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					542 lines
				
				15 KiB
			
		
		
			
		
	
	
					542 lines
				
				15 KiB
			| 
								 
											4 years ago
										 
									 | 
							
								"use strict";
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								var vendor = require('postcss').vendor;
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								var Declaration = require('./declaration');
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								var Resolution = require('./resolution');
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								var Transition = require('./transition');
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								var Processor = require('./processor');
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								var Supports = require('./supports');
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								var Browsers = require('./browsers');
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								var Selector = require('./selector');
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								var AtRule = require('./at-rule');
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								var Value = require('./value');
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								var utils = require('./utils');
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								Selector.hack(require('./hacks/fullscreen'));
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								Selector.hack(require('./hacks/placeholder'));
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								Declaration.hack(require('./hacks/flex'));
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								Declaration.hack(require('./hacks/order'));
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								Declaration.hack(require('./hacks/filter'));
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								Declaration.hack(require('./hacks/grid-end'));
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								Declaration.hack(require('./hacks/animation'));
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								Declaration.hack(require('./hacks/flex-flow'));
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								Declaration.hack(require('./hacks/flex-grow'));
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								Declaration.hack(require('./hacks/flex-wrap'));
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								Declaration.hack(require('./hacks/grid-area'));
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								Declaration.hack(require('./hacks/place-self'));
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								Declaration.hack(require('./hacks/grid-start'));
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								Declaration.hack(require('./hacks/align-self'));
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								Declaration.hack(require('./hacks/appearance'));
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								Declaration.hack(require('./hacks/flex-basis'));
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								Declaration.hack(require('./hacks/mask-border'));
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								Declaration.hack(require('./hacks/mask-composite'));
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								Declaration.hack(require('./hacks/align-items'));
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								Declaration.hack(require('./hacks/flex-shrink'));
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								Declaration.hack(require('./hacks/break-props'));
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								Declaration.hack(require('./hacks/color-adjust'));
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								Declaration.hack(require('./hacks/writing-mode'));
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								Declaration.hack(require('./hacks/border-image'));
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								Declaration.hack(require('./hacks/align-content'));
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								Declaration.hack(require('./hacks/border-radius'));
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								Declaration.hack(require('./hacks/block-logical'));
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								Declaration.hack(require('./hacks/grid-template'));
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								Declaration.hack(require('./hacks/inline-logical'));
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								Declaration.hack(require('./hacks/grid-row-align'));
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								Declaration.hack(require('./hacks/transform-decl'));
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								Declaration.hack(require('./hacks/flex-direction'));
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								Declaration.hack(require('./hacks/image-rendering'));
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								Declaration.hack(require('./hacks/backdrop-filter'));
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								Declaration.hack(require('./hacks/background-clip'));
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								Declaration.hack(require('./hacks/text-decoration'));
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								Declaration.hack(require('./hacks/justify-content'));
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								Declaration.hack(require('./hacks/background-size'));
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								Declaration.hack(require('./hacks/grid-row-column'));
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								Declaration.hack(require('./hacks/grid-rows-columns'));
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								Declaration.hack(require('./hacks/grid-column-align'));
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								Declaration.hack(require('./hacks/overscroll-behavior'));
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								Declaration.hack(require('./hacks/grid-template-areas'));
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								Declaration.hack(require('./hacks/text-emphasis-position'));
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								Declaration.hack(require('./hacks/text-decoration-skip-ink'));
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								Value.hack(require('./hacks/gradient'));
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								Value.hack(require('./hacks/intrinsic'));
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								Value.hack(require('./hacks/pixelated'));
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								Value.hack(require('./hacks/image-set'));
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								Value.hack(require('./hacks/cross-fade'));
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								Value.hack(require('./hacks/display-flex'));
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								Value.hack(require('./hacks/display-grid'));
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								Value.hack(require('./hacks/filter-value'));
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								var declsCache = {};
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								var Prefixes =
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								/*#__PURE__*/
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								function () {
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								  function Prefixes(data, browsers, options) {
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								    if (options === void 0) {
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								      options = {};
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								    }
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								    this.data = data;
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								    this.browsers = browsers;
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								    this.options = options;
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								    var _this$preprocess = this.preprocess(this.select(this.data));
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								    this.add = _this$preprocess[0];
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								    this.remove = _this$preprocess[1];
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								    this.transition = new Transition(this);
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								    this.processor = new Processor(this);
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								  }
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								  /**
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								     * Return clone instance to remove all prefixes
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								     */
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								  var _proto = Prefixes.prototype;
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								  _proto.cleaner = function cleaner() {
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								    if (this.cleanerCache) {
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								      return this.cleanerCache;
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								    }
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								    if (this.browsers.selected.length) {
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								      var empty = new Browsers(this.browsers.data, []);
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								      this.cleanerCache = new Prefixes(this.data, empty, this.options);
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								    } else {
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								      return this;
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								    }
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								    return this.cleanerCache;
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								  }
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								  /**
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								     * Select prefixes from data, which is necessary for selected browsers
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								     */
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								  ;
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								  _proto.select = function select(list) {
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								    var _this = this;
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								    var selected = {
