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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)
rule.selector = selectorParser(selectorRoot => {
selectorRoot.each(selector => {
rewriteSelector(id, selector, selectorRoot)
})
}).processSync(rule.selector)
}
function rewriteSelector(
id: string,
selector: selectorParser.Selector,
selectorRoot: selectorParser.Root,
slotted = false
) {
let node: selectorParser.Node | null = null
let shouldInject = true
// 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') {
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(
`::v-deep usage as a combinator has ` +
`been deprecated. Use :deep(<inner-selector>) instead.`
)
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, n.nodes[0], selectorRoot, 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 !== 'pseudo' && n.type !== 'combinator') {
node = n
}
})
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)
}
scopedPlugin.postcss = true
export default scopedPlugin
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