Merge remote-tracking branch 'upstream/main'

.vscode/c_cpp_properties.json

@@ -13,7 +13,21 @@
       "cStandard": "c17",
       "cppStandard": "c++17",
       "intelliSenseMode": "windows-msvc-x64"
+    },
+    {
+      "name": "Mac",
+      "includePath": [
+        "${workspaceFolder}/**",
+        "${workspaceFolder}/node_modules/node-addon-api",
+        "${default}"
+      ],
+      "defines": ["_DEBUG", "MACOS"],
+      "compilerPath": "/usr/bin/clang++",
+      "cStandard": "c17",
+      "cppStandard": "c++17",
+      "intelliSenseMode": "macos-clang-x64"
     }
   ],
   "version": 4
 }
+  

.vscode/launch.json

@@ -0,0 +1,12 @@
+{
+    
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "type": "node",
+            "request": "launch",
+            "name": "Launch Program",
+            "program": "${workspaceFolder}/index.js"
+        }
+    ]
+}

.vscode/settings.json

@@ -67,6 +67,18 @@
     "xstring": "cpp",
     "xtr1common": "cpp",
     "xtree": "cpp",
-    "xutility": "cpp"
-  }
+    "xutility": "cpp",
+    "__bit_reference": "cpp",
+    "__locale": "cpp",
+    "__split_buffer": "cpp",
+    "__threading_support": "cpp",
+    "__verbose_abort": "cpp",
+    "cstdarg": "cpp",
+    "cwctype": "cpp",
+    "execution": "cpp",
+    "string_view": "cpp",
+    "variant": "cpp",
+    "bitset": "cpp",
+    "print": "cpp"
+  },
 }

binding.gyp

@@ -16,6 +16,9 @@
                 ['OS=="mac"', {
                     "sources": [
                         "src/macos/PolicyWatcher.cc",
+                        "src/macos/StringPolicy.cc",
+                        "src/macos/NumberPolicy.cc",
+                        "src/macos/BooleanPolicy.cc"
                     ],
                     "defines": [
                         "MACOS",
@@ -38,7 +41,8 @@
                     "sources": [
                         "src/windows/PolicyWatcher.cc",
                         "src/windows/StringPolicy.cc",
-                        "src/windows/NumberPolicy.cc"
+                        "src/windows/NumberPolicy.cc",
+                        "src/windows/BooleanPolicy.cc"
                     ],
                     "defines": [
                         "WINDOWS"

index.d.ts

@@ -9,9 +9,10 @@ interface Watcher {
 
 type StringPolicy = { type: "string" };
 type NumberPolicy = { type: "number" };
+type BooleanPolicy = { type: "boolean" };
 
 export interface Policies {
-  [policyName: string]: StringPolicy | NumberPolicy;
+  [policyName: string]: StringPolicy | NumberPolicy | BooleanPolicy;
 }
 
 export type PolicyUpdate<T extends Policies> = {
@@ -19,9 +20,11 @@ export type PolicyUpdate<T extends Policies> = {
     | undefined
     | (T[K] extends StringPolicy
         ? string
+        : (T[K] extends BooleanPolicy
+        ? boolean
         : T[K] extends NumberPolicy
         ? number
-        : never);
+        : never));
 };
 
 export function createWatcher<T extends Policies>(

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "@vscodium/policy-watcher",
-  "version": "1.1.8",
+  "version": "1.3.0-2503241459",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "@vscodium/policy-watcher",
-      "version": "1.1.8",
+      "version": "1.3.0-2503241459",
       "license": "MIT",
       "dependencies": {
         "bindings": "^1.5.0",

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@vscodium/policy-watcher",
-  "version": "1.1.10-2503041159",
+  "version": "1.3.0-2503241459",
   "description": "",
   "main": "index.js",
   "repository": {

src/Policy.hh

@@ -10,11 +10,18 @@
 
 using namespace Napi;
 
+enum class PolicyRefreshResult {
+  Updated,
+  Unchanged,
+  Removed,
+  NotSet
+};
+
 class Policy
 {
 public:
   virtual ~Policy() {}
-  virtual bool refresh() = 0;
+  virtual PolicyRefreshResult refresh() = 0;
   virtual Value getValue(Env env) const = 0;
   const std::string name;
 

src/PolicyWatcher.hh

@@ -14,6 +14,11 @@
 #include <windows.h>
 #endif
 
+#ifdef MACOS
+#define Boolean CFBoolean
+#include <CoreServices/CoreServices.h>
+#endif
+
 using namespace Napi;
 
 class PolicyWatcher : public AsyncProgressQueueWorker<const Policy *>
@@ -24,6 +29,7 @@ public:
 
   void AddStringPolicy(const std::string name);
   void AddNumberPolicy(const std::string name);
+  void AddBooleanPolicy(const std::string name);
 
   void OnExecute(Napi::Env env);
   void Execute(const ExecutionProgress &progress);
@@ -38,6 +44,13 @@ protected:
 #ifdef WINDOWS
   HANDLE handles[4];
 #endif
+
+#ifdef MACOS
+  FSEventStreamRef stream;
+  dispatch_semaphore_t sem;
+  bool disposed;
+#endif
+
 };
 
