@sensative/jsep-eval

jsep-eval: evaluate javascript expressions

jsep-eval evaluates javascript expressions, and uses jsep to parse the expressions. A context can/should be supplied against which identifers are matched.

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#### Node.JS
First, run npm install jsep-eval. Then, in your source file:
``javascript
const jsepEval = require("jsep-eval");
const evaluate = jsepEval.evaluate;
const two = evaluate('1 + 1');
const three = evaluate('two + 1', {two: 2});
`
#### Configure evaluation restrictively
jsep-eval exposes the objects the allowed expression types
`javascript
const types = jsepEval.types;
`
So it is possible to dis-allow a given expression type by removing it from this array:
`javascript
const types = jsepEval.types;
evaluate('2 + 2'); // returns 4
delete types.BINARY;
evaluate('2 + 2'); // throws error
`
It is also possible to restrict evaluation by operator (both binary and unary):
`javascript
const binaryOps = jsepEval.operators.binary;
const unaryOps = jsepEval.operators.unary;

evaluate('2 === 2'); // returns true
delete binaryOps['==='];
evaluate('2 === 2'); // throws error

evaluate('!false'); // returns true
unaryOps['!'] = () => 'bob';
evaluate('!false'); // returns 'bob'
``

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jsep-eval is under the MIT license. See LICENSE file.