text: /*
   * Copyright 2014 Google Inc. All rights reserved.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
   // independent from idl_parser, since this code is not needed for most clients
  
  #include <string>
  
  #include "flatbuffers/code_generators.h"
  #include "flatbuffers/flatbuffers.h"
  #include "flatbuffers/idl.h"
  #include "flatbuffers/util.h"
  
  #include <unordered_set>
  
  namespace flatbuffers {
  namespace lua {
  
    // Hardcode spaces per indentation.
    const CommentConfig def_comment = { nullptr, "--", nullptr };
    const char * Indent = "    ";
    const char * Comment = "-- ";
    const char * End = "end\n";
    const char * EndFunc = "end\n";
    const char * SelfData = "self.view";
    const char * SelfDataPos = "self.view.pos";
    const char * SelfDataBytes = "self.view.bytes";
  
    class LuaGenerator : public BaseGenerator {
    public:
      LuaGenerator(const Parser &parser, const std::string &path,
        const std::string &file_name)
        : BaseGenerator(parser, path, file_name, "" /* not used */,
          "" /* not used */) {
        static const char * const keywords[] = {
          "and",
          "break",
          "do",
          "else",
          "elseif",
          "end",
          "false",
          "for",
          "function",
          "goto",
          "if",
          "in",
          "local",
          "nil",
          "not",
          "or",
          "repeat",
          "return",
          "then",
          "true",
          "until",
          "while"
        };
        keywords_.insert(std::begin(keywords), std::end(keywords));
      }
  
      // Most field accessors need to retrieve and test the field offset first,
      // this is the prefix code for that.
      std::string OffsetPrefix(const FieldDef &field) {
        return std::string(Indent) +
          "local o = " + SelfData + ":Offset(" + NumToString(field.value.offset) + ")\n" +
          Indent + "if o ~= 0 then\n";
      }
  
      // Begin a class declaration.
      void BeginClass(const StructDef &struct_def, std::string *code_ptr) {
        std::string &code = *code_ptr;
        code += "local " + NormalizedName(struct_def) + " = {} -- the module\n";
        code += "local " + NormalizedMetaName(struct_def) + " = {} -- the class metatable\n";
        code += "\n";
      }
  
      // Begin enum code with a class declaration.
      void BeginEnum(const std::string &class_name, std::string *code_ptr) {
        std::string &code = *code_ptr;
        code += "local " + class_name + " = {\n";
      }
  
      std::string EscapeKeyword(const std::string &name) const {
        return keywords_.find(name) == keywords_.end() ? name : "_" + name;
      }
  
      std::string NormalizedName(const Definition &definition) const {
        return EscapeKeyword(definition.name);
      }
  
      std::string NormalizedName(const EnumVal &ev) const {
        return EscapeKeyword(ev.name);
      }
  
      std::string NormalizedMetaName(const Definition &definition) const {
        return EscapeKeyword(definition.name) + "_mt";
      }
  
      // A single enum member.
      void EnumMember(const EnumDef &enum_def, const EnumVal &ev, std::string *code_ptr) {
        std::string &code = *code_ptr;
        code += std::string(Indent) + NormalizedName(ev) + " = " +
                enum_def.ToString(ev) + ",\n";
      }
  
      // End enum code.
      void EndEnum(std::string *code_ptr) {
        std::string &code = *code_ptr;
        code += "}\n";
      }
  
      void GenerateNewObjectPrototype(const StructDef &struct_def,
        std::string *code_ptr) {
        std::string &code = *code_ptr;
  
        code += "function " + NormalizedName(struct_def) + ".New()\n";
        code += std::string(Indent) + "local o = {}\n";
        code += std::string(Indent) + "setmetatable(o, {__index = " + NormalizedMetaName(struct_def) + "})\n";
        code += std::string(Indent) + "return o\n";
        code += EndFunc;
      }
  
