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export default class Completion {
constructor(completions) {
if (typeof completions.length !== 'number') {
throw new TypeError('completions does not have a length in number');
}
this.completions = completions;
this.index = 0;
}
prev() {
let length = this.completions.length;
if (length === 0) {
return null;
}
this.index = (this.index + length - 1) % length;
return this.completions[this.index];
}
next() {
if (this.completions.length === 0) {
return null;
}
let item = this.completions[this.index];
this.index = (this.index + 1) % this.completions.length;
return item;
}
}
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