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| 1 | +import postcss from 'postcss' |
| 2 | +import selectorParser from 'postcss-selector-parser' |
| 3 | + |
| 4 | +let elementSelectorParser = selectorParser((selectors) => { |
| 5 | + return selectors.map((s) => { |
| 6 | + return s |
| 7 | + .split((n) => n.type === 'combinator') |
| 8 | + .pop() |
| 9 | + .filter((n) => n.type !== 'pseudo' || n.value.startsWith('::')) |
| 10 | + .join('') |
| 11 | + .trim() |
| 12 | + }) |
| 13 | +}) |
| 14 | + |
| 15 | +let cache = new Map() |
| 16 | + |
| 17 | +function extractElementSelector(selector) { |
| 18 | + if (!cache.has(selector)) { |
| 19 | + cache.set(selector, elementSelectorParser.transformSync(selector)) |
| 20 | + } |
| 21 | + |
| 22 | + return cache.get(selector) |
| 23 | +} |
| 24 | + |
| 25 | +export default function resolveDefaultsAtRules() { |
| 26 | + return (root) => { |
| 27 | + let variableNodeMap = new Map() |
| 28 | + let universals = new Set() |
| 29 | + |
| 30 | + root.walkAtRules('defaults', (rule) => { |
| 31 | + if (rule.nodes.length > 0) { |
| 32 | + universals.add(rule) |
| 33 | + return |
| 34 | + } |
| 35 | + |
| 36 | + let variable = rule.params |
| 37 | + if (!variableNodeMap.has(variable)) { |
| 38 | + variableNodeMap.set(variable, new Set()) |
| 39 | + } |
| 40 | + |
| 41 | + variableNodeMap.get(variable).add(rule.parent) |
| 42 | + |
| 43 | + rule.remove() |
| 44 | + }) |
| 45 | + |
| 46 | + for (let universal of universals) { |
| 47 | + let selectors = new Set() |
| 48 | + |
| 49 | + let rules = variableNodeMap.get(universal.params) ?? [] |
| 50 | + |
| 51 | + for (let rule of rules) { |
| 52 | + for (let selector of extractElementSelector(rule.selector)) { |
| 53 | + selectors.add(selector) |
| 54 | + } |
| 55 | + } |
| 56 | + |
| 57 | + if (selectors.size === 0) { |
| 58 | + universal.remove() |
| 59 | + continue |
| 60 | + } |
| 61 | + |
| 62 | + let universalRule = postcss.rule() |
| 63 | + universalRule.selectors = [...selectors] |
| 64 | + universalRule.append(universal.nodes) |
| 65 | + universal.before(universalRule) |
| 66 | + universal.remove() |
| 67 | + } |
| 68 | + } |
| 69 | +} |
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