1 | 'use strict';
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2 |
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3 | const isStandardSyntaxRule = require('../../utils/isStandardSyntaxRule');
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4 | const parseSelector = require('../../utils/parseSelector');
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5 | const report = require('../../utils/report');
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6 | const resolvedNestedSelector = require('postcss-resolve-nested-selector');
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7 | const ruleMessages = require('../../utils/ruleMessages');
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8 | const selectorParser = require('postcss-selector-parser');
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9 | const validateOptions = require('../../utils/validateOptions');
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10 |
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11 | const ruleName = 'selector-max-universal';
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12 |
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13 | const messages = ruleMessages(ruleName, {
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14 | expected: (selector, max) =>
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15 | `Expected "${selector}" to have no more than ${max} universal ${
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16 | max === 1 ? 'selector' : 'selectors'
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17 | }`,
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18 | });
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19 |
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20 | function rule(max) {
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21 | return (root, result) => {
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22 | const validOptions = validateOptions(result, ruleName, {
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23 | actual: max,
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24 | possible: [
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25 | function (max) {
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26 | return typeof max === 'number' && max >= 0;
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27 | },
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28 | ],
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29 | });
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30 |
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31 | if (!validOptions) {
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32 | return;
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33 | }
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34 |
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35 | function checkSelector(selectorNode, ruleNode) {
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36 | const count = selectorNode.reduce((total, childNode) => {
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37 |
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38 |
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39 | if (childNode.type === 'selector') {
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40 | checkSelector(childNode, ruleNode);
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41 | }
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42 |
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43 | return (total += childNode.type === 'universal' ? 1 : 0);
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44 | }, 0);
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45 |
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46 | if (selectorNode.type !== 'root' && selectorNode.type !== 'pseudo' && count > max) {
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47 | report({
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48 | ruleName,
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49 | result,
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50 | node: ruleNode,
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51 | message: messages.expected(selectorNode, max),
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52 | word: selectorNode,
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53 | });
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54 | }
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55 | }
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56 |
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57 | root.walkRules((ruleNode) => {
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58 | if (!isStandardSyntaxRule(ruleNode)) {
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59 | return;
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60 | }
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61 |
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62 | const selectors = [];
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63 |
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64 | selectorParser()
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65 | .astSync(ruleNode.selector)
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66 | .walk((node) => {
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67 | if (node.type === 'selector') {
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68 | selectors.push(String(node).trim());
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69 | }
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70 | });
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71 |
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72 | selectors.forEach((selector) => {
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73 | resolvedNestedSelector(selector, ruleNode).forEach((resolvedSelector) => {
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74 | parseSelector(resolvedSelector, result, ruleNode, (container) =>
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75 | checkSelector(container, ruleNode),
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76 | );
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77 | });
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78 | });
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79 | });
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80 | };
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81 | }
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82 |
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83 | rule.ruleName = ruleName;
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84 | rule.messages = messages;
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85 | module.exports = rule;
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