Add a save and reload button.

[ci skip]

.travis.yml

@@ -0,0 +1 @@
+language: java

README.md

@@ -1,12 +1,14 @@
 # abacus
+[![Build Status](https://travis-ci.org/DanilaFe/abacus.svg?branch=master)](https://travis-ci.org/DanilaFe/abacus)
+
 Summer project for NWAPW.
 Created by Arthur Drobot, Danila Fedorin and Riley Jones.
 
 ## Project Description
-Abacus is a calculator built with extensibility and usability in mind. It provides a plugin interface, via Java, as Lua provides too difficult to link up to the Java core. The description of the internals of the project can be found on the wiki page.
+Abacus is a calculator built with extensibility and usability in mind. It provides a plugin interface, via Java, as Lua proves too difficult to link up to the Java core. The description of the internals of the project can be found on the wiki page.
 
 ## Current State
-Abacus is being built for the Northwest Advanced Programming Workshop, a 3 week program in which students work in treams to complete a single project, following principles of agile development. Because of its short timeframe, Abacus is not even close to completed state. Below is a list of the current features and problems.
+Abacus is being built for the Northwest Advanced Programming Workshop, a 3 week program in which students work in teams to complete a single project, following principles of agile development. Because of its short timeframe, Abacus is not even close to completed state. Below is a list of the current features and problems.
 - [x] Basic number class
 - [x] Implementation of basic functions 
 - [x] Implementation of `exp`, `ln`, `sqrt` using the basic functions and Taylor Series

build.gradle

@@ -1,14 +1,6 @@
 apply plugin: 'java'
 apply plugin: 'application'
 
-sourceSets {
-  main {
-    java {
-      srcDirs = ['src']
-    }
-  }
-}
-
 repositories {
   mavenCentral()
 }

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

@@ -1,6 +1,7 @@
 package org.nwapw.abacus;
 
-import org.nwapw.abacus.config.ConfigurationObject;
+import org.nwapw.abacus.config.Configuration;
+import org.nwapw.abacus.fx.AbacusApplication;
 import org.nwapw.abacus.number.NaiveNumber;
 import org.nwapw.abacus.number.NumberInterface;
 import org.nwapw.abacus.parsing.LexerTokenizer;
@@ -11,9 +12,7 @@ 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 org.nwapw.abacus.window.Window;
 
-import javax.swing.*;
 import java.io.File;
 import java.io.IOException;
 import java.lang.reflect.InvocationTargetException;
@@ -34,10 +33,6 @@ public class Abacus {
      */
     public static final File CONFIG_FILE = new File("config.toml");
 
-    /**
-     * The main Abacus UI.
-     */
-    private Window mainUi;
     /**
      * The plugin manager responsible for
      * loading and unloading plugins,
@@ -51,7 +46,7 @@ public class Abacus {
     /**
      * The configuration loaded from a file.
      */
-    private ConfigurationObject configuration;
+    private Configuration configuration;
     /**
      * The tree builder used to construct a tree
      * from a string.
@@ -63,10 +58,9 @@ public class Abacus {
      */
     public Abacus() {
         pluginManager = new PluginManager(this);
-        mainUi = new Window(this);
         numberReducer = new NumberReducer(this);
-        configuration = new ConfigurationObject(CONFIG_FILE);
+        configuration = new Configuration(CONFIG_FILE);
-        configuration.save(CONFIG_FILE);
+        configuration.saveTo(CONFIG_FILE);
         LexerTokenizer lexerTokenizer = new LexerTokenizer();
         ShuntingYardParser shuntingYardParser = new ShuntingYardParser(this);
         treeBuilder = new TreeBuilder<>(lexerTokenizer, shuntingYardParser);
@@ -81,12 +75,15 @@ public class Abacus {
             e.printStackTrace();
         }
         pluginManager.load();
+    }
 
-        mainUi.setVisible(true);
+    public static void main(String[] args) {
+        AbacusApplication.launch(AbacusApplication.class, args);
     }
 
     /**
      * Gets the current tree builder.
+     *
      * @return the main tree builder in this abacus instance.
      */
     public TreeBuilder getTreeBuilder() {
@@ -95,23 +92,17 @@ public class Abacus {
 
     /**
      * Gets the current plugin manager,
+     *
      * @return the plugin manager in this abacus instance.
      */
     public PluginManager getPluginManager() {
         return pluginManager;
     }
 
-    /**
-     * Gets the current UI.
-     * @return the UI window in this abacus instance.
-     */
-    public Window getMainUi() {
-        return mainUi;
-    }
-
     /**
      * Get the reducer that is responsible for transforming
      * an expression into a number.
+     *
      * @return the number reducer in this abacus instance.
      */
     public NumberReducer getNumberReducer() {
@@ -120,15 +111,17 @@ public class Abacus {
 
     /**
      * Gets the configuration object associated with this instance.
+     *
      * @return the configuration object.
      */
-    public ConfigurationObject getConfiguration() {
+    public Configuration getConfiguration() {
         return configuration;
     }
 
     /**
      * Parses a string into a tree structure using the main
      * tree builder.
+     *
      * @param input the input string to parse
      * @return the resulting tree, null if the tree builder or the produced tree are null.
      */
@@ -139,6 +132,7 @@ public class Abacus {
     /**
      * Evaluates the given tree using the main
      * number reducer.
+     *
      * @param tree the tree to reduce, must not be null.
      * @return the resulting number, or null of the reduction failed.
      */
@@ -146,6 +140,12 @@ public class Abacus {
         return tree.reduce(numberReducer);
     }
 
+    /**
+     * Creates a number from a string.
+     *
+     * @param numberString the string to create the number from.
+     * @return the resulting number.
+     */
     public NumberInterface numberFromString(String numberString) {
         Class<? extends NumberInterface> toInstantiate =
                 pluginManager.numberFor(configuration.getNumberImplementation());
@@ -158,14 +158,4 @@ public class Abacus {
         }
         return null;
     }
-
-    public static void main(String[] args){
-        try {
-            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
-        } catch (ClassNotFoundException | InstantiationException | UnsupportedLookAndFeelException | IllegalAccessException e) {
-            e.printStackTrace();
-        }
-
-        new Abacus();
-    }
 }

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

@@ -0,0 +1,108 @@
+package org.nwapw.abacus.config;
+
+import com.moandjiezana.toml.Toml;
+import com.moandjiezana.toml.TomlWriter;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.Set;
+
+/**
+ * The configuration object that stores
+ * options that the user can change.
+ */
+public class Configuration {
+
+    /**
+     * The defaults TOML string.
+     */
+    private static final String DEFAULT_CONFIG =
+            "numberImplementation = \"naive\"\n" +
+            "disabledPlugins = []";
+    /**
+     * The defaults TOML object, parsed from the string.
+     */
+    private static final Toml DEFAULT_TOML = new Toml().read(DEFAULT_CONFIG);
+    /**
+     * The TOML writer used to write this configuration to a file.
+     */
+    private static final TomlWriter TOML_WRITER = new TomlWriter();
+
+    /**
+     * The implementation of the number that should be used.
+     */
+    private String numberImplementation = "<default>";
+    /**
+     * The list of disabled plugins in this Configuration.
+     */
+    private Set<String> disabledPlugins = new HashSet<>();
+
+    /**
+     * Creates a new configuration with the given values.
+     * @param numberImplementation the number implementation, like "naive" or "precise"
+     * @param disabledPlugins the list of disabled plugins.
+     */
+    public Configuration(String numberImplementation, String[] disabledPlugins){
+        this.numberImplementation = numberImplementation;
+        this.disabledPlugins.addAll(Arrays.asList(disabledPlugins));
+    }
+
+    /**
+     * Loads a configuration from a given file, keeping non-specified fields default.
+     * @param fromFile the file to load from.
+     */
+    public Configuration(File fromFile){
+        if(!fromFile.exists()) return;
+        copyFrom(new Toml(DEFAULT_TOML).read(fromFile).to(Configuration.class));
+    }
+
+    /**
+     * Copies the values from the given configuration into this one.
+     * @param otherConfiguration the configuration to copy from.
+     */
+    public void copyFrom(Configuration otherConfiguration){
+        this.numberImplementation = otherConfiguration.numberImplementation;
+        this.disabledPlugins.addAll(otherConfiguration.disabledPlugins);
+    }
+
+    /**
+     * 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){
+        if(file.getParentFile() != null) file.getParentFile().mkdirs();
+        try {
+            TOML_WRITER.write(this, file);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    /**
+     * Gets the number implementation from this configuration.
+     * @return the number implementation.
+     */
+    public String getNumberImplementation() {
+        return numberImplementation;
+    }
+
+    /**
+     * Sets the number implementation for the configuration
+     * @param numberImplementation the number implementation.
+     */
+    public void setNumberImplementation(String numberImplementation) {
+        this.numberImplementation = numberImplementation;
+    }
+
+    /**
+     * Gets the list of disabled plugins.
+     * @return the list of disabled plugins.
+     */
+    public Set<String> getDisabledPlugins() {
+        return disabledPlugins;
+    }
+
+}

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

@@ -23,6 +23,7 @@ public abstract class Function {
 
     /**
      * Checks whether the given params will work for the given function.
+     *
      * @param params the given params
      * @return true if the params can be used with this function.
      */
@@ -31,6 +32,7 @@ public abstract class Function {
     /**
      * Internal apply implementation, which already receives appropriately promoted
      * parameters that have bee run through matchesParams
+     *
      * @param params the promoted parameters.
      * @return the return value of the function.
      */
@@ -38,6 +40,7 @@ public abstract class Function {
 
     /**
      * Function to check, promote arguments and run the function.
+     *
      * @param params the raw input parameters.
      * @return the return value of the function, or null if an error occurred.
      */

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

@@ -24,6 +24,7 @@ public class Operator {
 
     /**
      * Creates a new operator with the given parameters.
+     *
      * @param associativity the associativity of the operator.
      * @param precedence    the precedence of the operator.
      * @param function      the function that the operator calls.
@@ -37,6 +38,7 @@ public class Operator {
 
     /**
      * Gets the operator's associativity.
+     *
      * @return the associativity.
      */
     public OperatorAssociativity getAssociativity() {
@@ -45,6 +47,7 @@ public class Operator {
 
     /**
      * Gets the operator's type.
+     *
      * @return the type.
      */
     public OperatorType getType() {
@@ -53,6 +56,7 @@ public class Operator {
 
     /**
      * Gets the operator's precedence.
+     *
      * @return the precedence.
      */
     public int getPrecedence() {
@@ -61,6 +65,7 @@ public class Operator {
 
     /**
      * Gets the operator's function.
+     *
      * @return the function.
      */
     public Function getFunction() {

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

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

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

@@ -0,0 +1,24 @@
+package org.nwapw.abacus.fx;
+
+import javafx.application.Application;
+import javafx.fxml.FXMLLoader;
+import javafx.scene.Parent;
+import javafx.scene.Scene;
+import javafx.stage.Stage;
+
+/**
+ * The main application class for JavaFX responsible for loading
+ * and displaying the fxml file.
+ */
+public class AbacusApplication extends Application {
+
+    @Override
+    public void start(Stage primaryStage) throws Exception {
+        Parent parent = FXMLLoader.load(getClass().getResource("/abacus.fxml"));
+        Scene mainScene = new Scene(parent, 320, 480);
+        primaryStage.setScene(mainScene);
+        primaryStage.setTitle("Abacus");
+        primaryStage.show();
+    }
+
+}

