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Re: Ruby 1.8.7: ERB is broken

Charlie Marx

1/3/2009 6:32:00 PM

Actually comments will work in 1.8.7, but only with a specific, more
limited syntax than shown in the original example above.

Here is a relevant portion from the inline documentation for ERB:

| ERB recognizes certain tags in the provided template and converts them based on the rules below:
|
| <% Ruby code -- inline with output %>
| <%= Ruby expression -- replace with result %>
| <%# comment -- ignored -- useful in testing %>
| % a line of Ruby code -- treated as <% line %> (optional -- see ERB.new)
| %% replaced with % if first thing on a line and % processing is used
| <%% or %%> -- replace with <% or %> respectively

So comments ARE allowed when the whole embedded expression is a comment,
i.e.:

<%# this is good comment %>

<% n=1 # this is a bad comment %>

If your 'bad comments' are consistent in their usage of whitespace
around the hash mark, then it ought to be easy to do a grep
search-and-replace to change all your bad comments to look like this,
which WILL work in Ruby 1.8.7:

<% n=1 %><%# this is the fixed comment %>

--
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1 Answer

Jordan Brough

1/28/2009 1:31:00 PM

0

Comments aren't supported, only comment tags are.

ruby -v -rerb -e 'p ERB.new("<%# test %>foobar").result'

correctly gives 'foobar'. while

ruby -v -rerb -e 'p ERB.new("<% # test %>foobar").result'

gives an empty string (in 1.8.6 and 1.8.7).

Charlie Marx wrote:
> Actually comments will work in 1.8.7, but only with a specific, more
> limited syntax than shown in the original example above.

>
> So comments ARE allowed when the whole embedded expression is a comment,
>
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