diff --git a/include/flatbuffers/idl.h b/include/flatbuffers/idl.h
new file mode 100644
index 0000000..44e3566
--- /dev/null
+++ b/include/flatbuffers/idl.h
@@ -0,0 +1,1093 @@
+/*
+ * 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.
+ */
+
+#ifndef FLATBUFFERS_IDL_H_
+#define FLATBUFFERS_IDL_H_
+
+#include <map>
+#include <memory>
+#include <stack>
+
+#include "flatbuffers/base.h"
+#include "flatbuffers/flatbuffers.h"
+#include "flatbuffers/flexbuffers.h"
+#include "flatbuffers/hash.h"
+#include "flatbuffers/reflection.h"
+
+#if !defined(FLATBUFFERS_CPP98_STL)
+#  include <functional>
+#endif  // !defined(FLATBUFFERS_CPP98_STL)
+
+// This file defines the data types representing a parsed IDL (Interface
+// Definition Language) / schema file.
+
+// Limits maximum depth of nested objects.
+// Prevents stack overflow while parse flatbuffers or json.
+#if !defined(FLATBUFFERS_MAX_PARSING_DEPTH)
+#  define FLATBUFFERS_MAX_PARSING_DEPTH 64
+#endif
+
+namespace flatbuffers {
+
+// The order of these matters for Is*() functions below.
+// Additionally, Parser::ParseType assumes bool..string is a contiguous range
+// of type tokens.
+// clang-format off
+#define FLATBUFFERS_GEN_TYPES_SCALAR(TD) \
+  TD(NONE,   "",       uint8_t,  byte,   byte,    byte,   uint8,   u8,   UByte) \
+  TD(UTYPE,  "",       uint8_t,  byte,   byte,    byte,   uint8,   u8,   UByte) /* begin scalar/int */ \
+  TD(BOOL,   "bool",   uint8_t,  boolean,bool,    bool,   bool,    bool, Boolean) \
+  TD(CHAR,   "byte",   int8_t,   byte,   int8,    sbyte,  int8,    i8,   Byte) \
+  TD(UCHAR,  "ubyte",  uint8_t,  byte,   byte,    byte,   uint8,   u8,   UByte) \
+  TD(SHORT,  "short",  int16_t,  short,  int16,   short,  int16,   i16,  Short) \
+  TD(USHORT, "ushort", uint16_t, short,  uint16,  ushort, uint16,  u16,  UShort) \
+  TD(INT,    "int",    int32_t,  int,    int32,   int,    int32,   i32,  Int) \
+  TD(UINT,   "uint",   uint32_t, int,    uint32,  uint,   uint32,  u32,  UInt) \
+  TD(LONG,   "long",   int64_t,  long,   int64,   long,   int64,   i64,  Long) \
+  TD(ULONG,  "ulong",  uint64_t, long,   uint64,  ulong,  uint64,  u64,  ULong) /* end int */ \
+  TD(FLOAT,  "float",  float,    float,  float32, float,  float32, f32,  Float) /* begin float */ \
+  TD(DOUBLE, "double", double,   double, float64, double, float64, f64,  Double) /* end float/scalar */
+#define FLATBUFFERS_GEN_TYPES_POINTER(TD) \
+  TD(STRING, "string", Offset<void>, int, int, StringOffset, int, unused, Int) \
+  TD(VECTOR, "",       Offset<void>, int, int, VectorOffset, int, unused, Int) \
+  TD(STRUCT, "",       Offset<void>, int, int, int,          int, unused, Int) \
+  TD(UNION,  "",       Offset<void>, int, int, int,          int, unused, Int)
+#define FLATBUFFERS_GEN_TYPE_ARRAY(TD) \
+  TD(ARRAY,  "",       int,          int, int, int,          int, unused, Int)
+// The fields are:
+// - enum
+// - FlatBuffers schema type.
+// - C++ type.
+// - Java type.
+// - Go type.
+// - C# / .Net type.
+// - Python type.
+// - Rust type.
+// - Kotlin type.
+
+// using these macros, we can now write code dealing with types just once, e.g.
+
+/*
+switch (type) {
+  #define FLATBUFFERS_TD(ENUM, IDLTYPE, CTYPE, JTYPE, GTYPE, NTYPE, PTYPE, \
+                         RTYPE, KTYPE) \
+    case BASE_TYPE_ ## ENUM: \
+      // do something specific to CTYPE here
+    FLATBUFFERS_GEN_TYPES(FLATBUFFERS_TD)
+  #undef FLATBUFFERS_TD
+}
+*/
+
+#define FLATBUFFERS_GEN_TYPES(TD) \
+        FLATBUFFERS_GEN_TYPES_SCALAR(TD) \
+        FLATBUFFERS_GEN_TYPES_POINTER(TD) \
+        FLATBUFFERS_GEN_TYPE_ARRAY(TD)
+
+// Create an enum for all the types above.
+#ifdef __GNUC__
+__extension__  // Stop GCC complaining about trailing comma with -Wpendantic.
