Squashed 'third_party/flatbuffers/' changes from acc9990ab..d6a8dbd26

d6a8dbd26 Experimental fix for failing oss-fuzz coverage build (#6259)
ed391e177 BREAKING: Rust flexbuffers serde human readable set to false (#6257)
a49531414 Update to flags in fuzzing-cmake file (#6256)
de1f0342c Remove _POSIX_C_SOURCE and _XOPEN_SOURCE definitions when compiling o… (#6205)
d0d51e2a5 flatc should support --binary --schema with optional scalar fields. (#6252)
33ab26017 Bump version of rules_go to 0.24.5 (#6234)
febb9d87c Union As Accessors for C# (#6251)
8778dc7c2 Resets buffer without deallocating current pointer (#6247)
aae376e9a Add GetBufferSpan() function to bufferbuilder (#6235)
0ff047148 Modernize android build and sample (#6229)
46a8c7e95 Added required-nested-flatbuffer to monster_test and fixed rust (#6236)
bc56c553e Notify based on Labelling issues and PR (#6241)
07d7cd78a Converted globs to use single quotes (#6240)
cdef70e24 More adjustments to the auto labeler (#6239)
9dd44df35 Updated Lua labeller glob (#6238)
c9b29d088 Support size-prefixed buffers and add tests for size-prefixed messages (#6232)
fba93e0ab Removes duplicate swift in labeler (#6228)
d1a545b1f Added more labels for auto labeler (#6227)
ea92a668d [C#] Optional Scalars (#6217)
6034de286 [Label Bot] Add Java and Kotlin support for the label bot (#6226)
b08b0a440 Implement `Debug` trait for Rust flatbuffers. (#6207)
17ae48dec [Label Bot] Adds some languages to labeler bot (#6222)
fc8097925 Auto Labeler Setup, Just C# for now (#6221)
55658f523 Auto Labeler Setup, Just C# for now (#6218)
14ecfe423 Updated comments and fixed a fundamental type error. (#6214)
a0182cdb1 optional scalars for ts/js (#6215)
0dfcc0a37 Adds NetTest.bat to run .NET Core tests on Windows (#6216)
f9a18ea63 [Java] Implement optional scalars (#6212)
c7586e85a Empties the sharedString map on reset on go and csharp (#6187)
914c64601 Removed C# references from java generator. Move annotations closer to definitions (#6204)
42d7c7997 Adds readable size to asserts in read functions (#6210)
e68e8d7de Refactor idl_gen_rust (#6206)
84809be7e Fix typo in flatbuffers::span declaration. (#6202)
1606fb637 Kotlin test optional enum (#6201)
fe8e3c7e5 Mass Refactoring to use `IsString` and other BASE_TYPE helpers (#6193)
8f6fa4b71 Updated SupportsAdvancedUnionFeatures to look out for string (#6190)
b46db38f5 [JS/TS] Rewrite flexbuffers JS to TS (#6148)
9fa1d2705 Rework enums in rust. (#6098)
a402b3aba idl_gen_json_schema Fix generation of arrays of enums (#6184)
0e1415b99 fix(go_test): remove deprecated grpc call (#6183)
5cd713710 Add generation of JSON Schema to library (#6165)
5be777e1d Bump junit from 4.12 to 4.13.1 in /grpc/tests (#6173)
a49d440ec Bump junit from 4.12 to 4.13.1 in /grpc (#6172)
4ec5e8db9 [C++] Add option to not generate direct copy methods. (#6166)
04bec23a3 Add Array initialization from struct constructor (#5865) (#6147)
77d57fd07 Cast to right type for reserved_ subtraction (#6167)
543c1bbeb Fixed rust nested flatbuffers for tables other than self (#6062)
cb971eece [C++] Fix -Wnarrowing and -Woverflow due to signed bitfields on G++ ARM (#6163)
7b9e61fcc [TS] GRPC  Implementation (#6141)
3359e3042 Moved C++ to optional_scalars2 and added some tests. (#6162)
187a4787f [Rust] Upgrade flatbuffers library to 2018 edition (#6159)
08943aa26 Flatbuffer C++ UnpackTo optimization for vectors of non-bool bytes. (#6154)
5975658eb Enables optional enums in swift (#6160)
5d3cf440e Updated Lobster test for optional bools/enums
8ec8322f0 Ruopt enum (#6156)
bbcc85fd4 Fix generation of C++ code with Optional<Enum> (#6155)
0bdf2fa15 [C#] Fix and improve project files (#6142)
2eedc769d possibility to create a vector from an iterator (#6135)
ab01ae162 flatc should output a warning, when an attribute is attached more than once (#6146)
689bfafa7 [Python/JS/TS] Codegen SizeOf method for structs (#6136)
641309a5b unix2dos on tests/FlatBuffers.Test/FlatBuffers.Core.Test.csproj (#6133)
52e362879 SpanT is available in .Net Standard 2.0. (#6137)
dca12522a Add static cast to avoid implicit double promotion. (#6132)
e0bbaa6f9 [C#]Change to ENABLE_SPAN_T that doesn't require UNSAFE_BYTEBUFFER. (#6073)
ab139d6be Revert "[C#] Fix and improve project files (#6116)" (#6130)
34d67b425 Minireflect fixed array (#6129)
96d5e3597 [JS/TS] fix flatbuffers default export (#6123)
eb686a86f Add missed file generated by optional_scalar.fbs (#6125)
750281630 [C#] Fix and improve project files (#6116)
fb4e1c34f Add CharToLower and CharToUpper into util.s (#6126)
8c67b5b12 Add support of Optional<T> scalars to C++ code generator (#6092)
6228b66d3 [Kotlin] Support for optional scalars. (#6115)
e1be8aaad Bump version for latest swift version (#6121)
94873e595 [JS/TS] Modernize TypeScript / JavaScript flatbuffers support (#6095)
b8e87fafe [JS] Add getFullyQualifiedName() (#6119)
f96d1ef74 [Java] allowing larger buffer sizes when growing a byte buffer (#6118)
89435303b [Swift] Migrates struct write APIS to write directly to the buffer (#6093)
c75ae2429 Optional-ness in reflection (#6097)
338944d3d Rename Nullable scalars to Optional scalars (#6112)
f5ab24bc4 Avoid memcpy call for empty vectors (#6111)
92a8c1a0f [JS] FlexBuffers Fix for wrong type of offset and length values (#6107)
6cea45dcd fix c# json serializer commandline argument docs (#6104)
fec58aa12 Fix for issue 6100: incorrect shrinking logic in ResizeContext() (#6102)
71aca81ff [JS] FlexBuffers Support (#5973)
04d87ffec [C++] Small refactoring of the C++ code generator (#6091)
bb25956f0 Wrap verify file id condition in Check call (#6085)
49f4948f0 + Add `removable-media` plug to the snapcraft config (#6083)
eeacc53d2 Adds proper access types for swift object api & flatbuffers & grpc (#6081)
f3003e08d [Lobster] missed a test
d713a0084 [CMake] enabled multi-core builds in VS projects
77f966f89 [Lobster] optional scalars support
e86d5b8e9 [Kotlin] Attach JvmStatic annotation to each method in companion object (#6052)
db2aa9b4e [C#] Cleaned up .NET testing script for Mono (#6016)
63cc0eec4 Adds a serialize helper function to native table (#6059)
c30a87de6 [TS] Fix four bugs with imported types in TypeScript. (#6054)
