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type AtRule,
type Container,
type Document,
type PluginCreator,
Rule,
} from 'postcss'
import selectorParser from 'postcss-selector-parser'
import { warn } from '../warn'
const animationNameRE = /^(-\w+-)?animation-name$/
const animationRE = /^(-\w+-)?animation$/
const scopedPlugin: PluginCreator<string> = (id = '') => {
const keyframes = Object.create(null)
const shortId = id.replace(/^data-v-/, '')
return {
postcssPlugin: 'vue-sfc-scoped',
Rule(rule) {
processRule(id, rule)
},
AtRule(node) {
if (
/-?keyframes$/.test(node.name) &&
!node.params.endsWith(`-${shortId}`)
) {
// register keyframes
keyframes[node.params] = node.params = node.params + '-' + shortId
}
},
OnceExit(root) {
if (Object.keys(keyframes).length) {
// If keyframes are found in this <style>, find and rewrite animation names
// in declarations.
// Caveat: this only works for keyframes and animation rules in the same
// <style> element.
// individual animation-name declaration
root.walkDecls(decl => {
if (animationNameRE.test(decl.prop)) {
decl.value = decl.value
.split(',')
.map(v => keyframes[v.trim()] || v.trim())
.join(',')
}
// shorthand
if (animationRE.test(decl.prop)) {
decl.value = decl.value
.split(',')
.map(v => {
const vals = v.trim().split(/\s+/)
const i = vals.findIndex(val => keyframes[val])
if (i !== -1) {
vals.splice(i, 1, keyframes[vals[i]])
return vals.join(' ')
} else {
return v
}
})
.join(',')
}
})
}
},
}
}
const processedRules = new WeakSet<Rule>()
function processRule(id: string, rule: Rule) {
if (
processedRules.has(rule) ||
(rule.parent &&
rule.parent.type === 'atrule' &&
/-?keyframes$/.test((rule.parent as AtRule).name))
) {
return
}
processedRules.add(rule)
let deep = false
let parent: Document | Container | undefined = rule.parent
while (parent && parent.type !== 'root') {
if ((parent as any).__deep) {
deep = true
break
}
parent = parent.parent
}
rule.selector = selectorParser(selectorRoot => {
selectorRoot.each(selector => {
rewriteSelector(id, rule, selector, selectorRoot, deep)
})
}).processSync(rule.selector)
}
function rewriteSelector(
id: string,
rule: Rule,
selector: selectorParser.Selector,
selectorRoot: selectorParser.Root,
deep: boolean,
slotted = false,
) {
let node: selectorParser.Node | null = null
let shouldInject = !deep
// find the last child node to insert attribute selector
selector.each(n => {
// DEPRECATED ">>>" and "/deep/" combinator
if (
n.type === 'combinator' &&
(n.value === '>>>' || n.value === '/deep/')
) {
n.value = ' '
n.spaces.before = n.spaces.after = ''
warn(
`the >>> and /deep/ combinators have been deprecated. ` +
`Use :deep() instead.`,
)
return false
}
if (n.type === 'pseudo') {
const { value } = n
// deep: inject [id] attribute at the node before the ::v-deep
// combinator.
if (value === ':deep' || value === '::v-deep') {
;(rule as any).__deep = true
if (n.nodes.length) {
// .foo ::v-deep(.bar) -> .foo[xxxxxxx] .bar
// replace the current node with ::v-deep's inner selector
let last: selectorParser.Selector['nodes'][0] = n
n.nodes[0].each(ss => {
selector.insertAfter(last, ss)
last = ss
})
// insert a space combinator before if it doesn't already have one
const prev = selector.at(selector.index(n) - 1)
if (!prev || !isSpaceCombinator(prev)) {
selector.insertAfter(
n,
selectorParser.combinator({
value: ' ',
}),
)
}
selector.removeChild(n)
} else {
// DEPRECATED usage
// .foo ::v-deep .bar -> .foo[xxxxxxx] .bar
warn(
`${value} usage as a combinator has been deprecated. ` +
`Use :deep(<inner-selector>) instead of ${value} <inner-selector>.`,
)
const prev = selector.at(selector.index(n) - 1)
if (prev && isSpaceCombinator(prev)) {
selector.removeChild(prev)
}
selector.removeChild(n)
}
return false
}
// slot: use selector inside `::v-slotted` and inject [id + '-s']
// instead.