+#endif
+enum BaseType {
+  #define FLATBUFFERS_TD(ENUM, IDLTYPE, CTYPE, JTYPE, GTYPE, NTYPE, PTYPE, \
+                         RTYPE, KTYPE) \
+      BASE_TYPE_ ## ENUM,
+    FLATBUFFERS_GEN_TYPES(FLATBUFFERS_TD)
+  #undef FLATBUFFERS_TD
+};
+
+#define FLATBUFFERS_TD(ENUM, IDLTYPE, CTYPE, JTYPE, GTYPE, NTYPE, PTYPE, \
+                       RTYPE, KTYPE) \
+    static_assert(sizeof(CTYPE) <= sizeof(largest_scalar_t), \
+                  "define largest_scalar_t as " #CTYPE);
+  FLATBUFFERS_GEN_TYPES(FLATBUFFERS_TD)
+#undef FLATBUFFERS_TD
+
+inline bool IsScalar (BaseType t) { return t >= BASE_TYPE_UTYPE &&
+                                           t <= BASE_TYPE_DOUBLE; }
+inline bool IsInteger(BaseType t) { return t >= BASE_TYPE_UTYPE &&
+                                           t <= BASE_TYPE_ULONG; }
+inline bool IsFloat  (BaseType t) { return t == BASE_TYPE_FLOAT ||
+                                           t == BASE_TYPE_DOUBLE; }
+inline bool IsLong   (BaseType t) { return t == BASE_TYPE_LONG ||
+                                           t == BASE_TYPE_ULONG; }
+inline bool IsBool   (BaseType t) { return t == BASE_TYPE_BOOL; }
+inline bool IsOneByte(BaseType t) { return t >= BASE_TYPE_UTYPE &&
+                                           t <= BASE_TYPE_UCHAR; }
+
+inline bool IsUnsigned(BaseType t) {
+  return (t == BASE_TYPE_UTYPE)  || (t == BASE_TYPE_UCHAR) ||
+         (t == BASE_TYPE_USHORT) || (t == BASE_TYPE_UINT)  ||
+         (t == BASE_TYPE_ULONG);
+}
+
+// clang-format on
+
+extern const char *const kTypeNames[];
+extern const char kTypeSizes[];
+
+inline size_t SizeOf(BaseType t) { return kTypeSizes[t]; }
+
+struct StructDef;
+struct EnumDef;
+class Parser;
+
+// Represents any type in the IDL, which is a combination of the BaseType
+// and additional information for vectors/structs_.
+struct Type {
+  explicit Type(BaseType _base_type = BASE_TYPE_NONE, StructDef *_sd = nullptr,
+                EnumDef *_ed = nullptr, uint16_t _fixed_length = 0)
+      : base_type(_base_type),
+        element(BASE_TYPE_NONE),
+        struct_def(_sd),
+        enum_def(_ed),
+        fixed_length(_fixed_length) {}
+
+  bool operator==(const Type &o) {
+    return base_type == o.base_type && element == o.element &&
+           struct_def == o.struct_def && enum_def == o.enum_def;
+  }
+
+  Type VectorType() const {
+    return Type(element, struct_def, enum_def, fixed_length);
+  }
+
+  Offset<reflection::Type> Serialize(FlatBufferBuilder *builder) const;
+
+  bool Deserialize(const Parser &parser, const reflection::Type *type);
+
+  BaseType base_type;
+  BaseType element;       // only set if t == BASE_TYPE_VECTOR
+  StructDef *struct_def;  // only set if t or element == BASE_TYPE_STRUCT
+  EnumDef *enum_def;      // set if t == BASE_TYPE_UNION / BASE_TYPE_UTYPE,
+                          // or for an integral type derived from an enum.
+  uint16_t fixed_length;  // only set if t == BASE_TYPE_ARRAY
+};
+
+// Represents a parsed scalar value, it's type, and field offset.
+struct Value {
+  Value()
+      : constant("0"),
+        offset(static_cast<voffset_t>(~(static_cast<voffset_t>(0U)))) {}
+  Type type;
+  std::string constant;
+  voffset_t offset;
+};
+
+// Helper class that retains the original order of a set of identifiers and
+// also provides quick lookup.
+template<typename T> class SymbolTable {
+ public:
+  ~SymbolTable() {
+    for (auto it = vec.begin(); it != vec.end(); ++it) { delete *it; }
+  }
+
+  bool Add(const std::string &name, T *e) {
+    vector_emplace_back(&vec, e);
+    auto it = dict.find(name);
+    if (it != dict.end()) return true;
+    dict[name] = e;
+    return false;
+  }
+
+  void Move(const std::string &oldname, const std::string &newname) {
+    auto it = dict.find(oldname);
+    if (it != dict.end()) {
+      auto obj = it->second;
+      dict.erase(it);
+      dict[newname] = obj;
+    } else {
+      FLATBUFFERS_ASSERT(false);
+    }
+  }
+
+  T *Lookup(const std::string &name) const {
+    auto it = dict.find(name);
+    return it == dict.end() ? nullptr : it->second;
+  }
+
+ public:
+  std::map<std::string, T *> dict;  // quick lookup
+  std::vector<T *> vec;             // Used to iterate in order of insertion
+};
+
+// A name space, as set in the schema.
+struct Namespace {
+  Namespace() : from_table(0) {}
+
+  // Given a (potentally unqualified) name, return the "fully qualified" name
+  // which has a full namespaced descriptor.
+  // With max_components you can request less than the number of components
+  // the current namespace has.
+  std::string GetFullyQualifiedName(const std::string &name,
+                                    size_t max_components = 1000) const;
+
+  std::vector<std::string> components;
+  size_t from_table;  // Part of the namespace corresponds to a message/table.
+};
+
+inline bool operator<(const Namespace &a, const Namespace &b) {
+  size_t min_size = std::min(a.components.size(), b.components.size());
+  for (size_t i = 0; i < min_size; ++i) {
+    if (a.components[i] != b.components[i])
+      return a.components[i] < b.components[i];
+  }
+  return a.components.size() < b.components.size();
+}
+
+// Base class for all definition types (fields, structs_, enums_).
