logic-expression-exec

Exec AND and OR logic by defination function

Installation

npm install logic-expression-exec
#or
yarn add logic-expression-exec

API

Basic

Property	Description	Type	Default
expression	-	string	""
parseExpression	how to handle expression	function	undefined
parseExpressionProps	the props of handleExpression	any	undefined
appendProps	the props to store	any	undefined

Operator:

Property	Description	Type	Default
and	AND	string	&&
or	OR	string	||
bracketLeft	left of bracket	string	(
bracketLeft	right of bracket	string	)

How to use it

import LogicExpressionExec from "logic-expression-exec"; //es
// const LogicExpressionExec = require("logic-expression-exec");//commonjs
// const LogicExpressionExec = window["logic-expression-exec"];//html

let expressionExec = new LogicExpressionExec({
    expression: "(#0 || #1) && #2",
    parseExpression: (expression, props) => { //you can write your own logic to determine how to handle the expression
        if (typeof expression == "string" && expression.startsWith("#")) {
            let item = props[expression.slice(1)];
            const [val1, opr, val2] = item;
            if (opr == "==") {
                return val1 == val2;
            } else if (opr == ">") {
                return val1 > val2;
            } else if (opr == "<") {
                return val1 < val2;
            }
        }
        return expression;
    }

});

let result;

expressionExec.update({
    parseExpressionProps: [
        [1, "==", 2],
        [2, "==", 2],
        [3, ">", 2],
    ]
});
result = expressionExec.exec();
console.log(result); //true

expressionExec.update({
    parseExpressionProps: [
        [1, "==", 2],
        [2, "==", 2],
        [3, "<", 2],
    ]
});
result = expressionExec.exec();
console.log(result); //false