From f18f3fee8844df98a30c2d248dfca04643dd4365 Mon Sep 17 00:00:00 2001
From: ivar <i@oiee.no>
Date: Mon, 6 Oct 2025 12:06:46 +0200
Subject: Initial

---
 VegaData/wwwroot/framework.js | 150 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 150 insertions(+)
 create mode 100644 VegaData/wwwroot/framework.js

(limited to 'VegaData/wwwroot/framework.js')

diff --git a/VegaData/wwwroot/framework.js b/VegaData/wwwroot/framework.js
new file mode 100644
index 0000000..e1652d0
--- /dev/null
+++ b/VegaData/wwwroot/framework.js
@@ -0,0 +1,150 @@
+const targetMap = new WeakMap();
+let activeEffect = null;
+
+const root = document.getElementById("root");
+
+function createElement(tagName, props = {}, children = []) {
+	const el = document.createElement(tagName);
+
+	for (const [key, value] of Object.entries(props || {})) {
+		if (key.startsWith("on") && typeof value === "function") {
+			el.addEventListener(key.substring(2).toLowerCase(), value);
+		} else if (key === "style" && typeof value === "object") {
+			Object.assign(el.style, value);
+		} else {
+			el.setAttribute(key, value);
+		}
+	}
+
+	const appendChild = (child) => {
+		if (Array.isArray(child)) {
+			child.forEach(appendChild);
+		} else if (typeof child === "function") {
+			const placeholder = document.createTextNode("");
+			el.appendChild(placeholder);
+			e(() => {
+				placeholder.textContent = child() ?? "";
+			});
+		} else if (child instanceof Node) {
+			el.appendChild(child);
+		} else if (child != null) {
+			el.appendChild(document.createTextNode(String(child)));
+		}
+	};
+
+	children.forEach(appendChild);
+	return el;
+}
+
+function track(target, key) {
+	if (!activeEffect) {
+		return;
+	}
+	let depsMap = targetMap.get(target);
+	if (!depsMap) {
+		depsMap = new Map();
+		targetMap.set(target, depsMap);
+	}
+
+	let dep = depsMap.get(key);
+	if (!dep) {
+		dep = new Set();
+		depsMap.set(key, dep);
+	}
+
+	dep.add(activeEffect);
+}
+
+function trigger(target, key) {
+	const depsMap = targetMap.get(target);
+	if (!depsMap) {
+		return;
+	}
+
+	const dep = depsMap.get(key);
+	if (dep) {
+		dep.forEach((effect) => effect());
+	}
+}
+
+//**
+// Create a reactive value, the value is at .value.
+// To use this in element props you need to supply the .value read as a function.
+// */
+export function r(target) {
+	target = {value: target};
+	return new Proxy(target, {
+		get(obj, key, receiver) {
+			track(obj, key);
+			return Reflect.get(obj, key, receiver);
+		},
+		set(obj, key, value, receiver) {
+			const result = Reflect.set(obj, key, value, receiver);
+			trigger(obj, key);
+			return result;
+		},
+	});
+}
+
+//**
+// Run code when value changes
+// */
+export function e(fn) {
+	let active = true;
+
+	const runner = () => {
+		if (active) {
+			activeEffect = runner;
+			fn();
+			activeEffect = null;
+		}
+	};
+
+	runner();
+
+	runner.stop = () => {
+		active = false;
+	};
+
+	return runner;
+}
+
+//**
+// Combine elements
+// */
+export function c(a, b) {
+	const normalize = (x) => (x == null ? [] : Array.isArray(x) ? x : [x]);
+
+	return [...normalize(a), ...normalize(b)];
+}
+
+//**
+// Mount element to a target (target is #root by default)
+// */
+export async function m(component, target = root) {
+	if (typeof component === "function") {
+		component = await component();
+	}
+	if (Array.isArray(component)) {
+		target.append(...component);
+	} else {
+		target.appendChild(component);
+	}
+}
+
+export function css(styleObject) {
+	return Object.entries(styleObject).map(([key, value]) => {
+		const kebabKey = key.replace(/([a-z])([A-Z])/g, "$1-$2").toLowerCase();
+		return `${kebabKey}: ${value}`;
+	}).join("; ");
+}
+
+//**
+// Create element
+// */
+export function t(name, props, ...children) {
+	if (typeof name === "function") {
+		return name({...props, children});
+	}
+	return createElement(name, props, children);
+}
-- 
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