Fix code style issues

src/main/java/edu/kit/typicalc/model/Conclusion.java

@@ -25,7 +25,7 @@ public class Conclusion {
      * @param lambdaTerm the lambda term in the conclusion
      * @param type the type assigned to the lambda term in the conclusion
      */
-    protected Conclusion(Map<VarTerm, TypeAbstraction> typeAssumptions, LambdaTerm lambdaTerm, Type type) {
+    public Conclusion(Map<VarTerm, TypeAbstraction> typeAssumptions, LambdaTerm lambdaTerm, Type type) {
         this.typeAssumptions = typeAssumptions;
         this.lambdaTerm = lambdaTerm;
         this.type = type;

src/main/java/edu/kit/typicalc/model/parser/LambdaLexer.java

@@ -111,20 +111,21 @@ public class LambdaLexer {
                 advance();
                 return new Result<>(t);
             default:
-                if (Character.isLetter(c)) {
+                // only allow ascii characters in variable names
+                if (Character.isLetter(c) && (int) c < 128) {
                     int startPos = pos;
                     // identifier
                     StringBuilder sb = new StringBuilder();
                     do {
                         sb.append(term.charAt(pos));
                         advance();
-                    } while (pos < term.length() && Character.isLetterOrDigit(term.charAt(pos)));
-                    String s = sb.toString();
-                    TokenType type;
-                    // only allow ascii characters in variable names
-                    if (!s.matches("\\A\\p{ASCII}*\\z")) {
+                    } while (pos < term.length() && Character.isLetterOrDigit(term.charAt(pos))
+                            && (int) term.charAt(pos) < 128);
+                    if (pos < term.length() && (int) term.charAt(pos) >= 128) {
                         return new Result<>(null, ParseError.UNEXPECTED_CHARACTER);
                     }
+                    String s = sb.toString();
+                    TokenType type;
                     switch (s) {
                         case "let":
                             type = TokenType.LET;

src/main/java/edu/kit/typicalc/model/parser/TypeAssumptionParser.java

@@ -40,7 +40,6 @@ public class TypeAssumptionParser {
     }
 
     private Result<Pair<Type, Integer>, ParseError> parseType(LambdaLexer lexer, int parenCount) {
-        // TODO: remove misc. logging
         Result<Token, ParseError> token = lexer.nextToken();
         if (token.isError()) {
             return new Result<>(token);

src/main/java/edu/kit/typicalc/model/step/EmptyStep.java

@@ -2,6 +2,10 @@ package edu.kit.typicalc.model.step;
 
 import edu.kit.typicalc.model.Conclusion;
 import edu.kit.typicalc.model.Constraint;
+import edu.kit.typicalc.model.term.VarTerm;
+import edu.kit.typicalc.model.type.NamedType;
+
+import java.util.Collections;
 
 /**
  * Empty steps are used if the sub-inference that is started when creating a let step failed and the second premise of
@@ -13,7 +17,10 @@ public class EmptyStep extends InferenceStep {
      * Initializes a new empty step.
      */
     public EmptyStep() {
-        super(null, null); // TODO
+        super(
+                new Conclusion(Collections.emptyMap(), new VarTerm(""), new NamedType("")),
+                new Constraint(new NamedType(""), new NamedType(""))
+        ); // TODO: better dummy parameters?
     }
 
     @Override

src/main/java/edu/kit/typicalc/model/type/UnificationUtil.java

@@ -11,6 +11,8 @@ import java.util.Optional;
 
 /**
  * Utility class to avoid unification logic duplication in type methods.
+ *
+ * @see Type
  */
 final class UnificationUtil {
     private UnificationUtil() { }

src/main/java/edu/kit/typicalc/view/MathjaxAdapter.java

@@ -3,13 +3,12 @@ package edu.kit.typicalc.view;
 /**
  * Represents an HTML element that uses MathJax and custom JavaScript classes to render its contents.
  * Provides an interface between Java code and said JavaScript classes. Allows to reveal parts of the
- * rendered LaTeX step-by-step. Allows for scaling of the rendered LaTeX.
+ * rendered LaTeX step-by-step.
  */
 public interface MathjaxAdapter {
 
     int getStepCount();
 
     void showStep(int n);
-
-    void scale(double newScaling);
+    // TODO: document removal of scaling method
 }

src/main/java/edu/kit/typicalc/view/content/ControlPanel.java

@@ -23,6 +23,7 @@ public class ControlPanel extends HorizontalLayout {
      * Sets up buttons with click-listeners that call the corresponding method in the view.
      *
      * @param view the view that reacts to the button clicks
+     * @param focusArea the component key shortcuts should work in
      */
     public ControlPanel(ControlPanelView view, Component focusArea) {
         firstStep = new Button(new Icon(VaadinIcon.ANGLE_DOUBLE_LEFT), evt -> view.firstStepButton());

src/main/java/edu/kit/typicalc/view/content/typeinferencecontent/MathjaxProofTree.java

