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