:wrench: Build the server component runtime.

1 files changed, 542 insertions, 0 deletions

diff --git a/priv/static/lustre-server-component.mjs b/priv/static/lustre-server-component.mjs
new file mode 100644
index 0000000..aeb7d63
--- /dev/null
+++ b/priv/static/lustre-server-component.mjs
@@ -0,0 +1,542 @@
+// build/dev/javascript/lustre/lustre/internals/constants.mjs
+var diff = 0;
+var emit = 1;
+var init = 2;
+var event = 4;
+var attrs = 5;
+
+// build/dev/javascript/prelude.mjs
+var CustomType = class {
+  withFields(fields) {
+    let properties = Object.keys(this).map(
+      (label) => label in fields ? fields[label] : this[label]
+    );
+    return new this.constructor(...properties);
+  }
+};
+var List = class {
+  static fromArray(array, tail) {
+    let t = tail || new Empty();
+    return array.reduceRight((xs, x) => new NonEmpty(x, xs), t);
+  }
+  [Symbol.iterator]() {
+    return new ListIterator(this);
+  }
+  toArray() {
+    return [...this];
+  }
+  atLeastLength(desired) {
+    for (let _ of this) {
+      if (desired <= 0)
+        return true;
+      desired--;
+    }
+    return desired <= 0;
+  }
+  hasLength(desired) {
+    for (let _ of this) {
+      if (desired <= 0)
+        return false;
+      desired--;
+    }
+    return desired === 0;
+  }
+  countLength() {
+    let length2 = 0;
+    for (let _ of this)
+      length2++;
+    return length2;
+  }
+};
+var ListIterator = class {
+  #current;
+  constructor(current) {
+    this.#current = current;
+  }
+  next() {
+    if (this.#current instanceof Empty) {
+      return { done: true };
+    } else {
+      let { head, tail } = this.#current;
+      this.#current = tail;
+      return { value: head, done: false };
+    }
+  }
+};
+var Empty = class extends List {
+};
+var NonEmpty = class extends List {
+  constructor(head, tail) {
+    super();
+    this.head = head;
+    this.tail = tail;
+  }
+};
+var Result = class _Result extends CustomType {
+  static isResult(data) {
+    return data instanceof _Result;
+  }
+};
+var Ok = class extends Result {
+  constructor(value) {
+    super();
+    this[0] = value;
+  }
+  isOk() {
+    return true;
+  }
+};
+var Error = class extends Result {
+  constructor(detail) {
+    super();
+    this[0] = detail;
+  }
+  isOk() {
+    return false;
+  }
+};
+
+// build/dev/javascript/gleam_stdlib/dict.mjs
+var tempDataView = new DataView(new ArrayBuffer(8));
+var SHIFT = 5;
+var BUCKET_SIZE = Math.pow(2, SHIFT);
+var MASK = BUCKET_SIZE - 1;
+var MAX_INDEX_NODE = BUCKET_SIZE / 2;
+var MIN_ARRAY_NODE = BUCKET_SIZE / 4;
+
+// build/dev/javascript/gleam_stdlib/gleam/result.mjs
+function map2(result, fun) {
+  if (result.isOk()) {
+    let x = result[0];
+    return new Ok(fun(x));
+  } else {
+    let e = result[0];
+    return new Error(e);
+  }
+}
+
+// build/dev/javascript/lustre/vdom.ffi.mjs
+function morph(prev, curr, dispatch, parent) {
+  if (curr?.tag && prev?.nodeType === 1) {
+    const nodeName = curr.tag.toUpperCase();
+    const ns = curr.namespace || "http://www.w3.org/1999/xhtml";
+    if (prev.nodeName === nodeName && prev.namespaceURI == ns) {
+      return morphElement(prev, curr, dispatch, parent);
+    } else {
+      return createElement(prev, curr, dispatch, parent);
+    }
+  }
+  if (curr?.tag) {
+    return createElement(prev, curr, dispatch, parent);
+  }
+  if (typeof curr?.content === "string") {
+    return prev?.nodeType === 3 ? morphText(prev, curr) : createText(prev, curr);
+  }
+  return document.createComment(
+    [
+      "[internal lustre error] I couldn't work out how to render this element. This",
+      "function should only be called internally by lustre's runtime: if you think",
+      "this is an error, please open an issue at",
+      "https://github.com/hayleigh-dot-dev/gleam-lustre/issues/new"
+    ].join(" ")
+  );
+}
+function patch(root, diff2, dispatch) {
+  for (const created of diff2[0]) {
+    const key = created[0];
+    if (key === "0") {
+      morph(root, created[1], dispatch, root.parentNode);
+    } else {
+      const segments = Array.from(key);
+      const parentKey = segments.slice(0, -1).join("");
+      const indexKey = segments.slice(-1)[0];
