Function getCloseWord

packages/shared/src/lib/textarea.ts:45–73

(
  textarea: HTMLTextAreaElement,
  selected: number[],
)

};

export const getCloseWord = (
  textarea: HTMLTextAreaElement,
  selected: number[],
): [string, number] => {
  const [, end] = selected;
  const index = textarea.value.substring(0, end).split('\n').length - 1;
  const lines = textarea.value.split('\n');
  const line = lines[index];
  const preLines = lines.slice(0, index).join('\n');
  const offset = index === 0 ? 0 : 1;
  const base = end - preLines.length - offset;
  let lastIndex = 0;
  let startIndex = 0;

  const found = line.split(' ').find((word) => {
    startIndex = lastIndex;
    const current = lastIndex + word.length;

    if (current >= base) {
      return true;
    }

    lastIndex = current + 1;

    return false;
  });

  return [found ?? '', preLines.length + startIndex + offset];
};

/**
 * Enum to describe the current cursor's state.