Decrease test intensity to prevent travis CI from killing gradle.

# Conflicts:
#	src/main/java/org/nwapw/abacus/fx/AbacusController.java
#	src/main/java/org/nwapw/abacus/plugin/StandardPlugin.java

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

@@ -6,16 +6,12 @@ import org.nwapw.abacus.number.NumberInterface;
 import org.nwapw.abacus.parsing.LexerTokenizer;
 import org.nwapw.abacus.parsing.ShuntingYardParser;
 import org.nwapw.abacus.parsing.TreeBuilder;
-import org.nwapw.abacus.plugin.ClassFinder;
 import org.nwapw.abacus.plugin.NumberImplementation;
 import org.nwapw.abacus.plugin.PluginManager;
 import org.nwapw.abacus.plugin.StandardPlugin;
 import org.nwapw.abacus.tree.NumberReducer;
 import org.nwapw.abacus.tree.TreeNode;
 
-import java.io.File;
-import java.io.IOException;
-
 /**
  * The main calculator class. This is responsible
  * for piecing together all of the components, allowing
@@ -23,11 +19,10 @@ import java.io.IOException;
  */
 public class Abacus {
 
-    public static final NumberImplementation DEFAULT_IMPLEMENTATION = StandardPlugin.IMPLEMENTATION_NAIVE;
     /**
-     * The file used for saving and loading configuration.
+     * The default number implementation to be used if no other one is available / selected.
      */
-    public static final File CONFIG_FILE = new File("config.toml");
+    public static final NumberImplementation DEFAULT_IMPLEMENTATION = StandardPlugin.IMPLEMENTATION_NAIVE;
 
     /**
      * The plugin manager responsible for
@@ -52,25 +47,16 @@ public class Abacus {
     /**
      * Creates a new instance of the Abacus calculator.
      */
-    public Abacus() {
+    public Abacus(Configuration configuration) {
         pluginManager = new PluginManager(this);
         numberReducer = new NumberReducer(this);
-        configuration = new Configuration(CONFIG_FILE);
+        this.configuration = new Configuration(configuration);
-        configuration.saveTo(CONFIG_FILE);
         LexerTokenizer lexerTokenizer = new LexerTokenizer();
         ShuntingYardParser shuntingYardParser = new ShuntingYardParser(this);
         treeBuilder = new TreeBuilder<>(lexerTokenizer, shuntingYardParser);
 
-        pluginManager.addListener(lexerTokenizer);
         pluginManager.addListener(shuntingYardParser);
-        pluginManager.addInstantiated(new StandardPlugin(pluginManager));
+        pluginManager.addListener(lexerTokenizer);
-        try {
-            ClassFinder.loadJars("plugins")
-                    .forEach(plugin -> pluginManager.addClass(plugin));
-        } catch (IOException | ClassNotFoundException e) {
-            e.printStackTrace();
-        }
-        pluginManager.load();
     }
 
     public static void main(String[] args) {

src/main/java/org/nwapw/abacus/config/Configuration.java

@@ -39,8 +39,18 @@ public class Configuration {
      */
     private Set<String> disabledPlugins = new HashSet<>();
 
+    /**
+     * Creates a new configuration form the given configuration.
+     *
+     * @param copyFrom the configuration to copy.
+     */
+    public Configuration(Configuration copyFrom){
+        copyFrom(copyFrom);
+    }
+
     /**
      * Creates a new configuration with the given values.
+     *
      * @param numberImplementation the number implementation, like "naive" or "precise"
      * @param disabledPlugins      the list of disabled plugins.
      */
@@ -51,6 +61,7 @@ public class Configuration {
 
     /**
      * Loads a configuration from a given file, keeping non-specified fields default.
+     *
      * @param fromFile the file to load from.
      */
     public Configuration(File fromFile) {
@@ -60,6 +71,7 @@ public class Configuration {
 
     /**
      * Copies the values from the given configuration into this one.
+     *
      * @param otherConfiguration the configuration to copy from.
      */
     public void copyFrom(Configuration otherConfiguration) {
@@ -70,6 +82,7 @@ public class Configuration {
     /**
      * Saves this configuration to the given file, creating
      * any directories that do not exist.
+     *
      * @param file the file to save to.
      */
     public void saveTo(File file) {
@@ -81,8 +94,18 @@ public class Configuration {
         }
     }
 
+    /**
+     * Gets the value of this configuration as a string.
+     *
+     * @return the string that represents this configuration.
+     */
+    public String asTomlString(){
+        return TOML_WRITER.write(this);
+    }
+
     /**
      * Gets the number implementation from this configuration.
+     *
      * @return the number implementation.
      */
     public String getNumberImplementation() {
@@ -91,6 +114,7 @@ public class Configuration {
 
     /**
      * Sets the number implementation for the configuration
+     *
      * @param numberImplementation the number implementation.
      */
     public void setNumberImplementation(String numberImplementation) {
@@ -99,6 +123,7 @@ public class Configuration {
 
     /**
      * Gets the list of disabled plugins.
+     *
      * @return the list of disabled plugins.
      */
     public Set<String> getDisabledPlugins() {

