implemented Stack (#10)

de/darkress/pic16f84sim/decoder/CommandDecoder.java

@@ -0,0 +1,149 @@
+package de.darkress.pic16f84sim.decoder;
+
+import de.darkress.pic16f84sim.commands.*;
+
+public class CommandDecoder
+{
+    public static Command decode(int input)
+    {
+        switch(input & 0x3F00)
+        {
+            case 0x700:
+                //addwf();
+                break;
+            case 0x500:
+                //andwf();
+                break;
+            case 0x900:
+                //comf();
+                break;
+            case 0x300:
+                //decf();
+                break;
+            case 0xB00:
+                //decfsz();
+                break;
+            case 0xA00:
+                //incf();
+                break;
+            case 0xF00:
+                //incfsz();
+                break;
+            case 0x400:
+                //iorwf();
+                break;
+            case 0x800:
+                //movf();
+                break;
+            case 0xD00:
+                //rlf();
+                break;
+            case 0xC00:
+                //rrf();
+                break;
+            case 0x200:
+                //subwf();
+                break;
+            case 0xE00:
+                //swapf();
+                break;
+            case 0x600:
+                //xorwf();
+                break;
+            case 0x3900:
+                return new Andlw(input);
+            case 0x3800:
+                return new Iorlw(input);
+            case 0x3A00:
+                //xorlw();
+                break;
+        }
+
+        switch(input & 0x3F80)
+        {
+            case 0x180:
+                //clrf();
+                break;
+            case 0x100:
+                //clrw();
+                break;
+            case 0x80:
+                //movwf();
+                break;
+        }
+
+        switch(input & 0x3C00)
+        {
+            case 0x1000:
+                //bcf();
+                break;
+            case 0x1400:
+                //bsf();
+                break;
+            case 0x1800:
+                //btfsc();
+                break;
+            case 0x1C00:
+                //btfss();
+                break;
+        }
+
+        switch(input & 0x3E00)
+        {
+            case 0x3E00:
+                //addlw();
+                return new Addlw(input);
+                //break;
+            case 0x3C00:
+                return new Sublw(input);
+        }
+
+        switch(input & 0x3800)
+        {
+            case 0x2000:
+                //call();
+                break;
+            case 0x2800:
+                //goto();
+                break;
+        }
+
+        switch(input & 0x3C00)
+        {
+            case 0x3000:
+                return new Movlw(input);
+            case 0x3400:
+                //retlw();
+                break;
+        }
+
+        if ((input | 0x0060) == 0x0060)
+        {
+            //nop();
+        }
+
+        if (input == 0x0064)
+        {
+            //clrwdt();
+        }
+
+        if (input == 0x0009)
+        {
+            //retfie();
+        }
+
+        if (input == 0x0008)
+        {
+            //return();
+            //This is the function name. Do not mistake this for a normal return!
+        }
+
+        if (input == 0x0063)
+        {
+            //sleep();
+        }
+
+        System.out.println("No command matched");
+        return null;
+    }
+}