class EacRubyUtils::RegexpParser

def initialize(pattern, &builder_proc)
  @pattern = pattern
  @builder_proc = builder_proc
end

def internal_parse(string)
  m = pattern.match(string)
  if m
    [true, builder_proc ? builder_proc.call(m) : m]
  else
    [false, nil]
  end
end

def parse(string)
  internal_parse(string)[1]
end

def parse!(string)
  match, result = internal_parse(string)
  return result if match
  raise ::ArgumentError, "String \"#{string}\" does not match pattern \"#{pattern}\""
end

def parse?(string)
  internal_parse(string).first
end