GameLogic and GameState

* add Entity system
* add Action system
* implement first draft of TakeFrom, Open, and GoDirection actions

.gitignore

@@ -1,2 +1,3 @@
 target
 .idea
+.vscode

pom.xml

@@ -3,6 +3,10 @@
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
+    <properties>
+        <maven.compiler.source>17</maven.compiler.source>
+        <maven.compiler.target>17</maven.compiler.target>
+    </properties>
 
     <groupId>schmaeddes</groupId>
     <artifactId>untitledTextAdventure</artifactId>

src/main/java/Main.java

@@ -1,30 +1,24 @@
+import java.io.IOException;
+
+import game.logic.GameLogic;
+import game.logic.Parser;
+import game.state.CircularLocationException;
 import startup.Environment;
 import startup.LoadStuff;
 
-import java.util.Arrays;
-import java.util.List;
-import java.util.Locale;
-import java.util.Scanner;
-
 public class Main {
-
-    public static Environment environment = new Environment();
-    public static Parser parser = new Parser();
-
-    public static void main(String[] args) {
+    public static void main(String[] args) throws IOException {
 
         LoadStuff loadStuff = new LoadStuff();
-        loadStuff.load(environment);
-
-        String greenPrompt = TextColors.BLUE.colorize(">");
-        Scanner scanner = new Scanner(System.in);
-
-        while(true) {
-            System.out.printf("%s ", greenPrompt);
-            List<String> input = Arrays.stream(scanner.nextLine().split(" ")).map(o -> o.toLowerCase(Locale.ROOT)).toList();
-
-            parser.parse(input);
-        }
+        loadStuff.load(Environment.instance);
 
+        Parser parser = new Parser();
+        try (GameLogic logic = new GameLogic(parser)) {
+            logic.loadGameState("games/damnCoolTextAdventureFTW.json");
+            logic.mainLoop();
+        } catch (CircularLocationException ex) {
+            System.err.println("You messed up you game state: " + ex.getMessage());
+            ex.printStackTrace();
+        }
     }
 }

src/main/java/Parser.java

@@ -1,14 +0,0 @@
-import java.util.List;
-
-public class Parser {
-
-    public void parse(List<String> parameter) {
-        String command = parameter.get(0);
-
-            switch (command) {
-                case "go" -> Commands.go(Main.environment.getAreaByString(parameter.get(1)));
-                case "info" -> Commands.info();
-            }
-
-    }
-}

src/main/java/game/logic/EntityDescription.java

@@ -0,0 +1,27 @@
+package game.logic;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+public class EntityDescription {
+    private final List<String> words;
+
+    public EntityDescription(List<String> words) {
+        this.words = new ArrayList<>(words);
+    }
+
+    public String getMainWord() {
+        // TODO enities made up from multiple words. E.g., flat earth conspiracy
+        return this.words.get(this.words.size() - 1);
+    }
+
+    public List<String> getAttributes() {
+        return Collections.unmodifiableList(this.words.subList(0, this.words.size() - 1));
+    }
+
+    @Override
+    public String toString() {
+        return String.join(" ", this.words);
+    }
+}

