ast

type Alternative []Expression

type Epsilon struct {
	Epsilon string    // epsilon keyword
	Start   token.Pos // position of e or ε
}

type Expression interface {
	Node
	// contains filtered or unexported methods
}

type Grammar []*Production

type Name struct {
	Name     string    // name of the production
	StartPos token.Pos // position of the first character
}

type Node interface {
	// Pos returns the position of the first character of the expression.
	Pos() token.Pos
	// contains filtered or unexported methods
}

type Production struct {
	Name *Name      // name of the production (lhs)
	Expr Expression // expression of the production (rhs)
}

type Sequence []Expression

type Terminal struct {
	Terminal string    // terminal literal
	QuotePos token.Pos // position of "
}

type Visitor func(Node) bool