Naive parsing/generating off Mediawiki tables. I use this for automating some Wikipedia edits.

wikitable.rb

# -*- coding: utf-8 -*-
class WikiTable
  attr_accessor :rows, :attributes

  class Row
    attr_accessor :cells, :attributes
    def initialize
      @cells = []
    end
    def <<(c); cells << c ; end
    def to_s
      "|-#{attributes}\n".tap do |s|
        cells.each_with_index do |c,i|
          s << (c.header? ? '!'  : '|')  if i == 0
          s << (c.header? ? '!!' : '||') if i > 0
          s << c
        end
      end
    end
  end
  class Cell 
    attr_accessor :content, :attributes, :header
    def initialize( content = nil, attributes = nil, header = false )
      @content, @attributes, @header = content, attributes, header
    end
    def header? ; header ; end
    def to_str
      attributes ? "#{attributes}|#{content}" : content
    end
    def self.parse( cell )
      if cell =~ /\|/
        cell.split('|')
      else
        [ nil, cell ]
      end
    end
  end

  def initialize
    @rows = []
  end

  def to_s
    [
      "{|#{attributes}",
      rows.map(&:to_s),
      "|}",
    ].join("\n")
  end

  def self.parse( content )
    WikiTable.new.tap do |table|
      current_row = Row.new
      current_cell = nil
      content.lines.each do |line|
        line = line.strip
        case line
        when /^\{\|(.*)/
          table.attributes = $1
        when /^\|\}/
          table.rows << current_row
          break
        when /^\|-(.*)/
          table.rows << current_row
          current_row = Row.new
          current_row.attributes = $1
        when /^\|[^\|].*\|\|/
          line[1..-1].split('||').each do |cell|
            current_cell = Cell.new
            current_cell.attributes, current_cell.content = Cell.parse( cell )
            current_row << current_cell
          end
        when /^!(.*)/
          current_cell = Cell.new
          current_cell.header = true
          current_cell.attributes, current_cell.content = Cell.parse( line[1..-1] )
          current_row << current_cell
        end 
      end
    end 
  end
end