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;
@@ -11,10 +12,14 @@ import javafx.util.StringConverter;
 import org.nwapw.abacus.Abacus;
 import org.nwapw.abacus.config.Configuration;
 import org.nwapw.abacus.number.NumberInterface;
+import org.nwapw.abacus.plugin.ClassFinder;
 import org.nwapw.abacus.plugin.PluginListener;
 import org.nwapw.abacus.plugin.PluginManager;
+import org.nwapw.abacus.plugin.StandardPlugin;
 import org.nwapw.abacus.tree.TreeNode;
 
+import java.io.File;
+import java.io.IOException;
 import java.util.Set;
 
 
@@ -24,6 +29,10 @@ import java.util.Set;
  */
 public class AbacusController implements PluginListener {
 
+    /**
+     * The file used for saving and loading configuration.
+     */
+    public static final File CONFIG_FILE = new File("config.toml");
     /**
      * The title for the apply alert dialog.
      */
@@ -45,7 +54,10 @@ public class AbacusController implements PluginListener {
      * 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 TabPane coreTabPane;
     @FXML
@@ -83,6 +95,7 @@ public class AbacusController implements PluginListener {
     private ObservableList<String> numberImplementationOptions;
 
     /**
+     * <<<<<<< HEAD
      * The list of plugin objects that can be toggled on and off,
      * and, when reloaded, get added to the plugin manager's black list.
      */
@@ -92,6 +105,20 @@ public class AbacusController implements PluginListener {
      * The abacus instance used for changing the plugin configuration.
      */
     private Abacus abacus;
+    /**
+     * Thread used for calculating.
+     */
+    private Thread calcThread;
+
+    /**
+     * Checks whether the calculator is calculating.
+     */
+    private boolean calculating;
+
+    /**
+     * Seconds delayed for timer;
+     */
+    private double delay = 0;
 
     /**
      * Boolean which represents whether changes were made to the configuration.
@@ -153,9 +180,16 @@ public class AbacusController implements PluginListener {
             if (oldValue.equals(settingsTab)) alertIfApplyNeeded(true);
         });
 
-        abacus = new Abacus();
+        abacus = new Abacus(new Configuration(CONFIG_FILE));
-        abacus.getPluginManager().addListener(this);
+        PluginManager abacusPluginManager = abacus.getPluginManager();
-        abacus.getPluginManager().reload();
+        abacusPluginManager.addListener(this);
+        abacusPluginManager.addInstantiated(new StandardPlugin(abacus.getPluginManager()));
+        try {
+            ClassFinder.loadJars("plugins").forEach(abacusPluginManager::addClass);
+        } catch (IOException | ClassNotFoundException e) {
+            e.printStackTrace();
+        }
+        abacusPluginManager.reload();
 
         changesMade = false;
         reloadAlertShown = false;
@@ -168,24 +202,63 @@ public class AbacusController implements PluginListener {
 
     @FXML
     private void performCalculation() {
-        inputButton.setDisable(true);
+        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) {
-            outputText.setText(ERR_SYNTAX);
+                    Platform.runLater(() -> outputText.setText(ERR_SYNTAX));
-            inputButton.setDisable(false);
+                    Platform.runLater(() -> inputButton.setDisable(false));
-            return;
+                    //return;
-        }
+                } else {
                     NumberInterface evaluatedNumber = abacus.evaluateTree(constructedTree);
                     if (evaluatedNumber == null) {
-            outputText.setText(ERR_EVAL);
+                        if (Thread.currentThread().isInterrupted()) {
-            inputButton.setDisable(false);
+                            Platform.runLater(() -> outputText.setText(ERR_STOP));
-            return;
+                            Platform.runLater(() -> inputButton.setDisable(false));
+                        } else {
+                            Platform.runLater(() -> outputText.setText(ERR_EVAL));
+                            Platform.runLater(() -> inputButton.setDisable(false));
+                            //return;
                         }
-        outputText.setText(evaluatedNumber.toString());
+                    } else {
+                        Platform.runLater(() -> outputText.setText(evaluatedNumber.toString()));
                         historyData.add(new HistoryModel(inputField.getText(), constructedTree.toString(), evaluatedNumber.toString()));
 
-        inputButton.setDisable(false);
+                        Platform.runLater(() -> inputButton.setDisable(false));
-        inputField.setText("");
+                        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));
     }
 
     @FXML
@@ -211,7 +284,7 @@ public class AbacusController implements PluginListener {
         for (ToggleablePlugin pluginEntry : enabledPlugins) {
             if (!pluginEntry.isEnabled()) disabledPlugins.add(pluginEntry.getClassName());
         }
-        configuration.saveTo(Abacus.CONFIG_FILE);
+        configuration.saveTo(CONFIG_FILE);
         changesMade = false;
         reloadAlertShown = false;
     }

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

@@ -9,6 +9,7 @@ import java.awt.datatransfer.StringSelection;
 /**
  * A cell that copies its value to the clipboard
  * when double clicked.
+ *
  * @param <S> The type of the table view generic type.
  * @param <T> The type of the value contained in the cell.
  */

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

@@ -26,6 +26,7 @@ public class HistoryModel {
 
     /**
      * Creates a new history model with the given variables.
+     *
      * @param input  the user input
      * @param parsed the parsed input
      * @param output the program output.
@@ -41,13 +42,16 @@ public class HistoryModel {
 
