Method expectOneOf

expr/parse.go:237–243

expectOneOf consumes the next token and guarantees it has one of the required types.

(expected1, expected2 lex.TokenType, context string)

// expectOneOf consumes the next token and guarantees it has one of the required types.
func (t *tree) expectOneOf(expected1, expected2 lex.TokenType, context string) lex.Token {
	token := t.Cur()
	if token.T != expected1 && token.T != expected2 {
		t.unexpected(token, context)
	}
	return token
}

// unexpected complains about the token and terminates processing.
func (t *tree) unexpected(token lex.Token, msg string) {