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Filename : isStandardSyntaxCombinator.js

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/* @flow */
"use strict";

/**
 * Check whether a combinator is standard
 *
 * @param {Node} postcss-selector-parser node (of type combinator)
 * @return {boolean} If `true`, the combinator is standard
 */

const _ = require("lodash");

module.exports = function(node /*: Object*/) /*: boolean*/ {
  // Ghost descendant combinators around reference combinators like `/deep/`
  // postcss-selector-parser parsers references combinators as tag selectors surrounded
  // by descendant combinators
  if (
    (node.prev() &&
      node.prev().type === "tag" &&
      _.startsWith(node.prev().value, "/") &&
      _.endsWith(node.prev().value, "/")) ||
    (node.next() &&
      node.next().type === "tag" &&
      _.startsWith(node.next().value, "/") &&
      _.endsWith(node.next().value, "/"))
  ) {
    return false;
  }

  return true;
};