Function getOperatorRange

source code/vim/operators.ts:431–477

(
  cursor: Cursor,
  target: Cursor,
  motion: string,
  op: Operator,
  count: number,
)

}

function getOperatorRange(
  cursor: Cursor,
  target: Cursor,
  motion: string,
  op: Operator,
  count: number,
): { from: number; to: number; linewise: boolean } {
  let from = Math.min(cursor.offset, target.offset)
  let to = Math.max(cursor.offset, target.offset)
  let linewise = false

  // Special case: cw/cW changes to end of word, not start of next word
  if (op === 'change' && (motion === 'w' || motion === 'W')) {
    // For cw with count, move forward (count-1) words, then find end of that word
    let wordCursor = cursor
    for (let i = 0; i < count - 1; i++) {
      wordCursor =
        motion === 'w' ? wordCursor.nextVimWord() : wordCursor.nextWORD()
    }
    const wordEnd =
      motion === 'w' ? wordCursor.endOfVimWord() : wordCursor.endOfWORD()
    to = cursor.measuredText.nextOffset(wordEnd.offset)
  } else if (isLinewiseMotion(motion)) {
    // Linewise motions extend to include entire lines
    linewise = true
    const text = cursor.text
    const nextNewline = text.indexOf('\n', to)
    if (nextNewline === -1) {
      // Deleting to end of file - include the preceding newline if exists
      to = text.length
      if (from > 0 && text[from - 1] === '\n') {
        from -= 1
      }
    } else {
      to = nextNewline + 1
    }
  } else if (isInclusiveMotion(motion) && cursor.offset <= target.offset) {
    to = cursor.measuredText.nextOffset(to)
  }

  // Word motions can land inside an [Image #N] chip; extend the range to
  // cover the whole chip so dw/cw/yw never leave a partial placeholder.
  from = cursor.snapOutOfImageRef(from, 'start')
  to = cursor.snapOutOfImageRef(to, 'end')

  return { from, to, linewise }
}

/**
 * Get the range for a find-based operator.