add live load and unload

README.md

@@ -5,10 +5,10 @@ Summer project for NWAPW.
 Created by Arthur Drobot, Danila Fedorin and Riley Jones.
 
 ## Project Description
-Abacus is a calculator built with extensibility and usability in mind. It provides a plugin interface, via Java, as Lua proves too difficult to link up to the Java core. The description of the internals of the project can be found on the wiki page.
+Abacus is a calculator built with extensibility and usability in mind. It provides a plugin interface, via Java, as Lua provides too difficult to link up to the Java core. The description of the internals of the project can be found on the wiki page.
 
 ## Current State
-Abacus is being built for the Northwest Advanced Programming Workshop, a 3 week program in which students work in teams to complete a single project, following principles of agile development. Because of its short timeframe, Abacus is not even close to completed state. Below is a list of the current features and problems.
+Abacus is being built for the Northwest Advanced Programming Workshop, a 3 week program in which students work in treams to complete a single project, following principles of agile development. Because of its short timeframe, Abacus is not even close to completed state. Below is a list of the current features and problems.
 - [x] Basic number class
 - [x] Implementation of basic functions 
 - [x] Implementation of `exp`, `ln`, `sqrt` using the basic functions and Taylor Series

src/main/java/org/nwapw/abacus/Abacus.java

@@ -9,7 +9,7 @@ import org.nwapw.abacus.parsing.ShuntingYardParser;
 import org.nwapw.abacus.parsing.TreeBuilder;
 import org.nwapw.abacus.plugin.ClassFinder;
 import org.nwapw.abacus.plugin.PluginManager;
-import org.nwapw.abacus.plugin.StandardPlugin;
+//import org.nwapw.abacus.plugin.StandardPlugin;
 import org.nwapw.abacus.tree.NumberReducer;
 import org.nwapw.abacus.tree.TreeNode;
 
@@ -67,16 +67,22 @@ public class Abacus {
 
         pluginManager.addListener(lexerTokenizer);
         pluginManager.addListener(shuntingYardParser);
-        pluginManager.addInstantiated(new StandardPlugin(pluginManager));
+        //pluginManager.addInstantiated(new StandardPlugin(pluginManager));
+        /*
         try {
             ClassFinder.loadJars("plugins")
                     .forEach(plugin -> pluginManager.addClass(plugin));
         } catch (IOException | ClassNotFoundException e) {
             e.printStackTrace();
-        }
+        }//*/
         pluginManager.load();
     }
-
+    public void loadClass(Class<?> newClass){
+        pluginManager.addClass(newClass);
+    }
+    public void unloadClass(Class<?> newClass){
+        pluginManager.removeClass(newClass);
+    }
     public static void main(String[] args) {
         AbacusApplication.launch(AbacusApplication.class, args);
     }

src/main/java/org/nwapw/abacus/function/OperatorType.java

@@ -4,5 +4,5 @@ package org.nwapw.abacus.function;
  * The type of an operator, describing how it should behave.
  */
 public enum OperatorType {
-    BINARY_INFIX, UNARY_POSTFIX, UNARY_PREFIX
+    BINARY_INFIX, UNARY_POSTFIX
 }

src/main/java/org/nwapw/abacus/fx/AbacusController.java

@@ -1,6 +1,5 @@
 package org.nwapw.abacus.fx;
 
-import javafx.application.Platform;
 import javafx.collections.FXCollections;
 import javafx.collections.ObservableList;
 import javafx.fxml.FXML;
@@ -9,8 +8,11 @@ import javafx.scene.text.Text;
 import javafx.util.Callback;
 import org.nwapw.abacus.Abacus;
 import org.nwapw.abacus.number.NumberInterface;
+import org.nwapw.abacus.plugin.ClassFinder;
 import org.nwapw.abacus.tree.TreeNode;
 
+import java.io.IOException;
+
 
 /**
  * The controller for the abacus FX UI, responsible
@@ -26,10 +28,7 @@ public class AbacusController {
      * Constant string that is displayed if the tree could not be reduced.
      */
     private static final String ERR_EVAL = "Evaluation Error";
-    /**
-     * Constant string that is displayed if the calculations are stopped before they are done.
-     */
-    private static final String ERR_STOP = "Stopped";
+
     @FXML
     private TableView<HistoryModel> historyTable;
     @FXML
@@ -46,6 +45,12 @@ public class AbacusController {
     private Button inputButton;
     @FXML
     private ComboBox<String> numberImplementationBox;
+    @FXML
+    private Button loadButton;
+    @FXML
+    private Button unloadButton;
+    @FXML
+    private TextField loadField;
 
