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"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;

var _postcss = require("postcss");

var _postcssValueParser = require("postcss-value-parser");

var _stylehacks = require("stylehacks");

var _canMerge = _interopRequireDefault(require("../canMerge"));

var _getDecls = _interopRequireDefault(require("../getDecls"));

var _getValue = _interopRequireDefault(require("../getValue"));

var _mergeRules = _interopRequireDefault(require("../mergeRules"));

var _insertCloned = _interopRequireDefault(require("../insertCloned"));

var _remove = _interopRequireDefault(require("../remove"));

var _isCustomProp = _interopRequireDefault(require("../isCustomProp"));

var _canExplode = _interopRequireDefault(require("../canExplode"));

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

const properties = ['column-width', 'column-count'];
const auto = 'auto';
const inherit = 'inherit';
/**
 * Normalize a columns shorthand definition. Both of the longhand
 * properties' initial values are 'auto', and as per the spec,
 * omitted values are set to their initial values. Thus, we can
 * remove any 'auto' definition when there are two values.
 *
 * Specification link: https://www.w3.org/TR/css3-multicol/
 */

function normalize(values) {
  if (values[0].toLowerCase() === auto) {
    return values[1];
  }

  if (values[1].toLowerCase() === auto) {
    return values[0];
  }

  if (values[0].toLowerCase() === inherit && values[1].toLowerCase() === inherit) {
    return inherit;
  }

  return values.join(' ');
}

function explode(rule) {
  rule.walkDecls(/^columns$/i, decl => {
    if (!(0, _canExplode.default)(decl)) {
      return;
    }

    if ((0, _stylehacks.detect)(decl)) {
      return;
    }

    let values = _postcss.list.space(decl.value);

    if (values.length === 1) {
      values.push(auto);
    }

    values.forEach((value, i) => {
      let prop = properties[1];

      if (value.toLowerCase() === auto) {
        prop = properties[i];
      } else if ((0, _postcssValueParser.unit)(value).unit) {
        prop = properties[0];
      }

      (0, _insertCloned.default)(decl.parent, decl, {
        prop,
        value
      });
    });
    decl.remove();
  });
}

function cleanup(rule) {
  let decls = (0, _getDecls.default)(rule, ['columns'].concat(properties));

  while (decls.length) {
    const lastNode = decls[decls.length - 1]; // remove properties of lower precedence

    const lesser = decls.filter(node => !(0, _stylehacks.detect)(lastNode) && !(0, _stylehacks.detect)(node) && node !== lastNode && node.important === lastNode.important && lastNode.prop === 'columns' && node.prop !== lastNode.prop);
    lesser.forEach(_remove.default);
    decls = decls.filter(node => !~lesser.indexOf(node)); // get duplicate properties

    let duplicates = decls.filter(node => !(0, _stylehacks.detect)(lastNode) && !(0, _stylehacks.detect)(node) && node !== lastNode && node.important === lastNode.important && node.prop === lastNode.prop && !(!(0, _isCustomProp.default)(node) && (0, _isCustomProp.default)(lastNode)));
    duplicates.forEach(_remove.default);
    decls = decls.filter(node => node !== lastNode && !~duplicates.indexOf(node));
  }
}

function merge(rule) {
  (0, _mergeRules.default)(rule, properties, (rules, lastNode) => {
    if ((0, _canMerge.default)(rules) && !rules.some(_stylehacks.detect)) {
      (0, _insertCloned.default)(lastNode.parent, lastNode, {
        prop: 'columns',
        value: normalize(rules.map(_getValue.default))
      });
      rules.forEach(_remove.default);
      return true;
    }
  });
  cleanup(rule);
}

var _default = {
  explode,
  merge
};
exports.default = _default;
module.exports = exports.default;