expression-parser-js

Why Expression Parser?

• Small and simple, but powerful.

• No dependency, no ast.

Install

npm install expression-parser-js

Usage

var parser = require('expression-parser-js');
parser.parse(input, model)

examples

var model = {};
model.a = 1;
model.b = 2;
model.c = function () {
   return {
       d: 5
   }
};

model.e = ['a', 'b', 'c'];
model.f = [false];
model.h = ['a b', 'b c'];
model.g = [{
   a:1
}]
function exec(input) {
   return parser.parse(input, model);
}
console.log(exec('1 in [1,2,3]'));
console.log(exec('(1 in [1,2,3])'));
console.log(exec('a>=1'));
console.log(exec('c().d==5'));
console.log(exec('!(a>=1 && c().d == 5 && b<=2)'));
console.log(exec('a>=1 && c().d == 5 && b>2'));
console.log(exec('a>=1 || c().d == 5 || b>2'));
console.log(exec('(a>=1 && c().d == 5) || b>2'));
console.log(exec('a>=1 && (c().d == 5 || b>2)'));
console.log(exec('"a" in e'));
console.log(exec('"e" in e'));
console.log(exec('!("e" in e)'));
console.log(exec('!(f[0])'));
console.log(exec('f[0]'));
console.log(exec('"a b" in h'));
console.log(exec('a+1'));
console.log(exec('g[0].a+1'));

demo

open examples/index.html

Tests

npm install
mocha

Developer

npm install
gulp
open examples/index.html

Not Support

console.log(exec('a>=1 && c().d == 5 && !(b>2)'));