Class: Bundler::Thor::CoreExt::OrderedHash

Inherits:
Hash
  • Object
show all
Includes:
Enumerable
Defined in:
lib/bundler/vendor/thor/lib/thor/core_ext/ordered_hash.rb,
lib/bundler/vendor/thor/lib/thor/core_ext/ordered_hash.rb

Overview

This class is based on the Ruby 1.9 ordered hashes.

It keeps the semantics and most of the efficiency of normal hashes while also keeping track of the order in which elements were set.

Defined Under Namespace

Classes: Node

Instance Method Summary collapse

Constructor Details

#initialize ⇒ OrderedHash

Returns a new instance of OrderedHash.



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# File 'lib/bundler/vendor/thor/lib/thor/core_ext/ordered_hash.rb', line 17

def initialize
  @hash = {}
end

Instance Method Details

#[](key) ⇒ Object 



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# File 'lib/bundler/vendor/thor/lib/thor/core_ext/ordered_hash.rb', line 21

def [](key)
  @hash[key] && @hash[key].value
end

#[]=(key, value) ⇒ Object 



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# File 'lib/bundler/vendor/thor/lib/thor/core_ext/ordered_hash.rb', line 25

def []=(key, value)
  if node = @hash[key] # rubocop:disable AssignmentInCondition
    node.value = value
  else
    node = Node.new(key, value)

    if !defined?(@first) || @first.nil?
      @first = @last = node
    else
      node.prev = @last
      @last.next = node
      @last = node
    end
  end

  @hash[key] = node
  value
end

#delete(key) ⇒ Object 



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# File 'lib/bundler/vendor/thor/lib/thor/core_ext/ordered_hash.rb', line 44

def delete(key)
  if node = @hash[key] # rubocop:disable AssignmentInCondition
    prev_node = node.prev
    next_node = node.next

    next_node.prev = prev_node if next_node
    prev_node.next = next_node if prev_node

    @first = next_node if @first == node
    @last = prev_node  if @last  == node

    value = node.value
  end

  @hash.delete(key)
  value
end

#each {|[@first.key, @first.value]| ... } ⇒ Object

Yields:

  • ([@first.key, @first.value]) 


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# File 'lib/bundler/vendor/thor/lib/thor/core_ext/ordered_hash.rb', line 70

def each
  return unless defined?(@first) && @first
  yield [@first.key, @first.value]
  node = @first
  yield [node.key, node.value] while node = node.next # rubocop:disable AssignmentInCondition
  self
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/bundler/vendor/thor/lib/thor/core_ext/ordered_hash.rb', line 92

def empty?
  @hash.empty?
end

#keys ⇒ Object 



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# File 'lib/bundler/vendor/thor/lib/thor/core_ext/ordered_hash.rb', line 62

def keys
  map { |k, v| k }
end

#merge(other) ⇒ Object 



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# File 'lib/bundler/vendor/thor/lib/thor/core_ext/ordered_hash.rb', line 78

def merge(other)
  hash = self.class.new

  each do |key, value|
    hash[key] = value
  end

  other.each do |key, value|
    hash[key] = value
  end

  hash
end

#values ⇒ Object 



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# File 'lib/bundler/vendor/thor/lib/thor/core_ext/ordered_hash.rb', line 66

def values
  map { |k, v| v }
end