src/main/java/game/logic/GameLogic.java

@@ -0,0 +1,169 @@
+package game.logic;
+
+import java.io.Closeable;
+import java.io.IOException;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.function.Predicate;
+
+import game.logic.actionsystem.Action;
+import game.logic.actionsystem.actions.GoDirection;
+import game.logic.actionsystem.actions.Open;
+import game.logic.actionsystem.actions.TakeFrom;
+import game.state.CircularLocationException;
+import game.state.Entity;
+import game.state.EntitySet;
+import game.state.GameState;
+
+public class GameLogic implements Closeable {
+    private final Parser parser;
+    private GameState state;
+    private Entity player;
+    private boolean discontinue = false;
+
+    public GameLogic(Parser parser) {
+        this.parser = parser;
+        this.state = new GameState();
+    }
+
+    public void loadGameState(String stateDescJsonFilePath) throws CircularLocationException {
+        ////////////////////////////////////////////////////////////////////////
+        // TODO setup code, load from json or so
+        ////////////////////////////////////////////////////////////////////////
+
+        // final String NORTH = "north";
+        // final String SOUTH = "south";
+        final String EAST = "east";
+        final String WEST = "west";
+        final String INSIDE = "inside";
+        final String OUTSIDE = "outside";
+
+        Entity forestPath01 = this.state.createEntity("forest_path_01");
+        Entity clearing = this.state.createEntity("clearing");
+        Entity houseOutside = this.state.createEntity("house_outside");
+        Entity houseInside = this.state.createEntity("house_inside");
+        Entity houseMainDoor = this.state.createEntity("house_main_door");
+        houseMainDoor.setClosed(true);
+
+        forestPath01.connectBidirectional(EAST, null, WEST, clearing);
+        forestPath01.connectBidirectional(WEST, null, EAST, houseOutside);
+        houseOutside.connectBidirectional(INSIDE, houseMainDoor, OUTSIDE, houseInside);
+
+        this.player = this.state.createEntity("player");
+        Entity apple01 = this.state.createEntity("apple_01", "green");
+        Entity apple02 = this.state.createEntity("apple_02", "red");
+
+        this.player.setLocation(clearing);
+        apple01.setLocation(forestPath01);
+        apple02.setLocation(forestPath01);
+
+        ////////////////////////////////////////////////////////////////////////
+        // TODO game specific action parsers
+        ////////////////////////////////////////////////////////////////////////
+
+        this.parser.pushActionParser(userInput -> userInput.get(0).equals("go")
+                ? new GoDirection(userInput.size() < 2 ? null : userInput.get(1))
+                : null);
+        this.parser.pushActionParser(userInput -> {
+            if (userInput.get(0).equals("take")) {
+                int fromIdx = userInput.indexOf("from");
+                List<EntityDescription> whatToTake = this
+                        .parseDescriptionList(userInput.subList(1, fromIdx == -1 ? userInput.size() : fromIdx));
+                List<EntityDescription> whereToTakeFrom = fromIdx == -1 ? null
+                        : this.parseDescriptionList(userInput.subList(fromIdx + 1, userInput.size()));
+                return new TakeFrom(whatToTake, whereToTakeFrom);
+            } else {
+                return null;
+            }
+        });
+        this.parser.pushActionParser(userInput -> {
+            if (userInput.get(0).equals("open")) {
+                return new Open(this.parseDescriptionList(userInput.subList(1, userInput.size())));
+            } else {
+                return null;
+            }
+        });
+    }
+
+    public Entity getPlayer() {
+        return this.player;
+    }
+
+    public EntitySet searchForEntity(EntityDescription description) {
+        return this.state.searchForEntity(description);
+    }
+
+    public EntitySet searchForEntity(EntityDescription description, Predicate<Entity> acceptFunction) {
+        return this.state.searchForEntity(description).getFiltered(acceptFunction);
+    }
+
+    public EntitySet searchForNearbyEntity(EntityDescription description) {
+        return this.searchForEntity(description, e -> {
+            if (this.player == null) {
+                return false;
+            } else if (this.player.contains(e, false)) {
+                return true;
+            } else if (this.player.getLocation() != null && this.player.getLocation().contains(e, false)) {
+                return true;
+            } else {
+                for (Entity.EntityConnection c : this.player.getLocation().getConnections().stream()
+                        .map(this.player.getLocation()::getConnection).toList()) {
+                    if (c.associatedEntity() == e) {
+                        return true;
+                    }
+                }
+            }
+            return false;
+        });
+    }
+
+    public void mainLoop() {
+        while (!this.discontinue) {
+            Action action = this.parser.readAction();
+            if (action != null) {
+                action.execute(this);
+            }
+        }
+    }
+
+    private List<EntityDescription> parseDescriptionList(List<String> words) {
+        List<EntityDescription> descriptions = new LinkedList<>();
+        List<String> desc = new LinkedList<>();
+        for (String word : words) {
+            if (word.equals("and")) {
+                descriptions.add(new EntityDescription(desc));
+                desc = new LinkedList<>();
+            } else {
+                desc.add(word);
+            }
+        }
+        if (!desc.isEmpty()) {
+            descriptions.add(new EntityDescription(desc));
+        }
+        return descriptions;
+    }
+
+    public void printToUser(String messageId, Object... args) {
+        System.out.print(messageId);
+        for (int i = 0; i < args.length; ++i) {
+            System.out.print(i == 0 ? " " : ", ");
+            System.out.print(args[i]);
+        }
+        System.out.println();
+    }
+
+    public boolean canPlayerOpen(Entity entity) {
+        // TODO
+        return true;
+    }
+
+    public boolean canPlayerTake(Entity entity) {
+        // TODO
+        return true;
+    }
+
+    @Override
+    public void close() throws IOException {
+        this.parser.close();
+    }
+}

