| 'use strict'; |
| |
| Object.defineProperty(exports, "__esModule", { |
| value: true |
| }); |
| |
| var _postcss = require('postcss'); |
| |
| var _postcss2 = _interopRequireDefault(_postcss); |
| |
| function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; } |
| |
| const OVERRIDABLE_RULES = ['keyframes', 'counter-style']; |
| const SCOPE_RULES = ['media', 'supports']; |
| |
| function isOverridable(name) { |
| return ~OVERRIDABLE_RULES.indexOf(_postcss2.default.vendor.unprefixed(name.toLowerCase())); |
| } |
| |
| function isScope(name) { |
| return ~SCOPE_RULES.indexOf(_postcss2.default.vendor.unprefixed(name.toLowerCase())); |
| } |
| |
| function getScope(node) { |
| let current = node.parent; |
| const chain = [node.name.toLowerCase(), node.params]; |
| do { |
| if (current.type === 'atrule' && isScope(current.name)) { |
| chain.unshift(current.name + ' ' + current.params); |
| } |
| current = current.parent; |
| } while (current); |
| return chain.join('|'); |
| } |
| |
| exports.default = _postcss2.default.plugin('postcss-discard-overridden', () => { |
| return css => { |
| const cache = {}; |
| const rules = []; |
| css.walkAtRules(node => { |
| if (isOverridable(node.name)) { |
| const scope = getScope(node); |
| cache[scope] = node; |
| rules.push({ |
| node, |
| scope |
| }); |
| } |
| }); |
| rules.forEach(rule => { |
| if (cache[rule.scope] !== rule.node) { |
| rule.node.remove(); |
| } |
| }); |
| }; |
| }); |
| module.exports = exports['default']; |