Auto-Commenting macro

Tired of documenting C++ functions? Me too. Just scroll, select, copy,
scroll, paste, delete parts, type text…

This little VB Script macro does half of the work for you. I don’t
have much to explain so — here’s the sample:

Initial state of C++ code:

BOOL CMainFrame::OnCmdMsg(UINT nID, int nCode, void* pExtra,
						  AFX_CMDHANDLERINFO* pHandlerInfo)
{
	// let the view have first crack at the command
	if (m_wndView.OnCmdMsg(nID, nCode, pExtra, pHandlerInfo))
		return TRUE;
	// otherwise, do default handling
	return CFrameWnd::OnCmdMsg(nID, nCode, pExtra, pHandlerInfo);
}

And this is C++ code after starting CommentFunction() macro:

// ==================================================================
//
// FUNCTION :  CMainFrame::OnCmdMsg()
//
// * Description :
//
//
// * Author : [Nenad Nikolic], Created : [10/31/98 7:11:41 PM]
//
// * Returns : [BOOL] –
//
// * Function parameters :
// [nID] –
// [nCode] –
// [pExtra] –
// [pHandlerInfo] –
//
// ==================================================================
BOOL CMainFrame::OnCmdMsg(UINT nID, int nCode, void* pExtra,
						  AFX_CMDHANDLERINFO* pHandlerInfo)
{
	TRACE0( ” CMainFrame::OnCmdMsg() enteredn” );
	// let the view have first crack at the command
	if (m_wndView.OnCmdMsg(nID, nCode, pExtra, pHandlerInfo))
		return TRUE;
	// otherwise, do default handling
	return CFrameWnd::OnCmdMsg(nID, nCode, pExtra, pHandlerInfo);
}

Inserted comment above the function is the result of CommentFunction() macro action. You need to select line(s) with function decleration and start the macro. In this case, select these two lines:

BOOL CMainFrame::OnCmdMsg(UINT nID, int nCode, void* pExtra,
						  AFX_CMDHANDLERINFO* pHandlerInfo)

As you can see, macro extracts pieces of function decleration and generates function comment with stuff that usually need to be commented. As a “bonus” you get “TRACE0” in first line of function body, for debugging purposes.

You can change authors name in code — simply replace rvalue of “author =” statement.

For information how to edit and start a macro, look at Visual Studio documentation.

Can be improved — suggestions are welcome.

‘ CODE (copy in your macro file)
‘——————————————————————————
Sub PrintText( s, newline )
 ActiveDocument.Selection = s
 if newline then
  ActiveDocument.Selection.NewLine
 end if
end sub
Function ParseParam( s )
 Trim( s )
 retpos = InStrRev( s, ” ” )
 ParseParam = Right( s, len( s ) – retpos )
end function
‘ this is main function
Sub CommentFunction()
 Dim win
 set win = ActiveWindow
 if win.type <> “Text” Then
  MsgBox “This macro can only be run when a text editor window is active.”
 else
  fun = ActiveDocument.Selection.Text
  if len(fun) = 0 then
   exit sub
 end if
 retpos = InStr( 1, fun, ” “, vbTextCompare )
 retval = Left( fun, retpos – 1)
 lppos = InStr( 1, fun, “(“, vbTextCompare )
 funcname = Mid( fun , retpos, lppos – retpos )
 ActiveDocument.Selection.StartOfLine
 ActiveDocument.Selection.LineUp
 ActiveDocument.Selection.NewLine
 PrintText “// ==================================================================”, TRUE
 PrintText “// “, TRUE
 PrintText “// FUNCTION : ” & funcname & “()”, TRUE
 PrintText “// “, TRUE
 PrintText “// * Description :”, TRUE
 PrintText “// “, TRUE
 PrintText “// “, TRUE
 author = “Nenad Nikolic”
 PrintText “// * Author : [” & author & “], Created : [” & CDate(Now) & “]”, TRUE
 PrintText “// “, TRUE
 PrintText “// * Returns : ” + “[” + retval + “] -“, TRUE
 PrintText “// “, TRUE
 PrintText “// * Function parameters : “, TRUE
 fun = Right( fun, Len(fun) – lppos )
 pos = 1
 have_more = true
 do while pos > 0 and have_more
  pos = InStr( 1, fun, “,”, vbTextCompare )
  if pos = 0 then
   have_more = false
   pos = InStr( 1, fun, “)”, vbTextCompare )
  end if
  if pos > 1 then
   retval = Left( fun, pos – 1 )
   retval = ParseParam( retval )
   PrintText “// [” + retval + “] -“, TRUE
  end if
  if have_more = true then
   fun = Right( fun, Len(fun) – pos )
  end if
 loop
 PrintText “// “, TRUE
 PrintText “// ==================================================================”, FALSE
 ‘ remove this part if you don’t want TRACE0
 ActiveDocument.Selection.FindText “{”
 ActiveDocument.Selection.CharRight
 ActiveDocument.Selection.NewLine
 PrintText “TRACE0( “”” & funcname & “() enteredn”” );”, TRUE
 End If
end Sub

Date Last Updated: February 3, 1999