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

@@ -0,0 +1,240 @@
+package org.nwapw.abacus.fx;
+
+import javafx.collections.FXCollections;
+import javafx.collections.ObservableList;
+import javafx.fxml.FXML;
+import javafx.scene.control.*;
+import javafx.scene.control.cell.CheckBoxListCell;
+import javafx.scene.text.Text;
+import javafx.util.Callback;
+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.PluginListener;
+import org.nwapw.abacus.plugin.PluginManager;
+import org.nwapw.abacus.tree.TreeNode;
+
+import java.util.Set;
+
+
+/**
+ * The controller for the abacus FX UI, responsible
+ * for all the user interaction.
+ */
+public class AbacusController implements PluginListener {
+
+    /**
+     * The title for the apply alert dialog.
+     */
+    private static final String APPLY_MSG_TITLE = "\"Apply\" Needed";
+    /**
+     * The text for the header of the apply alert dialog.
+     */
+    private static final String APPLY_MSG_HEADER = "The settings have not been applied.";
+    /**
+     * The text for the dialog that is shown if settings haven't been applied.
+     */
+    private static final String APPLY_MSG_TEXT = "You have made changes to the configuration, however, you haven't pressed \"Apply\". " +
+                "The changes to the configuration will not be present in the calculator until \"Apply\" is pressed.";
+    /**
+     * Constant string that is displayed if the text could not be lexed or parsed.
+     */
+    private static final String ERR_SYNTAX = "Syntax Error";
+    /**
+     * Constant string that is displayed if the tree could not be reduced.
+     */
+    private static final String ERR_EVAL = "Evaluation Error";
+
+    @FXML
+    private TabPane coreTabPane;
+    @FXML
+    private Tab calculateTab;
+    @FXML
+    private Tab settingsTab;
+    @FXML
+    private TableView<HistoryModel> historyTable;
+    @FXML
+    private TableColumn<HistoryModel, String> inputColumn;
+    @FXML
+    private TableColumn<HistoryModel, String> parsedColumn;
+    @FXML
+    private TableColumn<HistoryModel, String> outputColumn;
+    @FXML
+    private Text outputText;
+    @FXML
+    private TextField inputField;
+    @FXML
+    private Button inputButton;
+    @FXML
+    private ComboBox<String> numberImplementationBox;
+    @FXML
+    private ListView<ToggleablePlugin> enabledPluginView;
+
+    /**
+     * The list of history entries, created by the users.
+     */
+    private ObservableList<HistoryModel> historyData;
+
+    /**
+     * The abacus instance used for calculations and all
+     * other main processing code.
+     */
+    private ObservableList<String> numberImplementationOptions;
+
+    /**
+     * The list of plugin objects that can be toggled on and off,
+     * and, when reloaded, get added to the plugin manager's black list.
+     */
+    private ObservableList<ToggleablePlugin> enabledPlugins;
+
+    /**
+     * The abacus instance used for changing the plugin configuration.
+     */
+    private Abacus abacus;
+
+    /**
+     * Boolean which represents whether changes were made to the configuration.
+     */
+    private boolean changesMade;
+    /**
+     * Whether an alert about changes to the configuration was already shown.
+     */
+    private boolean reloadAlertShown;
+    /**
+     * The alert shown when a press to "apply" is needed.
+     */
+    private Alert reloadAlert;
+
+    /**
+     * Alerts the user if the changes they made
+     * have not yet been applied.
+     */
+    private void alertIfApplyNeeded(boolean ignorePrevious){
+        if(changesMade && (!reloadAlertShown || ignorePrevious)) {
+            reloadAlertShown = true;
+            reloadAlert.showAndWait();
+        }
+    }
+
+    @FXML
+    public void initialize(){
+        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>() {
+                    @Override
+                    public String toString(ToggleablePlugin object) {
+                        return object.getClassName().substring(object.getClassName().lastIndexOf('.') + 1);
+                    }
+
+                    @Override
+                    public ToggleablePlugin fromString(String string) {
+                        return new ToggleablePlugin(true, string);
+                    }
+                });
+
+        historyData = FXCollections.observableArrayList();
+        historyTable.setItems(historyData);
+        numberImplementationOptions = FXCollections.observableArrayList();
+        numberImplementationBox.setItems(numberImplementationOptions);
+        numberImplementationBox.getSelectionModel().selectedIndexProperty().addListener(e -> changesMade = true);
+        historyTable.getSelectionModel().setCellSelectionEnabled(true);
+        enabledPlugins = FXCollections.observableArrayList();
+        enabledPluginView.setItems(enabledPlugins);
+        enabledPluginView.setCellFactory(pluginCellFactory);
+        inputColumn.setCellFactory(cellFactory);
+        inputColumn.setCellValueFactory(cell -> cell.getValue().inputProperty());
+        parsedColumn.setCellFactory(cellFactory);
+        parsedColumn.setCellValueFactory(cell -> cell.getValue().parsedProperty());
+        outputColumn.setCellFactory(cellFactory);
+        outputColumn.setCellValueFactory(cell -> cell.getValue().outputProperty());
+        coreTabPane.getSelectionModel().selectedItemProperty().addListener((observable, oldValue, newValue) -> {
+            if(oldValue.equals(settingsTab)) alertIfApplyNeeded(true);
+        });
+
+        abacus = new Abacus();
+        abacus.getPluginManager().addListener(this);
+        abacus.getPluginManager().reload();
+
+        changesMade = false;
+        reloadAlertShown = false;
+
+        reloadAlert = new Alert(Alert.AlertType.WARNING);
+        reloadAlert.setTitle(APPLY_MSG_TITLE);
+        reloadAlert.setHeaderText(APPLY_MSG_HEADER);
+        reloadAlert.setContentText(APPLY_MSG_TEXT);
+    }
+
+    @FXML
+    private void performCalculation(){
+        inputButton.setDisable(true);
+        TreeNode constructedTree = abacus.parseString(inputField.getText());
+        if(constructedTree == null){
+            outputText.setText(ERR_SYNTAX);
+            inputButton.setDisable(false);
+            return;
+        }
+        NumberInterface evaluatedNumber = abacus.evaluateTree(constructedTree);
+        if(evaluatedNumber == null){
+            outputText.setText(ERR_EVAL);
+            inputButton.setDisable(false);
+            return;
+        }
+        outputText.setText(evaluatedNumber.toString());
+        historyData.add(new HistoryModel(inputField.getText(), constructedTree.toString(), evaluatedNumber.toString()));
+
+        inputButton.setDisable(false);
+        inputField.setText("");
+    }
+
+    @FXML
+    private void performSaveAndReload(){
+        performSave();
+        performReload();
+        changesMade = false;
+        reloadAlertShown = false;
+    }
+
+    @FXML
+    private void performReload(){
+        alertIfApplyNeeded(true);
+        abacus.getPluginManager().reload();
+    }
+
+    @FXML
+    private void performSave(){
+        Configuration configuration = abacus.getConfiguration();
+        configuration.setNumberImplementation(numberImplementationBox.getSelectionModel().getSelectedItem());
+        Set<String> disabledPlugins = configuration.getDisabledPlugins();
+        disabledPlugins.clear();
+        for(ToggleablePlugin pluginEntry : enabledPlugins){
+            if(!pluginEntry.isEnabled()) disabledPlugins.add(pluginEntry.getClassName());
+        }
+        configuration.saveTo(Abacus.CONFIG_FILE);
+        changesMade = false;
+        reloadAlertShown = false;
+    }
+
+    @Override
+    public void onLoad(PluginManager manager) {
+        Configuration configuration = abacus.getConfiguration();
+        Set<String> disabledPlugins = configuration.getDisabledPlugins();
+        numberImplementationOptions.addAll(abacus.getPluginManager().getAllNumbers());
+        String actualImplementation = configuration.getNumberImplementation();
+        String toSelect = (numberImplementationOptions.contains(actualImplementation)) ? actualImplementation : "<default>";
+        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);
+            enabledPlugins.add(plugin);
+        }
+    }
+
+    @Override
+    public void onUnload(PluginManager manager) {
+        enabledPlugins.clear();
+        numberImplementationOptions.clear();
+    }
+}

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

@@ -0,0 +1,35 @@
+package org.nwapw.abacus.fx;
+
+import javafx.scene.control.TableCell;
+import javafx.scene.input.MouseEvent;
+
+import java.awt.*;
+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.
+ */
+public class CopyableCell<S, T> extends TableCell<S, T> {
+
+    /**
+     * Creates a new copyable cell.
+     */
+    public CopyableCell(){
+        addEventFilter(MouseEvent.MOUSE_CLICKED, event -> {
+            if(event.getClickCount() == 2){
+                Toolkit.getDefaultToolkit().getSystemClipboard()
+                        .setContents(new StringSelection(getText()), null);
+            }
+        });
+    }
+
+    @Override
+    protected void updateItem(T item, boolean empty) {
+        super.updateItem(item, empty);
+        setText((empty || item == null) ? null : item.toString());
+        setGraphic(null);
+    }
+}

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

@@ -0,0 +1,87 @@
+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

@@ -0,0 +1,29 @@
+package org.nwapw.abacus.fx;
+
+import javafx.beans.property.BooleanProperty;
+import javafx.beans.property.SimpleBooleanProperty;
+
+public class ToggleablePlugin {
+
+    private final BooleanProperty enabled;
+    private final String className;
+
+    public ToggleablePlugin(boolean enabled, String className){
+        this.enabled = new SimpleBooleanProperty();
+        this.enabled.setValue(enabled);
+        this.className = className;
+    }
+
+    public BooleanProperty enabledProperty() {
+        return enabled;
+    }
+
+    public boolean isEnabled() {
+        return enabled.get();
+    }
+
+    public String getClassName() {
+        return className;
+    }
+
+}

src/main/java/org/nwapw/abacus/lexing/Lexer.java

@@ -10,47 +10,11 @@ import java.util.*;
 /**
  * A lexer that can generate tokens of a given type given a list of regular expressions
  * to operate on.
+ *
  * @param <T> the type used to identify which match belongs to which pattern.
  */
 public class Lexer<T> {
 
-    /**
-     * An entry that represents a pattern that has been registered with the lexer.
-     * @param <T> the type used to identify the pattern.
-     */
-    private static class PatternEntry<T>{
-        /**
-         * The name of the entry.
-         */
-        public String name;
-        /**
-         * The id of the entry.
-         */
-        public T id;
-
-        /**
-         * Creates a new pattern entry with the given name and id.
-         * @param name the name of the pattern entry.
-         * @param id the id of the pattern entry.
-         */
-        public PatternEntry(String name, T id){
-            this.name = name;
-            this.id = id;
-        }
-
-        @Override
-        public int hashCode() {
-            return Objects.hash(name, id);
-        }
-
-        @Override
-        public boolean equals(Object obj) {
-            return obj instanceof PatternEntry &&
-                    ((PatternEntry) obj).name.equals(name) &&
-                    ((PatternEntry) obj).id.equals(id);
-        }
-    }
-
     /**
      * The registered patterns.
      */
@@ -65,6 +29,7 @@ public class Lexer<T> {
 
     /**
      * Registers a single pattern.
+     *
      * @param pattern the pattern regex
      * @param id      the ID by which to identify the pattern.
      */
@@ -75,6 +40,7 @@ public class Lexer<T> {
 
     /**
      * Unregisters a pattern.
+     *
      * @param pattern the pattern to unregister
      * @param id      the ID by which to identify the pattern.
      */
@@ -84,6 +50,7 @@ public class Lexer<T> {
 
     /**
      * Reads one token from the given string.
+     *
      * @param from    the string to read from
      * @param startAt the index to start at
      * @param compare the comparator used to sort tokens by their ID.
@@ -122,6 +89,7 @@ public class Lexer<T> {
 
     /**
      * Reads all tokens from a string.
+     *
      * @param from    the string to start from.
      * @param startAt the index to start at.
      * @param compare the comparator used to sort matches by their IDs.
@@ -141,4 +109,43 @@ public class Lexer<T> {
         return matches;
     }
 
+    /**
+     * An entry that represents a pattern that has been registered with the lexer.
+     *
+     * @param <T> the type used to identify the pattern.
+     */
+    private static class PatternEntry<T> {
+        /**
+         * The name of the entry.
+         */
+        public String name;
+        /**
+         * The id of the entry.
+         */
+        public T id;
+
+        /**
+         * Creates a new pattern entry with the given name and id.
+         *
+         * @param name the name of the pattern entry.
+         * @param id   the id of the pattern entry.
+         */
+        public PatternEntry(String name, T id) {
+            this.name = name;
+            this.id = id;
+        }
+
+        @Override
+        public int hashCode() {
+            return Objects.hash(name, id);
+        }
+
+        @Override
+        public boolean equals(Object obj) {
+            return obj instanceof PatternEntry &&
+                    ((PatternEntry) obj).name.equals(name) &&
+                    ((PatternEntry) obj).id.equals(id);
+        }
+    }
+
 }

src/main/java/org/nwapw/abacus/lexing/pattern/AnyNode.java

@@ -2,6 +2,7 @@ package org.nwapw.abacus.lexing.pattern;
 
 /**
  * A pattern node that matches any character.
+ *
  * @param <T> the type that's used to tell which pattern this node belongs to.
  */
 public class AnyNode<T> extends PatternNode<T> {

src/main/java/org/nwapw/abacus/lexing/pattern/EndNode.java

@@ -2,6 +2,7 @@ package org.nwapw.abacus.lexing.pattern;
 
 /**
  * A node that represents a successful match.
+ *
  * @param <T> the type that's used to tell which pattern this node belongs to.
  */
 public class EndNode<T> extends PatternNode<T> {
@@ -13,6 +14,7 @@ public class EndNode<T> extends PatternNode<T> {
 
     /**
      * Creates a new end node with the given ID.
+     *
      * @param patternId the pattern ID.
      */
     public EndNode(T patternId) {
@@ -21,6 +23,7 @@ public class EndNode<T> extends PatternNode<T> {
 
     /**
      * Gets the pattern ID.
+     *
      * @return the pattern ID.
      */
     public T getPatternId() {

src/main/java/org/nwapw/abacus/lexing/pattern/LinkNode.java

@@ -1,10 +1,10 @@
 package org.nwapw.abacus.lexing.pattern;
 
