如何消除EBNF实例语法中的歧义

Question

我如何防止结构规则中的"，“字面被解析为以下用于Instaparse的EBNF语法中的运算符？

语法：

structure = atom <"("> term ("," term)* <")"> 
term = atom | number | structure | variable | "(" term ")" | term operator term
operator = "," | ";" | "\\=" | "=="

Answer 1

像您一样使用逗号作为分隔符和运算符会使逗号上下文敏感，而Ebnf本身无法处理这一问题。