Re: eruby delimiters

Hi,

Christian Luginbuehl wrote:
> i've been working with mod_ruby and eruby for quite some time now and i am really impressed by it's ease of use. however i had a problem when parsing XML-files with embedded eruby code. at least libxml for ruby does not like the original delimiters. i found out, that in the file eruby_lib.c there are constants for beginning and ending delimiters to be set. but they would only work when they are 2 characters long. so i hacked the code a bit and made it work for beginning delimiters with variable length.
> 
> i'm not quite sure if this is the right place to post a patch, but i still paste it here and wait for some reaction.

I rejected same proposals before, but I changed my opinion. Because many
people proposed it.

But I think the default behaviour should not be changed.
So `<?ruby' will be enabled by an option of configure.rb or a command
line option.

   $ ./configure.rb --enable-xml

or

   $ eruby --xml bar.txt

(The name `xml' may not be appropriate.)

> - i did not quite understand the part that does transform <%% to <% (and
>   simply removed it). why should this be done? is the % at the beginning
>   of a line of any use (this oen i didn't touch)?

`<%%' is used to escape `<%'.
This enables you to describe the syntax of eRuby in eRuby files.

input for eruby:
-----------------------
eruby converts
   <%% print "hello world" %>
to
   <% print "hello world" %>
-----------------------

output of eruby:
-----------------------
eruby converts
   <% print "hello world" %>
to
   hello world
-----------------------

How do you think about the escape sequence for `<?ruby'?

Then, % at BOL is used to avoid extra newlines.

input for eruby:
-----------------------
<ul>
<% for i in ["foo", "bar", "baz"] %>
   <li><%= i %>
<% end %>
</ul>
-----------------------

output of eruby:
-----------------------
<ul>

   <li>foo

   <li>bar

   <li>baz

</ul>
-----------------------

You can eliminate these extra newlines by % at BOL.

input for eruby:
-----------------------
<ul>
% for i in ["foo", "bar", "baz"]
   <li><%= i %>
% end
</ul>
-----------------------

output of eruby:
-----------------------
<ul>
   <li>foo
   <li>bar
   <li>baz
</ul>
-----------------------

Shugo