      // Initialize a new struct or table from existing data.
      void NewRootTypeFromBuffer(const StructDef &struct_def,
        std::string *code_ptr) {
        std::string &code = *code_ptr;
  
        code += "function " + NormalizedName(struct_def) + ".GetRootAs" + NormalizedName(struct_def) + "(buf, offset)\n";
        code += std::string(Indent) + "local n = flatbuffers.N.UOffsetT:Unpack(buf, offset)\n";
        code += std::string(Indent) + "local o = " + NormalizedName(struct_def) + ".New()\n";
        code += std::string(Indent) + "o:Init(buf, n + offset)\n";
        code += std::string(Indent) + "return o\n";
        code += EndFunc;
      }
  
      // Initialize an existing object with other data, to avoid an allocation.
      void InitializeExisting(const StructDef &struct_def,
        std::string *code_ptr) {
        std::string &code = *code_ptr;
  
        GenReceiver(struct_def, code_ptr);
        code += "Init(buf, pos)\n";
        code += std::string(Indent) + SelfData + " = flatbuffers.view.New(buf, pos)\n";
        code += EndFunc;
      }
  
      // Get the length of a vector.
      void GetVectorLen(const StructDef &struct_def, const FieldDef &field,
        std::string *code_ptr) {
        std::string &code = *code_ptr;
  
        GenReceiver(struct_def, code_ptr);
        code += MakeCamel(NormalizedName(field)) + "Length()\n";
        code += OffsetPrefix(field);
        code += std::string(Indent) + Indent + "return " + SelfData + ":VectorLen(o)\n";
        code += std::string(Indent) + End;
        code += std::string(Indent) + "return 0\n";
        code += EndFunc;
      }
  
      // Get the value of a struct's scalar.
      void GetScalarFieldOfStruct(const StructDef &struct_def,
        const FieldDef &field,
        std::string *code_ptr) {
        std::string &code = *code_ptr;
        std::string getter = GenGetter(field.value.type);
        GenReceiver(struct_def, code_ptr);
        code += MakeCamel(NormalizedName(field));
        code += "()\n";
        code += std::string(Indent) + "return " + getter;
        code += std::string(SelfDataPos) + " + " + NumToString(field.value.offset) + ")\n";
        code += EndFunc;
      }
  
      // Get the value of a table's scalar.
      void GetScalarFieldOfTable(const StructDef &struct_def,
        const FieldDef &field,
        std::string *code_ptr) {
        std::string &code = *code_ptr;
        std::string getter = GenGetter(field.value.type);
        GenReceiver(struct_def, code_ptr);
        code += MakeCamel(NormalizedName(field));
        code += "()\n";
        code += OffsetPrefix(field);
        getter += std::string("o + ") + SelfDataPos + ")";
        auto is_bool = field.value.type.base_type == BASE_TYPE_BOOL;
        if (is_bool) {
          getter = "(" + getter + " ~= 0)";
        }
        code += std::string(Indent) + Indent + "return " + getter + "\n";
        code += std::string(Indent) + End;
        std::string default_value;
        if (is_bool) {
          default_value = field.value.constant == "0" ? "false" : "true";
        }
        else {
          default_value = field.value.constant;
        }
        code += std::string(Indent) + "return " + default_value + "\n";
        code += EndFunc;
      }
  
      // Get a struct by initializing an existing struct.
      // Specific to Struct.
      void GetStructFieldOfStruct(const StructDef &struct_def,
        const FieldDef &field,
        std::string *code_ptr) {
        std::string &code = *code_ptr;
        GenReceiver(struct_def, code_ptr);
        code += MakeCamel(NormalizedName(field));
        code += "(obj)\n";
        code += std::string(Indent) + "obj:Init(" + SelfDataBytes + ", " + SelfDataPos + " + ";
        code += NumToString(field.value.offset) + ")\n";
        code += std::string(Indent) + "return obj\n";
        code += EndFunc;
      }
  
