mirror of
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100 lines
3.2 KiB
JavaScript
100 lines
3.2 KiB
JavaScript
const chai = require('chai')
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const expect = chai.expect
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const syntax = require('../../src/syntax.js')
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const Scope = require('../../src/scope.js')
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const evalExp = syntax.evalExp
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const evalValue = syntax.evalValue
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const isTruthy = syntax.isTruthy
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describe('expression', function () {
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let scope
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beforeEach(function () {
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scope = Scope.factory({
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one: 1,
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two: 2,
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empty: '',
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x: 'XXX',
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y: undefined,
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z: null,
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'has_value?': true
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})
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})
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describe('.evalValue()', function () {
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it('should eval literals', function () {
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expect(evalValue('2.3')).to.equal(2.3)
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expect(evalValue('"foo"')).to.equal('foo')
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})
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it('should eval variables', function () {
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expect(evalValue('23', scope)).to.equal(23)
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expect(evalValue('one', scope)).to.equal(1)
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expect(evalValue('has_value?', scope)).to.equal(true)
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expect(evalValue('x', scope)).to.equal('XXX')
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})
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it('should throw if not valid', function () {
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const fn = () => evalValue('===')
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expect(fn).to.throw("cannot eval '===' as value")
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})
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})
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describe('.isTruthy()', function () {
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// Spec: https://shopify.github.io/liquid/basics/truthy-and-falsy/
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expect(isTruthy(true)).to.be.true
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expect(isTruthy(false)).to.be.false
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expect(isTruthy(null)).to.be.false
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expect(isTruthy('foo')).to.be.true
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expect(isTruthy('')).to.be.true
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expect(isTruthy(0)).to.be.true
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expect(isTruthy(1)).to.be.true
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expect(isTruthy(1.1)).to.be.true
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expect(isTruthy([1])).to.be.true
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expect(isTruthy([])).to.be.true
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})
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describe('.evalExp()', function () {
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it('should throw when scope undefined', function () {
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expect(function () {
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evalExp('')
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}).to.throw(/scope undefined/)
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})
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it('should eval simple expression', function () {
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expect(evalExp('1<2', scope)).to.equal(true)
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expect(evalExp('2<=2', scope)).to.equal(true)
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expect(evalExp('one<=two', scope)).to.equal(true)
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expect(evalExp('x contains "x"', scope)).to.equal(false)
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expect(evalExp('x contains "X"', scope)).to.equal(true)
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expect(evalExp('1 contains "x"', scope)).to.equal(false)
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expect(evalExp('y contains "x"', scope)).to.equal(false)
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expect(evalExp('z contains "x"', scope)).to.equal(false)
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expect(evalExp('(1..5) contains 3', scope)).to.equal(true)
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expect(evalExp('(1..5) contains 6', scope)).to.equal(false)
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expect(evalExp('"<=" == "<="', scope)).to.equal(true)
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})
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describe('complex expression', function () {
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it('should support value or value', function () {
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expect(evalExp('false or true', scope)).to.equal(true)
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})
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it('should support < and contains', function () {
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expect(evalExp('1<2 and x contains "x"', scope)).to.equal(false)
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})
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it('should support < or contains', function () {
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expect(evalExp('1<2 or x contains "x"', scope)).to.equal(true)
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})
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it('should support value and !=', function () {
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expect(evalExp('empty and empty != ""', scope)).to.equal(false)
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})
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})
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it('should eval range expression', function () {
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expect(evalExp('(2..4)', scope)).to.deep.equal([2, 3, 4])
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expect(evalExp('(two..4)', scope)).to.deep.equal([2, 3, 4])
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})
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})
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})
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