Method: Hash#flatten

Defined in:
lib/html_attributes/hash.rb

#flatten(sep = $,, prefix_keys = [], &block) ⇒ Object

Returns a new hash flatting the values (recursively), i.e. if a value of self is a hash again 1) the keys are build by combining the key of self (the one to access that hash value) with the keys of that hash; 2) the values are the values of that hash.

You can either specify a seperator to to build the keys joining them, or a block which gets an array of keys and returns the new key.

Examples

styles = { :padding => { :top => "8px", :right => "15px" }, :font_size => "12pt" }

styles.flatten("_")
# => { "padding_top" => "8px", "padding_right" => "15px", "font_size" => "12pt" }

styles.flatten { |keys| keys.join('-').gsub('_', '-') }
# => { "padding-top" => "8px", "padding-right" => "15px", "font-size" => "12pt" }



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# File 'lib/html_attributes/hash.rb', line 76

def flatten(sep = $,, prefix_keys = [], &block) # :nodoc:
  hash = self.class.new
  self.each do |key, value|
    prefix_keys.push(key)
    case value
    when ::Hash
      value.flatten(sep, prefix_keys, &block).each do |k, v|
        hash[k] = v
      end
    else
      hash[block_given? ? yield(prefix_keys) : prefix_keys.join(sep)] = value
    end
    prefix_keys.pop
  end
  hash
end