From dbf794c9849c0046cf2e93a878c6d8d9101d2fc8 Mon Sep 17 00:00:00 2001
From: RogueAI42 <declanhoare@exemail.com.au>
Date: Sat, 17 Jun 2017 19:16:50 +1000
Subject: MindBlow: Brainfuck IDE for ShiftOS

For 50,000 Codepoints you can write and run Brainfuck programs in
a dedicated IDE. Check out the site on "shiftnet/mindblow".

The IDE seems to be working perfectly. The site has some theming
issues.
---
 ShiftOS_TheReturn/BFInterpreter.cs      | 143 ++++++++++++++++++++++++++++++++
 ShiftOS_TheReturn/ShiftOS.Engine.csproj |   1 +
 2 files changed, 144 insertions(+)
 create mode 100644 ShiftOS_TheReturn/BFInterpreter.cs

(limited to 'ShiftOS_TheReturn')

diff --git a/ShiftOS_TheReturn/BFInterpreter.cs b/ShiftOS_TheReturn/BFInterpreter.cs
new file mode 100644
index 0000000..f2463a4
--- /dev/null
+++ b/ShiftOS_TheReturn/BFInterpreter.cs
@@ -0,0 +1,143 @@
+/*
+ * MIT License
+ * 
+ * Copyright (c) 2017 Michael VanOverbeek and ShiftOS devs
+ * 
+ * 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.
+ */
+
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ShiftOS.Engine
+{
+    /// <summary>
+    /// Receives events from the interpreter.
+    /// </summary>
+    public interface IBFListener
+    {
+        void PointerMoved(ushort newval);
+        void IPtrMoved(int newval);
+        void MemChanged(ushort pos, byte newval);
+        void MemReset();
+    }
+    /// <summary>
+    /// Interprets Brainfuck code.
+    /// </summary>
+    public class BFInterpreter
+    {
+        private byte[] mem;
+        private ushort ptr;
+        private string prg;
+        private object lck;
+        private Stream str;
+
+        public IBFListener lst = null;
+        
+        public BFInterpreter(Stream io, IBFListener listener = null, string program = "")
+        {
+            lck = new object();
+            prg = program;
+            str = io;
+            Reset();
+            lst = listener;
+        }
+        public void Execute()
+        {
+            lock (lck)
+                for (int iptr = 0; iptr < prg.Length; iptr++)
+                {
+                    if (lst != null)
+                        lst.IPtrMoved(iptr);
+                    switch (prg[iptr])
+                    {
+                        case '>':
+                            ptr++;
+                            if (lst != null)
+                                lst.PointerMoved(ptr);
+                            break;
+                        case '<':
+                            ptr--;
+                            if (lst != null)
+                                lst.PointerMoved(ptr);
+                            break;
+                        case '+':
+                            mem[ptr]++;
+                            if (lst != null)
+                                lst.MemChanged(ptr, mem[ptr]);
+                            break;
+                        case '-':
+                            mem[ptr]--;
+                            if (lst != null)
+                                lst.MemChanged(ptr, mem[ptr]);
+                            break;
+                        case '.':
+                            str.WriteByte(mem[ptr]);
+                            break;
+                        case ',':
+                            mem[ptr] = (byte)str.ReadByte();
+                            if (lst != null)
+                                lst.MemChanged(ptr, mem[ptr]);
+                            break;
+                        case '[':
+                            if (mem[ptr] == 0)
+                                while (prg[iptr] != ']')
+                                {
+                                    iptr++;
+                                    if (lst != null)
+                                        lst.IPtrMoved(iptr);
+                                }
+                            break;
+                        case ']':
+                            if (mem[ptr] != 0)
+                                while (prg[iptr] != '[')
+                                {
+                                    iptr--;
+                                    if (lst != null)
+                                        lst.IPtrMoved(iptr);
+                                }
+                            break;
+                    }
+                }
+        }
+        public void Execute(string program)
+        {
+            lock (lck)
+                prg = program;
+            Execute();
+        }
+        public void Reset()
+        {
+            lock (lck)
+            {
+                mem = new byte[30000];
+                ptr = 0;
+                if (lst != null)
+                {
+                    lst.MemReset();
+                    lst.PointerMoved(0);
+                }
+            }
+        }
+    }
+}
diff --git a/ShiftOS_TheReturn/ShiftOS.Engine.csproj b/ShiftOS_TheReturn/ShiftOS.Engine.csproj
index 9c9ad0f..5d434fc 100644
--- a/ShiftOS_TheReturn/ShiftOS.Engine.csproj
+++ b/ShiftOS_TheReturn/ShiftOS.Engine.csproj
@@ -122,6 +122,7 @@
     <Compile Include="AppearanceManager.cs" />
     <Compile Include="AppLauncherDaemon.cs" />
     <Compile Include="AudioManager.cs" />
+    <Compile Include="BFInterpreter.cs" />
     <Compile Include="CommandParser.cs" />
     <Compile Include="Commands.cs" />
     <Compile Include="Command.cs" />
-- 
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