From: "Ara.T.Howard" <ahoward@...>
Date: 2003-12-20T09:51:55+09:00
Subject: Re: Amrita question(s)

On Sat, 20 Dec 2003, Michael Campbell wrote:

<snip>
> Perhaps my example is overloaded too much on terms; let me rephrase.
> 
> I want the following to display IFF my model contains the data element
> "element".
> 
> Field Label: element
> 
> Now, I can do this like so: 
> 
> code: {:element => "Field Label: element" } html: <span id=element><span>
> 
> or something like
> 
> code: {:elementlabel => "Field Label: ", :element => "element" } html: <span
> id=elementlabel></span> <span id=element></span>
> 
> but neither is very satisfying.  I don't like either solution as they put my
> markup directly into the code (and my model data), and in the second case,
> requires that I manipulate 2 values for every labelled output.
> 
> What I'd *LIKE* somehow is to have 
> 
> html: <sometag id=element>Field Label:</sometag> <span id=element></span>
> 
> and some version of code that omits the "Field Label:" part if :element
> doesn't exist; I understand the actual value referenced by the :element key
> already won't show.  In other words, "sometag" is just a conditional "is it
> there or not?" test, where "span" tests for existence AND displays it.
</snip>

amrita can accept a proc as it's model data, with it you can do pretty much
whatever you want:

~/eg/ruby > cat c.rb
  require 'amrita/template'
  include Amrita
  
  t = TemplateText.new <<-html
    <span id=element>Label : </span>
  html
  
# here's one way
  data = { :element => lambda{|e| e.body + 'foobar'} }
  t.expand STDOUT, data
  
# you could simply automate this too
  def append txt; lambda{|e| e.body + txt}; end
  data = {:element => append('foobar')}
  t.expand STDOUT, data
  
# and of course it doesn't show up at all if no key is given
  data = {:element => nil}
  t.expand STDOUT, data

~/eg/ruby > ruby c.rb
  Label : foobar
  Label : foobar

~/eg/ruby > # note blank line above for last case 


other ways i can think of include things like

  def label_maker key, txt
    {key => {:label=>true,:txt=>txt}}
  end

and then something like:

  t = TemplateText.new <<-html
    <span id=element><span id=label>Label : </span><span id=txt></span></span>
  html

  data = {
    :element => label_maker(:element, 'foobar'),
  }

<snip>
> As for your comment about blocking out big chunks of HTML, how do you do
> that?  If you have sections separated by <div id=commentoutthischunk> ...
> </div>, how do you make the Amrita parser not replace the HTML code with the
> value of the :commentoutthischunk value?  YOu can't use
> {:commentoutthischunk => nil}, but any other non-nil value you use will not
> only eliminate your HTML, but be printed in its place.  (Or do you use a
> space or something innocuous?)
</snip>


i just meant nil or not.  my usage is something like:

t = TemplateText.new <<-html
  <span id=main_page>
    ...
  </span>
  <span id=page_0>
    ...
  </span>
  <span id=page_1>
    ...
  </span>
html


and i simply do

  
  page # => :main_page, :page_0, :page_1

  data = Hash[page => {}][page] # begin in a sub hash for this page

then proceed normally

-a
-- 

ATTN: please update your address books with address below!

===============================================================================
| EMAIL   :: Ara [dot] T [dot] Howard [at] noaa [dot] gov
| PHONE   :: 303.497.6469
| ADDRESS :: E/GC2 325 Broadway, Boulder, CO 80305-3328
| STP     :: http://www.ngdc.noaa.gov/stp/
| NGDC    :: http://www.ngdc.noaa.gov/
| NESDIS  :: http://www.nesdis.noaa.gov/
| NOAA    :: http://www.noaa.gov/
| US DOC  :: http://www.commerce.gov/
|
| The difference between art and science is that science is what we
| understand well enough to explain to a computer.  
| Art is everything else.  
|   -- Donald Knuth, "Discover"
|
| /bin/sh -c 'for l in ruby perl;do $l -e "print \"\x3a\x2d\x29\x0a\"";done' 
===============================================================================