src/main/java/game/logic/Parser.java

@@ -0,0 +1,51 @@
+package game.logic;
+
+import java.io.Closeable;
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Scanner;
+
+import game.logic.actionsystem.Action;
+import game.logic.actionsystem.ActionParser;
+import startup.Environment;
+import util.Commands;
+import util.TextColors;
+
+public class Parser implements Closeable {
+    private final Scanner scanner = new Scanner(System.in);
+    private final List<ActionParser> actionParsers = new LinkedList<>();
+
+    public Action readAction() {
+        String greenPrompt = TextColors.BLUE.colorize(">");
+        System.out.printf("%s ", greenPrompt);
+        List<String> input = Arrays.stream(scanner.nextLine().split("\\s+")).map(String::toLowerCase).toList();
+
+        for (ActionParser actionParser : this.actionParsers) {
+            Action action = actionParser.parseAction(input);
+            if (action != null) {
+                return action;
+            }
+        }
+        return null;
+    }
+
+    public void parse(List<String> parameter) {
+        String command = parameter.get(0);
+
+        switch (command) {
+            case "go" -> Commands.go(Environment.instance.getAreaByString(parameter.get(1)));
+            case "info" -> Commands.info();
+        }
+    }
+
+    public void pushActionParser(ActionParser actionParser) {
+        this.actionParsers.add(actionParser);
+    }
+
+    @Override
+    public void close() throws IOException {
+        this.scanner.close();
+    }
+}

src/main/java/game/logic/actionsystem/Action.java

@@ -0,0 +1,22 @@
+package game.logic.actionsystem;
+
+import game.logic.GameLogic;
+
+public abstract class Action {
+    public enum Type {
+        TAKE, DROP,
+        COMBINE_WITH, USE,
+        GIVE_TO, TAKE_FROM,
+        PUT_ON,
+        PUSH, PULL, ROLL, ROLL_TO,
+        TRACE_RAY_TO,
+        KILL, KILL_WITH,
+        SEARCH, SEARCH_FOR,
+        TALK_TO, TELL_TO, ANNOY,
+        LOOK_AT, EXAMINE, READ, WRITE_ON_WITH,
+        HIT, HIT_WITH,
+        GO_TO,
+    }
+
+    public abstract void execute(GameLogic logic);
+}

src/main/java/game/logic/actionsystem/ActionParser.java

@@ -0,0 +1,7 @@
+package game.logic.actionsystem;
+
+import java.util.List;
+
+public interface ActionParser {
+    public Action parseAction(List<String> userInput);
+}

src/main/java/game/logic/actionsystem/actions/GoDirection.java

@@ -0,0 +1,44 @@
+package game.logic.actionsystem.actions;
+
+import game.logic.GameLogic;
+import game.logic.actionsystem.Action;
+import game.state.CircularLocationException;
+import game.state.Entity;
+
+public class GoDirection extends Action {
+    private final String directionId;
+
+    public GoDirection(String directionId) {
+        this.directionId = directionId;
+    }
+
+    public String getDirectionId() {
+        return this.directionId;
+    }
+
+    @Override
+    public void execute(GameLogic logic) {
+        if (logic.getPlayer() == null) {
+            logic.printToUser("go.player.null");
+        } else {
+            Entity location = logic.getPlayer().getLocation();
+            if (location == null) {
+                logic.printToUser("go.player.location.null", logic.getPlayer());
+            } else {
+                Entity.EntityConnection connection = location.getConnection(this.directionId);
+                if (connection == null || connection.to() == null) {
+                    logic.printToUser("go.direction.unknown", logic.getPlayer().getLocation(), this.directionId);
+                } else if (connection.associatedEntity() != null && connection.associatedEntity().isClosed()) {
+                    logic.printToUser("go.location.closed", connection.associatedEntity());
+                } else {
+                    try {
+                        logic.getPlayer().setLocation(connection.to());
+                        logic.printToUser("go.success", location, connection.to());
+                    } catch (CircularLocationException ex) {
+                        logic.printToUser("go.locationCircular", ex);
+                    }
+                }
+            }
+        }
+    }
+}

src/main/java/game/logic/actionsystem/actions/Open.java

@@ -0,0 +1,32 @@
+package game.logic.actionsystem.actions;
+
+import java.util.List;
+
+import game.logic.EntityDescription;
+import game.logic.GameLogic;
+import game.logic.actionsystem.Action;
+import game.state.Entity;
+import game.state.EntitySet;
+
+public class Open extends Action {
+    private final List<EntityDescription> descriptions;
+
+    public Open(List<EntityDescription> descriptions) {
+        this.descriptions = descriptions;
+    }
+
+    @Override
+    public void execute(GameLogic logic) {
+        for (EntitySet set : this.descriptions.stream().map(logic::searchForNearbyEntity).toList()) {
+            Entity e = set.collapse(logic);
+            if(e == null) {
+                logic.printToUser("open.noEntity");
+            } else if (logic.canPlayerOpen(e)) {
+                e.setClosed(false);
+                logic.printToUser("open.success", e);
+            } else {
+                logic.printToUser("open.failed", e);
+            }
+        }
+    }
+}