     /**
      * Gets the input property.
+     *
      * @return the input property.
      */
     public StringProperty inputProperty() {
         return input;
     }
+
     /**
      * Gets the input.
+     *
      * @return the input.
      */
     public String getInput() {
@@ -56,13 +60,16 @@ public class HistoryModel {
 
     /**
      * Gets the parsed input property.
+     *
      * @return the parsed input property.
      */
     public StringProperty parsedProperty() {
         return parsed;
     }
+
     /**
      * Gets the parsed input.
+     *
      * @return the parsed input.
      */
     public String getParsed() {
@@ -71,13 +78,16 @@ public class HistoryModel {
 
     /**
      * Gets the output property.
+     *
      * @return the output property.
      */
     public StringProperty outputProperty() {
         return output;
     }
+
     /**
      * Gets the program output.
+     *
      * @return the output.
      */
     public String getOutput() {

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

@@ -20,6 +20,7 @@ public class ToggleablePlugin {
 
     /**
      * Creates a new toggleable plugin with the given properties.
+     *
      * @param enabled   the enabled / disabled state at the beginning.
      * @param className the name of the class this plugin toggles.
      */
@@ -31,6 +32,7 @@ public class ToggleablePlugin {
 
     /**
      * Gets the enabled property of this plugin.
+     *
      * @return the enabled property.
      */
     public BooleanProperty enabledProperty() {
@@ -39,6 +41,7 @@ public class ToggleablePlugin {
 
     /**
      * Checks if this plugin entry should be enabled.
+     *
      * @return whether this plugin will be enabled.
      */
     public boolean isEnabled() {
@@ -47,6 +50,7 @@ public class ToggleablePlugin {
 
     /**
      * Gets the class name this plugin toggles.
+     *
      * @return the class name that should be disabled.
      */
     public String getClassName() {

src/main/java/org/nwapw/abacus/number/NaiveNumber.java

@@ -26,6 +26,7 @@ public class NaiveNumber implements NumberInterface {
     public NaiveNumber(String value) {
         this(Double.parseDouble(value));
     }
+
     /**
      * Creates a new NaiveNumber with the given value.
      *

src/main/java/org/nwapw/abacus/number/NumberInterface.java

@@ -81,18 +81,21 @@ public interface NumberInterface {
 
     /**
      * Returns the least integer greater than or equal to the number.
+     *
      * @return the least integer >= the number, if int can hold the value.
      */
     NumberInterface ceiling();
 
     /**
      * Return the greatest integer less than or equal to the number.
+     *
      * @return the greatest int >= the number, if int can hold the value.
      */
     NumberInterface floor();
 
     /**
      * Returns the fractional part of the number.
+     *
      * @return the fractional part of the number.
      */
     NumberInterface fractionalPart();
@@ -100,6 +103,7 @@ public interface NumberInterface {
     /**
      * Returns the integer representation of this number, discarding any fractional part,
      * if int can hold the value.
+     *
      * @return
      */
     int intValue();

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

@@ -26,6 +26,7 @@ public abstract class NumberImplementation {
 
     /**
      * Creates a new number implementation with the given data.
+     *
      * @param implementation the implementation class.
      * @param priority       the priority, higher -> more likely to be converted into.
      */
@@ -37,6 +38,7 @@ public abstract class NumberImplementation {
 
     /**
      * Gets the list of all promotion paths this implementation can take.
+     *
      * @return the map of documentation paths.
      */
     public final Map<Class<? extends NumberInterface>, Function<NumberInterface, NumberInterface>> getPromotionPaths() {
@@ -45,6 +47,7 @@ public abstract class NumberImplementation {
 
     /**
      * Gets the implementation class used by this implementation.
+     *
      * @return the implementation class.
      */
     public final Class<? extends NumberInterface> getImplementation() {
@@ -53,6 +56,7 @@ public abstract class NumberImplementation {
 
     /**
      * Gets the priority of this number implementation.
+     *
      * @return the priority.
      */
     public final int getPriority() {
@@ -61,6 +65,7 @@ public abstract class NumberImplementation {
 
     /**
      * Abstract function to create a new instance from a string.
+     *
      * @param string the string to create a number from.
      * @return the resulting number.
      */
@@ -68,6 +73,7 @@ public abstract class NumberImplementation {
 
     /**
      * Get the instance of pi with the given implementation.
+     *
      * @return pi
      */
     public abstract NumberInterface instanceForPi();

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

@@ -160,6 +160,7 @@ public abstract class Plugin {
     /**
      * To be used in load(). Registers a new number implementation with the plugin.
      * This makes it accessible to the plugin manager.
+     *
      * @param name           the name of the implementation.
      * @param implementation the actual implementation class to register.
      */
@@ -208,6 +209,7 @@ public abstract class Plugin {
      * This is done so that number implementations with various degrees of precision
      * can provide their own pi values, without losing said precision by
      * promoting NaiveNumbers.
+     *
      * @param forClass the class to which to find the pi instance.
      * @return the pi value for the given class.
      */

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

@@ -141,6 +141,7 @@ public class PluginManager {
 
     /**
      * Gets the number implementation under the given name.
+     *
      * @param name the name of the implementation.
      * @return the implementation.
      */
@@ -151,6 +152,7 @@ public class PluginManager {
 
     /**
      * Gets the number implementation for the given implementation class.
+     *
      * @param name the class for which to find the implementation.
      * @return the implementation.
      */
@@ -173,6 +175,7 @@ public class PluginManager {
 