      // Get a struct by initializing an existing struct.
      // Specific to Table.
      void GetStructFieldOfTable(const StructDef &struct_def,
        const FieldDef &field,
        std::string *code_ptr) {
        std::string &code = *code_ptr;
        GenReceiver(struct_def, code_ptr);
        code += MakeCamel(NormalizedName(field));
        code += "()\n";
        code += OffsetPrefix(field);
        if (field.value.type.struct_def->fixed) {
          code += std::string(Indent) + Indent + "local x = o + " + SelfDataPos + "\n";
        }
        else {
          code += std::string(Indent) + Indent + "local x = " + SelfData + ":Indirect(o + " + SelfDataPos + ")\n";
        }
        code += std::string(Indent) + Indent + "local obj = require('" + TypeNameWithNamespace(field) + "').New()\n";
        code += std::string(Indent) + Indent + "obj:Init(" + SelfDataBytes + ", x)\n";
        code += std::string(Indent) + Indent + "return obj\n";
        code += std::string(Indent) + End;
        code += EndFunc;
      }
  
      // Get the value of a string.
      void GetStringField(const StructDef &struct_def, const FieldDef &field,
        std::string *code_ptr) {
        std::string &code = *code_ptr;
        GenReceiver(struct_def, code_ptr);
        code += MakeCamel(NormalizedName(field));
        code += "()\n";
        code += OffsetPrefix(field);
        code += std::string(Indent) + Indent + "return " + GenGetter(field.value.type);
        code += std::string("o + ") + SelfDataPos + ")\n";
        code += std::string(Indent) + End;
        code += EndFunc;
      }
  
      // Get the value of a union from an object.
      void GetUnionField(const StructDef &struct_def, const FieldDef &field,
        std::string *code_ptr) {
        std::string &code = *code_ptr;
        GenReceiver(struct_def, code_ptr);
        code += MakeCamel(NormalizedName(field)) + "()\n";
        code += OffsetPrefix(field);
  
        // TODO(rw): this works and is not the good way to it:
        //bool is_native_table = TypeName(field) == "*flatbuffers.Table";
        //if (is_native_table) {
        //  code += std::string(Indent) + Indent + "from flatbuffers.table import Table\n";
        //} else {
        //  code += std::string(Indent) + Indent +
        //  code += "from ." + TypeName(field) + " import " + TypeName(field) + "\n";
        //}
        code += std::string(Indent) + Indent + "local obj = flatbuffers.view.New(require('flatbuffers.binaryarray').New(0), 0)\n";
        code += std::string(Indent) + Indent + GenGetter(field.value.type) + "obj, o)\n";
        code += std::string(Indent) + Indent + "return obj\n";
        code += std::string(Indent) + End;
        code += EndFunc;
      }
  
      // Get the value of a vector's struct member.
      void GetMemberOfVectorOfStruct(const StructDef &struct_def,
        const FieldDef &field,
        std::string *code_ptr) {
        std::string &code = *code_ptr;
        auto vectortype = field.value.type.VectorType();
  
        GenReceiver(struct_def, code_ptr);
        code += MakeCamel(NormalizedName(field));
        code += "(j)\n";
        code += OffsetPrefix(field);
        code += std::string(Indent) + Indent + "local x = " + SelfData + ":Vector(o)\n";
        code += std::string(Indent) + Indent + "x = x + ((j-1) * ";
        code += NumToString(InlineSize(vectortype)) + ")\n";
        if (!(vectortype.struct_def->fixed)) {
          code += std::string(Indent) + Indent + "x = " + SelfData + ":Indirect(x)\n";
        }
        code += std::string(Indent) + Indent + "local obj = require('" + TypeNameWithNamespace(field) + "').New()\n";
        code += std::string(Indent) + Indent + "obj:Init(" + SelfDataBytes + ", x)\n";
        code += std::string(Indent) + Indent + "return obj\n";
        code += std::string(Indent) + End;
        code += EndFunc;
      }
  
