Function findWordEndInLine

packages/cli/src/ui/components/shared/text-buffer.ts:155–245

(line: string, col: number)

// Find word end within a line
export const findWordEndInLine = (line: string, col: number): number | null => {
  const chars = toCodePoints(line);
  let i = col;

  // If we're already at the end of a word (including punctuation sequences), advance to next word
  // This includes both regular word endings and script boundaries
  const atEndOfWordChar =
    i < chars.length &&
    isWordCharWithCombining(chars[i]) &&
    (i + 1 >= chars.length ||
      !isWordCharWithCombining(chars[i + 1]) ||
      (isWordCharStrict(chars[i]) &&
        i + 1 < chars.length &&
        isWordCharStrict(chars[i + 1]) &&
        isDifferentScript(chars[i], chars[i + 1])));

  const atEndOfPunctuation =
    i < chars.length &&
    !isWordCharWithCombining(chars[i]) &&
    !isWhitespace(chars[i]) &&
    (i + 1 >= chars.length ||
      isWhitespace(chars[i + 1]) ||
      isWordCharWithCombining(chars[i + 1]));

  if (atEndOfWordChar || atEndOfPunctuation) {
    // We're at the end of a word or punctuation sequence, move forward to find next word
    i++;
    // Skip whitespace to find next word or punctuation
    while (i < chars.length && isWhitespace(chars[i])) {
      i++;
    }
  }

  // If we're not on a word character, find the next word or punctuation sequence
  if (i < chars.length && !isWordCharWithCombining(chars[i])) {
    // Skip whitespace to find next word or punctuation
    while (i < chars.length && isWhitespace(chars[i])) {
      i++;
    }
  }

  // Move to end of current word (including combining marks, but stop at script boundaries)
  let foundWord = false;
  let lastBaseCharPos = -1;

  if (i < chars.length && isWordCharWithCombining(chars[i])) {
    // Handle word characters
    while (i < chars.length && isWordCharWithCombining(chars[i])) {
      foundWord = true;

      // Track the position of the last base character (not combining mark)
      if (isWordCharStrict(chars[i])) {
        lastBaseCharPos = i;
      }

      // Check if next character is from a different script (word boundary)
      if (
        i + 1 < chars.length &&