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								      add: {},
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								      remove: {}
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								    };
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								    var _loop = function _loop(name) {
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								      var data = list[name];
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								      var add = data.browsers.map(function (i) {
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								        var params = i.split(' ');
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								        return {
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								          browser: params[0] + " " + params[1],
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								          note: params[2]
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								        };
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								      });
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								      var notes = add.filter(function (i) {
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								        return i.note;
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								      }).map(function (i) {
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								        return _this.browsers.prefix(i.browser) + " " + i.note;
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								      });
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								      notes = utils.uniq(notes);
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								      add = add.filter(function (i) {
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								        return _this.browsers.isSelected(i.browser);
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								      }).map(function (i) {
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								        var prefix = _this.browsers.prefix(i.browser);
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								        if (i.note) {
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								          return prefix + " " + i.note;
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								        } else {
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								          return prefix;
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								        }
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								      });
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								      add = _this.sort(utils.uniq(add));
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								      if (_this.options.flexbox === 'no-2009') {
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								        add = add.filter(function (i) {
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								          return i.indexOf('2009') === -1;
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								        });
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								      }
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								      var all = data.browsers.map(function (i) {
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								        return _this.browsers.prefix(i);
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								      });
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								      if (data.mistakes) {
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								        all = all.concat(data.mistakes);
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								      }
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								      all = all.concat(notes);
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								      all = utils.uniq(all);
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								      if (add.length) {
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								        selected.add[name] = add;
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								        if (add.length < all.length) {
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								          selected.remove[name] = all.filter(function (i) {
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								            return add.indexOf(i) === -1;
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								          });
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								        }
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								      } else {
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								        selected.remove[name] = all;
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								      }
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								    };
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								    for (var name in list) {
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								      _loop(name);
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								    }
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								    return selected;
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								  }
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								  /**
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								     * Sort vendor prefixes
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								     */
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								  ;
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								  _proto.sort = function sort(prefixes) {
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								    return prefixes.sort(function (a, b) {
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								      var aLength = utils.removeNote(a).length;
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								      var bLength = utils.removeNote(b).length;
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								      if (aLength === bLength) {
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								        return b.length - a.length;
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								      } else {
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								        return bLength - aLength;
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								      }
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								    });
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								  }
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								  /**
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								     * Cache prefixes data to fast CSS processing
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								     */
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								  ;
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								  _proto.preprocess = function preprocess(selected) {
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								    var add = {
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								      'selectors': [],
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								      '@supports': new Supports(Prefixes, this)
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								    };
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								    for (var name in selected.add) {
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								      var prefixes = selected.add[name];
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								      if (name === '@keyframes' || name === '@viewport') {
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								        add[name] = new AtRule(name, prefixes, this);
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								      } else if (name === '@resolution') {
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								        add[name] = new Resolution(name, prefixes, this);
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								      } else if (this.data[name].selector) {
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								        add.selectors.push(Selector.load(name, prefixes, this));
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								      } else {
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								        var props = this.data[name].props;
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								        if (props) {
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								          var value = Value.load(name, prefixes, this);
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								          for (var _iterator = props, _isArray = Array.isArray(_iterator), _i = 0, _iterator = _isArray ? _iterator : _iterator[Symbol.iterator]();;) {
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								            var _ref;
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								            if (_isArray) {
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								              if (_i >= _iterator.length) break;
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								              _ref = _iterator[_i++];
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								            } else {
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								              _i = _iterator.next();
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								              if (_i.done) break;
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								              _ref = _i.value;
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								            }
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								            var prop = _ref;
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								            if (!add[prop]) {
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								              add[prop] = {
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								                values: []
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								              };
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								            }
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								            add[prop].values.push(value);
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								          }
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								        } else {
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								          var values = add[name] && add[name].values || [];
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								          add[name] = Declaration.load(name, prefixes, this);
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								          add[name].values = values;
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								        }
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								      }
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| 
								 | 
							
