Prototype of Table Syntax

tablesyntax_prototype.rb

class Table
  attr_reader :header, :rows

  def initialize(header, rows)
    @header = header
    @rows = rows
  end
end

class Row
  def initialize(elements)
    @elements = Array(elements)
  end

  def |(elm)
    @elements.push elm
    self
  end

  def each
    @elements.each do |elm|
      yield elm
    end
  end

  def slice(size)
    @elements.each_slice(size).map { |elm| Row.new(elm) }
  end

  def to_s
    @elements.to_s
  end
end

module TableSyntax
  [String, Integer].each do |klass|
    refine klass do
      def |(elm)
        Row.new(self).|(elm)
      end
    end
  end

  def table(*header, &block)
    row = block.call

    [header, row.slice(header.size)]
  end
end

class Table
  include TableSyntax

  using TableSyntax

  def generate
    @rows = table :name, :age do
      'SU-METAL' | 22 |
      'MOAMETAL' | 20
    end
  end

  def to_s
    @rows.map(&:to_s).join("\n")
  end
end

puts Table.new.foo