Module: Usher::Route::Util

Defined in:
lib/usher/route/util.rb

Defined Under Namespace

Classes: Group

Class Method Summary collapse

Class Method Details

.cartesian_product!(lval, rval) ⇒ Object 



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# File 'lib/usher/route/util.rb', line 20

def self.cartesian_product!(lval, rval)
  product = []
  (lval.size * rval.size).times do |index|
    val = []
    val.push(*lval[index % lval.size])
    val.push(*rval[index / lval.size])
    product << val
  end
  lval.replace(product)
end

.expand_path(parts) ⇒ Object 



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# File 'lib/usher/route/util.rb', line 31

def self.expand_path(parts)
  if parts.is_a?(Array)
    paths = [[]]
    
    unless parts.respond_to?(:group_type)
      new_parts = Group.new(:any, nil)
      parts.each{|p| new_parts << p}
      parts = new_parts
    end
    
    case parts.group_type
    when :all
      parts.each do |p|
        cartesian_product!(paths, expand_path(p))
      end
    when :any
      parts.each do |p|
        cartesian_product!(paths, expand_path(p))
      end
      paths.unshift([])
    when :one
      cartesian_product!(paths, parts.collect do |p|
        expand_path(p)
      end)
    end
    paths.each{|p| p.compact!; p.flatten! }
    paths
  else
    [[parts]]
  end

end