@@ -50,10 +50,5 @@ public class MathjaxProofTree extends LitTemplate implements MathjaxAdapter {
     public void showStep(int n) {
         getElement().callJsFunction("showStep", n);
     }
-
-    @Override
-    public void scale(double newScaling) {
-
-    }
 }
 

src/main/java/edu/kit/typicalc/view/content/typeinferencecontent/MathjaxUnification.java

@@ -46,10 +46,5 @@ public class MathjaxUnification extends LitTemplate implements MathjaxAdapter {
         }
         getElement().callJsFunction("showStep", n);
     }
-
-    @Override
-    public void scale(double newScaling) {
-        // todo implement
-    }
 }
 

src/main/java/edu/kit/typicalc/view/content/typeinferencecontent/ShareDialog.java

@@ -14,7 +14,6 @@ import com.vaadin.flow.i18n.LocaleChangeObserver;
  */
 public class ShareDialog extends Dialog implements LocaleChangeObserver {
 
-    private final VerticalLayout layout;
     private final TextField urlField;
     private final TextField packageField;
     private final TextArea latexArea;
@@ -29,7 +28,7 @@ public class ShareDialog extends Dialog implements LocaleChangeObserver {
      */
     public ShareDialog(String url, String latexPackages, String latexCode) {
         setWidth(80, Unit.PERCENTAGE);
-        layout = new VerticalLayout();
+        VerticalLayout layout = new VerticalLayout();
         layout.setAlignItems(FlexComponent.Alignment.START);
         layout.setSizeFull();
         add(layout);

src/main/java/edu/kit/typicalc/view/content/typeinferencecontent/TypeInferenceView.java

@@ -31,21 +31,18 @@ public class TypeInferenceView extends VerticalLayout
 
     private MathjaxUnification unification;
     private MathjaxProofTree tree;
-    private final LatexCreator lc;
-    private final transient TypeInfererInterface typeInferer;
+    private final transient LatexCreator lc;
     private final Div content;
-    private final ControlPanel controlPanel;
-    private ShareDialog shareDialog;
+    private final ShareDialog shareDialog;
 
     public TypeInferenceView(TypeInfererInterface typeInferer) {
-        this.typeInferer = typeInferer;
         setId(ID);
         setSizeFull();
         addAttachListener(this);
         lc = new LatexCreator(typeInferer);
         content = new Div();
         content.setId(CONTENT_ID);
-        controlPanel = new ControlPanel(this, this);
+        ControlPanel controlPanel = new ControlPanel(this, this);
         Scroller scroller = new Scroller(content);
         scroller.setId(SCROLLER_ID);
         scroller.setScrollDirection(Scroller.ScrollDirection.BOTH);

src/main/java/edu/kit/typicalc/view/main/ErrorNotification.java

@@ -9,15 +9,15 @@ import com.vaadin.flow.component.orderedlayout.VerticalLayout;
 
 public class ErrorNotification extends Notification {
 
-    private static final long serialVersionUID = 1L;
-    
+    private static final long serialVersionUID = 239587L;
+
     private static final String NOTIFICATION_ID = "errorNotification";
 
     protected ErrorNotification(final String errorMessage) {
         final VerticalLayout container = new VerticalLayout();
         final Span errorSpan = new Span(errorMessage);
         final Button closeButton = new Button(getTranslation("root.close"), event -> this.close());
-        
+
         container.add(errorSpan, closeButton);
         container.setAlignItems(FlexComponent.Alignment.CENTER);
         addThemeVariants(NotificationVariant.LUMO_ERROR);

src/main/java/edu/kit/typicalc/view/main/InferenceRuleField.java

@@ -14,15 +14,15 @@ import com.vaadin.flow.i18n.LocaleChangeObserver;
 
 /**
  * Visual representation of an inference rule. The component is composed of the rule itself (displayed
- * in LaTeX rendered by MathJax), the name of the rule and a button to copy the LaTeX-code to the 
+ * in LaTeX rendered by MathJax), the name of the rule and a button to copy the LaTeX-code to the
  * clipboard. Each InferenceRuleField is displayed in drawer area of the web page.
  */
 @CssImport("./styles/view/main/inference-rule-field.css")
 @JsModule("./src/copy-to-clipboard.js")
 public class InferenceRuleField extends VerticalLayout implements LocaleChangeObserver {
-    
+
     private static final long serialVersionUID = -8551851183297707985L;
-    
+
     /*
      * IDs for the imported .css-file
      */
@@ -30,32 +30,32 @@ public class InferenceRuleField extends VerticalLayout implements LocaleChangeOb
     private static final String HEADER_ID = "headerField";
     private static final String MAIN_ID = "main";
     private static final String RULE_NAME_ID = "ruleName";
-    
+
     private final String nameKey;
     private final Button copyButton;
     private final H4 ruleName;
-    private final MathjaxDisplay rule;
-    
+
     /**
      * Initializes an InferenceRuleField with a key to get the name of the inference rule and the LaTeX-code
      * for its visual representation.
-     * 
+     *
      * @param latex the LaTeX-code
      * @param nameKey the key to get the name of the inference rule
      */
     protected InferenceRuleField(final String latex, final String nameKey) {
         this.nameKey = nameKey;
-        
+
         final HorizontalLayout header = new HorizontalLayout();
         header.setId(HEADER_ID);
         this.ruleName = new H4(getTranslation(nameKey));
         ruleName.setId(RULE_NAME_ID);
         header.add(ruleName);
-        
+
         final VerticalLayout main = new VerticalLayout();
         main.setId(MAIN_ID);
         this.copyButton = new Button(getTranslation("root.copyLatex"), new Icon(VaadinIcon.CLIPBOARD));
-        this.rule = new MathjaxDisplay(latex); //TODO scale, when method implemented
+        MathjaxDisplay rule = new MathjaxDisplay(latex); //TODO scale, when method implemented
+        // TODO: scale to what exactly?
         copyButton.addClickListener(event -> UI.getCurrent().getPage().executeJs("window.copyToClipboard($0)", latex));
         main.add(rule, copyButton);
         add(header, main);

