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# File 'lib/active_support/vendor/i18n-0.4.1/i18n/backend/cascade.rb', line 38
def lookup(locale, key, scope = [], options = {})
return super unless cascade = options[:cascade]
separator = options[:separator] || I18n.default_separator
skip_root = cascade.has_key?(:skip_root) ? cascade[:skip_root] : true
step = cascade[:step]
keys = I18n.normalize_keys(nil, key, nil, separator)
offset = options[:cascade][:offset] || keys.length
scope = I18n.normalize_keys(nil, nil, scope, separator) + keys
key = scope.slice!(-offset, offset).join(separator)
begin
result = super
return result unless result.nil?
end while !scope.empty? && scope.slice!(-step, step) && (!scope.empty? || !skip_root)
end
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