Rescan the plugins folder.

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

@@ -1,7 +0,0 @@
-package org.nwapw.abacus.function;
-
-public enum DocumentationType {
-
-    FUNCTION
-
-}

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

@@ -7,7 +7,6 @@ import javafx.collections.FXCollections;
 import javafx.collections.ObservableList;
 import javafx.collections.transformation.FilteredList;
 import javafx.fxml.FXML;
-import javafx.scene.Node;
 import javafx.scene.control.*;
 import javafx.scene.control.cell.CheckBoxListCell;
 import javafx.scene.text.Text;
@@ -15,8 +14,6 @@ import javafx.util.Callback;
 import javafx.util.StringConverter;
 import org.nwapw.abacus.Abacus;
 import org.nwapw.abacus.config.Configuration;
-import org.nwapw.abacus.function.Documentation;
-import org.nwapw.abacus.function.DocumentationType;
 import org.nwapw.abacus.number.ComputationInterruptedException;
 import org.nwapw.abacus.number.NumberInterface;
 import org.nwapw.abacus.plugin.ClassFinder;
@@ -27,10 +24,7 @@ import org.nwapw.abacus.tree.TreeNode;
 
 import java.io.File;
 import java.io.IOException;
-import java.util.ArrayList;
-import java.util.Comparator;
 import java.util.Set;
-import java.util.stream.Collectors;
 
 
 /**
@@ -103,7 +97,7 @@ public class AbacusController implements PluginListener {
     @FXML
     private TextField computationLimitField;
     @FXML
-    private ListView<Documentation> functionListView;
+    private ListView<String> functionListView;
     @FXML
     private TextField functionListSearchField;
 
@@ -126,11 +120,11 @@ public class AbacusController implements PluginListener {
     /**
      * The list of functions that are registered in the calculator.
      */
-    private ObservableList<Documentation> functionList;
+    private ObservableList<String> functionList;
     /**
      * The filtered list displayed to the user.
      */
-    private FilteredList<Documentation> functionFilter;
+    private FilteredList<String> functionFilter;
 
     /**
      * The abacus instance used for changing the plugin configuration.
@@ -222,7 +216,7 @@ public class AbacusController implements PluginListener {
         Callback<TableColumn<HistoryModel, String>, TableCell<HistoryModel, String>> cellFactory =
                 param -> new CopyableCell<>();
         Callback<ListView<ToggleablePlugin>, ListCell<ToggleablePlugin>> pluginCellFactory =
-                param -> new CheckBoxListCell<>(ToggleablePlugin::enabledProperty, new StringConverter<ToggleablePlugin>() {
+                param -> new CheckBoxListCell<>(ToggleablePlugin::getEnabledProperty, new StringConverter<ToggleablePlugin>() {
                     @Override
                     public String toString(ToggleablePlugin object) {
                         return object.getClassName().substring(object.getClassName().lastIndexOf('.') + 1);
@@ -230,15 +224,15 @@ public class AbacusController implements PluginListener {
 
                     @Override
                     public ToggleablePlugin fromString(String string) {
-                        return new ToggleablePlugin(true, string);
+                        return new ToggleablePlugin(string, true);
                     }
                 });
+
         functionList = FXCollections.observableArrayList();
         functionFilter = new FilteredList<>(functionList, (s) -> true);
         functionListView.setItems(functionFilter);
         functionListSearchField.textProperty().addListener((observable, oldValue, newValue) ->
-                functionFilter.setPredicate((newValue.length() == 0) ? ((s) -> true) : ((s) -> s.matches(newValue))));
-        functionListView.setCellFactory(param -> new DocumentationCell());
+                functionFilter.setPredicate((newValue.length() == 0) ? ((s) -> true) : ((s) -> s.contains(newValue))));
         historyData = FXCollections.observableArrayList();
         historyTable.setItems(historyData);
         numberImplementationOptions = FXCollections.observableArrayList();
@@ -249,11 +243,11 @@ public class AbacusController implements PluginListener {
         enabledPluginView.setItems(enabledPlugins);
         enabledPluginView.setCellFactory(pluginCellFactory);
         inputColumn.setCellFactory(cellFactory);
-        inputColumn.setCellValueFactory(cell -> cell.getValue().inputProperty());
+        inputColumn.setCellValueFactory(cell -> cell.getValue().getInputProperty());
         parsedColumn.setCellFactory(cellFactory);
-        parsedColumn.setCellValueFactory(cell -> cell.getValue().parsedProperty());
+        parsedColumn.setCellValueFactory(cell -> cell.getValue().getParsedProperty());
         outputColumn.setCellFactory(cellFactory);
-        outputColumn.setCellValueFactory(cell -> cell.getValue().outputProperty());
+        outputColumn.setCellValueFactory(cell -> cell.getValue().getOutputProperty());
         coreTabPane.getSelectionModel().selectedItemProperty().addListener((observable, oldValue, newValue) -> {
             if (oldValue.equals(settingsTab)) alertIfApplyNeeded(true);
         });
@@ -261,13 +255,7 @@ public class AbacusController implements PluginListener {
         abacus = new Abacus(new Configuration(CONFIG_FILE));
         PluginManager abacusPluginManager = abacus.getPluginManager();
         abacusPluginManager.addListener(this);
-        abacusPluginManager.addInstantiated(new StandardPlugin(abacus.getPluginManager()));
-        try {
-            ClassFinder.loadJars("plugins").forEach(abacusPluginManager::addClass);
-        } catch (IOException | ClassNotFoundException e) {
-            e.printStackTrace();
-        }
-        abacusPluginManager.reload();
+        performScan();
 