								    }
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								    var remove = {
							 | 
						||
| 
								 | 
							
								      selectors: []
							 | 
						||
| 
								 | 
							
								    };
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								    for (var _name in selected.remove) {
							 | 
						||
| 
								 | 
							
								      var _prefixes = selected.remove[_name];
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								      if (this.data[_name].selector) {
							 | 
						||
| 
								 | 
							
								        var selector = Selector.load(_name, _prefixes);
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								        for (var _iterator2 = _prefixes, _isArray2 = Array.isArray(_iterator2), _i2 = 0, _iterator2 = _isArray2 ? _iterator2 : _iterator2[Symbol.iterator]();;) {
							 | 
						||
| 
								 | 
							
								          var _ref2;
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								          if (_isArray2) {
							 | 
						||
| 
								 | 
							
								            if (_i2 >= _iterator2.length) break;
							 | 
						||
| 
								 | 
							
								            _ref2 = _iterator2[_i2++];
							 | 
						||
| 
								 | 
							
								          } else {
							 | 
						||
| 
								 | 
							
								            _i2 = _iterator2.next();
							 | 
						||
| 
								 | 
							
								            if (_i2.done) break;
							 | 
						||
| 
								 | 
							
								            _ref2 = _i2.value;
							 | 
						||
| 
								 | 
							
								          }
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								          var prefix = _ref2;
							 | 
						||
| 
								 | 
							
								          remove.selectors.push(selector.old(prefix));
							 | 
						||
| 
								 | 
							
								        }
							 | 
						||
| 
								 | 
							
								      } else if (_name === '@keyframes' || _name === '@viewport') {
							 | 
						||
| 
								 | 
							
								        for (var _iterator3 = _prefixes, _isArray3 = Array.isArray(_iterator3), _i3 = 0, _iterator3 = _isArray3 ? _iterator3 : _iterator3[Symbol.iterator]();;) {
							 | 
						||
| 
								 | 
							
								          var _ref3;
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								          if (_isArray3) {
							 | 
						||
| 
								 | 
							
								            if (_i3 >= _iterator3.length) break;
							 | 
						||
| 
								 | 
							
								            _ref3 = _iterator3[_i3++];
							 | 
						||
| 
								 | 
							
								          } else {
							 | 
						||
| 
								 | 
							
								            _i3 = _iterator3.next();
							 | 
						||
| 
								 | 
							
								            if (_i3.done) break;
							 | 
						||
| 
								 | 
							
								            _ref3 = _i3.value;
							 | 
						||
| 
								 | 
							
								          }
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								          var _prefix = _ref3;
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								          var prefixed = "@" + _prefix + _name.slice(1);
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								          remove[prefixed] = {
							 | 
						||
| 
								 | 
							
								            remove: true
							 | 
						||
| 
								 | 
							
								          };
							 | 
						||
| 
								 | 
							
								        }
							 | 
						||
| 
								 | 
							
								      } else if (_name === '@resolution') {
							 | 
						||
| 
								 | 
							
								        remove[_name] = new Resolution(_name, _prefixes, this);
							 | 
						||
| 
								 | 
							
