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Flatbuffers Python Object API (#5616)

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* Flatbuffers Python Object API

Implement the logic to generate the Python object API that can
unpack the data from a buf class into an object class, and pack
the data of an object class to a buf class.

* Fix the build issues

Remove unused parameters and replace auto in the for-loop statement
with std::string to make it compatible with VS2010.

* Fix the build issues.

* Add support for Array type

Added logic to handle Array type in Python Object API. Updated the
generated code accordingly.

* Fix the old style casting from int to char

* Fixed another conversion from int to char

* Fixed the import for typing

Importing typing may cause errors when a machine do not have the
moduel typing installed. This PR fixes the issue by guarding
"import typing" with the "try/except" statement.

* Fix issue of iterating the vector of import list

* Update the generated examples using generate_code.sh

* Fix the import order for typing

The import list was stored in unordered_set, so that each generated
codes may have different import order. Therefore, it failed in the
consistency test where two generated copies need to have exactly the
same apperance.

* Optimize unpack using numpy

Use numpy to unpack vector whenever it is possible to improve unpack
performance.

Also, added codegen command for Python specificly in generate_code.sh,
because --no-includes cannot be turn on for Python.

* Fix the import order

* Update generate_code.bat for windows accordingly

* Replace error message with pass

Avoid printing error message for every Python2 users about typing.
Replace it with pass.
This commit is contained in:
lu-wang-g
2019-12-02 14:11:28 -08:00
committed by Wouter van Oortmerssen
parent 75823cc275
commit 65f8703572
29 changed files with 2846 additions and 86 deletions
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6
tests/generate_code.sh
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@@ -15,7 +15,8 @@
# limitations under the License.
set -e
../flatc --cpp --java --kotlin --csharp --dart --go --binary --lobster --lua --python --js --ts --php --rust --grpc --gen-mutable --reflect-names --gen-object-api --gen-compare --no-includes --cpp-ptr-type flatbuffers::unique_ptr --no-fb-import -I include_test monster_test.fbs monsterdata_test.json
../flatc --cpp --java --kotlin --csharp --dart --go --binary --lobster --lua --js --ts --php --rust --grpc --gen-mutable --reflect-names --gen-object-api --gen-compare --no-includes --cpp-ptr-type flatbuffers::unique_ptr --no-fb-import -I include_test monster_test.fbs monsterdata_test.json
../flatc --python --gen-mutable --reflect-names --gen-object-api --gen-compare --cpp-ptr-type flatbuffers::unique_ptr --no-fb-import -I include_test monster_test.fbs monsterdata_test.json
../flatc --cpp --java --kotlin --csharp --dart --go --binary --lobster --lua --python --js --ts --php --rust --gen-mutable --reflect-names --no-fb-import --cpp-ptr-type flatbuffers::unique_ptr -o namespace_test namespace_test/namespace_test1.fbs namespace_test/namespace_test2.fbs
../flatc --cpp --java --kotlin --csharp --js --ts --php --gen-mutable --reflect-names --gen-object-api --gen-compare --cpp-ptr-type flatbuffers::unique_ptr -o union_vector ./union_vector/union_vector.fbs
../flatc --cpp --scoped-enums -o evolution_test ./evolution_test/evolution_v*.fbs
@@ -23,7 +24,8 @@ set -e
../flatc -b --schema --bfbs-comments --bfbs-builtins -I include_test arrays_test.fbs
../flatc --jsonschema --schema -I include_test monster_test.fbs
../flatc --cpp --java --kotlin --csharp --python --gen-mutable --reflect-names --gen-object-api --gen-compare --no-includes --cpp-ptr-type flatbuffers::unique_ptr monster_extra.fbs monsterdata_extra.json
../flatc --cpp --java --csharp --python --gen-mutable --reflect-names --gen-object-api --gen-compare --no-includes --scoped-enums --jsonschema --cpp-ptr-type flatbuffers::unique_ptr arrays_test.fbs
../flatc --cpp --java --csharp --gen-mutable --reflect-names --gen-object-api --gen-compare --no-includes --scoped-enums --jsonschema --cpp-ptr-type flatbuffers::unique_ptr arrays_test.fbs
../flatc --python --gen-mutable --reflect-names --gen-object-api --gen-compare --scoped-enums --jsonschema --cpp-ptr-type flatbuffers::unique_ptr arrays_test.fbs
cd ../samples
../flatc --cpp --lobster --gen-mutable --reflect-names --gen-object-api --gen-compare --cpp-ptr-type flatbuffers::unique_ptr monster.fbs
../flatc -b --schema --bfbs-comments --bfbs-builtins monster.fbs