expression-processor
v1.0.2
Published
EP will convert string of condition to boolean value
Downloads
3
Maintainers
thainamhoangReadme
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
- 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!!!
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 falseSupported 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 |