     /**
      * Gets the mathematical constant pi for the given implementation class.
+     *
      * @param forClass the class for which to find pi.
      * @return pi
      */
@@ -308,6 +311,7 @@ public class PluginManager {
     /**
      * Gets a list of all the plugin class files that have been
      * added to the plugin manager.
+     *
      * @return the list of all the added plugin classes.
      */
     public Set<Class<?>> getLoadedPluginClasses() {

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

@@ -18,8 +18,6 @@ import java.util.function.BiFunction;
  */
 public class StandardPlugin extends Plugin {
 
-    private static final HashMap<Class<? extends NumberInterface>, ArrayList<NumberInterface>> FACTORIAL_LISTS = new HashMap<>();
-
     /**
      * The addition operator, +
      */
@@ -31,9 +29,13 @@ 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 +51,10 @@ 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 +68,8 @@ public class StandardPlugin extends Plugin {
 
         @Override
         protected NumberInterface applyInternal(NumberInterface[] params) {
+            if (Thread.currentThread().isInterrupted())
+                return null;
             return params[0].negate();
         }
     });
@@ -77,9 +84,13 @@ 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 +106,8 @@ public class StandardPlugin extends Plugin {
 
         @Override
         protected NumberInterface applyInternal(NumberInterface[] params) {
+            if (Thread.currentThread().isInterrupted())
+                return null;
             return params[0].divide(params[1]);
         }
     });
@@ -112,15 +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>());
@@ -129,20 +146,6 @@ public class StandardPlugin extends Plugin {
                 }*/
         }
     });
-    /**
-     * The caret / pow operator, ^
-     */
-    public static final Operator OP_CARET = new Operator(OperatorAssociativity.RIGHT, OperatorType.BINARY_INFIX, 2, new Function() {
-        @Override
-        protected boolean matchesParams(NumberInterface[] params) {
-            return params.length == 2;
-        }
-
-        @Override
-        protected NumberInterface applyInternal(NumberInterface[] params) {
-            return FUNCTION_EXP.apply(FUNCTION_LN.apply(params[0]).multiply(params[1]));
-        }
-    });
     /**
      * The absolute value function, abs(-3) = 3
      */
@@ -154,52 +157,11 @@ 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()));
         }
     };
-    /**
-     * The exponential function, exp(1) = e^1 = 2.71...
-     */
-    public static final Function FUNCTION_EXP = new Function() {
-        @Override
-        protected boolean matchesParams(NumberInterface[] params) {
-            return params.length == 1;
-        }
-
-        @Override
-        protected NumberInterface applyInternal(NumberInterface[] params) {
-            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){
-                    n++;
-                    currentTerm = currentTerm.multiply(params[0]).divide((new NaiveNumber(n)).promoteTo(params[0].getClass()));
-                    sum = sum.add(currentTerm);
-                }
-                return sum;
-            }
-            else{
-                //We need n such that x^(n+1) * 3^ceil(x) <= maxError * (n+1)!.
-                //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().intValue())), right = maxError;
-                do{
-                    sum = sum.add(nextNumerator.divide(factorial(params[0].getClass(), n+1)));
-                    n++;
-                    nextNumerator = nextNumerator.multiply(params[0]);
-                    left = left.multiply(params[0]);
-                    NumberInterface nextN = (new NaiveNumber(n+1)).promoteTo(params[0].getClass());
-                    right = right.multiply(nextN);
-                    //System.out.println(left + ", " + right);
-                }
-                while(left.compareTo(right) > 0);
-                //System.out.println(n+1);
-                return sum;
-            }
-        }
-    };
     /**
      * The natural log function.
      */
@@ -211,26 +173,32 @@ 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) {
+            NumberInterface check;
-                if (param.subtract(NaiveNumber.ONE.promoteTo(param.getClass())).signum() == 1) {
+            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;
         }
 
         /**
@@ -240,16 +208,23 @@ 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;
         }
 
