Counting lines of a file in Scala - scala

Question

I am studying Scala nowadays and this is my code snippet to count the number of lines in a text file.
//returns line number of a file
def getLineNumber(fileName: String): Integer = {
val src = io.Source.fromFile(fileName)
try {
src.getLines.size
} catch {
case error: FileNotFoundException => -1
case error: Exception => -1
}
finally {
src.close()
}
}
I am using Source.fromFile method as explained in Programming in Scala book. Here is the problem: If my text file is like this:
baris
ayse
deneme
I get the correct result 6. If I press enter after word deneme I still get number 6, however I exptect 7 in this case. If I press space after pressing enter I get 7 which is correct again. Is this a bug in Scala standard library or more possibly am I missing something?
Finally, my basic main method here If it helps:
def main(args: Array[String]): Unit = {
println(getLineNumber("C:\\Users\\baris\\Desktop\\bar.txt"))
}

Answer 1

It uses java.io.BufferedReader to readLine. Here is the source of that method:
/**
* Reads a line of text. A line is considered to be terminated by any one
* of a line feed ('\n'), a carriage return ('\r'), or a carriage return
* followed immediately by a linefeed.
*
* #return A String containing the contents of the line, not including
* any line-termination characters, or null if the end of the
* stream has been reached
*
* #exception IOException If an I/O error occurs
*
* #see java.nio.file.Files#readAllLines
*/
public String readLine() throws IOException {
return readLine(false);
}
Which calls this:
...
* #param ignoreLF If true, the next '\n' will be skipped
...
String readLine(boolean ignoreLF) ...
...
/* Skip a leftover '\n', if necessary */
if (omitLF && (cb[nextChar] == '\n'))
nextChar++;
skipLF = false;
omitLF = false;
So basically that's how it's implemented. I guess it depends what a line means to you. Are you counting lines that contain something or new line characters? - different things obviously.

Answer 2

If you press enter after word deneme simply you add an end-of-line sequence (CR+LF, in your case) to the 6th line. You see the cursor goes to new line, but you did not create a new line: You simply specify that the sixth line is over. To create a new line you have to put a character after the end-of-line sequence, as you make when you press space.