Expression Processor

Expression Processor - like its name - is an evaluator (or filter) for an input string. It can parse a string of condition and return true or false depend on key value of the choosen user in the database.

Installation

npm i expression-processor or yarn add expression-processor

Testing

EP provides some sample cases to be run with jest. For testing, please install jest by npm i jest --save-dev or yarn add jest --dev and then npm test or yarn test.

Usage

1. Write down a condition to check (with parentheses). For example, we want to check the type of the phone, the OS and email suffix: (deviceName == iPhone && phoneOs == IOS && email <matches-regex> @yahoo.com)
2. Import the suitable user info
3. Execute!!!

Example

Considered the mentioned condition. This is how we use it:

const Run = require("./index");

const condition =
  "(deviceName == iPhone && phoneOs == iOS && email <matches-regex> @yahoo.com)";
const userInfo = {
  deviceName: "iPhone",
  phoneOs: "iOS",
  email: "[email protected]",
};

console.log(Run(userInfo, condition)); // return false

Supported operators/filters

| Operator/Filter | Description | | :----------------: | :----------------------: | | || | OR | | && | AND | | ! | NOT | | () | Parentheses | | == | EQUAL_TO | | != | NOT_EQUAL_TO | | < | LESS_THAN | | <= | LESS_THAN_OR_EQUAL_TO | | > | GREATER_THAN | | >= | GREATER_THAN_OR_EQUAL_TO | | <contains> | CONTAINS: | | <array-contains> | ARRAY_CONTAINS | | <in> | IN | | <begins-with> | BEGINS_WITH | | <ends-with> | ENDS_WITH | | <matches-regex> | MATCHES_REGEX |

tags: expression, boolean, condition