a0fb30575 [Swift] Append namespace for Swift Grpc implementation (#6049)
77c18c1d6 export a __version__ variable for python module (#5309)
f1f23d08e adding fb import when no other imports are present (#6030)
f1025b284 [Feature] Checks for Nullable strings (#6050)
5d052f4e5 [Swift] RFC: Switch Swift namespace from public enum to ordinary concat with _ (#6045)
18b015d25 Rust codegen improvements and lint fixes (#6046)
d76e93f27 adds code gen for optional scalars in swift (#6038)
82fac326c [C++] Fix compiler error from deleted assignment operator (#6036) (#6047)
043b52bd4 Optional Scalars support for Rust (#6034)
c8fa0afdf Allow to run cpp tests under grpc/tests/ using bazel. (#6040)
6d0aae73c Fix git command executed in wrong folder when doing cmake superbuild (#6039)
ff1b73128 [Swift] Optional Scalars Preparation (#6028)
2e48c8dd3 tests: Check for both quiet and signaling NaN on mipsel/hppa (#6029)
6942704f2 support deprecated flag in json schema (#6022)
9ecd2e16c Flatc parser support for nullable scalars (#6026)
33e2d8079 [Dart] Generate constant values map for enums (#6025)
969d0f7a6 Using proper symbol name for reexport (#6021)
515a4052a Silence false positive "-Wstringop-overflow" on GCC 10.0 to 11.0 (#6020)
36fbe6f13 Updated FB import (#6019)
b69fc8cc9 [Java] Add support for shared strings on FlatBufferBuilder. (#6012)
ab6af18d9 Not using non-existent create method for obj api (#6015)
37a5dee10 Code cleanup + updates test and readme (#6004)
8a721f69a Serde with bytes maps to Blob (#6009)
e810635ea [Swift] FlatBuffers createMonster method doesn't treat struct properly (#5992)
4995e1527 Manage grpc dependency in Bazel's WORKSPACE file. (#5995)
60b6066fe Add warning to schema parser if field name is not snake_case. (#6005)
35d45cac7 [Rust] Flexbuffers dependency cleanup and fixes (#5998)
165a6e3d1 Re-added Evolution Schema Code Generation Command (#5999)
13d3fb2ea Fix RPM install conflict (#6003)
d64078eb2 [Swift] Initialize memory when clear ByteBuffer (#5982)
ca1190a3d [TS] Use proper TypedArray in create*Vector (#5991)
7571b2ac5 [C++] Updates real_path to be truly portable (#5787)
e5a8f76a4 [C++] Generate default member initializers for >= C++11 (#5989)
413bb9b55 [Kotlin] Fix Access to union of vector element (#5994)
f35184aef [Swift] Add parsing from unowned UnsafeMutableRawPointer for ByteBuffer (#5981)
b124b7625 Removed requirement that enums be declared in ascending order. (#5887)
0ec7600c6 Do not remove the last digit from float values (#5974)
14baf45c9 Mark GetBufferMinAlignment() const (#5985)
9abb2ec2c TypeScript/JavaScript docs improvements (#5984)
2e57d80b1 [Swift] Internal library improvements (#5965)
cfc7753a4 [Doc] Added missing letters to compiler options (#5976)
12ddc8a92 Rust Flexbuffers Documentation update (#5979)
24ad35709 [docs] typo: updates monsterdata.json to be valid json (#5978)
cc44a4442 [idl_parser] Mark typefield as deprecated (#5958)
9ab4a5c0e Deleted old stale bot
6682cfe87 Increased Operations per run in stale.yml
64922904b Adding Stale Action to clean up PR and Issues
8e505cb67 [C++] Fixed/Enabled --cpp-ptr-type std::shared_ptr [#5813] (#5959)
a28357d7a Propagate boolean default values from proto to fbs (#5964)
7cb4762a6 [Swift] Improving reallocation time by using memcpy and moving reallocation code to storage (#5960)
4e45f7c9e Fix error in SimpleQSort (#5955)
7ac026405 fix error on GRPC Python - ignore namespace tree if not specified (#5862) (#5922)
108e981db Required is now implemented in swift (#5952)
94a78e385 Fixed: Access violation and ASAN/UNSAN failures with sorted tables
53fb453e0 [rust] Add FlatBufferBuilder::force_defaults API (#5946)
17c1f35fa [FlexBuffer][Java] ReadWriteBuf and ReadBuf interface public (#5948)
2eaf57778 [Java] Grow ArrayReadWriteBuf enough to match requested capacity. (#5921)
666800da3 Adds bool support in structs + updates grpc support + CI upgrades (#5943)
38ed69eb3 fixed mutating inline values (#5942)
d026e6f07 Add static asserts to ensure that reflection API arrays are kept in sync (#5934)
988164f6e [C++] Got rid of memset's in constructors (#5938)
7179a5a8b General Codebase clean up (#5939)
a0da0c08c Add GetStringView like GetString, GetCstring (#5937)
ac203b209 [C#] Add file identifier to ObjectAPI Serialization Utility. (#5920)
8dd1bf25b not creating creation methods when using structs (#5919)
5aa443d98 [Dart] Adding FlexBuffers support (#5853)
0fa087657 [Dart] Getting tests/DartTest.sh to work on master. (#5915)
424a473e1 Schema parser: prohibit declaration of an array of pointers inside structs (#5907)
c3faa8346 Fix Cargo.toml dependencies (#5911)
91399ad05 fix union type names (#5902)
32782e4ad Update Rust Flexbuffers metadata before publishing (#5905)
e7f3b1690 [TS] Make Obj-API work with --short-names (#5898)
12ed1fe4a fixed invalid imports with --gen-all (#5895)
85ee4df7a [C#] Thread safe reads of Double and Float values from a ByteBuffer (#5900)
de89bd193 Implement flexbuffers in python (#5880)
8be05f6bd Rust Flexbuffers (#5669)
870ecbc09 [swift] Moves code to use VTablesStorage (#5888)
c2da8d5d8 [Java][FlexBuffers] Make FlexBuffersBuilder reusable by adding clear() (#5889) (#5890)
e84cbff67 Align package name to FindFlatBuffers.cmake (#5899)
f94e6c84e Small tutorial improvements - documentation only (#5894)
f12cca8bc Attempt at adding Github Actions CI
7e4124d6e Handle git program or .git folder absence (#5878)
a875d247a only add native_include_files if object based api is enabled (#5886)
6e9f5d981 Respect shared attribute in Parser (#5885)
ff1c78233 include/flatbuffers: typo fixes in comments (#5884)
2e9a19673 Updates swift docs for package management (#5883)
e3cb07d32 [Rust] idl_gen_rust.cpp: (Option/required-aware codegen for unions) (#5850)
712866d57 Propagate use_string_pooling in CopyTable (#5879)
44c919a9e Not using reexports with --gen-all (#5873)
99aa1ef21 Added INCLUDE_PREFIX option for flatbuffers_generate_headers (#5866)
40ba170c9 Fixed text in internals doc that implied structs can be root
cb4d0f72e [Swift] Object API support  (#5826)
003e16405 [TS] Add Obj API (#5788)
21cf300f4 fix cpp usage markdown error (#5845)
9655e12d6 Upgraded swift implementation for grpc (#5843)
fb96fadc2 [C#] Fix nested structs and arrays in Object API (#5765)