         computationLimitField.setText(Double.toString(abacus.getConfiguration().getComputationDelay()));
         computationLimitField.textProperty().addListener((observable, oldValue, newValue) -> {
@@ -317,6 +305,19 @@ public class AbacusController implements PluginListener {
         reloadAlertShown = false;
     }
 
+    @FXML
+    public void performScan(){
+        PluginManager abacusPluginManager = abacus.getPluginManager();
+        abacusPluginManager.removeAll();
+        abacusPluginManager.addInstantiated(new StandardPlugin(abacus.getPluginManager()));
+        try {
+            ClassFinder.loadJars("plugins").forEach(abacusPluginManager::addClass);
+        } catch (IOException | ClassNotFoundException e) {
+            e.printStackTrace();
+        }
+        abacusPluginManager.reload();
+    }
+
     @FXML
     public void performReload() {
         alertIfApplyNeeded(true);
@@ -349,14 +350,12 @@ public class AbacusController implements PluginListener {
         numberImplementationBox.getSelectionModel().select(toSelect);
         for (Class<?> pluginClass : abacus.getPluginManager().getLoadedPluginClasses()) {
             String fullName = pluginClass.getName();
-            ToggleablePlugin plugin = new ToggleablePlugin(!disabledPlugins.contains(fullName), fullName);
-            plugin.enabledProperty().addListener(e -> changesMade = true);
+            ToggleablePlugin plugin = new ToggleablePlugin(fullName, !disabledPlugins.contains(fullName));
+            plugin.getEnabledProperty().addListener(e -> changesMade = true);
             enabledPlugins.add(plugin);
         }
-        PluginManager pluginManager = abacus.getPluginManager();
-        functionList.addAll(manager.getAllFunctions().stream().map(name -> pluginManager.documentationFor(name, DocumentationType.FUNCTION))
-                .collect(Collectors.toCollection(ArrayList::new)));
-        functionList.sort(Comparator.comparing(Documentation::getCodeName));
+        functionList.addAll(manager.getAllFunctions());
+        functionList.sort(String::compareTo);
     }
 
     @Override

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

@@ -1,58 +0,0 @@
-package org.nwapw.abacus.fx;
-
-import javafx.scene.control.Label;
-import javafx.scene.control.ListCell;
-import javafx.scene.control.TitledPane;
-import javafx.scene.layout.VBox;
-import org.nwapw.abacus.function.Documentation;
-
-public class DocumentationCell extends ListCell<Documentation> {
-
-    private Label codeNameLabel;
-    private Label nameLabel;
-    private Label description;
-    private Label longDescription;
-    private TitledPane titledPane;
-
-    public DocumentationCell(){
-        VBox vbox = new VBox();
-        vbox.setSpacing(10);
-        titledPane = new TitledPane();
-        codeNameLabel = new Label();
-        nameLabel = new Label();
-        description = new Label();
-        longDescription = new Label();
-        codeNameLabel.setWrapText(true);
-        nameLabel.setWrapText(true);
-        description.setWrapText(true);
-        longDescription.setWrapText(true);
-        vbox.getChildren().add(codeNameLabel);
-        vbox.getChildren().add(nameLabel);
-        vbox.getChildren().add(description);
-        vbox.getChildren().add(longDescription);
-        titledPane.textProperty().bindBidirectional(codeNameLabel.textProperty());
-        titledPane.setContent(vbox);
-        titledPane.setExpanded(false);
-        titledPane.prefWidthProperty().bind(widthProperty());
-
-        visibleProperty().addListener((a, b, c) -> titledPane.setExpanded(false));
-    }
-
-    @Override
-    protected void updateItem(Documentation item, boolean empty) {
-        super.updateItem(item, empty);
-        if(empty){
-            codeNameLabel.setText("");
-            nameLabel.setText("");
-            description.setText("");
-            longDescription.setText("");
-            setGraphic(null);
-        } else {
-            codeNameLabel.setText(item.getCodeName());
-            nameLabel.setText(item.getName());
-            description.setText(item.getDescription());
-            longDescription.setText(item.getLongDescription());
-            setGraphic(titledPane);
-        }
-    }
-}