+      const prev = root.querySelector(`[data-lustre-key="${key}"]`) ?? root.querySelector(`[data-lustre-key="${parentKey}"]`).childNodes[indexKey];
+      morph(prev, created[1], dispatch, prev.parentNode);
+    }
+  }
+  for (const removed of diff2[1]) {
+    const key = removed[0];
+    const segments = Array.from(key);
+    const parentKey = segments.slice(0, -1).join("");
+    const indexKey = segments.slice(-1)[0];
+    const prev = root.querySelector(`[data-lustre-key="${key}"]`) ?? root.querySelector(`[data-lustre-key="${parentKey}"]`).childNodes[indexKey];
+    prev.remove();
+  }
+  for (const updated of diff2[2]) {
+    const key = updated[0];
+    const prev = key === "0" ? root : root.querySelector(`[data-lustre-key="${key}"]`);
+    prev.$lustre ??= { __registered_events: /* @__PURE__ */ new Set() };
+    for (const created of updated[0]) {
+      morphAttr(prev, created.name, created.value, dispatch);
+    }
+    for (const removed of updated[1]) {
+      if (prev.$lustre.__registered_events.has(removed)) {
+        const event2 = removed.slice(2).toLowerCase();
+        prev.removeEventListener(event2, prev.$lustre[`${removed}Handler`]);
+        prev.$lustre.__registered_events.delete(removed);
+        delete prev.$lustre[removed];
+        delete prev.$lustre[`${removed}Handler`];
+      } else {
+        prev.removeAttribute(removed);
+      }
+    }
+  }
+  return root;
+}
+function createElement(prev, curr, dispatch, parent = null) {
+  const el = curr.namespace ? document.createElementNS(curr.namespace, curr.tag) : document.createElement(curr.tag);
+  el.$lustre = {
+    __registered_events: /* @__PURE__ */ new Set()
+  };
+  let dangerousUnescapedHtml = "";
+  for (const attr of curr.attrs) {
+    if (attr[0] === "class") {
+      morphAttr(el, attr[0], `${el.className} ${attr[1]}`);
+    } else if (attr[0] === "style") {
+      morphAttr(el, attr[0], `${el.style.cssText} ${attr[1]}`);
+    } else if (attr[0] === "dangerous-unescaped-html") {
+      dangerousUnescapedHtml += attr[1];
+    } else if (attr[0] !== "") {
+      morphAttr(el, attr[0], attr[1], dispatch);
+    }
+  }
+  if (customElements.get(curr.tag)) {
+    el._slot = curr.children;
+  } else if (curr.tag === "slot") {
+    let children = new Empty();
+    let parentWithSlot = parent;
+    while (parentWithSlot) {
+      if (parentWithSlot._slot) {
+        children = parentWithSlot._slot;
+        break;
+      } else {
+        parentWithSlot = parentWithSlot.parentNode;
+      }
+    }
+    for (const child of children) {
+      el.appendChild(morph(null, child, dispatch, el));
+    }
+  } else if (dangerousUnescapedHtml) {
+    el.innerHTML = dangerousUnescapedHtml;
+  } else {
+    for (const child of curr.children) {
+      el.appendChild(morph(null, child, dispatch, el));
+    }
+  }
+  if (prev)
+    prev.replaceWith(el);
+  return el;
+}
+function morphElement(prev, curr, dispatch, parent) {
+  const prevAttrs = prev.attributes;
+  const currAttrs = /* @__PURE__ */ new Map();
+  prev.$lustre ??= { __registered_events: /* @__PURE__ */ new Set() };
+  for (const currAttr of curr.attrs) {
+    if (currAttr[0] === "class" && currAttrs.has("class")) {
+      currAttrs.set(currAttr[0], `${currAttrs.get("class")} ${currAttr[1]}`);
+    } else if (currAttr[0] === "style" && currAttrs.has("style")) {
+      currAttrs.set(currAttr[0], `${currAttrs.get("style")} ${currAttr[1]}`);
+    } else if (currAttr[0] === "dangerous-unescaped-html" && currAttrs.has("dangerous-unescaped-html")) {
+      currAttrs.set(
+        currAttr[0],
+        `${currAttrs.get("dangerous-unescaped-html")} ${currAttr[1]}`
+      );
+    } else if (currAttr[0] !== "") {
+      currAttrs.set(currAttr[0], currAttr[1]);
+    }
+  }
+  for (const { name } of prevAttrs) {
+    if (!currAttrs.has(name)) {
+      prev.removeAttribute(name);
+    } else {
+      const value = currAttrs.get(name);
+      morphAttr(prev, name, value, dispatch);
+      currAttrs.delete(name);
+    }
+  }
+  for (const name of prev.$lustre.__registered_events) {
+    if (!currAttrs.has(name)) {
+      const event2 = name.slice(2).toLowerCase();
+      prev.removeEventListener(event2, prev.$lustre[`${name}Handler`]);
+      prev.$lustre.__registered_events.delete(name);