src/main/java/game/logic/actionsystem/actions/TakeFrom.java

@@ -0,0 +1,50 @@
+package game.logic.actionsystem.actions;
+
+import java.util.List;
+
+import game.logic.EntityDescription;
+import game.logic.GameLogic;
+import game.logic.actionsystem.Action;
+import game.state.CircularLocationException;
+import game.state.Entity;
+import game.state.EntitySet;
+
+public class TakeFrom extends Action {
+    private final List<EntityDescription> what;
+    private final List<EntityDescription> fromWhere;
+
+    public TakeFrom(List<EntityDescription> what, List<EntityDescription> fromWhere) {
+        this.what = what;
+        this.fromWhere = fromWhere;
+    }
+
+    public List<EntityDescription> getWhat() {
+        return this.what;
+    }
+
+    public List<EntityDescription> getFromWhere() {
+        return this.fromWhere;
+    }
+
+    @Override
+    public void execute(GameLogic logic) {
+        // TODO incorporate fromWhere
+        for (EntityDescription ed : this.what) {
+            EntitySet es = logic.searchForNearbyEntity(ed);
+            if(es.isEmpty()) {
+                logic.printToUser("entity.notFound", ed);
+            }
+            Entity e = es.collapse(logic);
+            if (e != null && logic.canPlayerTake(e)) {
+                try {
+                    e.setLocation(logic.getPlayer());
+                    logic.printToUser("take.success", e);
+                } catch (CircularLocationException ex) {
+                    logic.printToUser("take.error", ex);
+                }
+            } else {
+                logic.printToUser("take.failed", e);
+            }
+        }
+    }
+}

src/main/java/game/state/CircularLocationException.java

@@ -0,0 +1,7 @@
+package game.state;
+
+public class CircularLocationException extends Exception {
+    public CircularLocationException(String message) {
+        super(message);
+    }
+}

src/main/java/game/state/Entity.java

@@ -0,0 +1,125 @@
+package game.state;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+
+public class Entity {
+    public record EntityConnection(Entity to, Entity associatedEntity) {
+
+    }
+
+    private final String id;
+    private final Set<String> attributes = new HashSet<>();
+    private Entity location;
+    private boolean closed = false;
+    private final EntitySet contents = new EntitySet();
+    private final Map<String, EntityConnection> connections = new HashMap<>();
+
+    public Entity(String id, String... attributes) {
+        this.id = id;
+        this.attributes.addAll(Arrays.asList(attributes));
+    }
+
+    public String getId() {
+        return this.id;
+    }
+
+    public Set<String> getAttributes() {
+        return Collections.unmodifiableSet(this.attributes);
+    }
+
+    public boolean addAttribute(String attribute) {
+        return this.attributes.add(attribute);
+    }
+
+    public boolean removeAttribute(String attribute) {
+        return this.attributes.remove(attribute);
+    }
+
+    public void toggleAttribute(String attribute) {
+        if (!this.attributes.remove(attribute)) {
+            this.attributes.add(attribute);
+        }
+    }
+
+    public void switchAttribute(String attr1, String attr2) {
+        if (this.attributes.remove(attr1)) {
+            this.attributes.add(attr2);
+        } else if (this.attributes.remove(attr2)) {
+            this.attributes.add(attr1);
+        }
+    }
+
+    public void setLocation(Entity location) throws CircularLocationException {
+        if (location == this) {
+            throw new CircularLocationException("setLocation.self");
+        } else if (this.contains(location, true)) {
+            throw new CircularLocationException("setLocation.circular");
+        } else if (this.location != location) {
+            if (this.location != null) {
+                this.location.contents.remove(this);
+            }
+            this.location = location;
+            if (this.location != null) {
+                this.location.contents.add(this);
+            }
+        }
+    }
+
+    public boolean isClosed() {
+        return this.closed;
+    }
+
+    public void setClosed(boolean closed) {
+        this.closed = closed;
+    }
+
+    public boolean contains(Entity other, boolean recursive) {
+        return this.contents.getAll().stream().anyMatch(e -> e == other || (recursive && e.contains(other, true)));
+    }
+
+    public Entity getLocation() {
+        return this.location;
+    }
+
+    public Set<Entity> getContents() {
+        return this.contents.getAll();
+    }
+
+    public void connectUnidirectional(String directionId, Entity to, Entity associatedEntity) {
+        this.connections.put(directionId, new EntityConnection(to, associatedEntity));
+    }
+
+    public void connectBidirectional(String dirIdFromThisToOther, Entity associatedEntity, String dirIdFromOtherToThis, Entity to) {
+        this.connections.put(dirIdFromThisToOther, new EntityConnection(to, associatedEntity));
+        to.connections.put(dirIdFromOtherToThis, new EntityConnection(this, associatedEntity));
+    }
+
+    public void removeSingleConnection(String directionId) {
+        this.connections.remove(directionId);
+    }
+
+    public void removeBidirectionalConnection(String dirIdFromThisToOther, String dirIdFromOtherToThis) {
+        EntityConnection c = this.connections.remove(dirIdFromThisToOther);
+        if (c != null) {
+            c.to.connections.remove(dirIdFromOtherToThis);
+        }
+    }
+
+    public EntityConnection getConnection(String directionId) {
+        return this.connections.get(directionId);
+    }
+
+    public Set<String> getConnections() {
+        return Collections.unmodifiableSet(this.connections.keySet());
+    }
+
+    @Override
+    public String toString() {
+        return this.id;
+    }
+}