+struct Definition {
+  Definition()
+      : generated(false),
+        defined_namespace(nullptr),
+        serialized_location(0),
+        index(-1),
+        refcount(1) {}
+
+  flatbuffers::Offset<
+      flatbuffers::Vector<flatbuffers::Offset<reflection::KeyValue>>>
+  SerializeAttributes(FlatBufferBuilder *builder, const Parser &parser) const;
+
+  bool DeserializeAttributes(Parser &parser,
+                             const Vector<Offset<reflection::KeyValue>> *attrs);
+
+  std::string name;
+  std::string file;
+  std::vector<std::string> doc_comment;
+  SymbolTable<Value> attributes;
+  bool generated;  // did we already output code for this definition?
+  Namespace *defined_namespace;  // Where it was defined.
+
+  // For use with Serialize()
+  uoffset_t serialized_location;
+  int index;  // Inside the vector it is stored.
+  int refcount;
+};
+
+struct FieldDef : public Definition {
+  FieldDef()
+      : deprecated(false),
+        required(false),
+        key(false),
+        shared(false),
+        native_inline(false),
+        flexbuffer(false),
+        nested_flatbuffer(NULL),
+        padding(0) {}
+
+  Offset<reflection::Field> Serialize(FlatBufferBuilder *builder, uint16_t id,
+                                      const Parser &parser) const;
+
+  bool Deserialize(Parser &parser, const reflection::Field *field);
+
+  Value value;
+  bool deprecated;  // Field is allowed to be present in old data, but can't be.
+                    // written in new data nor accessed in new code.
+  bool required;    // Field must always be present.
+  bool key;         // Field functions as a key for creating sorted vectors.
+  bool shared;  // Field will be using string pooling (i.e. CreateSharedString)
+                // as default serialization behavior if field is a string.
+  bool native_inline;  // Field will be defined inline (instead of as a pointer)
+                       // for native tables if field is a struct.
+  bool flexbuffer;     // This field contains FlexBuffer data.
+  StructDef *nested_flatbuffer;  // This field contains nested FlatBuffer data.
+  size_t padding;                // Bytes to always pad after this field.
+};
+
+struct StructDef : public Definition {
+  StructDef()
+      : fixed(false),
+        predecl(true),
+        sortbysize(true),
+        has_key(false),
+        minalign(1),
+        bytesize(0) {}
+
+  void PadLastField(size_t min_align) {
+    auto padding = PaddingBytes(bytesize, min_align);
+    bytesize += padding;
+    if (fields.vec.size()) fields.vec.back()->padding = padding;
+  }
+
+  Offset<reflection::Object> Serialize(FlatBufferBuilder *builder,
+                                       const Parser &parser) const;
+
+  bool Deserialize(Parser &parser, const reflection::Object *object);
+
+  SymbolTable<FieldDef> fields;
+
+  bool fixed;       // If it's struct, not a table.
+  bool predecl;     // If it's used before it was defined.
+  bool sortbysize;  // Whether fields come in the declaration or size order.
+  bool has_key;     // It has a key field.
+  size_t minalign;  // What the whole object needs to be aligned to.
+  size_t bytesize;  // Size if fixed.
+
+  flatbuffers::unique_ptr<std::string> original_location;
+};
+
+inline bool IsStruct(const Type &type) {
+  return type.base_type == BASE_TYPE_STRUCT && type.struct_def->fixed;
+}
+
+inline bool IsVector(const Type &type) {
+  return type.base_type == BASE_TYPE_VECTOR;
+}
+
+inline bool IsArray(const Type &type) {
+  return type.base_type == BASE_TYPE_ARRAY;
+}
+
+inline bool IsSeries(const Type &type) {
+  return IsVector(type) || IsArray(type);
+}
+
+inline bool IsEnum(const Type &type) {
+  return type.enum_def != nullptr && IsInteger(type.base_type);
+}
+
+inline size_t InlineSize(const Type &type) {
+  return IsStruct(type)
+             ? type.struct_def->bytesize
+             : (IsArray(type)
+                    ? InlineSize(type.VectorType()) * type.fixed_length
+                    : SizeOf(type.base_type));
+}
+
+inline size_t InlineAlignment(const Type &type) {
+  return IsStruct(type)
+             ? type.struct_def->minalign
+             : (SizeOf(IsArray(type) ? type.element : type.base_type));
+}
+
+struct EnumDef;
+struct EnumValBuilder;
+
+struct EnumVal {
+  Offset<reflection::EnumVal> Serialize(FlatBufferBuilder *builder, const Parser &parser) const;
+
+  bool Deserialize(const Parser &parser, const reflection::EnumVal *val);
+
+  uint64_t GetAsUInt64() const { return static_cast<uint64_t>(value); }
+  int64_t GetAsInt64() const { return value; }
+  bool IsZero() const { return 0 == value; }
+  bool IsNonZero() const { return !IsZero(); }
+
+  std::string name;
+  std::vector<std::string> doc_comment;
+  Type union_type;
+
+ private:
+  friend EnumDef;
+  friend EnumValBuilder;
+  friend bool operator==(const EnumVal &lhs, const EnumVal &rhs);
+
+  EnumVal(const std::string &_name, int64_t _val) : name(_name), value(_val) {}
+  EnumVal() : value(0) {}
+
+  int64_t value;
+};
+
+struct EnumDef : public Definition {
+  EnumDef() : is_union(false), uses_multiple_type_instances(false) {}
+
+  Offset<reflection::Enum> Serialize(FlatBufferBuilder *builder,
+                                     const Parser &parser) const;
+
+  bool Deserialize(Parser &parser, const reflection::Enum *values);
+
+  template<typename T> void ChangeEnumValue(EnumVal *ev, T new_val);
+  void SortByValue();
+  void RemoveDuplicates();
+
+  std::string AllFlags() const;
+  const EnumVal *MinValue() const;
+  const EnumVal *MaxValue() const;
+  // Returns the number of integer steps from v1 to v2.