408f11fbd [ts] Fix empty source/dest namespaces when reexporting. (#5841)
a83caf591 Improves performance for the swift library by using structs + a storage class (#5835)
925fab6b1 [Java][FlexBuffers] Optimize Map access (#5735)
d9fecc332 [CMake] : Add precompiled header support with FLATBUFFERS_ENABLE_PCH (#5827)
e9d453240 Added flatbuffers_generate_headers and flatbuffers_generate_binary_files cmake functions. (#5830)
c37c989ed Correct calculation of vector element size (#5831)
6b271b7ec Fix Clang-trunk warnings about special members deprecated in C++20. (#5829)
90f3b8e8c Fix `float_constant` definition in './doc/Grammar.md` (#5828)
3af735934 [csharp] flatc should generate a 'Create…' method for tables with struct field… (#5818)
c4231c3cb Updated doxyfile - added missing files (#5824)
9657df184 Update Grammar.md (#5820)
97ffc590e Include CPack only when explictly packaging (#5817)
8b52af65b [C++] Add max_depth and max_tables parameters to reflection::Verify (#5815)
9b034eee1 Fix interpretation of 'nan(number)' by the idl_parser (#5810)
3e9ac3cff [Scripts] Adds swift to generated code (#5806)
697147a2e updated maven build files
6df40a247 pre-tag version bump for 1.12
0dba63909 Removes the inner loop in the endtable check written tables (#5803)
0e3fdd0ee Escape characters in jsonschema descriptions (#5644)
45a2b07cb Remove `noexcept` qualifier copy-ctor of `union` type (#5800) (#5802)
d10c16314 Replace 'assert' by 'FLATBUFFERS_ASSERT' inside idl_parser.cpp (#5799)
35abb7f89 Add non-nullable modifier to return type of functions never returning null (#5797)
9954e09ab [C++] Generate code for vector force_align attribute. (#5796)
95a21327f rust: pub export the VectorIter type (#5736)
89b6183ee Fix Python min alignment
5a98d65e8 [Rust] Add gen-name-strings for Rust (#5757)
f73d205bc Removed assert that wasn't backwards compatible.
7c37abe92 [C#] add ObjectAPI Serialization Utility (#5785)
4749e77b0 Fixed docs on how to obtain parser error.
6ff189841 Added --filename-suffix and --filename-ext to flatc (#5778)
c9a30c9ca Fixed refractoring issue in reflection/generate_code.sh. Also, mv deletes the original file, so I don't need to clean it up manually in that case. (#5777)
8c02d17be Skip writing reflection_generated.h if not changed (#5776)
34305c4ce [Swift] Adds GRPC to Swift (#5758)
cd88e6b2a [Java][FlexBuffers] Abstract buffer access from ByteBuffer (#5743)
3ec7a53c6 Adds cocoapods and a readme of how to get the package (#5771)
6d44cede7 [snap] Fix versioning (#5727)
cc08c0835 [Python] Fixed potential allignment issue (#5768)
54f8b787c Fix memory leak on cpp object api (#5761)
17557f913 [Python] Fixed issue #5499 (#5764)
d54af8cd4 [C++] Use strong enum type for vectors when scoped-enums is on. (#5750)
173e10fdf [C#] support Json Serialization (#5752)
8f56990f6 FlexBuffers: C++: scalar-only typed vectors were not aligned.
6400c9b05 Bump Rust port to 0.6.1 (#5747)
7418d8587 [C#] support Object API (#5710)
c580fa284 Adds min and max, comments, and all of swift's keywords + fix docs (#5737)
f2a127230 Use VS 2017 and 2019 on CI, fix cast issue in dart_idl (#5740)
316d7c208 Creates a flatbuffers validation function + small fix (#5725)
47026ea6b Added the code to embed the binary schema to the source (--bfbs-gen-embed). (#5701)
3f677f241 [Java][FlexBuffers] Deprecate typed vector strings due to design flaw (#5722)
a593a11e5 [Go] Implements a SharedStrings function (#5733)
7cdfc8475 [Swift] Fix padding function overflow when bufSize is 0 (#5721)
bab2b0db4 Add vcpkg installation instructions (#5732)
89418eb84 [Dart] Fix deprecated field support, inf/nan (#5724)
9cadf05d8 [typescript] Size-prefixed root accessors not taking into account size prefix (#5717)
6da1cf79d [rust] Add use declarations to Rust-generated bindings for imported FB definitions (#5645)
bee1df96d [Go] Replace references to hardcoded ”Monster" etc with idiomatic go wherever possible (#5716)
01189d7ed [C++] Fix for printing of enum in case output_enum_identifiers=1. (#5706)
c4b2b0a25 [Swift] Support create long string (#5709)
a4b2884e4 Added create function for swift (#5707)
04d80f255 [Swift] Swift implementation 🎉🎉 (#5603)
55686100a Changed direct calls to strtod to use StringToNumber
718351831 Document JSON compatibility guarantees. (#5704)
d1b34f0f2 Add CMake 'generated_code' target to simplify resolution of build dependencies (#5697)
21b706196 (Optionally) add an additional suffix namespace to generated fbs files. (#5698)
35daaf83d [Java] Replace Table.UTF8_CHARSET with StandardCharsets.UTF_8 (#5696)
3b458f7a1 Rust: Temporarily disable 2 endianness unit tests (#5695)
a5d9d0f7d [C++17] Add Traits class for Tables and Factory function within it. (#5678)
3cd9b6434 Removed code_generators.cpp from library targets
355dfd48d [rust] Make enum names public (#5690)
bcd58a159 Correct inverted logic around include prefixes. (#5689)
a2c12900a Optimize Pack method using numpy (#5662)
901b89e73 [C++] Add Builder and Table typedefs (#5685)
31f879908 Minor doc updates: FlexBuffers C#, Discord, CppUsage.
8023d99e2 Upgrade rules_go (#5684)
b4154405d Fix --incompatible_load_cc_rules_from_bzl (#5683)
04c17c7a7 Add support for absl::string_view when available (#5682)
62ec7d52c [Bazel] Add support for compatible_with and restricted_to (#5681)
7de668053 CI: New Docker tests for Python with numpy (#5677)
3a70e0b30 Fixed struct initialization error on older versions of C#
9b1320135 Fixed warnings in FlexBuffers.java
5e3916050 Fixed out of date licenses on gRPC Python files.
c95755051 Removed test proto output.
44bf71988 Add flatc '--cpp_std' switch (#5656)
3e8f15df9 Fix for FlexBuffers FBT_VECTOR_STRING size bit-width.
602721a73 Added Check to VerifyAlignment (#5675)
13c05f4da Improve import handling for proto conversion (#5673)
ce3a1c43a [Dart] Fix prepare space for writeListInt64 and writeListUint64 (#5654)
aa75e5734 Make Rust constants public (#5659)
2790fee25 Add namespace qualification to union types (#5666)
eddebec1b Bugfix for Rust generation of union fields named with language keywords (#5592)
030fee36a wrap multiple statements in do {} while(!IsConstTrue(true)) (#5655)
f9724d1bd [gRPC] Uncomment MessageBuilder (#5658)
