now you can enter an expression and create a circuit representing the expression.

src/main/java/de/neemann/digital/gui/Main.java

@@ -24,6 +24,7 @@ import de.neemann.digital.draw.model.RealTimeClock;
 import de.neemann.digital.draw.shapes.ShapeFactory;
 import de.neemann.digital.gui.components.*;
 import de.neemann.digital.gui.components.data.DataSetDialog;
+import de.neemann.digital.gui.components.expression.ExpressionDialog;
 import de.neemann.digital.gui.components.listing.ROMListingDialog;
 import de.neemann.digital.gui.components.table.TableDialog;
 import de.neemann.digital.gui.remote.DigitalHandler;
@@ -538,6 +539,16 @@ public class Main extends JFrame implements ClosingWindowListener.ConfirmSave, E
         }
                 .setToolTip(Lang.get("menu_synthesise_tt"))
                 .createJMenuItem());
+
+        analyse.add(new ToolTipAction(Lang.get("menu_expression")) {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                new ExpressionDialog(Main.this, shapeFactory).setVisible(true);
+            }
+        }
+                .setToolTip(Lang.get("menu_expression_tt"))
+                .createJMenuItem());
+
     }
 
     private void orderMeasurements() {

src/main/java/de/neemann/digital/gui/components/expression/ExpressionDialog.java

@@ -0,0 +1,57 @@
+package de.neemann.digital.gui.components.expression;
+
+import de.neemann.digital.analyse.expression.Expression;
+import de.neemann.digital.analyse.parser.Parser;
+import de.neemann.digital.builder.circuit.CircuitBuilder;
+import de.neemann.digital.draw.elements.Circuit;
+import de.neemann.digital.draw.shapes.ShapeFactory;
+import de.neemann.digital.gui.Main;
+import de.neemann.digital.lang.Lang;
+import de.neemann.gui.ErrorMessage;
+import de.neemann.gui.ToolTipAction;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.ActionEvent;
+
+/**
+ * Dialog to enter an expression
+ * @author hneemann
+ */
+public class ExpressionDialog extends JDialog {
+
+    /**
+     * Creates a new instance
+     *
+     * @param parent       the parent
+     * @param shapeFactory the shapeFactory used for new circuits
+     */
+    public ExpressionDialog(JFrame parent, ShapeFactory shapeFactory) {
+        super(parent, Lang.get("expression"), false);
+
+        JTextField text = new JTextField("(C ∨ B) ∧ (A ∨ C) ∧ (B ∨ !C) * (C + !A)", 40);
+        getContentPane().add(text, BorderLayout.CENTER);
+        getContentPane().add(new JLabel(Lang.get("msg_enterAnExpression")), BorderLayout.NORTH);
+
+        JPanel buttons = new JPanel(new FlowLayout(FlowLayout.RIGHT));
+        getContentPane().add(buttons, BorderLayout.SOUTH);
+
+        buttons.add(new ToolTipAction(Lang.get("btn_create")) {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                try {
+                    Expression exp = new Parser(text.getText()).parse();
+                    CircuitBuilder circuitBuilder = new CircuitBuilder(shapeFactory);
+                    circuitBuilder.addCombinatorial("Y", exp);
+                    Circuit circuit = circuitBuilder.createCircuit();
+                    SwingUtilities.invokeLater(() -> new Main(null, circuit).setVisible(true));
+                } catch (Exception ex) {
+                    new ErrorMessage().addCause(ex).show(ExpressionDialog.this);
+                }
+            }
+        }.setToolTip(Lang.get("btn_create_tt")).createJButton());
+
+        pack();
+        setLocationRelativeTo(parent);
+    }
+}

src/main/java/de/neemann/digital/gui/components/expression/package-info.java

@@ -0,0 +1,6 @@
+/**
+ * Classes needed to enter an expression and to create a circuit representing the expression
+ *
+ * @author hneemann
+ */
+package de.neemann.digital.gui.components.expression;

src/main/resources/lang/lang_de.xml

@@ -12,8 +12,11 @@
     <string name="btn_reload">Neu Laden</string>
     <string name="btn_reload_tt">Letzte Datei noch einmal laden</string>
     <string name="btn_save">Speichern</string>
+    <string name="btn_create">Erzeugen</string>
+    <string name="btn_create_tt">Erzeugt eine Schaltung in einem eigenen Fenster.</string>
     <string name="cancel">Abbrechen</string>
     <string name="digital">Digital</string>
+    <string name="expression">Ausdruck</string>
     <string name="elem_Add">Addierer</string>
     <string name="elem_And">Und</string>
     <string name="elem_Break">Break</string>
@@ -312,6 +315,8 @@ Zur Analyse können Sie die Schaltung im Gatterschrittmodus ausführen.</string>
     <string name="menu_view">Ansicht</string>
     <string name="menu_zoomIn">Vergrößern</string>
     <string name="menu_zoomOut">Verkleinern</string>
+    <string name="menu_expression">Ausdruck</string>
+    <string name="menu_expression_tt">Erzeugt eine Schaltung aus einem Ausdruck.</string>
     <string name="message">Digital
 
 Ein einfacher Simulator für digitale Schaltkreise.
@@ -339,6 +344,7 @@ Geschrieben von Helmut Neemann 2016</string>
     <string name="msg_pinMap_pin_N_is_N">Pin {0}: {1}</string>
     <string name="msg_restartNeeded">Die Änderung erfordert einen Neustart!</string>
     <string name="msg_noRomFound">Kein ROM im Model gefunden! Im ROM muss Automatisches Laden eingeschaltet sein!</string>
+    <string name="msg_enterAnExpression">Geben Sie einen Ausdruck ein:</string>
     <string name="ok">Ok</string>
     <string name="rot_0">0°</string>
     <string name="rot_180">180°</string>

src/main/resources/lang/lang_en.xml

@@ -12,8 +12,11 @@
     <string name="btn_reload">Reload</string>
     <string name="btn_reload_tt">Reload last hex file</string>
     <string name="btn_save">Save</string>
+    <string name="btn_create">Create</string>
+    <string name="btn_create_tt">Create a circuit in a seperate window</string>
     <string name="cancel">Cancel</string>
     <string name="digital">Digital</string>
+    <string name="expression">Expression</string>
     <string name="elem_Add">Add</string>
     <string name="elem_And">And</string>
     <string name="elem_Break">Break</string>
@@ -312,6 +315,8 @@ To analyse you can run the circuit in single gate step mode.</string>
     <string name="menu_view">View</string>
     <string name="menu_zoomIn">Zoom In</string>
     <string name="menu_zoomOut">Zoom Out</string>
+    <string name="menu_expression">Expression</string>
+    <string name="menu_expression_tt">Create a circuit from an expression.</string>
     <string name="message">Digital
 
 A simple simulator for digital circuits.
@@ -339,6 +344,7 @@ Written bei H.Neemann in 2016</string>
     <string name="msg_noRomFound">No ROM found! ROM needs to be set to auto reload mode.</string>
     <string name="msg_errorFileNotFound">Could not find file: {0}</string>
     <string name="msg_remoteUnknownCommand">Command {0} unknown!</string>
+    <string name="msg_enterAnExpression">Enter an expression:</string>
     <string name="ok">Ok</string>
     <string name="rot_0">0°</string>
     <string name="rot_180">180°</string>