1 | 'use strict';
|
2 |
|
3 | const isStandardSyntaxRule = require('../../utils/isStandardSyntaxRule');
|
4 | const parseSelector = require('../../utils/parseSelector');
|
5 | const report = require('../../utils/report');
|
6 | const resolvedNestedSelector = require('postcss-resolve-nested-selector');
|
7 | const ruleMessages = require('../../utils/ruleMessages');
|
8 | const validateOptions = require('../../utils/validateOptions');
|
9 |
|
10 | const ruleName = 'selector-max-combinators';
|
11 |
|
12 | const messages = ruleMessages(ruleName, {
|
13 | expected: (selector, max) =>
|
14 | `Expected "${selector}" to have no more than ${max} ${
|
15 | max === 1 ? 'combinator' : 'combinators'
|
16 | }`,
|
17 | });
|
18 |
|
19 | function rule(max) {
|
20 | return (root, result) => {
|
21 | const validOptions = validateOptions(result, ruleName, {
|
22 | actual: max,
|
23 | possible: [
|
24 | function (max) {
|
25 | return typeof max === 'number' && max >= 0;
|
26 | },
|
27 | ],
|
28 | });
|
29 |
|
30 | if (!validOptions) {
|
31 | return;
|
32 | }
|
33 |
|
34 | function checkSelector(selectorNode, ruleNode) {
|
35 | const count = selectorNode.reduce((total, childNode) => {
|
36 |
|
37 | if (childNode.type === 'selector') {
|
38 | checkSelector(childNode, ruleNode);
|
39 | }
|
40 |
|
41 | return (total += childNode.type === 'combinator' ? 1 : 0);
|
42 | }, 0);
|
43 |
|
44 | if (selectorNode.type !== 'root' && selectorNode.type !== 'pseudo' && count > max) {
|
45 | report({
|
46 | ruleName,
|
47 | result,
|
48 | node: ruleNode,
|
49 | message: messages.expected(selectorNode, max),
|
50 | word: selectorNode,
|
51 | });
|
52 | }
|
53 | }
|
54 |
|
55 | root.walkRules((ruleNode) => {
|
56 | if (!isStandardSyntaxRule(ruleNode)) {
|
57 | return;
|
58 | }
|
59 |
|
60 | ruleNode.selectors.forEach((selector) => {
|
61 | resolvedNestedSelector(selector, ruleNode).forEach((resolvedSelector) => {
|
62 | parseSelector(resolvedSelector, result, ruleNode, (container) =>
|
63 | checkSelector(container, ruleNode),
|
64 | );
|
65 | });
|
66 | });
|
67 | });
|
68 | };
|
69 | }
|
70 |
|
71 | rule.ruleName = ruleName;
|
72 | rule.messages = messages;
|
73 | module.exports = rule;
|