+  uint64_t Distance(const EnumVal *v1, const EnumVal *v2) const;
+  // Returns the number of integer steps from Min to Max.
+  uint64_t Distance() const { return Distance(MinValue(), MaxValue()); }
+
+  EnumVal *ReverseLookup(int64_t enum_idx,
+                         bool skip_union_default = false) const;
+  EnumVal *FindByValue(const std::string &constant) const;
+
+  std::string ToString(const EnumVal &ev) const {
+    return IsUInt64() ? NumToString(ev.GetAsUInt64())
+                      : NumToString(ev.GetAsInt64());
+  }
+
+  size_t size() const { return vals.vec.size(); }
+
+  const std::vector<EnumVal *> &Vals() const {
+    FLATBUFFERS_ASSERT(false == vals.vec.empty());
+    return vals.vec;
+  }
+
+  const EnumVal *Lookup(const std::string &enum_name) const {
+    return vals.Lookup(enum_name);
+  }
+
+  bool is_union;
+  // Type is a union which uses type aliases where at least one type is
+  // available under two different names.
+  bool uses_multiple_type_instances;
+  Type underlying_type;
+
+ private:
+  bool IsUInt64() const {
+    return (BASE_TYPE_ULONG == underlying_type.base_type);
+  }
+
+  friend EnumValBuilder;
+  SymbolTable<EnumVal> vals;
+};
+
+inline bool operator==(const EnumVal &lhs, const EnumVal &rhs) {
+  return lhs.value == rhs.value;
+}
+inline bool operator!=(const EnumVal &lhs, const EnumVal &rhs) {
+  return !(lhs == rhs);
+}
+
+inline bool EqualByName(const Type &a, const Type &b) {
+  return a.base_type == b.base_type && a.element == b.element &&
+         (a.struct_def == b.struct_def ||
+          a.struct_def->name == b.struct_def->name) &&
+         (a.enum_def == b.enum_def || a.enum_def->name == b.enum_def->name);
+}
+
+struct RPCCall : public Definition {
+  Offset<reflection::RPCCall> Serialize(FlatBufferBuilder *builder, const Parser &parser) const;
+
+  bool Deserialize(Parser &parser, const reflection::RPCCall *call);
+
+  StructDef *request, *response;
+};
+
+struct ServiceDef : public Definition {
+  Offset<reflection::Service> Serialize(FlatBufferBuilder *builder, const Parser &parser) const;
+  bool Deserialize(Parser &parser, const reflection::Service *service);
+
+  SymbolTable<RPCCall> calls;
+};
+
+// Container of options that may apply to any of the source/text generators.
+struct IDLOptions {
+  bool strict_json;
+  bool skip_js_exports;
+  bool use_goog_js_export_format;
+  bool use_ES6_js_export_format;
+  bool output_default_scalars_in_json;
+  int indent_step;
+  bool output_enum_identifiers;
+  bool prefixed_enums;
+  bool scoped_enums;
+  bool include_dependence_headers;
+  bool mutable_buffer;
+  bool one_file;
+  bool proto_mode;
+  bool proto_oneof_union;
+  bool generate_all;
+  bool skip_unexpected_fields_in_json;
+  bool generate_name_strings;
+  bool generate_object_based_api;
+  bool gen_compare;
+  std::string cpp_object_api_pointer_type;
+  std::string cpp_object_api_string_type;
+  bool cpp_object_api_string_flexible_constructor;
+  bool gen_nullable;
+  bool gen_generated;
+  std::string object_prefix;
+  std::string object_suffix;
+  bool union_value_namespacing;
+  bool allow_non_utf8;
+  bool natural_utf8;
+  std::string include_prefix;
+  bool keep_include_path;
+  bool binary_schema_comments;
+  bool binary_schema_builtins;
+  bool skip_flatbuffers_import;
+  std::string go_import;
+  std::string go_namespace;
+  bool reexport_ts_modules;
+  bool js_ts_short_names;
+  bool protobuf_ascii_alike;
+  bool size_prefixed;
+  std::string root_type;
+  bool force_defaults;
+  std::vector<std::string> cpp_includes;
+
+  // Possible options for the more general generator below.
+  enum Language {
+    kJava = 1 << 0,
+    kCSharp = 1 << 1,
+    kGo = 1 << 2,
+    kCpp = 1 << 3,
+    kJs = 1 << 4,
+    kPython = 1 << 5,
+    kPhp = 1 << 6,
+    kJson = 1 << 7,
+    kBinary = 1 << 8,
+    kTs = 1 << 9,
+    kJsonSchema = 1 << 10,
+    kDart = 1 << 11,
+    kLua = 1 << 12,
+    kLobster = 1 << 13,
+    kRust = 1 << 14,
+    kKotlin = 1 << 15,
+    kMAX
+  };
+
+  Language lang;
+
+  enum MiniReflect { kNone, kTypes, kTypesAndNames };
+
+  MiniReflect mini_reflect;
+
+  // The corresponding language bit will be set if a language is included
+  // for code generation.
