class RuboCop::Cop::Style::VariableInterpolation

“Let’s go to the #{@store}”
/check #{$pattern}/
“His name is #{$name}”
# good
“Let’s go to the #@store”
/check #$pattern/
“His name is #$name”
# bad
@example
This cop checks for variable interpolation (like “#@ivar”).

def autocorrect(node) 

def autocorrect(node)
  lambda do |corrector|
    corrector.replace(node.source_range, "{#{node.source}}")
  end
end

def check_for_interpolation(node) 

def check_for_interpolation(node)
  var_nodes(node.children).each do |var_node|
    add_offense(var_node)
  end
end

def message(node) 

def message(node)
  format(MSG, variable: node.source)
end

def on_dstr(node) 

def on_dstr(node)
  check_for_interpolation(node)
end

def on_regexp(node) 

def on_regexp(node)
  check_for_interpolation(node)
end

def on_xstr(node) 

def on_xstr(node)
  check_for_interpolation(node)
end

def var_nodes(nodes) 

def var_nodes(nodes)
  nodes.select { |n| n.variable? || n.reference? }
end