vue hello world项目
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import { Root } from 'postcss'
import * as postcss from 'postcss'
// postcss-selector-parser does have typings but it's problematic to work with.
const selectorParser = require('postcss-selector-parser')
export default postcss.plugin('add-id', (options: any) => (root: Root) => {
const id: string = options
const keyframes = Object.create(null)
root.each(function rewriteSelector(node: any) {
if (!node.selector) {
// handle media queries
if (node.type === 'atrule') {
if (node.name === 'media' || node.name === 'supports') {
node.each(rewriteSelector)
} else if (/-?keyframes$/.test(node.name)) {
// register keyframes
keyframes[node.params] = node.params = node.params + '-' + id
}
}
return
}
node.selector = selectorParser((selectors: any) => {
selectors.each((selector: any) => {
let node: any = null
// find the last child node to insert attribute selector
selector.each((n: any) => {
// ">>>" combinator
// and /deep/ alias for >>>, since >>> doesn't work in SASS
if (
n.type === 'combinator' &&
(n.value === '>>>' || n.value === '/deep/')
) {
n.value = ' '
n.spaces.before = n.spaces.after = ''
return false
}
// in newer versions of sass, /deep/ support is also dropped, so add a ::v-deep alias
if (n.type === 'pseudo' && n.value === '::v-deep') {
n.value = n.spaces.before = n.spaces.after = ''
return false
}
if (n.type !== 'pseudo' && n.type !== 'combinator') {
node = n
}
})
if (node) {
node.spaces.after = ''
} else {
// For deep selectors & standalone pseudo selectors,
// the attribute selectors are prepended rather than appended.
// So all leading spaces must be eliminated to avoid problems.
selector.first.spaces.before = ''
}
selector.insertAfter(
node,
selectorParser.attribute({
attribute: id
})
)
})
}).processSync(node.selector)
})
// If keyframes are found in this <style>, find and rewrite animation names
// in declarations.
// Caveat: this only works for keyframes and animation rules in the same
// <style> element.
if (Object.keys(keyframes).length) {
root.walkDecls(decl => {
// individual animation-name declaration
if (/^(-\w+-)?animation-name$/.test(decl.prop)) {
decl.value = decl.value
.split(',')
.map(v => keyframes[v.trim()] || v.trim())
.join(',')
}
// shorthand
if (/^(-\w+-)?animation$/.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(',')
}
})
}
})