Go language modifies / removes multiple line breaks in strings

Up like water , Great simplicity .

Catalog

The problem background

solve

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The problem background

For example, some strings are so long ：

xxxxxxx

yyyyyy:  xxxxx


yyyyyy:  xxxxx



yyyyyy:  xxxxx

There are multiple line breaks between each line , And what we want most of the time is this ：

xxxxxxx
yyyyyy:  xxxxx
yyyyyy:  xxxxx
yyyyyy:  xxxxx

That is to say, it is OK to keep a newline between the contents ！

This is based on common functions and \n It may be impossible to judge , I met them and analyzed them , Write an algorithm to share with you , I hope we can solve similar problems as soon as possible .

solve

If the common string function cannot be used to judge the newline , You can't use string To operate the , First to []rune have a look , For example, the four newlines in my string are as follows ：

10 32 10 32 10 32 10 32

among 10 It's line breaking ,32 Is a space , And keep the first newline 、 The left end of each line of content needs to be aligned after removing redundant line breaks , So the algorithm is as follows ：

func TrimWrap(src string) (dist string) {
   if len(src) == 0 {
      return
   }

   r, distR := []rune(src), []rune{}
   var m, k, n int32
   for i := 0; i < len(r); i++ {
      if i == 1 && len(r) == 2{
         if r[i] == 10 && r[i-1] == 10 {
            continue
         }
      }

      if i >= 2 {
         m, k, n = r[i-2], r[i-1], r[i]
      }

      if m == 10 && n == 10 && k == 32 {
         continue
      }

      if m == 32 && n == 32 && k == 10 {
         continue
      }

      distR = append(distR, r[i])
   }

   dist = string(distR)
   return
}

If your need is only for multiple line breaks without worrying about the impact of spaces , Just change the logic a little . If you don't need to keep line breaks at all, it's easier .

If it helps you , Welcome to leave your footprints ！