syntax

type Highlight struct {
	// At is the addressed string.
	At [2]int64
	// Style is the style to apply to the string.
	text.Style
}

type Regexp struct {
	// Regexp is the re1 regular expression to match the element.
	Regexp string
	// Group is the numbered capture group of the element text.
	Group int
	Style text.Style
}

type Tokenizer interface {
	// NextToken next token or false.
	NextToken(rope.Rope) (Highlight, bool)
}