@@ -259,6 +234,8 @@ 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)
@@ -267,13 +244,17 @@ 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;
         }
     };
@@ -291,109 +272,6 @@ public class StandardPlugin extends Plugin {
             return OP_CARET.getFunction().apply(params[0], ((new NaiveNumber(0.5)).promoteTo(params[0].getClass())));
         }
     };
-
-    /**
-     * The sine function (the argument is interpreted in radians).
-     */
-    public final Function functionSin = new Function() {
-        @Override
-        protected boolean matchesParams(NumberInterface[] params) {
-            return params.length == 1;
-        }
-
-        @Override
-        protected NumberInterface applyInternal(NumberInterface[] params) {
-            NumberInterface pi = getPi(params[0].getClass());
-            NumberInterface twoPi = pi.multiply(new NaiveNumber(2).promoteTo(pi.getClass()));
-            NumberInterface theta = getSmallAngle(params[0], pi);
-            //System.out.println(theta);
-            if(theta.compareTo(pi.multiply(new NaiveNumber(1.5).promoteTo(twoPi.getClass()))) >= 0){
-                theta = theta.subtract(twoPi);
-            }
-            else if(theta.compareTo(pi.divide(new NaiveNumber(2).promoteTo(pi.getClass()))) > 0){
-                theta = pi.subtract(theta);
-            }
-            //System.out.println(theta);
-            return sinTaylor(theta);
-        }
-    };
-
-    /**
-     * The cosine function (the argument is in radians).
-     */
-    public final Function functionCos = new Function() {
-        @Override
-        protected boolean matchesParams(NumberInterface[] params) {
-            return params.length == 1;
-        }
-
-        @Override
-        protected NumberInterface applyInternal(NumberInterface[] params) {
-            return functionSin.apply(getPi(params[0].getClass()).divide(new NaiveNumber(2).promoteTo(params[0].getClass()))
-                .subtract(params[0]));
-        }
-    };
-
-    /**
-     * The tangent function (the argument is in radians).
-     */
-    public final Function functionTan = new Function() {
-        @Override
-        protected boolean matchesParams(NumberInterface[] params) {
-            return params.length == 1;
-        }
-
-        @Override
-        protected NumberInterface applyInternal(NumberInterface[] params) {
-            return functionSin.apply(params[0]).divide(functionCos.apply(params[0]));
-        }
-    };
-
-    /**
-     * The secant function (the argument is in radians).
-     */
-    public final Function functionSec = new Function() {
-        @Override
-        protected boolean matchesParams(NumberInterface[] params) {
-            return params.length == 1;
-        }
-
-        @Override
-        protected NumberInterface applyInternal(NumberInterface[] params) {
-            return NaiveNumber.ONE.promoteTo(params[0].getClass()).divide(functionCos.apply(params[0]));
-        }
-    };
-
-    /**
-     * The cosecant function (the argument is in radians).
-     */
-    public final Function functionCsc = new Function() {
-        @Override
-        protected boolean matchesParams(NumberInterface[] params) {
-            return params.length == 1;
-        }
-
-        @Override
-        protected NumberInterface applyInternal(NumberInterface[] params) {
-            return NaiveNumber.ONE.promoteTo(params[0].getClass()).divide(functionSin.apply(params[0]));
-        }
-    };
-
-    /**
-     * The cotangent function (the argument is in radians).
-     */
-    public final Function functionCot = new Function() {
-        @Override
-        protected boolean matchesParams(NumberInterface[] params) {
-            return params.length == 1;
-        }
-
-        @Override
-        protected NumberInterface applyInternal(NumberInterface[] params) {
-            return functionCos.apply(params[0]).divide(functionCos.apply(params[0]));
-        }
-    };
-
     /**
      * The implementation for double-based naive numbers.
      */
@@ -408,7 +286,6 @@ public class StandardPlugin extends Plugin {
             return new NaiveNumber(Math.PI);
         }
     };
-
     /**
      * The implementation for the infinite-precision BigDecimal.
      */
@@ -445,6 +322,168 @@ public class StandardPlugin extends Plugin {
             return C.divide(sum);
         }
     };
+    private static final HashMap<Class<? extends NumberInterface>, ArrayList<NumberInterface>> FACTORIAL_LISTS = new HashMap<>();
+    /**
+     * The exponential function, exp(1) = e^1 = 2.71...
+     */
+    public static final Function FUNCTION_EXP = new Function() {
+        @Override
+        protected boolean matchesParams(NumberInterface[] params) {
+            return params.length == 1;
+        }
+
+        @Override
+        protected NumberInterface applyInternal(NumberInterface[] params) {
+            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) {
+                    n++;
+                    currentTerm = currentTerm.multiply(params[0]).divide((new NaiveNumber(n)).promoteTo(params[0].getClass()));
+                    sum = sum.add(currentTerm);
+                }
+                return sum;
+            } else {
+                //We need n such that x^(n+1) * 3^ceil(x) <= maxError * (n+1)!.
+                //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().intValue())), right = maxError;
+                do {
+                    sum = sum.add(nextNumerator.divide(factorial(params[0].getClass(), n + 1)));
