cyt
新版本的Qu
以前写过一篇qu的介绍blog（见http://www.cppblog.com/cyt/archive/2005/10/08/579.html）。
现在语言已经出到1.21.03版本。当然，其进步也已经不少。主页在：http://centrin.net.id/~marc/

1、语言对象丰富了很多。因为不记得以前有多少种了，所以也说不清究竟多了多少。不过现在看内部支持的类型列表，明显比以前多了。例如Socket、Thread、Weak、Proc等等。

2、支持嵌入HTML，例如：
pragma html

options = [foo:1, bar:2, baz:3]

<FORM ACTION="/foo" METHOD="POST">
    <SELECT NAME="choice">
    for k, v in options
        <OPTION VALUE=v>(\k)</OPTION>
    ;;
    <INPUT TYPE="submit" VALUE="Send">
    </SELECT>
</FORM> 

3、提供了 JIT engine，就是用上次介绍过 GNU Lightning。换句话说，代码可以翻译为汇编代码，可以在x86, SPARC and PowerPC等机器上执行。变成汇编，其性能提高多少可想而知。qu自己也列出了其性能比较：http://centrin.net.id/~marc/performance.html

4、提供一种validators技术，动态类型语言的数据类型灵活多变，所以类型校验显得比较重要。例如：
sub Message (x)
    return x is String and x and not x.isspace ? x.capitalize : false
;;

sub hello (s: Message)
    println ('Hello ', s) # guess what it prints!
end sub
Message看起来好像是一个函数的样子，但它可以用来验证变量的类型。保证传入hello函数的参数s，必须要满足Message(s)返回true。

5、灵活的语法，特别是支持lambda语法。喜欢ruby的估计也会喜欢这个
f = sub (x) return x.len > 3 ;;
f = lambda (x) x.len > 3
f = {|x| x.len > 3}
f = {|x| yield i for i in x}

反正主页上列出了很多很多吸引人的Features。不过具体实用性如何，我就不知道了。暂时看不到有什么著名的成功案例。不过语言真的是越来越吸引了。
posted on 2006-04-14 23:09 cyt 阅读(2450) 评论(19)  编辑 收藏 引用 所属分类: Work
Comments
  • # re: 新版本的Qu
    灵感之源
    Posted @ 2006-04-19 21:26
    “4、提供一种validators技术”

    语法很明显是参考了BASIC :)

      回复  更多评论   
  • # re: 新版本的Qu
    cyt
    Posted @ 2006-04-21 21:53
    感觉上就是大杂烩，估计作者是把各种语言自己喜欢的部分都综合起来。不过反而显得没有自己的风格。  回复  更多评论   
  • # re: 新版本的Qu
    qindebu
    Posted @ 2006-04-24 13:57
    对这个也比较感兴趣，想研究一下Lightning，多多交流  回复  更多评论   
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