Apply Namer to Python code gen (#7146)

* Refactor out a  class from Rust Codegen

* Convert GenerateRustModuleRootFile

* git-clang-format

* unused variable

* parenthesis

* update BUILD file

* buildifier

* Delete bfbs_gen_rust.h

* Delete bfbs_gen_rust.cpp

* Addressed some comments

* Namer::EnumVariant

* Remove do not submit; Add Namespace vector overload

* Unshadow variable

* removed redundant variables

* Apply Namer to Python

* Use more variables a bit

* Apply const a bunch

* More variables

* Fix ObjectTypes

* git clang format

* small thing

* Simplified code around nested flatbuffers

* Make more methods const.

* Python files are kKeep case

* Address DO NOT SUBMIT in SaveType

* ensure dir exists before saving files

* fix space

Co-authored-by: Casper Neo <cneo@google.com>

src/idl_gen_rust.cpp

@@ -34,6 +34,7 @@ Namer::Config RustDefaultConfig() {
            /*methods=*/Case::kSnake,
            /*functions=*/Case::kSnake,
            /*fields=*/Case::kKeep,
+           /*variables=*/Case::kUnknown,  // Unused.
            /*variants=*/Case::kKeep,
            /*enum_variant_seperator=*/"::",
            /*namespaces=*/Case::kSnake,

src/namer.h

@@ -13,7 +13,7 @@ enum class SkipFile {
   Extension = 2,
   SuffixAndExtension = 3,
 };
-SkipFile operator&(SkipFile a, SkipFile b) {
+inline SkipFile operator&(SkipFile a, SkipFile b) {
   return static_cast<SkipFile>(static_cast<int>(a) & static_cast<int>(b));
 }
 
@@ -40,6 +40,9 @@ class Namer {
     // Case style for flatbuffers-defined fields.
     // e.g. `struct Struct { int my_field; }`
     Case fields;
+    // Case style for flatbuffers-defined variables.
+    // e.g. `int my_variable = 2`
+    Case variables;
     // Case style for flatbuffers-defined variants.
     // e.g. `enum class Enum { MyVariant, }`
     Case variants;
@@ -117,6 +120,10 @@ class Namer {
     return Format(s, config_.fields);
   }
 
+  std::string Variable(const std::string &s) const {
+    return Format(s, config_.variables);
+  }
+
   std::string Variant(const std::string &s) const {
     return Format(s, config_.variants);
   }
@@ -142,6 +149,11 @@ class Namer {
     return result;
   }
 
+  std::string NamespacedType(const std::vector<std::string> &ns,
+                             const std::string &s) const {
+    return Namespace(ns) + config_.namespace_seperator + Type(s);
+  }
+
   // Returns `filename` with the right casing, suffix, and extension.
   std::string File(const std::string &filename,
                    SkipFile skips = SkipFile::None) const {