+      delete prev.$lustre[name];
+      delete prev.$lustre[`${name}Handler`];
+    }
+  }
+  for (const [name, value] of currAttrs) {
+    morphAttr(prev, name, value, dispatch);
+  }
+  if (customElements.get(curr.tag)) {
+    prev._slot = curr.children;
+  } else if (curr.tag === "slot") {
+    let prevChild = prev.firstChild;
+    let currChild = new Empty();
+    let parentWithSlot = parent;
+    while (parentWithSlot) {
+      if (parentWithSlot._slot) {
+        currChild = parentWithSlot._slot;
+        break;
+      } else {
+        parentWithSlot = parentWithSlot.parentNode;
+      }
+    }
+    while (prevChild) {
+      if (Array.isArray(currChild) && currChild.length) {
+        morph(prevChild, currChild.shift(), dispatch, prev);
+      } else if (currChild.head) {
+        morph(prevChild, currChild.head, dispatch, prev);
+        currChild = currChild.tail;
+      }
+      prevChild = prevChild.nextSibling;
+    }
+    for (const child of currChild) {
+      prev.appendChild(morph(null, child, dispatch, prev));
+    }
+  } else if (currAttrs.has("dangerous-unescaped-html")) {
+    prev.innerHTML = currAttrs.get("dangerous-unescaped-html");
+  } else {
+    let prevChild = prev.firstChild;
+    let currChild = curr.children;
+    while (prevChild) {
+      if (Array.isArray(currChild) && currChild.length) {
+        const next = prevChild.nextSibling;
+        morph(prevChild, currChild.shift(), dispatch, prev);
+        prevChild = next;
+      } else if (currChild.head) {
+        const next = prevChild.nextSibling;
+        morph(prevChild, currChild.head, dispatch, prev);
+        currChild = currChild.tail;
+        prevChild = next;
+      } else {
+        const next = prevChild.nextSibling;
+        prevChild.remove();
+        prevChild = next;
+      }
+    }
+    for (const child of currChild) {
+      prev.appendChild(morph(null, child, dispatch, prev));
+    }
+  }
+  return prev;
+}
+function morphAttr(el, name, value, dispatch) {
+  switch (typeof value) {
+    case (name.startsWith("data-lustre-on-") && "string"): {
+      if (!value) {
+        el.removeAttribute(name);
+        el.removeEventListener(event2, el.$lustre[`${name}Handler`]);
+        break;
+      }
+      if (el.hasAttribute(name))
+        break;
+      const event2 = name.slice(15).toLowerCase();
+      const handler = (e) => dispatch(serverEventHandler(e));
+      if (el.$lustre[`${name}Handler`]) {
+        el.removeEventListener(event2, el.$lustre[`${name}Handler`]);
+      }
+      el.addEventListener(event2, handler);
+      el.$lustre[name] = value;
+      el.$lustre[`${name}Handler`] = handler;
+      el.$lustre.__registered_events.add(name);
+      el.setAttribute(name, value);
+      break;
+    }
+    case "string":
+      if (name === "value")
+        el.value = value;
+      if (value === "") {
+        el.removeAttribute(name);
+      } else {
+        el.setAttribute(name, value);
+      }
+      break;
+    case (name.startsWith("on") && "function"): {
+      if (el.$lustre[name] === value)
+        break;
+      const event2 = name.slice(2).toLowerCase();
+      const handler = (e) => map2(value(e), dispatch);
+      if (el.$lustre[`${name}Handler`]) {
+        el.removeEventListener(event2, el.$lustre[`${name}Handler`]);
+      }
+      el.addEventListener(event2, handler);
+      el.$lustre[name] = value;
+      el.$lustre[`${name}Handler`] = handler;
+      el.$lustre.__registered_events.add(name);
+      break;
+    }
+    default:
+      el[name] = value;
+  }
+}
+function createText(prev, curr) {
+  const el = document.createTextNode(curr.content);
+  if (prev)
+    prev.replaceWith(el);
+  return el;
+}
+function morphText(prev, curr) {
+  const prevValue = prev.nodeValue;
+  const currValue = curr.content;
+  if (!currValue) {
+    prev?.remove();
+    return null;
+  }
+  if (prevValue !== currValue)
+    prev.nodeValue = currValue;
+  return prev;
+}
+function serverEventHandler(event2) {
+  const el = event2.target;
+  const tag = el.getAttribute(`data-lustre-on-${event2.type}`);
+  const data = JSON.parse(el.getAttribute("data-lustre-data") || "{}");
+  const include = JSON.parse(el.getAttribute("data-lustre-include") || "[]");
