541 lines
22 KiB
Plaintext
541 lines
22 KiB
Plaintext
"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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Object.defineProperty(exports, "default", {
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enumerable: true,
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get: function() {
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return expandApplyAtRules;
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}
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});
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const _postcss = /*#__PURE__*/ _interop_require_default(require("postcss"));
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const _postcssselectorparser = /*#__PURE__*/ _interop_require_default(require("postcss-selector-parser"));
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const _generateRules = require("./generateRules");
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const _escapeClassName = /*#__PURE__*/ _interop_require_default(require("../util/escapeClassName"));
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const _applyImportantSelector = require("../util/applyImportantSelector");
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const _pseudoElements = require("../util/pseudoElements");
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function _interop_require_default(obj) {
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return obj && obj.__esModule ? obj : {
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default: obj
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};
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}
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/** @typedef {Map<string, [any, import('postcss').Rule[]]>} ApplyCache */ function extractClasses(node) {
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/** @type {Map<string, Set<string>>} */ let groups = new Map();
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let container = _postcss.default.root({
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nodes: [
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node.clone()
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]
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});
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container.walkRules((rule)=>{
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(0, _postcssselectorparser.default)((selectors)=>{
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selectors.walkClasses((classSelector)=>{
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let parentSelector = classSelector.parent.toString();
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let classes = groups.get(parentSelector);
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if (!classes) {
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groups.set(parentSelector, classes = new Set());
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}
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classes.add(classSelector.value);
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});
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}).processSync(rule.selector);
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});
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let normalizedGroups = Array.from(groups.values(), (classes)=>Array.from(classes));
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let classes = normalizedGroups.flat();
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return Object.assign(classes, {
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groups: normalizedGroups
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});
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}
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let selectorExtractor = (0, _postcssselectorparser.default)();
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/**
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* @param {string} ruleSelectors
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*/ function extractSelectors(ruleSelectors) {
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return selectorExtractor.astSync(ruleSelectors);
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}
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function extractBaseCandidates(candidates, separator) {
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let baseClasses = new Set();
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for (let candidate of candidates){
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baseClasses.add(candidate.split(separator).pop());
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}
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return Array.from(baseClasses);
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}
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function prefix(context, selector) {
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let prefix = context.tailwindConfig.prefix;
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return typeof prefix === "function" ? prefix(selector) : prefix + selector;
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}
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function* pathToRoot(node) {
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yield node;
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while(node.parent){
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yield node.parent;
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node = node.parent;
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}
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}
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/**
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* Only clone the node itself and not its children
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*
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* @param {*} node
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* @param {*} overrides
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* @returns
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*/ function shallowClone(node, overrides = {}) {
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let children = node.nodes;
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node.nodes = [];
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let tmp = node.clone(overrides);
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node.nodes = children;
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return tmp;
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}
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/**
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* Clone just the nodes all the way to the top that are required to represent
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* this singular rule in the tree.
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*
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* For example, if we have CSS like this:
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* ```css
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* @media (min-width: 768px) {
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* @supports (display: grid) {
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* .foo {
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* display: grid;
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* grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
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* }
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* }
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*
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* @supports (backdrop-filter: blur(1px)) {
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* .bar {
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* backdrop-filter: blur(1px);
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* }
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* }
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*
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* .baz {
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* color: orange;
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* }
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* }
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* ```
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*
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* And we're cloning `.bar` it'll return a cloned version of what's required for just that single node:
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*
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* ```css
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* @media (min-width: 768px) {
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* @supports (backdrop-filter: blur(1px)) {
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* .bar {
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* backdrop-filter: blur(1px);
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* }
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* }
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* }
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* ```
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*
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* @param {import('postcss').Node} node
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*/ function nestedClone(node) {
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for (let parent of pathToRoot(node)){
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if (node === parent) {
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continue;
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}
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if (parent.type === "root") {
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break;
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}
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node = shallowClone(parent, {
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nodes: [
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node
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]
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});
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}
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return node;
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}
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/**
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* @param {import('postcss').Root} root
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*/ function buildLocalApplyCache(root, context) {
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/** @type {ApplyCache} */ let cache = new Map();
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root.walkRules((rule)=>{
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// Ignore rules generated by Tailwind
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for (let node of pathToRoot(rule)){
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var _node_raws_tailwind;
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if (((_node_raws_tailwind = node.raws.tailwind) === null || _node_raws_tailwind === void 0 ? void 0 : _node_raws_tailwind.layer) !== undefined) {
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return;
