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import { Dependencies, evalExpr } from './eval'
import { parse } from './parser'
const UNSET_PROPERTY_VALUE = '<unset>'
const EVENT_HANDLERS = {
click: '--cssx-on-click',
load: '--cssx-on-load',
}
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 = ['--cssx-children', ...Object.values(EVENT_HANDLERS)]
$style.textContent = `.cssx-layer {
${properties.map((p) => `${p}: ${UNSET_PROPERTY_VALUE};`).join(' ')}
}`
document.body.appendChild($style)
}
const getPropertyValue = ($element: Element, prop: string) => {
const value = `${getComputedStyle($element).getPropertyValue(prop)}`.trim()
return !value || value === UNSET_PROPERTY_VALUE ? '' : value
}
const getChildrenIds = ($element: Element) => {
const value = getPropertyValue($element, '--cssx-children')
return value.split(/(\s*,\s*)|\s+/g).filter(Boolean)
}
const evalDeps = (_el: Element): Dependencies => ({
addClass: async (id, cls) => document.getElementById(id)?.classList.add(cls),
removeClass: async (id, cls) =>
document.getElementById(id)?.classList.remove(cls),
delay: (delay) => new Promise((res) => setTimeout(res, delay)),
jsEval: async (js) => (0, eval)(js),
})
const handleEvents = async ($element: Element) => {
for (const [event, property] of Object.entries(EVENT_HANDLERS)) {
const handlerExpr = getPropertyValue($element, property)
if (handlerExpr) {
;($element as any)[`on${event}`] = async () => {
console.log(`Triggered event: ${event}`)
const exprs = parse(handlerExpr)
for (const expr of exprs) {
await evalExpr(expr, evalDeps($element))
}
}
}
}
}
let nodeCount = 0
const manageElement = async ($element: Element) => {
if (nodeCount++ > 100) return // NOTE: Temporary. To prevent infinite rec
await handleEvents($element)
const childrenIds = getChildrenIds($element)
if (childrenIds.length > 0) {
const $childrenRoot =
$element.querySelector(':scope > .cssx-layer') ??
Object.assign(document.createElement('div'), {
className: 'cssx-layer',
})
$element.appendChild($childrenRoot)
for (const id of childrenIds) {
const $child =
$childrenRoot.querySelector(`:scope > #${id}`) ??
Object.assign(document.createElement('div'), { id })
$childrenRoot.appendChild($child)
await manageElement($child)
}
}
}
interface Options {
root?: HTMLElement
}
const render = async ({ root = document.body }: Options = {}) => {
injectStyles()
await manageElement(root)
}
render()
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