b20801ca4 Supress unsigned-integer-overflow for PaddingBytes (#5647)
a8e800bd7 Add --force-empty-vectors option (#5653)
d7530ae96 Fixed enum min/max values not properly escaped.
99d11e279 Split Bazel targets into multiple packages (#5640)
4fd8eb214 Remove a static_assert (#5643)
65f870357 Flatbuffers Python Object API (#5616)
75823cc27 [Clang 10]: definition of implicit copy constructor for 'TableKeyComparatoris deprecated #5649 (#5650)
58e279244 [docs]: add missing semicolon (#5648)
3c964e10a [GO] Fix support for enums with underscores and Unions with imported members (#5600)
c3c32ec94 Fix ambiguity of a type deduction in TEST_EQ macro if arguments have `enum class` type. (#5630)
075e8d676 Simplify declarations of x-macro FLATBUFFERS_TD (#5638)
bcf1bd5c9 read vtable size through ReadScalar() (#5636)
136d75fa6 Changed null checks in test. Removed verifier pointer usage (#5634)
091fa1fd1 Add testing of C++ with sanitizers (CI-Docker) (#5631)
ff3781dc2 add namespace prefix in FLATBUFFERS_MAX_BUFFER_SIZE (#5629)
6beb9f49c Support for python grpc - continuing the work from the pull request #4270 #4705 (#5613)
80988ea86 Removed idl_gen_general.cpp and move contents to code_generators.cpp (#5625)
0f2ff7eaa Lua cleanup (#5624)
dda095023 [C++] Adds basic schema evolution tests (#5611)
adbcbba5d [C++, C#, Java] Separated C# and Java generators into their own classes (#5618)
cbbd6aca0 add check for root_type specified for json schema generation (#5622)
405c64e07 [Rust] Bump smallvec version to 1.0 (#5621)
42c08cbca Ran src/clang-format-all.sh (#5617)
33d5dd9bd Improved pull request & clang-format instructions.
105dd528e Change monster_extra generation to use flatbuffers::unique_ptr (#5612)
f0f0efe7b [C++] Refactor to conform to Google C++ style guide (#5608)
e837d5a29 Fixed deprecated method in GRPC Java test.
9834ee978 Fixed Apache license not using canonical version.
44b2ab087 include/flatbuffers/base.h: fix no_sanitize issue with old clang (#5610)
46ae3f80a [C++, Java, C#, TypeScript, JavaScript] Skip generation of mutable union types (#5599)
7b38aa71e flatbuffers.h: fix documentation warning (#5607)
661bedd83 Add Lua FlatbufferBuilder Clean() method to enable reuseable builders (#5606)
8526e12d7 [Kotlin] Fix union vector accessor after change in Java API (#5605)
3c7b660d6 [flatc] Remove an always true condition for flexbuffers (#5604)
964365ba6 [Go] Add UnPackTo functions (#5598)
32254b7ac [Go] Object API support (#5339)
521e255ad Rust: Add idiomatic iterator for Vector type (#5579)
1b85292fd Fix typos in comments (#5590)
480815447 C++ verifier for evolved union fields should return true (#5586)
8d5e424c6 Add ByteBuffer copy for vector of bytes in Java (#5587)
b4774d235 Rust: Fix Copy and Clone impls for a few generic types (#5577)
26f238c24 Add `--clean-first` to the cmake-build command (travis) (#5574)
e93c8c46e Fix Follow implementation for bool (#5554)
e21516b9d Fix issue #5557 (#5573)
fbc11e8ae Avoid intentional unsigned integer overflow getting caught by sanitizers (#5572)
e9d29c21a Python: Add forceDefaults opt to python Builder (#5564)
8bfafc76d Java: Don't annotate vector-of-tables item getters with @nullable. (#5562)
df3e8bf4a Fixed warnings generated by recent JSON sorting feature.
5665cfe49 [Java] byte buffer factory returned buffer capcity is used instead of the requested size (#5558)
5797540ed #5544 Fix of Array of table is not sorted if Create<type>Direct() is used (#5546)
7f1af7cb0 Fix build with gcc version 7.4.0 (#5570)
32f47ad24 Fixed JSON parser not sorting vectors of tables/structs with key.
842f672ba [FlexBuffers][Java] Cache size of Sized objects in FlexBuffers (#5551)
d4cae0a62 Fix issue #5542 (#5543)
f1147f65b Fixed Android STLPort related error.
69d3fec48 Fix namespaced struct/field name collision detection (#5540) (#5545)
cfb4ecf6f [flac] Add FlexBuffers option for generating data (#5519)
a92039687 Update Rust versions under test from 1.30.1 to 1.37.0 (#5538)
625338d09 Adds XOPEN_SOURCE for PATH_MAX and POSIX 1993 for stat (#5529)
3f8ce99c5 [FlexBuffers][Java] Add override Key::toString (#5533)
0798b7b69 [FlexBuffers][Java] Fix wrong access to a string using Reference::asString(). (#5532)
cbdf82e2f Fix Mutate() methods of Array<scalar/struct> (override 5508) (#5526)
e365c502f Java: Added access object for vector of struct and vector of tables. (#5233)
97f3aa917 Fixed DetachedBuffer self move assignment (#5521)
2f5bb2eec Fix buildifier warnings found in new bazel (#5517)
917687c7a Fixed Reflection Verifier not handling vectors of unions.
f9277e691 Fixed GenerateText not handling vectors of unions.
2706381ee Add element size parameter to __vector_as_arraysegment [c#] (#5512)
b5560fcd5 [Java][FlexBuffers] Improve documentation for FlexBuffers in Java. (#5506)
782b865c5 Annotate getters with @Pure when --java-checkerframework is specified. (#5510)
3bfc86eaf [Dart]fix: segment fault with empty namespace when generating dart file (#5507)
c0282873f Rust: Fixed cargo clippy on non-generated code (#5485)
4b870aca9 [Javascript] Fix syntax error for signed enum (#5503)
d0e3870c0 [C#] Fix retrieving enumeration vectors as arrays (#5457)
fb25eb87f Doc typo fixes (#5505)
cb35d3a0e Use all of the available space in the buffer returned by ByteBufferFactory to allow the factory to keep a pool of larger than initialsize sized buffers. (#5500)
8e6cabb31 [FlexBuffers][Java] Implementation of FlexBuffers API (#5476)
bd31dd242 Clarified value reuse in FlexBuffers
65b67d213 Fixed test build invocation of arrays_test.fbs
1fbb71132 FlexBuffers: allow any values to be shared.
cd75a3658 Android: remove app_dummy() calls
ec6b0bf29 Fixed STLPort Android compile error
c11b5d744 [bugfix]flexbuffers isvector bugfix (#5488)
4525c91be Fix incorrect padding in arrays of structs (Issue #5484) (#5491)
b97b342f5 Fixed missing generated code.
c1058a903 C++ IDL generation adds superfluous semicolon in GenTablePost, causing (#5483)
303044934 [go]add Name() for ForceCodec  interface (#5486)
a2485d4ec reflection: check for valid union enum value during object verification (#5475)
a20e71ac9 has_method support for primitive fields in java runtime. Changed: idl.h, FlatBufferBuilder.java ,  idl_gen_general.cpp, idl_parser.cpp, flatc.cpp (#5468)

