Red FlatBuffers

Red FlatBuffers is a pure Ruby FlatBuffers implementation.

Red FlatBuffers can generate Ruby code that reads and writes (not implemented yet) FlatBuffers from .fbfs (binary FlatBuffers schema). Red FlatBuffers can't compile .fbs (FlatBuffers schema) to .fbfs. You need to use FlatBuffers to compile .fbs to .bfbs.

gem install red-flatbuffers

Generate .bfbs from .fbs by flatc that is provided by https://github.com/google/flatbuffers/ :

flatc \
  --binary \
  --schema \
  --bfbs-builtins \
  --bfbs-comments \
  YOUR_SCHEMA.fbs

The order of arguments is important. You must specify --bfbs-builtins and --bfbs-comments AFTER --binary. If you specify them BEFORE --binary, they are ignored.

Generate Ruby code from .bfbs:

rbflatc YOUR_SCHEMA.bfbs

It generates Ruby code in the current directory. You can change it by --output-dir:

rbflatc --output-dir lib YOUR_SCHEMA.bfbs

If you want to wrap generate code by namespaces, you can use --outer-namespaces:

rbflatc \
  --output-dir lib/my/namespace \
  --outer-namespaces My::Namespace \
  YOUR_SCHEMA.bfbs

If you want to read FlatBuffers data in a file, you can use File.open and IO::Buffer.map:

require "my/schema"

File.open("data.fbs", "rb") do |input|
  buffer = IO::Buffer.map(input, nil, 0, IO::Buffer::READONLY)
  schema = My::Schema.new(buffer)
  # Use schema
end

If you have FlatBuffers data as String, you can just pass it to your generated Ruby code:

require "my/schema"

schema = My::Schema.new(data)
# Use schema

This is not implemented yet.

• Sutou Kouhei <kou@clear-code.com>

Apache License 2.0. See doc/text/apache-2.0.txt for details.