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

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

import { AFFINITY_CALCULATION_STRATEGY } from "../../enums";
/**
 * Calculates an affinity score based on the specified strategy.
 */
export function calculateAffinityOfMask(strategy, mask, text) {
  switch (strategy) {
    case AFFINITY_CALCULATION_STRATEGY.WHOLE_STRING:
      {
        const result = mask.apply(text);
        return result.affinity;
      }
    case AFFINITY_CALCULATION_STRATEGY.PREFIX:
      {
        const result = mask.apply(text);
        return prefixIntersection(result.formattedText.string, text.string).length;
      }
    case AFFINITY_CALCULATION_STRATEGY.CAPACITY:
      {
        if (text.string.length > mask.totalTextLength()) {
          return Number.MIN_SAFE_INTEGER;
        }
        return text.string.length - mask.totalTextLength();
      }
    case AFFINITY_CALCULATION_STRATEGY.EXTRACTED_VALUE_CAPACITY:
      {
        const result = mask.apply(text);
        const extractedValueLength = result.extractedValue.length;
        if (extractedValueLength > mask.totalValueLength()) {
          return Number.MIN_SAFE_INTEGER;
        }
        return extractedValueLength - mask.totalValueLength();
      }
    default:
      return 0;
  }
}

/**
 * Finds common prefix between two strings.
 */
function prefixIntersection(str1, str2) {
  if (!str1 || !str2) {
    return "";
  }
  let endIndex = 0;
  while (endIndex < str1.length && endIndex < str2.length) {
    if (str1[endIndex] !== str2[endIndex]) {
      break;
    }
    endIndex++;
  }
  return str1.substring(0, endIndex);
}
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