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

@@ -1,97 +0,0 @@
-package org.nwapw.abacus.fx;
-
-import javafx.beans.property.SimpleStringProperty;
-import javafx.beans.property.StringProperty;
-
-/**
- * The data model used for storing history entries.
- */
-public class HistoryModel {
-
-    /**
-     * The property used for displaying the column
-     * for the user input.
-     */
-    private final StringProperty input;
-    /**
-     * The property used for displaying the column
-     * that contains the parsed input.
-     */
-    private final StringProperty parsed;
-    /**
-     * The property used for displaying the column
-     * that contains the program output.
-     */
-    private final StringProperty output;
-
-    /**
-     * Creates a new history model with the given variables.
-     *
-     * @param input  the user input
-     * @param parsed the parsed input
-     * @param output the program output.
-     */
-    public HistoryModel(String input, String parsed, String output) {
-        this.input = new SimpleStringProperty();
-        this.parsed = new SimpleStringProperty();
-        this.output = new SimpleStringProperty();
-        this.input.setValue(input);
-        this.parsed.setValue(parsed);
-        this.output.setValue(output);
-    }
-
-    /**
-     * Gets the input property.
-     *
-     * @return the input property.
-     */
-    public StringProperty inputProperty() {
-        return input;
-    }
-
-    /**
-     * Gets the input.
-     *
-     * @return the input.
-     */
-    public String getInput() {
-        return input.get();
-    }
-
-    /**
-     * 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() {
-        return parsed.get();
-    }
-
-    /**
-     * Gets the output property.
-     *
-     * @return the output property.
-     */
-    public StringProperty outputProperty() {
-        return output;
-    }
-
-    /**
-     * Gets the program output.
-     *
-     * @return the output.
-     */
-    public String getOutput() {
-        return output.get();
-    }
-
-}

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

@@ -1,60 +0,0 @@
-package org.nwapw.abacus.fx;
-
-import javafx.beans.property.BooleanProperty;
-import javafx.beans.property.SimpleBooleanProperty;
-
-/**
- * Class that represents an entry in the plugin check box list.
- * The changes from this property are written to the config on application.
- */
-public class ToggleablePlugin {
-
-    /**
-     * The property that determines whether the plugin will be enabled.
-     */
-    private final BooleanProperty enabled;
-    /**
-     * The name of the class this entry toggles.
-     */
-    private final String className;
-
-    /**
-     * 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.
-     */
-    public ToggleablePlugin(boolean enabled, String className) {
-        this.enabled = new SimpleBooleanProperty();
-        this.enabled.setValue(enabled);
-        this.className = className;
-    }
-
-    /**
-     * Gets the enabled property of this plugin.
-     *
-     * @return the enabled property.
-     */
-    public BooleanProperty enabledProperty() {
-        return enabled;
-    }
-
-    /**
-     * Checks if this plugin entry should be enabled.
-     *
-     * @return whether this plugin will be enabled.
-     */
-    public boolean isEnabled() {
-        return enabled.get();
-    }
-
-    /**
-     * Gets the class name this plugin toggles.
-     *
-     * @return the class name that should be disabled.
-     */
-    public String getClassName() {
-        return className;
-    }
-
-}

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

@@ -128,5 +128,9 @@ public class NaiveNumber extends NumberInterface {
         return Double.toString(Math.round(value * shiftBy) / shiftBy);
     }
 