								      } else {
							 | 
						||
| 
								 | 
							
								        var _props = this.data[_name].props;
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								        if (_props) {
							 | 
						||
| 
								 | 
							
								          var _value = Value.load(_name, [], this);
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								          for (var _iterator4 = _prefixes, _isArray4 = Array.isArray(_iterator4), _i4 = 0, _iterator4 = _isArray4 ? _iterator4 : _iterator4[Symbol.iterator]();;) {
							 | 
						||
| 
								 | 
							
								            var _ref4;
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								            if (_isArray4) {
							 | 
						||
| 
								 | 
							
								              if (_i4 >= _iterator4.length) break;
							 | 
						||
| 
								 | 
							
								              _ref4 = _iterator4[_i4++];
							 | 
						||
| 
								 | 
							
								            } else {
							 | 
						||
| 
								 | 
							
								              _i4 = _iterator4.next();
							 | 
						||
| 
								 | 
							
								              if (_i4.done) break;
							 | 
						||
| 
								 | 
							
								              _ref4 = _i4.value;
							 | 
						||
| 
								 | 
							
								            }
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								            var _prefix2 = _ref4;
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								            var old = _value.old(_prefix2);
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								            if (old) {
							 | 
						||
| 
								 | 
							
								              for (var _iterator5 = _props, _isArray5 = Array.isArray(_iterator5), _i5 = 0, _iterator5 = _isArray5 ? _iterator5 : _iterator5[Symbol.iterator]();;) {
							 | 
						||
| 
								 | 
							
								                var _ref5;
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								                if (_isArray5) {
							 | 
						||
| 
								 | 
							
								                  if (_i5 >= _iterator5.length) break;
							 | 
						||
| 
								 | 
							
								                  _ref5 = _iterator5[_i5++];
							 | 
						||
| 
								 | 
							
								                } else {
							 | 
						||
| 
								 | 
							
								                  _i5 = _iterator5.next();
							 | 
						||
| 
								 | 
							
								                  if (_i5.done) break;
							 | 
						||
| 
								 | 
							
								                  _ref5 = _i5.value;
							 | 
						||
| 
								 | 
							
								                }
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								                var _prop = _ref5;
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								                if (!remove[_prop]) {
							 | 
						||
| 
								 | 
							
								                  remove[_prop] = {};
							 | 
						||
| 
								 | 
							
								                }
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								                if (!remove[_prop].values) {
							 | 
						||
| 
								 | 
							
								                  remove[_prop].values = [];
							 | 
						||
| 
								 | 
							
								                }
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								                remove[_prop].values.push(old);
							 | 
						||
| 
								 | 
							
								              }
							 | 
						||
| 
								 | 
							
								            }
							 | 
						||
| 
								 | 
							
								          }
							 | 
						||
| 
								 | 
							
								        } else {
							 | 
						||
| 
								 | 
							
								          for (var _iterator6 = _prefixes, _isArray6 = Array.isArray(_iterator6), _i6 = 0, _iterator6 = _isArray6 ? _iterator6 : _iterator6[Symbol.iterator]();;) {
							 | 
						||
| 
								 | 
							
								            var _ref6;
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								            if (_isArray6) {
							 | 
						||
| 
								 | 
							
								              if (_i6 >= _iterator6.length) break;
							 | 
						||
| 
								 | 
							
								              _ref6 = _iterator6[_i6++];
							 | 
						||
| 
								 | 
							
								            } else {
							 | 
						||
| 
								 | 
							
								              _i6 = _iterator6.next();
							 | 
						||
| 
								 | 
							
								              if (_i6.done) break;
							 | 
						||
| 
								 | 
							
								              _ref6 = _i6.value;
							 | 
						||
| 
								 | 
							
								            }
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								            var _prefix3 = _ref6;
							 | 
						||
| 
								 | 
							
								            var olds = this.decl(_name).old(_name, _prefix3);
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								            if (_name === 'align-self') {
							 | 
						||
| 
								 | 
							
								              var a = add[_name] && add[_name].prefixes;
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								              if (a) {
							 | 
						||
| 
								 | 
							
								                if (_prefix3 === '-webkit- 2009' && a.indexOf('-webkit-') !== -1) {
							 | 
						||
| 
								 | 
							
