From: Daniel Berger <djberg96@...>
Date: 2007-03-08T02:16:28+09:00
Subject: Re: Trimming whitespace from ERB

On Sep 27 2005, 7:55 am, "Phrogz" <g...@refinery.com> wrote:
> Summary:
> a) Is there a way to ask ERB to trim leading whitespace between the
> start-of-line and a '<%'? (The equivalent of .gsub( /^\s+<%/, '<%' ) If
> not, I suggest that one should exist.

I second this.

> b) What is up with the crazy syntax for the third param to ERB? Could
> we perhaps come up with a cleaner, less-ambiguous way to specify
> various parsing options? Hash options? One char per flag?

And this one, too.

Anyone got a patch?

> Details:
> See the templates below. I want to output a certain text string
> indented by a specific number of tabs, with a single line break at the
> end. ERB does not seem to have a setting to ignore leading whitespace
> for an opening <% tag. This means that I have to either manage the
> whitespace manually (using _erbout) or play with where I put the <% and
> %> tags (making the code surprisingly hard to read).
>
> require 'erb'
>
> desired_but_unusable_template = <<ENDTEMPLATE
> Hello
> <%
>         4.times{
>                 %>
>                 BLING
>                 <%
>         }
> %>
> World
> ENDTEMPLATE
>
> ERB.new( desired_but_unusable_template ).run
> #=> Hello
> #=>
> #=>          BLING
> #=>
> #=>          BLING
> #=>
> #=>          BLING
> #=>
> #=>          BLING
> #=>
> #=> World
>
> ERB.new( desired_but_unusable_template, nil, '%>' ).run
> #=> Hello
> #=>          BLING
> #=>                          BLING
> #=>                          BLING
> #=>                          BLING
> #=>          World
>
> gross_but_correct_template_1 = <<ENDTEMPLATE
> Hello
> <%
>         4.times{
>                 %>
>                 BLING
> <%
>         }
> %>
> World
> ENDTEMPLATE
>
> ERB.new( gross_but_correct_template_1, nil, '%>' ).run
> #=> Hello
> #=>          BLING
> #=>          BLING
> #=>          BLING
> #=>          BLING
> #=> World
>
> gross_but_correct_template_2 = <<ENDTEMPLATE
> Hello<%
>         4.times{
>                 %>
>                 BLING<%
>         }
> %>
> World
> ENDTEMPLATE
>
> ERB.new( gross_but_correct_template_2 ).run
> #=> Hello
> #=>          BLING
> #=>          BLING
> #=>          BLING
> #=>          BLING
> #=> World
>
> gross_but_correct_template_3 = <<ENDTEMPLATE
> Hello
> <%
>         4.times{
>                 _erbout << "\t\t"
>                 %>BLING<%
>                 _erbout << "\n"
>         }
> %>
> World
> ENDTEMPLATE
>
> ERB.new( gross_but_correct_template_3, nil, '%>' ).run
> #=> Hello
> #=>          BLING
> #=>          BLING
> #=>          BLING
> #=>          BLING
> #=> World

Regards,

Dan