+    @Override
+    public NumberInterface getMaxError(){
+        return new NaiveNumber(Math.pow(10, -18));
+    }
 }
 

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

@@ -240,6 +240,7 @@ public abstract class NumberInterface {
      * @param toClass the class to promote to.
      * @return the resulting new instance.
      */
+    @Deprecated
     protected abstract NumberInterface promoteToInternal(Class<? extends NumberInterface> toClass);
 
     /**
@@ -250,9 +251,17 @@ public abstract class NumberInterface {
      * @param toClass the class to promote to.
      * @return the resulting new instance.
      */
+    @Deprecated
     public final NumberInterface promoteTo(Class<? extends NumberInterface> toClass) {
         checkInterrupted();
         return promoteToInternal(toClass);
     }
 
+    /**
+     * Returns the smallest error this instance can tolerate depending
+     * on its precision and value.
+     * @return the smallest error that should be permitted in calculations.
+     */
+    public abstract NumberInterface getMaxError();
+
 }

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

@@ -1,7 +1,7 @@
 package org.nwapw.abacus.number;
 
 import java.math.BigDecimal;
-import java.math.RoundingMode;
+import java.math.MathContext;
 
 /**
  * A number that uses a BigDecimal to store its value,
@@ -22,6 +22,21 @@ public class PreciseNumber extends NumberInterface {
      */
     public static final PreciseNumber TEN = new PreciseNumber(BigDecimal.TEN);
 
+    /**
+     * The number of extra significant figures kept in calculations before rounding for output.
+     */
+    private static int numExtraInternalSigFigs = 15;
+
+    /**
+     * MathContext that is used when rounding a number prior to output.
+     */
+    private static MathContext outputContext = new MathContext(50);
+
+    /**
+     * MathContext that is actually used in calculations.
+     */
+    private static MathContext internalContext = new MathContext(outputContext.getPrecision()+numExtraInternalSigFigs);
+
     /**
      * The value of the PreciseNumber.
      */
@@ -48,7 +63,7 @@ public class PreciseNumber extends NumberInterface {
 
     @Override
     public int getMaxPrecision() {
-        return 65;
+        return internalContext.getPrecision();
     }
 
     @Override
@@ -58,7 +73,7 @@ public class PreciseNumber extends NumberInterface {
 
     @Override
     public NumberInterface divideInternal(NumberInterface divisor) {
-        return new PreciseNumber(value.divide(((PreciseNumber) divisor).value, this.getMaxPrecision(), RoundingMode.HALF_UP));
+        return new PreciseNumber(value.divide(((PreciseNumber) divisor).value, internalContext));
     }
 
     @Override
@@ -147,7 +162,11 @@ public class PreciseNumber extends NumberInterface {
 
     @Override
     public String toString() {
-        BigDecimal rounded = value.setScale(getMaxPrecision() - 15, RoundingMode.HALF_UP);
-        return rounded.stripTrailingZeros().toPlainString();
+        return value.round(outputContext).toString();
+    }
+
+    @Override
+    public NumberInterface getMaxError(){
+        return new PreciseNumber(value.ulp()).multiplyInternal(TEN.intPowInternal(value.precision()-internalContext.getPrecision()));
     }
 }

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

@@ -14,7 +14,7 @@ public abstract class NumberImplementation {
     /**
      * The list of paths through which this implementation can be promoted.
      */
-    protected Map<Class<? extends NumberInterface>, Function<NumberInterface, NumberInterface>> promotionPaths;
+    private Map<Class<? extends NumberInterface>, Function<NumberInterface, NumberInterface>> promotionPaths;
     /**
      * The implementation class for this implementation.
      */

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

@@ -1,7 +1,5 @@
 package org.nwapw.abacus.plugin;
 
-import org.nwapw.abacus.function.Documentation;
-import org.nwapw.abacus.function.DocumentationType;
 import org.nwapw.abacus.function.Function;
 import org.nwapw.abacus.function.Operator;
 import org.nwapw.abacus.number.NumberInterface;
@@ -96,15 +94,6 @@ public abstract class Plugin {
         manager.registerNumberImplementation(name, implementation);
     }
 
-    /**
-     * To be used in load(). Registers a documentation instance
-     * used to explain some element of the plugin to the user.
-     * @param documentation the documentation instance.
-     */
-    protected final void registerDocumentation(Documentation documentation){
-        manager.registerDocumentation(documentation);
-    }
-
     /**
      * Searches the PluginManager for the given function name.
      * This can be used by the plugins internally in order to call functions
@@ -141,17 +130,6 @@ public abstract class Plugin {
         return manager.numberImplementationFor(name);
     }
 