-import java.util.ArrayList;
 import java.util.Collection;
 
 /**
  * A node that is used as structural glue in pattern compilation.
+ *
  * @param <T> the type that's used to tell which pattern this node belongs to.
  */
 public class LinkNode<T> extends PatternNode<T> {

src/main/java/org/nwapw/abacus/lexing/pattern/Match.java

@@ -2,6 +2,7 @@ package org.nwapw.abacus.lexing.pattern;
 
 /**
  * A match that has been generated by the lexer.
+ *
  * @param <T> the type used to represent the ID of the pattern this match belongs to.
  */
 public class Match<T> {
@@ -17,6 +18,7 @@ public class Match<T> {
 
     /**
      * Creates a new match with the given parameters.
+     *
      * @param content the content of this match.
      * @param type    the type of the match.
      */
@@ -27,6 +29,7 @@ public class Match<T> {
 
     /**
      * Gets the content of this match.
+     *
      * @return the content.
      */
     public String getContent() {
@@ -35,6 +38,7 @@ public class Match<T> {
 
     /**
      * Gets the pattern type of the node.
+     *
      * @return the ID of the pattern that this match matched.
      */
     public T getType() {

src/main/java/org/nwapw/abacus/lexing/pattern/Pattern.java

@@ -8,6 +8,7 @@ import java.util.function.Function;
 
 /**
  * A pattern that can be compiled from a string and used in lexing.
+ *
  * @param <T> the type that is used to identify and sort this pattern.
  */
 public class Pattern<T> {
@@ -40,9 +41,49 @@ public class Pattern<T> {
                 put('?', Pattern.this::transformQuestion);
             }};
 
+    /**
+     * Creates / compiles a new pattern with the given id from the given string.
+     *
+     * @param from the string to compile a pattern from.
+     * @param id   the ID to use.
+     */
+    public Pattern(String from, T id) {
+        this.id = id;
+        index = 0;
+        source = from;
+
+        PatternChain<T> chain = parseSegment(false);
+        if (chain == null) {
+            head = null;
+        } else {
+            chain.append(new EndNode<>(id));
+            head = chain.head;
+        }
+    }
+
+    /**
+     * Removes all characters that are considered "special" from
+     * the given string.
+     *
+     * @param from the string to sanitize.
+     * @return the resulting string.
+     */
+    public static String sanitize(String from) {
+        Pattern<Integer> pattern = new Pattern<>("", 0);
+        from = from.replace(".", "\\.");
+        from = from.replace("|", "\\|");
+        from = from.replace("(", "\\(");
+        from = from.replace(")", "\\)");
+        for (Character key : pattern.operations.keySet()) {
+            from = from.replace("" + key, "\\" + key);
+        }
+        return from;
+    }
+
     /**
      * A regex operator function that turns the chain
      * into a one-or-more chain.
+     *
      * @param chain the chain to transform.
      * @return the modified chain.
      */
@@ -54,6 +95,7 @@ public class Pattern<T> {
     /**
      * A regex operator function that turns the chain
      * into a zero-or-more chain.
+     *
      * @param chain the chain to transform.
      * @return the modified chain.
      */
@@ -72,6 +114,7 @@ public class Pattern<T> {
     /**
      * A regex operator function that turns the chain
      * into a zero-or-one chain.
+     *
      * @param chain the chain to transform.
      * @return the modified chain.
      */
@@ -88,6 +131,7 @@ public class Pattern<T> {
 
     /**
      * Combines a collection of chains into one OR chain.
+     *
      * @param collection the collection of chains to combine.
      * @return the resulting OR chain.
      */
@@ -104,6 +148,7 @@ public class Pattern<T> {
 
     /**
      * Parses a single value from the input into a chain.
+     *
      * @return the resulting chain, or null on error.
      */
     private PatternChain<T> parseValue() {
@@ -116,6 +161,7 @@ public class Pattern<T> {
 
     /**
      * Parses a [] range from the input into a chain.
+     *
      * @return the resulting chain, or null on error.
      */
     private PatternChain<T> parseOr() {
@@ -142,6 +188,7 @@ public class Pattern<T> {
 
     /**
      * Parses a repeatable segment from the input into a chain
+     *
      * @param isSubsegment whether the segment is a sub-expression "()", and therefore
      *                     whether to expect a closing brace.
      * @return the resulting chain, or null on error.
@@ -210,48 +257,12 @@ public class Pattern<T> {
         return fullChain;
     }
 
-    /**
-     * Creates / compiles a new pattern with the given id from the given string.
-     * @param from the string to compile a pattern from.
-     * @param id the ID to use.
-     */
-    public Pattern(String from, T id){
-        this.id = id;
-        index = 0;
-        source = from;
-
-        PatternChain<T> chain = parseSegment(false);
-        if(chain == null) {
-            head = null;
-        } else {
-            chain.append(new EndNode<>(id));
-            head = chain.head;
-        }
-    }
-
     /**
      * Gets the head PatternNode, for use in matching
+     *
      * @return the pattern node.
      */
     public PatternNode<T> getHead() {
         return head;
     }
-
-    /**
-     * Removes all characters that are considered "special" from
-     * the given string.
-     * @param from the string to sanitize.
-     * @return the resulting string.
-     */
-    public static String sanitize(String from){
-        Pattern<Integer> pattern = new Pattern<>("", 0);
-        from = from.replace(".", "\\.");
-        from = from.replace("|", "\\|");
-        from = from.replace("(", "\\(");
-        from = from.replace(")", "\\)");
-        for(Character key : pattern.operations.keySet()){
-            from = from.replace("" + key, "\\" + key);
-        }
-        return from;
-    }
 }

src/main/java/org/nwapw/abacus/lexing/pattern/PatternChain.java

@@ -3,6 +3,7 @@ package org.nwapw.abacus.lexing.pattern;
 /**
  * A chain of nodes that can be treated as a single unit.
  * Used during pattern compilation.
+ *
  * @param <T> the type used to identify which pattern has been matched.
  */
 public class PatternChain<T> {
@@ -18,6 +19,7 @@ public class PatternChain<T> {
 
     /**
      * Creates a new chain with the given start and end.
+     *
      * @param head the start of the chain.
      * @param tail the end of the chain.
      */
@@ -28,6 +30,7 @@ public class PatternChain<T> {
 
     /**
      * Creates a chain that starts and ends with the same node.
+     *
      * @param node the node to use.
      */
     public PatternChain(PatternNode<T> node) {
@@ -45,6 +48,7 @@ public class PatternChain<T> {
      * Appends the other chain to this one. This modifies
      * the nodes, as well.
      * If this chain is empty, it is set to the other.
+     *
      * @param other the other chain to append.
      */
     public void append(PatternChain<T> other) {
@@ -61,6 +65,7 @@ public class PatternChain<T> {
      * Appends a single node to this chain. This modifies
      * the nodes, as well.
      * If this chain is empty, it is set to the node.
+     *
      * @param node the node to append to this chain.
      */
     public void append(PatternNode<T> node) {

src/main/java/org/nwapw/abacus/lexing/pattern/PatternNode.java

@@ -1,6 +1,5 @@
 package org.nwapw.abacus.lexing.pattern;
 
-import java.util.ArrayList;
 import java.util.Collection;
 import java.util.HashSet;
 import java.util.Set;
@@ -9,6 +8,7 @@ import java.util.Set;
  * A base class for a pattern node. Provides all functions
  * necessary for matching, and is constructed by a Pattern instance
  * from a string.
+ *
  * @param <T> the type that's used to tell which pattern this node belongs to.
  */
 public class PatternNode<T> {
@@ -29,6 +29,7 @@ public class PatternNode<T> {
     /**
      * Determines whether the current input character can
      * be matched by this node.
+     *
      * @param other the character being matched.
      * @return true if the character can be matched, false otherwise.
      */
@@ -38,6 +39,7 @@ public class PatternNode<T> {
 
     /**
      * If this node can be used as part of a range, returns that value.
+     *
      * @return a NULL terminator if this character cannot be converted
      * into a range bound, or the appropriate range bound if it can.
      */
@@ -47,6 +49,7 @@ public class PatternNode<T> {
 
     /**
      * Adds this node in a collection of other nodes.
+     *
      * @param into the collection to add into.
      */
     public void addInto(Collection<PatternNode<T>> into) {
@@ -55,6 +58,7 @@ public class PatternNode<T> {
 
     /**
      * Adds the node's children into a collection of other nodes.
+     *
      * @param into the collection to add into.
      */
     public void addOutputsInto(Collection<PatternNode<T>> into) {

src/main/java/org/nwapw/abacus/lexing/pattern/RangeNode.java

@@ -2,6 +2,7 @@ package org.nwapw.abacus.lexing.pattern;
 
 /**
  * A node that matches a range of characters.
+ *
  * @param <T> the type that's used to tell which pattern this node belongs to.
  */
 public class RangeNode<T> extends PatternNode<T> {
@@ -17,6 +18,7 @@ public class RangeNode<T> extends PatternNode<T> {
 
     /**
      * Creates a new range node from the given range.
+     *
      * @param from the bottom bound of the range.
      * @param to   the top bound of hte range.
      */

src/main/java/org/nwapw/abacus/lexing/pattern/ValueNode.java

@@ -2,6 +2,7 @@ package org.nwapw.abacus.lexing.pattern;
 
 /**
  * A node that matches a single value.
+ *
  * @param <T> the type that's used to tell which pattern this node belongs to.
  */
 public class ValueNode<T> extends PatternNode<T> {
@@ -13,6 +14,7 @@ public class ValueNode<T> extends PatternNode<T> {
 
     /**
      * Creates a new node that matches the given character.
+     *
      * @param value
      */
     public ValueNode(char value) {

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

@@ -5,26 +5,6 @@ package org.nwapw.abacus.number;
  */
 public class NaiveNumber implements NumberInterface {
 
-    /**
-     * The value of this number.
-     */
-    private double value;
-
-    /**
-     * Creates a new NaiveNumber with the given string.
-     * @param value the value, which will be parsed as a double.
-     */
-    public NaiveNumber(String value) {
-        this(Double.parseDouble(value));
-    }
-    /**
-     * Creates a new NaiveNumber with the given value.
-     * @param value the value to use.
-     */
-    public NaiveNumber(double value) {
-        this.value = value;
-    }
-
     /**
      * The number zero.
      */
@@ -33,6 +13,27 @@ public class NaiveNumber implements NumberInterface {
      * The number one.
      */
     public static final NaiveNumber ONE = new NaiveNumber(1);
+    /**
+     * The value of this number.
+     */
+    private double value;
+
+    /**
+     * Creates a new NaiveNumber with the given string.
+     *
+     * @param value the value, which will be parsed as a double.
+     */
+    public NaiveNumber(String value) {
+        this(Double.parseDouble(value));
+    }
+    /**
+     * Creates a new NaiveNumber with the given value.
+     *
+     * @param value the value to use.
+     */
+    public NaiveNumber(double value) {
+        this.value = value;
+    }
 
     @Override
     public int getMaxPrecision() {
@@ -92,6 +93,11 @@ public class NaiveNumber implements NumberInterface {
         return this.compareTo(ZERO);
     }
 
+    @Override
+    public int ceiling() {
+        return (int) Math.ceil(value);
+    }
+
     @Override
     public NumberInterface promoteTo(Class<? extends NumberInterface> toClass) {
         if (toClass == this.getClass()) return this;

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

@@ -7,6 +7,7 @@ public interface NumberInterface {
 
     /**
      * The maximum precision to which this number operates.
+     *
      * @return the precision.
      */
     int getMaxPrecision();
@@ -14,27 +15,34 @@ public interface NumberInterface {
     /**
      * Multiplies this number by another, returning
      * a new number instance.
+     *
      * @param multiplier the multiplier
      * @return the result of the multiplication.
      */
     NumberInterface multiply(NumberInterface multiplier);
+
     /**
      * Divides this number by another, returning
      * a new number instance.
+     *
      * @param divisor the divisor
      * @return the result of the division.
      */
     NumberInterface divide(NumberInterface divisor);
+
     /**
      * Adds this number to another, returning
      * a new number instance.
+     *
      * @param summand the summand
      * @return the result of the summation.
      */
     NumberInterface add(NumberInterface summand);
+
     /**
      * Subtracts another number from this number,
      * a new number instance.
+     *
      * @param subtrahend the subtrahend.
      * @return the result of the subtraction.
      */
@@ -43,12 +51,14 @@ public interface NumberInterface {
     /**
      * Returns a new instance of this number with
      * the sign flipped.
+     *
      * @return the new instance.
      */
     NumberInterface negate();
 
