From d47f76d4a6aabc303286104faacaea63466f118c Mon Sep 17 00:00:00 2001
From: Devin Jean <emailcruzjean@yahoo.com>
Date: Wed, 26 Jun 2024 11:44:16 -0500
Subject: [PATCH] basic state machines (#72)

---
 extensions/StateMachine/extension.json |  4 +++
 extensions/StateMachine/index.js       | 47 ++++++++++++++++++++++++++
 2 files changed, 51 insertions(+)
 create mode 100644 extensions/StateMachine/extension.json
 create mode 100644 extensions/StateMachine/index.js

diff --git a/extensions/StateMachine/extension.json b/extensions/StateMachine/extension.json
new file mode 100644
index 0000000..94246f2
--- /dev/null
+++ b/extensions/StateMachine/extension.json
@@ -0,0 +1,4 @@
+{
+    "description": "create and visualize state machines",
+    "useDev": false
+}
diff --git a/extensions/StateMachine/index.js b/extensions/StateMachine/index.js
new file mode 100644
index 0000000..df8c85c
--- /dev/null
+++ b/extensions/StateMachine/index.js
@@ -0,0 +1,47 @@
+(function () {
+    class StateMachine extends Extension {
+        constructor(ide) {
+            super('StateMachine');
+        }
+
+        getMenu() {
+            return {
+                'visualize': function () {
+                    alert('Coming Soon!');
+                },
+            };
+        }
+
+        getCategories() {
+            return [
+                new Extension.Category('StateMachine', new Color(150, 150, 150)),
+            ];
+        }
+
+        getPalette() {
+            const blocks = [
+                new Extension.Palette.Block('smTransition'),
+                new Extension.Palette.Block('smInState'),
+            ];
+            return [
+                new Extension.PaletteCategory('StateMachine', blocks, SpriteMorph),
+                new Extension.PaletteCategory('StateMachine', blocks, StageMorph),
+            ];
+        }
+
+        getBlocks() {
+            return [
+                new Extension.Block('smTransition', 'command', 'StateMachine', 'transition %var to %s', [], function (machine, state) {
+                    this.doSetVar(machine, state);
+                    this.doStop();
+                }).terminal().for(SpriteMorph, StageMorph),
+                new Extension.Block('smInState', 'predicate', 'StateMachine', '%var in state %s ?', [], function (machine, state) {
+                    const variables = this.context.variables;
+                    return variables.getVar(machine) == state;
+                }).for(SpriteMorph, StageMorph),
+            ];
+        }
+    }
+
+    NetsBloxExtensions.register(StateMachine);
+})();