Defines all supported standard text roles of the reStructuredText reference parser.

The following text roles are fully supported:

• emphasis
• strong
• literal
• subscript (and sub alias)
• superscript (and sup alias)
• title-reference (and title alias) - the default role
• raw (+ format option) (needs to be enabled explicitly through ReStructuredText.withRawElements)

The following text role is supported with some limitation:

• code does currently not support syntax highlighting (it allows to set the language so client-side highlighters can be integrated if required)

The following text roles are not supported:

• math
• pep-reference
• rfc-reference

In contrast to the reference parser the default-role directive cannot be supported in Laika as the parser is not stateful. Therefore it is not possible to change the default role half-way through a parsing process. However the default role can be specified through the API when creating a parser instance:

object RstExtensions extends RstExtensionRegistry {
  val blockDirectives = Nil
  val spanDirectives = Nil
  val textRoles = Nil
  override val defaultTextRole = "my-role-name"
}

val transformer = Transformer.from(ReStructuredText).to(HTML).using(RstExtensions)

See http://docutils.sourceforge.net/docs/ref/rst/roles.html for details.