When a value in debugger represents plain JavaScript object, show its native fields in watch window

core/src/main/java/org/teavm/debugging/Value.java

@@ -57,4 +57,8 @@ public class Value {
         }
         return jsValue.getInstanceId();
     }
+
+    public JavaScriptValue getOriginalValue() {
+        return jsValue;
+    }
 }

tools/idea/plugin/src/main/java/org/teavm/idea/debug/TeaVMOriginalValue.java

@@ -0,0 +1,58 @@
+/*
+ *  Copyright 2018 Alexey Andreev.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package org.teavm.idea.debug;
+
+import com.intellij.util.PlatformIcons;
+import com.intellij.xdebugger.frame.XCompositeNode;
+import com.intellij.xdebugger.frame.XNamedValue;
+import com.intellij.xdebugger.frame.XValueChildrenList;
+import com.intellij.xdebugger.frame.XValueNode;
+import com.intellij.xdebugger.frame.XValuePlace;
+import javax.swing.Icon;
+import org.jetbrains.annotations.NotNull;
+import org.teavm.debugging.javascript.JavaScriptValue;
+import org.teavm.debugging.javascript.JavaScriptVariable;
+
+public class TeaVMOriginalValue extends XNamedValue {
+    private boolean root;
+    private JavaScriptValue innerValue;
+
+    public TeaVMOriginalValue(@NotNull String name, boolean root, JavaScriptValue innerValue) {
+        super(name);
+        this.root = root;
+        this.innerValue = innerValue;
+    }
+
+    @Override
+    public void computePresentation(@NotNull XValueNode node, @NotNull XValuePlace place) {
+        Icon icon = root ? PlatformIcons.VARIABLE_ICON : PlatformIcons.FIELD_ICON;
+        String representation = innerValue.getRepresentation();
+        if (representation == null) {
+            representation = "null";
+        }
+        node.setPresentation(icon, innerValue.getClassName(), representation, !innerValue.getProperties().isEmpty());
+    }
+
+
+    @Override
+    public void computeChildren(@NotNull XCompositeNode node) {
+        XValueChildrenList children = new XValueChildrenList();
+        for (JavaScriptVariable variable : innerValue.getProperties().values()) {
+            children.add(new TeaVMOriginalValue(variable.getName(), false, variable.getValue()));
+        }
+        node.addChildren(children, true);
+    }
+}

tools/idea/plugin/src/main/java/org/teavm/idea/debug/TeaVMStackFrame.java

@@ -20,11 +20,13 @@ import com.intellij.openapi.vfs.VirtualFileManager;
 import com.intellij.xdebugger.XDebuggerUtil;
 import com.intellij.xdebugger.XSourcePosition;
 import com.intellij.xdebugger.frame.XCompositeNode;
+import com.intellij.xdebugger.frame.XNamedValue;
 import com.intellij.xdebugger.frame.XStackFrame;
 import com.intellij.xdebugger.frame.XValueChildrenList;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.teavm.debugging.CallFrame;
+import org.teavm.debugging.Value;
 import org.teavm.debugging.Variable;
 import org.teavm.debugging.information.SourceLocation;
 import org.teavm.debugging.javascript.JavaScriptCallFrame;
@@ -74,8 +76,14 @@ class TeaVMStackFrame extends XStackFrame {
     public void computeChildren(@NotNull XCompositeNode node) {
         XValueChildrenList children = new XValueChildrenList();
         for (Variable variable : innerFrame.getVariables().values()) {
-            children.add(new TeaVMValue(variable.getName(), true, variable.getValue()));
+            children.add(createValueNode(variable.getName(), true, variable.getValue()));
         }
         node.addChildren(children, true);
     }
+
+    static XNamedValue createValueNode(String name, boolean root, Value value) {
+        return !value.getType().startsWith("@")
+                ? new TeaVMValue(name, root, value)
+                : new TeaVMOriginalValue(name, root, value.getOriginalValue());
+    }
 }

tools/idea/plugin/src/main/java/org/teavm/idea/debug/TeaVMValue.java

@@ -92,7 +92,7 @@ public class TeaVMValue extends XNamedValue {
     public void computeChildren(@NotNull XCompositeNode node) {
         XValueChildrenList children = new XValueChildrenList();
         for (Variable variable : innerValue.getProperties().values()) {
-            children.add(new TeaVMValue(variable.getName(), true, variable.getValue()));
+            children.add(TeaVMStackFrame.createValueNode(variable.getName(), false, variable.getValue()));
         }
         node.addChildren(children, true);
     }