     /**
      * Raises this number to an integer power.
+     *
      * @param exponent the exponent to which to take the number.
      * @return the resulting value.
      */
@@ -56,6 +66,7 @@ public interface NumberInterface {
 
     /**
      * Compares this number to another.
+     *
      * @param number the number to compare to.
      * @return same as Integer.compare();
      */
@@ -63,12 +74,20 @@ public interface NumberInterface {
 
     /**
      * Same as Math.signum().
+     *
      * @return 1 if this number is positive, -1 if this number is negative, 0 if this number is 0.
      */
     int signum();
 
+    /**
+     * Returns the least integer greater than or equal to the number.
+     * @return the least integer >= the number, if int can hold the value.
+     */
+    int ceiling();
+
     /**
      * Promotes this class to another number class.
+     *
      * @param toClass the class to promote to.
      * @return the resulting new instance.
      */

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

@@ -3,6 +3,10 @@ package org.nwapw.abacus.number;
 import java.math.BigDecimal;
 import java.math.RoundingMode;
 
+/**
+ * A number that uses a BigDecimal to store its value,
+ * leading to infinite possible precision.
+ */
 public class PreciseNumber implements NumberInterface {
 
     /**
@@ -25,6 +29,7 @@ public class PreciseNumber implements NumberInterface{
 
     /**
      * Constructs a precise number from the given string.
+     *
      * @param string a string representation of the number meeting the same conditions
      *               as the BidDecimal(String) constructor.
      */
@@ -34,6 +39,7 @@ public class PreciseNumber implements NumberInterface{
 
     /**
      * Constructs a precise number from the given BigDecimal.
+     *
      * @param value a BigDecimal object representing the value of the number.
      */
     public PreciseNumber(BigDecimal value) {
@@ -42,12 +48,12 @@ public class PreciseNumber implements NumberInterface{
 
     @Override
     public int getMaxPrecision() {
-        return 54;
+        return 65;
     }
 
     @Override
     public NumberInterface multiply(NumberInterface multiplier) {
-        return new PreciseNumber(value.multiply(((PreciseNumber) multiplier).value));
+        return new PreciseNumber(this.value.multiply(((PreciseNumber) multiplier).value));
     }
 
     @Override
@@ -92,6 +98,11 @@ public class PreciseNumber implements NumberInterface{
         return value.signum();
     }
 
+    @Override
+    public int ceiling() {
+        return (int) Math.ceil(value.doubleValue());
+    }
+
     @Override
     public NumberInterface negate() {
         return new PreciseNumber(value.negate());
@@ -107,7 +118,7 @@ public class PreciseNumber implements NumberInterface{
 
     @Override
     public String toString() {
-        BigDecimal rounded = value.setScale(getMaxPrecision() - 4, RoundingMode.HALF_UP);
+        BigDecimal rounded = value.setScale(getMaxPrecision() - 15, RoundingMode.HALF_UP);
         return rounded.stripTrailingZeros().toPlainString();
     }
 }

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

@@ -7,12 +7,14 @@ import java.util.List;
 /**
  * An itnerface that provides the ability to convert a list of tokens
  * into a parse tree.
+ *
  * @param <T> the type of tokens accepted by this parser.
  */
 public interface Parser<T> {
 
     /**
      * Constructs a tree out of the given tokens.
+     *
      * @param tokens the tokens to construct a tree from.
      * @return the constructed tree, or null on error.
      */

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

@@ -36,6 +36,7 @@ public class ShuntingYardParser implements Parser<Match<TokenType>>, PluginListe
 
     /**
      * Creates a new Shunting Yard parser with the given Abacus instance.
+     *
      * @param abacus the abacus instance.
      */
     public ShuntingYardParser(Abacus abacus) {
@@ -47,15 +48,19 @@ public class ShuntingYardParser implements Parser<Match<TokenType>>, PluginListe
 
     /**
      * Rearranges tokens into a postfix list, using Shunting Yard.
+     *
      * @param from the tokens to be rearranged.
      * @return the resulting list of rearranged tokens.
      */
     public List<Match<TokenType>> intoPostfix(List<Match<TokenType>> from) {
         ArrayList<Match<TokenType>> output = new ArrayList<>();
         Stack<Match<TokenType>> tokenStack = new Stack<>();
+        TokenType previousType;
+        TokenType matchType = null;
         while (!from.isEmpty()) {
             Match<TokenType> match = from.remove(0);
-            TokenType matchType = match.getType();
+            previousType = matchType;
+            matchType = match.getType();
             if (matchType == TokenType.NUM) {
                 output.add(match);
             } else if (matchType == TokenType.FUNCTION) {
@@ -72,13 +77,19 @@ public class ShuntingYardParser implements Parser<Match<TokenType>>, PluginListe
                     continue;
                 }
 
-                while(!tokenStack.empty()) {
+                if(tokenString.equals("-") && (previousType == null || previousType == TokenType.OP ||
+                        previousType == TokenType.OPEN_PARENTH)){
+                    from.add(0, new Match<>("`", TokenType.OP));
+                    continue;
+                }
+
+                while (!tokenStack.empty() && type == OperatorType.BINARY_INFIX) {
                     Match<TokenType> otherMatch = tokenStack.peek();
                     TokenType otherMatchType = otherMatch.getType();
                     if (!(otherMatchType == TokenType.OP || otherMatchType == TokenType.FUNCTION)) break;
 
                     if (otherMatchType == TokenType.OP) {
-                        int otherPrecedence = precedenceMap.get(match.getContent());
+                        int otherPrecedence = precedenceMap.get(otherMatch.getContent());
                         if (otherPrecedence < precedence ||
                                 (associativity == OperatorAssociativity.RIGHT && otherPrecedence == precedence)) {
                             break;
@@ -101,8 +112,8 @@ public class ShuntingYardParser implements Parser<Match<TokenType>>, PluginListe
         }
         while (!tokenStack.empty()) {
             Match<TokenType> match = tokenStack.peek();
-            TokenType matchType = match.getType();
+            TokenType newMatchType = match.getType();
-            if(!(matchType == TokenType.OP || matchType == TokenType.FUNCTION)) return null;
+            if (!(newMatchType == TokenType.OP || newMatchType == TokenType.FUNCTION)) return null;
             output.add(tokenStack.pop());
         }
         return output;
@@ -110,6 +121,7 @@ public class ShuntingYardParser implements Parser<Match<TokenType>>, PluginListe
 
     /**
      * Constructs a tree recursively from a list of tokens.
+     *
      * @param matches the list of tokens from the source string.
      * @return the construct tree expression.
      */
@@ -124,11 +136,11 @@ public class ShuntingYardParser implements Parser<Match<TokenType>>, PluginListe
                 TreeNode right = constructRecursive(matches);
                 TreeNode left = constructRecursive(matches);
                 if (left == null || right == null) return null;
-                else return new BinaryInfixNode(operator, left, right);
+                else return new BinaryNode(operator, left, right);
             } else {
                 TreeNode applyTo = constructRecursive(matches);
                 if (applyTo == null) return null;
-                else return new UnaryPrefixNode(operator, applyTo);
+                else return new UnaryNode(operator, applyTo);
             }
         } else if (matchType == TokenType.NUM) {
             return new NumberNode(abacus.numberFromString(match.getContent()));

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

@@ -4,12 +4,14 @@ import java.util.List;
 
 /**
  * Interface that provides the ability to convert a string into a list of tokens.
+ *
  * @param <T> the type of the tokens produced.
  */
 public interface Tokenizer<T> {
 
     /**
      * Converts a string into tokens.
+     *
      * @param string the string to convert.
      * @return the list of tokens, or null on error.
      */

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

@@ -0,0 +1,50 @@
+package org.nwapw.abacus.parsing;
+
+import org.nwapw.abacus.tree.TreeNode;
+
+import java.util.List;
+
+/**
+ * TreeBuilder class used to piece together a Tokenizer and
+ * Parser of the same kind. This is used to essentially avoid
+ * working with any parameters at all, and the generics
+ * in this class are used only to ensure the tokenizer and parser
+ * are of the same type.
+ *
+ * @param <T> the type of tokens created by the tokenizer and used by the parser.
+ */
+public class TreeBuilder<T> {
+
+    /**
+     * The tokenizer used to convert a string into tokens.
+     */
+    private Tokenizer<T> tokenizer;
+    /**
+     * The parser used to parse a list of tokens into a tree.
+     */
+    private Parser<T> parser;
+
+    /**
+     * Create a new Tree Builder with the given tokenizer and parser
+     *
+     * @param tokenizer the tokenizer to turn strings into tokens
+     * @param parser    the parser to turn tokens into a tree
+     */
+    public TreeBuilder(Tokenizer<T> tokenizer, Parser<T> parser) {
+        this.tokenizer = tokenizer;
+        this.parser = parser;
+    }
+
+    /**
+     * Parse the given string into a tree.
+     *
+     * @param input the string to parse into a tree.
+     * @return the resulting tree.
+     */
+    public TreeNode fromString(String input) {
+        List<T> tokens = tokenizer.tokenizeString(input);
+        if (tokens == null) return null;
+        return parser.constructTree(tokens);
+    }
+
+}

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

@@ -20,6 +20,7 @@ public class ClassFinder {
 
     /**
      * Loads all the plugin classes from the given plugin folder.
+     *
      * @param filePath the path for the plugin folder.
      * @return the list of all loaded classes.
      * @throws IOException            thrown if an error occurred scanning the plugin folder.
@@ -31,6 +32,7 @@ public class ClassFinder {
 
     /**
      * Loads all the plugin classes from the given plugin folder.
+     *
      * @param pluginFolderPath the folder in which to look for plugins.
      * @return the list of all loaded classes.
      * @throws IOException            thrown if an error occurred scanning the plugin folder.
@@ -51,6 +53,7 @@ public class ClassFinder {
 
     /**
      * Loads the classes from a single path, given by the file.
+     *
      * @param jarLocation the location of the jar to load.
      * @return the list of loaded classes loaded from the jar.
      * @throws IOException            thrown if there was an error reading the file

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

@@ -39,10 +39,12 @@ public abstract class Plugin {
      */
     private boolean enabled;
 
-    private Plugin(){ }
+    private Plugin() {
+    }
 
     /**
      * Creates a new plugin with the given PluginManager.
+     *
      * @param manager the manager controlling this plugin.
      */
     public Plugin(PluginManager manager) {
@@ -55,6 +57,7 @@ public abstract class Plugin {
 
     /**
      * Gets the list of functions provided by this plugin.
+     *
      * @return the list of registered functions.
      */
     public final Set<String> providedFunctions() {
@@ -63,6 +66,7 @@ public abstract class Plugin {
 
     /**
      * Gets the list of functions provided by this plugin.
+     *
      * @return the list of registered functions.
      */
     public final Set<String> providedOperators() {
@@ -71,6 +75,7 @@ public abstract class Plugin {
 
     /**
      * Gets the list of all numbers provided by this plugin.
+     *
      * @return the list of registered numbers.
      */
     public final Set<String> providedNumbers() {
@@ -79,6 +84,7 @@ public abstract class Plugin {
 
     /**
      * Gets a function under the given function name.
+     *
      * @param functionName the name of the function to get
      * @return the function, or null if this plugin doesn't provide it.
      */
@@ -88,6 +94,7 @@ public abstract class Plugin {
 
     /**
      * Gets an operator under the given operator name.
+     *
      * @param operatorName the name of the operator to get.
      * @return the operator, or null if this plugin doesn't provide it.
      */
@@ -97,6 +104,7 @@ public abstract class Plugin {
 
     /**
      * Gets the class under the given name.
+     *
      * @param numberName the name of the class.
      * @return the class, or null if the plugin doesn't provide it.
      */
@@ -129,6 +137,7 @@ public abstract class Plugin {
     /**
      * To be used in load(). Registers a function abstract class with the
      * plugin internally, which makes it accessible to the plugin manager.
+     *
      * @param name       the name to register by.
      * @param toRegister the function implementation.
      */
@@ -140,6 +149,7 @@ public abstract class Plugin {
      * To be used in load(). Registers an operator abstract class
      * with the plugin internally, which makes it accessible to
      * the plugin manager.
+     *
      * @param name     the name of the operator.
      * @param operator the operator to register.
      */
@@ -152,6 +162,7 @@ public abstract class Plugin {
      * with the plugin internally, which makes it possible
      * for the user to select it as an "implementation" for the
      * number that they would like to use.
+     *
      * @param name       the name to register it under.
      * @param toRegister the class to register.
      */
@@ -163,6 +174,7 @@ public abstract class Plugin {
      * Searches the PluginManager for the given function name.
      * This can be used by the plugins internally in order to call functions
      * they do not provide.
+     *
      * @param name the name for which to search
      * @return the resulting function, or null if none was found for that name.
      */
@@ -174,6 +186,7 @@ public abstract class Plugin {
      * Searches the PluginManager for the given operator name.
      * This can be used by the plugins internally in order to call
      * operations they do not provide.
+     *
      * @param name the name for which to search
      * @return the resulting operator, or null if none was found for that name.
      */

