口译员的环境是什么? [英] What is environment for an interpreter?

问题描述

我正在上一门名为《编程语言原理》的课程.它介绍了一个简单的解释器的设计.

I'm taking a course named Programming Language Principles. It introduces design of a simple interpreter.

gere的解释器的一个单独的代码:

And gere's one piece code of this interpreter:

(define valof
 (lambda (exp env)
  (dmatch exp
    [,sym (guard (symbol? sym)) (env sym)]
    ... )))

我想知道翻译器中的环境是什么.

I want to know what is environment in an interpreter.

推荐答案

在像您正在使用的解释器中，环境是将值与变量名相关联的对象.通常，它是一个框架列表，每个框架都是一个变量绑定列表.

In an interpreter like the one you're looking at, the environment is the object that associates values with variable names. Typically it is a list of frames, and each frame is a list of variable bindings.

看看 计算机程序的结构和解释 ，用于讨论评估者如何使用环境.

Take a look at Structure and Interpretation of Computer Programs for a discussion of how an evaluator uses an environment.

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