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import fs from 'fs'
import LRU from '@alloc/quick-lru'
import * as sharedState from './sharedState'
import { generateRules } from './generateRules'
import log from '../util/log'
import cloneNodes from '../util/cloneNodes'
import { defaultExtractor } from './defaultExtractor'
let env = sharedState.env
const builtInExtractors = {
DEFAULT: defaultExtractor,
}
const builtInTransformers = {
DEFAULT: (content) => content,
svelte: (content) => content.replace(/(?:^|\s)class:/g, ' '),
}
function getExtractor(context, fileExtension) {
let extractors = context.tailwindConfig.content.extract
return (
extractors[fileExtension] ||
extractors.DEFAULT ||
builtInExtractors[fileExtension] ||
builtInExtractors.DEFAULT(context)
)
}
function getTransformer(tailwindConfig, fileExtension) {
let transformers = tailwindConfig.content.transform
return (
transformers[fileExtension] ||
transformers.DEFAULT ||
builtInTransformers[fileExtension] ||
builtInTransformers.DEFAULT
)
}
let extractorCache = new WeakMap()
// Scans template contents for possible classes. This is a hot path on initial build but
// not too important for subsequent builds. The faster the better though — if we can speed
// up these regexes by 50% that could cut initial build time by like 20%.
function getClassCandidates(content, extractor, candidates, seen) {
if (!extractorCache.has(extractor)) {
extractorCache.set(extractor, new LRU({ maxSize: 25000 }))
}
for (let line of content.split('\n')) {
line = line.trim()
if (seen.has(line)) {
continue
}
seen.add(line)
if (extractorCache.get(extractor).has(line)) {
for (let match of extractorCache.get(extractor).get(line)) {
candidates.add(match)
}
} else {
let extractorMatches = extractor(line).filter((s) => s !== '!*')
let lineMatchesSet = new Set(extractorMatches)
for (let match of lineMatchesSet) {
candidates.add(match)
}
extractorCache.get(extractor).set(line, lineMatchesSet)
}
}
}
/**
*
* @param {[import('./offsets.js').RuleOffset, import('postcss').Node][]} rules
* @param {*} context
*/
function buildStylesheet(rules, context) {
let sortedRules = context.offsets.sort(rules)
let returnValue = {
base: new Set(),
defaults: new Set(),
components: new Set(),
utilities: new Set(),
variants: new Set(),
}
for (let [sort, rule] of sortedRules) {
returnValue[sort.layer].add(rule)
}
return returnValue
}
export default function expandTailwindAtRules(context) {
return async (root) => {
let layerNodes = {
base: null,
components: null,
utilities: null,
variants: null,
}
root.walkAtRules((rule) => {
// Make sure this file contains Tailwind directives. If not, we can save
// a lot of work and bail early. Also we don't have to register our touch
// file as a dependency since the output of this CSS does not depend on
// the source of any templates. Think Vue <style> blocks for example.
if (rule.name === 'tailwind') {
if (Object.keys(layerNodes).includes(rule.params)) {
layerNodes[rule.params] = rule
}
}
})
if (Object.values(layerNodes).every((n) => n === null)) {
return root
}
// ---
// Find potential rules in changed files
let candidates = new Set([...(context.candidates ?? []), sharedState.NOT_ON_DEMAND])
let seen = new Set()
env.DEBUG && console.time('Reading changed files')
/** @type {[item: {file?: string, content?: string}, meta: {transformer: any, extractor: any}][]} */
let regexParserContent = []
for (let item of context.changedContent) {
let transformer = getTransformer(context.tailwindConfig, item.extension)
let extractor = getExtractor(context, item.extension)
regexParserContent.push([item, { transformer, extractor }])
}
const BATCH_SIZE = 500
for (let i = 0; i < regexParserContent.length; i += BATCH_SIZE) {
let batch = regexParserContent.slice(i, i + BATCH_SIZE)
await Promise.all(
batch.map(async ([{ file, content }, { transformer, extractor }]) => {
content = file ? await fs.promises.readFile(file, 'utf8') : content
getClassCandidates(transformer(content), extractor, candidates, seen)
})
)
}
env.DEBUG && console.timeEnd('Reading changed files')
// ---
// Generate the actual CSS
let classCacheCount = context.classCache.size
env.DEBUG && console.time('Generate rules')
env.DEBUG && console.time('Sorting candidates')
let sortedCandidates = new Set(
[...candidates].sort((a, z) => {
if (a === z) return 0
if (a < z) return -1
return 1
})
)
env.DEBUG && console.timeEnd('Sorting candidates')
generateRules(sortedCandidates, context)
env.DEBUG && console.timeEnd('Generate rules')
// We only ever add to the classCache, so if it didn't grow, there is nothing new.
env.DEBUG && console.time('Build stylesheet')
if (context.stylesheetCache === null || context.classCache.size !== classCacheCount) {
context.stylesheetCache = buildStylesheet([...context.ruleCache], context)
}
env.DEBUG && console.timeEnd('Build stylesheet')
let {
defaults: defaultNodes,
base: baseNodes,
components: componentNodes,
utilities: utilityNodes,
variants: screenNodes,
} = context.stylesheetCache
// ---
// Replace any Tailwind directives with generated CSS
if (layerNodes.base) {
layerNodes.base.before(
cloneNodes([...defaultNodes, ...baseNodes], layerNodes.base.source, {
layer: 'base',
})
)
layerNodes.base.remove()
}
if (layerNodes.components) {
layerNodes.components.before(
cloneNodes([...componentNodes], layerNodes.components.source, {
layer: 'components',
})
)
layerNodes.components.remove()
}
if (layerNodes.utilities) {
layerNodes.utilities.before(
cloneNodes([...utilityNodes], layerNodes.utilities.source, {
layer: 'utilities',
})
)
layerNodes.utilities.remove()
}
// We do post-filtering to not alter the emitted order of the variants
const variantNodes = Array.from(screenNodes).filter((node) => {
const parentLayer = node.raws.tailwind?.parentLayer
if (parentLayer === 'components') {
return layerNodes.components !== null
}
if (parentLayer === 'utilities') {
return layerNodes.utilities !== null
}
return true
})
if (layerNodes.variants) {
layerNodes.variants.before(
cloneNodes(variantNodes, layerNodes.variants.source, {
layer: 'variants',
})
)
layerNodes.variants.remove()
} else if (variantNodes.length > 0) {
root.append(
cloneNodes(variantNodes, root.source, {
layer: 'variants',
})
)
}
// TODO: Why is the root node having no source location for `end` possible?
root.source.end = root.source.end ?? root.source.start
// If we've got a utility layer and no utilities are generated there's likely something wrong
const hasUtilityVariants = variantNodes.some(
(node) => node.raws.tailwind?.parentLayer === 'utilities'
)
if (layerNodes.utilities && utilityNodes.size === 0 && !hasUtilityVariants) {
log.warn('content-problems', [
'No utility classes were detected in your source files. If this is unexpected, double-check the `content` option in your Tailwind CSS configuration.',
'https://tailwindcss.com/docs/content-configuration',
])
}
// ---
if (env.DEBUG) {
console.log('Potential classes: ', candidates.size)
console.log('Active contexts: ', sharedState.contextSourcesMap.size)
}
// Clear the cache for the changed files
context.changedContent = []
// Cleanup any leftover @layer atrules
root.walkAtRules('layer', (rule) => {
if (Object.keys(layerNodes).includes(rule.params)) {
rule.remove()
}
})
}
}