问题描述
是否有任何 lisps 支持在它们的头上嵌套 s 表达式?例如
Do any lisps support nested s-expression on their head? For example
((f 2) 3 4)
对于其中 (f 2) 大概评估为一个函数/宏以应用于 3 4.
for which (f 2) presumably evaluates to a function/macro to apply on 3 4.
是否有可能有一个 lisp 支持这样的事情?或者是否有技术限制禁止这样做/使其不切实际?
Is it possible to have a lisp supporting such a thing? Or are there technical limitations that prohibit this/make it impractical?
推荐答案
在那些为变量和函数具有单一命名空间的 Lisps 中，您的表达式是有效的.这些被称为 Lisp-1.Scheme 和 Clojure 就是此类 Lisp 的示例.
In those Lisps, which have single namespace for variables and functions, your expression is valid. These are called Lisp-1. Scheme and Clojure are examples of such Lisps.
在那些为变量和函数具有单独命名空间的 Lisps 中，您的表达式将是 (funcall (f 2) 3 4).这些被称为 Lisp-2.Common Lisp 和 Emacs Lisp 就是此类 Lisp 的示例.
In those Lisps, which have separate namespaces for variables and functions, your expression would be (funcall (f 2) 3 4). These are called Lisp-2. Common Lisp and Emacs Lisp are examples of such Lisps.
在 Lisp-2 中，每个符号都有一个值槽和一个函数槽.要调用存储在值槽中的函数，您需要使用funcall 关键字.
In Lisp-2 every symbol has a value slot and a function slot. To call a function, that is stored in a value slot you need to use funcall keyword.
查看有关此问题的更多信息:http://www.dreamsongs.com/Separation.html
See more on this issue: http://www.dreamsongs.com/Separation.html
感谢 Rainer Joswig 我更正了答案.
Thanks to Rainer Joswig i corrected the answer.
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