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import { EvalActions, evalExpr } from './eval'
import { parse } from './parser'
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',
]
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)
}
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($element, '--cssx-children')
return value.split(/(\s*,\s*)|\s+/g).filter(Boolean)
}
const getEvalActions = ($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 (name, value) => {
$element.setAttribute(name, value)
},
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?
},
})
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) => {
console.log(`Triggered event: ${eventType}`)
const exprs = parse(handlerExpr)
for (const expr of exprs) {
await evalExpr(expr, getEvalActions($element, event))
}
}
if (eventType === 'mount') {
if (isNewElement) setTimeout(eventHandler)
} else {
;($element as any)[`on${eventType}`] = eventHandler
}
}
}
}
const 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 childrenIds = getChildrenIds($element)
if (childrenIds.length > 0) {
const LAYER_CLASS = 'cssx-layer'
const $childrenRoot =
$element.querySelector(`:scope > .${LAYER_CLASS}`) ??
Object.assign(document.createElement('div'), { className: LAYER_CLASS })
$element.appendChild($childrenRoot)
for (const childId of childrenIds) {
const selector = childId.split('#')
const [tag, id] = selector.length >= 2 ? selector : ['div', ...selector]
let $child = $childrenRoot.querySelector(`:scope > #${id}`)
const isNewElement = !$child
if (!$child) {
$child = Object.assign(document.createElement(tag || 'div'), { id })
}
$childrenRoot.appendChild($child)
await manageElement($child, isNewElement)
}
}
}
interface Options {
root?: HTMLElement
}
const render = async ({ root = document.body }: Options = {}) => {
injectStyles()
await manageElement(root)
}
render()
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