expression-parser-js
v0.1.2
Published
Implementation of logical expressions for JavaScript.
Downloads
7
Readme
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)'));