// ::v-slotted(.foo) -> .foo[xxxxxxx-s]
if (value === ':slotted' || value === '::v-slotted') {
rewriteSelector(
id,
rule,
n.nodes[0],
selectorRoot,
deep,
true /* slotted */,
)
let last: selectorParser.Selector['nodes'][0] = n
n.nodes[0].each(ss => {
selector.insertAfter(last, ss)
last = ss
})
// selector.insertAfter(n, n.nodes[0])
selector.removeChild(n)
// since slotted attribute already scopes the selector there's no
// need for the non-slot attribute.
shouldInject = false
return false
}
// global: replace with inner selector and do not inject [id].
// ::v-global(.foo) -> .foo
if (value === ':global' || value === '::v-global') {
selectorRoot.insertAfter(selector, n.nodes[0])
selectorRoot.removeChild(selector)
return false
}
}
if (n.type === 'universal') {
const prev = selector.at(selector.index(n) - 1)
const next = selector.at(selector.index(n) + 1)
// * ... {}
if (!prev) {
// * .foo {} -> .foo[xxxxxxx] {}
if (next) {
if (next.type === 'combinator' && next.value === ' ') {
selector.removeChild(next)
}
selector.removeChild(n)
return
} else {
// * {} -> [xxxxxxx] {}
node = selectorParser.combinator({
value: '',
})
selector.insertBefore(n, node)
selector.removeChild(n)
return false
}
}
// .foo * -> .foo[xxxxxxx] *
if (node) return
}
if (
(n.type !== 'pseudo' && n.type !== 'combinator') ||
(n.type === 'pseudo' &&
(n.value === ':is' || n.value === ':where') &&
!node)
) {
node = n
}
})
if (rule.nodes.some(node => node.type === 'rule')) {
const deep = (rule as any).__deep
if (!deep) {
extractAndWrapNodes(rule)
const atruleNodes = rule.nodes.filter(node => node.type === 'atrule')
for (const atnode of atruleNodes) {
extractAndWrapNodes(atnode)
}
}
shouldInject = deep
}
if (node) {
const { type, value } = node as selectorParser.Node
if (type === 'pseudo' && (value === ':is' || value === ':where')) {
;(node as selectorParser.Pseudo).nodes.forEach(value =>
rewriteSelector(id, rule, value, selectorRoot, deep, slotted),
)
shouldInject = false
}
}
if (node) {
;(node as selectorParser.Node).spaces.after = ''
} else {
// For deep selectors & standalone pseudo selectors,
// the attribute selectors are prepended rather than appended.
// So all leading spaces must be eliminated to avoid problems.
selector.first.spaces.before = ''
}
if (shouldInject) {
const idToAdd = slotted ? id + '-s' : id
selector.insertAfter(
// If node is null it means we need to inject [id] at the start
// insertAfter can handle `null` here
node as any,
selectorParser.attribute({
attribute: idToAdd,
value: idToAdd,
raws: {},
quoteMark: `"`,
}),
)
}
}
function isSpaceCombinator(node: selectorParser.Node) {
return node.type === 'combinator' && /^\s+$/.test(node.value)
}
function extractAndWrapNodes(parentNode: Rule | AtRule) {
if (!parentNode.nodes) return
const nodes = parentNode.nodes.filter(
node => node.type === 'decl' || node.type === 'comment',
)
if (nodes.length) {
for (const node of nodes) {
parentNode.removeChild(node)
}
const wrappedRule = new Rule({
nodes: nodes,
selector: '&',
})
parentNode.prepend(wrappedRule)
}
}
scopedPlugin.postcss = true
export default scopedPlugin
|