gistfile1.txt

require 'rubygems'
require 'parslet'

class Mini < Parslet::Parser
  root(:lines)

  rule(:lines)    { line.repeat }

  rule(:line)     { (title | ingredient | step) >> newline.maybe }

  rule(:title)    { str('#') >> space.maybe >> (newline.absent? >> any).repeat.as(:title) }

  rule(:ingredient) { str('*') >> space.maybe >> (newline.absent? >> any).repeat.as(:ingredient) }

  rule(:step)     { (match("\\d").repeat.as(:number) >> str(".") >> space.maybe >> (newline.absent? >> any).repeat).as(:step) }

  rule(:newline)  { str("\n") >> str("\r").maybe }
  rule(:space)    { match('\s').repeat(1) }
end

def parse(str)
  mini = Mini.new
  puts "Parsing #{str}: "

  p mini.parse(str)
rescue Parslet::ParseFailed => error
  puts error, mini.root.error_tree
end

recipe = "#test title\n*hi there\n* ingredient 2\n1. step 1\n42. step 42"

p parse(recipe) # => [{:title=>"test title"@1}, {:ingredient=>"hi there"@13}, {:ingredient=>"ingredient 2"@24}, {:step=>{:number=>"1"@37}}, {:step=>{:number=>"42"@47}}]