load wasm only when running code

js/interactive-examples.js

@@ -1,62 +1,77 @@
 import phpBinary from "/js/php-web.mjs";
 
 function createOutput(output) {
-  const container = document.createElement('div');
-  container.classList.add('screen', 'example-contents');
-  const title = document.createElement('p');
-  title.innerText = 'Output: ';
-  container.appendChild(title)
-  const div = document.createElement('div');
-  div.classList.add('examplescode');
+  const container = document.createElement("div");
+  container.classList.add("screen", "example-contents");
+  const title = document.createElement("p");
+  title.innerText = "Output: ";
+  container.appendChild(title);
+  const div = document.createElement("div");
+  div.classList.add("examplescode");
   container.appendChild(div);
-  const pre = document.createElement('pre');
-  pre.classList.add('examplescode');
+  const pre = document.createElement("pre");
+  pre.classList.add("examplescode");
   pre.innerText = output;
-  div.appendChild(pre)
+  div.appendChild(pre);
   return container;
 }
 
-async function main() {
-  const buffer = [];
-  const { ccall } = await phpBinary({
-    print(data) {
-      if (!data) {
-        return;
-      }
-
-      if (buffer.length) {
-        buffer.push('\n');
-      }
-      buffer.push(data);
+class PHP {
+  static buffer = [];
+  static runPhp = null;
+  static async loadPhp() {
+    if (PHP.runPhp) {
+      return PHP.runPhp;
     }
-  })
 
-  console.log("PHP wasm %s loaded.", ccall("phpw_exec", "string", ["string"], ["phpversion();"]));
-  let lastOutput = null
+    const { ccall } = await phpBinary({
+      print(data) {
+        if (!data) {
+          return;
+        }
+
+        if (PHP.buffer.length) {
+          PHP.buffer.push("\n");
+        }
+        PHP.buffer.push(data);
+      },
+    });
 
-  document.querySelectorAll('.example').forEach((example) => {
-    const button = document.createElement('button');
-    button.setAttribute('type', 'button')
-    const phpcode = example.querySelector('.phpcode');
+    console.log(
+      "PHP wasm %s loaded.",
+      ccall("phpw_exec", "string", ["string"], ["phpversion();"]),
+    );
+    PHP.runPhp = (code) => ccall("phpw_run", null, ["string"], ["?>" + code]);
+    return PHP.runPhp;
+  }
+}
+
+async function main() {
+  let lastOutput = null;
 
-    const code = phpcode.querySelector('pre code')
-    code.setAttribute('contentEditable', true)
+  document.querySelectorAll(".example").forEach((example) => {
+    const button = document.createElement("button");
+    button.setAttribute("type", "button");
+    const phpcode = example.querySelector(".phpcode");
 
-    button.innerText = 'Run code';
-    button.onclick = function() {
+    const code = phpcode.querySelector("code");
+    code.setAttribute("contentEditable", true);
+
+    button.innerText = "Run code";
+    button.onclick = async function () {
       if (lastOutput && lastOutput.parentNode) {
-        lastOutput.remove()
+        lastOutput.remove();
       }
 
-      ccall("phpw_run", null, ["string"], ['?>' + phpcode.innerText]);
-      lastOutput = createOutput(buffer.join(''))
+      const runPhp = await PHP.loadPhp();
+      runPhp(phpcode.innerText);
+      lastOutput = createOutput(PHP.buffer.join(""));
       phpcode.parentNode.appendChild(lastOutput);
-      buffer.length = 0;
+      PHP.buffer.length = 0;
     };
 
     phpcode.before(button);
   });
-
 }
 
-main()
+main();