Vanilla XHTM

Framework-free JSX-like syntax in pure JS using XHTM and native DOM creation.
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// ==UserScript==
// @name         Vanilla XHTM
// @namespace    https://greasyfork.org/users/1635096-paesss
// @version      1.8.0
// @author       Paesss
// @description  Framework-free JSX-like syntax in pure JS using XHTM and native DOM creation.
// @license      MIT
// @match        *
// ==/UserScript==

/* ========================================================================
 * Bundled Library: XHTM ([email protected])
 * Copyright (c) 2019 Dmitry Yv.
 *
 * MIT License
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 * ======================================================================== */

(function () {
  "use strict";
  var FIELD = "";
  var QUOTES = "";
  var CACHE = new WeakMap();
  function htm(statics) {
    let tree = CACHE.get(statics);
    if (!tree) CACHE.set(statics, (tree = parse(statics)));
    let nodes = tree.map((node) => build(this, node, arguments));
    return nodes.length < 2 ? nodes[0] : nodes;
  }
  var build = (h, node, args) => {
    if (typeof node === "number") return args[node];
    if (typeof node !== "object") return node;
    let props = null;
    if (node.p) {
      props = {};
      for (let e of node.p)
        e.length < 2
          ? Object.assign(props, args[e[0]])
          : (props[part(e[0], args)] = part(e[1], args));
    }
    return h(part(node.t, args), props, ...node.c.map((c) => build(h, c, args)));
  };
  var part = (v, args) =>
    typeof v === "number"
      ? args[v]
      : Array.isArray(v)
        ? v
            .map(
              (x) => ((x = typeof x === "number" ? args[x] : x), x == null || x === false ? "" : x),
            )
            .join("")
        : v;
  var parse = (statics) => {
    let prev = 0,
      current = [null],
      field = 0,
      args,
      name,
      value,
      quotes = [],
      quote = 0,
      last,
      level = 0,
      pre = false;
    const evaluate = (str, parts = [], raw) => {
      let i = 0;
      str =
        !raw && str === QUOTES
          ? quotes[quote++].slice(1, -1)
          : str.replace(/\ue001/g, (m) => quotes[quote++]);
      if (!str) return str;
      str.replace(/\ue000/g, (match, idx) => {
        if (idx) parts.push(str.slice(i, idx));
        i = idx + 1;
        return parts.push(++field);
      });
      if (i < str.length) parts.push(str.slice(i));
      return parts.length > 1 ? parts : parts[0];
    };
    const up = () => {
      (args = current), (current = args[0]), (last = args[1]);
      current.push({
        t: last,
        p: args[2],
        c: args.slice(3),
      });
      if (pre === level--) pre = false;
    };
    let str = statics.join(FIELD);
    if (str.indexOf("<!") >= 0)
      str = str.replace(/<!--[^]*?-->/g, "").replace(/<!\[CDATA\[[^]*\]\]>/g, "");
    str = str.replace(/('|")[^\1]*?\1/g, (match) => (quotes.push(match), QUOTES));
    str.replace(/(?:^|>)((?:[^<]|<[^\w\ue000\/?!>])*)(?:$|<)/g, (match, text, idx, str) => {
      let tag, close;
      if (idx)
        str
          .slice(prev, idx)
          .replace(/(\S)\/$/, "$1 /")
          .split(/\s+/)
          .map((part, i) => {
            if (part[0] === "/") {
              part = part.slice(1);
              if (EMPTY[part]) return;
              close = tag || part || 1;
            } else if (!i) {
              tag = evaluate(part);
              if (typeof tag === "string") {
                tag = tag.toLowerCase();
                while (CLOSE[current[1] + tag]) up();
              }
              current = [current, tag, null];
              level++;
              if (!pre && PRE[tag]) pre = level;
              if (EMPTY[tag]) close = tag;
            } else if (part) {
              let props = current[2] || (current[2] = []);
              if (part.slice(0, 3) === "...") props.push([++field]);
              else {
                [name, value] = part.split("=");
                props.push([evaluate(name), value ? evaluate(value) : true]);
              }
            }
          });
      if (close) {
        if (!current[0]) err(`Wrong close tag \`${close}\``);
        up();
        while (last !== close && CLOSE[last]) up();
      }
      prev = idx + match.length;
      if (!pre) text = text.replace(/\s*\n\s*/g, "").replace(/\s+/g, " ");