								                  continue;
							 | 
						||
| 
								 | 
							
								                } else if (_prefix3 === '-webkit-' && a.indexOf('-webkit- 2009') !== -1) {
							 | 
						||
| 
								 | 
							
								                  continue;
							 | 
						||
| 
								 | 
							
								                }
							 | 
						||
| 
								 | 
							
								              }
							 | 
						||
| 
								 | 
							
								            }
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								            for (var _iterator7 = olds, _isArray7 = Array.isArray(_iterator7), _i7 = 0, _iterator7 = _isArray7 ? _iterator7 : _iterator7[Symbol.iterator]();;) {
							 | 
						||
| 
								 | 
							
								              var _ref7;
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								              if (_isArray7) {
							 | 
						||
| 
								 | 
							
								                if (_i7 >= _iterator7.length) break;
							 | 
						||
| 
								 | 
							
								                _ref7 = _iterator7[_i7++];
							 | 
						||
| 
								 | 
							
								              } else {
							 | 
						||
| 
								 | 
							
								                _i7 = _iterator7.next();
							 | 
						||
| 
								 | 
							
								                if (_i7.done) break;
							 | 
						||
| 
								 | 
							
								                _ref7 = _i7.value;
							 | 
						||
| 
								 | 
							
								              }
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								              var _prefixed = _ref7;
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								              if (!remove[_prefixed]) {
							 | 
						||
| 
								 | 
							
								                remove[_prefixed] = {};
							 | 
						||
| 
								 | 
							
								              }
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								              remove[_prefixed].remove = true;
							 | 
						||
| 
								 | 
							
								            }
							 | 
						||
| 
								 | 
							
								          }
							 | 
						||
| 
								 | 
							
								        }
							 | 
						||
| 
								 | 
							
								      }
							 | 
						||
| 
								 | 
							
								    }
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								    return [add, remove];
							 | 
						||
| 
								 | 
							
								  }
							 | 
						||
| 
								 | 
							
								  /**
							 | 
						||
| 
								 | 
							
								     * Declaration loader with caching
							 | 
						||
| 
								 | 
							
								     */
							 | 
						||
| 
								 | 
							
								  ;
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								  _proto.decl = function decl(prop) {
							 | 
						||
| 
								 | 
							
								    var decl = declsCache[prop];
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								    if (decl) {
							 | 
						||
| 
								 | 
							
								      return decl;
							 | 
						||
| 
								 | 
							
								    } else {
							 | 
						||
| 
								 | 
							
								      declsCache[prop] = Declaration.load(prop);
							 | 
						||
| 
								 | 
							
								      return declsCache[prop];
							 | 
						||
| 
								 | 
							
								    }
							 | 
						||
| 
								 | 
							
								  }
							 | 
						||
| 
								 | 
							
								  /**
							 | 
						||
| 
								 | 
							
								     * Return unprefixed version of property
							 | 
						||
| 
								 | 
							
								     */
							 | 
						||
| 
								 | 
							
								  ;
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								  _proto.unprefixed = function unprefixed(prop) {
							 | 
						||
| 
								 | 
							
								    var value = this.normalize(vendor.unprefixed(prop));
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								    if (value === 'flex-direction') {
							 | 
						||
| 
								 | 
							
								      value = 'flex-flow';
							 | 
						||
| 
								 | 
							
								    }
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								    return value;
							 | 
						||
| 
								 | 
							
								  }
							 | 
						||
| 
								 | 
							
								  /**
							 | 
						||
| 
								 | 
							
								     * Normalize prefix for remover
							 | 
						||
| 
								 | 
							
								     */
							 | 
						||
| 
								 | 
							
								  ;
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								  _proto.normalize = function normalize(prop) {
							 | 
						||
| 
								 | 
							
								    return this.decl(prop).normalize(prop);
							 | 
						||
| 
								 | 
							
								  }
							 | 
						||
| 
								 | 
							
								  /**
							 | 
						||
| 
								 | 
							
								     * Return prefixed version of property
							 | 
						||
| 
								 | 
							
								     */
							 | 
						||
| 
								 | 
							
								  ;
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								  _proto.prefixed = function prefixed(prop, prefix) {
							 | 
						||
| 
								 | 
							
								    prop = vendor.unprefixed(prop);
							 | 
						||
| 
								 | 
							
								    return this.decl(prop).prefixed(prop, prefix);
							 | 
						||
| 
								 | 
							
								  }
							 | 
						||
| 
								 | 
							
								  /**
							 | 
						||
| 
								 | 
							
								     * Return values, which must be prefixed in selected property
							 | 
						||
| 
								 | 
							
