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import selectorParser from 'postcss-selector-parser'
import unescape from 'postcss-selector-parser/dist/util/unesc'
import escapeClassName from '../util/escapeClassName'
import prefixSelector from '../util/prefixSelector'
import { movePseudos } from './pseudoElements'
import { splitAtTopLevelOnly } from './splitAtTopLevelOnly'
/** @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 */
/** @typedef {{format: string, respectPrefix: boolean}[]} RawFormats */
/** @typedef {import('postcss-selector-parser').Root} ParsedFormats */
/** @typedef {RawFormats | ParsedFormats} AcceptedFormats */
let MERGE = ':merge'
/**
* @param {RawFormats} formats
* @param {{context: any, candidate: string, base: string | null}} options
* @returns {ParsedFormats | null}
*/
export function formatVariantSelector(formats, { context, candidate }) {
let prefix = context?.tailwindConfig.prefix ?? ''
// Parse the format selector into an AST
let parsedFormats = formats.map((format) => {
let ast = selectorParser().astSync(format.format)
return {
...format,
ast: format.respectPrefix ? prefixSelector(prefix, ast) : ast,
}
})
// We start with the candidate selector
let formatAst = selectorParser.root({
nodes: [
selectorParser.selector({
nodes: [selectorParser.className({ value: escapeClassName(candidate) })],
}),
],
})
// And iteratively merge each format selector into the candidate selector
for (let { ast } of parsedFormats) {
// 1. Handle :merge() special pseudo-class
;[formatAst, ast] = handleMergePseudo(formatAst, ast)
// 2. Merge the format selector into the current selector AST
ast.walkNesting((nesting) => nesting.replaceWith(...formatAst.nodes[0].nodes))
// 3. Keep going!
formatAst = ast
}
return formatAst
}
/**
* Given any node in a selector this gets the "simple" selector it's a part of
* A simple selector is just a list of nodes without any combinators
* Technically :is(), :not(), :has(), etc… can have combinators but those are nested
* inside the relevant node and won't be picked up so they're fine to ignore
*
* @param {Node} node
* @returns {Node[]}
**/
function simpleSelectorForNode(node) {
/** @type {Node[]} */
let nodes = []
// Walk backwards until we hit a combinator node (or the start)
while (node.prev() && node.prev().type !== 'combinator') {
node = node.prev()
}
// Now record all non-combinator nodes until we hit one (or the end)
while (node && node.type !== 'combinator') {
nodes.push(node)
node = node.next()
}
return nodes
}
/**
* Resorts the nodes in a selector to ensure they're in the correct order
* Tags go before classes, and pseudo classes go after classes
*
* @param {Selector} sel
* @returns {Selector}
**/
function resortSelector(sel) {
sel.sort((a, b) => {
if (a.type === 'tag' && b.type === 'class') {
return -1
} else if (a.type === 'class' && b.type === 'tag') {
return 1
} else if (a.type === 'class' && b.type === 'pseudo' && b.value.startsWith('::')) {
return -1
} else if (a.type === 'pseudo' && a.value.startsWith('::') && b.type === 'class') {
return 1
}
return sel.index(a) - sel.index(b)
})
return sel
}
/**
* Remove extraneous selectors that do not include the base class/candidate
*
* Example:
* Given the utility `.a, .b { color: red}`
* Given the candidate `sm:b`
*
* The final selector should be `.sm\:b` and not `.a, .sm\:b`
*
* @param {Selector} ast
* @param {string} base
*/
export function eliminateIrrelevantSelectors(sel, base) {
let hasClassesMatchingCandidate = false
sel.walk((child) => {
if (child.type === 'class' && child.value === base) {
hasClassesMatchingCandidate = true
return false // Stop walking
}
})
if (!hasClassesMatchingCandidate) {
sel.remove()
}
// We do NOT recursively eliminate sub selectors that don't have the base class
// as this is NOT a safe operation. For example, if we have:
// `.space-x-2 > :not([hidden]) ~ :not([hidden])`
// We cannot remove the [hidden] from the :not() because it would change the
// meaning of the selector.
// TODO: Can we do this for :matches, :is, and :where?
