CodePage -> DocBlock / CodeBlock

DocBlock -> DirectiveBlock / MarkdownBlock

Code Block -> !DOC_START RemainingLine

DirectiveBlock -> DOC_START DIRECTIVE_START (LongDirective / LineDirective)

MarkdownBlock -> MarkdownLine+

LongDirective ->
    (AUTHOR_DIR / DOC_DIR / EXAMPLE_DIR) RemainingLine MarkdownBlock?

LineDirective -> ORG_DIR RemainingLine

MarkdownLine -> DOC_START !DIRECTIVE_START RemainingLine

RemainingLine -> (!EOL)+, EOL

Tokens
------

DOC_START           -> "%% "
EOL                 -> "\n"
DIRECTIVE_START     -> "@"