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Current File : /var/www/html/node_modules/@popperjs/core/lib/modifiers/offset.js.flow

// @flow
import type { Placement } from '../enums';
import type { ModifierArguments, Modifier, Rect, Offsets } from '../types';
import getBasePlacement from '../utils/getBasePlacement';
import { top, left, right, placements } from '../enums';

// eslint-disable-next-line import/no-unused-modules
export type OffsetsFunction = ({
  popper: Rect,
  reference: Rect,
  placement: Placement,
}) => [?number, ?number];

type Offset = OffsetsFunction | [?number, ?number];

// eslint-disable-next-line import/no-unused-modules
export type Options = {
  offset: Offset,
};

export function distanceAndSkiddingToXY(
  placement: Placement,
  rects: { popper: Rect, reference: Rect },
  offset: Offset
): Offsets {
  const basePlacement = getBasePlacement(placement);
  const invertDistance = [left, top].indexOf(basePlacement) >= 0 ? -1 : 1;

  let [skidding, distance] =
    typeof offset === 'function'
      ? offset({
          ...rects,
          placement,
        })
      : offset;

  skidding = skidding || 0;
  distance = (distance || 0) * invertDistance;

  return [left, right].indexOf(basePlacement) >= 0
    ? { x: distance, y: skidding }
    : { x: skidding, y: distance };
}

function offset({ state, options, name }: ModifierArguments<Options>) {
  const { offset = [0, 0] } = options;

  const data = placements.reduce((acc, placement) => {
    acc[placement] = distanceAndSkiddingToXY(placement, state.rects, offset);
    return acc;
  }, {});

  const { x, y } = data[state.placement];

  if (state.modifiersData.popperOffsets != null) {
    state.modifiersData.popperOffsets.x += x;
    state.modifiersData.popperOffsets.y += y;
  }

  state.modifiersData[name] = data;
}

// eslint-disable-next-line import/no-unused-modules
export type OffsetModifier = Modifier<'offset', Options>;
export default ({
  name: 'offset',
  enabled: true,
  phase: 'main',
  requires: ['popperOffsets'],
  fn: offset,
}: OffsetModifier);

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