用于解析逻辑表达式的Java库

Question

I am having a String like "A AND B OR C AND ( D OR E)". I just want to parse the logical expression here, is there any Java Api for the same.

Here A,B,C... are in the form of string,string,string (ie key,value,operator)

Answer 1

First you will need to fix the grammar of the expression that you are going to accept. What you have written:

"A AND B OR C AND ( D OR E)"

is an example string of your language. So first you will need to define your language which can be defined using BNF . This would give you complete understanding of the your own language.

And then any aribitrary expression that you input need to be parsed. You can create an expression tree

And finally you will need to evaluate the expression tree.

A reasonable example of how it can be done is given in this article

Answer 2

使用Spring Expression-支持AND OR NOT