A list of functions/methods from source code?

Hello all,

I have a SyntaxEditor working very nicely in my application, but I'd like to be able to interrogate it for all function/method definitions. However, I think I'm going about it in the wrong way. Here is basically what I'm doing:

 internal List<String> functionList()
        {

            ITextSnapshotReader reader = _codeEditor.Document.CurrentSnapshot.GetReader(0); 



            List<String> items = new List<String>();

            while (reader.GoToNextToken()) {
               IToken tok = reader.ReadToken();
                if (tok != null) {
                    if (tok.Key != null) {
                       if (tok.Key.Equals("Identifier"))
                       {
                           ActiproSoftware.Text.TextRange range = tok.TextRange;
                           String alltext = _codeEditor.Document.CurrentSnapshot.GetText(LineTerminator.Newline);

                           
                           String funcitem = alltext.Substring(range.StartOffset, range.AbsoluteLength);
          

                           items.Add(funcitem);

                       }
                    }
                }
             

            }

            return items;

        }

And what I end up with for this simple bit of C:

#include <stdio.h>



int func1(void)
{
  return 0;
}

int func2(void)
{
  return 0;
}


int func3(void)
{
  return 0;
}


int func4(void)
{
  return 0;
}

Is:

func1

func2

func4

So, it's missing func3, and I don't know why. The same thing happens for PHP or Python code, I just seem to be missing one or two function definitions. Using the key 'Identifier' will also give me function calls and variable names, but I can probably work around that. My real problem is that some function definitions are missing.

Am I going about this in really the wrong way? Must I use Antlr instead? I don't need a full-blown lexing of the source code, just function/method definitions, which my above code gets me 95% of the way there, I'm just mysteriously missing definitions for some reason.

Thanks

Garry