Function getWordRange

packages/editor/src/utils/text.ts:161–207

(text: string, offset: number)

}

export const getWordRange = (text: string, offset: number) => {
  if (!text) return [0, 0]
  offset = Math.min(offset, text.length)

  let previousChar = getCharFromGraphemeBreaker(text, offset, true)
  let nextChar = getCharFromGraphemeBreaker(text, offset)

  let backwardOffset = offset - 1
  let forwardOffset = offset + 1
  if (!nextChar) {
    return [offset, offset]
  }
  if (previousChar && equalOfCharacterType(previousChar, nextChar)) {
    for (; backwardOffset >= 0; ) {
      const backwardChar = getCharFromGraphemeBreaker(text, backwardOffset, true)
      if (equalOfCharacterType(previousChar, backwardChar)) {
        backwardOffset -= backwardChar.length
      } else break
    }
  } else {
    backwardOffset = offset
  }

  for (; forwardOffset < text.length; ) {
    const forwardChar = getCharFromGraphemeBreaker(text, forwardOffset)
    if (equalOfCharacterType(nextChar, forwardChar)) {
      forwardOffset += forwardChar.length
    } else break
  }
  // split word
  if (forwardOffset - backwardOffset > 1) {
    const newText = text.substring(backwardOffset, forwardOffset)
    const { text: wordText, offset: wordOffset } = splitTextOfWord(newText, segments => {
      for (let i = segments.length - 1; i >= 0; i--) {
        const segment = segments[i]
        const wordStart = segment.index + backwardOffset
        if (offset >= wordStart && offset < wordStart + segment.segment.length) {
          return segment
        }
      }
      return segments[0]
    })
    backwardOffset += wordOffset
    forwardOffset = wordText.length + backwardOffset
  }
  return [backwardOffset, forwardOffset]
}

/**
 * @zh-CN 获取在Text节点处鼠标点击坐标时的字符索引