+                    n++;
+                    nextNumerator = nextNumerator.multiply(params[0]);
+                    left = left.multiply(params[0]);
+                    NumberInterface nextN = (new NaiveNumber(n + 1)).promoteTo(params[0].getClass());
+                    right = right.multiply(nextN);
+                    //System.out.println(left + ", " + right);
+                }
+                while (left.compareTo(right) > 0);
+                //System.out.println(n+1);
+                return sum;
+            }
+        }
+    };
+    /**
+     * The caret / pow operator, ^
+     */
+    public static final Operator OP_CARET = new Operator(OperatorAssociativity.RIGHT, OperatorType.BINARY_INFIX, 2, new Function() {
+        @Override
+        protected boolean matchesParams(NumberInterface[] params) {
+            return params.length == 2
+                    && !(params[0].compareTo(NaiveNumber.ZERO.promoteTo(params[0].getClass())) == 0
+                    && params[1].compareTo(NaiveNumber.ZERO.promoteTo(params[1].getClass())) == 0);
+        }
+
+        @Override
+        protected NumberInterface applyInternal(NumberInterface[] params) {
+            if (Thread.currentThread().isInterrupted()) return null;
+            else if (params[0].compareTo(NaiveNumber.ZERO.promoteTo(params[0].getClass())) == 0)
+                return NaiveNumber.ZERO.promoteTo(params[0].getClass());
+            else if (params[1].compareTo(NaiveNumber.ZERO.promoteTo(params[0].getClass())) == 0)
+                return NaiveNumber.ONE.promoteTo(params[1].getClass());
+            FUNCTION_EXP.apply(FUNCTION_LN.apply(FUNCTION_ABS.apply(params[0])).multiply(params[1]));
+            NumberInterface check = FUNCTION_LN.apply(FUNCTION_ABS.apply(params[0]));
+            if(check == null) return null;
+            return FUNCTION_EXP.apply(check.multiply(params[1]));
+        }
+    });
+    /**
+     * The sine function (the argument is interpreted in radians).
+     */
+    public final Function functionSin = new Function() {
+        @Override
+        protected boolean matchesParams(NumberInterface[] params) {
+            return params.length == 1;
+        }
+
+        @Override
+        protected NumberInterface applyInternal(NumberInterface[] params) {
+            NumberInterface pi = getPi(params[0].getClass());
+            NumberInterface twoPi = pi.multiply(new NaiveNumber(2).promoteTo(pi.getClass()));
+            NumberInterface theta = getSmallAngle(params[0], pi);
+            //System.out.println(theta);
+            if (theta.compareTo(pi.multiply(new NaiveNumber(1.5).promoteTo(twoPi.getClass()))) >= 0) {
+                theta = theta.subtract(twoPi);
+            } else if (theta.compareTo(pi.divide(new NaiveNumber(2).promoteTo(pi.getClass()))) > 0) {
+                theta = pi.subtract(theta);
+            }
+            //System.out.println(theta);
+            return sinTaylor(theta);
+        }
+    };
+    /**
+     * The cosine function (the argument is in radians).
+     */
+    public final Function functionCos = new Function() {
+        @Override
+        protected boolean matchesParams(NumberInterface[] params) {
+            return params.length == 1;
+        }
+
+        @Override
+        protected NumberInterface applyInternal(NumberInterface[] params) {
+            return functionSin.apply(getPi(params[0].getClass()).divide(new NaiveNumber(2).promoteTo(params[0].getClass()))
+                    .subtract(params[0]));
+        }
+    };
+    /**
+     * The tangent function (the argument is in radians).
+     */
+    public final Function functionTan = new Function() {
+        @Override
+        protected boolean matchesParams(NumberInterface[] params) {
+            return params.length == 1;
+        }
+
+        @Override
+        protected NumberInterface applyInternal(NumberInterface[] params) {
+            return functionSin.apply(params[0]).divide(functionCos.apply(params[0]));
+        }
+    };
+    /**
+     * The secant function (the argument is in radians).
+     */
+    public final Function functionSec = new Function() {
+        @Override
+        protected boolean matchesParams(NumberInterface[] params) {
+            return params.length == 1;
+        }
+
+        @Override
+        protected NumberInterface applyInternal(NumberInterface[] params) {
+            return NaiveNumber.ONE.promoteTo(params[0].getClass()).divide(functionCos.apply(params[0]));
+        }
+    };
+    /**
+     * The cosecant function (the argument is in radians).
+     */
+    public final Function functionCsc = new Function() {
+        @Override
+        protected boolean matchesParams(NumberInterface[] params) {
+            return params.length == 1;
+        }
+
+        @Override
+        protected NumberInterface applyInternal(NumberInterface[] params) {
+            return NaiveNumber.ONE.promoteTo(params[0].getClass()).divide(functionSin.apply(params[0]));
+        }
+    };
+    /**
+     * The cotangent function (the argument is in radians).
+     */
+    public final Function functionCot = new Function() {
+        @Override
+        protected boolean matchesParams(NumberInterface[] params) {
+            return params.length == 1;
+        }
+
+        @Override
+        protected NumberInterface applyInternal(NumberInterface[] params) {
+            return functionCos.apply(params[0]).divide(functionCos.apply(params[0]));
+        }
+    };
 
