Function getWordBackward

packages/editor/src/utils/text.ts:119–134

(text: string, offset: number)

}

export const getWordBackward = (text: string, offset: number) => {
  let currentChar = getCharFromGraphemeBreaker(text, offset, true)
  let backwardOffset = offset - 1
  for (; backwardOffset >= 0; ) {
    const backwardChar = getCharFromGraphemeBreaker(text, backwardOffset, true)
    if (equalOfCharacterType(currentChar, backwardChar)) {
      backwardOffset -= backwardChar.length
    } else break
  }
  if (offset - backwardOffset > 1) {
    const wordText = text.substring(backwardOffset, offset)
    const { offset: wordOffset } = splitTextOfWord(wordText)
    backwardOffset += wordOffset
  }
  return text.substring(backwardOffset < 0 ? 0 : backwardOffset, offset)
}

export const getWordOffsetBackward = (text: string, offset: number) => {
  return offset - getWordBackward(text, offset).length