script = <<-eos
    if the '$1-$2 No Limit' list is more than a then notify the floor to open
    if the '$1-$2 No Limit' list is more than 1 then notify the floor to opeeen
    if the '$1-$2 No Limit' list is more than z then ntify the floor to open
    if the '$1-$2 No Limit' list is more than 1 then notify the floor to open
eos

class SyntaxCheckingContext
  
  def self.execute(text)
    rules = polish_text(text)
    rules.each_with_index do |rule, index|
      result = self.new.instance_eval(rule)
      yield result, index if block_given? && result.any?
    end
  end

  def self.polish_text(text)
    rules = text.split("\n")
    rules.collect do |rule|
      rule.gsub!(/'.+'/,extract_stakes(rule))
      rule << " end"
    end
  end

  def self.extract_stakes(rule)
    stakes = rule.scan(/'.+'/).first
    stakes.delete!("'").gsub!('$','dollar').gsub!('-','dash').gsub!(' ','space')
  end

  def self.sym_to_stakes(sym)
    sym.to_s.gsub!('dollar','$').gsub!('dash','-').gsub!('space',' ')
  end
  
  %w(open is list the to announce floor).each do |method|
    define_method(method.to_sym) { |*args| true }
  end
  
  def than(arg)
    arg
  end

  def initialize
    @errors = []
  end
  
  def more(number)
    @errors << "more than should be followed by a number" unless number.kind_of?(Numeric)
    number
  end
  
  def notify(arg)
    @errors.join(', ')
  end
  
  def method_missing(sym, *args)
    if sym.to_s =~ /^dollar\d+dashdollar\d+space(Nospace)*Limit/
      return true
    end
    @errors << "#{sym.to_s} is an invalid keyword"
    @errors.join(', ')
  end

end

module Kernel
  def silence_warnings
    old_verbose, $VERBOSE = $VERBOSE, nil
    yield
  ensure
    $VERBOSE = old_verbose
  end
end

silence_warnings do
  puts "\nSyntax Check:"
  SyntaxCheckingContext.execute(script) do |error, line|
    puts "errors on line #{line}, (#{error})"
  end
end