Jamis Buck
5/10/2005 7:10:00 PM
On May 10, 2005, at 2:17 AM, Farrel Lifson wrote:
> Hi Rubyists,
>
> While writing a template with ERB I found that case statements do not
> seem to work:
>
> irb(main):001:0> template =<<EOS
> irb(main):002:0" <% case number %>
> irb(main):003:0" <% when 1 %>
> irb(main):004:0" <%= "one" %>
> irb(main):005:0" <% when 2 %>
> irb(main):006:0" <%= "two" %>
> irb(main):007:0" <% else %>
> irb(main):008:0" <% "more than two" %>
> irb(main):009:0" <% end %>
> irb(main):010:0" EOS
> => "<% case number %>\n<% when 1 %>\n<%= \"one\" %>\n<% when 2 %>\n<%=
> \"two\" %
>> \n<% else %>\n<% \"more than two\" %>\n<% end %>\n"
> irb(main):011:0> require 'erb'
> => true
> irb(main):012:0> erbRunner = ERB.new(template)
> => #<ERB:0x2c497f8 @filename=nil, @src="_erbout = ''; case number ;
> _erbout.con
> cat \"\\n\"\n when 1 ; _erbout.concat \"\\n\"\n_erbout.concat((
> \"one\" ).to_s);
> _erbout.concat \"\\n\"\n when 2 ; _erbout.concat
> \"\\n\"\n_erbout.concat(( \"tw
> o\" ).to_s); _erbout.concat \"\\n\"\n else ; _erbout.concat \"\\n\"\n
> \"more th
> an two\" ; _erbout.concat \"\\n\"\n end ; _erbout.concat
> \"\\n\"\n_erbout", @saf
> e_level=nil>
The problem is the way ERB compiles the strings. It basically tries to
do the following with your snippet:
case number
_erbout.concat "\n"
when 1
_erbout.concat "\n"
and so forth, which is not valid Ruby syntax. Try the following instead:
<% case number
when 1 %>
one
<% when 2 %>
two
<% else %>
something else
<% end %>
- Jamis