normalizeCasingOfParagraph function

String normalizeCasingOfParagraph(String input)

Normalizes the casing of the input string by processing each sentence.

This function takes a String input and returns a new string with the casing normalized. It processes the input by breaking it into sentences, and then applies casing rules to each sentence.

The function handles various sentence-ending characters (., !, ?, \n) and preserves any non-letter characters in the input.

Implementation

String normalizeCasingOfParagraph(final String input) {
  if (input.isEmpty) {
    return input;
  }

  // Define sentence-ending characters
  const List<String> sentenceEndings = ['.', '!', '?', '\n'];

  StringBuffer result = StringBuffer();
  StringBuffer currentSentence = StringBuffer();

  for (int i = 0; i < input.length; i++) {
    String char = input[i];
    currentSentence.write(char);

    // If the character is a sentence-ending character, process the sentence
    if (sentenceEndings.contains(char)) {
      result.write(normalizeCasingOfSentence(currentSentence.toString()));
      currentSentence.clear();
    }
  }

  // Process any remaining sentence
  if (currentSentence.isNotEmpty) {
    result.write(normalizeCasingOfSentence(currentSentence.toString()));
  }

  return result.toString();
}