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import { EvalActions, evalExpr } from './eval'
import {
extractDeclaration,
DeclarationEval,
Declaration,
expressionsToDeclrs,
} from './declarations'
import { parse } from './parser'
import { match } from './utils/adt'
const UNSET_PROPERTY_VALUE = '<unset>'
const EVENT_HANDLERS = {
click: '--cssx-on-click',
load: '--cssx-on-load',
mount: '--cssx-on-mount',
submit: '--cssx-on-submit',
}
const PROPERTIES = [
'--cssx-children',
'--cssx-text',
'--cssx-disgustingly-set-innerhtml',
]
export const injectStyles = () => {
const STYLE_TAG_CLASS = 'cssx-style-root'
if (document.querySelector(`.${STYLE_TAG_CLASS}`)) return
const $style = document.createElement('style')
$style.className = STYLE_TAG_CLASS
const properties = [...PROPERTIES, ...Object.values(EVENT_HANDLERS)]
$style.textContent = `.cssx-layer {
${properties.map(p => `${p}: ${UNSET_PROPERTY_VALUE};`).join(' ')}
}`
document.body.appendChild($style)
}
export const getPropertyValue = ($element: Element, prop: string) => {
const value = `${getComputedStyle($element).getPropertyValue(prop)}`.trim()
return !value || value === UNSET_PROPERTY_VALUE ? '' : value
}
export const getDeclarations = (
$element: Element,
actions: EvalActions,
): Promise<Array<DeclarationEval>> => {
const value = getPropertyValue($element, '--cssx-children')
return extractDeclaration(value, actions)
}
const getEvalActions = ($element: Element, event: any): EvalActions => ({
addClass: async (id, cls) => document.getElementById(id)?.classList.add(cls),
removeClass: async (id, cls) =>
document.getElementById(id)?.classList.remove(cls),
delay: delay => new Promise(res => setTimeout(res, delay)),
jsEval: async js => (0, eval)(js),
loadCssx: async (id, url) =>
new Promise((resolve, reject) => {
const $link = Object.assign(document.createElement('link'), {
href: url,
rel: 'stylesheet',
})
$link.onload = () => {
const $el = document.getElementById(id)
// NOTE: Maybe create and append to body if no root?
if ($el) {
manageElement($el)
resolve(id)
} else {
console.error(`[CSSX] Unable to find root for ${id}`)
reject(`[CSSX] Unable to find root for ${id}`)
}
}
document.body.appendChild($link)
}),
getVariable: async varName => getPropertyValue($element, varName),
updateVariable: async (targetId, varName, value) => {
const $el = document.getElementById(targetId)
if ($el) {
$el.style.setProperty(varName, JSON.stringify(value))
}
},
setAttribute: async (id, name, value) => {
const $el = id ? document.getElementById(id) : $element
if (value) {
$el?.setAttribute(name, value)
} else {
$el?.removeAttribute(name)
}
},
getAttribute: async (id, name) => {
const $el = id ? document.getElementById(id) : $element
return $el?.getAttribute(name) ?? undefined
},
withEvent: async fn => fn(event),
getFormData: async () =>
$element.nodeName === 'FORM'
? new FormData($element as HTMLFormElement)
: undefined,
sendRequest: async ({ url, method, data }) => {
await fetch(url, { method, body: data })
// TODO: Handle response?
},
addChildren: async (id, children) => {
const $el = document.getElementById(id)
const declarations = await expressionsToDeclrs(
children,
getEvalActions($element, event),
)
$el && createLayer(declarations, $el)
},
removeElement: async id => {
const $el = id ? document.getElementById(id) : $element
$el?.parentNode?.removeChild($el)
},
})
export const handleEvents = async (
$element: Element,
isNewElement: boolean = false,
) => {
for (const [eventType, property] of Object.entries(EVENT_HANDLERS)) {
const handlerExpr = getPropertyValue($element, property)
if (handlerExpr) {
const eventHandler = async (event: any) => {
const exprs = parse(handlerExpr)
for (const expr of exprs) {
await evalExpr(expr, getEvalActions($element, event))
}
}
if (eventType === 'mount') {
if (isNewElement) setTimeout(eventHandler)
} else {
;($element as any)[`on${eventType}`] = eventHandler
}
}
}
}
const declarationToElement = (
declaration: DeclarationEval,
$parent?: Element,
) => {
const { tag, id, selectors } = declaration.selector
const tagName = tag || 'div'
let $child = $parent?.querySelector(`:scope > #${id}`)
if (!$child) {
$child = Object.assign(document.createElement(tagName), { id })
}
// Add selectors
for (const selector of selectors) {
match(selector, {
ClassName: cls =>
!$child?.classList.contains(cls) && $child?.classList.add(cls),
Attr: ([key, val]) => $child?.setAttribute(key, val),
})
}
return { node: $child, isNewElement: !$child }
}
const createLayer = async (
declarations: Array<DeclarationEval>,
$parent: Element,
) => {
const LAYER_CLASS = 'cssx-layer'
const $childrenRoot =
$parent?.querySelector(`:scope > .${LAYER_CLASS}`) ??
Object.assign(document.createElement('div'), { className: LAYER_CLASS })
for (const declaration of declarations) {
const { node: $child, isNewElement } = declarationToElement(
declaration,
$childrenRoot,
)
$childrenRoot.appendChild($child)
await manageElement($child, isNewElement)
}
if (!$childrenRoot.parentNode) $parent.appendChild($childrenRoot)
}
export const manageElement = async (
$element: Element,
isNewElement: boolean = false,
) => {
await handleEvents($element, isNewElement)
const text = getPropertyValue($element, '--cssx-text')
if (text) $element.textContent = text
const html = getPropertyValue($element, '--cssx-disgustingly-set-innerhtml')
if (html) $element.innerHTML = html.replace(/(^'|")|('|"$)/g, '')
const declarations = await getDeclarations(
$element,
getEvalActions($element, null),
)
if (declarations.length > 0) {
await createLayer(declarations, $element)
}
}
export interface Options {
root?: HTMLElement
}
export const render = async ({ root = document.body }: Options = {}) => {
injectStyles()
await manageElement(root)
}
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