Scanner defines a lexical scanner
type Scanner struct {
// Error is called for each error encountered. If no Error
// function is set, the error is reported to os.Stderr.
Error func(pos token.Pos, msg string)
// ErrorCount is incremented by one for each error encountered.
ErrorCount int
// contains filtered or unexported fields
}
func New(src []byte) *Scanner
New creates and initializes a new instance of Scanner using src as its source content.
func (s *Scanner) Scan() token.Token
Scan scans the next token and returns the token.