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feat: templating (#9)

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Ayo Ayco 2023-12-08 21:31:05 +01:00 committed by GitHub
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9 changed files with 295 additions and 7 deletions
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12
examples/templating/index.html Normal file
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@ -0,0 +1,12 @@
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>WC demo</title>
<script type="module" src="./index.js"></script>
</head>
<body>
<my-counter></my-counter>
</body>
</html>

16
examples/templating/index.js Normal file
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@ -0,0 +1,16 @@
import { WebComponent, html } from "../../src/index.js";
export class Counter extends WebComponent {
static props = {
count: 123,
};
get template() {
return html`
<button on:click=${() => ++this.props.count}>
${this.props.count}
</button>
`;
}
}
customElements.define("my-counter", Counter);

2
package.json
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@ -1,6 +1,6 @@
{
"name": "web-component-base",
"version": "2.0.0-beta.6",
"version": "2.0.0-beta.7",
"description": "A zero-dependency, ~600 Bytes (minified & gzipped), JS base class for creating reactive custom elements easily",
"type": "module",
"exports": {

29
src/WebComponent.js
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@ -1,4 +1,4 @@
import { getKebabCase, getCamelCase, serialize, deserialize } from "./utils/index.js";
import { createElement, getKebabCase, getCamelCase, serialize, deserialize } from "./utils/index.js";
/**
* A minimal base class to reduce the complexity of creating reactive custom elements
@ -69,11 +69,7 @@ export class WebComponent extends HTMLElement {
*/
onChanges(changes) {}
render() {
if (typeof this.template === "string") this.innerHTML = this.template;
}
constructor() {
constructor() {
super();
this.#initializeProps();
}
@ -175,4 +171,25 @@ export class WebComponent extends HTMLElement {
);
}
}
#prevDOM;
render() {
if (typeof this.template === "string") {
this.innerHTML = this.template;
return;
} else if (typeof this.template === 'object') {
const tree = this.template;
// TODO: smart diffing
if (JSON.stringify(this.prev) !== JSON.stringify(tree)) {
// render
const el = createElement(tree);
if (el) {
if (Array.isArray(el)) this.replaceChildren(...el);
else this.replaceChildren(el);
}
this.#prevDOM = tree;
}
}
}
}

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src/html.js Normal file
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/**
* htm -- https://github.com/developit/htm
* For license information please see ./vendors/htm/LICENSE.txt
*/
const htm=(new Map,function(n){for(var e,l,s=arguments,t=1,u="",r="",o=[0],f=function(n){1===t&&(n||(u=u.replace(/^\s*\n\s*|\s*\n\s*$/g,"")))?o.push(n?s[n]:u):3===t&&(n||u)?(o[1]=n?s[n]:u,t=2):2===t&&"..."===u&&n?o[2]=Object.assign(o[2]||{},s[n]):2===t&&u&&!n?(o[2]=o[2]||{})[u]=!0:t>=5&&(5===t?((o[2]=o[2]||{})[l]=n?u?u+s[n]:s[n]:u,t=6):(n||u)&&(o[2][l]+=n?u+s[n]:u)),u=""},i=0;i<n.length;i++){i&&(1===t&&f(),f(i));for(var p=0;p<n[i].length;p++)e=n[i][p],1===t?"<"===e?(f(),o=[o,"",null],t=3):u+=e:4===t?"--"===u&&">"===e?(t=1,u=""):u=e+u[0]:r?e===r?r="":u+=e:'"'===e||"'"===e?r=e:">"===e?(f(),t=1):t&&("="===e?(t=5,l=u,u=""):"/"===e&&(t<5||">"===n[i][p+1])?(f(),3===t&&(o=o[0]),t=o,(o=o[0]).push(this.apply(null,t.slice(1))),t=0):" "===e||"\t"===e||"\n"===e||"\r"===e?(f(),t=2):u+=e),3===t&&"!--"===u&&(t=4,o=o[0])}return f(),o.length>2?o.slice(1):o[1]});
function h(type, props, ...children) {
return {type, props, children};
}
export const html = htm.bind(h);

1
src/index.js
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@ -1,2 +1,3 @@
export { attachEffect } from "./attach-effect.js";
export { WebComponent } from "./WebComponent.js";
export { html } from "./html.js";

28
src/utils/create-element.js Normal file
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@ -0,0 +1,28 @@
export function createElement(tree) {
if (!tree.type) {
const leaves = typeof tree === "object" ? Object.keys(tree) : [];
if (leaves?.length > 1) {
return leaves.map((leaf) => createElement(tree[leaf]));
}
return document.createTextNode(tree);
} else {
const el = document.createElement(tree.type);
const eventAttrs = tree.props
? Object.keys(tree.props)
.filter((key) => key.startsWith("on:"))
.map((key) => ({ key, cb: tree.props[key] }))
: [];
eventAttrs.forEach((onEvent) => {
const { key, cb } = onEvent;
const eventId = key.replace("on:", "");
el.addEventListener(eventId, cb);
});
tree.children?.forEach((child) => {
const childEl = createElement(child);
if (childEl) {
el.appendChild(childEl);
}
});
return el;
}
}

1
src/utils/index.js
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@ -2,3 +2,4 @@ export { serialize } from "./serialize.js";
export { deserialize } from "./deserialize.js";
export { getCamelCase } from "./get-camel-case.js";
export { getKebabCase } from "./get-kebab-case.js";
export {createElement} from "./create-element.js";

202
src/vendors/htm/LICENSE.txt vendored Normal file
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@ -0,0 +1,202 @@
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