      // Get the value of a vector's non-struct member. Uses a named return
      // argument to conveniently set the zero value for the result.
      void GetMemberOfVectorOfNonStruct(const StructDef &struct_def,
        const FieldDef &field,
        std::string *code_ptr) {
        std::string &code = *code_ptr;
        auto vectortype = field.value.type.VectorType();
  
        GenReceiver(struct_def, code_ptr);
        code += MakeCamel(NormalizedName(field));
        code += "(j)\n";
        code += OffsetPrefix(field);
        code += std::string(Indent) + Indent + "local a = " + SelfData + ":Vector(o)\n";
        code += std::string(Indent) + Indent;
        code += "return " + GenGetter(field.value.type);
        code += "a + ((j-1) * ";
        code += NumToString(InlineSize(vectortype)) + "))\n";
        code += std::string(Indent) + End;
        if (vectortype.base_type == BASE_TYPE_STRING) {
          code += std::string(Indent) + "return ''\n";
        }
        else {
          code += std::string(Indent) + "return 0\n";
        }
        code += EndFunc;
      }
  
      // Begin the creator function signature.
      void BeginBuilderArgs(const StructDef &struct_def,
        std::string *code_ptr) {
        std::string &code = *code_ptr;
  
        code += "function " + NormalizedName(struct_def) + ".Create" + NormalizedName(struct_def);
        code += "(builder";
      }
  
      // Recursively generate arguments for a constructor, to deal with nested
      // structs.
      void StructBuilderArgs(const StructDef &struct_def,
        const char *nameprefix, std::string *code_ptr) {
        for (auto it = struct_def.fields.vec.begin();
          it != struct_def.fields.vec.end(); ++it) {
          auto &field = **it;
          if (IsStruct(field.value.type)) {
            // Generate arguments for a struct inside a struct. To ensure names
            // don't clash, and to make it obvious these arguments are constructing
            // a nested struct, prefix the name with the field name.
            StructBuilderArgs(*field.value.type.struct_def,
              (nameprefix + (NormalizedName(field) + "_")).c_str(), code_ptr);
          }
          else {
            std::string &code = *code_ptr;
            code += std::string(", ") + nameprefix;
            code += MakeCamel(NormalizedName(field), false);
          }
        }
      }
  
      // End the creator function signature.
      void EndBuilderArgs(std::string *code_ptr) {
        std::string &code = *code_ptr;
        code += ")\n";
      }
  
      // Recursively generate struct construction statements and instert manual
      // padding.
      void StructBuilderBody(const StructDef &struct_def,
        const char *nameprefix, std::string *code_ptr) {
        std::string &code = *code_ptr;
        code += std::string(Indent) + "builder:Prep(" + NumToString(struct_def.minalign) + ", ";
        code += NumToString(struct_def.bytesize) + ")\n";
        for (auto it = struct_def.fields.vec.rbegin();
          it != struct_def.fields.vec.rend(); ++it) {
          auto &field = **it;
          if (field.padding)
            code += std::string(Indent) + "builder:Pad(" + NumToString(field.padding) + ")\n";
          if (IsStruct(field.value.type)) {
            StructBuilderBody(*field.value.type.struct_def,
              (nameprefix + (NormalizedName(field) + "_")).c_str(), code_ptr);
          }
          else {
            code += std::string(Indent) + "builder:Prepend" + GenMethod(field) + "(";
            code += nameprefix + MakeCamel(NormalizedName(field), false) + ")\n";
          }
        }
      }
  
      void EndBuilderBody(std::string *code_ptr) {
        std::string &code = *code_ptr;
        code += std::string(Indent) + "return builder:Offset()\n";
        code += EndFunc;
      }
  
      // Get the value of a table's starting offset.
      void GetStartOfTable(const StructDef &struct_def,
        std::string *code_ptr) {
        std::string &code = *code_ptr;
        code += "function " + NormalizedName(struct_def) + ".Start";
        code += "(builder) ";
        code += "builder:StartObject(";
        code += NumToString(struct_def.fields.vec.size());
        code += ") end\n";
      }
  
