Wrapper around Ruby's Array#index method.

location.rb

# Wrapper around Ruby's Array#index method.
# https://gist.github.com/brianmcallister/4341575
#
# value - The value in the list to search for.
# list  - The list to search through.
#
# Examples
#   
#   $list: a b c;
#   @debug location(b, $list);
#   # => 2
#
# Returns The index of the value in the list, or false if nothing is found.
def location(value, list)
  assert_type list, :List
  
  index = list.value.index(value)
  
  if index.nil?
    Sass::Script::Bool.new(false)
  else
    Sass::Script::Number.new(index + 1)
  end
end
declare :location, [:value, :list]