Vanilla HTM

Framework-free JSX syntax in pure JS using HTM and native DOM creation.
此腳本不應該直接安裝，它是一個供其他腳本使用的函式庫。欲使用本函式庫，請在腳本 metadata 寫上： // @require https://update.greasyfork.org/scripts/591770/1905406/Vanilla%20HTM.js
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換行
// ==UserScript==
// @name        Vanilla HTM
// @namespace   Violentmonkey Scripts
// @version     1.0.0
// @require     https://cdn.jsdelivr.net/npm/[email protected]/mini/index.umd.js
// @grant       none
// @author      Paesss
// @description Framework-free JSX syntax in pure JS using HTM and native DOM creation.
// ==/UserScript==

(function (global) {
  "use strict";

  const SVG_NS = "http://www.w3.org/2000/svg";

  // Standard SVG tags requiring the SVG namespace
  const SVG_TAGS = new Set([
    "svg",
    "path",
    "circle",
    "rect",
    "line",
    "polyline",
    "polygon",
    "ellipse",
    "g",
    "use",
    "text",
    "tspan",
    "symbol",
    "defs",
    "clipPath",
    "mask",
    "pattern",
    "marker",
    "foreignObject",
  ]);

  /**
   * Appends dynamic children into a parent DOM container
   */
  function appendChildren(parent, children) {
    for (let i = 0; i < children.length; i++) {
      const child = children[i];

      if (child == null || child === false || child === true) {
        continue;
      }

      if (Array.isArray(child)) {
        appendChildren(parent, child);
      } else if (child instanceof Node) {
        parent.appendChild(child);
      } else {
        parent.appendChild(document.createTextNode(String(child)));
      }
    }
  }

  /**
   * Enhanced Hyperscript factory function
   */
  function h(tag, props, ...children) {
    // 1. Functional Components
    if (typeof tag === "function") {
      const normalizedProps = Object.assign({}, props);
      normalizedProps.children = children.length === 1 ? children[0] : children;
      return tag(normalizedProps);
    }

    // 2. Document Fragments (<>...</>)
    if (!tag) {
      const fragment = document.createDocumentFragment();
      appendChildren(fragment, children);
      return fragment;
    }

    // 3. Namespace Resolution (SVG Support)
    const isSvg = typeof tag === "string" && SVG_TAGS.has(tag);
    const el = isSvg
      ? document.createElementNS(SVG_NS, tag)
      : document.createElement(tag);

    // 4. Property & Attribute Binding
    if (props) {
      for (let key in props) {
        const val = props[key];

        if (val === undefined || val === null) continue;

        // Ref Callback / Object
        if (key === "ref") {
          if (typeof val === "function") val(el);
          else if (val && typeof val === "object") val.current = el;
          continue;
        }

        // Forced Property Set (.value, .checked, etc.)
        if (key.charCodeAt(0) === 46 /* '.' */) {
          el[key.slice(1)] = val;
          continue;
        }

        // Event Listeners (e.g. onClick, onInput)
        if (
          key.charCodeAt(0) === 111 /* 'o' */ &&
          key.charCodeAt(1) === 110 /* 'n' */
        ) {
          const eventName = key.slice(2).toLowerCase();
          el.addEventListener(eventName, val);
          continue;
        }

        // Attribute Normalization
        let attrName = key;
        if (key === "className") attrName = "class";
        else if (key === "htmlFor") attrName = "for";

        // Style Props (Object or String)
        if (key === "style") {
          if (typeof val === "object" && val !== null) {
            Object.assign(el.style, val);
          } else {
            el.style.cssText = String(val);
          }
          continue;
        }

        // Dataset Attributes
        if (key === "dataset" && typeof val === "object") {
          Object.assign(el.dataset, val);
          continue;
        }

        // Boolean Attributes
        if (typeof val === "boolean") {
          if (val) {
            el.setAttribute(attrName, "");
            if (attrName in el) el[attrName] = true;
          } else {
            el.removeAttribute(attrName);
            if (attrName in el) el[attrName] = false;
          }
          continue;
        }

        // Standard Properties vs Attributes
        if (
          attrName in el &&
          !isSvg &&
          attrName !== "list" &&
          attrName !== "form"
        ) {
          try {
            el[attrName] = val;
          } catch {
            el.setAttribute(attrName, String(val));
          }
        } else {
          el.setAttribute(attrName, String(val));
        }
      }
    }

    // 5. Append Children
    appendChildren(el, children);

    return el;
  }

  // Bind HTM to the hyperscript factory on the global scope
  global.html = typeof htm !== "undefined" ? htm.bind(h) : null;

})(
  // Universal Global Scope Resolution
  typeof globalThis !== "undefined" ? globalThis :
  typeof window !== "undefined" ? window :
  typeof self !== "undefined" ? self :
  this || {}
);