     /**
      * The list of history entries, created by the users.
@@ -58,20 +63,6 @@ public class AbacusController {
      */
     private ObservableList<String> numberImplementationOptions;
 
-    /**
-     * Thread used for calculating.
-     */
-    private Thread calcThread;
-
-    /**
-     * Checks whether the calculator is calculating.
-     */
-    private boolean calculating;
-
-    /**
-     * Seconds delayed for timer;
-     */
-    private double delay = 0;
     private Abacus abacus;
 
     @FXML
@@ -105,63 +96,57 @@ public class AbacusController {
 
     @FXML
     private void performCalculation(){
-        Runnable calculator = new Runnable(){
-            public void run() {
-                if(delay>0) {
-                    Runnable timer = new Runnable() {
-                        public void run() {
-                            long gap = (long) (delay * 1000);
-                            long startTime = System.currentTimeMillis();
-                            while (System.currentTimeMillis() - startTime <= gap) {
-                            }
-                            stopCalculation();
-                        }
-                    };
-                    Thread maxTime = new Thread(timer);
-                    maxTime.setName("maxTime");
-                    maxTime.start();
-                }
-                calculating = true;
-                Platform.runLater(() -> inputButton.setDisable(true));
-                TreeNode constructedTree = abacus.parseString(inputField.getText());
-                if (constructedTree == null) {
-                    Platform.runLater(() ->outputText.setText(ERR_SYNTAX));
-                    Platform.runLater(() -> inputButton.setDisable(false));
-                    //return;
-                }else {
-                    NumberInterface evaluatedNumber = abacus.evaluateTree(constructedTree);
-                    if (evaluatedNumber == null) {
-                        if(Thread.currentThread().isInterrupted()){
-                            Platform.runLater(() -> outputText.setText(ERR_STOP));
-                            Platform.runLater(() -> inputButton.setDisable(false));
-                        }else {
-                            Platform.runLater(() -> outputText.setText(ERR_EVAL));
-                            Platform.runLater(() -> inputButton.setDisable(false));
-                            //return;
-                        }
-                    } else {
-                        Platform.runLater(() -> outputText.setText(evaluatedNumber.toString()));
+        inputButton.setDisable(true);
+        TreeNode constructedTree = abacus.parseString(inputField.getText());
+        if(constructedTree == null){
+            outputText.setText(ERR_SYNTAX);
+            inputButton.setDisable(false);
+            return;
+        }
+        NumberInterface evaluatedNumber = abacus.evaluateTree(constructedTree);
+        if(evaluatedNumber == null){
+            outputText.setText(ERR_EVAL);
+            inputButton.setDisable(false);
+            return;
+        }
+        outputText.setText(evaluatedNumber.toString());
+        historyData.add(new HistoryModel(inputField.getText(), constructedTree.toString(), evaluatedNumber.toString()));
 
-                        historyData.add(new HistoryModel(inputField.getText(), constructedTree.toString(), evaluatedNumber.toString()));
-
-                        Platform.runLater(() -> inputButton.setDisable(false));
-                        Platform.runLater(() -> inputField.setText(""));
-                    }
+        inputButton.setDisable(false);
+        inputField.setText("");
+    }
+    @FXML
+    private void loadClass(){
+        try {
+            for(Class<?> plugin :ClassFinder.loadJars("plugins")){
+                String name = "";
+                //String name = plugin.getName();
+                while(!(name.indexOf('/') ==-1)){
+                    name=name.substring(name.indexOf('/')+1);
+                }
+                if(loadField.getText().equals("")||loadField.getText().equals(name)||(loadField.getText()+".class").equals(name)){
+                    //abacus.loadClass(plugin);
                 }
-                calculating = false;
             }
-        };
-        if(!calculating) {
-                calcThread = new Thread(calculator);
-                calcThread.setName("calcThread");
-                calcThread.start();
+        } catch (IOException | ClassNotFoundException e) {
+            e.printStackTrace();
         }
     }
     @FXML
-    private void stopCalculation(){
-        calcThread.interrupt();
-        calculating = false;
-        //Platform.runLater(() ->inputButton.setDisable(false));
+    private void unloadClass(){
+        try {
+            for(Class<?> plugin :ClassFinder.loadJars("plugins")){
+                String name = plugin.getName();
+                while(!(name.indexOf('/') ==-1)){
+                    name=name.substring(name.indexOf('/')+1);
+                }
+                if(loadField.getText().equals("")||loadField.getText().equals(name)||(loadField.getText()+".class").equals(name)){
+                    //abacus.unloadClass(plugin);
+                }
+            }
+        } catch (IOException | ClassNotFoundException e) {
+            e.printStackTrace();
+        }
     }
 