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

@@ -7,12 +7,14 @@ public interface PluginListener {
 
     /**
      * Called when the PluginManager loads plugins.
+     *
      * @param manager the manager that fired the event.
      */
     public void onLoad(PluginManager manager);
 
     /**
      * Called when the PluginManager unloads all its plugins.
+     *
      * @param manager the manager that fired the event.
      */
     public void onUnload(PluginManager manager);

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

@@ -54,8 +54,8 @@ public class PluginManager {
      */
     private Set<PluginListener> listeners;
     /**
-     * The instance of Abacus that is used to interact with its other
+     * The abacus instance used to access other
-     * components.
+     * components of the application.
      */
     private Abacus abacus;
 
@@ -80,6 +80,7 @@ public class PluginManager {
      * list of items of the type using the setFunction and getting the value
      * of it is available via getFunction. If the value is contained
      * in the cache, it returns the cached value instead.
+     *
      * @param plugins     the plugin list to search.
      * @param cache       the cache to use
      * @param setFunction the function to retrieve a set of available T's from the plugin
@@ -105,8 +106,10 @@ public class PluginManager {
         cache.put(name, loadedValue);
         return loadedValue;
     }
+
     /**
      * Gets a function under the given name.
+     *
      * @param name the name of the function
      * @return the function under the given name.
      */
@@ -116,6 +119,7 @@ public class PluginManager {
 
     /**
      * Gets an operator under the given name.
+     *
      * @param name the name of the operator.
      * @return the operator under the given name.
      */
@@ -125,6 +129,7 @@ public class PluginManager {
 
     /**
      * Gets a numer implementation under the given name.
+     *
      * @param name the name of the implementation.
      * @return the implementation class
      */
@@ -134,6 +139,7 @@ public class PluginManager {
 
     /**
      * Adds an instance of Plugin that already has been instantiated.
+     *
      * @param plugin the plugin to add.
      */
     public void addInstantiated(Plugin plugin) {
@@ -145,6 +151,7 @@ public class PluginManager {
     /**
      * Instantiates a class of plugin, and adds it to this
      * plugin manager.
+     *
      * @param newClass the new class to instantiate.
      */
     public void addClass(Class<?> newClass) {
@@ -160,8 +167,13 @@ public class PluginManager {
      * Loads all the plugins in the PluginManager.
      */
     public void load() {
-        for(Plugin plugin : plugins) plugin.enable();
+        Set<String> disabledPlugins = abacus.getConfiguration().getDisabledPlugins();
         for (Plugin plugin : plugins) {
+            if(disabledPlugins.contains(plugin.getClass().getName())) continue;
+            plugin.enable();
+        }
+        for (Plugin plugin : plugins) {
+            if(disabledPlugins.contains(plugin.getClass().getName())) continue;
             allFunctions.addAll(plugin.providedFunctions());
             allOperators.addAll(plugin.providedOperators());
             allNumbers.addAll(plugin.providedNumbers());
@@ -173,11 +185,18 @@ public class PluginManager {
      * Unloads all the plugins in the PluginManager.
      */
     public void unload() {
-        for(Plugin plugin : plugins) plugin.disable();
+        listeners.forEach(e -> e.onUnload(this));
+        Set<String> disabledPlugins = abacus.getConfiguration().getDisabledPlugins();
+        for (Plugin plugin : plugins) {
+            if(disabledPlugins.contains(plugin.getClass().getName())) continue;
+            plugin.disable();
+        }
+        cachedFunctions.clear();
+        cachedOperators.clear();
+        cachedNumbers.clear();
         allFunctions.clear();
         allOperators.clear();
         allNumbers.clear();
-        listeners.forEach(e -> e.onUnload(this));
     }
 
     /**
@@ -185,11 +204,12 @@ public class PluginManager {
      */
     public void reload() {
         unload();
-        reload();
+        load();
     }
 
     /**
      * Gets all the functions loaded by the Plugin Manager.
+     *
      * @return the set of all functions that were loaded.
      */
     public Set<String> getAllFunctions() {
@@ -198,6 +218,7 @@ public class PluginManager {
 
     /**
      * Gets all the operators loaded by the Plugin Manager.
+     *
      * @return the set of all operators that were loaded.
      */
     public Set<String> getAllOperators() {
@@ -206,6 +227,7 @@ public class PluginManager {
 
     /**
      * Gets all the number implementations loaded by the Plugin Manager
+     *
      * @return the set of all implementations that were loaded
      */
     public Set<String> getAllNumbers() {
@@ -214,6 +236,7 @@ public class PluginManager {
 
     /**
      * Adds a plugin change listener to this plugin manager.
+     *
      * @param listener the listener to add.
      */
     public void addListener(PluginListener listener) {
@@ -222,10 +245,19 @@ public class PluginManager {
 
     /**
      * Remove the plugin change listener from this plugin manager.
+     *
      * @param listener the listener to remove.
      */
     public void removeListener(PluginListener listener) {
         listeners.remove(listener);
     }
 
+    /**
+     * 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() {
+        return loadedPluginClasses;
+    }
 }

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

@@ -0,0 +1,362 @@
+package org.nwapw.abacus.plugin;
+
+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 java.util.ArrayList;
+import java.util.HashMap;
+import java.util.function.BiFunction;
+
+/**
+ * The plugin providing standard functions such as addition and subtraction to
+ * the calculator.
+ */
+public class StandardPlugin extends Plugin {
+
+    private static HashMap<Class<? extends NumberInterface>, ArrayList<NumberInterface>> factorialLists = new HashMap<Class<? extends NumberInterface>, ArrayList<NumberInterface>>();
+
+    /**
+     * The addition operator, +
+     */
+    public static final Operator OP_ADD = new Operator(OperatorAssociativity.LEFT, OperatorType.BINARY_INFIX, 0, new Function() {
+        @Override
+        protected boolean matchesParams(NumberInterface[] params) {
+            return params.length >= 1;
+        }
+
+        @Override
+        protected NumberInterface applyInternal(NumberInterface[] params) {
+            NumberInterface sum = params[0];
+            for (int i = 1; i < params.length; i++) {
+                sum = sum.add(params[i]);
+            }
+            return sum;
+        }
+    });
+    /**
+     * The subtraction operator, -
+     */
+    public static final Operator OP_SUBTRACT = new Operator(OperatorAssociativity.LEFT, OperatorType.BINARY_INFIX, 0, new Function() {
+        @Override
+        protected boolean matchesParams(NumberInterface[] params) {
+            return params.length == 2;
+        }
+
+        @Override
+        protected NumberInterface applyInternal(NumberInterface[] params) {
+            return params[0].subtract(params[1]);
+        }
+    });
+    /**
+     * The negation operator, -
+     */
+    public static final Operator OP_NEGATE = new Operator(OperatorAssociativity.LEFT, OperatorType.UNARY_PREFIX, 0, new Function() {
+        @Override
+        protected boolean matchesParams(NumberInterface[] params) {
+            return params.length == 1;
+        }
+
+        @Override
+        protected NumberInterface applyInternal(NumberInterface[] params) {
+            return params[0].negate();
+        }
+    });
+    /**
+     * The multiplication operator, *
+     */
+    public static final Operator OP_MULTIPLY = new Operator(OperatorAssociativity.LEFT, OperatorType.BINARY_INFIX, 1, new Function() {
+        @Override
+        protected boolean matchesParams(NumberInterface[] params) {
+            return params.length >= 1;
+        }
+
+        @Override
+        protected NumberInterface applyInternal(NumberInterface[] params) {
+            NumberInterface product = params[0];
+            for (int i = 1; i < params.length; i++) {
+                product = product.multiply(params[i]);
+            }
+            return product;
+        }
+    });
+    /**
+     * The division operator, /
+     */
+    public static final Operator OP_DIVIDE = new Operator(OperatorAssociativity.LEFT, OperatorType.BINARY_INFIX, 1, new Function() {
+        @Override
+        protected boolean matchesParams(NumberInterface[] params) {
+            return params.length == 2;
+        }
+
+        @Override
+        protected NumberInterface applyInternal(NumberInterface[] params) {
+            return params[0].divide(params[1]);
+        }
+    });
+    /**
+     * The factorial operator, !
+     */
+    public static final Operator OP_FACTORIAL = new Operator(OperatorAssociativity.RIGHT, OperatorType.UNARY_POSTFIX, 0, new Function() {
+        //private HashMap<Class<? extends NumberInterface>, ArrayList<NumberInterface>> storedList = new HashMap<Class<? extends NumberInterface>, ArrayList<NumberInterface>>();
+        @Override
+        protected boolean matchesParams(NumberInterface[] params) {
+            return params.length == 1;
+        }
+
+        @Override
+        protected NumberInterface applyInternal(NumberInterface[] params) {
+            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) {
+                factorial = factorial.multiply(multiplier);
+            }
+            return factorial;
+                /*if(!storedList.containsKey(params[0].getClass())){
+                    storedList.put(params[0].getClass(), new ArrayList<NumberInterface>());
+                    storedList.get(params[0].getClass()).add(NaiveNumber.ONE.promoteTo(params[0].getClass()));
+                    storedList.get(params[0].getClass()).add(NaiveNumber.ONE.promoteTo(params[0].getClass()));
+                }*/
+        }
+    });
+    /**
+     * 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
+     */
+    public static final Function FUNCTION_ABS = new Function() {
+        @Override
+        protected boolean matchesParams(NumberInterface[] params) {
+            return params.length == 1;
+        }
+
+        @Override
+        protected NumberInterface applyInternal(NumberInterface[] params) {
+            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())), 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.
+     */
+    public static final Function FUNCTION_LN = new Function() {
+        @Override
+        protected boolean matchesParams(NumberInterface[] params) {
+            return params.length == 1;
+        }
+
+        @Override
+        protected NumberInterface applyInternal(NumberInterface[] params) {
+            NumberInterface param = params[0];
+            int powersOf2 = 0;
+            while (FUNCTION_ABS.apply(param.subtract(NaiveNumber.ONE.promoteTo(param.getClass()))).compareTo((new NaiveNumber(0.1)).promoteTo(param.getClass())) >= 0) {
+                if (param.subtract(NaiveNumber.ONE.promoteTo(param.getClass())).signum() == 1) {
+                    param = param.divide(new NaiveNumber(2).promoteTo(param.getClass()));
+                    powersOf2++;
+                    if (param.subtract(NaiveNumber.ONE.promoteTo(param.getClass())).signum() != 1) {
+                        break;
+                        //No infinite loop for you.
+                    }
+                } else {
+                    param = param.multiply(new NaiveNumber(2).promoteTo(param.getClass()));
+                    powersOf2--;
+                    if (param.subtract(NaiveNumber.ONE.promoteTo(param.getClass())).signum() != -1) {
+                        break;
+                        //No infinite loop for you.
+                    }
+                }
+            }
+            return getLog2(param).multiply((new NaiveNumber(powersOf2)).promoteTo(param.getClass())).add(getLogPartialSum(param));
+        }
+
+        /**
+         * Returns the partial sum of the Taylor series for logx (around x=1).
+         * Automatically determines the number of terms needed based on the precision of x.
+         * @param x value at which the series is evaluated. 0 < x < 2. (x=2 is convergent but impractical.)
+         * @return the partial sum.
+         */
+        private NumberInterface getLogPartialSum(NumberInterface x) {
+            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) {
+                n++;
+                currentNumerator = currentNumerator.multiply(x).negate();
+                currentTerm = currentNumerator.divide(new NaiveNumber(n).promoteTo(x.getClass()));
+                sum = sum.add(currentTerm);
+            }
+            return sum;
+        }
+
+        /**
+         * Returns natural log of 2 to the required precision of the class of number.
+         * @param number a number of the same type as the return type. (Used for precision.)
+         * @return the value of log(2) with the appropriate precision.
+         */
+        private NumberInterface getLog2(NumberInterface number) {
+            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)
+            //In the following, a=1/3^n, b=1/4^n, c = 1/n.
+            //a is also an error bound.
+            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) {
+                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));
+            }
+            return sum;
+        }
+    };
+    /**
+     * The square root function.
+     */
+    public static final Function FUNCTION_SQRT = new Function() {
+        @Override
+        protected boolean matchesParams(NumberInterface[] params) {
+            return params.length == 1;
+        }
+
+        @Override
+        protected NumberInterface applyInternal(NumberInterface[] params) {
+            return OP_CARET.getFunction().apply(params[0], ((new NaiveNumber(0.5)).promoteTo(params[0].getClass())));
+        }
+    };
+
+    public StandardPlugin(PluginManager manager) {
+        super(manager);
+    }
+
+    /**
+     * Returns a partial sum of a series whose terms are given by the nthTermFunction, evaluated at x.
+     *
+     * @param x               the value at which the series is evaluated.
+     * @param nthTermFunction the function that returns the nth term of the series, in the format term(x, n).
+     * @param n               the number of terms in the partial sum.
+     * @return the value of the partial sum that has the same class as x.
+     */
+    private static NumberInterface sumSeries(NumberInterface x, BiFunction<Integer, NumberInterface, NumberInterface> nthTermFunction, int n) {
+        NumberInterface sum = NaiveNumber.ZERO.promoteTo(x.getClass());
+        for (int i = 0; i <= n; i++) {
+            sum = sum.add(nthTermFunction.apply(i, x));
+        }
+        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 (new NaiveNumber(10)).promoteTo(number.getClass()).intPow(-number.getMaxPrecision());
+    }
+
+    @Override
+    public void onEnable() {
+        registerNumber("naive", NaiveNumber.class);
+        registerNumber("precise", PreciseNumber.class);
+
+        registerOperator("+", OP_ADD);
+        registerOperator("-", OP_SUBTRACT);
+        registerOperator("`", OP_NEGATE);
+        registerOperator("*", OP_MULTIPLY);
+        registerOperator("/", OP_DIVIDE);
+        registerOperator("^", OP_CARET);
+        registerOperator("!", OP_FACTORIAL);
+
+        registerFunction("abs", FUNCTION_ABS);
+        registerFunction("exp", FUNCTION_EXP);
+        registerFunction("ln", FUNCTION_LN);
+        registerFunction("sqrt", FUNCTION_SQRT);
+    }
+
+    @Override
+    public void onDisable() {
+
+    }
+
+    public static NumberInterface factorial(Class<? extends NumberInterface> numberClass, int n){
+        if(!factorialLists.containsKey(numberClass)){
+            factorialLists.put(numberClass, new ArrayList<>());
+            factorialLists.get(numberClass).add(NaiveNumber.ONE.promoteTo(numberClass));
+            factorialLists.get(numberClass).add(NaiveNumber.ONE.promoteTo(numberClass));
+        }
+        ArrayList<NumberInterface> list = factorialLists.get(numberClass);
+        if(n >= list.size()){
+            while(list.size() < n + 16){
+                list.add(list.get(list.size()-1).multiply(new NaiveNumber(list.size()).promoteTo(numberClass)));
+            }
+        }
+        return list.get(n);
+    }
+
+}

