ParserBuilder
Builds a parser definition lazily by passing the recursive parsers of the host language.
This indirection is needed when supplying parser implementations as many parsers recursively parse child elements. A list parser for example needs to be able to detect any other block or span element within a list item. But since it has no way of knowing which extensions a user might have added to the host language, those parsers are supplied from the outside by the parser engine.
class Object
trait Matchable
class Any
trait BlockParserBuilder
class BlockParserBuilderOps
trait SpanParserBuilder
class SpanParserBuilderOps