 }

src/main/java/org/nwapw/abacus/parsing/ShuntingYardParser.java

@@ -55,12 +55,9 @@ public class ShuntingYardParser implements Parser<Match<TokenType>>, PluginListe
     public List<Match<TokenType>> intoPostfix(List<Match<TokenType>> from) {
         ArrayList<Match<TokenType>> output = new ArrayList<>();
         Stack<Match<TokenType>> tokenStack = new Stack<>();
-        TokenType previousType;
-        TokenType matchType = null;
         while (!from.isEmpty()) {
             Match<TokenType> match = from.remove(0);
-            previousType = matchType;
-            matchType = match.getType();
+            TokenType matchType = match.getType();
             if (matchType == TokenType.NUM) {
                 output.add(match);
             } else if (matchType == TokenType.FUNCTION) {
@@ -77,13 +74,7 @@ public class ShuntingYardParser implements Parser<Match<TokenType>>, PluginListe
                     continue;
                 }
 
-                if(tokenString.equals("-") && (previousType == null || previousType == TokenType.OP ||
-                        previousType == TokenType.OPEN_PARENTH)){
-                    from.add(0, new Match<>("`", TokenType.OP));
-                    continue;
-                }
-
-                while (!tokenStack.empty() && type == OperatorType.BINARY_INFIX) {
+                while (!tokenStack.empty()) {
                     Match<TokenType> otherMatch = tokenStack.peek();
                     TokenType otherMatchType = otherMatch.getType();
                     if (!(otherMatchType == TokenType.OP || otherMatchType == TokenType.FUNCTION)) break;
@@ -112,8 +103,8 @@ public class ShuntingYardParser implements Parser<Match<TokenType>>, PluginListe
         }
         while (!tokenStack.empty()) {
             Match<TokenType> match = tokenStack.peek();
-            TokenType newMatchType = match.getType();
-            if (!(newMatchType == TokenType.OP || newMatchType == TokenType.FUNCTION)) return null;
+            TokenType matchType = match.getType();
+            if (!(matchType == TokenType.OP || matchType == TokenType.FUNCTION)) return null;
             output.add(tokenStack.pop());
         }
         return output;
@@ -136,11 +127,11 @@ public class ShuntingYardParser implements Parser<Match<TokenType>>, PluginListe
                 TreeNode right = constructRecursive(matches);
                 TreeNode left = constructRecursive(matches);
                 if (left == null || right == null) return null;
-                else return new BinaryNode(operator, left, right);
+                else return new BinaryInfixNode(operator, left, right);
             } else {
                 TreeNode applyTo = constructRecursive(matches);
                 if (applyTo == null) return null;
-                else return new UnaryNode(operator, applyTo);
+                else return new UnaryPrefixNode(operator, applyTo);
             }
         } else if (matchType == TokenType.NUM) {
             return new NumberNode(abacus.numberFromString(match.getContent()));

src/main/java/org/nwapw/abacus/plugin/PluginManager.java

@@ -140,6 +140,11 @@ public class PluginManager {
         plugins.add(plugin);
         loadedPluginClasses.add(plugin.getClass());
     }
+    public void removeInstantiated(Plugin plugin){
+        if (loadedPluginClasses.contains(plugin.getClass())) return;
+        plugins.remove(plugin);
+        loadedPluginClasses.remove(plugin.getClass());
+    }
 
     /**
      * Instantiates a class of plugin, and adds it to this
@@ -155,6 +160,14 @@ public class PluginManager {
             e.printStackTrace();
         }
     }
+    public void removeClass(Class<?> newClass){
+        if (!Plugin.class.isAssignableFrom(newClass) || newClass == Plugin.class) return;
+        try {
+            removeInstantiated((Plugin) newClass.getConstructor(PluginManager.class).newInstance(this));
+        } catch (InstantiationException | IllegalAccessException | NoSuchMethodException | InvocationTargetException e) {
+            e.printStackTrace();
+        }
+    }
 
     /**
      * Loads all the plugins in the PluginManager.

src/main/java/org/nwapw/abacus/plugin/StandardPlugin.java

@@ -31,13 +31,9 @@ public class StandardPlugin extends Plugin {
 
         @Override
         protected NumberInterface applyInternal(NumberInterface[] params) {
-            if(Thread.currentThread().isInterrupted())
-                return null;
             NumberInterface sum = params[0];
             for (int i = 1; i < params.length; i++) {
                 sum = sum.add(params[i]);
-                if(Thread.currentThread().isInterrupted())
-                    return null;
             }
             return sum;
         }
@@ -53,26 +49,7 @@ public class StandardPlugin extends Plugin {
 
