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rOACCT/node_modules/@emotion/cache/src/stylis-plugins.js
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stylis-plugins.js
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			import {
			compile,
			alloc,
			dealloc,
			next,
			delimit,
			token,
			char,
			from,
			peek,
			position,
			slice
			} from 'stylis'

			const last = arr => (arr.length ? arr[arr.length - 1] : null)

			// based on https://github.com/thysultan/stylis.js/blob/e6843c373ebcbbfade25ebcc23f540ed8508da0a/src/Tokenizer.js#L239-L244
			const identifierWithPointTracking = (begin, points, index) => {
			let previous = 0
			let character = 0

			while (true) {
			previous = character
			character = peek()

			// &\f
			if (previous === 38 && character === 12) {
			points[index] = 1
			}

			if (token(character)) {
			break
			}

			next()
			}

			return slice(begin, position)
			}

			const toRules = (parsed, points) => {
			// pretend we've started with a comma
			let index = -1
			let character = 44

			do {
			switch (token(character)) {
			case 0:
			// &\f
			if (character === 38 && peek() === 12) {
			// this is not 100% correct, we don't account for literal sequences here - like for example quoted strings
			// stylis inserts \f after & to know when & where it should replace this sequence with the context selector
			// and when it should just concatenate the outer and inner selectors
			// it's very unlikely for this sequence to actually appear in a different context, so we just leverage this fact here
			points[index] = 1
			}
			parsed[index] += identifierWithPointTracking(
			position - 1,
			points,
			index
			)
			break
			case 2:
			parsed[index] += delimit(character)
			break
			case 4:
			// comma
			if (character === 44) {
			// colon
			parsed[++index] = peek() === 58 ? '&\f' : ''
			points[index] = parsed[index].length
			break
			}
			// fallthrough
			default:
			parsed[index] += from(character)
			}
			} while ((character = next()))

			return parsed
			}

			const getRules = (value, points) => dealloc(toRules(alloc(value), points))

			// WeakSet would be more appropriate, but only WeakMap is supported in IE11
			const fixedElements = /* #__PURE__ */ new WeakMap()

			export let compat = element => {
			if (
			element.type !== 'rule' \|\|
			!element.parent \|\|
			// positive .length indicates that this rule contains pseudo
			// negative .length indicates that this rule has been already prefixed
			element.length < 1
			) {
			return
			}

			let { value, parent } = element
			let isImplicitRule =
			element.column === parent.column && element.line === parent.line

			while (parent.type !== 'rule') {
			parent = parent.parent
			if (!parent) return
			}

			// short-circuit for the simplest case
			if (
			element.props.length === 1 &&
			value.charCodeAt(0) !== 58 /* colon */ &&
			!fixedElements.get(parent)
			) {
			return
			}

			// if this is an implicitly inserted rule (the one eagerly inserted at the each new nested level)
			// then the props has already been manipulated beforehand as they that array is shared between it and its "rule parent"
			if (isImplicitRule) {
			return
			}

			fixedElements.set(element, true)

			const points = []
			const rules = getRules(value, points)
			const parentRules = parent.props

			for (let i = 0, k = 0; i < rules.length; i++) {
			for (let j = 0; j < parentRules.length; j++, k++) {
			element.props[k] = points[i]
			? rules[i].replace(/&\f/g, parentRules[j])
			: `${parentRules[j]} ${rules[i]}`
			}
			}
			}

			export let removeLabel = element => {
			if (element.type === 'decl') {
			var value = element.value
			if (
			// charcode for l
			value.charCodeAt(0) === 108 &&
			// charcode for b
			value.charCodeAt(2) === 98
			) {
			// this ignores label
			element.return = ''
			element.value = ''
			}
			}
			}

			const ignoreFlag =
			'emotion-disable-server-rendering-unsafe-selector-warning-please-do-not-use-this-the-warning-exists-for-a-reason'

			const isIgnoringComment = element =>
			element.type === 'comm' && element.children.indexOf(ignoreFlag) > -1

			export let createUnsafeSelectorsAlarm = cache => (element, index, children) => {
			if (element.type !== 'rule' \|\| cache.compat) return

			const unsafePseudoClasses = element.value.match(
			/(:first\|:nth\|:nth-last)-child/g
			)

			if (unsafePseudoClasses) {
			const isNested = element.parent === children[0]
			// in nested rules comments become children of the "auto-inserted" rule
			//
			// considering this input:
			// .a {
			// .b /* comm */ {}
			// color: hotpink;
			// }
			// we get output corresponding to this:
			// .a {
			// & {
			// /* comm */
			// color: hotpink;
			// }
			// .b {}
			// }
			const commentContainer = isNested
			? children[0].children
			: // global rule at the root level
			children

			for (let i = commentContainer.length - 1; i >= 0; i--) {
			const node = commentContainer[i]

			if (node.line < element.line) {
			break
			}

			// it is quite weird but comments are usually put at `column: element.column - 1`
			// so we seek from the end for the node that is earlier than the rule's `element` and check that
			// this will also match inputs like this:
			// .a {
			// /* comm */
			// .b {}
			// }
			//
			// but that is fine
			//
			// it would be the easiest to change the placement of the comment to be the first child of the rule:
			// .a {
			// .b { /* comm */ }
			// }
			// with such inputs we wouldn't have to search for the comment at all
			// TODO: consider changing this comment placement in the next major version
			if (node.column < element.column) {
			if (isIgnoringComment(node)) {
			return
			}
			break
			}
			}

			unsafePseudoClasses.forEach(unsafePseudoClass => {
			console.error(
			`The pseudo class "${unsafePseudoClass}" is potentially unsafe when doing server-side rendering. Try changing it to "${
			unsafePseudoClass.split('-child')[0]
			}-of-type".`
			)
			})
			}
			}

			let isImportRule = element =>
			element.type.charCodeAt(1) === 105 && element.type.charCodeAt(0) === 64

			const isPrependedWithRegularRules = (index, children) => {
			for (let i = index - 1; i >= 0; i--) {
			if (!isImportRule(children[i])) {
			return true
			}
			}
			return false
			}

			// use this to remove incorrect elements from further processing
			// so they don't get handed to the `sheet` (or anything else)
			// as that could potentially lead to additional logs which in turn could be overhelming to the user
			const nullifyElement = element => {
			element.type = ''
			element.value = ''
			element.return = ''
			element.children = ''
			element.props = ''
			}

			export let incorrectImportAlarm = (element, index, children) => {
			if (!isImportRule(element)) {
			return
			}

			if (element.parent) {
			console.error(
			"`@import` rules can't be nested inside other rules. Please move it to the top level and put it before regular rules. Keep in mind that they can only be used within global styles."
			)
			nullifyElement(element)
			} else if (isPrependedWithRegularRules(index, children)) {
			console.error(
			"`@import` rules can't be after other rules. Please put your `@import` rules before your other rules."
			)
			nullifyElement(element)
			}
			}