Optimize preprocessed src json file format

Author: nunoplopes

cpp2rust/converter/translation_rule.cpp

@@ -185,27 +185,17 @@ void LoadIrSrc(ExprRules &exprs, TypeRules &types,
   }
 
   for (auto &[entry_name, entry_val] : *root) {
-    auto *obj = entry_val.getAsObject();
-    if (!obj) {
-      continue;
-    }
-    auto str = obj->getString("to_string");
-    if (!str) {
-      continue;
-    }
     auto name = entry_name.str();
-    if (name.empty()) {
-      continue;
-    }
+    auto val = entry_val.getAsString();
     if (name[0] == 'f') {
       auto it = exprs.find(name);
       if (it != exprs.end()) {
-        it->second.src = str->str();
+        it->second.src = val->str();
       }
     } else if (name[0] == 't') {
       auto it = types.find(name);
       if (it != types.end()) {
-        it->second.src = str->str();
+        it->second.src = val->str();
       }
     }
   }

cpp2rust/cpp_rule_preprocessor.cpp

@@ -93,15 +93,13 @@ class Callback : public clang::ast_matchers::MatchFinder::MatchCallback {
       } else {
         type = var->getUnderlyingType();
       }
-      out_[var->getQualifiedNameAsString()] =
-          llvm::json::Object{{"to_string", Mapper::ToString(type)}};
+      out_.try_emplace(var->getQualifiedNameAsString(), Mapper::ToString(type));
       return;
     }
 
     if (auto func = R.Nodes.getNodeAs<clang::FunctionDecl>("func")) {
       auto add = [&](std::string &&src) {
-        out_[func->getQualifiedNameAsString()] =
-            llvm::json::Object{{"to_string", std::move(src)}};
+        out_.try_emplace(func->getQualifiedNameAsString(), std::move(src));
       };
 
       if (const auto *fcall = R.Nodes.getNodeAs<clang::CallExpr>("fcall")) {