59 lines
1.5 KiB
Plaintext
59 lines
1.5 KiB
Plaintext
let comparisonMap = {
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atrule: ['name', 'params'],
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rule: ['selector'],
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}
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let types = new Set(Object.keys(comparisonMap))
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export default function collapseAdjacentRules() {
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function collapseRulesIn(root) {
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let currentRule = null
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root.each((node) => {
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if (!types.has(node.type)) {
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currentRule = null
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return
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}
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if (currentRule === null) {
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currentRule = node
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return
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}
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let properties = comparisonMap[node.type]
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if (node.type === 'atrule' && node.name === 'font-face') {
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currentRule = node
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} else if (
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properties.every(
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(property) =>
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(node[property] ?? '').replace(/\s+/g, ' ') ===
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(currentRule[property] ?? '').replace(/\s+/g, ' ')
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)
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) {
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// An AtRule may not have children (for example if we encounter duplicate @import url(…) rules)
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if (node.nodes) {
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currentRule.append(node.nodes)
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}
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node.remove()
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} else {
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currentRule = node
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}
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})
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// After we've collapsed adjacent rules & at-rules, we need to collapse
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// adjacent rules & at-rules that are children of at-rules.
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// We do not care about nesting rules because Tailwind CSS
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// explicitly does not handle rule nesting on its own as
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// the user is expected to use a nesting plugin
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root.each((node) => {
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if (node.type === 'atrule') {
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collapseRulesIn(node)
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}
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})
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}
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return (root) => {
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collapseRulesIn(root)
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}
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}
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