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/** @typedef {import('postcss-selector-parser').Root} Root */
/** @typedef {import('postcss-selector-parser').Selector} Selector */
/** @typedef {import('postcss-selector-parser').Pseudo} Pseudo */
/** @typedef {import('postcss-selector-parser').Node} Node */
// There are some pseudo-elements that may or may not be:
// **Actionable**
// Zero or more user-action pseudo-classes may be attached to the pseudo-element itself
// structural-pseudo-classes are NOT allowed but we don't make
// The spec is not clear on whether this is allowed or not — but in practice it is.
// **Terminal**
// It MUST be placed at the end of a selector
//
// This is the required in the spec. However, some pseudo elements are not "terminal" because
// they represent a "boundary piercing" that is compiled out by a build step.
// **Jumpable**
// Any terminal element may "jump" over combinators when moving to the end of the selector
//
// This is a backwards-compat quirk of pseudo element variants from earlier versions of Tailwind CSS.
/** @typedef {'terminal' | 'actionable' | 'jumpable'} PseudoProperty */
/** @type {Record<string, PseudoProperty[]>} */
let elementProperties = {
// Pseudo elements from the spec
'::after': ['terminal', 'jumpable'],
'::backdrop': ['terminal', 'jumpable'],
'::before': ['terminal', 'jumpable'],
'::cue': ['terminal'],
'::cue-region': ['terminal'],
'::first-letter': ['terminal', 'jumpable'],
'::first-line': ['terminal', 'jumpable'],
'::grammar-error': ['terminal'],
'::marker': ['terminal', 'jumpable'],
'::part': ['terminal', 'actionable'],
'::placeholder': ['terminal', 'jumpable'],
'::selection': ['terminal', 'jumpable'],
'::slotted': ['terminal'],
'::spelling-error': ['terminal'],
'::target-text': ['terminal'],
// Pseudo elements from the spec with special rules
'::file-selector-button': ['terminal', 'actionable'],
// Library-specific pseudo elements used by component libraries
// These are Shadow DOM-like
'::deep': ['actionable'],
'::v-deep': ['actionable'],
'::ng-deep': ['actionable'],
// Note: As a rule, double colons (::) should be used instead of a single colon
// (:). This distinguishes pseudo-classes from pseudo-elements. However, since
// this distinction was not present in older versions of the W3C spec, most
// browsers support both syntaxes for the original pseudo-elements.
':after': ['terminal', 'jumpable'],
':before': ['terminal', 'jumpable'],
':first-letter': ['terminal', 'jumpable'],
':first-line': ['terminal', 'jumpable'],
':where': [],
':is': [],
':has': [],
// The default value is used when the pseudo-element is not recognized
// Because it's not recognized, we don't know if it's terminal or not
// So we assume it can be moved AND can have user-action pseudo classes attached to it
__default__: ['terminal', 'actionable'],
}
/**
* @param {Selector} sel
* @returns {Selector}
*/
export function movePseudos(sel) {
let [pseudos] = movablePseudos(sel)
// Remove all pseudo elements from their respective selectors
pseudos.forEach(([sel, pseudo]) => sel.removeChild(pseudo))
// Re-add them to the end of the selector in the correct order.
// This moves terminal pseudo elements to the end of the
// selector otherwise the selector will not be valid.
//
// Examples:
// - `before:hover:text-center` would result in `.before\:hover\:text-center:hover::before`
// - `hover:before:text-center` would result in `.hover\:before\:text-center:hover::before`
//
// The selector `::before:hover` does not work but we
// can make it work for you by flipping the order.
sel.nodes.push(...pseudos.map(([, pseudo]) => pseudo))
return sel
}
/** @typedef {[sel: Selector, pseudo: Pseudo, attachedTo: Pseudo | null]} MovablePseudo */
/** @typedef {[pseudos: MovablePseudo[], lastSeenElement: Pseudo | null]} MovablePseudosResult */
/**
* @param {Selector} sel
* @returns {MovablePseudosResult}
*/
function movablePseudos(sel) {
/** @type {MovablePseudo[]} */
let buffer = []
/** @type {Pseudo | null} */
let lastSeenElement = null
for (let node of sel.nodes) {
if (node.type === 'combinator') {
buffer = buffer.filter(([, node]) => propertiesForPseudo(node).includes('jumpable'))
lastSeenElement = null
} else if (node.type === 'pseudo') {
if (isMovablePseudoElement(node)) {
lastSeenElement = node
buffer.push([sel, node, null])
} else if (lastSeenElement && isAttachablePseudoClass(node, lastSeenElement)) {
buffer.push([sel, node, lastSeenElement])
} else {
lastSeenElement = null
}
for (let sub of node.nodes ?? []) {
let [movable, lastSeenElementInSub] = movablePseudos(sub)
lastSeenElement = lastSeenElementInSub || lastSeenElement
buffer.push(...movable)
}
}
}
return [buffer, lastSeenElement]
}
/**
* @param {Node} node
* @returns {boolean}
*/
function isPseudoElement(node) {
return node.value.startsWith('::') || elementProperties[node.value] !== undefined
}
/**
* @param {Node} node
* @returns {boolean}
*/
function isMovablePseudoElement(node) {
return isPseudoElement(node) && propertiesForPseudo(node).includes('terminal')
}
/**
* @param {Node} node
* @param {Pseudo} pseudo
* @returns {boolean}
*/
function isAttachablePseudoClass(node, pseudo) {
if (node.type !== 'pseudo') return false
if (isPseudoElement(node)) return false
return propertiesForPseudo(pseudo).includes('actionable')
}
/**
* @param {Pseudo} pseudo
* @returns {PseudoProperty[]}
*/
function propertiesForPseudo(pseudo) {
return elementProperties[pseudo.value] ?? elementProperties.__default__
}