macOS NSString & lines.

[netytan]

Hi again guys,

I'm looking for a way to either iterate over each line in an NSString or to to count the number of lines in an NSString so that I can iterate over them . If anyone could point me in the right direction it would be much appreciated!

Also, is there a way to strip unwanted characters from the start/end of a line: like chomp in perl or strip() in Python.

Thanks in advance,

Mark.

 

[robbieduncan]

Take a look at the NSString documentation on XCode. The - (NSArray *)componentsSeparatedByStringNSString *)separator looks promising (@"\n" would be the separator)

- (NSString *)stringByTrimmingCharactersInSetNSCharacterSet *)set can be used like chomp.

 

[netytan]

Thanks Robbie, the stringByTrimmingCharactersInSet: method was just what I was looking for .

I'm not so sure about the line separation because the approach doesn't seem unicode compatible (I could be wrong).

[i]From the docs on [b]"getLineStart:end:contentsEnd:forRange:"[/b][/i]
A line is delimited by any of these characters, the longest possible sequence being preferred to any shorter:

U+000D (\r or CR)

U+2028 (Unicode line separator)

U+000A (\n or LF)

U+2029 (Unicode paragraph separator)

\r\n, in that order (also known as CRLF)

Maybe someone could answer this: in a unicode string, is the line terminator still "\n" or some other character? The string I'm working with is from an NSTextView if that helps.

Thanks again ,

Mark.

 

[robbieduncan]

Seems to be a fair point. Create some sort of recursive method to loop over separating by each possible line end character in turn?

 

[northen]

I wrote a C library to do something like that, available at

http://savannah.nongnu.org/projects/velocity/

It's a bit stubby right now, but it will eventually have a VCount method. I haven't worked on it for a bit, though