package token

// All tokens in the pseudo-lambda language.
type Type int

const (
	// Denotes the '(' token.
	OpenParen Type = iota
	// Denotes the ')' token.
	CloseParen
	// Denotes an alpha-numeric variable.
	Atom
	// Denotes the '/' token.
	Slash
	// Denotes the '.' token.
	Dot
)

// A representation of a token in source code.
type Token struct {
	// Where the token begins in the source text.
	Index int
	// What type the token is.
	Type Type
	// The value of the token.
	Value string
}

func NewOpenParen(index int) *Token {
	return &Token{Type: OpenParen, Index: index, Value: "("}
}

func NewCloseParen(index int) *Token {
	return &Token{Type: CloseParen, Index: index, Value: ")"}
}

func NewDot(index int) *Token {
	return &Token{Type: Dot, Index: index, Value: "."}
}

func NewSlash(index int) *Token {
	return &Token{Type: Slash, Index: index, Value: "\\"}
}

func NewAtom(name string, index int) *Token {
	return &Token{Type: Atom, Index: index, Value: name}
}