Module: MLL

Defined in:
lib/mll.rb

Class Method Summary collapse

Class Method Details

.define_listable_function(name, &block) ⇒ Object 



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# File 'lib/mll.rb', line 206

def define_listable_function name, &block
  (class << self; self end).class_eval do
    define_method name do
      lambda do |*args|
        case args.map{ |i| i.respond_to? :map }
          when [true] ; args.first.lazy.map &method(name).call
          when [true, true] ; args.first.lazy.zip(args.last).map{ |i, j| send(name)[i, j] }
          when [true, false] ; args.first.lazy.map{ |i| send(name)[i, args.last] }
          when [false, true] ; args.last.lazy.map{ |i| send(name)[args.first, i] }
        else
          block.call *args
        end
      end
    end
  end
end

.define_orderless_function(name, start, &block) ⇒ Object

reference.wolfram.com/language/ref/Orderless.html



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# File 'lib/mll.rb', line 258

def self.define_orderless_function name, start, &block
  (class << self; self end).class_eval do # http://stackoverflow.com/a/12792313/322020
    define_method name do
     lambda do |*args|
        args.inject(start) do |memo, obj|
          block.call memo, obj
        end
      end
    end
  end
end

.dimensions ⇒ Object 



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# File 'lib/mll.rb', line 5

def dimensions
  lambda do |list, limit = nil|
    list = [list]
    enumerator = Enumerator.new do |e|
      # String.size shall not pass
      while list.all?{ |i| i.respond_to? :each } &&
            list.map(&:size).uniq.size == 1
        # TODO refactor into depth-first yielding
        e << list.first.size
        list.flatten! 1
      end
    end
    limit ? enumerator.lazy.take(limit) : enumerator
  end
end

.fold_list ⇒ Object 



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# File 'lib/mll.rb', line 60

def fold_list
  lambda do |x, list, f = nil|
    unless f
      f = list
      x, *list = x.to_a
    end
    # TODO use Ruby#inject ?
    Enumerator.new do |e|
      e << x
      list.each do |i|
        e << x = f.call(x, i)
      end
    end
  end
end

.grid ⇒ Object

www.unicode.org/charts/PDF/U2500.pdf en.wikipedia.org/wiki/Box_Drawing



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# File 'lib/mll.rb', line 119

def grid
  lambda do |table, **options|
    # TODO negative spacings?
    options[:spacings] ||= [1, 1]
    spacings_horizontal, spacings_vertical = [*options[:spacings]]
    spacings_vertical ||= 1
    raise ArgumentError.new("unknown value of :alignment option '#{options[:alignment]}'") unless \
      alignment = {
        nil => :center,
        :center => :center,
        :left => :ljust,
        :right => :rjust,
      }[options[:alignment]]
    frames = {
      nil  => "              ",
      true => "┃ ┏┓ ┗┛━ ┃━━┃ ",
      :all => "┃┃┏┓╋┗┛━━┣┳┻┫ ",
    }[options[:frame]]
    raise ArgumentError.new("unknown value of :frame option '#{options[:frame]}'") if options[:frame] && !frames
    # TODO smth with this #.all?
    table = [table] unless table.all?{ |e| e.respond_to? :each }
    width = table.map(&:size).max - 1
    strings = table.map{ |row| row.dup.tap{ |a| a[width] = a[width] }.map(&:to_s) }
    sizes = strings.transpose.map{ |col| col.map(&:size).max + [spacings_horizontal * 2 - 2, 0].max }
    # TODO https://reference.wolfram.com/language/ref/Alignment.html
    border_vertical  = [frames[9], sizes.map{ |size|  frames[8] * size }.join((frames[4] unless spacings_horizontal.zero?)), frames[12]]
    spacing_vertical = [frames[0], sizes.map{ |size| frames[13] * size }.join((frames[0] unless spacings_horizontal.zero?)), frames[0]]
    gap_vertical = lambda do |i|
      j = i - 1
      [*-j..j].map{ |k| [border_vertical][k] || spacings_vertical }
    end.call spacings_vertical
    [
      [frames[2], sizes.map{ |size| frames[7] * size }.join((frames[10] unless spacings_horizontal.zero?)), frames[3]].join,
      *([spacing_vertical.join] * [spacings_vertical - 1, 0].max),
      strings.map{ |row| [frames[0], row.zip(sizes).map{ |str, size|
        str.method(alignment).call(size)
      }.join((frames[1] unless spacings_horizontal.zero?)), frames[0]].join }.join(
        ?\n + gap_vertical.map{ |gap| gap.join + ?\n }.join
      ),
      *([spacing_vertical.join] * [spacings_vertical - 1, 0].max),
      [frames[5], sizes.map{ |size| frames[7] * size }.join((frames[11] unless spacings_horizontal.zero?)), frames[6]].join,
    ].join(?\n) + ?\n
  end
end

