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[Python/JS/TS] Codegen SizeOf method for structs (#6136)

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* [Python] Codegen SizeOf classmethod for structs

This codegens a `SizeOf()` classmethod for all structs since we can't
determine the size of a FlatBuffer generated struct from Python otherwise.

* [JS/TS] Codegen sizeOf static method for structs

This codegens a `sizeOf()` static method for all structs since we can't
determine the size of a FlatBuffer generated struct from JavaScript or
TypeScript otherwise.
This commit is contained in:
Anass Al
2020-09-28 08:54:50 -07:00
committed by GitHub
parent 641309a5bf
commit 689bfafa7e
14 changed files with 133 additions and 0 deletions
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13
src/idl_gen_python.cpp
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@@ -621,6 +621,16 @@ class PythonGenerator : public BaseGenerator {
}
}
// Generate struct sizeof.
void GenStructSizeOf(const StructDef &struct_def, std::string *code_ptr) {
auto &code = *code_ptr;
code += Indent + "@classmethod\n";
code += Indent + "def SizeOf(cls):\n";
code +=
Indent + Indent + "return " + NumToString(struct_def.bytesize) + "\n";
code += "\n";
}
// Generate table constructors, conditioned on its members' types.
void GenTableBuilders(const StructDef &struct_def, std::string *code_ptr) {
GetStartOfTable(struct_def, code_ptr);
@@ -678,6 +688,9 @@ class PythonGenerator : public BaseGenerator {
// Generate a special function to test file_identifier
GenHasFileIdentifier(struct_def, code_ptr);
}
} else {
// Generates the SizeOf method for all structs.
GenStructSizeOf(struct_def, code_ptr);
}
// Generates the Init method that sets the field in a pre-existing
// accessor object. This is to allow object reuse.