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Add --root-type option to flatc [C++, parser, JSON] (#4728)

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* Add --root-type option to flatc

To select or override a root_type

* Add help text from flatc --root-type to Compiler.md doc
This commit is contained in:
Paul Reimer
2018-05-07 16:07:52 -07:00
committed by Wouter van Oortmerssen
parent d215852f52
commit 6621424308
4 changed files with 20 additions and 3 deletions
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11
src/flatc.cpp
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@@ -120,6 +120,7 @@ std::string FlatCompiler::GetUsageString(const char *program_name) const {
" --no-ts-reexport Don't re-export imported dependencies for TypeScript.\n"
" --reflect-types Add minimal type reflection to code generation.\n"
" --reflect-names Add minimal type/name reflection.\n"
" --root-type T Select or override the default root_type\n"
"FILEs may be schemas (must end in .fbs), or JSON files (conforming to preceding\n"
"schema). FILEs after the -- must be binary flatbuffer format files.\n"
"Output files are named using the base file name of the input,\n"
@@ -268,6 +269,9 @@ int FlatCompiler::Compile(int argc, const char **argv) {
opts.mini_reflect = IDLOptions::kTypes;
} else if (arg == "--reflect-names") {
opts.mini_reflect = IDLOptions::kTypesAndNames;
} else if (arg == "--root-type") {
if (++argi >= argc) Error("missing type following" + arg, true);
opts.root_type = argv[argi];
} else {
for (size_t i = 0; i < params_.num_generators; ++i) {
if (arg == params_.generators[i].generator_opt_long ||
@@ -407,6 +411,13 @@ int FlatCompiler::Compile(int argc, const char **argv) {
}
}
if (!opts.root_type.empty()) {
if (!parser->SetRootType(opts.root_type.c_str()))
Error("unknown root type: " + opts.root_type);
else if (parser->root_struct_def_->fixed)
Error("root type must be a table");
}
if (opts.proto_mode) GenerateFBS(*parser.get(), output_path, filebase);
// We do not want to generate code for the definitions in this file