-    /**
-     * Searches the PluginManager for the given documentation name and type.
-     *
-     * @param name the name for which to search.
-     * @param type the type of documentation to search for.
-     * @return the found documentation, or null if none was found.
-     */
-    protected final Documentation documentationFor(String name, DocumentationType type){
-        return manager.documentationFor(name, type);
-    }
-
     /**
      * Searches the plugin manager for a Pi value for the given number implementation.
      * This is done so that number implementations with various degrees of precision

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

@@ -1,8 +1,6 @@
 package org.nwapw.abacus.plugin;
 
 import org.nwapw.abacus.Abacus;
-import org.nwapw.abacus.function.Documentation;
-import org.nwapw.abacus.function.DocumentationType;
 import org.nwapw.abacus.function.Function;
 import org.nwapw.abacus.function.Operator;
 import org.nwapw.abacus.number.NumberInterface;
@@ -36,10 +34,6 @@ public class PluginManager {
      * The map of number implementations registered by the plugins.
      */
     private Map<String, NumberImplementation> registeredNumberImplementations;
-    /**
-     * The map of documentation for functions registered by the plugins.
-     */
-    private Set<Documentation> registeredDocumentation;
     /**
      * The list of number implementations that have been
      * found by their implementation class.
@@ -71,7 +65,6 @@ public class PluginManager {
         registeredFunctions = new HashMap<>();
         registeredOperators = new HashMap<>();
         registeredNumberImplementations = new HashMap<>();
-        registeredDocumentation = new HashSet<>();
         cachedInterfaceImplementations = new HashMap<>();
         cachedPi = new HashMap<>();
         listeners = new HashSet<>();
@@ -104,15 +97,6 @@ public class PluginManager {
         registeredNumberImplementations.put(name, implementation);
     }
 
-    /**
-     * Registers the given documentation with the plugin manager,
-     * making it accessible to the plugin manager etc.
-     * @param documentation the documentation to register.
-     */
-    public void registerDocumentation(Documentation documentation){
-        registeredDocumentation.add(documentation);
-    }
-
     /**
      * Gets the function registered under the given name.
      * @param name the name of the function.
@@ -140,27 +124,6 @@ public class PluginManager {
         return registeredNumberImplementations.get(name);
     }
 
-    /**
-     * Gets the documentation for the given entity of the given type.
-     * @param name the name of the entity to search for.
-     * @param type the type that this entity is, to filter out similarly named documentation.
-     * @return the documentation object.
-     */
-    public Documentation documentationFor(String name, DocumentationType type){
-        Documentation toReturn = null;
-        for(Documentation entry : registeredDocumentation){
-            if(entry.getCodeName().equals(name) && entry.getType() == type) {
-                toReturn = entry;
-                break;
-            }
-        }
-        if(toReturn == null){
-            toReturn = new Documentation(name, "", "", "", type);
-            registerDocumentation(toReturn);
-        }
-        return toReturn;
-    }
-
     /**
      * Gets the number implementation for the given implementation class.
      *
@@ -224,6 +187,24 @@ public class PluginManager {
         }
     }
 
+    /**
+     * Removes the plugin with the given class from the manager.
+     * @param toRemove the plugin to remove.
+     */
+    public void removeClass(Class<? extends Plugin> toRemove){
+        if(!loadedPluginClasses.contains(toRemove)) return;
+        plugins.removeIf(plugin -> plugin.getClass() == toRemove);
+        loadedPluginClasses.remove(toRemove);
+    }
+
+    /**
+     * Removes all plugins from this plugin manager.
+     */
+    public void removeAll(){
+        loadedPluginClasses.clear();
+        plugins.clear();
+    }
+
     /**
      * Loads all the plugins in the PluginManager.
      */
@@ -249,7 +230,6 @@ public class PluginManager {
         registeredFunctions.clear();
         registeredOperators.clear();
         registeredNumberImplementations.clear();
-        registeredDocumentation.clear();
         cachedInterfaceImplementations.clear();
         cachedPi.clear();
         listeners.forEach(e -> e.onUnload(this));

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

@@ -1,18 +1,15 @@
 package org.nwapw.abacus.plugin;
 
