Class: Egison::LazyArray

Inherits:
Object show all
Includes:
Enumerable
Defined in:
lib/egison/lazyarray.rb

Instance Method Summary collapse

Constructor Details

#initialize(org_enum) ⇒ LazyArray

Returns a new instance of LazyArray.



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# File 'lib/egison/lazyarray.rb', line 76

def initialize(org_enum)
  @org_enum = OrgEnum.new(org_enum)
  @cache = []
  @terminated = false
end

Instance Method Details

#+(other) ⇒ Object 



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# File 'lib/egison/lazyarray.rb', line 148

def + other
  clone.concat(other)
end

#clone ⇒ Object Also known as: dup 



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# File 'lib/egison/lazyarray.rb', line 132

def clone
  obj = super
  obj.instance_eval do
    @org_enum = @org_enum.clone
    @cache = @cache.clone
  end
  obj
end

#concat(other) ⇒ Object 



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# File 'lib/egison/lazyarray.rb', line 142

def concat other
  @org_enum.concat(other)
  @terminated = false
  self
end

#each(&block) ⇒ Object 



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# File 'lib/egison/lazyarray.rb', line 82

def each(&block)
  return to_enum unless block_given?
  @cache.each(&block)
  return if @terminated
  while true  # StopIteration will NOT be raised if `loop do ... end`
    el = @org_enum.next
    @cache.push(el)
    block.(el)
  end
rescue StopIteration => ex
  @terminated = true
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/egison/lazyarray.rb', line 115

def empty?
  return false unless @cache.empty?
  return true if @terminated
  begin
    @cache << @org_enum.next
    false
  rescue StopIteration => ex
    @terminated = true
    true
  end
end

#inspect ⇒ Object 



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# File 'lib/egison/lazyarray.rb', line 152

def inspect
  "\#<#{self.class.name}#{@terminated ? @cache.inspect : "[#{@cache.map(&:inspect).join(', ')}...]"}>"
end

#shift ⇒ Object 



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# File 'lib/egison/lazyarray.rb', line 95

def shift
  if @cache.size > 0
    @cache.shift
  elsif @terminated
    nil
  else
    begin
      @org_enum.next
    rescue StopIteration => ex
      @terminated = true
      nil
    end
  end
end

#size ⇒ Object Also known as: length 



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# File 'lib/egison/lazyarray.rb', line 127

def size
  @terminated ? @cache.size : nil
end

#unshift(*obj) ⇒ Object 



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# File 'lib/egison/lazyarray.rb', line 110

def unshift(*obj)
  @cache.unshift(*obj)
  self
end