Files
2019-10-30 19:41:13 +03:00

82 lines
1.7 KiB
Go

// Copyright © 2018 Inanc Gumus
// Learn Go Programming Course
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
//
// For more tutorials : https://learngoprogramming.com
// In-person training : https://www.linkedin.com/in/inancgumus/
// Follow me on twitter: https://twitter.com/inancgumus
/*
✅ #1- Get and check the input
✅ #2- Create a byte buffer and use it as the output
✅ #3- Write input to the buffer as it is and print it
✅ #4- Detect the link
✅ #5- Mask the link
✅ #6- Stop masking when whitespace is detected
✅ #7- Put a http:// prefix in front of the masked link
*/
package main
import (
"fmt"
"os"
)
const (
link = "http://"
nlink = len(link)
mask = '*'
)
func main() {
args := os.Args[1:]
if len(args) != 1 {
fmt.Println("gimme somethin' to mask!")
return
}
var (
text = args[0]
size = len(text)
buf = make([]byte, 0, size)
in bool
)
for i := 0; i < size; i++ {
// slice the input and look for the link pattern
// do not slice it when it goes beyond the input text's capacity
if len(text[i:]) >= nlink && text[i:i+nlink] == link {
// set the flag: we're in a link! -> "http://....."
in = true
// add the "http://" manually
buf = append(buf, link...)
// jump to the next character after "http://"
i += nlink
}
// get the current byte from the input
c := text[i]
// disable the link detection flag
// this will prevent masking the rest of the bytes
switch c {
case ' ', '\t', '\n': // try -> unicode.IsSpace
in = false
}
// if we're in the link detection mode (inside the link bytes)
// then, mask the current character
if in {
c = mask
}
buf = append(buf, c)
}
// print out the buffer as text (string)
fmt.Println(string(buf))
}