-import org.nwapw.abacus.function.*;
-import org.nwapw.abacus.lexing.pattern.Match;
+import org.nwapw.abacus.function.Function;
+import org.nwapw.abacus.function.Operator;
+import org.nwapw.abacus.function.OperatorAssociativity;
+import org.nwapw.abacus.function.OperatorType;
 import org.nwapw.abacus.number.NaiveNumber;
 import org.nwapw.abacus.number.NumberInterface;
 import org.nwapw.abacus.number.PreciseNumber;
-import org.nwapw.abacus.parsing.Parser;
-import org.nwapw.abacus.parsing.ShuntingYardParser;
-import org.nwapw.abacus.tree.TokenType;
-import org.nwapw.abacus.tree.TreeNode;
 
 import java.util.ArrayList;
 import java.util.HashMap;
-import java.util.List;
 import java.util.function.BiFunction;
 
 /**
@@ -191,7 +188,7 @@ public class StandardPlugin extends Plugin {
          */
         private NumberInterface getLogPartialSum(NumberInterface x) {
 
-            NumberInterface maxError = getMaxError(x);
+            NumberInterface maxError = x.getMaxError();
             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;
@@ -210,7 +207,7 @@ public class StandardPlugin extends Plugin {
          * @return the value of log(2) with the appropriate precision.
          */
         private NumberInterface getLog2(NumberInterface number) {
-            NumberInterface maxError = getMaxError(number);
+            NumberInterface maxError = number.getMaxError();
             //NumberInterface errorBound = fromInt(number.getClass(), 1);
             //We'll use the series \sigma_{n >= 1) ((1/3^n + 1/4^n) * 1/n)
             //In the following, a=1/3^n, b=1/4^n, c = 1/n.
@@ -304,16 +301,11 @@ public class StandardPlugin extends Plugin {
 
         @Override
         protected NumberInterface applyInternal(NumberInterface[] params) {
-            NumberInterface maxError = getMaxError(params[0]);
+            NumberInterface maxError = params[0].getMaxError();
             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;
+            if (params[0].signum() < 0) {
+                NumberInterface[] negatedParams = {params[0].negate()};
+               return fromInt(params[0].getClass(), 1).divide(applyInternal(negatedParams));
             } 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.
@@ -355,7 +347,7 @@ public class StandardPlugin extends Plugin {
                 return NaiveNumber.ONE.promoteTo(params[1].getClass());
             //Detect integer bases:
             if(params[0].fractionalPart().compareTo(fromInt(params[0].getClass(), 0)) == 0
-                    && FUNCTION_ABS.apply(params[0]).compareTo(fromInt(params[0].getClass(), Integer.MAX_VALUE)) < 0
+                    && FUNCTION_ABS.apply(params[1]).compareTo(fromInt(params[0].getClass(), Integer.MAX_VALUE)) < 0
                     && FUNCTION_ABS.apply(params[1]).compareTo(fromInt(params[1].getClass(), 1)) >= 0){
                 NumberInterface[] newParams = {params[0], params[1].fractionalPart()};
                 return params[0].intPow(params[1].floor().intValue()).multiply(applyInternal(newParams));
@@ -479,16 +471,6 @@ public class StandardPlugin extends Plugin {
         return sum;
     }
 
