Class: Twig::Runtime::LoopIterator

Inherits:
Object
  • Object
show all
Defined in:
lib/twig/runtime/loop_iterator.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(seq) ⇒ LoopIterator

Returns a new instance of LoopIterator.



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# File 'lib/twig/runtime/loop_iterator.rb', line 8

def initialize(seq)
  @seq = Runtime::EnumerableHash.from(seq).to_enum
  @index0 = 0
  @previous = nil
  @next = nil
end

Instance Attribute Details

#index0 ⇒ Object (readonly)

Returns the value of attribute index0.



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# File 'lib/twig/runtime/loop_iterator.rb', line 6

def index0
  @index0
end

#next ⇒ Object (readonly)

Returns the value of attribute next.



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# File 'lib/twig/runtime/loop_iterator.rb', line 6

def next
  @next
end

#previous ⇒ Object (readonly)

Returns the value of attribute previous.



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# File 'lib/twig/runtime/loop_iterator.rb', line 6

def previous
  @previous
end

Instance Method Details

#each ⇒ Object 



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# File 'lib/twig/runtime/loop_iterator.rb', line 15

def each(&)
  @index0 = 0

  loop do
    current = @seq.next

    begin
      @next = @seq.peek
    rescue StopIteration
      @next = nil
    end

    yield current[0], current[1]
    @index0 += 1
    @previous = current
  rescue StopIteration
    break
  end
end

#first ⇒ Object 



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# File 'lib/twig/runtime/loop_iterator.rb', line 35

def first
  @index0.zero?
end

#index ⇒ Object 



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# File 'lib/twig/runtime/loop_iterator.rb', line 47

def index
  @index0 + 1
end

#last ⇒ Object 



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# File 'lib/twig/runtime/loop_iterator.rb', line 39

def last
  revindex0.zero? || length.zero?
end

#length ⇒ Object 



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# File 'lib/twig/runtime/loop_iterator.rb', line 43

def length
  @length ||= @seq.count
end

#revindex ⇒ Object 



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# File 'lib/twig/runtime/loop_iterator.rb', line 55

def revindex
  revindex0 + 1
end

#revindex0 ⇒ Object 



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# File 'lib/twig/runtime/loop_iterator.rb', line 51

def revindex0
  [0, length - index].max
end