isare.rb

# coding: utf-8

Types = {}
Objects = {}

def enum part
  part.split(/, | and /)
end

def scan part, type
  parts = part.scan(/(\w+ is \w+|\w+(?:, \w+)+ are \w+(?:, \w+)+)/)
  s = parts.reduce({}) { |s, a|
    if m = a[0].match(/(\w+) is (\w+)/)
      s[m[1]] = m[2]
    else
      s.merge! a[0].split(/ are /).map { |e| enum e }.reduce(&:zip).to_h
    end
    s
  }
  Types[type]&.each { |field| s[field] ||= nil }
  s
end

def parse sentence
  case sentence
  when /a (\w+) is defined by (.+)/
    Types[$1] = enum $2
  when /there is a (\w+) called (\w+)(.+)/
    Objects[$2] = scan $3, $1
  when /the (.+?) is (?:called )?(.+)/
    Objects[$1] = $2
  end
end

DATA.read.downcase.split(/\.\s+/).map(&:strip).each { |s| parse s }

pp Objects

__END__

A rect is defined by x, y, width and height.
There is a rect called X, its x, y are 114, 514 and its width is 1919810.
The game title is called hello world.