Ruby Forum Ruby > rexml dtd parser

I seem to have some personal confusion with how to correctly utilize the
rexml/dtd library.  I am using ruby version 1.8.6 and when I orginally 
tried
to use the code I received some unknown method errors.  I modified the 
code
in the case statement contained in dtd.rb from the notation
when ElementDecl.PATTERN_RE

to when ElementDecl::PATTERN_RE

I no longer received these errors.   However, I am now receiving the
following error.

uninitialized constant REXML::DTD::EntityDecl::PATTERN_RE

When I look at the code in entitydecl.rb I see the following line;

   md = source.match( PATTERN_RE, true )

However PATTERN_RE is not declared or intialized in the entitydecl.rb 
file.
Am I implementing the library wrong or is this code still bugged?

Any help is much appreciated.


Below is a snapshot of how I am trying to use this library.


#!/usr/bin/ruby -dw

require "rexml/dtd/dtd"
require "pathname"



dtdarg = ARGV[0]

def dtdparse(dtdfile)
        path = Pathname::new(dtdfile)
        if path.relative? then
                dtdfile = File::expand_path(dtdfile)
        end
        dtddata = REXML::DTD::Parser::parse(dtdfile)
        puts dtddata
end


dtdparse(dtdarg)

I have had the same problems using the dtd parsing section of rexml. I 
got past all the errors only to find that it's not really parsing all 
parts of the dtd. The parse_helper isn't even written quite correctly as 
a parser -- it ends up catching only the ElementDeclarations, then 
possibly a few things after the last ElementDeclaration. Anyway, it 
looks like it's not a fully-written feature of rexml yet. I decided 
since I need it I'll have to write my own ruby DTD-parser. I might be 
putting it on github as a gem (check back at http://github.com/dcparker 
later).

By the way, does ANYBODY out there know of a real dtd parser in ruby? I 
need one that will parse a dtd and actually understand the lists of 
attributes and child elements and such. (If none show up, watch for 
mine, I probably won't post it to this list, but it'll be on github.)

~Daniel

Nathan Taylor wrote:
> I seem to have some personal confusion with how to correctly utilize the
> rexml/dtd library.  I am using ruby version 1.8.6 and when I orginally 
> tried
> to use the code I received some unknown method errors.  I modified the 
> code
> in the case statement contained in dtd.rb from the notation
> when ElementDecl.PATTERN_RE
> 
> to when ElementDecl::PATTERN_RE
> 
> I no longer received these errors.   However, I am now receiving the
> following error.
> 
> uninitialized constant REXML::DTD::EntityDecl::PATTERN_RE
> 
> When I look at the code in entitydecl.rb I see the following line;
> 
>    md = source.match( PATTERN_RE, true )
> 
> However PATTERN_RE is not declared or intialized in the entitydecl.rb 
> file.
> Am I implementing the library wrong or is this code still bugged?
> 
> Any help is much appreciated.
> 
> 
> Below is a snapshot of how I am trying to use this library.
> 
> 
> #!/usr/bin/ruby -dw
> 
> require "rexml/dtd/dtd"
> require "pathname"
> 
> 
> 
> dtdarg = ARGV[0]
> 
> def dtdparse(dtdfile)
>         path = Pathname::new(dtdfile)
>         if path.relative? then
>                 dtdfile = File::expand_path(dtdfile)
>         end
>         dtddata = REXML::DTD::Parser::parse(dtdfile)
>         puts dtddata
> end
> 
> 
> dtdparse(dtdarg)