 #endif

src/linux/PolicyWatcher.cc

@@ -20,6 +20,7 @@ PolicyWatcher::~PolicyWatcher()
 
 void PolicyWatcher::AddStringPolicy(const std::string name) {}
 void PolicyWatcher::AddNumberPolicy(const std::string name) {}
+void PolicyWatcher::AddBooleanPolicy(const std::string name) {}
 void PolicyWatcher::OnExecute(Napi::Env env) {}
 void PolicyWatcher::Execute(const ExecutionProgress &progress) {}
 void PolicyWatcher::OnProgress(const Policy *const *policies, size_t count) {}

src/macos/BooleanPolicy.cc

@@ -0,0 +1,36 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+#include "BooleanPolicy.hh"
+
+using namespace Napi;
+
+BooleanPolicy::BooleanPolicy(const std::string name, const std::string &productName)
+    : PreferencesPolicy(name, productName)
+{
+}
+
+Value BooleanPolicy::getJSValue(Env env, bool value) const
+{
+  return Napi::Boolean::New(env, value);
+}
+
+std::optional<bool> BooleanPolicy::read() const
+{
+  auto pref = CFPreferencesCopyAppValue(key, appID);
+
+  if (pref == NULL)
+    return std::nullopt;
+
+  if (CFGetTypeID(pref) != CFBooleanGetTypeID())
+  {
+    CFRelease(pref);
+    return std::nullopt;
+  }
+
+  bool value = (pref == kCFBooleanTrue);
+  CFRelease(pref);
+  return value;
+}

src/macos/BooleanPolicy.hh

@@ -0,0 +1,24 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+#ifndef MAC_BOOLEAN_POLICY_H
+#define MAC_BOOLEAN_POLICY_H
+
+#include <napi.h>
+#include "PreferencesPolicy.hh"
+
+using namespace Napi;
+
+class BooleanPolicy : public PreferencesPolicy<bool>
+{
+public:
+  BooleanPolicy(const std::string name, const std::string &productName);
+  std::optional<bool> read() const override;
+
+protected:
+  Value getJSValue(Env env, bool value) const override;
+};
+
+#endif

src/macos/NumberPolicy.cc

@@ -0,0 +1,42 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+#include "NumberPolicy.hh"
+
+using namespace Napi;
+
+NumberPolicy::NumberPolicy(const std::string name, const std::string &productName)
+    : PreferencesPolicy(name, productName)
+{
+}
+
+Value NumberPolicy::getJSValue(Env env, long long value) const
+{
+  return Number::New(env, static_cast<double>(value));
+}
+
+std::optional<long long> NumberPolicy::read() const
+{
+  auto pref = CFPreferencesCopyAppValue(key, appID);
+
+  if (pref == NULL)
+    return std::nullopt;
+
+  if (CFGetTypeID(pref) != CFNumberGetTypeID())
+  {
+    CFRelease(pref);
+    return std::nullopt;
+  }
+
+  long long value;
+  if (CFNumberGetValue((CFNumberRef)pref, kCFNumberLongLongType, &value))
+  {
+    CFRelease(pref);
+    return value;
+  }
+
+  CFRelease(pref);
+  return std::nullopt;
+}

src/macos/NumberPolicy.hh

@@ -0,0 +1,24 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+#ifndef MAC_NUMBER_POLICY_H
+#define MAC_NUMBER_POLICY_H
+
+#include <napi.h>
+#include "PreferencesPolicy.hh"
+
+using namespace Napi;
+
+class NumberPolicy : public PreferencesPolicy<long long>
+{
+public:
+  NumberPolicy(const std::string name, const std::string &productName);
+  std::optional<long long> read() const override;
+
+protected:
+  Value getJSValue(Env env, long long value) const override;
+};
+
+#endif

src/macos/PolicyWatcher.cc

@@ -4,23 +4,136 @@
  *--------------------------------------------------------------------------------------------*/
 
 #include "../PolicyWatcher.hh"
+#include "StringPolicy.hh"
+#include "NumberPolicy.hh"
+#include "BooleanPolicy.hh"
+#include <thread>
 
 using namespace Napi;
 
