class Asciidoctor::Extensions::Registry

instance of this Preprocessor.
Returns the [Extension] stored in the registry that proxies the

end
end
...
process do |doc, reader|
preprocessor do
# as a method block

preprocessor 'FrontMatterPreprocessor'
# as a name of a Preprocessor subclass

preprocessor FrontMatterPreprocessor.new
# as an instance of a Preprocessor subclass

preprocessor FrontMatterPreprocessor
# as a Preprocessor subclass

Examples

first argument to this method.
Unless the Preprocessor is passed as the method block, it must be the

* A method block (i.e., Proc) that conforms to the Preprocessor contract
* The String name of a Preprocessor subclass
* An instance of a Preprocessor subclass
* A Preprocessor subclass

The Preprocessor may be one of four types:

the AsciiDoc source before parsing begins.
Public: Registers a {Preprocessor} with the extension registry to process

def preprocessor *args, &block
  add_document_processor :preprocessor, args, &block
end