react-native-advanced-input-mask/lib/module/web/helper/CaretStringIterator.js

Text input mask for React Native on iOS, Android and web. Synchronous and easy formatting without hustle

import { CaretGravityType } from "../model/types";
class CaretStringIterator {
  constructor(caretString, currentIndex = 0) {
    this.caretString = caretString;
    this.currentIndex = currentIndex;
  }
  insertionAffectsCaret() {
    const {
      caretGravity,
      caretPosition
    } = this.caretString;
    const isBackwardGravity = caretGravity.type === CaretGravityType.Backward;
    return isBackwardGravity ? this.currentIndex <= caretPosition : this.currentIndex < caretPosition;
  }
  deletionAffectsCaret = () => this.currentIndex < this.caretString.caretPosition;
  next() {
    const {
      string
    } = this.caretString;
    if (this.currentIndex >= string.length) {
      return null;
    }
    const char = string.charAt(this.currentIndex);
    this.currentIndex += 1;
    return char;
  }
}
export default CaretStringIterator;
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