         @Override
         protected NumberInterface applyInternal(NumberInterface[] params) {
-            if(Thread.currentThread().isInterrupted())
-                return null;
             return params[0].subtract(params[1]);
-
-        }
-    });
-    /**
-     * The negation operator, -
-     */
-    public static final Operator OP_NEGATE = new Operator(OperatorAssociativity.LEFT, OperatorType.UNARY_PREFIX, 0, new Function() {
-        @Override
-        protected boolean matchesParams(NumberInterface[] params) {
-            return params.length == 1;
-        }
-
-        @Override
-        protected NumberInterface applyInternal(NumberInterface[] params) {
-            if(Thread.currentThread().isInterrupted())
-                return null;
-            return params[0].negate();
         }
     });
     /**
@@ -86,13 +63,9 @@ public class StandardPlugin extends Plugin {
 
         @Override
         protected NumberInterface applyInternal(NumberInterface[] params) {
-            if(Thread.currentThread().isInterrupted())
-                return null;
             NumberInterface product = params[0];
             for (int i = 1; i < params.length; i++) {
                 product = product.multiply(params[i]);
-                if(Thread.currentThread().isInterrupted())
-                    return null;
             }
             return product;
         }
@@ -103,14 +76,16 @@ public class StandardPlugin extends Plugin {
     public static final Operator OP_DIVIDE = new Operator(OperatorAssociativity.LEFT, OperatorType.BINARY_INFIX, 1, new Function() {
         @Override
         protected boolean matchesParams(NumberInterface[] params) {
-            return params.length == 2;
+            return params.length >= 1;
         }
 
         @Override
         protected NumberInterface applyInternal(NumberInterface[] params) {
-            if(Thread.currentThread().isInterrupted())
-                return null;
-            return params[0].divide(params[1]);
+            NumberInterface product = params[0];
+            for (int i = 1; i < params.length; i++) {
+                product = product.multiply(params[i]);
+            }
+            return product;
         }
     });
     /**
@@ -125,19 +100,15 @@ public class StandardPlugin extends Plugin {
 
         @Override
         protected NumberInterface applyInternal(NumberInterface[] params) {
-            if(Thread.currentThread().isInterrupted())
-                return null;
             if (params[0].signum() == 0) {
                 return (new NaiveNumber(1)).promoteTo(params[0].getClass());
             }
             NumberInterface factorial = params[0];
             NumberInterface multiplier = params[0];
             //It is necessary to later prevent calls of factorial on anything but non-negative integers.
-            while (!Thread.currentThread().isInterrupted()&&(multiplier = multiplier.subtract(NaiveNumber.ONE.promoteTo(multiplier.getClass())))!=null&&multiplier.signum() == 1) {
+            while ((multiplier = multiplier.subtract(NaiveNumber.ONE.promoteTo(multiplier.getClass()))).signum() == 1) {
                 factorial = factorial.multiply(multiplier);
             }
-            if(Thread.currentThread().isInterrupted())
-                return null;
             return factorial;
                 /*if(!storedList.containsKey(params[0].getClass())){
                     storedList.put(params[0].getClass(), new ArrayList<NumberInterface>());
@@ -157,12 +128,7 @@ public class StandardPlugin extends Plugin {
 
         @Override
         protected NumberInterface applyInternal(NumberInterface[] params) {
-            if(Thread.currentThread().isInterrupted())
-                return null;
-            NumberInterface check;
-            if((check = FUNCTION_EXP.apply(FUNCTION_LN.apply(params[0])))!=null&&(check = check.multiply(params[1]))!=null)
-                return check;
-            return null;
+            return FUNCTION_EXP.apply(FUNCTION_LN.apply(params[0]).multiply(params[1]));
         }
     });
     /**
@@ -176,8 +142,6 @@ public class StandardPlugin extends Plugin {
 
         @Override
         protected NumberInterface applyInternal(NumberInterface[] params) {
-            if(Thread.currentThread().isInterrupted())
-                return null;
             return params[0].multiply((new NaiveNumber(params[0].signum())).promoteTo(params[0].getClass()));
         }
     };
@@ -192,17 +156,14 @@ public class StandardPlugin extends Plugin {
 
