What is the method for determining the line number of a specific string within a byte array?

Looking for:

  • The location of a function definition within a code file.

What I have:

  • The code file.
  • The byte index where the function definition begins and its length in bytes.

How can I determine the line number of this function in the file?

My plan:

  • Read the code file as a byte array.
  • Locate the function in the byte array using the start index and length.
  • Convert the binary function to text.
  • Convert the entire code file from binary to text.
  • Number the lines within the text.
  • Use pattern matching to identify the function's line number in the text.

I am utilizing Golang for the back-end service, which I believe will handle this task. However, I also have a front-end in JavaScript that I can utilize if necessary.

javascriptarraysgofile-iobinaryfiles

Answer №1

If you have the file content p stored as []byte and an integer byte index i representing the function, utilizing 

bytes.Count(p[:i], []byte{'\n'}) + 1
will give you the line number corresponding to the function.

Answer №2

Is simply counting the number of newline characters sufficient for your needs, or are you interested in a more nuanced approach?

You can begin counting instances of newlines \n until you reach the specified byte index. The line number corresponds to the total count of newline characters encountered.

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