Function findCurrentLineRange

packages/editor/src/utils/lines.ts:29–56

(editor: Editable, parentRange: Range)

 * @returns {Range} A valid portion of the parentRange which is one a single line
 */
export const findCurrentLineRange = (editor: Editable, parentRange: Range): Range => {
  const parentRangeBoundary = Editor.range(editor, Range.end(parentRange))
  const positions = Array.from(Editor.positions(editor, { at: parentRange }))

  let left = 0
  let right = positions.length
  let middle = Math.floor(right / 2)

  if (areRangesSameLine(editor, Editor.range(editor, positions[left]), parentRangeBoundary)) {
    return Editor.range(editor, positions[left], parentRangeBoundary)
  }

  if (positions.length < 2) {
    return Editor.range(editor, positions[positions.length - 1], parentRangeBoundary)
  }

  while (middle !== positions.length && middle !== left) {
    if (areRangesSameLine(editor, Editor.range(editor, positions[middle]), parentRangeBoundary)) {
      right = middle
    } else {
      left = middle
    }

    middle = Math.floor((left + right) / 2)
  }

  return Editor.range(editor, positions[right], parentRangeBoundary)
}