         @Override
         protected NumberInterface applyInternal(NumberInterface[] params) {
-            if(Thread.currentThread().isInterrupted())
-                return null;
             NumberInterface maxError = getMaxError(params[0]);
             int n = 0;
             if(params[0].signum() <= 0){
                 NumberInterface currentTerm = NaiveNumber.ONE.promoteTo(params[0].getClass()), sum = currentTerm;
-                NumberInterface check;
-                while((check = FUNCTION_ABS.apply(currentTerm))!=null && (check.compareTo(maxError) > 0)){
+                while(FUNCTION_ABS.apply(currentTerm).compareTo(maxError) > 0){
                     n++;
-                    if(Thread.currentThread().isInterrupted()||(currentTerm = currentTerm.multiply(params[0]))==null||(currentTerm = currentTerm.divide((new NaiveNumber(n)).promoteTo(params[0].getClass())))==null||(sum = (sum.add(currentTerm)))==null)
-                        return null;
+                    currentTerm = currentTerm.multiply(params[0]).divide((new NaiveNumber(n)).promoteTo(params[0].getClass()));
+                    sum = sum.add(currentTerm);
                 }
                 return sum;
             }
@@ -211,28 +172,18 @@ public class StandardPlugin extends Plugin {
                 //right and left refer to lhs and rhs in the above inequality.
                 NumberInterface sum = NaiveNumber.ONE.promoteTo(params[0].getClass());
                 NumberInterface nextNumerator = params[0];
-                //NumberInterface left = params[0].multiply((new NaiveNumber(3)).promoteTo(params[0].getClass()).intPow(params[0].ceiling())), right = maxError;
-                NumberInterface check;
-                        if((check =intPow(new NaiveNumber(3).promoteTo(params[0].getClass()),params[0].getClass(),(new NaiveNumber(params[0].ceiling())).promoteTo(params[0].getClass())))==null)
-                            return null;
-                        NumberInterface left = params[0].multiply(check), right = maxError;
+                NumberInterface left = params[0].multiply((new NaiveNumber(3)).promoteTo(params[0].getClass()).intPow(params[0].ceiling())), right = maxError;
                 do{
-                    if((check = factorial(params[0].getClass(),n+1))==null||(check = nextNumerator.divide(check))==null||(sum = sum.add(check))==null)
-                        return null;
+                    sum = sum.add(nextNumerator.divide(factorial(params[0].getClass(), n+1)));
                     n++;
-                    if((nextNumerator = nextNumerator.multiply(params[0]))==null)
-                        return null;
-                    if((left = left.multiply(params[0]))==null)
-                        return null;
+                    nextNumerator = nextNumerator.multiply(params[0]);
+                    left = left.multiply(params[0]);
                     NumberInterface nextN = (new NaiveNumber(n+1)).promoteTo(params[0].getClass());
-                    if((right = right.multiply(nextN))==null)
-                        return null;
+                    right = right.multiply(nextN);
                     //System.out.println(left + ", " + right);
                 }
-                while(!Thread.currentThread().isInterrupted()&&left.compareTo(right) > 0);
+                while(left.compareTo(right) > 0);
                 //System.out.println(n+1);
-               if(Thread.currentThread().isInterrupted())
-                    return null;
                 return sum;
             }
         }
@@ -248,32 +199,26 @@ public class StandardPlugin extends Plugin {
 
         @Override
         protected NumberInterface applyInternal(NumberInterface[] params) {
-            if(Thread.currentThread().isInterrupted())
-                return null;
             NumberInterface param = params[0];
             int powersOf2 = 0;
-            NumberInterface check;
-            while (!Thread.currentThread().isInterrupted()&&(check = FUNCTION_ABS.apply(param.subtract(NaiveNumber.ONE.promoteTo(param.getClass()))))!=null&&(check.compareTo((new NaiveNumber(0.1)).promoteTo(param.getClass()))) >= 0) {
-                if ((check = param.subtract(NaiveNumber.ONE.promoteTo(param.getClass())))!=null&&check.signum() == 1) {
+            while (FUNCTION_ABS.apply(param.subtract(NaiveNumber.ONE.promoteTo(param.getClass()))).compareTo((new NaiveNumber(0.1)).promoteTo(param.getClass())) >= 0) {
+                if (param.subtract(NaiveNumber.ONE.promoteTo(param.getClass())).signum() == 1) {
                     param = param.divide(new NaiveNumber(2).promoteTo(param.getClass()));
                     powersOf2++;
-                    if ((check = param.subtract(NaiveNumber.ONE.promoteTo(param.getClass())))==null||check.signum() != 1) {
+                    if (param.subtract(NaiveNumber.ONE.promoteTo(param.getClass())).signum() != 1) {
                         break;
                         //No infinite loop for you.
                     }
                 } else {
                     param = param.multiply(new NaiveNumber(2).promoteTo(param.getClass()));
                     powersOf2--;
-                    if ((check = param.subtract(NaiveNumber.ONE.promoteTo(param.getClass())))==null||check.signum() != 1) {
+                    if (param.subtract(NaiveNumber.ONE.promoteTo(param.getClass())).signum() != 1) {
                         break;
                         //No infinite loop for you.
                     }
                 }
             }
-            NumberInterface check2;
-            if(!Thread.currentThread().isInterrupted()&&(check = getLog2(param))!=null&&(check = check.multiply((new NaiveNumber(powersOf2).promoteTo(param.getClass()))))!=null&&(check2 = getLogPartialSum(param))!=null&&(check = check.add(check2))!=null)
-                   return check;
-            return null;
+            return getLog2(param).multiply((new NaiveNumber(powersOf2)).promoteTo(param.getClass())).add(getLogPartialSum(param));
         }
 
