[struct_pb] add namespace and nested message generator (#843)

Author: helintongh

src/struct_pb/tools/proto_to_struct.cpp

@@ -49,6 +49,8 @@ class struct_code_generator : public google::protobuf::compiler::CodeGenerator {
 
     auto output = context->Open(filename);
 
+    std::string package_name = file->package();
+
     bool enable_optional = false;
     bool enable_inherit = false;
 
@@ -65,10 +67,21 @@ class struct_code_generator : public google::protobuf::compiler::CodeGenerator {
 
     std::vector<struct_tokenizer> proto_module_info;
     std::vector<struct_enum> proto_enum_info;
+
     for (int i = 0; i < file->message_type_count(); ++i) {
       // struct name
       const google::protobuf::Descriptor* descriptor = file->message_type(i);
 
+      for (int k = 0; k < descriptor->nested_type_count(); ++k) {
+        struct_tokenizer tokenizer_nested;
+        tokenizer_nested.clear();
+
+        const google::protobuf::Descriptor* nested_type =
+            descriptor->nested_type(k);
+        tokenizer_nested.tokenizer(nested_type);
+        proto_module_info.emplace_back(tokenizer_nested);
+      }
+
       struct_enum enum_token;
       enum_token.clear();
       enum_token.get_enum_fields(descriptor);
@@ -80,7 +93,7 @@ class struct_code_generator : public google::protobuf::compiler::CodeGenerator {
       proto_module_info.emplace_back(tokenizer);
     }
 
-    std::string struct_header = code_generate_header();
+    std::string struct_header = code_generate_header(package_name);
     write_to_output(zero_copy_output, (const void*)struct_header.c_str(),
                     struct_header.size());
 
@@ -122,6 +135,10 @@ class struct_code_generator : public google::protobuf::compiler::CodeGenerator {
       write_to_output(zero_copy_output, (const void*)struct_macro_str.c_str(),
                       struct_macro_str.size());
     }
+    std::string namespace_last_part = "";
+    namespace_last_part = code_generate_last_part();
+    write_to_output(zero_copy_output, (const void*)namespace_last_part.c_str(),
+                    namespace_last_part.size());
 
     delete zero_copy_output;
     return true;

src/struct_pb/tools/struct_code_generator.hpp

@@ -5,8 +5,12 @@
 
 char parameter_value[27] = "abcdefghijklmnopqrstuvwxyz";
 
-std::string code_generate_header() {
+std::string code_generate_header(const std::string &package_name) {
   std::string result = "#pragma once\n#include <ylt/struct_pb.hpp>\n\n";
+
+  result.append("namespace ");
+  result.append(package_name);
+  result.append(" {\n\n");
   return result;
 }
 
@@ -263,4 +267,6 @@ std::string code_generate_enum(const struct_enum &enum_inst) {
     result.append("};\n\n");
   }
   return result;
-}
+}
+
+std::string code_generate_last_part() { return "}"; }

src/struct_pb/tools/struct_token.hpp

@@ -43,6 +43,7 @@ class struct_tokenizer {
     for (int j = 0; j < descriptor->field_count(); ++j) {
       struct_token token = {};
       const google::protobuf::FieldDescriptor* field = descriptor->field(j);
+
       token.var_name = field->name();
       if (field->type() == google::protobuf::FieldDescriptor::TYPE_MESSAGE) {
         token.type_name = field->message_type()->name();