If found, navigates to the definition
4. If not found, shows standard string behavior

Implementation

In lib/ruby_lsp/requests/definition.rb:

1. On definition request, check the AST node type
2. If it's a string literal, extract its value
3. Check if the value is a valid constant name (e.g., User, Communication::User)
4. If yes, resolve the class/module using Object.const_get or Ruby LSP's index
5. Return the position of the found class definition