Function calculateWindow

app/utilities/search.ts:40–67

()

  };

  const calculateWindow = (): { start: number; end: number } => {
    if (stringValue.length <= windowSize) {
      return { start: 0, end: stringValue.length };
    }

    const largestMatch = matchingIndices.reduce(
      (largestMatch, match) => {
        if (match.end - match.start > largestMatch.end - largestMatch.start) {
          return match;
        }

        return largestMatch;
      },
      { start: 0, end: 0 }
    );

    const largestMatchLength = largestMatch.end - largestMatch.start;

    const start =
      largestMatch.start - Math.floor(windowSize / 2 - largestMatchLength / 2);
    const end =
      largestMatch.end + Math.floor(windowSize / 2 - largestMatchLength / 2);

    return {
      start: Math.max(start, 0),
      end: Math.min(end, stringValue.length),
    };
  };

  const window = calculateWindow();