class RangeHash

# File lib/rangehash.rb, line 5
def [](key)
  value = find_value key
  value == :notfound ? default : value
end

# File lib/rangehash.rb, line 18
def assoc(key)
  found = find_pair(key)
  found.empty? ? nil : found.first
end

# File lib/rangehash.rb, line 32
def delete(key)
  super
end

# File lib/rangehash.rb, line 10
def fetch(key, default = nil)
  value = find_value key
  return value if value != :notfound
  return default if default != nil
  yield key if block_given?
  raise IndexError, "key " + key.to_s + " not found" if not block_given?
end

# File lib/rangehash.rb, line 23
def key?(key)
  found = find_pair(key)
  !(found.empty?)
end

# File lib/rangehash.rb, line 36
def sorted_keys
  keys.sort do |a, b|
    sort_key(a) <=> sort_key(b)
  end
end

# File lib/rangehash.rb, line 43
def find_pair(key)
  each.select {|k, v| (k == key || k === key)}
end

# File lib/rangehash.rb, line 47
def find_value(key)
  (find_pair(key).first || [nil, :notfound])[1]
end

# File lib/rangehash.rb, line 51
def sort_key(a)
  return Range === a ? a.first : a
end