+  switch (event2.type) {
+    case "input":
+    case "change":
+      include.push("target.value");
+      break;
+  }
+  return {
+    tag,
+    data: include.reduce((data2, property) => {
+      const path = property.split(".");
+      for (let i = 0, o = data2, e = event2; i < path.length; i++) {
+        if (i === path.length - 1) {
+          o[path[i]] = e[path[i]];
+        } else {
+          o[path[i]] ??= {};
+          e = e[path[i]];
+          o = o[path[i]];
+        }
+      }
+      return data2;
+    }, data)
+  };
+}
+
+// src/server-component.mjs
+var LustreServerComponent = class extends HTMLElement {
+  static get observedAttributes() {
+    return ["route"];
+  }
+  #observer = null;
+  #root = null;
+  #socket = null;
+  constructor() {
+    super();
+    this.#observer = new MutationObserver((mutations) => {
+      const changed = [];
+      for (const mutation of mutations) {
+        if (mutation.type === "attributes") {
+          const { attributeName: name, oldValue: prev } = mutation;
+          const next = this.getAttribute(name);
+          if (prev !== next) {
+            try {
+              changed.push([name, JSON.parse(next)]);
+            } catch {
+              changed.push([name, next]);
+            }
+          }
+        }
+      }
+      if (changed.length) {
+        this.#socket?.send(JSON.stringify([attrs, changed]));
+      }
+    });
+  }
+  connectedCallback() {
+    this.#root = document.createElement("div");
+    this.appendChild(this.#root);
+  }
+  attributeChangedCallback(name, prev, next) {
+    switch (name) {
+      case "route": {
+        if (!next) {
+          this.#socket?.close();
+          this.#socket = null;
+        } else if (prev !== next) {
+          const id = this.getAttribute("id");
+          const route = next + (id ? `?id=${id}` : "");
+          this.#socket?.close();
+          this.#socket = new WebSocket(`ws://${window.location.host}${route}`);
+          this.#socket.addEventListener(
+            "message",
+            (message) => this.messageReceivedCallback(message)
+          );
+        }
+      }
+    }
+  }
+  messageReceivedCallback({ data }) {
+    const [kind, ...payload] = JSON.parse(data);
+    switch (kind) {
+      case diff:
+        return this.diff(payload);
+      case emit:
+        return this.emit(payload);
+      case init:
+        return this.init(payload);
+    }
+  }
+  init([attrs2, vdom]) {
+    const initial = [];
+    for (const attr of attrs2) {
+      if (attr in this) {
+        initial.push([attr, this[attr]]);
+      } else if (this.hasAttribute(attr)) {
+        initial.push([attr, this.getAttribute(attr)]);
+      }
+      Object.defineProperty(this, attr, {
+        get() {
+          return this[`_${attr}`] ?? this.getAttribute(attr);
+        },
+        set(value) {
+          const prev = this[attr];
+          if (typeof value === "string") {
+            this.setAttribute(attr, value);
+          } else {
+            this[`_${attr}`] = value;
+          }
+          if (prev !== value) {
+            this.#socket?.send(
+              JSON.stringify([attrs, [[attr, value]]])
+            );
+          }
+        }
+      });
+    }
+    this.#observer.observe(this, {
+      attributeFilter: attrs2,
+      attributeOldValue: true,
+      attributes: true,
+      characterData: false,
+      characterDataOldValue: false,
+      childList: false,
+      subtree: false
+    });
+    this.morph(vdom);
+    if (initial.length) {
+      this.#socket?.send(JSON.stringify([attrs, initial]));
+    }
+  }
+  morph(vdom) {
+    this.#root = morph(this.#root, vdom, (msg) => {
+      this.#socket?.send(JSON.stringify([event, msg.tag, msg.data]));
+    });
+  }
+  diff([diff2]) {
+    this.#root = patch(this.#root, diff2, (msg) => {
+      this.#socket?.send(JSON.stringify([event, msg.tag, msg.data]));
+    });
+  }
+  emit([event2, data]) {
+    this.dispatchEvent(new CustomEvent(event2, { detail: data }));
+  }
+  disconnectedCallback() {
+    this.#socket?.close();
+  }
+};
+window.customElements.define("lustre-server-component", LustreServerComponent);
+export {
+  LustreServerComponent
+};