Class: RuboCop::Cop::Crystal::InterpolationInSingleQuotes

Inherits:
Base
  • Object
show all
Extended by:
AutoCorrector
Defined in:
lib/rubocop/cop/crystal/interpolation_in_single_quotes.rb

Overview

In ruby, strings deliminated with single quotes do not have interpolation applied. Crystal does not support this, so use %q literals to replicate this functionality. Only do this for strings which would be affected by interpolation, and let Style/StringLiterals handle the rest.

Examples:

# bad
'#{foo}'
'cat #{con}'

# good
%q(#{foo})
%q(cat #{con})

Constant Summary collapse

MSG = 
'Crystal does not support the use of single-quote deliminated strings to avoid interpolation.'

Instance Method Summary collapse

Instance Method Details

#on_str(node) ⇒ Object 



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# File 'lib/rubocop/cop/crystal/interpolation_in_single_quotes.rb', line 21

def on_str(node)
  # We're only interested in single-quote deliminated strings.
  return unless node.source.start_with?("'")
  # Replace the single quotes deliminating the string with double quotes, and check if the resulting ast is still the same.
  # If it is, the string doesn't have any interpolation to avoid, and we're done here.
  return if node == parse('"' + node.source[1..-2] + '"').ast

  add_offense(node) do |corrector|
    corrector.replace(node, '%q(' + node.source[1..-2] + ')')
  end
end