+  unsigned long lang_to_generate;
+
+  // If set (default behavior), empty string and vector fields will be set to
+  // nullptr to make the flatbuffer more compact.
+  bool set_empty_to_null;
+
+  IDLOptions()
+      : strict_json(false),
+        skip_js_exports(false),
+        use_goog_js_export_format(false),
+        use_ES6_js_export_format(false),
+        output_default_scalars_in_json(false),
+        indent_step(2),
+        output_enum_identifiers(true),
+        prefixed_enums(true),
+        scoped_enums(false),
+        include_dependence_headers(true),
+        mutable_buffer(false),
+        one_file(false),
+        proto_mode(false),
+        proto_oneof_union(false),
+        generate_all(false),
+        skip_unexpected_fields_in_json(false),
+        generate_name_strings(false),
+        generate_object_based_api(false),
+        gen_compare(false),
+        cpp_object_api_pointer_type("std::unique_ptr"),
+        cpp_object_api_string_flexible_constructor(false),
+        gen_nullable(false),
+        gen_generated(false),
+        object_suffix("T"),
+        union_value_namespacing(true),
+        allow_non_utf8(false),
+        natural_utf8(false),
+        keep_include_path(false),
+        binary_schema_comments(false),
+        binary_schema_builtins(false),
+        skip_flatbuffers_import(false),
+        reexport_ts_modules(true),
+        js_ts_short_names(false),
+        protobuf_ascii_alike(false),
+        size_prefixed(false),
+        force_defaults(false),
+        lang(IDLOptions::kJava),
+        mini_reflect(IDLOptions::kNone),
+        lang_to_generate(0),
+        set_empty_to_null(true) {}
+};
+
+// This encapsulates where the parser is in the current source file.
+struct ParserState {
+  ParserState()
+      : cursor_(nullptr),
+        line_start_(nullptr),
+        line_(0),
+        token_(-1),
+        attr_is_trivial_ascii_string_(true) {}
+
+ protected:
+  void ResetState(const char *source) {
+    cursor_ = source;
+    line_ = 0;
+    MarkNewLine();
+  }
+
+  void MarkNewLine() {
+    line_start_ = cursor_;
+    line_ += 1;
+  }
+
+  int64_t CursorPosition() const {
+    FLATBUFFERS_ASSERT(cursor_ && line_start_ && cursor_ >= line_start_);
+    return static_cast<int64_t>(cursor_ - line_start_);
+  }
+
+  const char *cursor_;
+  const char *line_start_;
+  int line_;  // the current line being parsed
+  int token_;
+
+  // Flag: text in attribute_ is true ASCII string without escape
+  // sequences. Only printable ASCII (without [\t\r\n]).
+  // Used for number-in-string (and base64 string in future).
+  bool attr_is_trivial_ascii_string_;
+  std::string attribute_;
+  std::vector<std::string> doc_comment_;
+};
+
+// A way to make error propagation less error prone by requiring values to be
+// checked.
+// Once you create a value of this type you must either:
+// - Call Check() on it.
+// - Copy or assign it to another value.
+// Failure to do so leads to an assert.
+// This guarantees that this as return value cannot be ignored.
+class CheckedError {
+ public:
+  explicit CheckedError(bool error)
+      : is_error_(error), has_been_checked_(false) {}
+
+  CheckedError &operator=(const CheckedError &other) {
+    is_error_ = other.is_error_;
+    has_been_checked_ = false;
+    other.has_been_checked_ = true;
+    return *this;
+  }
+
+  CheckedError(const CheckedError &other) {
+    *this = other;  // Use assignment operator.
+  }
+
+  ~CheckedError() { FLATBUFFERS_ASSERT(has_been_checked_); }
+
+  bool Check() {
+    has_been_checked_ = true;
+    return is_error_;
+  }
+
+ private:
+  bool is_error_;
+  mutable bool has_been_checked_;
+};
+
+// Additionally, in GCC we can get these errors statically, for additional
+// assurance:
+// clang-format off
+#ifdef __GNUC__
+#define FLATBUFFERS_CHECKED_ERROR CheckedError \
+          __attribute__((warn_unused_result))
+#else
+#define FLATBUFFERS_CHECKED_ERROR CheckedError
+#endif
+// clang-format on
+
+class Parser : public ParserState {
+ public:
+  explicit Parser(const IDLOptions &options = IDLOptions())
+      : current_namespace_(nullptr),
+        empty_namespace_(nullptr),
+        root_struct_def_(nullptr),
+        opts(options),
+        uses_flexbuffers_(false),
+        source_(nullptr),
+        anonymous_counter(0),
+        recurse_protection_counter(0) {
+    if (opts.force_defaults) {
+      builder_.ForceDefaults(true);
+    }
+    // Start out with the empty namespace being current.
