@nexssp/expression-parser

Easy Object expression-parser. See below for details.

NOTE: This module is experimental! It works, but may have some issues. Submit new issue if you have found any issue..

Installation

npm i @nexssp/expression-parser

Usage

When there is error in parsing

It shows the error with suggestion when there is type for example:

Expression Parser

const ep = require("@nexssp/expression-parser");

const data = { x: 1, y: 2, s: "some string", obj: { z: 1, d: 5 } };
console.log(ep.expressionParser("HERE: ${s}: ${x+y+obj.z}", data));

// Result: HERE: some string: 4

parseData

const ep = require("@nexssp/expression-parser");

const data = {
  my1stVar: "myfirst variable",
  number: 5,
  another: 10,
  functionx: (y) => {
    x = 3;
    return x + y;
  },
  something: "Here is evaluated the object itself: ${my1stVar}",
  calculate: "Some calculations working: ${number+another} ${functionx(1000)}",
  ommitedField: "Will not be evaluated: ${number+another}",
  x: "${a+b+C}", // Will not show error if a, b or C does not exist. as it is not evaluated.
};

console.log(ep.parseData(data, ["ommitedField", "x"]));

Result below. You can even use functions defined in the object etc. see ${functionx(1000)}

{
  my1stVar: 'myfirst variable',
  number: 5,
  another: 10,
  functionx: [Function: functionx],
  something: 'Here is evaluated the object itself: myfirst variable',
  calculate: 'Some calculations working: 15 1003',
  ommitedField: 'Will not be evaluated: ${number+another}',
  x: '${a+b+C}'
}