     public StandardPlugin(PluginManager manager) {
         super(manager);
@@ -476,6 +515,90 @@ public class StandardPlugin extends Plugin {
         return (new NaiveNumber(10)).promoteTo(number.getClass()).intPow(-number.getMaxPrecision());
     }
 
+    /**
+     * A factorial function that uses memoization for each number class; it efficiently
+     * computes factorials of non-negative integers.
+     *
+     * @param numberClass type of number to return.
+     * @param n           non-negative integer.
+     * @return a number of numClass with value n factorial.
+     */
+    public static NumberInterface factorial(Class<? extends NumberInterface> numberClass, int n) {
+        if (Thread.currentThread().isInterrupted())
+            return null;
+        if (!FACTORIAL_LISTS.containsKey(numberClass)) {
+            FACTORIAL_LISTS.put(numberClass, new ArrayList<>());
+            FACTORIAL_LISTS.get(numberClass).add(NaiveNumber.ONE.promoteTo(numberClass));
+            FACTORIAL_LISTS.get(numberClass).add(NaiveNumber.ONE.promoteTo(numberClass));
+        }
+        ArrayList<NumberInterface> list = FACTORIAL_LISTS.get(numberClass);
+        if (n >= list.size()) {
+            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);
+    }
+
+    /**
+     * Returns the value of the Taylor series for sin (centered at 0) at x.
+     *
+     * @param x where the series is evaluated.
+     * @return the value of the series
+     */
+    private static NumberInterface sinTaylor(NumberInterface x) {
+        NumberInterface power = x, multiplier = x.multiply(x).negate(), currentTerm = x, sum = x;
+        NumberInterface maxError = getMaxError(x);
+        int n = 1;
+        do {
+            n += 2;
+            power = power.multiply(multiplier);
+            currentTerm = power.divide(factorial(x.getClass(), n));
+            sum = sum.add(currentTerm);
+        } while (FUNCTION_ABS.apply(currentTerm).compareTo(maxError) > 0);
+        return sum;
+    }
+
+    /**
+     * Returns an equivalent angle in the interval [0, 2pi)
+     *
+     * @param phi an angle (in radians).
+     * @return theta in [0, 2pi) that differs from phi by a multiple of 2pi.
+     */
+    private static NumberInterface getSmallAngle(NumberInterface phi, NumberInterface pi) {
+        NumberInterface twoPi = pi.multiply(new NaiveNumber("2").promoteTo(phi.getClass()));
+        NumberInterface theta = FUNCTION_ABS.apply(phi).subtract(twoPi
+                .multiply(FUNCTION_ABS.apply(phi).divide(twoPi).floor())); //Now theta is in [0, 2pi).
+        if (phi.signum() < 0) {
+            theta = twoPi.subtract(theta);
+        }
+        return theta;
+    }
+
+    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;
+    }
+
     @Override
     public void onEnable() {
         registerNumberImplementation("naive", IMPLEMENTATION_NAIVE);
@@ -505,59 +628,4 @@ public class StandardPlugin extends Plugin {
     public void onDisable() {
 
     }
-
-    /**
-     * A factorial function that uses memoization for each number class; it efficiently
-     * computes factorials of non-negative integers.
-     * @param numberClass type of number to return.
-     * @param n non-negative integer.
-     * @return a number of numClass with value n factorial.
-     */
-    public static NumberInterface factorial(Class<? extends NumberInterface> numberClass, int n){
-        if(!FACTORIAL_LISTS.containsKey(numberClass)){
-            FACTORIAL_LISTS.put(numberClass, new ArrayList<>());
-            FACTORIAL_LISTS.get(numberClass).add(NaiveNumber.ONE.promoteTo(numberClass));
-            FACTORIAL_LISTS.get(numberClass).add(NaiveNumber.ONE.promoteTo(numberClass));
-        }
-        ArrayList<NumberInterface> list = FACTORIAL_LISTS.get(numberClass);
-        if(n >= list.size()){
-            while(list.size() < n + 16){
-                list.add(list.get(list.size()-1).multiply(new NaiveNumber(list.size()).promoteTo(numberClass)));
-            }
-        }
-        return list.get(n);
-    }
-
-    /**
-     * Returns the value of the Taylor series for sin (centered at 0) at x.
-     * @param x where the series is evaluated.
-     * @return the value of the series
-     */
-    private static NumberInterface sinTaylor(NumberInterface x){
-        NumberInterface power = x, multiplier = x.multiply(x).negate(), currentTerm = x, sum = x;
-        NumberInterface maxError = getMaxError(x);
-        int n = 1;
-        do{
-            n += 2;
-            power = power.multiply(multiplier);
-            currentTerm = power.divide(factorial(x.getClass(), n));
-            sum = sum.add(currentTerm);
-        } while (FUNCTION_ABS.apply(currentTerm).compareTo(maxError) > 0);
-        return sum;
-    }
-
-    /**
-     * Returns an equivalent angle in the interval [0, 2pi)
-     * @param phi an angle (in radians).
-     * @return theta in [0, 2pi) that differs from phi by a multiple of 2pi.
-     */
-    private static NumberInterface getSmallAngle(NumberInterface phi, NumberInterface pi){
-        NumberInterface twoPi = pi.multiply(new NaiveNumber("2").promoteTo(phi.getClass()));
-        NumberInterface theta = FUNCTION_ABS.apply(phi).subtract(twoPi
-        .multiply(FUNCTION_ABS.apply(phi).divide(twoPi).floor())); //Now theta is in [0, 2pi).
-        if(phi.signum() < 0){
-            theta = twoPi.subtract(theta);
-        }
-        return theta;
-    }
 }

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

@@ -2,14 +2,10 @@
 
 <?import javafx.geometry.Insets?>
 <?import javafx.scene.control.*?>
-<?import javafx.scene.layout.BorderPane?>
+<?import javafx.scene.layout.*?>
-<?import javafx.scene.layout.VBox?>
 <?import javafx.scene.text.Text?>
-<?import javafx.scene.layout.HBox?>
+<BorderPane xmlns:fx="http://javafx.com/fxml"
-<?import javafx.scene.layout.GridPane?>
+            xmlns="http://javafx.com/javafx"
-<?import javafx.scene.layout.FlowPane?>
-<BorderPane xmlns="http://javafx.com/javafx"
-            xmlns:fx="http://javafx.com/fxml"
             fx:controller="org.nwapw.abacus.fx.AbacusController">
     <center>
         <TabPane fx:id="coreTabPane">
@@ -38,19 +34,24 @@
                             <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>
             </Tab>
             <Tab fx:id="settingsTab" text="Settings" closable="false">
                 <GridPane hgap="10" vgap="10">
-                    <padding><Insets left="10" right="10" top="10" bottom="10"/></padding>
+                    <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"/>
                     <ListView fx:id="enabledPluginView"
                               GridPane.rowIndex="1" GridPane.columnIndex="0"
                               GridPane.columnSpan="2" maxHeight="100"/>
-                    <FlowPane GridPane.columnIndex="0" GridPane.columnSpan="2" GridPane.rowIndex="2" hgap="10" vgap="10">
+                    <FlowPane GridPane.columnIndex="0" GridPane.columnSpan="2" GridPane.rowIndex="2" hgap="10"
+                              vgap="10">
                         <Button text="Apply" onAction="#performSave"/>
                         <Button text="Reload Plugins" onAction="#performReload"/>
                         <Button text="Apply and Reload" onAction="#performSaveAndReload"/>

