import { Editor, Location, Range } from 'slate';
import { getPointBefore, GetPointBeforeOptions } from './getPointBefore';

export type GetRangeBeforeOptions = GetPointBeforeOptions;

/**
 * Get range from {@link getPointBefore} to the end point of `at`.
 */
export function getRangeBefore(editor: Editor, at: Location, options?: GetRangeBeforeOptions): Range | undefined {
  const anchor = getPointBefore(editor, at, options);

  if (anchor) {
    const focus = Editor.start(editor, at);

    return {
      anchor,
      focus
    };
  }
}