      // Set the value of a table's field.
      void BuildFieldOfTable(const StructDef &struct_def,
        const FieldDef &field, const size_t offset,
        std::string *code_ptr) {
        std::string &code = *code_ptr;
        code += "function " + NormalizedName(struct_def) + ".Add" + MakeCamel(NormalizedName(field));
        code += "(builder, ";
        code += MakeCamel(NormalizedName(field), false);
        code += ") ";
        code += "builder:Prepend";
        code += GenMethod(field) + "Slot(";
        code += NumToString(offset) + ", ";
        // todo: i don't need to cast in Lua, but am I missing something?
      //    if (!IsScalar(field.value.type.base_type) && (!struct_def.fixed)) {
      //      code += "flatbuffers.N.UOffsetTFlags.py_type";
      //      code += "(";
      //      code += MakeCamel(NormalizedName(field), false) + ")";
      //    } else {
        code += MakeCamel(NormalizedName(field), false);
        //    }
        code += ", " + field.value.constant;
        code += ") end\n";
      }
  
      // Set the value of one of the members of a table's vector.
      void BuildVectorOfTable(const StructDef &struct_def,
        const FieldDef &field, std::string *code_ptr) {
        std::string &code = *code_ptr;
        code += "function " + NormalizedName(struct_def) + ".Start";
        code += MakeCamel(NormalizedName(field));
        code += "Vector(builder, numElems) return builder:StartVector(";
        auto vector_type = field.value.type.VectorType();
        auto alignment = InlineAlignment(vector_type);
        auto elem_size = InlineSize(vector_type);
        code += NumToString(elem_size);
        code += ", numElems, " + NumToString(alignment);
        code += ") end\n";
      }
  
      // Get the offset of the end of a table.
      void GetEndOffsetOnTable(const StructDef &struct_def,
        std::string *code_ptr) {
        std::string &code = *code_ptr;
        code += "function " + NormalizedName(struct_def) + ".End";
        code += "(builder) ";
        code += "return builder:EndObject() end\n";
      }
  
      // Generate the receiver for function signatures.
      void GenReceiver(const StructDef &struct_def, std::string *code_ptr) {
        std::string &code = *code_ptr;
        code += "function " + NormalizedMetaName(struct_def) + ":";
      }
  
      // Generate a struct field, conditioned on its child type(s).
      void GenStructAccessor(const StructDef &struct_def,
        const FieldDef &field, std::string *code_ptr) {
        GenComment(field.doc_comment, code_ptr, &def_comment);
        if (IsScalar(field.value.type.base_type)) {
          if (struct_def.fixed) {
            GetScalarFieldOfStruct(struct_def, field, code_ptr);
          }
          else {
            GetScalarFieldOfTable(struct_def, field, code_ptr);
          }
        }
        else {
          switch (field.value.type.base_type) {
          case BASE_TYPE_STRUCT:
            if (struct_def.fixed) {
              GetStructFieldOfStruct(struct_def, field, code_ptr);
            }
            else {
              GetStructFieldOfTable(struct_def, field, code_ptr);
            }
            break;
          case BASE_TYPE_STRING: GetStringField(struct_def, field, code_ptr); break;
          case BASE_TYPE_VECTOR: {
            auto vectortype = field.value.type.VectorType();
            if (vectortype.base_type == BASE_TYPE_STRUCT) {
              GetMemberOfVectorOfStruct(struct_def, field, code_ptr);
            }
            else {
              GetMemberOfVectorOfNonStruct(struct_def, field, code_ptr);
            }
            break;
          }
          case BASE_TYPE_UNION: GetUnionField(struct_def, field, code_ptr); break;
          default: FLATBUFFERS_ASSERT(0);
          }
        }
        if (field.value.type.base_type == BASE_TYPE_VECTOR) {
          GetVectorLen(struct_def, field, code_ptr);
        }
      }
  