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

@@ -3,7 +3,7 @@ package org.nwapw.abacus.tree;
 /**
  * A tree node that represents an operation being applied to two operands.
  */
-public class BinaryInfixNode extends TreeNode {
+public class BinaryNode extends TreeNode {
 
     /**
      * The operation being applied.
@@ -18,25 +18,28 @@ public class BinaryInfixNode extends TreeNode {
      */
     private TreeNode right;
 
-    private BinaryInfixNode() {}
+    private BinaryNode() {
+    }
 
     /**
      * Creates a new operation node with the given operation
      * and no child nodes.
+     *
      * @param operation the operation.
      */
-    public BinaryInfixNode(String operation){
+    public BinaryNode(String operation) {
         this(operation, null, null);
     }
 
     /**
      * Creates a new operation node with the given operation
      * and child nodes.
+     *
      * @param operation the operation.
      * @param left      the left node of the expression.
      * @param right     the right node of the expression.
      */
-    public BinaryInfixNode(String operation, TreeNode left, TreeNode right){
+    public BinaryNode(String operation, TreeNode left, TreeNode right) {
         this.operation = operation;
         this.left = left;
         this.right = right;
@@ -44,6 +47,7 @@ public class BinaryInfixNode extends TreeNode {
 
     /**
      * Gets the operation in this node.
+     *
      * @return the operation in this node.
      */
     public String getOperation() {
@@ -52,6 +56,7 @@ public class BinaryInfixNode extends TreeNode {
 
     /**
      * Gets the left sub-expression of this node.
+     *
      * @return the left node.
      */
     public TreeNode getLeft() {
@@ -60,6 +65,7 @@ public class BinaryInfixNode extends TreeNode {
 
     /**
      * Sets the left sub-expression of this node.
+     *
      * @param left the sub-expression to apply.
      */
     public void setLeft(TreeNode left) {
@@ -68,6 +74,7 @@ public class BinaryInfixNode extends TreeNode {
 
     /**
      * Gets the right sub-expression of this node.
+     *
      * @return the right node.
      */
     public TreeNode getRight() {
@@ -76,6 +83,7 @@ public class BinaryInfixNode extends TreeNode {
 
     /**
      * Sets the right sub-expression of this node.
+     *
      * @param right the sub-expression to apply.
      */
     public void setRight(TreeNode right) {

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

@@ -20,10 +20,12 @@ public class FunctionNode extends TreeNode {
     /**
      * Creates a function node with no function.
      */
-    private FunctionNode() { }
+    private FunctionNode() {
+    }
 
     /**
      * Creates a new function node with the given function name.
+     *
      * @param function the function name.
      */
     public FunctionNode(String function) {
@@ -33,6 +35,7 @@ public class FunctionNode extends TreeNode {
 
     /**
      * Gets the function name for this node.
+     *
      * @return the function name.
      */
     public String getFunction() {
@@ -41,6 +44,7 @@ public class FunctionNode extends TreeNode {
 
     /**
      * Adds a child to the end of this node's child list.
+     *
      * @param node the child to add.
      */
     public void appendChild(TreeNode node) {
@@ -49,6 +53,7 @@ public class FunctionNode extends TreeNode {
 
     /**
      * Adds a new child to the beginning of this node's child list.
+     *
      * @param node the node to add.
      */
     public void prependChild(TreeNode node) {

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

@@ -1,6 +1,5 @@
 package org.nwapw.abacus.tree;
 
-import org.nwapw.abacus.number.NaiveNumber;
 import org.nwapw.abacus.number.NumberInterface;
 
 /**
@@ -22,6 +21,7 @@ public class NumberNode extends TreeNode {
 
     /**
      * Creates a new number node with the given double value.
+     *
      * @param newNumber the number for which to create a number node.
      */
     public NumberNode(NumberInterface newNumber) {
@@ -30,6 +30,7 @@ public class NumberNode extends TreeNode {
 
     /**
      * Gets the number value of this node.
+     *
      * @return the number value of this node.
      */
     public NumberInterface getNumber() {

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

@@ -17,6 +17,7 @@ public class NumberReducer implements Reducer<NumberInterface> {
 
     /**
      * Creates a new number reducer.
+     *
      * @param abacus the calculator instance.
      */
     public NumberReducer(Abacus abacus) {
@@ -27,15 +28,15 @@ public class NumberReducer implements Reducer<NumberInterface> {
     public NumberInterface reduceNode(TreeNode node, Object... children) {
         if (node instanceof NumberNode) {
             return ((NumberNode) node).getNumber();
-        } else if(node instanceof BinaryInfixNode){
+        } else if (node instanceof BinaryNode) {
             NumberInterface left = (NumberInterface) children[0];
             NumberInterface right = (NumberInterface) children[1];
-            Function function = abacus.getPluginManager().operatorFor(((BinaryInfixNode) node).getOperation()).getFunction();
+            Function function = abacus.getPluginManager().operatorFor(((BinaryNode) node).getOperation()).getFunction();
             if (function == null) return null;
             return function.apply(left, right);
-        } else if(node instanceof UnaryPrefixNode) {
+        } else if (node instanceof UnaryNode) {
             NumberInterface child = (NumberInterface) children[0];
-            Function functionn = abacus.getPluginManager().operatorFor(((UnaryPrefixNode) node).getOperation()).getFunction();
+            Function functionn = abacus.getPluginManager().operatorFor(((UnaryNode) node).getOperation()).getFunction();
             if (functionn == null) return null;
             return functionn.apply(child);
         } else if (node instanceof FunctionNode) {

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

@@ -2,12 +2,14 @@ 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.

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

@@ -16,6 +16,7 @@ public enum TokenType {
 
     /**
      * Creates a new token type with the given priority.
+     *
      * @param priority the priority of this token type.
      */
     TokenType(int priority) {

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

@@ -1,11 +1,5 @@
 package org.nwapw.abacus.tree;
 
-import org.nwapw.abacus.function.OperatorAssociativity;
-import org.nwapw.abacus.lexing.Lexer;
-import org.nwapw.abacus.lexing.pattern.Match;
-
-import java.util.*;
-
 /**
  * An abstract class that represents an expression tree node.
  */
@@ -13,6 +7,7 @@ public abstract class TreeNode {
 
     /**
      * The function that reduces a tree to a single vale.
+     *
      * @param reducer the reducer used to reduce the tree.
      * @param <T>     the type the reducer produces.
      * @return the result of the reduction, or null on error.

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

@@ -1,6 +1,6 @@
 package org.nwapw.abacus.tree;
 
-public class UnaryPrefixNode extends TreeNode {
+public class UnaryNode extends TreeNode {
 
     /**
      * The operation this node will apply.
@@ -13,18 +13,20 @@ public class UnaryPrefixNode extends TreeNode {
 
     /**
      * Creates a new node with the given operation and no child.
+     *
      * @param operation the operation for this node.
      */
-    public UnaryPrefixNode(String operation){
+    public UnaryNode(String operation) {
         this(operation, null);
     }
 
     /**
      * Creates a new node with the given operation and child.
+     *
      * @param operation the operation for this node.
      * @param applyTo   the node to apply the function to.
      */
-    public UnaryPrefixNode(String operation, TreeNode applyTo){
+    public UnaryNode(String operation, TreeNode applyTo) {
         this.operation = operation;
         this.applyTo = applyTo;
     }
@@ -38,6 +40,7 @@ public class UnaryPrefixNode extends TreeNode {
 
     /**
      * Gets the operation of this node.
+     *
      * @return the operation this node performs.
      */
     public String getOperation() {
@@ -46,6 +49,7 @@ public class UnaryPrefixNode extends TreeNode {
 
     /**
      * Gets the node to which this node's operation applies.
+     *
      * @return the tree node to which the operation will be applied.
      */
     public TreeNode getApplyTo() {

src/main/java/org/nwapw/abacus/window/HistoryTableModel.java

@@ -2,9 +2,7 @@ package org.nwapw.abacus.window;
 
 import org.nwapw.abacus.tree.TreeNode;
 
-import javax.swing.event.TableModelListener;
 import javax.swing.table.AbstractTableModel;
-import javax.swing.table.TableModel;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -31,30 +29,6 @@ public class HistoryTableModel extends AbstractTableModel {
             TreeNode.class,
             String.class
     };
-
-    /**
-     * Class used specifically to hold data about
-     * the previous entries into the calculator.
-     */
-    public static class HistoryEntry {
-        public String input;
-        public TreeNode parsedInput;
-        public String output;
-
-        public HistoryEntry(String input, TreeNode parsedInput, String output){
-            this.input = input;
-            this.parsedInput = parsedInput;
-            this.output = output;
-        }
-
-        Object nthValue(int n){
-            if(n == 0) return input;
-            if(n == 1) return parsedInput;
-            if(n == 2) return output;
-            return null;
-        }
-    }
-
     /**
      * The list of entries.
      */
@@ -69,6 +43,7 @@ public class HistoryTableModel extends AbstractTableModel {
 
     /**
      * Adds an entry to the model.
+     *
      * @param entry the entry to add.
      */
     public void addEntry(HistoryEntry entry) {
@@ -105,4 +80,27 @@ public class HistoryTableModel extends AbstractTableModel {
         return entries.get(rowIndex).nthValue(columnIndex);
     }
 
+    /**
+     * Class used specifically to hold data about
+     * the previous entries into the calculator.
+     */
+    public static class HistoryEntry {
+        public String input;
+        public TreeNode parsedInput;
+        public String output;
+
+        public HistoryEntry(String input, TreeNode parsedInput, String output) {
+            this.input = input;
+            this.parsedInput = parsedInput;
+            this.output = output;
+        }
+
+        Object nthValue(int n) {
+            if (n == 0) return input;
+            if (n == 1) return parsedInput;
+            if (n == 2) return output;
+            return null;
+        }
+    }
+
 }

src/main/java/org/nwapw/abacus/window/Window.java

@@ -146,6 +146,7 @@ public class Window extends JFrame {
 
     /**
      * Creates a new window with the given manager.
+     *
      * @param abacus the calculator instance to interact with other components.
      */
     public Window(Abacus abacus) {
@@ -246,4 +247,9 @@ public class Window extends JFrame {
         });
     }
 
