1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
|
'use strict';
const _ = require('lodash');
const isKeyframeSelector = require('../../utils/isKeyframeSelector');
const isLogicalCombination = require('../../utils/isLogicalCombination');
const isOnlyWhitespace = require('../../utils/isOnlyWhitespace');
const isStandardSyntaxRule = require('../../utils/isStandardSyntaxRule');
const isStandardSyntaxSelector = require('../../utils/isStandardSyntaxSelector');
const optionsMatches = require('../../utils/optionsMatches');
const parseSelector = require('../../utils/parseSelector');
const report = require('../../utils/report');
const resolvedNestedSelector = require('postcss-resolve-nested-selector');
const ruleMessages = require('../../utils/ruleMessages');
const validateOptions = require('../../utils/validateOptions');
const ruleName = 'selector-max-type';
const messages = ruleMessages(ruleName, {
expected: (selector, max) =>
`Expected "${selector}" to have no more than ${max} type ${
max === 1 ? 'selector' : 'selectors'
}`,
});
function rule(max, options) {
return (root, result) => {
const validOptions = validateOptions(
result,
ruleName,
{
actual: max,
possible(max) {
return typeof max === 'number' && max >= 0;
},
},
{
actual: options,
possible: {
ignore: ['descendant', 'child', 'compounded', 'next-sibling'],
ignoreTypes: [_.isString, _.isRegExp],
},
optional: true,
},
);
if (!validOptions) {
return;
}
const ignoreDescendant = optionsMatches(options, 'ignore', 'descendant');
const ignoreChild = optionsMatches(options, 'ignore', 'child');
const ignoreCompounded = optionsMatches(options, 'ignore', 'compounded');
const ignoreNextSibling = optionsMatches(options, 'ignore', 'next-sibling');
function checkSelector(selectorNode, ruleNode) {
const count = selectorNode.reduce((total, childNode) => {
// Only traverse inside actual selectors and logical combinations
if (childNode.type === 'selector' || isLogicalCombination(childNode)) {
checkSelector(childNode, ruleNode);
}
if (optionsMatches(options, 'ignoreTypes', childNode.value)) {
return total;
}
if (ignoreDescendant && hasDescendantCombinatorBefore(childNode)) {
return total;
}
if (ignoreChild && hasChildCombinatorBefore(childNode)) {
return total;
}
if (ignoreCompounded && hasCompoundSelector(childNode)) {
return total;
}
if (ignoreNextSibling && hasNextSiblingCombinator(childNode)) {
return total;
}
return total + (childNode.type === 'tag');
}, 0);
if (selectorNode.type !== 'root' && selectorNode.type !== 'pseudo' && count > max) {
report({
ruleName,
result,
node: ruleNode,
message: messages.expected(selectorNode, max),
word: selectorNode,
});
}
}
root.walkRules((ruleNode) => {
const selectors = ruleNode.selectors;
if (!isStandardSyntaxRule(ruleNode)) {
return;
}
if (selectors.some((s) => isKeyframeSelector(s))) {
return;
}
ruleNode.selectors.forEach((selector) => {
resolvedNestedSelector(selector, ruleNode).forEach((resolvedSelector) => {
if (!isStandardSyntaxSelector(resolvedSelector)) {
return;
}
parseSelector(resolvedSelector, result, ruleNode, (container) =>
checkSelector(container, ruleNode),
);
});
});
});
};
}
function hasDescendantCombinatorBefore(node) {
const nodeIndex = node.parent.nodes.indexOf(node);
return node.parent.nodes.slice(0, nodeIndex).some(isDescendantCombinator);
}
function hasChildCombinatorBefore(node) {
const nodeIndex = node.parent.nodes.indexOf(node);
return node.parent.nodes.slice(0, nodeIndex).some(isChildCombinator);
}
function hasCompoundSelector(node) {
if (node.prev() && !isCombinator(node.prev())) {
return true;
}
return node.next() && !isCombinator(node.next());
}
function hasNextSiblingCombinator(node) {
return node.prev() && isNextSiblingCombinator(node.prev());
}
function isCombinator(node) {
if (!node) return false;
return _.get(node, 'type') === 'combinator';
}
function isDescendantCombinator(node) {
if (!node) return false;
return isCombinator(node) && isOnlyWhitespace(node.value);
}
function isChildCombinator(node) {
if (!node) return false;
return isCombinator(node) && node.value === '>';
}
function isNextSiblingCombinator(node) {
return isCombinator(node) && node.value === '+';
}
rule.ruleName = ruleName;
rule.messages = messages;
module.exports = rule;
|