         /**
@@ -283,23 +228,16 @@ public class StandardPlugin extends Plugin {
          * @return the partial sum.
          */
         private NumberInterface getLogPartialSum(NumberInterface x) {
-
-            if(Thread.currentThread().isInterrupted())
-                return null;
             NumberInterface maxError = getMaxError(x);
             x = x.subtract(NaiveNumber.ONE.promoteTo(x.getClass())); //Terms used are for log(x+1).
             NumberInterface currentNumerator = x, currentTerm = x, sum = x;
             int n = 1;
-            NumberInterface check;
-            while (!Thread.currentThread().isInterrupted()&&(check = FUNCTION_ABS.apply(currentTerm))!=null&&check.compareTo(maxError) > 0) {
+            while (FUNCTION_ABS.apply(currentTerm).compareTo(maxError) > 0) {
                 n++;
-                if((currentNumerator = currentNumerator.multiply(x))==null||(currentNumerator = currentNumerator.negate())==null)
-                    return null;
+                currentNumerator = currentNumerator.multiply(x).negate();
                 currentTerm = currentNumerator.divide(new NaiveNumber(n).promoteTo(x.getClass()));
                 sum = sum.add(currentTerm);
             }
-            if(Thread.currentThread().isInterrupted())
-                return null;
             return sum;
         }
 
@@ -309,8 +247,6 @@ public class StandardPlugin extends Plugin {
          * @return the value of log(2) with the appropriate precision.
          */
         private NumberInterface getLog2(NumberInterface number) {
-            if(Thread.currentThread().isInterrupted())
-                return null;
             NumberInterface maxError = getMaxError(number);
             //NumberInterface errorBound = (new NaiveNumber(1)).promoteTo(number.getClass());
             //We'll use the series \sigma_{n >= 1) ((1/3^n + 1/4^n) * 1/n)
@@ -319,17 +255,13 @@ public class StandardPlugin extends Plugin {
             NumberInterface a = (new NaiveNumber(1)).promoteTo(number.getClass()), b = a, c = a;
             NumberInterface sum = NaiveNumber.ZERO.promoteTo(number.getClass());
             int n = 0;
-            while (!Thread.currentThread().isInterrupted()&&a.compareTo(maxError) >= 1) {
+            while (a.compareTo(maxError) >= 1) {
                 n++;
                 a = a.divide((new NaiveNumber(3)).promoteTo(number.getClass()));
                 b = b.divide((new NaiveNumber(4)).promoteTo(number.getClass()));
                 c = NaiveNumber.ONE.promoteTo(number.getClass()).divide((new NaiveNumber(n)).promoteTo(number.getClass()));
-                NumberInterface check;
-                if(a==null||(check = a.add(b))==null||(check = check.multiply(c))==null||(sum = sum.add(check))==null)
-                    return null;
+                sum = sum.add(a.add(b).multiply(c));
             }
-            if(Thread.currentThread().isInterrupted())
-                return null;
             return sum;
         }
     };
@@ -385,7 +317,6 @@ public class StandardPlugin extends Plugin {
 
         registerOperator("+", OP_ADD);
         registerOperator("-", OP_SUBTRACT);
-        registerOperator("`", OP_NEGATE);
         registerOperator("*", OP_MULTIPLY);
         registerOperator("/", OP_DIVIDE);
         registerOperator("^", OP_CARET);
@@ -403,43 +334,18 @@ public class StandardPlugin extends Plugin {
     }
 
