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"use strict";

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

var _browserslist = _interopRequireDefault(require("browserslist"));

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

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

const regexLowerCaseUPrefix = /^u(?=\+)/;

function unicode(range) {
  const values = range.slice(2).split('-');

  if (values.length < 2) {
    return range;
  }

  const left = values[0].split('');
  const right = values[1].split('');

  if (left.length !== right.length) {
    return range;
  }

  let questionCounter = 0;
  const merged = left.reduce((group, value, index) => {
    if (group === false) {
      return false;
    }

    if (value === right[index] && !questionCounter) {
      return group + value;
    }

    if (value === '0' && right[index] === 'f') {
      questionCounter++;
      return group + '?';
    }

    return false;
  }, 'u+'); // The maximum number of wildcard characters (?) for ranges is 5.

  if (merged && questionCounter < 6) {
    return merged;
  }

  return range;
}
/*
 * IE and Edge before 16 version ignore the unicode-range if the 'U' is lowercase
 *
 * https://caniuse.com/#search=unicode-range
 */


function hasLowerCaseUPrefixBug(browser) {
  return ~(0, _browserslist.default)('ie <=11, edge <= 15').indexOf(browser);
}

function transform(value, isLegacy = false) {
  return (0, _postcssValueParser.default)(value).walk(child => {
    if (child.type === 'unicode-range') {
      const transformed = unicode(child.value.toLowerCase());
      child.value = isLegacy ? transformed.replace(regexLowerCaseUPrefix, 'U') : transformed;
    }

    return false;
  }).toString();
}

function pluginCreator() {
  return {
    postcssPlugin: 'postcss-normalize-unicode',

    prepare(result) {
      const cache = {};
      const resultOpts = result.opts || {};
      const browsers = (0, _browserslist.default)(null, {
        stats: resultOpts.stats,
        path: __dirname,
        env: resultOpts.env
      });
      const isLegacy = browsers.some(hasLowerCaseUPrefixBug);
      return {
        OnceExit(css) {
          css.walkDecls(/^unicode-range$/i, decl => {
            const value = decl.value;

            if (cache[value]) {
              decl.value = cache[value];
              return;
            }

            const newValue = transform(value, isLegacy);
            decl.value = newValue;
            cache[value] = newValue;
          });
        }

      };
    }

  };
}

pluginCreator.postcss = true;
var _default = pluginCreator;
exports.default = _default;
module.exports = exports.default;