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.
npm i expression-processor or yarn add expression-processor
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.
- 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) - Import the suitable user info
- Execute!!!
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: "package_testing@gmail.com",
};
console.log(Run(userInfo, condition)); // return false| Operator/Filter | Description |
|---|---|
| ` | |
&& |
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 |