temporary commit 3

wcfg/src/main/java/net/woggioni/wson/wcfg/ListenerImpl.java

@@ -25,6 +25,8 @@ class ListenerImpl implements WCFGListener {
     @Getter
     private final Value result;
 
+    private final List<ValueHolder> holders = new ArrayList<>();
+
     private interface StackLevel {
         Value getValue();
     }
@@ -74,15 +76,22 @@ class ListenerImpl implements WCFGListener {
 
     private void add2Last(Value value) {
         StackLevel last = stack.get(stack.size() - 1);
-        ArrayStackLevel asl;
-        ObjectStackLevel osl;
-        ExpressionStackLevel esl;
-        if ((asl = dynamicCast(last, ArrayStackLevel.class)) != null) {
+        if (last instanceof ArrayStackLevel asl) {
             asl.value.add(value);
-        } else if ((osl = dynamicCast(last, ObjectStackLevel.class)) != null) {
-            osl.value.put(osl.currentKey, value);
+            if(value instanceof ValueHolder holder) {
+                Value arrayValue = asl.getValue();
+                int index = arrayValue.size() - 1;
+                holder.addDeleter(() -> arrayValue.set(index, holder.getDelegate()));
+            }
+        } else if (last instanceof ObjectStackLevel osl) {
+            String key = osl.currentKey;
             osl.currentKey = null;
-        } else if((esl = dynamicCast(last, ExpressionStackLevel.class)) != null) {
+            osl.value.put(key, value);
+            if(value instanceof ValueHolder holder) {
+                Value objectValue = osl.getValue();
+                holder.addDeleter(() -> objectValue.put(key, holder.getDelegate()));
+            }
+        } else if(last instanceof ExpressionStackLevel esl) {
             esl.elements.add((ObjectValue) value);
         }
     }
@@ -117,7 +126,12 @@ class ListenerImpl implements WCFGListener {
     @Override
     public void enterAssignment(WCFGParser.AssignmentContext ctx) {
         ObjectStackLevel osl = (ObjectStackLevel) stack.get(0);
-        osl.currentKey = ctx.IDENTIFIER().getText();
+        String key = ctx.IDENTIFIER().getText();
+        osl.currentKey = key;
+        ValueHolder holder = new ValueHolder();
+        holders.add(holder);
+        holder.addDeleter(() -> result.put(key, holder.getDelegate()));
+        result.put(key, holder);
     }
 
     @Override
@@ -223,4 +237,10 @@ class ListenerImpl implements WCFGListener {
     public void exitEveryRule(ParserRuleContext ctx) {
 
     }
+
+    public void replaceHolders() {
+        for(ValueHolder holder : holders) {
+            holder.replace();
+        }
+    }
 }

wcfg/src/main/java/net/woggioni/wson/wcfg/ValueHolder.java

@@ -1,12 +1,22 @@
 package net.woggioni.wson.wcfg;
 
+import lombok.Getter;
 import lombok.Setter;
 import net.woggioni.wson.xface.Value;
 
+import java.util.ArrayList;
+import java.util.List;
 import java.util.Map;
 
-public class ValueHolder implements Value {
+class ValueHolder implements Value {
+    private List<Runnable> deleters = new ArrayList<>();
+
+    public void addDeleter(Runnable runnable) {
+        deleters.add(runnable);
+    }
+
     @Setter
+    @Getter
     private Value delegate = Value.Null;
     @Override
     public Type type() {
@@ -107,4 +117,10 @@ public class ValueHolder implements Value {
     public boolean has(String key) {
         return delegate.has(key);
     }
+
+    public void replace() {
+        for(Runnable run : deleters) {
+            run.run();
+        }
+    }
 }

wcfg/src/test/java/net/woggioni/wson/wcfg/ParseTest.java

@@ -25,7 +25,8 @@ public class ParseTest {
     @ValueSource(strings = {
 //        "build.wcfg",
 //        "test.wcfg",
-        "recursive.wcfg",
+//        "recursive.wcfg",
+        "recursive2.wcfg",
     })
     public void test(String resource) {
         try(Reader reader = new InputStreamReader(getClass().getClassLoader().getResourceAsStream(resource))) {
@@ -37,6 +38,7 @@ public class ParseTest {
             ListenerImpl listener = new ListenerImpl(cfg);
             ParseTreeWalker walker = new ParseTreeWalker();
             walker.walk(listener, parser.wcfg());
+            listener.replaceHolders();
             Value result = listener.getResult();
             new JSONDumper(cfg).dump(result, System.out);
         }

wcfg/src/test/resources/recursive.wcfg

@@ -3,4 +3,6 @@ value1 := {
     "myself" : value1
 };
 
-value2 := [value1];
+value2 := [value1];
+
+value3 := [1, 2, value3, null, false];

wcfg/src/test/resources/recursive2.wcfg

@@ -0,0 +1 @@
+value := [1, 2, value, null, false];