scope-id.js
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const postcss = require('postcss')
const selectorParser = require('postcss-selector-parser')
module.exports = postcss.plugin('add-id', ({ id }) => root => {
const keyframes = Object.create(null)
root.each(function rewriteSelector (node) {
if (!node.selector) {
// handle media queries
if (node.type === 'atrule') {
if (node.name === 'media' || node.name === 'supports') {
node.each(rewriteSelector)
} else if (/-?keyframes$/.test(node.name)) {
// register keyframes
keyframes[node.params] = node.params = node.params + '-' + id
}
}
return
}
node.selector = selectorParser(selectors => {
selectors.each(selector => {
let node = null
selector.each(n => {
// ">>>" combinator
if (n.type === 'combinator' && n.value === '>>>') {
n.value = ' '
n.spaces.before = n.spaces.after = ''
return false
}
// /deep/ alias for >>>, since >>> doesn't work in SASS
if (n.type === 'tag' && n.value === '/deep/') {
const prev = n.prev()
if (prev && prev.type === 'combinator' && prev.value === ' ') {
prev.remove()
}
n.remove()
return false
}
if (n.type !== 'pseudo' && n.type !== 'combinator') {
node = n
}
})
selector.insertAfter(node, selectorParser.attribute({
attribute: id
}))
})
}).process(node.selector).result
})
// If keyframes are found in this <style>, find and rewrite animation names
// in declarations.
// Caveat: this only works for keyframes and animation rules in the same
// <style> element.
if (Object.keys(keyframes).length) {
root.walkDecls(decl => {
// individual animation-name declaration
if (/-?animation-name$/.test(decl.prop)) {
decl.value = decl.value.split(',')
.map(v => keyframes[v.trim()] || v.trim())
.join(',')
}
// shorthand
if (/-?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(',')
}
})
}
})