+    empty_namespace_ = new Namespace();
+    namespaces_.push_back(empty_namespace_);
+    current_namespace_ = empty_namespace_;
+    known_attributes_["deprecated"] = true;
+    known_attributes_["required"] = true;
+    known_attributes_["key"] = true;
+    known_attributes_["shared"] = true;
+    known_attributes_["hash"] = true;
+    known_attributes_["id"] = true;
+    known_attributes_["force_align"] = true;
+    known_attributes_["bit_flags"] = true;
+    known_attributes_["original_order"] = true;
+    known_attributes_["nested_flatbuffer"] = true;
+    known_attributes_["csharp_partial"] = true;
+    known_attributes_["streaming"] = true;
+    known_attributes_["idempotent"] = true;
+    known_attributes_["cpp_type"] = true;
+    known_attributes_["cpp_ptr_type"] = true;
+    known_attributes_["cpp_ptr_type_get"] = true;
+    known_attributes_["cpp_str_type"] = true;
+    known_attributes_["cpp_str_flex_ctor"] = true;
+    known_attributes_["native_inline"] = true;
+    known_attributes_["native_custom_alloc"] = true;
+    known_attributes_["native_type"] = true;
+    known_attributes_["native_default"] = true;
+    known_attributes_["flexbuffer"] = true;
+    known_attributes_["private"] = true;
+  }
+
+  ~Parser() {
+    for (auto it = namespaces_.begin(); it != namespaces_.end(); ++it) {
+      delete *it;
+    }
+  }
+
+  // Parse the string containing either schema or JSON data, which will
+  // populate the SymbolTable's or the FlatBufferBuilder above.
+  // include_paths is used to resolve any include statements, and typically
+  // should at least include the project path (where you loaded source_ from).
+  // include_paths must be nullptr terminated if specified.
+  // If include_paths is nullptr, it will attempt to load from the current
+  // directory.
+  // If the source was loaded from a file and isn't an include file,
+  // supply its name in source_filename.
+  // All paths specified in this call must be in posix format, if you accept
+  // paths from user input, please call PosixPath on them first.
+  bool Parse(const char *_source, const char **include_paths = nullptr,
+             const char *source_filename = nullptr);
+
+  // Set the root type. May override the one set in the schema.
+  bool SetRootType(const char *name);
+
+  // Mark all definitions as already having code generated.
+  void MarkGenerated();
+
+  // Get the files recursively included by the given file. The returned
+  // container will have at least the given file.
+  std::set<std::string> GetIncludedFilesRecursive(
+      const std::string &file_name) const;
+
+  // Fills builder_ with a binary version of the schema parsed.
+  // See reflection/reflection.fbs
+  void Serialize();
+
+  // Deserialize a schema buffer
+  bool Deserialize(const uint8_t *buf, const size_t size);
+
+  // Fills internal structure as if the schema passed had been loaded by parsing
+  // with Parse except that included filenames will not be populated.
+  bool Deserialize(const reflection::Schema* schema);
+
+  Type* DeserializeType(const reflection::Type* type);
+
+  // Checks that the schema represented by this parser is a safe evolution
+  // of the schema provided. Returns non-empty error on any problems.
+  std::string ConformTo(const Parser &base);
+
+  // Similar to Parse(), but now only accepts JSON to be parsed into a
+  // FlexBuffer.
+  bool ParseFlexBuffer(const char *source, const char *source_filename,
+                       flexbuffers::Builder *builder);
+
+  StructDef *LookupStruct(const std::string &id) const;
+
+  std::string UnqualifiedName(const std::string &fullQualifiedName);
+
+  FLATBUFFERS_CHECKED_ERROR Error(const std::string &msg);
+
+ private:
+  void Message(const std::string &msg);
+  void Warning(const std::string &msg);
+  FLATBUFFERS_CHECKED_ERROR ParseHexNum(int nibbles, uint64_t *val);
+  FLATBUFFERS_CHECKED_ERROR Next();
+  FLATBUFFERS_CHECKED_ERROR SkipByteOrderMark();
+  bool Is(int t) const;
+  bool IsIdent(const char *id) const;
+  FLATBUFFERS_CHECKED_ERROR Expect(int t);
+  std::string TokenToStringId(int t) const;
+  EnumDef *LookupEnum(const std::string &id);
+  FLATBUFFERS_CHECKED_ERROR ParseNamespacing(std::string *id,
+                                             std::string *last);
+  FLATBUFFERS_CHECKED_ERROR ParseTypeIdent(Type &type);
+  FLATBUFFERS_CHECKED_ERROR ParseType(Type &type);
+  FLATBUFFERS_CHECKED_ERROR AddField(StructDef &struct_def,
+                                     const std::string &name, const Type &type,
+                                     FieldDef **dest);
+  FLATBUFFERS_CHECKED_ERROR ParseField(StructDef &struct_def);
+  FLATBUFFERS_CHECKED_ERROR ParseString(Value &val);
+  FLATBUFFERS_CHECKED_ERROR ParseComma();
+  FLATBUFFERS_CHECKED_ERROR ParseAnyValue(Value &val, FieldDef *field,
+                                          size_t parent_fieldn,
+                                          const StructDef *parent_struct_def,
+                                          uoffset_t count,
+                                          bool inside_vector = false);
+  template<typename F>
+  FLATBUFFERS_CHECKED_ERROR ParseTableDelimiters(size_t &fieldn,
+                                                 const StructDef *struct_def,
+                                                 F body);
