selector.js
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'use strict';
function _defaults(obj, defaults) { var keys = Object.getOwnPropertyNames(defaults); for (var i = 0; i < keys.length; i++) { var key = keys[i]; var value = Object.getOwnPropertyDescriptor(defaults, key); if (value && value.configurable && obj[key] === undefined) { Object.defineProperty(obj, key, value); } } return obj; }
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
function _possibleConstructorReturn(self, call) { if (!self) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return call && (typeof call === "object" || typeof call === "function") ? call : self; }
function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function, not " + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : _defaults(subClass, superClass); }
var OldSelector = require('./old-selector');
var Prefixer = require('./prefixer');
var Browsers = require('./browsers');
var utils = require('./utils');
var Selector = function (_Prefixer) {
_inherits(Selector, _Prefixer);
function Selector(name, prefixes, all) {
_classCallCheck(this, Selector);
var _this = _possibleConstructorReturn(this, _Prefixer.call(this, name, prefixes, all));
_this.regexpCache = {};
return _this;
}
/**
* Is rule selectors need to be prefixed
*/
Selector.prototype.check = function check(rule) {
if (rule.selector.indexOf(this.name) !== -1) {
return !!rule.selector.match(this.regexp());
}
return false;
};
/**
* Return prefixed version of selector
*/
Selector.prototype.prefixed = function prefixed(prefix) {
return this.name.replace(/^([^\w]*)/, '$1' + prefix);
};
/**
* Lazy loadRegExp for name
*/
Selector.prototype.regexp = function regexp(prefix) {
if (this.regexpCache[prefix]) {
return this.regexpCache[prefix];
}
var name = prefix ? this.prefixed(prefix) : this.name;
this.regexpCache[prefix] = new RegExp('(^|[^:"\'=])' + utils.escapeRegexp(name), 'gi');
return this.regexpCache[prefix];
};
/**
* All possible prefixes
*/
Selector.prototype.possible = function possible() {
return Browsers.prefixes();
};
/**
* Return all possible selector prefixes
*/
Selector.prototype.prefixeds = function prefixeds(rule) {
if (rule._autoprefixerPrefixeds) {
return rule._autoprefixerPrefixeds;
}
var prefixeds = {};
for (var _iterator = this.possible(), _isArray = Array.isArray(_iterator), _i = 0, _iterator = _isArray ? _iterator : _iterator[Symbol.iterator]();;) {
var _ref;
if (_isArray) {
if (_i >= _iterator.length) break;
_ref = _iterator[_i++];
} else {
_i = _iterator.next();
if (_i.done) break;
_ref = _i.value;
}
var prefix = _ref;
prefixeds[prefix] = this.replace(rule.selector, prefix);
}
rule._autoprefixerPrefixeds = prefixeds;
return rule._autoprefixerPrefixeds;
};
/**
* Is rule already prefixed before
*/
Selector.prototype.already = function already(rule, prefixeds, prefix) {
var index = rule.parent.index(rule) - 1;
while (index >= 0) {
var before = rule.parent.nodes[index];
if (before.type !== 'rule') {
return false;
}
var some = false;
for (var key in prefixeds) {
var prefixed = prefixeds[key];
if (before.selector === prefixed) {
if (prefix === key) {
return true;
} else {
some = true;
break;
}
}
}
if (!some) {
return false;
}
index -= 1;
}
return false;
};
/**
* Replace selectors by prefixed one
*/
Selector.prototype.replace = function replace(selector, prefix) {
return selector.replace(this.regexp(), '$1' + this.prefixed(prefix));
};
/**
* Clone and add prefixes for at-rule
*/
Selector.prototype.add = function add(rule, prefix) {
var prefixeds = this.prefixeds(rule);
if (this.already(rule, prefixeds, prefix)) {
return;
}
var cloned = this.clone(rule, { selector: prefixeds[prefix] });
rule.parent.insertBefore(rule, cloned);
};
/**
* Return function to fast find prefixed selector
*/
Selector.prototype.old = function old(prefix) {
return new OldSelector(this, prefix);
};
return Selector;
}(Prefixer);
module.exports = Selector;