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}
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}
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// Clone what's required to represent this singular rule in the tree
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let container = nestedClone(rule);
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let sort = context.offsets.create("user");
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for (let className of extractClasses(rule)){
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let list = cache.get(className) || [];
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cache.set(className, list);
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list.push([
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{
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layer: "user",
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sort,
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important: false
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},
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container
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]);
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}
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});
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return cache;
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}
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/**
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* @returns {ApplyCache}
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*/ function buildApplyCache(applyCandidates, context) {
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for (let candidate of applyCandidates){
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if (context.notClassCache.has(candidate) || context.applyClassCache.has(candidate)) {
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continue;
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}
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if (context.classCache.has(candidate)) {
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context.applyClassCache.set(candidate, context.classCache.get(candidate).map(([meta, rule])=>[
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meta,
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rule.clone()
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]));
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continue;
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}
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let matches = Array.from((0, _generateRules.resolveMatches)(candidate, context));
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if (matches.length === 0) {
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context.notClassCache.add(candidate);
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continue;
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}
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context.applyClassCache.set(candidate, matches);
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}
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return context.applyClassCache;
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}
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/**
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* Build a cache only when it's first used
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*
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* @param {() => ApplyCache} buildCacheFn
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* @returns {ApplyCache}
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*/ function lazyCache(buildCacheFn) {
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let cache = null;
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return {
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get: (name)=>{
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cache = cache || buildCacheFn();
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return cache.get(name);
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},
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has: (name)=>{
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cache = cache || buildCacheFn();
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return cache.has(name);
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}
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};
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}
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/**
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* Take a series of multiple caches and merge
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* them so they act like one large cache
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*
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* @param {ApplyCache[]} caches
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* @returns {ApplyCache}
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*/ function combineCaches(caches) {
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return {
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get: (name)=>caches.flatMap((cache)=>cache.get(name) || []),
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has: (name)=>caches.some((cache)=>cache.has(name))
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};
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}
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function extractApplyCandidates(params) {
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let candidates = params.split(/[\s\t\n]+/g);
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if (candidates[candidates.length - 1] === "!important") {
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return [
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candidates.slice(0, -1),
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true
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];
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}
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return [
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candidates,
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false
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];
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}
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function processApply(root, context, localCache) {
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let applyCandidates = new Set();
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// Collect all @apply rules and candidates
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let applies = [];
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root.walkAtRules("apply", (rule)=>{
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let [candidates] = extractApplyCandidates(rule.params);
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for (let util of candidates){
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applyCandidates.add(util);
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}
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applies.push(rule);
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});
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// Start the @apply process if we have rules with @apply in them
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if (applies.length === 0) {
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return;
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}
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// Fill up some caches!
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let applyClassCache = combineCaches([
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localCache,
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buildApplyCache(applyCandidates, context)
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]);
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/**
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* When we have an apply like this:
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*
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* .abc {
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* @apply hover:font-bold;
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* }
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*
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* What we essentially will do is resolve to this:
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*
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* .abc {
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* @apply .hover\:font-bold:hover {
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* font-weight: 500;
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* }
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* }
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*
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* Notice that the to-be-applied class is `.hover\:font-bold:hover` and that the utility candidate was `hover:font-bold`.
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* What happens in this function is that we prepend a `.` and escape the candidate.
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* This will result in `.hover\:font-bold`
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* Which means that we can replace `.hover\:font-bold` with `.abc` in `.hover\:font-bold:hover` resulting in `.abc:hover`
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*
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* @param {string} selector
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* @param {string} utilitySelectors
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* @param {string} candidate
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*/ function replaceSelector(selector, utilitySelectors, candidate) {
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let selectorList = extractSelectors(selector);
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let utilitySelectorsList = extractSelectors(utilitySelectors);
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let candidateList = extractSelectors(`.${(0, _escapeClassName.default)(candidate)}`);
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let candidateClass = candidateList.nodes[0].nodes[0];
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selectorList.each((sel)=>{
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/** @type {Set<import('postcss-selector-parser').Selector>} */ let replaced = new Set();
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utilitySelectorsList.each((utilitySelector)=>{
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let hasReplaced = false;
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utilitySelector = utilitySelector.clone();
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utilitySelector.walkClasses((node)=>{
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if (node.value !== candidateClass.value) {
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return;
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}
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// Don't replace multiple instances of the same class
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// This is theoretically correct but only partially
