Class: When::Parts::Enumerator

Inherits:
Enumerator
  • Object
show all
Defined in:
lib/when_exe/parts/enumerator.rb,
lib/when_exe/parts/enumerator.rb

Overview

本ライブラリ用の Enumerator の雛形

Defined Under Namespace

Classes: Array, Integrated

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(parent, range, count_limit = nil) ⇒ Enumerator #initialize(parent, first, direction, count_limit = nil) ⇒ Enumerator

オブジェクトの生成



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# File 'lib/when_exe/parts/enumerator.rb', line 271

def initialize(*args)
  @options = self.class._options(args)
  @exdate  = @options.delete(:exdate)
  @exevent = @options.delete(:exevent)
  @delayed = @options.delete(:delayed)
  @parent, *rest = args
  _range(rest)
  _rewind
end

Instance Attribute Details

#count ⇒ Integer (readonly)

現在の繰り返し回数



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# File 'lib/when_exe/parts/enumerator.rb', line 78

def count
  @count
end

#count_limit ⇒ Integer (readonly)

最大繰り返し回数



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# File 'lib/when_exe/parts/enumerator.rb', line 74

def count_limit
  @count_limit
end

#current ⇒ Comparable

現在の要素



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# File 'lib/when_exe/parts/enumerator.rb', line 82

def current
  @current
end

#direction ⇒ Symbol (readonly)

繰り返し方向



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# File 'lib/when_exe/parts/enumerator.rb', line 70

def direction
  @direction
end

#exdate ⇒ When::Parts::GeometricComplex

除外要素



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# File 'lib/when_exe/parts/enumerator.rb', line 48

def exdate
  @exdate
end

#first ⇒ Comparable

最初の要素



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# File 'lib/when_exe/parts/enumerator.rb', line 58

def first
  @first
end

#index ⇒ Integer (readonly)

現在のインデックス



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# File 'lib/when_exe/parts/enumerator.rb', line 88

def index
  @index
end

#last ⇒ Comparable

最後の要素



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# File 'lib/when_exe/parts/enumerator.rb', line 63

def last
  @last
end

#object ⇒ Comparable

with_object メソッドで渡すインスタンス



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# File 'lib/when_exe/parts/enumerator.rb', line 93

def object
  @object
end

#options ⇒ Hash

オプション



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# File 'lib/when_exe/parts/enumerator.rb', line 43

def options
  @options
end

#parent ⇒ Comparable (readonly)

生成元オブジェクト



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# File 'lib/when_exe/parts/enumerator.rb', line 38

def parent
  @parent
end

#processed ⇒ When::Parts::GeometricComplex

処理済み要素



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# File 'lib/when_exe/parts/enumerator.rb', line 53

def processed
  @processed
end

Class Method Details

._options(args) ⇒ Object 



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# File 'lib/when_exe/parts/enumerator.rb', line 25

def self._options(args)
  options  = args[-1].kind_of?(Hash) ? args.pop.dup : {}
  options[:exdate] =
    case options[:exdate]
    when GeometricComplex ; options[:exdate].dup
    when nil ; GeometricComplex.new()
    else ; GeometricComplex.new(options[:exdate])
    end
  return options
end

Instance Method Details

#_rewind ⇒ rewind された self Also known as: rewind

巻き戻す



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# File 'lib/when_exe/parts/enumerator.rb', line 174

def _rewind
  @processed = @exdate.dup
  @count     = 0
  @current   = :first
  succ
  self
end

#each(options = {}) ⇒ rewind された self

ブロックを評価する

@param [Hash] options 以下の通り
@option options [Symbol]     :direction   方向(:forward/:reverse)
@option options [Comparable] :until       終了閾値
@option options [Integer]    :count_limit 繰り返し回数



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# File 'lib/when_exe/parts/enumerator.rb', line 106

def each(options={})
  @direction   = options[:direction] if options.key?(:direction)
  @last        = @direction == :reverse ? [options[:until], @last].compact.max :
                                          [options[:until], @last].compact.min
  @count_limit = [options[:count_limit], @count_limit].compact.min
  return self unless block_given?
  while (has_next?) do
    if @index
      yield(succ, @index)
      @index += 1
    elsif @object
      yield(succ, @object)
    else
      yield(succ)
    end
  end
  @index = @object = nil
  rewind
end

#exclude_end ⇒ Boolean

終端要素は含む



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# File 'lib/when_exe/parts/enumerator.rb', line 250

def exclude_end
  false
end

#has_next? ⇒ Boolean

次の要素があるか?



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# File 'lib/when_exe/parts/enumerator.rb', line 190

def has_next?
  return (@count_limit != 0) && !@current.nil?
end

#next ⇒ Comparable

次の要素を取り出す

Raises:

  • (StopIteration) —

    次の要素がない場合 rewind して例外を発生



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# File 'lib/when_exe/parts/enumerator.rb', line 200

def next
  return succ if has_next?
  rewind
  raise StopIteration, "Iteration Stopped"
end

#succ ⇒ Comparable

Note:

次の要素がない場合 rewind や、StopIteration例外発生は行わない

次の要素を取り出す



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# File 'lib/when_exe/parts/enumerator.rb', line 216

def succ
  value = @current
  if @count_limit.kind_of?(Numeric) && @count >= @count_limit
    @current = nil
  else
    loop do
      @current = _succ
      break unless @current
      next if (@current == :next)
      @current = GeometricComplex.new(@current, @duration) if @duration
      next if _exclude(@current)
      case @direction
      when :reverse
        next if @current > @first
        @current = nil if @last && @current < @last
        break
      else
        next if @current < @first
        @current = nil if @last && @current > @last
        break
      end
    end
    @count += 1
    _exclude(@current) if @current
  end
  @delayed && value.respond_to?(:apply_delayed_options) ?
    value.apply_delayed_options(@delayed)               :
    value
end

#with_index(offset = 0, &block) ⇒ When::Parts:Enumerator

index をブロックに渡して評価する



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# File 'lib/when_exe/parts/enumerator.rb', line 135

def with_index(offset=0, &block)
  if block_given?
    @index = offset||@count
    return each(block)
  else
    copy = _copy
    copy.object = nil
    copy.index  = offset||@count
    return copy
  end
end

#with_object(object, &block) ⇒ When::Parts:Enumerator

index をブロックに渡して評価する



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# File 'lib/when_exe/parts/enumerator.rb', line 156

def with_object(object, &block)
  if block_given?
    @object = object
    each(block)
    return object
  else
    copy = _copy
    copy.object = object
    copy.index  = nil
    return copy
  end
end