+static void fsevents_callback(ConstFSEventStreamRef streamRef,
+                            void *clientCallBackInfo,
+                            size_t numEvents,
+                            void *eventPaths,
+                            const FSEventStreamEventFlags eventFlags[],
+                            const FSEventStreamEventId eventIds[])
+{
+    dispatch_semaphore_t *sem = (dispatch_semaphore_t *)clientCallBackInfo;
+    dispatch_semaphore_signal(*sem);
+}
+
 PolicyWatcher::PolicyWatcher(std::string vendorName, std::string productName, const Function &okCallback)
     : AsyncProgressQueueWorker(okCallback),
       vendorName(vendorName),
-      productName(productName)
+      productName(productName),
+      stream(nullptr),
+      sem(nullptr),
+      disposed(false)
 {
 }
 
 PolicyWatcher::~PolicyWatcher()
 {
+    if (stream) {
+        FSEventStreamStop(stream);
+        FSEventStreamInvalidate(stream);
+        FSEventStreamRelease(stream);
+    }
+    if (sem) {
+        dispatch_release(sem);
+    }
 }
 
-void PolicyWatcher::AddStringPolicy(const std::string name) {}
-void PolicyWatcher::AddNumberPolicy(const std::string name) {}
-void PolicyWatcher::OnExecute(Napi::Env env) {}
-void PolicyWatcher::Execute(const ExecutionProgress &progress) {}
-void PolicyWatcher::OnProgress(const Policy *const *policies, size_t count) {}
-void PolicyWatcher::Dispose() {}
+void PolicyWatcher::AddStringPolicy(const std::string name)
+{
+  policies.push_back(std::make_unique<StringPolicy>(name, productName));
+}
+void PolicyWatcher::AddNumberPolicy(const std::string name)
+{
+    policies.push_back(std::make_unique<NumberPolicy>(name, productName));
+}
+
+void PolicyWatcher::AddBooleanPolicy(const std::string name)
+{
+    policies.push_back(std::make_unique<BooleanPolicy>(name, productName));
+}
+
+void PolicyWatcher::OnExecute(Napi::Env env)
+{
+  AsyncProgressQueueWorker::OnExecute(env);
+}
+
+void PolicyWatcher::Execute(const ExecutionProgress &progress)
+{
+    std::vector<const Policy *> updatedPolicies;
+    bool first = true;
+
+    // Watch for changes
+    CFStringRef path = CFSTR("/Library/Managed Preferences/");
+    sem = dispatch_semaphore_create(0);
+    FSEventStreamContext context = {0, &sem, NULL, NULL, NULL};
+    stream = FSEventStreamCreate(NULL,
+                               &fsevents_callback,
+                               &context,
+                               CFArrayCreate(NULL, (const void **)&path, 1, NULL),
+                               kFSEventStreamEventIdSinceNow,
+                               1.0,
+                               kCFStreamEventNone);
+
+    dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
+    FSEventStreamSetDispatchQueue(stream, queue);
+    FSEventStreamStart(stream);
+
+    while (!disposed)
+    {
+        updatedPolicies.clear();
+        bool update = false;
+        for (auto &policy : policies)
+        {            
+            switch(policy->refresh())
+            {
+                case PolicyRefreshResult::Updated:
+                    updatedPolicies.push_back(policy.get());
+                    update = true;
+                    break;
+                case PolicyRefreshResult::Unchanged:
+                    updatedPolicies.push_back(policy.get());
+                    break;
+                case PolicyRefreshResult::Removed:
+                    update = true;
+                    break;
+            }
+        }
+
+        if (first || update)
+            progress.Send(&updatedPolicies[0], updatedPolicies.size());
+
+        first = false;
+        dispatch_semaphore_wait(sem, DISPATCH_TIME_FOREVER);
+    }
+}
+
+void PolicyWatcher::OnProgress(const Policy *const *policies, size_t count) 
+{
+  HandleScope scope(Env());
+  auto result = Object::New(Env());
+
+  if (count == 0)
+  {
+    Callback().Call(Receiver().Value(), {result});
+    return;
+  }
+
+  for (size_t i = 0; i < count; i++)
+    result.Set(policies[i]->name, policies[i]->getValue(Env()));
+
+  Callback().Call(Receiver().Value(), {result});
+}
+
+void PolicyWatcher::Dispose() 
+{
+    disposed = true;
+    if (sem) {
+        dispatch_semaphore_signal(sem);
+    }
+}

