Fix exp function

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

@@ -1,5 +1,6 @@
 package org.nwapw.abacus.fx;
 
+import javafx.application.Platform;
 import javafx.collections.FXCollections;
 import javafx.collections.ObservableList;
 import javafx.fxml.FXML;
@@ -25,7 +26,10 @@ 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
@@ -54,6 +58,20 @@ 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
@@ -87,24 +105,63 @@ public class AbacusController {
 
     @FXML
     private void performCalculation(){
-        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()));
+        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(false);
-        inputField.setText("");
+                        historyData.add(new HistoryModel(inputField.getText(), constructedTree.toString(), evaluatedNumber.toString()));
+
+                        Platform.runLater(() -> inputButton.setDisable(false));
+                        Platform.runLater(() -> inputField.setText(""));
+                    }
+                }
+                calculating = false;
+            }
+        };
+        if(!calculating) {
+                calcThread = new Thread(calculator);
+                calcThread.setName("calcThread");
+                calcThread.start();
+        }
+    }
+    @FXML
+    private void stopCalculation(){
+        calcThread.interrupt();
+        calculating = false;
+        //Platform.runLater(() ->inputButton.setDisable(false));
     }
 
 }

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

@@ -31,9 +31,13 @@ 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;
         }
@@ -49,7 +53,10 @@ public class StandardPlugin extends Plugin {
 
         @Override
         protected NumberInterface applyInternal(NumberInterface[] params) {
+            if(Thread.currentThread().isInterrupted())
+                return null;
             return params[0].subtract(params[1]);
+
         }
     });
     /**
@@ -63,6 +70,8 @@ public class StandardPlugin extends Plugin {
 
         @Override
         protected NumberInterface applyInternal(NumberInterface[] params) {
+            if(Thread.currentThread().isInterrupted())
+                return null;
             return params[0].negate();
         }
     });
@@ -77,9 +86,13 @@ 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;
         }
@@ -95,6 +108,8 @@ public class StandardPlugin extends Plugin {
 
         @Override
         protected NumberInterface applyInternal(NumberInterface[] params) {
+            if(Thread.currentThread().isInterrupted())
+                return null;
             return params[0].divide(params[1]);
         }
     });
@@ -110,15 +125,19 @@ 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 ((multiplier = multiplier.subtract(NaiveNumber.ONE.promoteTo(multiplier.getClass()))).signum() == 1) {
+            while (!Thread.currentThread().isInterrupted()&&(multiplier = multiplier.subtract(NaiveNumber.ONE.promoteTo(multiplier.getClass())))!=null&&multiplier.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>());
@@ -138,7 +157,12 @@ public class StandardPlugin extends Plugin {
 
         @Override
         protected NumberInterface applyInternal(NumberInterface[] params) {
-            return FUNCTION_EXP.apply(FUNCTION_LN.apply(params[0]).multiply(params[1]));
+            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;
         }
     });
     /**
@@ -152,6 +176,8 @@ 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()));
         }
     };
@@ -166,14 +192,17 @@ 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;
-                while(FUNCTION_ABS.apply(currentTerm).compareTo(maxError) > 0){
+                NumberInterface check;
+                while((check = FUNCTION_ABS.apply(currentTerm))!=null && (check.compareTo(maxError) > 0)){
                     n++;
-                    currentTerm = currentTerm.multiply(params[0]).divide((new NaiveNumber(n)).promoteTo(params[0].getClass()));
-                    sum = sum.add(currentTerm);
+                    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;
                 }
                 return sum;
             }
@@ -182,18 +211,28 @@ 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 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;
                 do{
-                    sum = sum.add(nextNumerator.divide(factorial(params[0].getClass(), n+1)));
+                    if((check = factorial(params[0].getClass(),n+1))==null||(check = nextNumerator.divide(check))==null||(sum = sum.add(check))==null)
+                        return null;
                     n++;
-                    nextNumerator = nextNumerator.multiply(params[0]);
-                    left = left.multiply(params[0]);
+                    if((nextNumerator = nextNumerator.multiply(params[0]))==null)
+                        return null;
+                    if((left = left.multiply(params[0]))==null)
+                        return null;
                     NumberInterface nextN = (new NaiveNumber(n+1)).promoteTo(params[0].getClass());
-                    right = right.multiply(nextN);
+                    if((right = right.multiply(nextN))==null)
+                        return null;
                     //System.out.println(left + ", " + right);
                 }
-                while(left.compareTo(right) > 0);
+                while(!Thread.currentThread().isInterrupted()&&left.compareTo(right) > 0);
                 //System.out.println(n+1);
+               if(Thread.currentThread().isInterrupted())
+                    return null;
                 return sum;
             }
         }
@@ -209,26 +248,32 @@ public class StandardPlugin extends Plugin {
 
