module StructTrans

# File lib/struct_trans/hash.rb, line 11
def construct_hash
  {}
end

# File lib/struct_trans/ostruct.rb, line 11
def construct_ostruct
  OpenStruct.new
end

# File lib/struct_trans/hash.rb, line 7
def trans_hash struct, schema
  transform(:hash, struct, schema)
end

# File lib/struct_trans/ostruct.rb, line 7
def trans_ostruct struct, schema
  transform(:ostruct, struct, schema)
end

# File lib/struct_trans.rb, line 7
def transform kind, struct, schema
  case schema
  when Symbol
    struct.public_send(schema)
  when Array
    schema.map do |key|
      transform(kind, struct, key)
    end
  when Hash
    schema.inject(public_send("construct_#{kind}")) do |box, (key, value)|
      public_send("write_#{kind}",
        box, key, transform(kind, struct.public_send(key), value))
      box
    end
  else
    raise TypeError.new("Unknown type: #{schema.class}: #{schema}")
  end
end

# File lib/struct_trans/hash.rb, line 15
def write_hash hash, key, value
  hash[key] = value
end

# File lib/struct_trans/ostruct.rb, line 15
def write_ostruct ostruct, key, value
  ostruct.public_send("#{key}=", value)
end