     public static NumberInterface factorial(Class<? extends NumberInterface> numberClass, int n){
-        if(Thread.currentThread().isInterrupted())
-            return null;
         if(!factorialLists.containsKey(numberClass)){
-            factorialLists.put(numberClass, new ArrayList<>());
+            factorialLists.put(numberClass, new ArrayList<NumberInterface>());
             factorialLists.get(numberClass).add(NaiveNumber.ONE.promoteTo(numberClass));
             factorialLists.get(numberClass).add(NaiveNumber.ONE.promoteTo(numberClass));
         }
         ArrayList<NumberInterface> list = factorialLists.get(numberClass);
         if(n >= list.size()){
-            while(!Thread.currentThread().isInterrupted()&&list.size() < n + 16){
+            while(list.size() < n + 16){
                 list.add(list.get(list.size()-1).multiply(new NaiveNumber(list.size()).promoteTo(numberClass)));
             }
         }
-        if(Thread.currentThread().isInterrupted())
-            return null;
         return list.get(n);
     }
-    public static NumberInterface intPow(NumberInterface number, Class<? extends NumberInterface> numberClass,NumberInterface exponent) {
-        if(Thread.currentThread().isInterrupted())
-            return null;
-        if (exponent.compareTo((new NaiveNumber(0)).promoteTo(numberClass))==0) {
-            return (new NaiveNumber(1)).promoteTo(numberClass);
-        }
-        boolean takeReciprocal = exponent.compareTo((new NaiveNumber(0)).promoteTo(numberClass))<0;
-        exponent = FUNCTION_ABS.apply(exponent);
-        NumberInterface power = number;
-        for(NumberInterface currentExponent =(new NaiveNumber(1)).promoteTo(numberClass);currentExponent.compareTo(exponent)<0;currentExponent = currentExponent.add((new NaiveNumber(1)).promoteTo(numberClass))){
-            power = power.multiply(number);
-            if(Thread.currentThread().isInterrupted())
-                return null;
-        }
-        if (takeReciprocal) {
-            power = (new NaiveNumber(1)).promoteTo(numberClass).divide(power);
-        }
-        if(Thread.currentThread().isInterrupted())
-            return null;
-        return power;
-    }
 
 }

src/main/java/org/nwapw/abacus/tree/BinaryInfixNode.java

@@ -3,7 +3,7 @@ package org.nwapw.abacus.tree;
 /**
  * A tree node that represents an operation being applied to two operands.
  */
-public class BinaryNode extends TreeNode {
+public class BinaryInfixNode extends TreeNode {
 
     /**
      * The operation being applied.
@@ -18,7 +18,7 @@ public class BinaryNode extends TreeNode {
      */
     private TreeNode right;
 
-    private BinaryNode() {
+    private BinaryInfixNode() {
     }
 
     /**
@@ -27,7 +27,7 @@ public class BinaryNode extends TreeNode {
      *
      * @param operation the operation.
      */
-    public BinaryNode(String operation) {
+    public BinaryInfixNode(String operation) {
         this(operation, null, null);
     }
 
@@ -39,7 +39,7 @@ public class BinaryNode extends TreeNode {
      * @param left      the left node of the expression.
      * @param right     the right node of the expression.
      */
-    public BinaryNode(String operation, TreeNode left, TreeNode right) {
+    public BinaryInfixNode(String operation, TreeNode left, TreeNode right) {
         this.operation = operation;
         this.left = left;
         this.right = right;
@@ -92,15 +92,10 @@ public class BinaryNode extends TreeNode {
 
     @Override
     public <T> T reduce(Reducer<T> reducer) {
-        if(Thread.currentThread().isInterrupted())
-            return null;
         T leftReduce = left.reduce(reducer);
         T rightReduce = right.reduce(reducer);
         if (leftReduce == null || rightReduce == null) return null;
-        T a = reducer.reduceNode(this, leftReduce, rightReduce);
-        if(Thread.currentThread().isInterrupted())
-            return null;
-        return a;
+        return reducer.reduceNode(this, leftReduce, rightReduce);
     }
 
     @Override

src/main/java/org/nwapw/abacus/tree/FunctionNode.java

@@ -62,17 +62,12 @@ public class FunctionNode extends TreeNode {
 
     @Override
     public <T> T reduce(Reducer<T> reducer) {
-        if(Thread.currentThread().isInterrupted())
-            return null;
         Object[] reducedChildren = new Object[children.size()];
         for (int i = 0; i < reducedChildren.length; i++) {
             reducedChildren[i] = children.get(i).reduce(reducer);
-            if (Thread.currentThread().isInterrupted()||reducedChildren[i] == null) return null;
+            if (reducedChildren[i] == null) return null;
         }
-        T a = reducer.reduceNode(this, reducedChildren);
-        if(Thread.currentThread().isInterrupted())
-            return null;
-        return a;
+        return reducer.reduceNode(this, reducedChildren);
     }
 