+  FLATBUFFERS_CHECKED_ERROR ParseTable(const StructDef &struct_def,
+                                       std::string *value, uoffset_t *ovalue);
+  void SerializeStruct(const StructDef &struct_def, const Value &val);
+  void SerializeStruct(FlatBufferBuilder &builder, const StructDef &struct_def,
+                       const Value &val);
+  template<typename F>
+  FLATBUFFERS_CHECKED_ERROR ParseVectorDelimiters(uoffset_t &count, F body);
+  FLATBUFFERS_CHECKED_ERROR ParseVector(const Type &type, uoffset_t *ovalue,
+                                        FieldDef *field, size_t fieldn);
+  FLATBUFFERS_CHECKED_ERROR ParseArray(Value &array);
+  FLATBUFFERS_CHECKED_ERROR ParseNestedFlatbuffer(Value &val, FieldDef *field,
+                                                  size_t fieldn,
+                                                  const StructDef *parent_struct_def);
+  FLATBUFFERS_CHECKED_ERROR ParseMetaData(SymbolTable<Value> *attributes);
+  FLATBUFFERS_CHECKED_ERROR TryTypedValue(const std::string *name, int dtoken, bool check, Value &e,
+                                          BaseType req, bool *destmatch);
+  FLATBUFFERS_CHECKED_ERROR ParseHash(Value &e, FieldDef* field);
+  FLATBUFFERS_CHECKED_ERROR TokenError();
+  FLATBUFFERS_CHECKED_ERROR ParseSingleValue(const std::string *name, Value &e, bool check_now);
+  FLATBUFFERS_CHECKED_ERROR ParseEnumFromString(const Type &type, std::string *result);
+  StructDef *LookupCreateStruct(const std::string &name,
+                                bool create_if_new = true,
+                                bool definition = false);
+  FLATBUFFERS_CHECKED_ERROR ParseEnum(bool is_union, EnumDef **dest);
+  FLATBUFFERS_CHECKED_ERROR ParseNamespace();
+  FLATBUFFERS_CHECKED_ERROR StartStruct(const std::string &name,
+                                        StructDef **dest);
+  FLATBUFFERS_CHECKED_ERROR StartEnum(const std::string &name,
+                                      bool is_union,
+                                      EnumDef **dest);
+  FLATBUFFERS_CHECKED_ERROR ParseDecl();
+  FLATBUFFERS_CHECKED_ERROR ParseService();
+  FLATBUFFERS_CHECKED_ERROR ParseProtoFields(StructDef *struct_def,
+                                             bool isextend, bool inside_oneof);
+  FLATBUFFERS_CHECKED_ERROR ParseProtoOption();
+  FLATBUFFERS_CHECKED_ERROR ParseProtoKey();
+  FLATBUFFERS_CHECKED_ERROR ParseProtoDecl();
+  FLATBUFFERS_CHECKED_ERROR ParseProtoCurliesOrIdent();
+  FLATBUFFERS_CHECKED_ERROR ParseTypeFromProtoType(Type *type);
+  FLATBUFFERS_CHECKED_ERROR SkipAnyJsonValue();
+  FLATBUFFERS_CHECKED_ERROR ParseFlexBufferValue(flexbuffers::Builder *builder);
+  FLATBUFFERS_CHECKED_ERROR StartParseFile(const char *source,
+                                           const char *source_filename);
+  FLATBUFFERS_CHECKED_ERROR ParseRoot(const char *_source,
+                                    const char **include_paths,
+                                    const char *source_filename);
+  FLATBUFFERS_CHECKED_ERROR DoParse(const char *_source,
+                                           const char **include_paths,
+                                           const char *source_filename,
+                                           const char *include_filename);
+  FLATBUFFERS_CHECKED_ERROR CheckClash(std::vector<FieldDef*> &fields,
+                                       StructDef *struct_def,
+                                       const char *suffix,
+                                       BaseType baseType);
+
+  bool SupportsAdvancedUnionFeatures() const;
+  bool SupportsAdvancedArrayFeatures() const;
+  Namespace *UniqueNamespace(Namespace *ns);
+
+  FLATBUFFERS_CHECKED_ERROR RecurseError();
+  template<typename F> CheckedError Recurse(F f);
+
+ public:
+  SymbolTable<Type> types_;
+  SymbolTable<StructDef> structs_;
+  SymbolTable<EnumDef> enums_;
+  SymbolTable<ServiceDef> services_;
+  std::vector<Namespace *> namespaces_;
+  Namespace *current_namespace_;
+  Namespace *empty_namespace_;
+  std::string error_;         // User readable error_ if Parse() == false
+
+  FlatBufferBuilder builder_;  // any data contained in the file
+  StructDef *root_struct_def_;
+  std::string file_identifier_;
+  std::string file_extension_;
+
+  std::map<std::string, std::string> included_files_;
+  std::map<std::string, std::set<std::string>> files_included_per_file_;
+  std::vector<std::string> native_included_files_;
+
+  std::map<std::string, bool> known_attributes_;
+
+  IDLOptions opts;
+  bool uses_flexbuffers_;
+
+ private:
+  const char *source_;
+
+  std::string file_being_parsed_;
+
+  std::vector<std::pair<Value, FieldDef *>> field_stack_;
+
+  int anonymous_counter;
+  int recurse_protection_counter;
+};
+
+// Utility functions for multiple generators:
+
+extern std::string MakeCamel(const std::string &in, bool first = true);
+
+// Generate text (JSON) from a given FlatBuffer, and a given Parser
+// object that has been populated with the corresponding schema.
+// If ident_step is 0, no indentation will be generated. Additionally,
+// if it is less than 0, no linefeeds will be generated either.
+// See idl_gen_text.cpp.
+// strict_json adds "quotes" around field names if true.
+// If the flatbuffer cannot be encoded in JSON (e.g., it contains non-UTF-8
+// byte arrays in String values), returns false.