      // Generate table constructors, conditioned on its members' types.
      void GenTableBuilders(const StructDef &struct_def,
        std::string *code_ptr) {
        GetStartOfTable(struct_def, code_ptr);
  
        for (auto it = struct_def.fields.vec.begin();
          it != struct_def.fields.vec.end(); ++it) {
          auto &field = **it;
          if (field.deprecated) continue;
  
          auto offset = it - struct_def.fields.vec.begin();
          BuildFieldOfTable(struct_def, field, offset, code_ptr);
          if (field.value.type.base_type == BASE_TYPE_VECTOR) {
            BuildVectorOfTable(struct_def, field, code_ptr);
          }
        }
  
        GetEndOffsetOnTable(struct_def, code_ptr);
      }
  
      // Generate struct or table methods.
      void GenStruct(const StructDef &struct_def, std::string *code_ptr) {
        if (struct_def.generated) return;
  
        GenComment(struct_def.doc_comment, code_ptr, &def_comment);
        BeginClass(struct_def, code_ptr);
  
        GenerateNewObjectPrototype(struct_def, code_ptr);
  
        if (!struct_def.fixed) {
          // Generate a special accessor for the table that has been declared as
          // the root type.
          NewRootTypeFromBuffer(struct_def, code_ptr);
        }
  
        // Generate the Init method that sets the field in a pre-existing
        // accessor object. This is to allow object reuse.
        InitializeExisting(struct_def, code_ptr);
        for (auto it = struct_def.fields.vec.begin();
          it != struct_def.fields.vec.end(); ++it) {
          auto &field = **it;
          if (field.deprecated) continue;
  
          GenStructAccessor(struct_def, field, code_ptr);
        }
  
        if (struct_def.fixed) {
          // create a struct constructor function
          GenStructBuilder(struct_def, code_ptr);
        }
        else {
          // Create a set of functions that allow table construction.
          GenTableBuilders(struct_def, code_ptr);
        }
      }
  
      // Generate enum declarations.
      void GenEnum(const EnumDef &enum_def, std::string *code_ptr) {
        if (enum_def.generated) return;
  
        GenComment(enum_def.doc_comment, code_ptr, &def_comment);
        BeginEnum(NormalizedName(enum_def), code_ptr);
        for (auto it = enum_def.Vals().begin(); it != enum_def.Vals().end();
             ++it) {
          auto &ev = **it;
          GenComment(ev.doc_comment, code_ptr, &def_comment, Indent);
          EnumMember(enum_def, ev, code_ptr);
        }
        EndEnum(code_ptr);
      }
  
      // Returns the function name that is able to read a value of the given type.
      std::string GenGetter(const Type &type) {
        switch (type.base_type) {
        case BASE_TYPE_STRING: return std::string(SelfData) + ":String(";
        case BASE_TYPE_UNION: return  std::string(SelfData) + ":Union(";
        case BASE_TYPE_VECTOR: return GenGetter(type.VectorType());
        default:
          return std::string(SelfData) + ":Get(flatbuffers.N." +
            MakeCamel(GenTypeGet(type)) + ", ";
        }
      }
  
      // Returns the method name for use with add/put calls.
      std::string GenMethod(const FieldDef &field) {
        return IsScalar(field.value.type.base_type)
          ? MakeCamel(GenTypeBasic(field.value.type))
          : (IsStruct(field.value.type) ? "Struct" : "UOffsetTRelative");
      }
  
      std::string GenTypeBasic(const Type &type) {
        static const char *ctypename[] = {
          // clang-format off
            #define FLATBUFFERS_TD(ENUM, IDLTYPE, \
              CTYPE, JTYPE, GTYPE, NTYPE, PTYPE, RTYPE) \
              #PTYPE,
              FLATBUFFERS_GEN_TYPES(FLATBUFFERS_TD)
            #undef FLATBUFFERS_TD
              // clang-format on
        };
        return ctypename[type.base_type];
      }
  