src/main/java/game/state/EntitySet.java

@@ -0,0 +1,55 @@
+package game.state;
+
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Set;
+import java.util.function.Predicate;
+
+import game.logic.GameLogic;
+
+public class EntitySet {
+    private final Set<Entity> entities;
+
+    public EntitySet(Entity... entities) {
+        this(Arrays.asList(entities));
+    }
+
+    public EntitySet(Collection<Entity> entities) {
+        this.entities = new HashSet<>(entities);
+    }
+
+    public boolean isEmpty() {
+        return this.entities.isEmpty();
+    }
+
+    public Set<Entity> getAll() {
+        return Collections.unmodifiableSet(this.entities);
+    }
+
+    public boolean add(Entity entity) {
+        return this.entities.add(entity);
+    }
+
+    public boolean remove(Entity entity) {
+        return this.entities.remove(entity);
+    }
+
+    public boolean contains(Entity entity) {
+        return this.entities.contains(entity);
+    }
+
+    public Entity collapse(GameLogic logic) {
+        if(this.entities.size() <= 1) {
+            return this.entities.stream().findAny().orElse(null);
+        } else {
+            // TODO if more than 1 candidate, ask user to specify
+            return this.entities.stream().findAny().orElse(null);
+        }
+    }
+
+    public EntitySet getFiltered(Predicate<Entity> acceptFunction) {
+        return new EntitySet(this.entities.stream().filter(acceptFunction).toList());
+    }
+}

src/main/java/game/state/GameState.java

@@ -0,0 +1,25 @@
+package game.state;
+
+import java.util.LinkedList;
+import java.util.List;
+
+import game.logic.EntityDescription;
+
+public class GameState {
+    private final List<Entity> entities = new LinkedList<>();
+
+    public GameState() {
+
+    }
+
+    public Entity createEntity(String id, String... attributes) {
+        Entity e = new Entity(id, attributes);
+        this.entities.add(e);
+        return e;
+    }
+
+    public EntitySet searchForEntity(EntityDescription description) {
+        return new EntitySet(this.entities.stream().filter(e -> e.getId().equals(description.getMainWord())
+                && e.getAttributes().containsAll(description.getAttributes())).toList());
+    }
+}

src/main/java/startup/Environment.java

@@ -1,10 +1,11 @@
 package startup;
 
-import areas.Area;
-
 import java.util.List;
 
+import areas.Area;
+
 public class Environment {
+    public static final Environment instance = new Environment();
 
     private Area currentArea;
     private List<Area> gameAreas;

src/main/java/util/Commands.java

@@ -1,17 +1,20 @@
+package util;
+
 import areas.Area;
+import startup.Environment;
 
 public class Commands {
 
     public static void go(Area area) {
-        Main.environment.setArea(area);
+        Environment.instance.setArea(area);
         area.enterArea();
     }
 
     public static void info() {
         String infoText = TextColors.PURPLE.colorize("Du bist hier: " +
-                Main.environment.getCurrentArea().getNameWithArticle()) + "\n" +
+                Environment.instance.getCurrentArea().getNameWithArticle()) + "\n" +
                 "Du kannst folgende Bereiche von hier erreichen: " +
-                String.join(", ", Main.environment.getCurrentArea().getReachableAreas());
+                String.join(", ", Environment.instance.getCurrentArea().getReachableAreas());
 
         System.out.println(infoText);
     }

src/main/java/util/TextColors.java

@@ -1,5 +1,4 @@
-import org.w3c.dom.Text;
-
+package util;
 public enum TextColors {
 
     RESET("\u001B[0m"),