Lua Generator using IR. (#6940)

* initial hack to get new Lua generator into flatc

* Starting to output enum defs for Lua

* Continue to work on table generation for Lua

* Finished basic getter access for Lua

* Added ability to get object by index

* Finished struct builder

* aliased reflection to r

* finish table builder generation

* register requiring files

* better generated header info

* Tying up loose ends

* Updated reflection to handle struct padding

* Addd type sizes to reflection

* Fixed some vector indirect issues

* Lua tests passed

* Misc cleanup

* ci fixes 1

* ci fixes 2

* renaming

* up size of type sizes

* manually ran clang-format-11 -i src/idl_parser.cpp

* fixed some windows casting

* remove stupid auto import

* more static_casting

* remove std

* update other build environments

* remove scoped enums

* replaced std::to_string with NumToString

* more win fixes

* more win fixes

* replaced old lua with new

* removed auto import

* review responses

* more style fixes

* refactor bfbs_gen_len to use code +=

* added consts

* fix lambda capture for windows

* remove unused return type

src/flatc_main.cpp

@@ -14,6 +14,10 @@
  * limitations under the License.
  */
 
+#include <memory>
+
+#include "bfbs_gen_lua.h"
+#include "flatbuffers/base.h"
 #include "flatbuffers/flatc.h"
 #include "flatbuffers/util.h"
 
@@ -50,59 +54,69 @@ int main(int argc, const char *argv[]) {
   // Prevent Appveyor-CI hangs.
   flatbuffers::SetupDefaultCRTReportMode();
 
+  const std::string flatbuffers_version(flatbuffers::FLATBUFFERS_VERSION());
+
+  std::unique_ptr<flatbuffers::BfbsGenerator> bfbs_gen_lua =
+      flatbuffers::NewLuaBfbsGenerator(flatbuffers_version);
+
   g_program_name = argv[0];
 
   const flatbuffers::FlatCompiler::Generator generators[] = {
     { flatbuffers::GenerateBinary, "-b", "--binary", "binary", false, nullptr,
       flatbuffers::IDLOptions::kBinary,
       "Generate wire format binaries for any data definitions",
-      flatbuffers::BinaryMakeRule },
+      flatbuffers::BinaryMakeRule, nullptr },
     { flatbuffers::GenerateTextFile, "-t", "--json", "text", false, nullptr,
       flatbuffers::IDLOptions::kJson,
       "Generate text output for any data definitions",
-      flatbuffers::TextMakeRule },
+      flatbuffers::TextMakeRule, nullptr },
     { flatbuffers::GenerateCPP, "-c", "--cpp", "C++", true,
       flatbuffers::GenerateCppGRPC, flatbuffers::IDLOptions::kCpp,
-      "Generate C++ headers for tables/structs", flatbuffers::CPPMakeRule },
+      "Generate C++ headers for tables/structs", flatbuffers::CPPMakeRule,
+      nullptr },
     { flatbuffers::GenerateGo, "-g", "--go", "Go", true,
       flatbuffers::GenerateGoGRPC, flatbuffers::IDLOptions::kGo,
-      "Generate Go files for tables/structs", nullptr },
+      "Generate Go files for tables/structs", nullptr, nullptr },
     { flatbuffers::GenerateJava, "-j", "--java", "Java", true,
       flatbuffers::GenerateJavaGRPC, flatbuffers::IDLOptions::kJava,
-      "Generate Java classes for tables/structs", flatbuffers::JavaMakeRule },
+      "Generate Java classes for tables/structs", flatbuffers::JavaMakeRule,
+      nullptr },
     { flatbuffers::GenerateDart, "-d", "--dart", "Dart", true, nullptr,
       flatbuffers::IDLOptions::kDart,
-      "Generate Dart classes for tables/structs", flatbuffers::DartMakeRule },
+      "Generate Dart classes for tables/structs", flatbuffers::DartMakeRule,
+      nullptr },
     { flatbuffers::GenerateTS, "-T", "--ts", "TypeScript", true,
       flatbuffers::GenerateTSGRPC, flatbuffers::IDLOptions::kTs,
-      "Generate TypeScript code for tables/structs", flatbuffers::TSMakeRule },
+      "Generate TypeScript code for tables/structs", flatbuffers::TSMakeRule,
+      nullptr },
     { flatbuffers::GenerateCSharp, "-n", "--csharp", "C#", true, nullptr,
       flatbuffers::IDLOptions::kCSharp,
-      "Generate C# classes for tables/structs", flatbuffers::CSharpMakeRule },
+      "Generate C# classes for tables/structs", flatbuffers::CSharpMakeRule,
+      nullptr },
     { flatbuffers::GeneratePython, "-p", "--python", "Python", true,
       flatbuffers::GeneratePythonGRPC, flatbuffers::IDLOptions::kPython,
-      "Generate Python files for tables/structs", nullptr },
+      "Generate Python files for tables/structs", nullptr, nullptr },
     { flatbuffers::GenerateLobster, nullptr, "--lobster", "Lobster", true,
       nullptr, flatbuffers::IDLOptions::kLobster,
-      "Generate Lobster files for tables/structs", nullptr },
+      "Generate Lobster files for tables/structs", nullptr, nullptr },
     { flatbuffers::GenerateLua, "-l", "--lua", "Lua", true, nullptr,
       flatbuffers::IDLOptions::kLua, "Generate Lua files for tables/structs",
-      nullptr },
+      nullptr, bfbs_gen_lua.get() },
     { flatbuffers::GenerateRust, "-r", "--rust", "Rust", true, nullptr,
       flatbuffers::IDLOptions::kRust, "Generate Rust files for tables/structs",
-      flatbuffers::RustMakeRule },
+      flatbuffers::RustMakeRule, nullptr },
     { flatbuffers::GeneratePhp, nullptr, "--php", "PHP", true, nullptr,
       flatbuffers::IDLOptions::kPhp, "Generate PHP files for tables/structs",
-      nullptr },
+      nullptr, nullptr },
     { flatbuffers::GenerateKotlin, nullptr, "--kotlin", "Kotlin", true, nullptr,
       flatbuffers::IDLOptions::kKotlin,
-      "Generate Kotlin classes for tables/structs", nullptr },
+      "Generate Kotlin classes for tables/structs", nullptr, nullptr },
     { flatbuffers::GenerateJsonSchema, nullptr, "--jsonschema", "JsonSchema",
       true, nullptr, flatbuffers::IDLOptions::kJsonSchema,
-      "Generate Json schema", nullptr },
+      "Generate Json schema", nullptr, nullptr },
     { flatbuffers::GenerateSwift, nullptr, "--swift", "swift", true,
       flatbuffers::GenerateSwiftGRPC, flatbuffers::IDLOptions::kSwift,
-      "Generate Swift files for tables/structs", nullptr },
+      "Generate Swift files for tables/structs", nullptr, nullptr },
   };
 
   flatbuffers::FlatCompiler::InitParams params;