      std::string GenTypePointer(const Type &type) {
        switch (type.base_type) {
        case BASE_TYPE_STRING: return "string";
        case BASE_TYPE_VECTOR: return GenTypeGet(type.VectorType());
        case BASE_TYPE_STRUCT: return type.struct_def->name;
        case BASE_TYPE_UNION:
          // fall through
        default: return "*flatbuffers.Table";
        }
      }
  
      std::string GenTypeGet(const Type &type) {
        return IsScalar(type.base_type) ? GenTypeBasic(type) : GenTypePointer(type);
      }
  
      std::string GetNamespace(const Type &type) {
        return type.struct_def->defined_namespace->GetFullyQualifiedName(type.struct_def->name);
      }
  
      std::string TypeName(const FieldDef &field) {
        return GenTypeGet(field.value.type);
      }
  
      std::string TypeNameWithNamespace(const FieldDef &field) {
        return GetNamespace(field.value.type);
      }
  
      // Create a struct with a builder and the struct's arguments.
      void GenStructBuilder(const StructDef &struct_def,
        std::string *code_ptr) {
        BeginBuilderArgs(struct_def, code_ptr);
        StructBuilderArgs(struct_def, "", code_ptr);
        EndBuilderArgs(code_ptr);
  
        StructBuilderBody(struct_def, "", code_ptr);
        EndBuilderBody(code_ptr);
      }
  
      bool generate() {
        if (!generateEnums()) return false;
        if (!generateStructs()) return false;
        return true;
      }
  
    private:
      bool generateEnums() {
        for (auto it = parser_.enums_.vec.begin(); it != parser_.enums_.vec.end();
          ++it) {
          auto &enum_def = **it;
          std::string enumcode;
          GenEnum(enum_def, &enumcode);
          if (!SaveType(enum_def, enumcode, false)) return false;
        }
        return true;
      }
  
      bool generateStructs() {
        for (auto it = parser_.structs_.vec.begin();
          it != parser_.structs_.vec.end(); ++it) {
          auto &struct_def = **it;
          std::string declcode;
          GenStruct(struct_def, &declcode);
          if (!SaveType(struct_def, declcode, true)) return false;
        }
        return true;
      }
  
      // Begin by declaring namespace and imports.
      void BeginFile(const std::string &name_space_name, const bool needs_imports,
        std::string *code_ptr) {
        std::string &code = *code_ptr;
        code += std::string(Comment) + FlatBuffersGeneratedWarning() + "\n\n";
        code += std::string(Comment) + "namespace: " + name_space_name + "\n\n";
        if (needs_imports) {
          code += "local flatbuffers = require('flatbuffers')\n\n";
        }
      }
  
      // Save out the generated code for a Lua Table type.
      bool SaveType(const Definition &def, const std::string &classcode,
        bool needs_imports) {
        if (!classcode.length()) return true;
  
        std::string namespace_dir = path_;
        auto &namespaces = def.defined_namespace->components;
        for (auto it = namespaces.begin(); it != namespaces.end(); ++it) {
          if (it != namespaces.begin()) namespace_dir += kPathSeparator;
          namespace_dir += *it;
          //std::string init_py_filename = namespace_dir + "/__init__.py";
          //SaveFile(init_py_filename.c_str(), "", false);
        }
  
        std::string code = "";
        BeginFile(LastNamespacePart(*def.defined_namespace), needs_imports, &code);
        code += classcode;
        code += "\n";
        code += "return " + NormalizedName(def) + " " + Comment + "return the module";
        std::string filename =
          NamespaceDir(*def.defined_namespace) + NormalizedName(def) + ".lua";
        return SaveFile(filename.c_str(), code, false);
      }
    private:
      std::unordered_set<std::string> keywords_;
    };
  
  }  // namespace lua
  
  bool GenerateLua(const Parser &parser, const std::string &path,
    const std::string &file_name) {
    lua::LuaGenerator generator(parser, path, file_name);
    return generator.generate();
  }
  
  }  // namespace flatbuffers
  