@material-ui/lab/es/Pagination/usePagination.js

import _extends from "@babel/runtime/helpers/esm/extends";
import _objectWithoutPropertiesLoose from "@babel/runtime/helpers/esm/objectWithoutPropertiesLoose";
import { useControlled } from '@material-ui/core/utils';
export default function usePagination(props = {}) {
  // keep default values in sync with @default tags in Pagination.propTypes
  const {
    boundaryCount = 1,
    componentName = 'usePagination',
    count = 1,
    defaultPage = 1,
    disabled = false,
    hideNextButton = false,
    hidePrevButton = false,
    onChange: handleChange,
    page: pageProp,
    showFirstButton = false,
    showLastButton = false,
    siblingCount = 1
  } = props,
        other = _objectWithoutPropertiesLoose(props, ["boundaryCount", "componentName", "count", "defaultPage", "disabled", "hideNextButton", "hidePrevButton", "onChange", "page", "showFirstButton", "showLastButton", "siblingCount"]);

  const [page, setPageState] = useControlled({
    controlled: pageProp,
    default: defaultPage,
    name: componentName,
    state: 'page'
  });

  const handleClick = (event, value) => {
    if (!pageProp) {
      setPageState(value);
    }

    if (handleChange) {
      handleChange(event, value);
    }
  }; // https://dev.to/namirsab/comment/2050


  const range = (start, end) => {
    const length = end - start + 1;
    return Array.from({
      length
    }, (_, i) => start + i);
  };

  const startPages = range(1, Math.min(boundaryCount, count));
  const endPages = range(Math.max(count - boundaryCount + 1, boundaryCount + 1), count);
  const siblingsStart = Math.max(Math.min( // Natural start
  page - siblingCount, // Lower boundary when page is high
  count - boundaryCount - siblingCount * 2 - 1), // Greater than startPages
  boundaryCount + 2);
  const siblingsEnd = Math.min(Math.max( // Natural end
  page + siblingCount, // Upper boundary when page is low
  boundaryCount + siblingCount * 2 + 2), // Less than endPages
  endPages[0] - 2); // Basic list of items to render
  // e.g. itemList = ['first', 'previous', 1, 'ellipsis', 4, 5, 6, 'ellipsis', 10, 'next', 'last']

  const itemList = [...(showFirstButton ? ['first'] : []), ...(hidePrevButton ? [] : ['previous']), ...startPages, // Start ellipsis
  // eslint-disable-next-line no-nested-ternary
  ...(siblingsStart > boundaryCount + 2 ? ['start-ellipsis'] : boundaryCount + 1 < count - boundaryCount ? [boundaryCount + 1] : []), // Sibling pages
  ...range(siblingsStart, siblingsEnd), // End ellipsis
  // eslint-disable-next-line no-nested-ternary
  ...(siblingsEnd < count - boundaryCount - 1 ? ['end-ellipsis'] : count - boundaryCount > boundaryCount ? [count - boundaryCount] : []), ...endPages, ...(hideNextButton ? [] : ['next']), ...(showLastButton ? ['last'] : [])]; // Map the button type to its page number

  const buttonPage = type => {
    switch (type) {
      case 'first':
        return 1;

      case 'previous':
        return page - 1;

      case 'next':
        return page + 1;

      case 'last':
        return count;

      default:
        return null;
    }
  }; // Convert the basic item list to PaginationItem props objects


  const items = itemList.map(item => {
    return typeof item === 'number' ? {
      onClick: event => {
        handleClick(event, item);
      },
      type: 'page',
      page: item,
      selected: item === page,
      disabled,
      'aria-current': item === page ? 'true' : undefined
    } : {
      onClick: event => {
        handleClick(event, buttonPage(item));
      },
      type: item,
      page: buttonPage(item),
      selected: false,
      disabled: disabled || item.indexOf('ellipsis') === -1 && (item === 'next' || item === 'last' ? page >= count : page <= 1)
    };
  });
  return _extends({
    items
  }, other);
}