node_modules/postcss-merge-rules/dist/lib/ensureCompatibility.js

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.ensureCompatibility = ensureCompatibility;
exports.noVendor = noVendor;
exports.pseudoElements = void 0;
exports.sameVendor = sameVendor;

var _caniuseApi = require("caniuse-api");

var _postcssSelectorParser = _interopRequireDefault(require("postcss-selector-parser"));

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

const simpleSelectorRe = /^#?[-._a-z0-9 ]+$/i;
const cssSel2 = 'css-sel2';
const cssSel3 = 'css-sel3';
const cssGencontent = 'css-gencontent';
const cssFirstLetter = 'css-first-letter';
const cssFirstLine = 'css-first-line';
const cssInOutOfRange = 'css-in-out-of-range';
const formValidation = 'form-validation';
const vendorPrefix = /-(ah|apple|atsc|epub|hp|khtml|moz|ms|o|rim|ro|tc|wap|webkit|xv)-/;
/**
 * @param {string} selector
 * @return {string[]}
 */

function filterPrefixes(selector) {
  return selector.match(vendorPrefix);
} // Internet Explorer use :-ms-input-placeholder.
// Microsoft Edge use ::-ms-input-placeholder.


const findMsInputPlaceholder = selector => ~selector.search(/-ms-input-placeholder/i);

function sameVendor(selectorsA, selectorsB) {
  let same = selectors => selectors.map(filterPrefixes).join();

  let findMsVendor = selectors => selectors.find(findMsInputPlaceholder);

  return same(selectorsA) === same(selectorsB) && !(findMsVendor(selectorsA) && findMsVendor(selectorsB));
}
/**
 * @param {string} selector
 * @return {boolean}
 */


function noVendor(selector) {
  return !vendorPrefix.test(selector);
}

const pseudoElements = {
  ':active': cssSel2,
  ':after': cssGencontent,
  ':any-link': 'css-any-link',
  ':before': cssGencontent,
  ':checked': cssSel3,
  ':default': 'css-default-pseudo',
  ':dir': 'css-dir-pseudo',
  ':disabled': cssSel3,
  ':empty': cssSel3,
  ':enabled': cssSel3,
  ':first-child': cssSel2,
  ':first-letter': cssFirstLetter,
  ':first-line': cssFirstLine,
  ':first-of-type': cssSel3,
  ':focus': cssSel2,
  ':focus-within': 'css-focus-within',
  ':focus-visible': 'css-focus-visible',
  ':has': 'css-has',
  ':hover': cssSel2,
  ':in-range': cssInOutOfRange,
  ':indeterminate': 'css-indeterminate-pseudo',
  ':invalid': formValidation,
  ':is': 'css-matches-pseudo',
  ':lang': cssSel2,
  ':last-child': cssSel3,
  ':last-of-type': cssSel3,
  ':link': cssSel2,
  ':matches': 'css-matches-pseudo',
  ':not': cssSel3,
  ':nth-child': cssSel3,
  ':nth-last-child': cssSel3,
  ':nth-last-of-type': cssSel3,
  ':nth-of-type': cssSel3,
  ':only-child': cssSel3,
  ':only-of-type': cssSel3,
  ':optional': 'css-optional-pseudo',
  ':out-of-range': cssInOutOfRange,
  ':placeholder-shown': 'css-placeholder-shown',
  ':required': formValidation,
  ':root': cssSel3,
  ':target': cssSel3,
  '::after': cssGencontent,
  '::backdrop': 'dialog',
  '::before': cssGencontent,
  '::first-letter': cssFirstLetter,
  '::first-line': cssFirstLine,
  '::marker': 'css-marker-pseudo',
  '::placeholder': 'css-placeholder',
  '::selection': 'css-selection',
  ':valid': formValidation,
  ':visited': cssSel2
};
exports.pseudoElements = pseudoElements;

function isCssMixin(selector) {
  return selector[selector.length - 1] === ':';
}

function isHostPseudoClass(selector) {
  return selector.includes(':host');
}

const isSupportedCache = new Map(); // Move to util in future

function isSupportedCached(feature, browsers) {
  const key = JSON.stringify({
    feature,
    browsers
  });
  let result = isSupportedCache.get(key);

  if (!result) {
    result = (0, _caniuseApi.isSupported)(feature, browsers);
    isSupportedCache.set(key, result);
  }

  return result;
}

function ensureCompatibility(selectors, browsers, compatibilityCache) {
  // Should not merge mixins
  if (selectors.some(isCssMixin)) {
    return false;
  } // Should not merge :host selector https://github.com/angular/angular-cli/issues/18672


  if (selectors.some(isHostPseudoClass)) {
    return false;
  }

  return selectors.every(selector => {
    if (simpleSelectorRe.test(selector)) {
      return true;
    }

    if (compatibilityCache && compatibilityCache.has(selector)) {
      return compatibilityCache.get(selector);
    }

    let compatible = true;
    (0, _postcssSelectorParser.default)(ast => {
      ast.walk(node => {
        const {
          type,
          value
        } = node;

        if (type === 'pseudo') {
          const entry = pseudoElements[value];

          if (!entry && noVendor(value)) {
            compatible = false;
          }

          if (entry && compatible) {
            compatible = isSupportedCached(entry, browsers);
          }
        }

        if (type === 'combinator') {
          if (~value.indexOf('~')) {
            compatible = isSupportedCached(cssSel3, browsers);
          }

          if (~value.indexOf('>') || ~value.indexOf('+')) {
            compatible = isSupportedCached(cssSel2, browsers);
          }
        }

        if (type === 'attribute' && node.attribute) {
          // [foo]
          if (!node.operator) {
            compatible = isSupportedCached(cssSel2, browsers);
          }

          if (value) {
            // [foo="bar"], [foo~="bar"], [foo|="bar"]
            if (~['=', '~=', '|='].indexOf(node.operator)) {
              compatible = isSupportedCached(cssSel2, browsers);
            } // [foo^="bar"], [foo$="bar"], [foo*="bar"]


            if (~['^=', '$=', '*='].indexOf(node.operator)) {
              compatible = isSupportedCached(cssSel3, browsers);
            }
          } // [foo="bar" i]


          if (node.insensitive) {
            compatible = isSupportedCached('css-case-insensitive', browsers);
          }
        }

        if (!compatible) {
          // If this node was not compatible,
          // break out early from walking the rest
          return false;
        }
      });
    }).processSync(selector);

    if (compatibilityCache) {
      compatibilityCache.set(selector, compatible);
    }

    return compatible;
  });
}