Function calculateSimilarity

Source

export function calculateSimilarity(
  str1: string,
  str2: string,
  config: Partial<MatchEngineConfig> = {},
): number {
  const { caseSensitive } = { ...DEFAULT_MATCH_CONFIG, ...config };

  if (!str1 || !str2) return 0;
  if (str1 === str2) return 100;

  const s1 = normalizeString(str1, caseSensitive);
  const s2 = normalizeString(str2, caseSensitive);

  if (s1 === s2) return 100;
  if (s1.length < 2 || s2.length < 2) return 0;

  // Exact substring check (one is contained within the other)
  if (s1.includes(s2) || s2.includes(s1)) {
    const longerLength = Math.max(s1.length, s2.length);
    const shorterLength = Math.min(s1.length, s2.length);
    return Math.round((shorterLength / longerLength) * 100);
  }

  // String similarity calculation using Dice coefficient
  const similarity = stringSimilarity.compareTwoStrings(s1, s2);
  return Math.round(similarity * 100);
}
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