取消缩进多行字符串值

问题描述：

I don't like the Go convention for multiline strings:

function main() {
  for {
    if something {
      text := `   Lorem ipsum dolor sit amet, consectetur adipiscing elit,
sed do eiusmod tempor incididunt ut labore et dolore magna 
aliqua. 
   Ut enim ad minim veniam, quis nostrud exercitation 
ullamco laboris nisi ut aliquip ex ea commodo consequat.
      `
    }
  }
}

I prefer:

function main() {
  for {
    if something {
      text := `
           Lorem ipsum dolor sit amet, consectetur adipiscing elit,
        sed do eiusmod tempor incididunt ut labore et dolore magna
        aliqua. 
           Ut enim ad minim veniam, quis nostrud exercitation 
        ullamco laboris nisi ut aliquip ex ea commodo consequat.
      `
      // text = unindent(text, 8) ?
    }
  }
}

Efficiency isn't a concern.

How do I remove a fixed number of spaces from the start of each line in my string value?

我不喜欢多行字符串的Go约定： p>

 函数main（）{
 {
为{
 text：=`Lorem ipsum dolor set amet，consectetur adipiscing elit，
sed eiusmod tempor incididunt ut labore et dolore magna 
aliqua。  
尽量不使用veniam，不要进行任何锻炼
ullamco labis is ali aliquip ex commodo。
`
} 
} 
} 
  code>  pre> 
 
 我更喜欢： p> 
 
 
 函数main（）{
表示{
，如果某事{
文本：=`
 Lorem ipsum dolor atmet，保密的建议，  
 sed do eiusmod tempor indicidunt ut labour et dolore magna 
 aliqua。  
尽量不使用veniam，不需任何锻炼
完全接受comlamo劳动后就可以接受劳动。
`
 // text = unindent（text，8）？
} 
} 
} 
   code>  pre> 
 
 效率不是问题。 p> 
 
 
如何从我每一行的开头删除固定数量的空格 字符串值？ p> 
  div>

答

That's a simple strings.Replace() call:

text = strings.Replace(text, "
        ", "
", -1)

Output before and after the replace (try it on the Go Playground):

           Lorem ipsum dolor sit amet, consectetur adipiscing elit,
        sed do eiusmod tempor incididunt ut labore et dolore magna
        aliqua. 
           Ut enim ad minim veniam, quis nostrud exercitation 
        ullamco laboris nisi ut aliquip ex ea commodo consequat.


   Lorem ipsum dolor sit amet, consectetur adipiscing elit,
sed do eiusmod tempor incididunt ut labore et dolore magna
aliqua. 
   Ut enim ad minim veniam, quis nostrud exercitation 
ullamco laboris nisi ut aliquip ex ea commodo consequat.

Note that this will still leave newline character at the beginning and at the end of your text. If you also want to get rid of them, you may use strings.Trim():

text = strings.Replace(text, "
        ", "
", -1)
text = strings.Trim(text, "
")

Note: strings.TrimSpace() would come first to mind, but it's not a good choice as that would also remove the indentation from the first line (" Lorem") which is unwanted. We really just want to get rid of extra prefix and postfix newlines.

To verify the difference:

text = strings.Replace(text, "
        ", "
", -1)
fmt.Printf("%q
", text)
text = strings.Trim(text, "
")
fmt.Printf("%q
", text)

Output:

" Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. " " Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat."

To wrap it in a helper function:

func unindent(s string, spaces int) string {
    old := "
" + strings.Repeat(" ", spaces)
    s = strings.Replace(s, old, "
", -1)
    return strings.Trim(s, "
")
}

And using it:

text = unindent(text, 8)

An alternative way to create the old replaceable string:

func unindent(s string, spaces int) string {
    old := fmt.Sprintf("%*c", -spaces-1, '
')
    s = strings.Replace(s, old, "
", -1)
    return strings.Trim(s, "
")
}

答

You can try this not a good but easy method.

func main() {
    text := "Lorem ipsum dolor sit amet, consectetur adipiscing elit,
" +
            "sed do eiusmod tempor incididunt ut labore et dolore magna
" +
            "aliqua.
" +
            "Ut enim ad minim veniam, quis nostrud exercitation
" +
            "ullamco laboris nisi ut aliquip ex ea commodo consequat."
    fmt.Println(text)


}

取消缩进多行字符串值

相关推荐