ParsaJS
Library to parse and evaluate arithmetic expressions without eval()
Supports basic operators [ ** * / % + - ( ) ] and variables.
Order of operations: BEMDAS
Usage
npm i parsa-js
import Parsa from "parsa-js"
const myParser = new Parsa()
let parse = await myParser.parse('a*(20/8)*b,{"a":3,"b":2}')
let evaluation = await myParser.evaluateAll(parse.items)
console.log(evaluation)
// Log:
// {
// complete: true,
// eval: 15,
// items: [{ "15", "number" }]
// blocks: [{ id: 1, prio: 0, startIndex: 0, endIndex: 0 }],
// }Methods
parse(string)
Parses an input string for evaluation
Params: string
Returns a promise:
{
msg: string,
items: [{ value, type}, ...]
}
evaluateAll(items)
Evaluates the expression string
Params: array of expression items
Returns a promise:
{
blocks: [{ ... }],
complete: boolean (true),
eval: number,
items: [{ ... }]
}
evaluateNext(items)
Evaluates the next block according to order of operations
Params: array of expression items
Returns a promise:
{
blocks: [{ ... }],
complete: boolean (false),
eval: number,
items: [{ ... }]
}
getSourceString()
Returns the original input string
getSourceItems()
Returns an array of parsed expression items
License: MIT