.map ⇒ Object 



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# File 'lib/mll.rb', line 76

def map
  # TODO validate depths
  # TODO break on passing all depths
  lambda do |list, depths, f = nil|
    depths, f = [1], depths unless f
    depths = Range.new(*depths) if depths.size == 2
    depths = Range.new(1,depths) if depths.is_a? Integer
    g = lambda do |list, depth|
      next list unless list.is_a? Array
      temp = list.lazy.map{ |i| g[i, depth + 1] }
      temp = temp.lazy.map &f if depths.include? depth
      temp
    end
    g[list, 1]
  end
end

.mean ⇒ Object 



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# File 'lib/mll.rb', line 273

def self.mean
  lambda do |list|
    divide[times[plus[*list], 1.0], list.size]
  end
end

.nest ⇒ Object 



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# File 'lib/mll.rb', line 34

def nest
  lambda do |expr, n, f|
    n.times{ expr = f.call expr }
    expr
  end
end

.nest_list ⇒ Object 



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

def nest_list
  lambda do |expr, n, f|
    Enumerator.new do |e|
      e << expr
      n.times do
        e << expr = f.call(expr)
      end
    end
  end
end

.nest_while ⇒ Object 



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# File 'lib/mll.rb', line 52

def nest_while
  # TODO finish me
  lambda do |expr, f, test|
    expr = f[expr] while test[expr]
    expr
  end
end

.riffle ⇒ Object 



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# File 'lib/mll.rb', line 178

def riffle
  lambda do |*args|
    case args.size
      when 2
        next riffle[*args, [2,-2,2]] unless args[1].respond_to?(:each) && args[0].size == args[1].size
        Enumerator.new do |e|
          args[0].zip(args[1]){ |i, j| e << i << j }
        end
      when 3
        args[2] = [args[2], -2, args[2]] unless args[2].respond_to? :each
        Enumerator.new do |e|
          min = (args[2][0] < 0) ? (args[0].size + args[2][0]) : args[2][0] - 1
          max = (args[2][1] < 0) ? (args[0].size + args[2][1]) : args[2][1]
          min, max = max, min if args[2][0] < 0
          step = args[2][2]
          pos = 0
          args[0].each_with_index do |x, i|
            # TODO make it not destructive
            (pos += 1; e << x)
            (pos += 1; e << (args[1].respond_to?(:each) ? args[1].rotate!.last : args[1])) if min - 1 <= i && i <= max && (pos - min) % step == 0
          end
        end
    else
      raise ArgumentError.new("wrong number of arguments (#{args.size} for 2..3)")
    end
  end
end

.subdivide ⇒ Object 



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# File 'lib/mll.rb', line 164

def subdivide
  lambda do |*args|
    case args.size
      when 1 ; subdivide[1, args[0]]
      when 2 ; subdivide[0, args[0], args[1]]
      when 3
        # raise ArgumentError.new("can't divide into 0 parts") if args[2].zero?
        range[args[0], args[1], (args[1] - args[0]) * 1.0 / args[2]]
    else
      raise ArgumentError.new("wrong number of arguments (#{args.size} for 1..3)")
    end
  end
end

.table ⇒ Object 



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# File 'lib/mll.rb', line 93

def table
  lambda do |f, *args|
    [].tap do |result|
      [[result, args.map{ |r| # add lazy?
        r.respond_to?(:map) && r.first.respond_to?(:map) ?
          r.first : range[*r]
      }]].tap do |stack|
        stack.each do |ai, ri|
          # TODO try to make #table lazy (Enumerator instead of Array)
          # "no implicit conversion of Enumerator::Lazy into Array"
          # "undefined method `replace' for #<Enumerator::Lazy: []>"
          ai.replace ri.first.map{ |i|
            if ri.size == 1
              f.respond_to?(:call) ? f.call(*ai, i) : f
            else
              [*ai.dup, i].tap{ |t| stack << [t, ri.drop(1)] }
            end
          }
        end
      end
    end
  end
end

.tally ⇒ Object 



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# File 'lib/mll.rb', line 21

def tally
  lambda do |list, test = nil| # implement #sameq ?
    return Hash[ list.group_by{ |i| i }.map{ |k, v| [k, v.size] } ] unless test
    Hash.new{ 0 }.tap do |result|
      list.each do |item|
        result[
          list.find{ |key| test[key, item] }
        ] += 1
      end
    end
  end
end