justinyun (justinyun)

ruby load file -- 学习问题

justinyun — Fri, 16 Aug 2013 16:02:39 +0800

下面是代码，

file1.rb

event "the sky is falling" do
    @sky_height < 300
end

event "it's getting closer" do
    @sky_height < @mountains_height
end

setup do
    puts "Setting up sky"
    @sky_height = 100
end

setup do
    puts "Settig up mountains"
    @mountains_height = 200
end

main.rb

def event(name, &block)
    @events[name] = block
end

def setup(&block)
    @setups << block
end

Dir.glob('file1.rb').each do |file|
    @setups = []
    @events = {}
    load file
    @events.each_pair do |name, event|
        env = Object.new
        @setups.each do |setup|
            env.instance_eval &setup
        end
        puts "ALERT: #{name}" if env.instance_eval &event
    end
end

执行结果如下：

Setting up sky Settig up mountains ALERT: the sky is falling Setting up sky Settig up mountains ALERT: it's getting closer

问题来了，在 main.rb 中，先调用的 load file, 应该先去执行 file1.rb 里面的方法，然后再执行下去，有点看不懂，求指点...