         @Override
         protected NumberInterface applyInternal(NumberInterface[] params) {
+            if(Thread.currentThread().isInterrupted())
+                return null;
             NumberInterface param = params[0];
             int powersOf2 = 0;
-            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) {
+            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) {
                     param = param.divide(new NaiveNumber(2).promoteTo(param.getClass()));
                     powersOf2++;
-                    if (param.subtract(NaiveNumber.ONE.promoteTo(param.getClass())).signum() != 1) {
+                    if ((check = param.subtract(NaiveNumber.ONE.promoteTo(param.getClass())))==null||check.signum() != 1) {
                         break;
                         //No infinite loop for you.
                     }
                 } else {
                     param = param.multiply(new NaiveNumber(2).promoteTo(param.getClass()));
                     powersOf2--;
-                    if (param.subtract(NaiveNumber.ONE.promoteTo(param.getClass())).signum() != -1) {
+                    if ((check = param.subtract(NaiveNumber.ONE.promoteTo(param.getClass())))==null||check.signum() != 1) {
                         break;
                         //No infinite loop for you.
                     }
                 }
             }
-            return getLog2(param).multiply((new NaiveNumber(powersOf2)).promoteTo(param.getClass())).add(getLogPartialSum(param));
+            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;
         }
 
         /**
@@ -238,16 +283,23 @@ 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;
-            while (FUNCTION_ABS.apply(currentTerm).compareTo(maxError) > 0) {
+            NumberInterface check;
+            while (!Thread.currentThread().isInterrupted()&&(check = FUNCTION_ABS.apply(currentTerm))!=null&&check.compareTo(maxError) > 0) {
                 n++;
-                currentNumerator = currentNumerator.multiply(x).negate();
+                if((currentNumerator = currentNumerator.multiply(x))==null||(currentNumerator = currentNumerator.negate())==null)
+                    return null;
                 currentTerm = currentNumerator.divide(new NaiveNumber(n).promoteTo(x.getClass()));
                 sum = sum.add(currentTerm);
             }
+            if(Thread.currentThread().isInterrupted())
+                return null;
             return sum;
         }
 
@@ -257,6 +309,8 @@ 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)
@@ -265,13 +319,17 @@ 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 (a.compareTo(maxError) >= 1) {
+            while (!Thread.currentThread().isInterrupted()&&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()));
-                sum = sum.add(a.add(b).multiply(c));
+                NumberInterface check;
+                if(a==null||(check = a.add(b))==null||(check = check.multiply(c))==null||(sum = sum.add(check))==null)
+                    return null;
             }
+            if(Thread.currentThread().isInterrupted())
+                return null;
             return sum;
         }
     };
@@ -345,6 +403,8 @@ 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.get(numberClass).add(NaiveNumber.ONE.promoteTo(numberClass));
@@ -352,11 +412,34 @@ public class StandardPlugin extends Plugin {
         }
         ArrayList<NumberInterface> list = factorialLists.get(numberClass);
         if(n >= list.size()){
-            while(list.size() < n + 16){
+            while(!Thread.currentThread().isInterrupted()&&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/BinaryNode.java

@@ -92,10 +92,15 @@ 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;
-        return reducer.reduceNode(this, leftReduce, rightReduce);
+        T a = reducer.reduceNode(this, leftReduce, rightReduce);
+        if(Thread.currentThread().isInterrupted())
+            return null;
+        return a;
     }
 
     @Override

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

@@ -62,12 +62,17 @@ 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 (reducedChildren[i] == null) return null;
+            if (Thread.currentThread().isInterrupted()||reducedChildren[i] == null) return null;
         }
-        return reducer.reduceNode(this, reducedChildren);
+        T a = reducer.reduceNode(this, reducedChildren);
+        if(Thread.currentThread().isInterrupted())
+            return null;
+        return a;
     }
 
     @Override

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

@@ -33,9 +33,14 @@ public class UnaryNode extends TreeNode {
 
     @Override
     public <T> T reduce(Reducer<T> reducer) {
+        if(Thread.currentThread().isInterrupted())
+            return null;
         Object reducedChild = applyTo.reduce(reducer);
         if (reducedChild == null) return null;
-        return reducer.reduceNode(this, reducedChild);
+        T a = reducer.reduceNode(this, reducedChild);
+        if(Thread.currentThread().isInterrupted())
+            return null;
+        return a;
     }
 
     /**

src/main/resources/abacus.fxml

@@ -37,6 +37,8 @@
                             <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>