Change-Id: I836f4b43e6818bb16425a87899e6234ac86242aa
git-subtree-dir: third_party/flatbuffers
git-subtree-split: d6a8dbd26ff08a8868e0d0c1b4b67d31b40e4a7f
diff --git a/include/flatbuffers/idl.h b/include/flatbuffers/idl.h
index 44e3566..a28745f 100644
--- a/include/flatbuffers/idl.h
+++ b/include/flatbuffers/idl.h
@@ -47,26 +47,26 @@
 // 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 */
+  TD(NONE,   "",       uint8_t,  byte,   byte,    byte,   uint8,   u8,   UByte, UInt8) \
+  TD(UTYPE,  "",       uint8_t,  byte,   byte,    byte,   uint8,   u8,   UByte, UInt8) /* begin scalar/int */ \
+  TD(BOOL,   "bool",   uint8_t,  boolean,bool,    bool,   bool,    bool, Boolean, Bool) \
+  TD(CHAR,   "byte",   int8_t,   byte,   int8,    sbyte,  int8,    i8,   Byte, Int8) \
+  TD(UCHAR,  "ubyte",  uint8_t,  byte,   byte,    byte,   uint8,   u8,   UByte, UInt8) \
+  TD(SHORT,  "short",  int16_t,  short,  int16,   short,  int16,   i16,  Short, Int16) \
+  TD(USHORT, "ushort", uint16_t, short,  uint16,  ushort, uint16,  u16,  UShort, UInt16) \
+  TD(INT,    "int",    int32_t,  int,    int32,   int,    int32,   i32,  Int, Int32) \
+  TD(UINT,   "uint",   uint32_t, int,    uint32,  uint,   uint32,  u32,  UInt, UInt32) \
+  TD(LONG,   "long",   int64_t,  long,   int64,   long,   int64,   i64,  Long, Int64) \
+  TD(ULONG,  "ulong",  uint64_t, long,   uint64,  ulong,  uint64,  u64,  ULong, UInt64) /* end int */ \
+  TD(FLOAT,  "float",  float,    float,  float32, float,  float32, f32,  Float, Float32) /* begin float */ \
+  TD(DOUBLE, "double", double,   double, float64, double, float64, f64,  Double, 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)
+  TD(STRING, "string", Offset<void>, int, int, StringOffset, int, unused, Int, Offset<String>) \
+  TD(VECTOR, "",       Offset<void>, int, int, VectorOffset, int, unused, Int, Offset<UOffset>) \
+  TD(STRUCT, "",       Offset<void>, int, int, int,          int, unused, Int, Offset<UOffset>) \
+  TD(UNION,  "",       Offset<void>, int, int, int,          int, unused, Int, Offset<UOffset>)
 #define FLATBUFFERS_GEN_TYPE_ARRAY(TD) \
-  TD(ARRAY,  "",       int,          int, int, int,          int, unused, Int)
+  TD(ARRAY,  "",       int,          int, int, int,          int, unused, Int, Offset<UOffset>)
 // The fields are:
 // - enum
 // - FlatBuffers schema type.
@@ -91,6 +91,20 @@
 }
 */
 