-    /**
-     * Returns the maximum error based on the precision of the class of number.
-     *
-     * @param number Any instance of the NumberInterface in question (should return an appropriate precision).
-     * @return the maximum error.
-     */
-    private static NumberInterface getMaxError(NumberInterface number) {
-        return fromInt(number.getClass(), 10).intPow(-number.getMaxPrecision());
-    }
-
     /**
      * A factorial function that uses memoization for each number class; it efficiently
      * computes factorials of non-negative integers.
@@ -520,7 +502,7 @@ public class StandardPlugin extends Plugin {
      */
     private static NumberInterface sinTaylor(NumberInterface x) {
         NumberInterface power = x, multiplier = x.multiply(x).negate(), currentTerm = x, sum = x;
-        NumberInterface maxError = getMaxError(x);
+        NumberInterface maxError = x.getMaxError();
         int n = 1;
         do {
             n += 2;
@@ -586,35 +568,6 @@ public class StandardPlugin extends Plugin {
         registerFunction("sec", functionSec);
         registerFunction("csc", functionCsc);
         registerFunction("cot", functionCot);
-
-        registerDocumentation(new Documentation("abs", "Absolute Value", "Finds the distance " +
-                "from zero of a number.", "Given a number, this function finds the distance form " +
-                "zero of a number, effectively turning negative numbers into positive ones.\n\n" +
-                "Example: abs(-2) -> 2", DocumentationType.FUNCTION));
-        registerDocumentation(new Documentation("exp", "Exponentiate", "Brings e to the given power.",
-                "This function evaluates e to the power of the given value, and is the inverse " +
-                        "of the natural logarithm.\n\n" +
-                        "Example: exp(1) -> 2.718...", DocumentationType.FUNCTION));
-        registerDocumentation(new Documentation("ln", "Natural Logarithm", "Gets the natural " +
-                "logarithm of the given value.", "The natural logarithm of a number is " +
-                "the power that e has to be brought to to be equal to the number.\n\n" +
-                "Example: ln(2.718) -> 1", DocumentationType.FUNCTION));
-        registerDocumentation(new Documentation("sqrt", "Square Root", "Finds the square root " +
-                "of the number.", "A square root a of a number is defined such that a times a is equal " +
-                "to that number.\n\n" +
-                "Example: sqrt(4) -> 2", DocumentationType.FUNCTION));
-        registerDocumentation(new Documentation("sin", "Sine", "Computes the sine of the given angle, " +
-                "in radians.", "", DocumentationType.FUNCTION));
-        registerDocumentation(new Documentation("cos", "Cosine", "Computes the cosine of the given angle, " +
-                "in radians.", "", DocumentationType.FUNCTION));
-        registerDocumentation(new Documentation("tan", "Tangent", "Computes the tangent of the given angle, " +
-                "in radians.", "", DocumentationType.FUNCTION));
-        registerDocumentation(new Documentation("sec", "Secant", "Computes the secant of the given angle, " +
-                "in radians.", "", DocumentationType.FUNCTION));
-        registerDocumentation(new Documentation("csc", "Cosecant", "Computes the cosecant of the given angle, " +
-                "in radians.", "", DocumentationType.FUNCTION));
-        registerDocumentation(new Documentation("cot", "Cotangent", "Computes the cotangent of the given angle, " +
-                "in radians.", "", DocumentationType.FUNCTION));
     }
 
     @Override

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

@@ -1,19 +0,0 @@
-package org.nwapw.abacus.tree;
-
-/**
- * Interface used to reduce a tree into a single value.
- *
- * @param <T> the value to reduce into.
- */
-public interface Reducer<T> {
-
-    /**
-     * Reduces the given tree into a single value of type T.
-     *
-     * @param node     the node being passed in to be reduced.
-     * @param children the already-reduced children of this node.
-     * @return the resulting value from the reduce.
-     */
-    public T reduceNode(TreeNode node, Object... children);
-
-}

src/main/kotlin/org/nwapw/abacus/function/Documentation.kt

@@ -1,26 +0,0 @@
-package org.nwapw.abacus.function
-
-/**
- * A data class used for storing information about a function.
- *
- * The Documentation class holds the information necessary to display the information
- * about a function to the user.
- *
- * @param codeName the name of the function as it occurs in code.
- * @param name the name of the function in English.
- * @param description the short description of this function.
- * @param longDescription the full description of this function.
- * @param type the things this documentation maps to.
- */
-data class Documentation(val codeName: String, val name: String,
-                         val description: String, val longDescription: String,
-                         val type: DocumentationType) {
-
-    fun matches(other: String): Boolean {
-        return codeName.toLowerCase().contains(other.toLowerCase()) ||
-                name.toLowerCase().contains(other.toLowerCase()) ||
-                description.toLowerCase().contains(other.toLowerCase()) ||
-                longDescription.toLowerCase().contains(other.toLowerCase())
-    }
-
-}

src/main/kotlin/org/nwapw/abacus/fx/HistoryModel.kt

@@ -0,0 +1,32 @@
+package org.nwapw.abacus.fx
+
+import javafx.beans.property.SimpleStringProperty
+
+/**
+ * A model representing an input / output in the calculator.
+ *
+ * The HistoryModel class stores a record of a single user-provided input,
+ * its parsed form as it was interpreted by the calculator, and the output
+ * that was provided by the calculator. These are represented as properties
+ * to allow easy access by JavaFX cells.
+ *
+ * @param input the user input
+ * @param parsed the parsed version of the input.
+ * @param output the output string.
+ */
+class HistoryModel(input: String, parsed: String, output: String){
+
+    /**
+     * The property that holds the input.
+     */
+    val inputProperty = SimpleStringProperty(input)
+    /**
+     * The property that holds the parsed input.
+     */
+    val parsedProperty = SimpleStringProperty(parsed)
+    /**
+     * The property that holds the output.
+     */
+    val outputProperty = SimpleStringProperty(output)
+
+}