     @Override

src/main/java/org/nwapw/abacus/tree/NumberReducer.java

@@ -28,15 +28,15 @@ public class NumberReducer implements Reducer<NumberInterface> {
     public NumberInterface reduceNode(TreeNode node, Object... children) {
         if (node instanceof NumberNode) {
             return ((NumberNode) node).getNumber();
-        } else if (node instanceof BinaryNode) {
+        } else if (node instanceof BinaryInfixNode) {
             NumberInterface left = (NumberInterface) children[0];
             NumberInterface right = (NumberInterface) children[1];
-            Function function = abacus.getPluginManager().operatorFor(((BinaryNode) node).getOperation()).getFunction();
+            Function function = abacus.getPluginManager().operatorFor(((BinaryInfixNode) node).getOperation()).getFunction();
             if (function == null) return null;
             return function.apply(left, right);
-        } else if (node instanceof UnaryNode) {
+        } else if (node instanceof UnaryPrefixNode) {
             NumberInterface child = (NumberInterface) children[0];
-            Function functionn = abacus.getPluginManager().operatorFor(((UnaryNode) node).getOperation()).getFunction();
+            Function functionn = abacus.getPluginManager().operatorFor(((UnaryPrefixNode) node).getOperation()).getFunction();
             if (functionn == null) return null;
             return functionn.apply(child);
         } else if (node instanceof FunctionNode) {

src/main/java/org/nwapw/abacus/tree/UnaryPrefixNode.java

@@ -1,6 +1,6 @@
 package org.nwapw.abacus.tree;
 
-public class UnaryNode extends TreeNode {
+public class UnaryPrefixNode extends TreeNode {
 
     /**
      * The operation this node will apply.
@@ -16,7 +16,7 @@ public class UnaryNode extends TreeNode {
      *
      * @param operation the operation for this node.
      */
-    public UnaryNode(String operation) {
+    public UnaryPrefixNode(String operation) {
         this(operation, null);
     }
 
@@ -26,21 +26,16 @@ public class UnaryNode extends TreeNode {
      * @param operation the operation for this node.
      * @param applyTo   the node to apply the function to.
      */
-    public UnaryNode(String operation, TreeNode applyTo) {
+    public UnaryPrefixNode(String operation, TreeNode applyTo) {
         this.operation = operation;
         this.applyTo = applyTo;
     }
 
     @Override
     public <T> T reduce(Reducer<T> reducer) {
-        if(Thread.currentThread().isInterrupted())
-            return null;
         Object reducedChild = applyTo.reduce(reducer);
         if (reducedChild == null) return null;
-        T a = reducer.reduceNode(this, reducedChild);
-        if(Thread.currentThread().isInterrupted())
-            return null;
-        return a;
+        return reducer.reduceNode(this, reducedChild);
     }
 
     /**

src/main/resources/abacus.fxml

@@ -37,8 +37,6 @@
                             <TextField fx:id="inputField" onAction="#performCalculation"/>
                             <Button fx:id="inputButton" text="Calculate" maxWidth="Infinity"
                                     onAction="#performCalculation"/>
-                            <Button fx:id="stopButton" text="Stop" maxWidth="Infinity"
-                                    onAction="#stopCalculation"/>
                         </VBox>
                     </bottom>
                 </BorderPane>
@@ -48,6 +46,9 @@
                     <padding><Insets left="10" right="10" top="10" bottom="10"/></padding>
                     <Label text="Number Implementation" GridPane.columnIndex="0" GridPane.rowIndex="0"/>
                     <ComboBox fx:id="numberImplementationBox" GridPane.columnIndex="1" GridPane.rowIndex="0"/>
+                    <Button fx:id="loadButton" text="Load" GridPane.rowIndex="1" GridPane.columnIndex="0" maxWidth = "Infinity" onAction="#loadClass"/>
+                    <Button fx:id="unloadButton" text="Unload" GridPane.rowIndex="1" GridPane.columnIndex="1" maxWidth = "Infinity" onAction="#unloadClass"/>
+                    <TextField fx:id="loadField" GridPane.rowIndex="1" GridPane.columnIndex="2"/>
                 </GridPane>
             </Tab>
         </TabPane>