/
substituteVariantsAtRules.js
158 lines (141 loc) · 5.53 KB
/
substituteVariantsAtRules.js
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
import _ from 'lodash'
import postcss from 'postcss'
import selectorParser from 'postcss-selector-parser'
import generateVariantFunction from '../util/generateVariantFunction'
import prefixSelector from '../util/prefixSelector'
import buildSelectorVariant from '../util/buildSelectorVariant'
function generatePseudoClassVariant(pseudoClass, selectorPrefix = pseudoClass) {
return generateVariantFunction(({ modifySelectors, separator }) => {
const parser = selectorParser(selectors => {
selectors.walkClasses(sel => {
sel.value = `${selectorPrefix}${separator}${sel.value}`
sel.parent.insertAfter(sel, selectorParser.pseudo({ value: `:${pseudoClass}` }))
})
})
return modifySelectors(({ selector }) => parser.processSync(selector))
})
}
function ensureIncludesDefault(variants) {
return variants.includes('DEFAULT') ? variants : ['DEFAULT', ...variants]
}
const defaultVariantGenerators = config => ({
DEFAULT: generateVariantFunction(() => {}),
'motion-safe': generateVariantFunction(
({ container, separator, modifySelectors }) => {
const modified = modifySelectors(({ selector }) => {
return buildSelectorVariant(selector, 'motion-safe', separator, message => {
throw container.error(message)
})
})
const mediaQuery = postcss.atRule({
name: 'media',
params: '(prefers-reduced-motion: no-preference)',
})
mediaQuery.append(modified)
container.append(mediaQuery)
},
{ unstable_stack: true }
),
'motion-reduce': generateVariantFunction(
({ container, separator, modifySelectors }) => {
const modified = modifySelectors(({ selector }) => {
return buildSelectorVariant(selector, 'motion-reduce', separator, message => {
throw container.error(message)
})
})
const mediaQuery = postcss.atRule({
name: 'media',
params: '(prefers-reduced-motion: reduce)',
})
mediaQuery.append(modified)
container.append(mediaQuery)
},
{ unstable_stack: true }
),
'group-hover': generateVariantFunction(({ modifySelectors, separator }) => {
const parser = selectorParser(selectors => {
selectors.walkClasses(sel => {
sel.value = `group-hover${separator}${sel.value}`
sel.parent.insertBefore(
sel,
selectorParser().astSync(prefixSelector(config.prefix, '.group:hover '))
)
})
})
return modifySelectors(({ selector }) => parser.processSync(selector))
}),
'group-focus': generateVariantFunction(({ modifySelectors, separator }) => {
const parser = selectorParser(selectors => {
selectors.walkClasses(sel => {
sel.value = `group-focus${separator}${sel.value}`
sel.parent.insertBefore(
sel,
selectorParser().astSync(prefixSelector(config.prefix, '.group:focus '))
)
})
})
return modifySelectors(({ selector }) => parser.processSync(selector))
}),
hover: generatePseudoClassVariant('hover'),
'focus-within': generatePseudoClassVariant('focus-within'),
'focus-visible': generatePseudoClassVariant('focus-visible'),
focus: generatePseudoClassVariant('focus'),
active: generatePseudoClassVariant('active'),
visited: generatePseudoClassVariant('visited'),
disabled: generatePseudoClassVariant('disabled'),
checked: generatePseudoClassVariant('checked'),
first: generatePseudoClassVariant('first-child', 'first'),
last: generatePseudoClassVariant('last-child', 'last'),
odd: generatePseudoClassVariant('nth-child(odd)', 'odd'),
even: generatePseudoClassVariant('nth-child(even)', 'even'),
})
function prependStackableVariants(atRule, variants, stackableVariants) {
if (!_.some(variants, v => stackableVariants.includes(v))) {
return variants
}
if (_.every(variants, v => stackableVariants.includes(v))) {
return variants
}
const variantsParent = postcss.atRule({
name: 'variants',
params: variants.filter(v => stackableVariants.includes(v)).join(', '),
})
atRule.before(variantsParent)
variantsParent.append(atRule)
variants = _.without(variants, ...stackableVariants)
return variants
}
export default function(config, { variantGenerators: pluginVariantGenerators }) {
return function(css) {
const variantGenerators = {
...defaultVariantGenerators(config),
...pluginVariantGenerators,
}
const stackableVariants = Object.entries(variantGenerators)
.filter(([_variant, { options }]) => options.unstable_stack)
.map(([variant]) => variant)
let variantsFound = false
do {
variantsFound = false
css.walkAtRules('variants', atRule => {
variantsFound = true
let variants = postcss.list.comma(atRule.params).filter(variant => variant !== '')
if (variants.includes('responsive')) {
const responsiveParent = postcss.atRule({ name: 'responsive' })
atRule.before(responsiveParent)
responsiveParent.append(atRule)
}
const remainingVariants = prependStackableVariants(atRule, variants, stackableVariants)
_.forEach(_.without(ensureIncludesDefault(remainingVariants), 'responsive'), variant => {
if (!variantGenerators[variant]) {
throw new Error(
`Your config mentions the "${variant}" variant, but "${variant}" doesn't appear to be a variant. Did you forget or misconfigure a plugin that supplies that variant?`
)
}
variantGenerators[variant].handler(atRule, config)
})
atRule.remove()
})
} while (variantsFound)
}
}