+extern bool GenerateTextFromTable(const Parser &parser,
+                                  const void *table,
+                                  const std::string &tablename,
+                                  std::string *text);
+extern bool GenerateText(const Parser &parser,
+                         const void *flatbuffer,
+                         std::string *text);
+extern bool GenerateTextFile(const Parser &parser,
+                             const std::string &path,
+                             const std::string &file_name);
+
+// Generate binary files from a given FlatBuffer, and a given Parser
+// object that has been populated with the corresponding schema.
+// See idl_gen_general.cpp.
+extern bool GenerateBinary(const Parser &parser,
+                           const std::string &path,
+                           const std::string &file_name);
+
+// Generate a C++ header from the definitions in the Parser object.
+// See idl_gen_cpp.
+extern bool GenerateCPP(const Parser &parser,
+                        const std::string &path,
+                        const std::string &file_name);
+
+extern bool GenerateDart(const Parser &parser,
+                         const std::string &path,
+                         const std::string &file_name);
+
+// Generate JavaScript or TypeScript code from the definitions in the Parser object.
+// See idl_gen_js.
+extern bool GenerateJSTS(const Parser &parser,
+                       const std::string &path,
+                       const std::string &file_name);
+
+// Generate Go files from the definitions in the Parser object.
+// See idl_gen_go.cpp.
+extern bool GenerateGo(const Parser &parser,
+                       const std::string &path,
+                       const std::string &file_name);
+
+// Generate Php code from the definitions in the Parser object.
+// See idl_gen_php.
+extern bool GeneratePhp(const Parser &parser,
+                        const std::string &path,
+                        const std::string &file_name);
+
+// Generate Python files from the definitions in the Parser object.
+// See idl_gen_python.cpp.
+extern bool GeneratePython(const Parser &parser,
+                           const std::string &path,
+                           const std::string &file_name);
+
+// Generate Lobster files from the definitions in the Parser object.
+// See idl_gen_lobster.cpp.
+extern bool GenerateLobster(const Parser &parser,
+                            const std::string &path,
+                            const std::string &file_name);
+
+// Generate Lua files from the definitions in the Parser object.
+// See idl_gen_lua.cpp.
+extern bool GenerateLua(const Parser &parser,
+                      const std::string &path,
+                      const std::string &file_name);
+
+// Generate Rust files from the definitions in the Parser object.
+// See idl_gen_rust.cpp.
+extern bool GenerateRust(const Parser &parser,
+                         const std::string &path,
+                         const std::string &file_name);
+
+// Generate Json schema file
+// See idl_gen_json_schema.cpp.
+extern bool GenerateJsonSchema(const Parser &parser,
+                           const std::string &path,
+                           const std::string &file_name);
+
+extern bool GenerateKotlin(const Parser &parser, const std::string &path,
+                           const std::string &file_name);
+
+// Generate Java/C#/.. files from the definitions in the Parser object.
+// See idl_gen_general.cpp.
+extern bool GenerateGeneral(const Parser &parser,
+                            const std::string &path,
+                            const std::string &file_name);
+
+// Generate a schema file from the internal representation, useful after
+// parsing a .proto schema.
+extern std::string GenerateFBS(const Parser &parser,
+                               const std::string &file_name);
+extern bool GenerateFBS(const Parser &parser,
+                        const std::string &path,
+                        const std::string &file_name);
+
+// Generate a make rule for the generated JavaScript or TypeScript code.
+// See idl_gen_js.cpp.
+extern std::string JSTSMakeRule(const Parser &parser,
+                              const std::string &path,
+                              const std::string &file_name);
+
+// Generate a make rule for the generated C++ header.
+// See idl_gen_cpp.cpp.
+extern std::string CPPMakeRule(const Parser &parser,
+                               const std::string &path,
+                               const std::string &file_name);
+
+// Generate a make rule for the generated Dart code
+// see idl_gen_dart.cpp
+extern std::string DartMakeRule(const Parser &parser,
+                                const std::string &path,
+                                const std::string &file_name);
+
+// Generate a make rule for the generated Rust code.
+// See idl_gen_rust.cpp.
+extern std::string RustMakeRule(const Parser &parser,
+                                const std::string &path,
+                                const std::string &file_name);
+
+// Generate a make rule for the generated Java/C#/... files.
+// See idl_gen_general.cpp.
+extern std::string GeneralMakeRule(const Parser &parser,
+                                   const std::string &path,
+                                   const std::string &file_name);
+
+// Generate a make rule for the generated text (JSON) files.
+// See idl_gen_text.cpp.
+extern std::string TextMakeRule(const Parser &parser,
+                                const std::string &path,
+                                const std::string &file_names);
+
+// Generate a make rule for the generated binary files.
+// See idl_gen_general.cpp.
+extern std::string BinaryMakeRule(const Parser &parser,
+                                  const std::string &path,
+                                  const std::string &file_name);
+
+// Generate GRPC Cpp interfaces.
+// See idl_gen_grpc.cpp.
+bool GenerateCppGRPC(const Parser &parser,
+                     const std::string &path,
+                     const std::string &file_name);
+
+// Generate GRPC Go interfaces.
+// See idl_gen_grpc.cpp.
+bool GenerateGoGRPC(const Parser &parser,
+                    const std::string &path,
+                    const std::string &file_name);
+
+// Generate GRPC Java classes.
+// See idl_gen_grpc.cpp
+bool GenerateJavaGRPC(const Parser &parser,
+                      const std::string &path,
+                      const std::string &file_name);
+
+}  // namespace flatbuffers
+
+#endif  // FLATBUFFERS_IDL_H_