import { Root } from 'postcss'
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import * as postcss from 'postcss'
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// postcss-selector-parser does have typings but it's problematic to work with.
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const selectorParser = require('postcss-selector-parser')
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export default postcss.plugin('add-id', (options: any) => (root: Root) => {
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const id: string = options
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const keyframes = Object.create(null)
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root.each(function rewriteSelector(node: any) {
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if (!node.selector) {
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// handle media queries
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if (node.type === 'atrule') {
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if (node.name === 'media' || node.name === 'supports') {
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node.each(rewriteSelector)
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} else if (/-?keyframes$/.test(node.name)) {
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// register keyframes
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keyframes[node.params] = node.params = node.params + '-' + id
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}
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}
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return
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}
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node.selector = selectorParser((selectors: any) => {
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selectors.each((selector: any) => {
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let node: any = null
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// find the last child node to insert attribute selector
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selector.each((n: any) => {
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// ">>>" combinator
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// and /deep/ alias for >>>, since >>> doesn't work in SASS
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if (
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n.type === 'combinator' &&
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(n.value === '>>>' || n.value === '/deep/')
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) {
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n.value = ' '
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n.spaces.before = n.spaces.after = ''
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return false
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}
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// in newer versions of sass, /deep/ support is also dropped, so add a ::v-deep alias
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if (n.type === 'pseudo' && n.value === '::v-deep') {
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n.value = n.spaces.before = n.spaces.after = ''
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return false
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}
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if (n.type !== 'pseudo' && n.type !== 'combinator') {
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node = n
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}
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})
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if (node) {
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node.spaces.after = ''
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} else {
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// For deep selectors & standalone pseudo selectors,
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// the attribute selectors are prepended rather than appended.
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// So all leading spaces must be eliminated to avoid problems.
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selector.first.spaces.before = ''
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}
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selector.insertAfter(
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node,
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selectorParser.attribute({
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attribute: id
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})
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)
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})
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}).processSync(node.selector)
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})
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// If keyframes are found in this <style>, find and rewrite animation names
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// in declarations.
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// Caveat: this only works for keyframes and animation rules in the same
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// <style> element.
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if (Object.keys(keyframes).length) {
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root.walkDecls(decl => {
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// individual animation-name declaration
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if (/^(-\w+-)?animation-name$/.test(decl.prop)) {
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decl.value = decl.value
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.split(',')
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.map(v => keyframes[v.trim()] || v.trim())
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.join(',')
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}
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// shorthand
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if (/^(-\w+-)?animation$/.test(decl.prop)) {
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decl.value = decl.value
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.split(',')
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.map(v => {
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const vals = v.trim().split(/\s+/)
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const i = vals.findIndex(val => keyframes[val])
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if (i !== -1) {
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vals.splice(i, 1, keyframes[vals[i]])
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return vals.join(' ')
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} else {
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return v
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}
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})
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.join(',')
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}
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})
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}
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})
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