scan.go

func scan(str string)[]string {
    var head []string
    var tail string

    if str == "" {
        return []string{}
    }else{
        x := string(str[0])
        switch x {
        case "'":
            head, tail = splitQuote(str)
        case " ":
            head, tail = skipSpace(str)
        default:
            head, tail = splitSpace(str)
        }
        return append(head, scan(tail)...)
    }
}

func skipSpace(str string)([]string, string) {
    return []string {}, str[1:len(str)]
}

func splitSpace(str string)([]string, string) {
    head := ""
    tail := ""
    for i := 0; i < len(str); i++ {
        x := string(str[i])
        if x == " " {
            tail = str[(i+1):len(str)]
            break
        } else {
            head += x
        }
    }
    return []string{head}, tail
}

func splitQuote(str string)([]string, string) {
    head := ""
    tail := ""
    for i := 1; i < len(str); i++ {
        x := string(str[i])
        if x == "'" {
            tail = str[(i+2):len(str)]
            break
        } else {
            head += x
        }
    }
    return []string{head}, tail
}