Mastering Go - Second Edition

The go/scanner package

A scanner is something, which in this case will be some Go code, that reads a program written in a programming language, which in this case is Go, and generates tokens.

The go/scanner package is used for reading Go programs and generating a series of tokens. The use of the go/scanner package will be illustrated in goScanner.go, which will be presented in three parts.

The first part of goScanner.go is as follows:

package main 
 
import ( 
    "fmt" 
    "go/scanner" 
    "go/token" 
    "io/ioutil" 
    "os" 
) 
 
func main() { 
    if len(os.Args) == 1 { 
        fmt.Println("Not enough arguments!") 
        return 
 
    } 

The go/token package defines constants that represent the lexical tokens of the Go programming language.

The second part of goScanner.go contains the following ...