class Asciidoctor::Extensions::Registry

def find_block_macro_extension name

cooresponding BlockMacroProcessor or nil if a match is not found.
Returns the [Extension] object stored in the registry that proxies the

name - the String or Symbol (coersed to a Symbol) macro name

to handle a block macro with the specified name.
Public: Retrieves the {Extension} proxy object for the BlockMacroProcessor registered 
def find_block_macro_extension name
  @block_macro_extensions[name.to_sym]
end