Re: multiline comments

[Quentin Spencer]

John W. Eaton wrote:

>  * Do these comments nest?  Do you get this behavior:
>
>      %{ 1
>      %{ 2
>      %} matches 2
>      %} matches 1
>
>   or
>
>      %{ 1
>      %{ 2
>      %} matches 1
>      %} error, warning, or just ignored (it is a valid comment)
>  
OK, I did some tests to see how it all behaves. The first thing I 
discovered is that
%{ text here
is not a valid block comment;  the characters "%{" must appear on a line 
by themselves (white space before or after is OK). It also appears that 
the comments do nest. I tested the following code with no errors:

%{   
 block-commented text
 %{
   nested block-commented text
 %}
 is this still block-commented?
%}

Deleting the final %} gives the error:
"Unterminated %{ block. Use %} to terminate."

> ...
> Yes, if(0) endif is the more common way of faking block comments.  The
> disadvantage is that the text inside the if(0) endif block must be
> valid code.  In a block comment, you could have anything except "%}"
> at the beginning of a line.
>  
Yes, I've noticed that as well.



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