src: prefer C++ empty() in boolean expressions

PR-URL: #34432
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Franziska Hinkelmann <franziska.hinkelmann@gmail.com>

src/inspector_agent.cc

@@ -445,7 +445,7 @@ bool IsFilePath(const std::string& path) {
 }
 #else
 bool IsFilePath(const std::string& path) {
-  return path.length() && path[0] == '/';
+  return !path.empty() && path[0] == '/';
 }
 #endif  // __POSIX__
 

src/inspector_js_api.cc

@@ -302,7 +302,7 @@ void WaitForDebugger(const FunctionCallbackInfo<Value>& args) {
 void Url(const FunctionCallbackInfo<Value>& args) {
   Environment* env = Environment::GetCurrent(args);
   std::string url = env->inspector_agent()->GetWsUrl();
-  if (url.length() == 0) {
+  if (url.empty()) {
     return;
   }
   args.GetReturnValue().Set(OneByteString(env->isolate(), url.c_str()));

src/node_file-inl.h

@@ -28,7 +28,7 @@ void FSContinuationData::MaybeSetFirstPath(const std::string& path) {
 }
 
 std::string FSContinuationData::PopPath() {
-  CHECK_GT(paths_.size(), 0);
+  CHECK(!paths_.empty());
   std::string path = std::move(paths_.back());
   paths_.pop_back();
   return path;

src/node_http2.cc

@@ -1510,7 +1510,7 @@ void Http2Session::ClearOutgoing(int status) {
 
   set_sending(false);
 
-  if (outgoing_buffers_.size() > 0) {
+  if (!outgoing_buffers_.empty()) {
     outgoing_storage_.clear();
     outgoing_length_ = 0;
 
@@ -1529,7 +1529,7 @@ void Http2Session::ClearOutgoing(int status) {
 
   // Now that we've finished sending queued data, if there are any pending
   // RstStreams we should try sending again and then flush them one by one.
-  if (pending_rst_streams_.size() > 0) {
+  if (!pending_rst_streams_.empty()) {
     std::vector<int32_t> current_pending_rst_streams;
     pending_rst_streams_.swap(current_pending_rst_streams);
 
@@ -1588,8 +1588,8 @@ uint8_t Http2Session::SendPendingData() {
   ssize_t src_length;
   const uint8_t* src;
 
-  CHECK_EQ(outgoing_buffers_.size(), 0);
-  CHECK_EQ(outgoing_storage_.size(), 0);
+  CHECK(outgoing_buffers_.empty());
+  CHECK(outgoing_storage_.empty());
 
   // Part One: Gather data from nghttp2
 

src/node_url.cc

@@ -1169,7 +1169,7 @@ bool ParseHost(const std::string& input,
                std::string* output,
                bool is_special,
                bool unicode = false) {
-  if (input.length() == 0) {
+  if (input.empty()) {
     output->clear();
     return true;
   }
@@ -2036,7 +2036,7 @@ void URL::Parse(const char* input,
               (ch == kEOL ||
                ch == '?' ||
                ch == '#')) {
-            while (url->path.size() > 1 && url->path[0].length() == 0) {
+            while (url->path.size() > 1 && url->path[0].empty()) {
               url->path.erase(url->path.begin());
             }
           }
@@ -2059,9 +2059,9 @@ void URL::Parse(const char* input,
             state = kFragment;
             break;
           default:
-            if (url->path.size() == 0)
+            if (url->path.empty())
               url->path.emplace_back("");
-            if (url->path.size() > 0 && ch != kEOL)
+            else if (ch != kEOL)
               AppendOrEscape(&url->path[0], ch, C0_CONTROL_ENCODE_SET);
         }
         break;

src/node_worker.cc

@@ -501,7 +501,7 @@ void Worker::New(const FunctionCallbackInfo<Value>& args) {
                             per_isolate_opts.get(),
                             kAllowedInEnvironment,
                             &errors);
-      if (errors.size() > 0 && args[1]->IsObject()) {
+      if (!errors.empty() && args[1]->IsObject()) {
         // Only fail for explicitly provided env, this protects from failures
         // when NODE_OPTIONS from parent's env is used (which is the default).
         Local<Value> error;