+// If not all FLATBUFFERS_GEN_() arguments are necessary for implementation
+// of FLATBUFFERS_TD, you can use a variadic macro (with __VA_ARGS__ if needed).
+// In the above example, only CTYPE is used to generate the code, it can be rewritten:
+
+/*
+switch (type) {
+  #define FLATBUFFERS_TD(ENUM, IDLTYPE, CTYPE, ...) \
+    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) \
@@ -101,17 +115,15 @@
 __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,
+  #define FLATBUFFERS_TD(ENUM, ...) \
+    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);
+#define FLATBUFFERS_TD(ENUM, IDLTYPE, CTYPE, ...) \
+  static_assert(sizeof(CTYPE) <= sizeof(largest_scalar_t), \
+                "define largest_scalar_t as " #CTYPE);
   FLATBUFFERS_GEN_TYPES(FLATBUFFERS_TD)
 #undef FLATBUFFERS_TD
 
@@ -227,7 +239,7 @@
 struct Namespace {
   Namespace() : from_table(0) {}
 
-  // Given a (potentally unqualified) name, return the "fully qualified" name
+  // Given a (potentially 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.
@@ -284,6 +296,7 @@
         shared(false),
         native_inline(false),
         flexbuffer(false),
+        optional(false),
         nested_flatbuffer(NULL),
         padding(0) {}
 
@@ -292,6 +305,10 @@
 
   bool Deserialize(Parser &parser, const reflection::Field *field);
 
+  bool IsScalarOptional() const {
+    return IsScalar(value.type.base_type) && optional;
+  }
+
   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.
@@ -302,6 +319,8 @@
   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.
+  bool optional;       // If True, this field is Null (as opposed to default
+                       // valued).
   StructDef *nested_flatbuffer;  // This field contains nested FlatBuffer data.
   size_t padding;                // Bytes to always pad after this field.
 };
@@ -338,45 +357,12 @@
   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;
+  Offset<reflection::EnumVal> Serialize(FlatBufferBuilder *builder,
+                                        const Parser &parser) const;
 
   bool Deserialize(const Parser &parser, const reflection::EnumVal *val);
 
