implemented Stack (#10)

HelloWorld.java

@@ -1,14 +0,0 @@
-import commands.Command;
-import decoder.CommandDecoder;
-
-import java.util.ArrayList;
-
-class HelloWorld {
-    public static void main(String[] args) {
-        //System.out.println(Parser.Parser.parser("TPicSim2.LST"));
-        ArrayList<Command> program = new ArrayList<>();
-        int input1 = 0x3EFF;
-        program.add(CommandDecoder.decode(input1));
-        program.get(0).execute();
-    }
-}

de/darkress/pic16f84sim/Main.java

@@ -0,0 +1,33 @@
+package de.darkress.pic16f84sim;
+
+import de.darkress.pic16f84sim.commands.Command;
+import de.darkress.pic16f84sim.decoder.CommandDecoder;
+import de.darkress.pic16f84sim.registers.Memory;
+import de.darkress.pic16f84sim.registers.Stack;
+
+import java.util.ArrayList;
+
+class Main
+{
+    public static void main(String[] args) {
+        /*
+        ArrayList<Command> program = new ArrayList<>();
+        int input1 = 0x3EFF;
+        program.add(CommandDecoder.decode(input1));
+        program.get(0).execute();
+         */
+
+        for(int i = 0; i < 8; i++)
+        {
+            Stack.push(i);
+        }
+
+        for(int i = 0; i < 16; i++)
+        {
+            System.out.println(Stack.peek());
+            Stack.pop();
+        }
+
+
+    }
+}

de/darkress/pic16f84sim/commands/Addlw.java

@@ -1,6 +1,6 @@
-package commands;
+package de.darkress.pic16f84sim.commands;
 
-import registers.Memory;
+import de.darkress.pic16f84sim.registers.Memory;
 
 public class Addlw extends CommandUtils implements Command
 {

de/darkress/pic16f84sim/commands/Andlw.java

@@ -1,6 +1,6 @@
-package commands;
+package de.darkress.pic16f84sim.commands;
 
-import registers.Memory;
+import de.darkress.pic16f84sim.registers.Memory;
 
 public class Andlw extends CommandUtils implements Command
 {

de/darkress/pic16f84sim/commands/Command.java

@@ -1,4 +1,4 @@
-package commands;
+package de.darkress.pic16f84sim.commands;
 
 public interface Command
 {

de/darkress/pic16f84sim/commands/CommandUtils.java

@@ -1,6 +1,6 @@
-package commands;
+package de.darkress.pic16f84sim.commands;
 
-import registers.Memory;
+import de.darkress.pic16f84sim.registers.Memory;
 
 public class CommandUtils
 {

de/darkress/pic16f84sim/commands/Iorlw.java

@@ -1,6 +1,6 @@
-package commands;
+package de.darkress.pic16f84sim.commands;
 
-import registers.Memory;
+import de.darkress.pic16f84sim.registers.Memory;
 
 public class Iorlw extends CommandUtils implements Command
 {

de/darkress/pic16f84sim/commands/Movlw.java

@@ -1,6 +1,6 @@
-package commands;
+package de.darkress.pic16f84sim.commands;
 
-import registers.Memory;
+import de.darkress.pic16f84sim.registers.Memory;
 
 public class Movlw extends CommandUtils implements Command
 {

de/darkress/pic16f84sim/commands/Sublw.java

@@ -1,6 +1,6 @@
-package commands;
+package de.darkress.pic16f84sim.commands;
 
-import registers.Memory;
+import de.darkress.pic16f84sim.registers.Memory;
 
 public class Sublw extends CommandUtils implements Command
 {

de/darkress/pic16f84sim/decoder/CommandDecoder.java

@@ -1,6 +1,6 @@
-package decoder;
+package de.darkress.pic16f84sim.decoder;
 
-import commands.*;
+import de.darkress.pic16f84sim.commands.*;
 
 public class CommandDecoder
 {

de/darkress/pic16f84sim/parser/Parser.java

@@ -1,4 +1,4 @@
-package parser;
+package de.darkress.pic16f84sim.parser;
 
 import java.io.File;
 import java.io.FileNotFoundException;

de/darkress/pic16f84sim/registers/Memory.java

@@ -1,4 +1,4 @@
-package registers;
+package de.darkress.pic16f84sim.registers;
 
 import java.util.Arrays;
 
@@ -12,7 +12,7 @@ public class Memory
 
     public static int getRegister(int address)
     {
-        if(address + 128 > 255) //Guard statement to check for early errors in command decoder or implementation
+        if(address + 128 > 255) //Guard statement to check for early errors in command de.darkress.pic16f84sim.decoder or implementation
         {
             System.err.println("Guard statement triggered. The address must be 7Bit long and can therefore not exceed" +
                     " 127");
@@ -35,7 +35,7 @@ public class Memory
 
     public static void setRegister(int address, int data)
     {
-        if(address + 128 > 255) //Guard statement to check for early errors in command decoder or implementation
+        if(address + 128 > 255) //Guard statement to check for early errors in command de.darkress.pic16f84sim.decoder or implementation
         {
             System.err.println("Guard statement triggered. The address must be 7Bit long and can therefore not exceed" +
                     " 127");

de/darkress/pic16f84sim/registers/Stack.java

@@ -0,0 +1,51 @@
+package de.darkress.pic16f84sim.registers;
+
+
+public class Stack
+{
+    private static int[] stack = new int[8];
+    private static int stackPointer = 0;
+
+    public static void push(int data)
+    {
+        stack[stackPointer] = data;
+        pointNext();
+    }
+
+    public static int pop()
+    {
+        int tmp = stack[stackPointer];
+        pointPrevious();
+        return tmp;
+    }
+
+    public static int peek()
+    {
+        return stack[(stackPointer + 7) % 8]; //Get TopOfStack -1 +8 = 7 and modulo 8 to avoid IndexOutOfBound
+    }
+
+    private static void pointNext()
+    {
+        if(stackPointer == 7)
+        {
+            stackPointer = 0;
+            return;
+        }
+        stackPointer++;
+    }
+
+    private static void pointPrevious()
+    {
+        if(stackPointer == 0)
+        {
+            stackPointer = 7;
+            return;
+        }
+        stackPointer--;
+    }
+
+    public static int getStackPointer()
+    {
+        return stackPointer;
+    }
+}