src/main/kotlin/org/nwapw/abacus/fx/ToggleablePlugin.kt

@@ -0,0 +1,31 @@
+package org.nwapw.abacus.fx
+
+import javafx.beans.property.SimpleBooleanProperty
+
+/**
+ * A model representing a plugin that can be disabled or enabled.
+ *
+ * ToggleablePlugin is a model that is used to present to the user the option
+ * of disabling / enabling plugins. The class name in this plugin is stored if
+ * its "enabledPropery" is false, essentially blacklisting the plugin.
+ *
+ * @param className the name of the class that this model concerns.
+ * @param enabled whether or not the model should start enabled.
+ */
+class ToggleablePlugin (val className: String, enabled: Boolean) {
+
+    /**
+     * The property used to interact with JavaFX components.
+     */
+    val enabledProperty = SimpleBooleanProperty(enabled)
+
+    /**
+     * Checks whether this plugin is currently enabled or not.
+     *
+     * @return true if it is enabled, false otherwise.
+     */
+    fun isEnabled(): Boolean {
+        return enabledProperty.value
+    }
+
+}

src/main/kotlin/org/nwapw/abacus/tree/FunctionNode.kt

@@ -16,7 +16,7 @@ data class FunctionNode(val function: String) : TreeNode() {
     val children: MutableList<TreeNode> = mutableListOf()
 
     override fun <T : Any> reduce(reducer: Reducer<T>): T? {
-        val children = Array<Any?>(children.size, { children[it].reduce(reducer) ?: return null; })
+        val children = Array<Any>(children.size, { children[it].reduce(reducer) ?: return null; })
         return reducer.reduceNode(this, *children)
     }
 

src/main/kotlin/org/nwapw/abacus/tree/Reducer.kt

@@ -0,0 +1,19 @@
+package org.nwapw.abacus.tree
+
+/**
+ * Reducer interface that takes a tree and returns a single value.
+ *
+ * The reducer walks the tree, visiting the children first, converting them into
+ * a value, and then attempts to reduce the parent. Eventually, the single final value is returned.
+ */
+interface Reducer <out T> {
+
+    /**
+     * Reduces the given tree node, given its already reduced children.
+     *
+     * @param treeNode the tree node to reduce.
+     * @param children the list of children, of type T.
+     */
+    fun reduceNode(treeNode: TreeNode, vararg children: Any) : T?
+
+}

src/main/resources/abacus.fxml

@@ -57,6 +57,7 @@
                         <Button text="Apply" onAction="#performSave"/>
                         <Button text="Reload Plugins" onAction="#performReload"/>
                         <Button text="Apply and Reload" onAction="#performSaveAndReload"/>
+                        <Button text="Scan Plugins" onAction="#performScan"/>
                     </FlowPane>
                 </GridPane>
             </Tab>

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

@@ -88,8 +88,8 @@ public class CalculationTests {
     public void testExp(){
         testOutput("exp0", "exp(0)", "1");
         testOutput("exp1", "exp(1)", "2.718281828459045235360287471352662497757247");
-        testOutput("exp300", "exp(300)", "19424263952412559365842088360176992193662086");
-        testOutput("exp300", "exp(300)", "19424263952412559365842088360176992193662086");
+        testOutput("exp300", "exp(300)", "1.9424263952412559365842088360176992193662086");
+        testOutput("exp(-500)", "exp((500)`)", "7.1245764067412855315491573771227552469277568");
     }
 
     @Test
@@ -99,6 +99,9 @@ public class CalculationTests {
         testOutput("2^1", "(2^1)", "2");
         testOutput("2^-1", "(2^(1)`)", "0.5");
         testOutput("2^50", "(2^50)", "112589990684262");
+        testOutput("7^(-sqrt2*17)", "(7^((sqrt(2)*17))`)", "4.81354609155297814551845300063563");
+        testEvalError("0^0", "(0^0)");
+        testEvalError("(-13)^.9999", "((13)`^0.9999)");
     }
 
 }