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// We'd need to generate every possible permutation of the replacement
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// For example with `.foo + .foo { … }` and `section { @apply foo; }`
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// We'd need to generate all of these:
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// - `.foo + .foo`
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// - `.foo + section`
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// - `section + .foo`
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// - `section + section`
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if (hasReplaced) {
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return;
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}
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// Since you can only `@apply` class names this is sufficient
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// We want to replace the matched class name with the selector the user is using
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// Ex: Replace `.text-blue-500` with `.foo.bar:is(.something-cool)`
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node.replaceWith(...sel.nodes.map((node)=>node.clone()));
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// Record that we did something and we want to use this new selector
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replaced.add(utilitySelector);
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hasReplaced = true;
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});
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});
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// Sort tag names before class names (but only sort each group (separated by a combinator)
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// separately and not in total)
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// This happens when replacing `.bar` in `.foo.bar` with a tag like `section`
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for (let sel of replaced){
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let groups = [
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[]
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];
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for (let node of sel.nodes){
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if (node.type === "combinator") {
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groups.push(node);
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groups.push([]);
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} else {
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let last = groups[groups.length - 1];
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last.push(node);
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}
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}
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sel.nodes = [];
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for (let group of groups){
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if (Array.isArray(group)) {
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group.sort((a, b)=>{
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if (a.type === "tag" && b.type === "class") {
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return -1;
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} else if (a.type === "class" && b.type === "tag") {
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return 1;
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} else if (a.type === "class" && b.type === "pseudo" && b.value.startsWith("::")) {
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return -1;
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} else if (a.type === "pseudo" && a.value.startsWith("::") && b.type === "class") {
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return 1;
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}
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return 0;
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});
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}
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sel.nodes = sel.nodes.concat(group);
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}
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}
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sel.replaceWith(...replaced);
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});
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return selectorList.toString();
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}
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let perParentApplies = new Map();
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// Collect all apply candidates and their rules
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for (let apply of applies){
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let [candidates] = perParentApplies.get(apply.parent) || [
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[],
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apply.source
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];
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perParentApplies.set(apply.parent, [
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candidates,
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apply.source
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]);
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let [applyCandidates, important] = extractApplyCandidates(apply.params);
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if (apply.parent.type === "atrule") {
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if (apply.parent.name === "screen") {
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let screenType = apply.parent.params;
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throw apply.error(`@apply is not supported within nested at-rules like @screen. We suggest you write this as @apply ${applyCandidates.map((c)=>`${screenType}:${c}`).join(" ")} instead.`);
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}
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throw apply.error(`@apply is not supported within nested at-rules like @${apply.parent.name}. You can fix this by un-nesting @${apply.parent.name}.`);
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}
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for (let applyCandidate of applyCandidates){
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if ([
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prefix(context, "group"),
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prefix(context, "peer")
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].includes(applyCandidate)) {
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// TODO: Link to specific documentation page with error code.
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throw apply.error(`@apply should not be used with the '${applyCandidate}' utility`);
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}
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if (!applyClassCache.has(applyCandidate)) {
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throw apply.error(`The \`${applyCandidate}\` class does not exist. If \`${applyCandidate}\` is a custom class, make sure it is defined within a \`@layer\` directive.`);
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}
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let rules = applyClassCache.get(applyCandidate);
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candidates.push([
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applyCandidate,
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important,
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rules
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]);
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}
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}
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for (let [parent, [candidates, atApplySource]] of perParentApplies){
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let siblings = [];
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for (let [applyCandidate, important, rules] of candidates){
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let potentialApplyCandidates = [
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applyCandidate,
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...extractBaseCandidates([
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applyCandidate
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], context.tailwindConfig.separator)
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];
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for (let [meta, node] of rules){
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let parentClasses = extractClasses(parent);
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let nodeClasses = extractClasses(node);
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// When we encounter a rule like `.dark .a, .b { … }` we only want to be left with `[.dark, .a]` if the base applyCandidate is `.a` or with `[.b]` if the base applyCandidate is `.b`
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// So we've split them into groups
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nodeClasses = nodeClasses.groups.filter((classList)=>classList.some((className)=>potentialApplyCandidates.includes(className))).flat();
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// Add base utility classes from the @apply node to the list of
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// classes to check whether it intersects and therefore results in a
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// circular dependency or not.
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//
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// E.g.:
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// .foo {
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// @apply hover:a; // This applies "a" but with a modifier
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// }
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//
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// We only have to do that with base classes of the `node`, not of the `parent`
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// E.g.:
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// .hover\:foo {
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// @apply bar;
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// }
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// .bar {
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// @apply foo;
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// }
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//
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// This should not result in a circular dependency because we are
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// just applying `.foo` and the rule above is `.hover\:foo` which is
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// unrelated. However, if we were to apply `hover:foo` then we _did_
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// have to include this one.
