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| 1 | +import type { LightningVisitor } from './helpers.js' |
| 2 | +import { serializeSelector } from './helpers.js' |
| 3 | +import { stableClass } from './stableSelectors.js' |
| 4 | + |
| 5 | +export interface AutoStableConfig { |
| 6 | + namespace?: string |
| 7 | + include?: RegExp |
| 8 | + exclude?: RegExp |
| 9 | +} |
| 10 | + |
| 11 | +export type AutoStableOption = boolean | AutoStableConfig |
| 12 | +export type AutoStableVisitor = LightningVisitor |
| 13 | + |
| 14 | +type SelectorNode = { |
| 15 | + type: string |
| 16 | + value?: string |
| 17 | + name?: string |
| 18 | + kind?: string |
| 19 | + selectors?: Selector | Selector[] | null |
| 20 | + [key: string]: unknown |
| 21 | +} |
| 22 | + |
| 23 | +type Selector = SelectorNode[] |
| 24 | +type TransformResult = { selector: Selector; changed: boolean } |
| 25 | + |
| 26 | +type RuleWithSelectors = { |
| 27 | + selectors?: unknown |
| 28 | + value?: { |
| 29 | + selectors?: unknown |
| 30 | + } |
| 31 | +} |
| 32 | + |
| 33 | +function isSelectorList(value: unknown): value is Selector[] { |
| 34 | + return Array.isArray(value) |
| 35 | +} |
| 36 | + |
| 37 | +function isRuleWithSelectors(rule: unknown): rule is RuleWithSelectors { |
| 38 | + return typeof rule === 'object' && rule !== null |
| 39 | +} |
| 40 | + |
| 41 | +function hasSelectorList( |
| 42 | + rule: RuleWithSelectors, |
| 43 | +): rule is RuleWithSelectors & { selectors: Selector[] } { |
| 44 | + return isSelectorList(rule.selectors) |
| 45 | +} |
| 46 | + |
| 47 | +function hasValueSelectorList( |
| 48 | + rule: RuleWithSelectors, |
| 49 | +): rule is RuleWithSelectors & { value: { selectors: Selector[] } } { |
| 50 | + return isSelectorList(rule.value?.selectors) |
| 51 | +} |
| 52 | + |
| 53 | +function getSelectors(rule: RuleWithSelectors | undefined): Selector[] | undefined { |
| 54 | + if (rule && hasSelectorList(rule)) return rule.selectors |
| 55 | + if (rule && hasValueSelectorList(rule)) return rule.value.selectors |
| 56 | + return undefined |
| 57 | +} |
| 58 | + |
| 59 | +function setSelectors<T extends RuleWithSelectors>(rule: T, selectors: Selector[]): T { |
| 60 | + if (hasSelectorList(rule)) { |
| 61 | + rule.selectors = selectors |
| 62 | + return rule |
| 63 | + } |
| 64 | + if (hasValueSelectorList(rule)) { |
| 65 | + rule.value.selectors = selectors |
| 66 | + return rule |
| 67 | + } |
| 68 | + return rule |
| 69 | +} |
| 70 | + |
| 71 | +export function normalizeAutoStableOption(option?: AutoStableOption) { |
| 72 | + if (!option) return undefined |
| 73 | + if (option === true) return {} |
| 74 | + return option |
| 75 | +} |
| 76 | + |
| 77 | +export function buildAutoStableVisitor(option?: AutoStableOption) { |
| 78 | + const config = normalizeAutoStableOption(option) |
| 79 | + if (!config) return undefined |
| 80 | + |
| 81 | + const visitor: LightningVisitor = { |
| 82 | + Rule: { |
| 83 | + style(rule) { |
| 84 | + if (!isRuleWithSelectors(rule)) return rule |
| 85 | + const baseSelectors = getSelectors(rule) |
| 86 | + if (!baseSelectors) return rule |
| 87 | + const seen = new Set(baseSelectors.map(sel => serializeSelector(sel))) |
| 88 | + const augmented: typeof baseSelectors = [...baseSelectors] |
| 89 | + |
| 90 | + for (const selector of baseSelectors) { |
| 91 | + const { selector: stableSelector, changed } = transformSelector( |
| 92 | + selector, |
| 93 | + config, |
| 94 | + ) |
| 95 | + if (!changed) continue |
| 96 | + const key = serializeSelector(stableSelector) |
| 97 | + if (seen.has(key)) continue |
| 98 | + seen.add(key) |
| 99 | + augmented.push(stableSelector) |
| 100 | + } |
| 101 | + |
| 102 | + return setSelectors(rule, augmented) |
| 103 | + }, |
| 104 | + }, |
| 105 | + } |
| 106 | + |
| 107 | + return visitor |
| 108 | +} |
| 109 | + |
| 110 | +function transformSelector( |
| 111 | + selector: Selector, |
| 112 | + config: AutoStableConfig, |
| 113 | +): TransformResult { |
| 114 | + let changed = false |
| 115 | + const next = selector.map(node => transformNode(node, config, () => (changed = true))) |
| 116 | + return { selector: next, changed } |
| 117 | +} |
| 118 | + |
| 119 | +function transformNode( |
| 120 | + node: SelectorNode, |
| 121 | + config: AutoStableConfig, |
| 122 | + markChanged: () => void, |
| 123 | +) { |
| 124 | + if (!node || typeof node !== 'object') return node |
| 125 | + |
| 126 | + // Respect :global(...) scopes by leaving them untouched. |
| 127 | + if (node.type === 'pseudo-class' && node.kind === 'global') { |
| 128 | + return node |
| 129 | + } |
| 130 | + |
| 131 | + if (node.type === 'class') { |
| 132 | + const value = node.value ?? node.name ?? '' |
| 133 | + if (!shouldTransform(value, config)) { |
| 134 | + return node |
| 135 | + } |
| 136 | + const stable = stableClass(value, { namespace: config.namespace }) |
| 137 | + if (!stable || stable === value) { |
| 138 | + return node |
| 139 | + } |
| 140 | + markChanged() |
| 141 | + return { ...node, value: stable, name: stable } |
| 142 | + } |
| 143 | + |
| 144 | + if (hasSelectors(node)) { |
| 145 | + const nestedSelectors = node.selectors.map(sel => { |
| 146 | + const nested = transformSelector(sel, config) |
| 147 | + if (nested.changed) { |
| 148 | + markChanged() |
| 149 | + } |
| 150 | + return nested.selector |
| 151 | + }) |
| 152 | + return { ...node, selectors: nestedSelectors } |
| 153 | + } |
| 154 | + |
| 155 | + return node |
| 156 | +} |
| 157 | + |
| 158 | +function hasSelectors( |
| 159 | + node: SelectorNode, |
| 160 | +): node is SelectorNode & { selectors: Selector[] } { |
| 161 | + return Array.isArray(node.selectors) |
| 162 | +} |
| 163 | + |
| 164 | +function shouldTransform(token: string, config: AutoStableConfig) { |
| 165 | + if (config.exclude && config.exclude.test(token)) { |
| 166 | + return false |
| 167 | + } |
| 168 | + if (config.include && !config.include.test(token)) { |
| 169 | + return false |
| 170 | + } |
| 171 | + return true |
| 172 | +} |
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