src/test/java/org/nwapw/abacus/tests/CalculationTests.java

@@ -0,0 +1,104 @@
+package org.nwapw.abacus.tests;
+
+import org.junit.Assert;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.nwapw.abacus.Abacus;
+import org.nwapw.abacus.config.Configuration;
+import org.nwapw.abacus.number.NumberInterface;
+import org.nwapw.abacus.plugin.StandardPlugin;
+import org.nwapw.abacus.tree.TreeNode;
+
+public class CalculationTests {
+
+    private static Abacus abacus = new Abacus(new Configuration("precise", new String[]{}));
+
+    @BeforeClass
+    public static void prepareTests(){
+        abacus.getPluginManager().addInstantiated(new StandardPlugin(abacus.getPluginManager()));
+        abacus.getPluginManager().load();
+    }
+
+    private void testOutput(String input, String parseOutput, String output){
+        TreeNode parsedTree = abacus.parseString(input);
+        Assert.assertNotNull(parsedTree);
+        Assert.assertEquals(parsedTree.toString(), parseOutput);
+        NumberInterface result = abacus.evaluateTree(parsedTree);
+        Assert.assertNotNull(result);
+        Assert.assertTrue(result.toString().startsWith(output));
+    }
+
+    private void testEvalError(String input, String parseOutput){
+        TreeNode parsedTree = abacus.parseString(input);
+        Assert.assertNotNull(parsedTree);
+        Assert.assertEquals(parsedTree.toString(), parseOutput);
+        Assert.assertNull(abacus.evaluateTree(parsedTree));
+    }
+
+    @Test
+    public void testAddition(){
+        testOutput("9.5+10", "(9.5+10)", "19.5");
+    }
+
+    @Test
+    public void testSubtraction(){
+        testOutput("9.5-10", "(9.5-10)", "-0.5");
+    }
+
+    @Test
+    public void testMultiplication(){
+        testOutput("9.5*10", "(9.5*10)", "95");
+    }
+
+    @Test
+    public void testDivision(){
+        testOutput("9.5/2", "(9.5/2)", "4.75");
+    }
+
+    @Test
+    public void testNegation(){
+        testOutput("-9.5", "(9.5)`", "-9.5");
+    }
+
+    @Test
+    public void testFactorial(){
+        testOutput("7!", "(7)!", "5040");
+    }
+
+    @Test
+    public void testAbs(){
+        testOutput("abs(-1)", "abs((1)`)", "1");
+        testOutput("abs(1)", "abs(1)", "1");
+    }
+
+    @Test
+    public void testLn(){
+        testEvalError("ln(-1)", "ln((1)`)");
+        testOutput("ln2", "ln(2)", "0.6931471805599453094172321214581765680755");
+    }
+
+    @Test
+    public void testSqrt(){
+        testOutput("sqrt0", "sqrt(0)", "0");
+        testOutput("sqrt4", "sqrt(4)", "2");
+        testOutput("sqrt2", "sqrt(2)", "1.4142135623730950488016887242096980785696");
+    }
+
+    @Test
+    public void testExp(){
+        testOutput("exp0", "exp(0)", "1");
+        testOutput("exp1", "exp(1)", "2.718281828459045235360287471352662497757247");
+        testOutput("exp300", "exp(300)", "19424263952412559365842088360176992193662086");
+        testOutput("exp300", "exp(300)", "19424263952412559365842088360176992193662086");
+    }
+
+    @Test
+    public void testPow(){
+        testOutput("0^2", "(0^2)", "0");
+        testOutput("2^0", "(2^0)", "1");
+        testOutput("2^1", "(2^1)", "2");
+        testOutput("2^-1", "(2^(1)`)", "0.5");
+        testOutput("2^50", "(2^50)", "112589990684262");
+    }
+
+}

src/test/java/org/nwapw/abacus/tests/TokenizerTests.java

@@ -4,6 +4,7 @@ import org.junit.Assert;
 import org.junit.BeforeClass;
 import org.junit.Test;
 import org.nwapw.abacus.Abacus;
+import org.nwapw.abacus.config.Configuration;
 import org.nwapw.abacus.function.Function;
 import org.nwapw.abacus.function.Operator;
 import org.nwapw.abacus.function.OperatorAssociativity;
@@ -18,7 +19,7 @@ import java.util.List;
 
 public class TokenizerTests {
 
-    private static Abacus abacus = new Abacus();
+    private static Abacus abacus = new Abacus(new Configuration("precise", new String[]{}));
     private static LexerTokenizer lexerTokenizer = new LexerTokenizer();
     private static Function subtractFunction = new Function() {
         @Override