src/macos/PreferencesPolicy.hh

@@ -0,0 +1,72 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+#ifndef PREFERENCES_POLICY_H
+#define PREFERENCES_POLICY_H
+
+#include <napi.h>
+#include <CoreFoundation/CoreFoundation.h>
+#include "../Policy.hh"
+
+using namespace Napi;
+
+template <typename T>
+class PreferencesPolicy : public Policy
+{
+public:
+    PreferencesPolicy(const std::string name, const std::string &productName)
+        : Policy(name),
+          appID(CFStringCreateWithCString(NULL, productName.c_str(), kCFStringEncodingUTF8)),
+          key(CFStringCreateWithCString(NULL, name.c_str(), kCFStringEncodingUTF8))
+    {
+    }
+
+    ~PreferencesPolicy()
+    {
+        CFRelease(appID);
+        CFRelease(key);
+    }
+
+    PolicyRefreshResult refresh()
+    {
+        auto newValue = read();
+
+        // Check for no value or removal
+        if (!newValue.has_value())
+        {
+            if (!value.has_value())
+                return PolicyRefreshResult::NotSet;
+
+            value.reset();
+            return PolicyRefreshResult::Removed;
+        }
+
+        // Is the value updated?
+        if (value != newValue)
+        {
+            value = newValue;
+            return PolicyRefreshResult::Updated;
+        }
+
+        return PolicyRefreshResult::Unchanged;
+    }
+
+    Value getValue(Env env) const
+    {
+        if (!value.has_value())
+            return env.Undefined();
+        return getJSValue(env, *value); // value.value() is only supported after macOS 10.13
+    }
+
+protected:
+    std::optional<T> value;
+    const CFStringRef appID;
+    const CFStringRef key;
+    virtual Value getJSValue(Env env, T value) const = 0;
+    virtual std::optional<T> read() const = 0;
+
+private:
+};
+#endif

src/macos/StringPolicy.cc

@@ -0,0 +1,46 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+#include "StringPolicy.hh"
+
+using namespace Napi;
+
+StringPolicy::StringPolicy(const std::string name, const std::string &productName)
+    : PreferencesPolicy(name, productName)
+{
+}
+
+Value StringPolicy::getJSValue(Env env, std::string value) const
+{
+  return String::New(env, value);
+}
+
+std::optional<std::string> StringPolicy::read() const
+{
+  auto pref = CFPreferencesCopyAppValue(key, appID);
+
+  if (pref == NULL)
+    return std::nullopt;
+
+  if (CFGetTypeID(pref) != CFStringGetTypeID())
+  {
+    CFRelease(pref);
+    return std::nullopt;
+  }
+
+  CFIndex length = CFStringGetLength((CFStringRef)pref);
+  CFIndex maxSize = CFStringGetMaximumSizeForEncoding(length, kCFStringEncodingUTF8) + 1;
+  std::vector<char> buffer(maxSize);
+
+  if (CFStringGetCString((CFStringRef)pref, buffer.data(), maxSize, kCFStringEncodingUTF8))
+  {
+    std::string result(buffer.data());
+    CFRelease(pref);
+    return result;
+  }
+
+  CFRelease(pref);
+  return std::nullopt;
+}

src/macos/StringPolicy.hh

@@ -0,0 +1,23 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+#ifndef STRING_POLICY_H
+#define STRING_POLICY_H
+
+#include <napi.h>
+#include "PreferencesPolicy.hh"
+
+using namespace Napi;
+
+class StringPolicy : public PreferencesPolicy<std::string>
+{
+public:
+    StringPolicy(const std::string name, const std::string &productName);
+protected:
+    Value getJSValue(Env env, std::string value) const override;
+    std::optional<std::string> read() const override;
+};
+
+#endif

src/main.cc

@@ -22,7 +22,7 @@ Value CreateWatcher(const CallbackInfo &info)
 {
   auto env = info.Env();
 
-#ifndef WINDOWS
+#if !defined(WINDOWS) && !defined(MACOS)
   throw TypeError::New(env, "Unsupported platform");
 #endif
 
@@ -57,18 +57,23 @@ Value CreateWatcher(const CallbackInfo &info)
 
     auto policyType = std::string(rawPolicyType.As<String>());
 