+    @Override
+    public void setVisible(boolean b) {
+        super.setVisible(b);
+        if(b) inputField.requestFocusInWindow();
+    }
 }

src/main/resources/abacus.fxml

@@ -0,0 +1,63 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<?import javafx.geometry.Insets?>
+<?import javafx.scene.control.*?>
+<?import javafx.scene.layout.BorderPane?>
+<?import javafx.scene.layout.VBox?>
+<?import javafx.scene.text.Text?>
+<?import javafx.scene.layout.HBox?>
+<?import javafx.scene.layout.GridPane?>
+<?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">
+            <Tab fx:id="calculateTab" text="Calculator" closable="false">
+                <BorderPane>
+                    <center>
+                        <TableView fx:id="historyTable">
+                            <columnResizePolicy>
+                                <TableView fx:constant="CONSTRAINED_RESIZE_POLICY"/>
+                            </columnResizePolicy>
+                            <columns>
+                                <TableColumn fx:id="inputColumn" text="Input" sortable="false"/>
+                                <TableColumn fx:id="parsedColumn" text="Parsed" sortable="false"/>
+                                <TableColumn fx:id="outputColumn" text="Output" sortable="false"/>
+                            </columns>
+                        </TableView>
+                    </center>
+                    <bottom>
+                        <VBox>
+                            <ScrollPane prefHeight="50" vbarPolicy="NEVER">
+                                <padding>
+                                    <Insets top="10" bottom="10" left="10" right="10"/>
+                                </padding>
+                                <Text fx:id="outputText"/>
+                            </ScrollPane>
+                            <TextField fx:id="inputField" onAction="#performCalculation"/>
+                            <Button fx:id="inputButton" text="Calculate" maxWidth="Infinity"
+                                    onAction="#performCalculation"/>
+                        </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>
+                    <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">
+                        <Button text="Apply" onAction="#performSave"/>
+                        <Button text="Reload Plugins" onAction="#performReload"/>
+                        <Button text="Apply and Reload" onAction="#performSaveAndReload"/>
+                    </FlowPane>
+                </GridPane>
+            </Tab>
+        </TabPane>
+    </center>
+
+</BorderPane>

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

@@ -1,14 +0,0 @@
-package org.nwapw.abacus.config;
-
-/**
- * Serializable class that will be used to load TOML
- * configurations.
- */
-public class Configuration {
-
-    /**
-     * The type of number this calculator should use.
-     */
-    public String numberType;
-
-}

src/org/nwapw/abacus/config/ConfigurationObject.java

@@ -1,105 +0,0 @@
-package org.nwapw.abacus.config;
-
-import com.moandjiezana.toml.Toml;
-import com.moandjiezana.toml.TomlWriter;
-
-import java.io.File;
-import java.io.IOException;
-
-/**
- * A configuration object, which essentially
- * manages saving, loading, and getting values
- * from the configuration. While Configuration is
- * the data model, this is the interface with it.
- */
-public class ConfigurationObject {
-
-    /**
-     * The writer used to store the configuration.
-     */
-    private static final TomlWriter TOML_WRITER = new TomlWriter();
-    /**
-     * The configuration instance being modeled.
-     */
-    private Configuration configuration;
-
-    /**
-     * Sets up the ConfigurationObject.
-     * different constructors do different things,
-     * but they all lead here.
-     * @param configuration the configuration to set up with.
-     */
-    private void setup(Configuration configuration){
-        this.configuration = configuration;
-    }
-
-    /**
-     * Creates a default configuration.
-     * @return the newly created default configuration.
-     */
-    private Configuration getDefaultConfig(){
-        configuration = new Configuration();
-        configuration.numberType = "naive";
-        return configuration;
-    }
-
-    /**
-     * Returns the implementation the user has requested to
-     * represent their numbers.
-     * @return the implementation name.
-     */
-    public String getNumberImplementation() {
-        return configuration.numberType;
-    }
-
-    /**
-     * Saves the ConfigurationObject to the given file.
-     * @param toFile the file to save ot.
-     * @return true if the save succeed, false if otherwise.
-     */
-    public boolean save(File toFile){
-        if(toFile.getParentFile() != null) toFile.getParentFile().mkdirs();
-        try {
-            TOML_WRITER.write(configuration, toFile);
-            return true;
-        } catch (IOException e) {
-            e.printStackTrace();
-        }
-        return false;
-    }
-
-    /**
-     * Creates a new configuration object with the given config.
-     * @param config the config to use.
-     */
-    public ConfigurationObject(Configuration config){
-        setup(config);
-    }
-
-    /**
-     * Create a configuration object by attempting to
-     * load a config from the given path, using the
-     * default configuration otherwise.
-     * @param path the path to attempt to load.
-     */
-    public ConfigurationObject(File path){
-        Configuration config;
-        if(!path.exists()) {
-            config = getDefaultConfig();
-        } else {
-            Toml parse = new Toml();
-            parse.read(path);
-            config = parse.to(Configuration.class);
-        }
-        setup(config);
-    }
-
-    /**
-     * Creates a new configuration object with the
-     * default configuration.
-     */
-    public ConfigurationObject(){
-        setup(getDefaultConfig());
-    }
-
-}

src/org/nwapw/abacus/parsing/TreeBuilder.java

@@ -1,23 +0,0 @@
-package org.nwapw.abacus.parsing;
-
-import org.nwapw.abacus.tree.TreeNode;
-
-import java.util.List;
-
-public class TreeBuilder<T> {
-
-    private Tokenizer<T> tokenizer;
-    private Parser<T> parser;
-
-    public TreeBuilder(Tokenizer<T> tokenizer, Parser<T> parser){
-        this.tokenizer = tokenizer;
-        this.parser = parser;
-    }
-
-    public TreeNode fromString(String input){
-        List<T> tokens = tokenizer.tokenizeString(input);
-        if(tokens == null) return null;
-        return parser.constructTree(tokens);
-    }
-
-}

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

@@ -1,302 +0,0 @@
-package org.nwapw.abacus.plugin;
-
-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 java.util.function.BiFunction;
-
-/**
- * The plugin providing standard functions such as addition and subtraction to
- * the calculator.
- */
-public class StandardPlugin extends Plugin {
-
-    public StandardPlugin(PluginManager manager) {
-        super(manager);
-    }
-
-    @Override
-    public void onEnable() {
-        registerNumber("naive", NaiveNumber.class);
-        registerNumber("precise", PreciseNumber.class);
-
-        registerOperator("+", new Operator(OperatorAssociativity.LEFT, OperatorType.BINARY_INFIX, 0, new Function() {
-            @Override
-            protected boolean matchesParams(NumberInterface[] params) {
-                return params.length >= 1;
-            }
-
-            @Override
-            protected NumberInterface applyInternal(NumberInterface[] params) {
-                NumberInterface sum = params[0];
-                for(int i = 1; i < params.length; i++){
-                    sum = sum.add(params[i]);
-                }
-                return sum;
-            }
-        }));
-
-        registerOperator("-", new Operator(OperatorAssociativity.LEFT, OperatorType.BINARY_INFIX, 0, new Function() {
-            @Override
-            protected boolean matchesParams(NumberInterface[] params) {
-                return params.length == 2;
-            }
-
-            @Override
-            protected NumberInterface applyInternal(NumberInterface[] params) {
-                return params[0].subtract(params[1]);
-            }
-        }));
-
-        registerOperator("*", new Operator(OperatorAssociativity.LEFT, OperatorType.BINARY_INFIX,1, new Function() {
-            @Override
-            protected boolean matchesParams(NumberInterface[] params) {
-                return params.length >= 1;
-            }
-
-            @Override
-            protected NumberInterface applyInternal(NumberInterface[] params) {
-                NumberInterface product = params[0];
-                for(int i = 1; i < params.length; i++){
-                    product = product.multiply(params[i]);
-                }
-                return product;
-            }
-        }));
-
-        registerOperator("/", new Operator(OperatorAssociativity.LEFT, OperatorType.BINARY_INFIX,1, new Function() {
-            @Override
-            protected boolean matchesParams(NumberInterface[] params) {
-                return params.length == 2;
-            }
-
-            @Override
-            protected NumberInterface applyInternal(NumberInterface[] params) {
-                return params[0].divide(params[1]);
-            }
-        }));
-
-        registerOperator("^", 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 StandardPlugin.this.getFunction("exp").apply(StandardPlugin.this.getFunction("ln").apply(params[0]).multiply(params[1]));
-            }
-        }));
-
-        registerOperator("!", new Operator(OperatorAssociativity.RIGHT, OperatorType.UNARY_POSTFIX, 0, new Function() {
-            //private HashMap<Class<? extends NumberInterface>, ArrayList<NumberInterface>> storedList = new HashMap<Class<? extends NumberInterface>, ArrayList<NumberInterface>>();
-            @Override
-            protected boolean matchesParams(NumberInterface[] params) {
-                return params.length == 1;
-            }
-
-            @Override
-            protected NumberInterface applyInternal(NumberInterface[] params) {
-                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){
-                    factorial = factorial.multiply(multiplier);
-                }
-                return factorial;
-                /*if(!storedList.containsKey(params[0].getClass())){
-                    storedList.put(params[0].getClass(), new ArrayList<NumberInterface>());
-                    storedList.get(params[0].getClass()).add(NaiveNumber.ONE.promoteTo(params[0].getClass()));
-                    storedList.get(params[0].getClass()).add(NaiveNumber.ONE.promoteTo(params[0].getClass()));
-                }*/
-            }
-        }));
-
-        registerFunction("abs", new Function() {
-            @Override
-            protected boolean matchesParams(NumberInterface[] params) {
-                return params.length == 1;
-            }
-
-            @Override
-            protected NumberInterface applyInternal(NumberInterface[] params) {
-                return params[0].multiply((new NaiveNumber(params[0].signum())).promoteTo(params[0].getClass()));
-            }
-        });
-
-        registerFunction("exp", new Function() {
-            @Override
-            protected boolean matchesParams(NumberInterface[] params) {
-                return params.length == 1;
-            }
-
-            @Override
-            protected NumberInterface applyInternal(NumberInterface[] params) {
-                boolean takeReciprocal = params[0].signum() == -1;
-                params[0] = StandardPlugin.this.getFunction("abs").apply(params[0]);
-                NumberInterface sum = sumSeries(params[0], StandardPlugin.this::getExpSeriesTerm, getNTermsExp(getMaxError(params[0]), params[0]));
-                if(takeReciprocal){
-                    sum = NaiveNumber.ONE.promoteTo(sum.getClass()).divide(sum);
-                }
-                return sum;
-            }
-        });
-
-        registerFunction("ln", new Function() {
-            @Override
-            protected boolean matchesParams(NumberInterface[] params) {
-                return params.length == 1;
-            }
-
-            @Override
-            protected NumberInterface applyInternal(NumberInterface[] params) {
-                NumberInterface param = params[0];
-                int powersOf2 = 0;
-                while(StandardPlugin.this.getFunction("abs").apply(param.subtract(NaiveNumber.ONE.promoteTo(param.getClass()))).compareTo((new NaiveNumber(0.1)).promoteTo(param.getClass())) >= 0){
-                    if(param.subtract(NaiveNumber.ONE.promoteTo(param.getClass())).signum() == 1) {
-                        param = param.divide(new NaiveNumber(2).promoteTo(param.getClass()));
-                        powersOf2++;
-                        if(param.subtract(NaiveNumber.ONE.promoteTo(param.getClass())).signum() != 1) {
-                            break;
-                            //No infinite loop for you.
-                        }
-                    }
-                    else {
-                        param = param.multiply(new NaiveNumber(2).promoteTo(param.getClass()));
-                        powersOf2--;
-                        if(param.subtract(NaiveNumber.ONE.promoteTo(param.getClass())).signum() != 1) {
-                            break;
-                            //No infinite loop for you.
-                        }
-                    }
-                }
-                return getLog2(param).multiply((new NaiveNumber(powersOf2)).promoteTo(param.getClass())).add(getLogPartialSum(param));
-            }
-
-            /**
-             * Returns the partial sum of the Taylor series for logx (around x=1).
-             * Automatically determines the number of terms needed based on the precision of x.
-             * @param x value at which the series is evaluated. 0 < x < 2. (x=2 is convergent but impractical.)
-             * @return the partial sum.
-             */
-            private NumberInterface getLogPartialSum(NumberInterface x){
-                NumberInterface maxError = StandardPlugin.this.getMaxError(x);
-                x = x.subtract(NaiveNumber.ONE.promoteTo(x.getClass())); //Terms used are for log(x+1).
-                NumberInterface currentTerm = x, sum = x;
-                int n = 1;
-                while(StandardPlugin.this.getFunction("abs").apply(currentTerm).compareTo(maxError) > 0){
-                    n++;
-                    currentTerm = currentTerm.multiply(x).multiply((new NaiveNumber(n-1)).promoteTo(x.getClass())).divide((new NaiveNumber(n)).promoteTo(x.getClass())).negate();
-                    sum = sum.add(currentTerm);
-                }
-                return sum;
-            }
-
-            /**
-             * Returns natural log of 2 to the required precision of the class of number.
-             * @param number a number of the same type as the return type. (Used for precision.)
-             * @return the value of log(2) with the appropriate precision.
-             */
-            private NumberInterface getLog2(NumberInterface number){
-                NumberInterface maxError = StandardPlugin.this.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)
-                //In the following, a=1/3^n, b=1/4^n, c = 1/n.
-                //a is also an error bound.
-                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){
-                    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));
-                }
-                return sum;
-            }
-        });
-
-        registerFunction("sqrt", new Function() {
-            @Override
-            protected boolean matchesParams(NumberInterface[] params) {
-                return params.length == 1;
-            }
-
-            @Override
-            protected NumberInterface applyInternal(NumberInterface[] params) {
-                return StandardPlugin.this.getOperator("^").getFunction().apply(params[0], ((new NaiveNumber(0.5)).promoteTo(params[0].getClass())));
-            }
-        });
-    }
-
-    @Override
-    public void onDisable() {
-
-    }
-
-    /**
-     * Returns the nth term of the Taylor series (centered at 0) of e^x
-     * @param n the term required (n >= 0).
-     * @param x the real number at which the series is evaluated.
-     * @return the nth term of the series.
-     */
-    private NumberInterface getExpSeriesTerm(int n, NumberInterface x){
-        return x.intPow(n).divide(this.getOperator("!").getFunction().apply((new NaiveNumber(n)).promoteTo(x.getClass())));
-    }
-
-    /**
-     * Returns the number of terms needed to evaluate the exponential function (at x)
-     * such that the error is at most maxError.
-     * @param maxError Maximum error permissible (This should probably be positive.)
-     * @param x where the function is evaluated.
-     * @return the number of terms needed to evaluated the exponential function.
-     */
-    private int getNTermsExp(NumberInterface maxError, NumberInterface x) {
-        //We need n such that |x^(n+1)| <= (n+1)! * maxError
-        //The variables LHS and RHS refer to the above inequality.
-        int n = 0;
-        x = this.getFunction("abs").apply(x);
-        NumberInterface LHS = x, RHS = maxError;
-        while (LHS.compareTo(RHS) > 0) {
-            n++;
-            LHS = LHS.multiply(x);
-            RHS = RHS.multiply(new NaiveNumber(n + 1).promoteTo(RHS.getClass()));
-        }
-        return n;
-    }
-
-
-    /**
-     * Returns a partial sum of a series whose terms are given by the nthTermFunction, evaluated at x.
-     * @param x the value at which the series is evaluated.
-     * @param nthTermFunction the function that returns the nth term of the series, in the format term(x, n).
-     * @param n the number of terms in the partial sum.
-     * @return the value of the partial sum that has the same class as x.
-     */
-    private NumberInterface sumSeries(NumberInterface x, BiFunction<Integer, NumberInterface, NumberInterface> nthTermFunction, int n){
-        NumberInterface sum = NaiveNumber.ZERO.promoteTo(x.getClass());
-        for(int i = 0; i <= n; i++){
-            sum = sum.add(nthTermFunction.apply(i, x));
-        }
-        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 NumberInterface getMaxError(NumberInterface number){
-        return (new NaiveNumber(10)).promoteTo(number.getClass()).intPow(-number.getMaxPrecision());
-    }
-
-}

