| 'use strict'; |
| |
| Object.defineProperty(exports, "__esModule", { |
| value: true |
| }); |
| |
| var _postcss = require('postcss'); |
| |
| function noop() {} |
| |
| function trimValue(value) { |
| return value ? value.trim() : value; |
| } |
| |
| function empty(node) { |
| return !node.nodes.filter(child => child.type !== 'comment').length; |
| } |
| |
| function equals(a, b) { |
| if (a.type !== b.type) { |
| return false; |
| } |
| |
| if (a.important !== b.important) { |
| return false; |
| } |
| |
| if (a.raws && !b.raws || !a.raws && b.raws) { |
| return false; |
| } |
| |
| switch (a.type) { |
| case 'rule': |
| if (a.selector !== b.selector) { |
| return false; |
| } |
| break; |
| case 'atrule': |
| if (a.name !== b.name || a.params !== b.params) { |
| return false; |
| } |
| |
| if (a.raws && trimValue(a.raws.before) !== trimValue(b.raws.before)) { |
| return false; |
| } |
| |
| if (a.raws && trimValue(a.raws.afterName) !== trimValue(b.raws.afterName)) { |
| return false; |
| } |
| break; |
| case 'decl': |
| if (a.prop !== b.prop || a.value !== b.value) { |
| return false; |
| } |
| |
| if (a.raws && trimValue(a.raws.before) !== trimValue(b.raws.before)) { |
| return false; |
| } |
| break; |
| } |
| |
| if (a.nodes) { |
| if (a.nodes.length !== b.nodes.length) { |
| return false; |
| } |
| |
| for (let i = 0; i < a.nodes.length; i++) { |
| if (!equals(a.nodes[i], b.nodes[i])) { |
| return false; |
| } |
| } |
| } |
| return true; |
| } |
| |
| function dedupeRule(last, nodes) { |
| let index = nodes.indexOf(last) - 1; |
| while (index >= 0) { |
| const node = nodes[index--]; |
| if (node && node.type === 'rule' && node.selector === last.selector) { |
| last.each(child => { |
| if (child.type === 'decl') { |
| dedupeNode(child, node.nodes); |
| } |
| }); |
| |
| if (empty(node)) { |
| node.remove(); |
| } |
| } |
| } |
| } |
| |
| function dedupeNode(last, nodes) { |
| let index = !!~nodes.indexOf(last) ? nodes.indexOf(last) - 1 : nodes.length - 1; |
| |
| while (index >= 0) { |
| const node = nodes[index--]; |
| if (node && equals(node, last)) { |
| node.remove(); |
| } |
| } |
| } |
| |
| const handlers = { |
| rule: dedupeRule, |
| atrule: dedupeNode, |
| decl: dedupeNode, |
| comment: noop |
| }; |
| |
| function dedupe(root) { |
| const { nodes } = root; |
| |
| if (!nodes) { |
| return; |
| } |
| |
| let index = nodes.length - 1; |
| while (index >= 0) { |
| let last = nodes[index--]; |
| if (!last || !last.parent) { |
| continue; |
| } |
| dedupe(last); |
| handlers[last.type](last, nodes); |
| } |
| } |
| |
| exports.default = (0, _postcss.plugin)('postcss-discard-duplicates', () => dedupe); |
| module.exports = exports['default']; |