      if (text) evaluate(((last = 0), text), current, true);
    });
    if (current[0] && CLOSE[current[1]]) up();
    if (level) err(`Unclosed \`${current[1]}\`.`);
    return current.slice(1);
  };
  var err = (msg) => {
    throw SyntaxError(msg);
  };
  var EMPTY = (htm.empty = {});
  var CLOSE = (htm.close = {});
  var PRE = (htm.pre = {});
  "area base basefont bgsound br col command embed frame hr image img input keygen link meta param source track wbr ! !doctype ? ?xml"
    .split(" ")
    .map((v) => (htm.empty[v] = true));
  var close = {
    li: "",
    dt: "dd",
    dd: "dt",
    p: "address article aside blockquote details div dl fieldset figcaption figure footer form h1 h2 h3 h4 h5 h6 header hgroup hr main menu nav ol pre section table",
    rt: "rp",
    rp: "rt",
    optgroup: "",
    option: "optgroup",
    caption: "tbody thead tfoot tr colgroup",
    colgroup: "thead tbody tfoot tr caption",
    thead: "tbody tfoot caption",
    tbody: "tfoot caption",
    tfoot: "caption",
    tr: "tbody tfoot",
    td: "th tr",
    th: "td tr tbody",
  };
  for (let tag in close)
    for (let closer of [...close[tag].split(" "), tag])
      htm.close[tag] = htm.close[tag + closer] = true;
  "pre textarea".split(" ").map((v) => (htm.pre[v] = true));
  var xhtm_default = htm;
  var SVG_NS = "http://www.w3.org/2000/svg";
  var SVG_TAGS = new Set([
    "svg",
    "path",
    "circle",
    "rect",
    "line",
    "polyline",
    "polygon",
    "ellipse",
    "g",
    "use",
    "text",
    "tspan",
    "symbol",
    "defs",
    "clipPath",
    "mask",
    "pattern",
    "marker",
    "foreignObject",
  ]);
  function appendChildren(parent, children) {
    for (let i = 0; i < children.length; i++) {
      const child = children[i];
      if (child == null || typeof child === "boolean") continue;
      if (Array.isArray(child)) appendChildren(parent, child);
      else if (child instanceof Node) parent.appendChild(child);
      else parent.appendChild(document.createTextNode(String(child)));
    }
  }
  function h(tag, props, ...children) {
    if (typeof tag === "function") {
      const normalizedProps = Object.assign({}, props);
      normalizedProps.children =
        children.length === 0 ? void 0 : children.length === 1 ? children[0] : children;
      return tag(normalizedProps);
    }
    if (!tag) {
      const fragment = document.createDocumentFragment();
      appendChildren(fragment, children);
      return fragment;
    }
    const isSvg = typeof tag === "string" && SVG_TAGS.has(tag);
    const el = isSvg ? document.createElementNS(SVG_NS, tag) : document.createElement(tag);
    if (props)
      for (const key in props) {
        const val = props[key];
        if (val === void 0 || val === null) continue;
        if (key === "ref") {
          if (typeof val === "function") val(el);
          else if (val && typeof val === "object") val.current = el;
          continue;
        }
        if (key.charCodeAt(0) === 46) {
          el[key.slice(1)] = val;
          continue;
        }
        if (key.charCodeAt(0) === 111 && key.charCodeAt(1) === 110) {
          const eventName = key.slice(2).toLowerCase();
          el.addEventListener(eventName, val);
          continue;
        }
        let attrName = key;
        if (key === "className") attrName = "class";
        else if (key === "htmlFor") attrName = "for";
        if (key === "style") {
          const styledEl = el;
          if (typeof val === "object" && val !== null) Object.assign(styledEl.style, val);
          else styledEl.style.cssText = String(val);
          continue;
        }
        if (key === "dataset" && typeof val === "object") {
          Object.assign(el.dataset, val);
          continue;
        }
        if (typeof val === "boolean") {
          if (val) el.setAttribute(attrName, "");
          else el.removeAttribute(attrName);
          continue;
        }
        if (!isSvg && attrName in el && attrName !== "list" && attrName !== "form")
          try {
            el[attrName] = val;
          } catch (_) {
            el.setAttribute(attrName, String(val));
          }
        else el.setAttribute(attrName, String(val));
      }
    appendChildren(el, children);
    return el;
  }
  ((global) => {
    global.html = xhtm_default.bind(h);
  })(typeof globalThis !== "undefined" ? globalThis : window);
})();