@@ -431,10 +417,7 @@
 
   size_t size() const { return vals.vec.size(); }
 
-  const std::vector<EnumVal *> &Vals() const {
-    FLATBUFFERS_ASSERT(false == vals.vec.empty());
-    return vals.vec;
-  }
+  const std::vector<EnumVal *> &Vals() const { return vals.vec; }
 
   const EnumVal *Lookup(const std::string &enum_name) const {
     return vals.Lookup(enum_name);
@@ -455,6 +438,52 @@
   SymbolTable<EnumVal> vals;
 };
 
+inline bool IsString(const Type &type) {
+  return type.base_type == BASE_TYPE_STRING;
+}
+
+inline bool IsStruct(const Type &type) {
+  return type.base_type == BASE_TYPE_STRUCT && type.struct_def->fixed;
+}
+
+inline bool IsUnion(const Type &type) {
+  return type.enum_def != nullptr && type.enum_def->is_union;
+}
+
+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) {
+  if (IsStruct(type)) {
+    return type.struct_def->minalign;
+  } else if (IsArray(type)) {
+    return IsStruct(type.VectorType()) ? type.struct_def->minalign
+                                       : SizeOf(type.element);
+  } else {
+    return SizeOf(type.base_type);
+  }
+}
 inline bool operator==(const EnumVal &lhs, const EnumVal &rhs) {
   return lhs.value == rhs.value;
 }
@@ -470,7 +499,8 @@
 }
 
 struct RPCCall : public Definition {
-  Offset<reflection::RPCCall> Serialize(FlatBufferBuilder *builder, const Parser &parser) const;
+  Offset<reflection::RPCCall> Serialize(FlatBufferBuilder *builder,
+                                        const Parser &parser) const;
 
   bool Deserialize(Parser &parser, const reflection::RPCCall *call);
 
@@ -478,7 +508,8 @@
 };
 
 struct ServiceDef : public Definition {
-  Offset<reflection::Service> Serialize(FlatBufferBuilder *builder, const Parser &parser) const;
+  Offset<reflection::Service> Serialize(FlatBufferBuilder *builder,
+                                        const Parser &parser) const;
   bool Deserialize(Parser &parser, const reflection::Service *service);
 
   SymbolTable<RPCCall> calls;
@@ -486,6 +517,9 @@
 
 // Container of options that may apply to any of the source/text generators.
 struct IDLOptions {
+  bool gen_jvmstatic;
+  // Use flexbuffers instead for binary and text generation
+  bool use_flexbuffers;
   bool strict_json;
   bool skip_js_exports;
   bool use_goog_js_export_format;
@@ -508,7 +542,9 @@
   std::string cpp_object_api_pointer_type;
   std::string cpp_object_api_string_type;
   bool cpp_object_api_string_flexible_constructor;
+  bool cpp_direct_copy;
   bool gen_nullable;
+  bool java_checkerframework;
   bool gen_generated;
   std::string object_prefix;
   std::string object_suffix;
@@ -519,6 +555,7 @@
   bool keep_include_path;
   bool binary_schema_comments;
   bool binary_schema_builtins;
+  bool binary_schema_gen_embed;
   bool skip_flatbuffers_import;
   std::string go_import;
   std::string go_namespace;
@@ -528,7 +565,13 @@
   bool size_prefixed;
   std::string root_type;
   bool force_defaults;
+  bool java_primitive_has_method;
+  bool cs_gen_json_serializer;
   std::vector<std::string> cpp_includes;
+  std::string cpp_std;
+  std::string proto_namespace_suffix;
+  std::string filename_suffix;
+  std::string filename_extension;
 
   // Possible options for the more general generator below.
   enum Language {
@@ -548,6 +591,7 @@
     kLobster = 1 << 13,
     kRust = 1 << 14,
     kKotlin = 1 << 15,
+    kSwift = 1 << 16,
     kMAX
   };
 
@@ -561,12 +605,18 @@
   // 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;
+  // If set (default behavior), empty string fields will be set to nullptr to
+  // make the flatbuffer more compact.
+  bool set_empty_strings_to_null;
+
+  // If set (default behavior), empty vector fields will be set to nullptr to
+  // make the flatbuffer more compact.
+  bool set_empty_vectors_to_null;
 
   IDLOptions()
-      : strict_json(false),
+      : gen_jvmstatic(false),
+        use_flexbuffers(false),
+        strict_json(false),
         skip_js_exports(false),
         use_goog_js_export_format(false),
         use_ES6_js_export_format(false),
@@ -587,7 +637,9 @@
         gen_compare(false),
         cpp_object_api_pointer_type("std::unique_ptr"),
         cpp_object_api_string_flexible_constructor(false),
+        cpp_direct_copy(true),
         gen_nullable(false),
+        java_checkerframework(false),
         gen_generated(false),
         object_suffix("T"),
         union_value_namespacing(true),
@@ -596,16 +648,22 @@
         keep_include_path(false),
         binary_schema_comments(false),
         binary_schema_builtins(false),
+        binary_schema_gen_embed(false),
         skip_flatbuffers_import(false),
         reexport_ts_modules(true),
         js_ts_short_names(false),
         protobuf_ascii_alike(false),
         size_prefixed(false),
         force_defaults(false),
+        java_primitive_has_method(false),
+        cs_gen_json_serializer(false),
+        filename_suffix("_generated"),
+        filename_extension(),
         lang(IDLOptions::kJava),
         mini_reflect(IDLOptions::kNone),
         lang_to_generate(0),
-        set_empty_to_null(true) {}
+        set_empty_strings_to_null(true),
+        set_empty_vectors_to_null(true) {}
 };
 
