虽然 PDP-15 支持各种操作系统，但是此机器的有趣用法与公式计算器 (FOCAL) 语言一起使用。
Although the PDP-15 supported a variety of operating systems, one interesting use of this machine is with the formula calculator (FOCAL) language.
这里构建的 DSL 是一个简单的计算器语言，用于获取并计算数学表达式。
The DSL being built here is a simple calculator language, designed to take mathematical expressions and evaluate them.
您要做的第一件事是为计算器语言定义该 AST。
The first item on our plate is to define this AST for the calculator language.
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