扩展魅力解释器 [英] Extending the Charme Interpreter

问题描述

我需要扩展Charme解释器(在此处)，方法是将原始过程< =添加到全局环境中.我知道要执行此操作，我还需要定义一个实现原语的过程，并修改initializeGlobalEnvironment以安装原语.

I need to extend the Charme interpreter (described here) by adding a primitive procedure <= to the global environment. I know that to do this I also need to define a procedure that implements the primitive, and modify initializeGlobalEnvironment to install the primitive.

这就是我要的initializeGlobalEnvironment-

def initializeGlobalEnvironment():
    global globalEnvironment
    globalEnvironment = Environment(None)
    globalEnvironment.addVariable('true', True)
    globalEnvironment.addVariable('false', False)
    globalEnvironment.addVariable('+', primitivePlus)
    globalEnvironment.addVariable('-', primitiveMinus)
    globalEnvironment.addVariable('*', primitiveTimes)
    globalEnvironment.addVariable('=', primitiveEquals)
    globalEnvironment.addVariable('zero?', primitiveZero)
    globalEnvironment.addVariable('>', primitiveGreater)
    globalEnvironment.addVariable('<', primitiveLessThan)

推荐答案

我不确定魅惑的确切语法，但是近似的scheme-y代码将是

I am not sure about the exact syntax for charme, but the approximate scheme-y code would be

primitiveLessThanEqualTo = '(lambda (x y) (if (= x y) (true) (if (< x y) (true) (false))))'
globalEnvironment.addVariable('<=', primitiveLessThanEqualTo)

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