1 files changed, 115 insertions, 0 deletions
diff --git a/demo/wat2wasm/demo.js b/demo/wat2wasm/demo.js
new file mode 100644
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--- /dev/null
+++ b/demo/wat2wasm/demo.js
@@ -0,0 +1,115 @@
+/*
+ * Copyright 2016 WebAssembly Community Group participants
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+var kCompileMinMS = 100;
+
+var editorEl = document.querySelector('.editor');
+var outputEl = document.getElementById('output');
+var selectEl = document.getElementById('select');
+var downloadEl = document.getElementById('download');
+var downloadLink = document.getElementById('downloadLink');
+var binaryBuffer = null;
+var binaryBlobUrl = null;
+
+var wasmInstance = null;
+
+var options = {mode: 'wast', lineNumbers: true};
+var editor = CodeMirror.fromTextArea(editorEl, options);
+
+function debounce(f, wait) {
+  var lastTime = 0;
+  var timeoutId = -1;
+  var wrapped = function() {
+    var time = +new Date();
+    if (time - lastTime < wait) {
+      if (timeoutId == -1)
+        timeoutId = setTimeout(wrapped, (lastTime + wait) - time);
+      return;
+    }
+    if (timeoutId != -1)
+      clearTimeout(timeoutId);
+    timeoutId = -1;
+    lastTime = time;
+    f.apply(null, arguments);
+  };
+  return wrapped;
+}
+
+function compile(text) {
+  wabt.ready.then(function() {
+    outputEl.textContent = '';
+    try {
+      var script = wabt.parseWast('test.wast', text);
+      script.resolveNames();
+      script.validate();
+      var binaryOutput = script.toBinary({log: true});
+      outputEl.textContent = binaryOutput.log;
+      binaryBuffer = binaryOutput.buffer;
+      var blob = new Blob([binaryOutput.buffer]);
+      if (binaryBlobUrl) {
+        URL.revokeObjectURL(binaryBlobUrl);
+      }
+      binaryBlobUrl = URL.createObjectURL(blob);
+      downloadLink.setAttribute('href', binaryBlobUrl);
+      downloadEl.classList.remove('disabled');
+    } catch (e) {
+      outputEl.textContent += e.toString();
+      downloadEl.classList.add('disabled');
+    } finally {
+      if (script) script.destroy();
+    }
+  });
+}
+
+var compileInput =
+    debounce(function() { compile(editor.getValue()); }, kCompileMinMS);
+
+function onEditorChange(e) {
+  compileInput();
+}
+
+function setExample(index) {
+  var contents = examples[index].contents;
+  editor.setValue(contents);
+  compileInput();
+}
+
+function onSelectChanged(e) {
+  setExample(this.selectedIndex);
+}
+
+function onDownloadClicked(e) {
+  // See https://developer.mozilla.com/en-US/docs/Web/API/MouseEvent
+  var event = new MouseEvent('click', {
+    view: window,
+    bubbles: true,
+    cancelable: true,
+  });
+  downloadLink.dispatchEvent(event);
+}
+
+editor.on('change', onEditorChange);
+selectEl.addEventListener('change', onSelectChanged);
+downloadEl.addEventListener('click', onDownloadClicked);
+
+for (var i = 0; i < examples.length; ++i) {
+  var example = examples[i];
+  var option = document.createElement('option');
+  option.textContent = example.name;
+  selectEl.appendChild(option);
+}
+selectEl.selectedIndex = 1;
+setExample(selectEl.selectedIndex);