src/main/java/edu/kit/typicalc/view/main/InfoDialog.java

@@ -9,13 +9,12 @@ import com.vaadin.flow.i18n.LocaleChangeEvent;
 import com.vaadin.flow.i18n.LocaleChangeObserver;
 
 /**
- * Dialog which contains information on the correct syntax for the users input. 
+ * Dialog which contains information on the correct syntax for the users input.
  */
 @CssImport("./styles/view/main/info-dialog.css")
 public class InfoDialog extends Dialog implements LocaleChangeObserver {
-    
     private static final long serialVersionUID = 2914411566361539614L;
-    
+
     /*
      * IDs for the imported .css-file
      */
@@ -23,7 +22,7 @@ public class InfoDialog extends Dialog implements LocaleChangeObserver {
     private static final String INFO_CONTENT_ID = "infoContent";
 
     private final H4 heading;
-    
+
     /**
      * Creates new InfoDialog.
      */
@@ -31,7 +30,7 @@ public class InfoDialog extends Dialog implements LocaleChangeObserver {
         heading = new H4(getTranslation("root.inputSyntax"));
         HorizontalLayout infoHeader = new HorizontalLayout(heading);
         infoHeader.setId(INFO_HEADER_ID);
-        
+
         //TODO fill with content
         VerticalLayout infoContent = new VerticalLayout();
         infoContent.setId(INFO_CONTENT_ID);

src/main/java/edu/kit/typicalc/view/main/InputBar.java

@@ -35,9 +35,6 @@ public class InputBar extends HorizontalLayout implements LocaleChangeObserver {
 
     private static final short MAX_INPUT_LENGTH = 1000;
 
-    private final Icon infoIcon;
-    private final Button exampleButton;
-    private final Button lambdaButton;
     private final TextField inputField;
     private final Button inferTypeButton;
 
@@ -48,7 +45,7 @@ public class InputBar extends HorizontalLayout implements LocaleChangeObserver {
      * @param callback Consumer to call the inferType()-method in UpperBar
      */
     protected InputBar(final Consumer<String> callback) {
-        infoIcon = new Icon(VaadinIcon.INFO_CIRCLE);
+        Icon infoIcon = new Icon(VaadinIcon.INFO_CIRCLE);
         infoIcon.addClickListener(event -> onInfoIconClick());
 
         inputField = new TextField();
@@ -56,8 +53,8 @@ public class InputBar extends HorizontalLayout implements LocaleChangeObserver {
         inputField.setClearButtonVisible(true);
         inputField.setValueChangeMode(ValueChangeMode.EAGER);
         inputField.addValueChangeListener(event -> onInputFieldValueChange());
-        lambdaButton = new Button(getTranslation("root.lambda"), event -> onLambdaButtonClick());
-        exampleButton = new Button(getTranslation("root.examplebutton"), event -> onExampleButtonClick());
+        Button lambdaButton = new Button(getTranslation("root.lambda"), event -> onLambdaButtonClick());
+        Button exampleButton = new Button(getTranslation("root.examplebutton"), event -> onExampleButtonClick());
         exampleButton.setId(EXAMPLE_BUTTON_ID);
         inferTypeButton = new Button(getTranslation("root.typeInfer"), event -> onTypeInferButtonClick(callback));
         inferTypeButton.addClickShortcut(Key.ENTER).listenOn(this);
@@ -67,10 +64,10 @@ public class InputBar extends HorizontalLayout implements LocaleChangeObserver {
         add(infoIcon, exampleButton, lambdaButton, inputField, inferTypeButton);
         setId(INPUT_BAR_ID);
     }
-    
+
     /**
      * Sets the provided string as the value of the inputField and starts the type inference algorithm.
-     * 
+     *
      * @param term the provided string
      */
     protected void inferTerm(final String term) {

src/main/java/edu/kit/typicalc/view/main/MathjaxDisplay.java

@@ -36,10 +36,5 @@ public class MathjaxDisplay extends LitTemplate implements MathjaxAdapter {
     public void showStep(int n) {
         // do nothing
     }
-
-    @Override
-    public void scale(double newScaling) {
-        // todo implement
-    }
 }