编写sed命令：搜索指定变量并注释其对应大括号代码块

Got it, let's tackle this problem. You need a sed command that can find a specific property (by variable name) and comment out the entire block—even if the getter/setter has nested curly braces, like your conditional logic examples. Here's a robust solution that handles nested structures correctly:

The Sed Command #

To comment out var2_name, use this:

sed -E '/public.*var2_name[[:space:]]*\{/{
    :block_loop
    s/^/\/\/ /
    /\{/{
        # Count opening/closing braces to handle nested logic
        h
        s/[^\{]*//g
        s/\}/\{/g
        x
        s/[^\}]*//g
        G
        s/\n//
        # If braces aren't balanced, read next line and repeat
        /^[{}]*$/!{
            N
            b block_loop
        }
    }
}' your_file.cs

How It Works #

1. Target the Property: The initial pattern /public.*var2_name[[:space:]]*\{/ matches the start of the property definition for var2_name, accounting for optional spaces before the opening brace.
2. Loop Through the Block: We enter the block_loop label to process each line in the property block:
   • Comment the Line: s/^/\/\/ / prepends // to the start of the current line.
   • Balance Braces: To handle nested braces (like in your getter's conditional logic), we count the number of { and }. If they don't match, we read the next line (N) and loop again until the braces are balanced—meaning we've reached the end of the property block.

Customize for Other Variables #

Just replace var2_name with var3_name (or any other variable name) to target a different property. For example, to comment var3_name:

sed -E '/public.*var3_name[[:space:]]*\{/{
    :block_loop
    s/^/\/\/ /
    /\{/{
        h
        s/[^\{]*//g
        s/\}/\{/g
        x
        s/[^\}]*//g
        G
        s/\n//
        /^[{}]*$/!{
            N
            b block_loop
        }
    }
}' your_file.cs

Modify the File In-Place #

If you want to edit the original file directly (instead of just printing output):

• For GNU sed (Linux): Add the -i flag:

  sed -i -E '/public.*var2_name[[:space:]]*\{/{ ... }' your_file.cs
  

• For BSD sed (macOS): Use -i '' to avoid creating a backup file:

  sed -i '' -E '/public.*var2_name[[:space:]]*\{/{ ... }' your_file.cs
  

Example Output #

Running the command on your sample input would produce:

public return_type var_name {get; set;}
// public return_type var2_name { get { if (some_condition) {some_code} else {some_code}} set; }
// public return_type var3_name { get { if (some_condition) { some_code } else { some_code } } }

If your var3_name was split across multiple lines originally, the command would comment each line individually, matching your desired output format perfectly.

内容的提问来源于stack exchange，提问作者Gulshan Vaish