}
/**
* @param {string} current
* @param {AcceptedFormats} formats
* @param {{context: any, candidate: string, base: string | null}} options
* @returns {string}
*/
export function finalizeSelector(current, formats, { context, candidate, base }) {
let separator = context?.tailwindConfig?.separator ?? ':'
// Split by the separator, but ignore the separator inside square brackets:
//
// E.g.: dark:lg:hover:[paint-order:markers]
// ┬ ┬ ┬ ┬
// │ │ │ ╰── We will not split here
// ╰──┴─────┴─────────────── We will split here
//
base = base ?? splitAtTopLevelOnly(candidate, separator).pop()
// Parse the selector into an AST
let selector = selectorParser().astSync(current)
// Normalize escaped classes, e.g.:
//
// The idea would be to replace the escaped `base` in the selector with the
// `format`. However, in css you can escape the same selector in a few
// different ways. This would result in different strings and therefore we
// can't replace it properly.
//
// base: bg-[rgb(255,0,0)]
// base in selector: bg-\\[rgb\\(255\\,0\\,0\\)\\]
// escaped base: bg-\\[rgb\\(255\\2c 0\\2c 0\\)\\]
//
selector.walkClasses((node) => {
if (node.raws && node.value.includes(base)) {
node.raws.value = escapeClassName(unescape(node.raws.value))
}
})
// Remove extraneous selectors that do not include the base candidate
selector.each((sel) => eliminateIrrelevantSelectors(sel, base))
// If ffter eliminating irrelevant selectors, we end up with nothing
// Then the whole "rule" this is associated with does not need to exist
// We use `null` as a marker value for that case
if (selector.length === 0) {
return null
}
// If there are no formats that means there were no variants added to the candidate
// so we can just return the selector as-is
let formatAst = Array.isArray(formats)
? formatVariantSelector(formats, { context, candidate })
: formats
if (formatAst === null) {
return selector.toString()
}
let simpleStart = selectorParser.comment({ value: '/*__simple__*/' })
let simpleEnd = selectorParser.comment({ value: '/*__simple__*/' })
// We can safely replace the escaped base now, since the `base` section is
// now in a normalized escaped value.
selector.walkClasses((node) => {
if (node.value !== base) {
return
}
let parent = node.parent
let formatNodes = formatAst.nodes[0].nodes
// Perf optimization: if the parent is a single class we can just replace it and be done
if (parent.nodes.length === 1) {
node.replaceWith(...formatNodes)
return
}
let simpleSelector = simpleSelectorForNode(node)
parent.insertBefore(simpleSelector[0], simpleStart)
parent.insertAfter(simpleSelector[simpleSelector.length - 1], simpleEnd)
for (let child of formatNodes) {
parent.insertBefore(simpleSelector[0], child.clone())
}
node.remove()
// Re-sort the simple selector to ensure it's in the correct order
simpleSelector = simpleSelectorForNode(simpleStart)
let firstNode = parent.index(simpleStart)
parent.nodes.splice(
firstNode,
simpleSelector.length,
...resortSelector(selectorParser.selector({ nodes: simpleSelector })).nodes
)
simpleStart.remove()
simpleEnd.remove()
})
// Remove unnecessary pseudo selectors that we used as placeholders
selector.walkPseudos((p) => {
if (p.value === MERGE) {
p.replaceWith(p.nodes)
}
})
// Move pseudo elements to the end of the selector (if necessary)
selector.each((sel) => movePseudos(sel))
return selector.toString()
}
/**
*
* @param {Selector} selector
* @param {Selector} format
*/
export function handleMergePseudo(selector, format) {
/** @type {{pseudo: Pseudo, value: string}[]} */
let merges = []
// Find all :merge() pseudo-classes in `selector`
selector.walkPseudos((pseudo) => {
if (pseudo.value === MERGE) {
merges.push({
pseudo,
value: pseudo.nodes[0].toString(),
})
}
})
// Find all :merge() "attachments" in `format` and attach them to the matching selector in `selector`
format.walkPseudos((pseudo) => {
if (pseudo.value !== MERGE) {
return
}
let value = pseudo.nodes[0].toString()
// Does `selector` contain a :merge() pseudo-class with the same value?
let existing = merges.find((merge) => merge.value === value)
// Nope so there's nothing to do
if (!existing) {
return
}
// Everything after `:merge()` up to the next combinator is what is attached to the merged selector
let attachments = []
let next = pseudo.next()
while (next && next.type !== 'combinator') {
attachments.push(next)
next = next.next()
}
let combinator = next
existing.pseudo.parent.insertAfter(
existing.pseudo,
selectorParser.selector({ nodes: attachments.map((node) => node.clone()) })
)
pseudo.remove()
attachments.forEach((node) => node.remove())
// What about this case:
// :merge(.group):focus > &
// :merge(.group):hover &
if (combinator && combinator.type === 'combinator') {
combinator.remove()
}
})
return [selector, format]
}