-    if (policyType == "string")
+    if (policyType == "string") {
       watcher->AddStringPolicy(rawPolicyName.As<String>());
-    else if (policyType == "number")
+    }
+    else if (policyType == "number") {
       watcher->AddNumberPolicy(rawPolicyName.As<String>());
-    else
+    } else if (policyType == "boolean") {
+      watcher->AddBooleanPolicy(rawPolicyName.As<String>());
+    } else {
       throw TypeError::New(env, "Unknown policy type '" + policyType + "'");
+    }
   }
 
   watcher->Queue();
 
   auto result = Object::New(env);
   result.Set(String::New(env, "dispose"), Function::New(env, DisposeWatcher, "disposeWatcher", watcher));
+
   return result;
 }
 

src/windows/BooleanPolicy.cc

@@ -0,0 +1,28 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+#include "BooleanPolicy.hh"
+#include <iostream>
+
+using namespace Napi;
+
+BooleanPolicy::BooleanPolicy(const std::string& name, const std::string& productName)
+  : RegistryPolicy(name, productName, {REG_DWORD}) {}
+
+bool BooleanPolicy::parseRegistryValue(LPBYTE buffer, DWORD bufferSize, DWORD type) const
+{
+  if (type != REG_DWORD || bufferSize != sizeof(DWORD))
+  {
+    return false;
+  }
+
+  DWORD value = *reinterpret_cast<DWORD*>(buffer);
+  return (value != 0);
+}
+
+Value BooleanPolicy::getJSValue(Env env, bool value) const
+{
+  return Boolean::New(env, value);
+}

src/windows/BooleanPolicy.hh

@@ -0,0 +1,25 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+#ifndef BOOLEAN_POLICY_H
+#define BOOLEAN_POLICY_H
+
+#include <napi.h>
+#include <windows.h>
+#include "RegistryPolicy.hh"
+
+using namespace Napi;
+
+class BooleanPolicy : public RegistryPolicy<bool>
+{
+public:
+  BooleanPolicy(const std::string& name, const std::string &productName);
+
+protected:
+  bool parseRegistryValue(LPBYTE buffer, DWORD bufferSize, DWORD type) const;
+  Value getJSValue(Env env, bool value) const;
+};
+
+#endif

src/windows/PolicyWatcher.cc

@@ -8,6 +8,7 @@
 #include "../PolicyWatcher.hh"
 #include "StringPolicy.hh"
 #include "NumberPolicy.hh"
+#include "BooleanPolicy.hh"
 
 using namespace Napi;
 
@@ -38,6 +39,11 @@ void PolicyWatcher::AddNumberPolicy(const std::string name)
   policies.push_back(std::make_unique<NumberPolicy>(name, vendorName, productName));
 }
 
+void PolicyWatcher::AddBooleanPolicy(const std::string name)
+{
+  policies.push_back(std::make_unique<BooleanPolicy>(name, productName));
+}
+
 void PolicyWatcher::OnExecute(Napi::Env env)
 {
   if ((handles[0] = CreateEvent(NULL, false, false, NULL)) == NULL)
@@ -64,15 +70,26 @@ void PolicyWatcher::Execute(const ExecutionProgress &progress)
   {
     std::vector<const Policy *> updatedPolicies;
 
+    bool update = false;
+    updatedPolicies.clear();
     for (auto &policy : policies)
     {
-      if (policy->refresh())
+      switch (policy->refresh())
       {
+      case PolicyRefreshResult::Updated:
         updatedPolicies.push_back(policy.get());
+        update = true;
+        break;
+      case PolicyRefreshResult::Unchanged:
+        updatedPolicies.push_back(policy.get());
+        break;
+      case PolicyRefreshResult::Removed:
+        update = true;
+        break;
       }
     }
 
-    if (first || updatedPolicies.size() > 0)
+    if (first || update)
       progress.Send(&updatedPolicies[0], updatedPolicies.size());
 
     first = false;

src/windows/RegistryPolicy.hh

@@ -24,7 +24,7 @@ public:
         registryKey("Software\\Policies\\" + vendorName + "\\" + productName),
         supportedTypes(types) {}
 
-  bool refresh()
+  PolicyRefreshResult refresh()
   {
     auto machine = read(HKEY_LOCAL_MACHINE);
 
@@ -33,21 +33,31 @@ public:
       if (value != machine)
       {
         value = machine;
-        return true;
+        return PolicyRefreshResult::Updated;
       }
 
-      return false;
+      return PolicyRefreshResult::Unchanged;
     }
 
     auto user = read(HKEY_CURRENT_USER);
 
+    // Check for no value or removal
+    if (!user.has_value())
+    {
+        if (!value.has_value())
+            return PolicyRefreshResult::NotSet;
+
+        value.reset();
+        return PolicyRefreshResult::Removed;
+    }
+
     if (value != user)
     {
       value = user;
-      return true;
+      return PolicyRefreshResult::Updated;
     }
 
-    return false;
+    return PolicyRefreshResult::Unchanged;
   }
 
   Value getValue(Env env) const