Class: PodArray

Inherits:
Array
  • Object
show all
Defined in:
lib/podcsv.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(args) ⇒ PodArray

PARSER_DEFAULT = lambda{|s,opt| CSV.parse_line(s,opt)} PARSER_DEFAULT = lambda{|s| CSV.parse_line(s,@opt)} PARSER_DEFAULT = lambda{|s| CSV.parse_line(s,@opt.to_h)}



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# File 'lib/podcsv.rb', line 13

def initialize(args)
  super

  # we can also distinguish which are cached by the type of elements
  # (String or not).
  # But the advantage of having cache structure is that
  # we can know which are the cached elements without traversing
  # whole array.
  #
  @_cache = {}
  if args.class == self.class
    @_cache = args._cache
  end

  # opt for CSV.parse.
  # default is {}, which means that dont change the default behaviour
  # of CSV.parse_line.
  #@opt = {}
  @_lazy_parser_default = lambda{|s| CSV.parse_line(s)}

  #
  #
  #
  #@_lazy_parser = lambda{|x,o| CSV.parse(x,o).first}
  @_lazy_parser = @_lazy_parser_default

end

Instance Attribute Details

#_cache ⇒ Object (readonly)

Returns the value of attribute _cache.



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# File 'lib/podcsv.rb', line 44

def _cache
  @_cache
end

#_lazy_parser ⇒ Object

Returns the value of attribute _lazy_parser.



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# File 'lib/podcsv.rb', line 46

def _lazy_parser
  @_lazy_parser
end

#_lazy_parser_default ⇒ Object (readonly)

Returns the value of attribute _lazy_parser_default.



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# File 'lib/podcsv.rb', line 45

def _lazy_parser_default
  @_lazy_parser_default
end

Instance Method Details

#[](args) ⇒ Object 



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# File 'lib/podcsv.rb', line 50

def [](args)
  ret = nil

  # .
  if args.is_a?(Integer)
    tmp = super

    # cache function.
    if self.cached?(args)

      # do nothing.

    else
      #tmp = super
      #$stderr.puts "*tmp (class:#{tmp.class}):#{tmp}"
      if tmp.class == String

        #@_cache[args] = @_lazy_parser.call(tmp, @opt)
        @_cache[args] = @_lazy_parser.call(tmp)
           self[args] = @_cache[args]

      else
        @_cache[args] = tmp unless self.cached?(args)
      end
    end

    #$stderr.puts "_cache[#{args}]: #{@_cache[args]}"
    @_cache[args]   # return the value of self[args].
    #self[args]
    #self[args] = @_cache[args]
  else
    # Range, etc.
    # $stderr.puts "[INFO] access for #{args} (#{args.class})."

    # copy partial array.
    idxs = Array(args)
    pary = idxs.map{|ii| self[ii]}
    ret = PodArray.new(
      # Integer
      pary
    )

    # copy partial cache.
    ini_cache = self._cache
    idxs.each {|ii|
      ret.instance_eval{ @_cache[ii] = ini_cache[ii] }
    }

    ret
  end
end

#cached?(i) ⇒ Boolean 



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# File 'lib/podcsv.rb', line 41

def cached?(i)
  not(@_cache[i].nil?)
end

#each ⇒ Object 



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# File 'lib/podcsv.rb', line 128

def each
  s = self
  a = Array(s.to_a)   # cast to Array.

  #$stderr.puts "s: #{s.class}"
  #$stderr.puts "a: #{a.class}"
  #pp a

  # do cache.
  a.each.with_index {|_,i|
    # $stderr.puts "i: #{i}"
    self[i]   # do cache.
    yield(self[i]) if block_given?
  }

  # return
  if block_given?
    self
  else
    self.to_enum
  end
end

#first ⇒ Object 



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# File 'lib/podcsv.rb', line 107

def first
  #$stderr.puts "#{self.class}##{__method__} ()"
  # self.index(0)
  self[0]
end

#index(x) ⇒ Object 



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# File 'lib/podcsv.rb', line 102

def index(x)
  #$stderr.puts "#{self.class}##{__method__} (#{x.class})"
  self[x]
end

#last ⇒ Object 



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# File 'lib/podcsv.rb', line 113

def last
  #$stderr.puts "#{self.class}##{__method__} ()"
  self[self.size-1]
end

#map ⇒ Object 



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# File 'lib/podcsv.rb', line 151

def map
  tmp = self.each
  ret = []

  tmp.each{|e|
    ret << yield(e) if block_given?
  }

  # return
  if block_given?
    ret
  else
    tmp
  end

end

#reverse ⇒ Object 



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# File 'lib/podcsv.rb', line 118

def reverse
  #$stderr.puts "#{self.class}##{__method__} ()"
  ret = PodArray.new(super)
  #$stderr.puts "#{self.class}##{__method__} ret: #{ret.class}"
  #$stderr.puts "#{self.class}##{__method__} ret.first: #{ret.first.class}"

  ret
end

#select ⇒ Object 



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# File 'lib/podcsv.rb', line 168

def select
  tmp = self.each
  ret = []

  tmp.each{|e|
    # $stderr.puts "#{e} (#{e.class})"
    if block_given?
      ret << e if yield(e)
    end
  }

  # return
  if block_given?
    PodArray.new(ret)
  else
    tmp
  end

end