 // This encapsulates where the parser is in the current source file.
@@ -698,15 +756,14 @@
   explicit Parser(const IDLOptions &options = IDLOptions())
       : current_namespace_(nullptr),
         empty_namespace_(nullptr),
+        flex_builder_(256, flexbuffers::BUILDER_FLAG_SHARE_ALL),
         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);
-    }
+    if (opts.force_defaults) { builder_.ForceDefaults(true); }
     // Start out with the empty namespace being current.
     empty_namespace_ = new Namespace();
     namespaces_.push_back(empty_namespace_);
@@ -777,9 +834,9 @@
 
   // 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);
+  bool Deserialize(const reflection::Schema *schema);
 
-  Type* DeserializeType(const reflection::Type* type);
+  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.
@@ -796,6 +853,11 @@
 
   FLATBUFFERS_CHECKED_ERROR Error(const std::string &msg);
 
+  // @brief Verify that any of 'opts.lang_to_generate' supports Optional scalars
+  // in a schema.
+  // @param opts Options used to parce a schema and generate code.
+  static bool SupportsOptionalScalars(const flatbuffers::IDLOptions &opts);
+
  private:
   void Message(const std::string &msg);
   void Warning(const std::string &msg);
@@ -815,7 +877,7 @@
                                      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 ParseString(Value &val, bool use_string_pooling);
   FLATBUFFERS_CHECKED_ERROR ParseComma();
   FLATBUFFERS_CHECKED_ERROR ParseAnyValue(Value &val, FieldDef *field,
                                           size_t parent_fieldn,
@@ -836,16 +898,20 @@
   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 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 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);
+  FLATBUFFERS_CHECKED_ERROR ParseSingleValue(const std::string *name, Value &e,
+                                             bool check_now);
+  FLATBUFFERS_CHECKED_ERROR ParseFunction(const std::string *name, Value &e);
+  FLATBUFFERS_CHECKED_ERROR ParseEnumFromString(const Type &type,
+                                                std::string *result);
   StructDef *LookupCreateStruct(const std::string &name,
                                 bool create_if_new = true,
                                 bool definition = false);
@@ -853,8 +919,7 @@
   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,
+  FLATBUFFERS_CHECKED_ERROR StartEnum(const std::string &name, bool is_union,
                                       EnumDef **dest);
   FLATBUFFERS_CHECKED_ERROR ParseDecl();
   FLATBUFFERS_CHECKED_ERROR ParseService();
@@ -870,19 +935,19 @@
   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);
+                                      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,
+                                    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);
+                                       const char *suffix, BaseType baseType);
 
   bool SupportsAdvancedUnionFeatures() const;
   bool SupportsAdvancedArrayFeatures() const;
+  bool SupportsOptionalScalars() const;
   Namespace *UniqueNamespace(Namespace *ns);
 
   FLATBUFFERS_CHECKED_ERROR RecurseError();
@@ -896,9 +961,11 @@
   std::vector<Namespace *> namespaces_;
   Namespace *current_namespace_;
   Namespace *empty_namespace_;
-  std::string error_;         // User readable error_ if Parse() == false
+  std::string error_;  // User readable error_ if Parse() == false
 
   FlatBufferBuilder builder_;  // any data contained in the file
+  flexbuffers::Builder flex_builder_;
+  flexbuffers::Reference flex_root_;
   StructDef *root_struct_def_;
   std::string file_identifier_;
   std::string file_extension_;
@@ -927,6 +994,8 @@
 
 extern std::string MakeCamel(const std::string &in, bool first = true);
 
+extern std::string MakeScreamingCamel(const std::string &in);
+
 // 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,
@@ -935,159 +1004,160 @@
 // 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,
+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,
+extern bool GenerateText(const Parser &parser, const void *flatbuffer,
                          std::string *text);
-extern bool GenerateTextFile(const Parser &parser,
-                             const std::string &path,
+extern bool GenerateTextFile(const Parser &parser, const std::string &path,
                              const std::string &file_name);
 
+// Generate Json schema to string
+// See idl_gen_json_schema.cpp.
+extern bool GenerateJsonSchema(const Parser &parser, std::string *json);
+
 // 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,
+// See code_generators.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,
+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,
+// Generate C# files from the definitions in the Parser object.
+// See idl_gen_csharp.cpp.
+extern bool GenerateCSharp(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 Java files from the definitions in the Parser object.
+// See idl_gen_java.cpp.
+extern bool GenerateJava(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,
+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,
+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,
+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,
+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);
+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,
+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 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 Swift classes.
+// See idl_gen_swift.cpp
+extern bool GenerateSwift(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,
+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);
+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,
+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,
+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,
+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 generated Java or C# files.
+// See code_generators.cpp.
+extern std::string JavaCSharpMakeRule(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,
+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,
+// See code_generators.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,
+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,
+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,
+bool GenerateJavaGRPC(const Parser &parser, const std::string &path,
                       const std::string &file_name);
 
+// Generate GRPC Python interfaces.
+// See idl_gen_grpc.cpp.
+bool GeneratePythonGRPC(const Parser &parser, const std::string &path,
+                        const std::string &file_name);
+
+// Generate GRPC Swift interfaces.
+// See idl_gen_grpc.cpp.
+extern bool GenerateSwiftGRPC(const Parser &parser, const std::string &path,
+                              const std::string &file_name);
+
+extern bool GenerateTSGRPC(const Parser &parser, const std::string &path,
+                             const std::string &file_name);
 }  // namespace flatbuffers
 
 #endif  // FLATBUFFERS_IDL_H_