ast

type BasicLit struct {
	ValuePos token.Pos   // literal position
	Kind     token.Token // token.STRING or token.CHAR
	Value    string
}

type BinaryExpr struct {
	X     Expr        // left operand
	OpPos token.Pos   // operator position
	Op    token.Token // operator: token.REM (list operator)
	Y     Expr        // right operand
}

type Choice struct {
	Options []Expr // multiple options
}

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

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

type File struct {
	Decls     []Decl
	FileStart token.Pos
}

type Ident struct {
	NamePos token.Pos // identifier position
	Name    string    // identifier name
}

type Node interface {
	Pos() token.Pos
	End() token.Pos
}

type Rule struct {
	Name   *Ident
	TokPos token.Pos // position of '='
	Expr   Expr
}

type Sequence struct {
	Items []Expr // multiple items
}

type UnaryExpr struct {
	OpPos token.Pos   // operator position
	Op    token.Token // operator: token.MUL, token.ADD or token.QUESTION
	X     Expr        // operand
}