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node_modules
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util
File Content:
pseudoElements.js
/** @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__ }
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