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

@@ -0,0 +1,133 @@
+package org.nwapw.abacus.tests;
+
+import org.junit.Assert;
+import org.junit.Test;
+import org.nwapw.abacus.lexing.Lexer;
+import org.nwapw.abacus.lexing.pattern.Match;
+
+import java.util.List;
+
+public class LexerTests {
+
+    @Test
+    public void testBasicSuccess() {
+        Lexer<Integer> lexer = new Lexer<>();
+        lexer.register("abc", 0);
+        lexer.register("def", 1);
+        List<Match<Integer>> matchedIntegers = lexer.lexAll("abcdefabc", 0, Integer::compare);
+        Assert.assertNotNull(matchedIntegers);
+        Assert.assertEquals(matchedIntegers.get(0).getType(), Integer.valueOf(0));
+        Assert.assertEquals(matchedIntegers.get(1).getType(), Integer.valueOf(1));
+        Assert.assertEquals(matchedIntegers.get(2).getType(), Integer.valueOf(0));
+    }
+
+    @Test
+    public void testBasicFailure() {
+        Lexer<Integer> lexer = new Lexer<>();
+        lexer.register("abc", 0);
+        lexer.register("def", 1);
+        Assert.assertNull(lexer.lexAll("abcdefabcz", 0, Integer::compare));
+    }
+
+    @Test
+    public void testNoPatterns() {
+        Lexer<Integer> lexer = new Lexer<>();
+        Assert.assertNull(lexer.lexAll("abcdefabc", 0, Integer::compare));
+    }
+
+    @Test
+    public void testEmptyMatches() {
+        Lexer<Integer> lexer = new Lexer<>();
+        lexer.register("a?", 0);
+        Assert.assertNull(lexer.lexAll("", 0, Integer::compare));
+    }
+
+    @Test
+    public void testOneOrMore() {
+        Lexer<Integer> lexer = new Lexer<>();
+        lexer.register("a+", 0);
+        List<Match<Integer>> tokens = lexer.lexAll("aaaa", 0, Integer::compare);
+        Assert.assertNotNull(tokens);
+        Assert.assertEquals(tokens.size(), 1);
+    }
+
+    @Test
+    public void testZeroOrMore() {
+        Lexer<Integer> lexer = new Lexer<>();
+        lexer.register("a*", 0);
+        List<Match<Integer>> tokens = lexer.lexAll("aaaa", 0, Integer::compare);
+        Assert.assertNotNull(tokens);
+        Assert.assertEquals(tokens.size(), 1);
+    }
+
+    @Test
+    public void testZeroOrOne() {
+        Lexer<Integer> lexer = new Lexer<>();
+        lexer.register("a?", 0);
+        List<Match<Integer>> tokens = lexer.lexAll("aaaa", 0, Integer::compare);
+        Assert.assertNotNull(tokens);
+        Assert.assertEquals(tokens.size(), 4);
+    }
+
+    @Test
+    public void testGreedyMatching() {
+        Lexer<Integer> lexer = new Lexer<>();
+        lexer.register("a*a", 0);
+        List<Match<Integer>> tokens = lexer.lexAll("aaaa", 0, Integer::compare);
+        Assert.assertNotNull(tokens);
+        Assert.assertEquals(tokens.size(), 1);
+    }
+
+    @Test
+    public void testAnyCharacter() {
+        String testString = "abcdef";
+        Lexer<Integer> lexer = new Lexer<>();
+        lexer.register(".", 0);
+        List<Match<Integer>> tokens = lexer.lexAll(testString, 0, Integer::compare);
+        Assert.assertNotNull(tokens);
+        Assert.assertEquals(tokens.size(), testString.length());
+        for (int i = 0; i < tokens.size(); i++) {
+            Assert.assertEquals(testString.substring(i, i + 1), tokens.get(i).getContent());
+        }
+    }
+
+    @Test
+    public void testBasicGroup() {
+        Lexer<Integer> lexer = new Lexer<>();
+        lexer.register("(abc)", 0);
+        List<Match<Integer>> tokens = lexer.lexAll("abc", 0, Integer::compare);
+        Assert.assertNotNull(tokens);
+        Assert.assertEquals(tokens.size(), 1);
+        Assert.assertEquals(tokens.get(0).getContent(), "abc");
+    }
+
+    @Test
+    public void testBasicRangeSuccess() {
+        String testString = "abcdef";
+        Lexer<Integer> lexer = new Lexer<>();
+        lexer.register("[a-f]", 0);
+        List<Match<Integer>> tokens = lexer.lexAll(testString, 0, Integer::compare);
+        Assert.assertNotNull(tokens);
+        Assert.assertEquals(testString.length(), tokens.size());
+        for (int i = 0; i < tokens.size(); i++) {
+            Assert.assertEquals(testString.substring(i, i + 1), tokens.get(i).getContent());
+        }
+    }
+
+    @Test
+    public void testBasicRangeFailure() {
+        Lexer<Integer> lexer = new Lexer<>();
+        lexer.register("[a-f]", 0);
+        Assert.assertNull(lexer.lexAll("g", 0, Integer::compare));
+    }
+
+    @Test
+    public void testGroupAndOperator() {
+        Lexer<Integer> lexer = new Lexer<>();
+        lexer.register("(abc)+", 0);
+        List<Match<Integer>> tokens = lexer.lexAll("abcabc", 0, Integer::compare);
+        Assert.assertNotNull(tokens);
+        Assert.assertEquals(tokens.size(), 1);
+    }
+
+}

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

@@ -0,0 +1,124 @@
+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.function.Function;
+import org.nwapw.abacus.function.Operator;
+import org.nwapw.abacus.function.OperatorAssociativity;
+import org.nwapw.abacus.function.OperatorType;
+import org.nwapw.abacus.lexing.pattern.Match;
+import org.nwapw.abacus.number.NumberInterface;
+import org.nwapw.abacus.parsing.LexerTokenizer;
+import org.nwapw.abacus.plugin.Plugin;
+import org.nwapw.abacus.tree.TokenType;
+
+import java.util.List;
+
+public class TokenizerTests {
+
+    private static Abacus abacus = new Abacus();
+    private static LexerTokenizer lexerTokenizer = new LexerTokenizer();
+    private static Function subtractFunction = new Function() {
+        @Override
+        protected boolean matchesParams(NumberInterface[] params) {
+            return params.length == 2;
+        }
+
+        @Override
+        protected NumberInterface applyInternal(NumberInterface[] params) {
+            return params[0].subtract(params[1]);
+        }
+    };
+    private static Plugin testPlugin = new Plugin(abacus.getPluginManager()) {
+        @Override
+        public void onEnable() {
+            registerOperator("+", new Operator(OperatorAssociativity.LEFT, OperatorType.BINARY_INFIX,
+                    0, subtractFunction));
+            registerOperator("-", new Operator(OperatorAssociativity.LEFT, OperatorType.BINARY_INFIX,
+                    0, subtractFunction));
+            registerFunction("subtract", subtractFunction);
+        }
+
+        @Override
+        public void onDisable() {
+
+        }
+    };
+
+    private static void assertTokensMatch(List<Match<TokenType>> tokenList, TokenType[] expectedTypes) {
+        Assert.assertNotNull(tokenList);
+        Assert.assertEquals(tokenList.size(), expectedTypes.length);
+        for (int i = 0; i < expectedTypes.length; i++) {
+            Assert.assertEquals(expectedTypes[i], tokenList.get(i).getType());
+        }
+    }
+
+    @BeforeClass
+    public static void prepareTests() {
+        abacus.getPluginManager().addListener(lexerTokenizer);
+        abacus.getPluginManager().addInstantiated(testPlugin);
+        abacus.getPluginManager().load();
+    }
+
+    @Test
+    public void testInteger() {
+        assertTokensMatch(lexerTokenizer.tokenizeString("11"), new TokenType[]{TokenType.NUM});
+    }
+
+    @Test
+    public void testLeadingZeroDecimal() {
+        assertTokensMatch(lexerTokenizer.tokenizeString("0.1"), new TokenType[]{TokenType.NUM});
+    }
+
+    @Test
+    public void testNonLeadingDecimal() {
+        assertTokensMatch(lexerTokenizer.tokenizeString(".1"), new TokenType[]{TokenType.NUM});
+    }
+
+    @Test
+    public void testSimpleChars() {
+        TokenType[] types = {
+                TokenType.OPEN_PARENTH,
+                TokenType.WHITESPACE,
+                TokenType.COMMA,
+                TokenType.CLOSE_PARENTH
+        };
+        assertTokensMatch(lexerTokenizer.tokenizeString("( ,)"), types);
+    }
+
+    @Test
+    public void testFunctionParsing() {
+        TokenType[] types = {
+                TokenType.FUNCTION,
+                TokenType.OPEN_PARENTH,
+                TokenType.NUM,
+                TokenType.COMMA,
+                TokenType.NUM,
+                TokenType.CLOSE_PARENTH
+        };
+        assertTokensMatch(lexerTokenizer.tokenizeString("subtract(1,2)"), types);
+    }
+
+    @Test
+    public void testOperatorParsing() {
+        TokenType[] types = {
+                TokenType.NUM,
+                TokenType.OP,
+                TokenType.NUM
+        };
+        assertTokensMatch(lexerTokenizer.tokenizeString("1-1"), types);
+    }
+
+    @Test
+    public void testSanitizedOperators() {
+        TokenType[] types = {
+                TokenType.NUM,
+                TokenType.OP,
+                TokenType.NUM
+        };
+        assertTokensMatch(lexerTokenizer.tokenizeString("1+1"), types);
+    }
+
+}