								     */
							 | 
						||
| 
								 | 
							
								  ;
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								  _proto.values = function values(type, prop) {
							 | 
						||
| 
								 | 
							
								    var data = this[type];
							 | 
						||
| 
								 | 
							
								    var global = data['*'] && data['*'].values;
							 | 
						||
| 
								 | 
							
								    var values = data[prop] && data[prop].values;
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								    if (global && values) {
							 | 
						||
| 
								 | 
							
								      return utils.uniq(global.concat(values));
							 | 
						||
| 
								 | 
							
								    } else {
							 | 
						||
| 
								 | 
							
								      return global || values || [];
							 | 
						||
| 
								 | 
							
								    }
							 | 
						||
| 
								 | 
							
								  }
							 | 
						||
| 
								 | 
							
								  /**
							 | 
						||
| 
								 | 
							
								     * Group declaration by unprefixed property to check them
							 | 
						||
| 
								 | 
							
								     */
							 | 
						||
| 
								 | 
							
								  ;
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								  _proto.group = function group(decl) {
							 | 
						||
| 
								 | 
							
								    var _this2 = this;
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								    var rule = decl.parent;
							 | 
						||
| 
								 | 
							
								    var index = rule.index(decl);
							 | 
						||
| 
								 | 
							
								    var length = rule.nodes.length;
							 | 
						||
| 
								 | 
							
								    var unprefixed = this.unprefixed(decl.prop);
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								    var checker = function checker(step, callback) {
							 | 
						||
| 
								 | 
							
								      index += step;
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								      while (index >= 0 && index < length) {
							 | 
						||
| 
								 | 
							
								        var other = rule.nodes[index];
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								        if (other.type === 'decl') {
							 | 
						||
| 
								 | 
							
								          if (step === -1 && other.prop === unprefixed) {
							 | 
						||
| 
								 | 
							
								            if (!Browsers.withPrefix(other.value)) {
							 | 
						||
| 
								 | 
							
								              break;
							 | 
						||
| 
								 | 
							
								            }
							 | 
						||
| 
								 | 
							
								          }
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								          if (_this2.unprefixed(other.prop) !== unprefixed) {
							 | 
						||
| 
								 | 
							
								            break;
							 | 
						||
| 
								 | 
							
								          } else if (callback(other) === true) {
							 | 
						||
| 
								 | 
							
								            return true;
							 | 
						||
| 
								 | 
							
								          }
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								          if (step === +1 && other.prop === unprefixed) {
							 | 
						||
| 
								 | 
							
								            if (!Browsers.withPrefix(other.value)) {
							 | 
						||
| 
								 | 
							
								              break;
							 | 
						||
| 
								 | 
							
								            }
							 | 
						||
| 
								 | 
							
								          }
							 | 
						||
| 
								 | 
							
								        }
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								        index += step;
							 | 
						||
| 
								 | 
							
								      }
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								      return false;
							 | 
						||
| 
								 | 
							
								    };
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								    return {
							 | 
						||
| 
								 | 
							
								      up: function up(callback) {
							 | 
						||
| 
								 | 
							
								        return checker(-1, callback);
							 | 
						||
| 
								 | 
							
								      },
							 | 
						||
| 
								 | 
							
								      down: function down(callback) {
							 | 
						||
| 
								 | 
							
								        return checker(+1, callback);
							 | 
						||
| 
								 | 
							
								      }
							 | 
						||
| 
								 | 
							
								    };
							 | 
						||
| 
								 | 
							
								  };
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								  return Prefixes;
							 | 
						||
| 
								 | 
							
								}();
							 | 
						||
| 
								 | 
							
								
							 | 
						||
| 
								 | 
							
								module.exports = Prefixes;
							 |