90 lines
2.4 KiB
TypeScript
90 lines
2.4 KiB
TypeScript
// SPDX-FileCopyrightText: 2022 Johannes Loher
|
|
//
|
|
// SPDX-License-Identifier: MIT
|
|
|
|
import { describe, expect, it } from 'vitest';
|
|
|
|
import { defaultEvaluator, Evaluator, mathEvaluator } from '../../src/expression-evaluation/evaluator';
|
|
|
|
describe('Evaluator', () => {
|
|
it('evaluates expressions that only use identifiers according to the given predicate', () => {
|
|
// given
|
|
const expression = "typeof 'foo' === 'string' ? 42 : null";
|
|
|
|
// when
|
|
const result = defaultEvaluator.evaluate(expression);
|
|
|
|
// then
|
|
expect(result).toEqual(42);
|
|
});
|
|
|
|
it('fails to evaluate expressions that contain identifiers that are not allowed by the predicate', () => {
|
|
// given
|
|
const expression = "typeof 'foo' === 'string' ? 42 : function (){}";
|
|
|
|
// when
|
|
const evaluate = () => defaultEvaluator.evaluate(expression);
|
|
|
|
// then
|
|
expect(evaluate).toThrowError("'function' is not an allowed identifier.");
|
|
});
|
|
|
|
it('fails to evaluate expressions that contain invalid tokens', () => {
|
|
// given
|
|
const expression = '1;';
|
|
|
|
// when
|
|
const evaluate = () => defaultEvaluator.evaluate(expression);
|
|
|
|
// then
|
|
expect(evaluate).toThrowError('Invalid or unexpected token (1)');
|
|
});
|
|
|
|
it('fails to evaluate expressions that contain arrow functions', () => {
|
|
// given
|
|
const expression = '(() => 1)()';
|
|
|
|
// when
|
|
const evaluate = () => defaultEvaluator.evaluate(expression);
|
|
|
|
// then
|
|
expect(evaluate).toThrowError('Invalid or unexpected token (4)');
|
|
});
|
|
|
|
it('makes the given context available', () => {
|
|
// given
|
|
const context = { floor: Math.floor };
|
|
const evaluator = new Evaluator({ context });
|
|
const expression = 'floor(0.5)';
|
|
|
|
// when
|
|
const result = evaluator.evaluate(expression);
|
|
|
|
// then
|
|
expect(result).toEqual(0);
|
|
});
|
|
|
|
describe('mathEvaluator', () => {
|
|
it('makes the given context available', () => {
|
|
// given
|
|
const expression = 'sqrt(sin(PI))';
|
|
|
|
// when
|
|
const result = mathEvaluator.evaluate(expression);
|
|
|
|
// then
|
|
expect(result).toEqual(Math.sqrt(Math.sin(Math.PI)));
|
|
});
|
|
|
|
it('does not give acces to the function constructor', () => {
|
|
// given
|
|
const expression = 'sqrt.constructor';
|
|
|
|
// when
|
|
const evaluate = () => mathEvaluator.evaluate(expression);
|
|
|
|
// then
|
|
expect(evaluate).toThrowError("'constructor' is not an allowed identifier.");
|
|
});
|
|
});
|
|
});
|