commit
2cbdc483b7
9 changed files with 291 additions and 31 deletions
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export default class Completion { |
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constructor(completions) { |
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if (typeof completions.length !== 'number') { |
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throw new TypeError('completions does not have a length in number'); |
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} |
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this.completions = completions |
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this.index = 0; |
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} |
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prev() { |
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if (this.completions.length === 0) { |
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return null; |
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} |
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this.index = (this.index + this.completions.length - 1) % this.completions.length |
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return this.completions[this.index]; |
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} |
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next() { |
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if (this.completions.length === 0) { |
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return null; |
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} |
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let item = this.completions[this.index]; |
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this.index = (this.index + 1) % this.completions.length |
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return item; |
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} |
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} |
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import { expect } from "chai"; |
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import Completion from '../../src/console/completion'; |
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describe('Completion class', () => { |
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describe('#constructor', () => { |
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it('creates new object by iterable items', () => { |
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new Completion([1,2,3,4,5]); |
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new Completion([]); |
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new Completion('hello'); |
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new Completion(''); |
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}); |
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it('creates new object by iterable items', () => { |
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expect(() => new Completion({ key: 'value' })).to.throw(TypeError); |
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expect(() => new Completion(12345)).to.throw(TypeError); |
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}); |
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}); |
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describe('#next', () => { |
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it('complete next items', () => { |
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let completion = new Completion([3, 4, 5]); |
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expect(completion.next()).to.equal(3); |
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expect(completion.next()).to.equal(4); |
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expect(completion.next()).to.equal(5); |
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expect(completion.next()).to.equal(3); |
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}); |
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it('returns null when empty completions', () => { |
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let completion = new Completion([]); |
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expect(completion.next()).to.be.null; |
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}); |
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}); |
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describe('#prev', () => { |
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it('complete prev items', () => { |
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let completion = new Completion([3, 4, 5]); |
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expect(completion.prev()).to.equal(5); |
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expect(completion.prev()).to.equal(4); |
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expect(completion.prev()).to.equal(3); |
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expect(completion.prev()).to.equal(5); |
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}); |
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it('returns null when empty completions', () => { |
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let completion = new Completion([]); |
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expect(completion.prev()).to.be.null; |
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}); |
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}); |
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}); |
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