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nodeClasses = nodeClasses.concat(extractBaseCandidates(nodeClasses, context.tailwindConfig.separator));
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let intersects = parentClasses.some((selector)=>nodeClasses.includes(selector));
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if (intersects) {
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throw node.error(`You cannot \`@apply\` the \`${applyCandidate}\` utility here because it creates a circular dependency.`);
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}
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let root = _postcss.default.root({
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nodes: [
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node.clone()
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]
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});
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// Make sure every node in the entire tree points back at the @apply rule that generated it
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root.walk((node)=>{
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node.source = atApplySource;
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});
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let canRewriteSelector = node.type !== "atrule" || node.type === "atrule" && node.name !== "keyframes";
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if (canRewriteSelector) {
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root.walkRules((rule)=>{
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// Let's imagine you have the following structure:
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//
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// .foo {
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// @apply bar;
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// }
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//
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// @supports (a: b) {
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// .bar {
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// color: blue
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// }
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//
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// .something-unrelated {}
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// }
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//
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// In this case we want to apply `.bar` but it happens to be in
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// an atrule node. We clone that node instead of the nested one
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// because we still want that @supports rule to be there once we
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// applied everything.
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//
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// However it happens to be that the `.something-unrelated` is
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// also in that same shared @supports atrule. This is not good,
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// and this should not be there. The good part is that this is
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// a clone already and it can be safely removed. The question is
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// how do we know we can remove it. Basically what we can do is
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// match it against the applyCandidate that you want to apply. If
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// it doesn't match the we can safely delete it.
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//
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// If we didn't do this, then the `replaceSelector` function
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// would have replaced this with something that didn't exist and
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// therefore it removed the selector altogether. In this specific
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// case it would result in `{}` instead of `.something-unrelated {}`
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if (!extractClasses(rule).some((candidate)=>candidate === applyCandidate)) {
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rule.remove();
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return;
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}
|
|
// Strip the important selector from the parent selector if at the beginning
|
|
let importantSelector = typeof context.tailwindConfig.important === "string" ? context.tailwindConfig.important : null;
|
|
// We only want to move the "important" selector if this is a Tailwind-generated utility
|
|
// We do *not* want to do this for user CSS that happens to be structured the same
|
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let isGenerated = parent.raws.tailwind !== undefined;
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let parentSelector = isGenerated && importantSelector && parent.selector.indexOf(importantSelector) === 0 ? parent.selector.slice(importantSelector.length) : parent.selector;
|
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// If the selector becomes empty after replacing the important selector
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// This means that it's the same as the parent selector and we don't want to replace it
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// Otherwise we'll crash
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|
if (parentSelector === "") {
|
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parentSelector = parent.selector;
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}
|
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rule.selector = replaceSelector(parentSelector, rule.selector, applyCandidate);
|
|
// And then re-add it if it was removed
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|
if (importantSelector && parentSelector !== parent.selector) {
|
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rule.selector = (0, _applyImportantSelector.applyImportantSelector)(rule.selector, importantSelector);
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}
|
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rule.walkDecls((d)=>{
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d.important = meta.important || important;
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});
|
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// Move pseudo elements to the end of the selector (if necessary)
|
|
let selector = (0, _postcssselectorparser.default)().astSync(rule.selector);
|
|
selector.each((sel)=>(0, _pseudoElements.movePseudos)(sel));
|
|
rule.selector = selector.toString();
|
|
});
|
|
}
|
|
// It could be that the node we were inserted was removed because the class didn't match
|
|
// If that was the *only* rule in the parent, then we have nothing add so we skip it
|
|
if (!root.nodes[0]) {
|
|
continue;
|
|
}
|
|
// Insert it
|
|
siblings.push([
|
|
meta.sort,
|
|
root.nodes[0]
|
|
]);
|
|
}
|
|
}
|
|
// Inject the rules, sorted, correctly
|
|
let nodes = context.offsets.sort(siblings).map((s)=>s[1]);
|
|
// `parent` refers to the node at `.abc` in: .abc { @apply mt-2 }
|
|
parent.after(nodes);
|
|
}
|
|
for (let apply of applies){
|
|
// If there are left-over declarations, just remove the @apply
|
|
if (apply.parent.nodes.length > 1) {
|
|
apply.remove();
|
|
} else {
|
|
// The node is empty, drop the full node
|
|
apply.parent.remove();
|
|
}
|
|
}
|
|
// Do it again, in case we have other `@apply` rules
|
|
processApply(root, context, localCache);
|
|
}
|
|
function expandApplyAtRules(context) {
|
|
return (root)=>{
|
|
// Build a cache of the user's CSS so we can use it to resolve classes used by @apply
|
|
let localCache = lazyCache(()=>buildLocalApplyCache(root, context));
|
|
processApply(root, context, localCache);
|
|
};
|
|
}
|