5 minutes of fun: JRuby and StringTemplate

Wed, 04 Nov 2009 18:01:07 GMT

If you like to explore some stuff on templating, and I highly recommend StringTemplate, this is how you can do it from JRuby.

jrst.rb

# A simple JRuby StringTemplate integration demo 
# Notes: 
# - save this script as 'jrst.rb'.
# - in the folder from where you're executing this simple script, you'll
#  have a subfolder: 'lib', containing the StringTemplate libraries:
#    lib/antlr-2.7.7.jar
#    lib/stringtemplate-3.2.1.jar
# run the script
# $ jruby jrst.rb World
#
# You'll see: Hello World!
# ----------- 
require 'java'   

Dir["lib/*.jar"].each { |jar| require jar }

class JRubySringTemplate
  include_class 'java.io.StringWriter'   
  include_class 'org.antlr.stringtemplate.StringTemplate'    

  def render ( arg)                         
    st = StringTemplate.new("Hello $name$!")
    st.set_attributes( {'name' => arg});
    writer = StringWriter.new   
    writer.write( st.toString)
    return writer.getBuffer
  end 
end

puts JRubySringTemplate.new().render( ARGV[0])

My 5 minutes of fun in a lunch break. Next time I'll show you how to use Velocity in the same way :)

Have fun!

StringTemplate Renderer for JPublish, a Component this time ;)

Sat, 01 Sep 2007 20:28:44 GMT

Hi there,

For those of you maintaining JPublish sites developed with Velocity or FreeMarker, using the newly added StringTemplate renderer is not an easy option, especially if those sites are in production. So what can you do if you want to use ST?

Don't worry, you can render StringTemplate syntax in Velocity/FreeMarker driven pages by using the StringTemplate component that I just added to the JPublish component family.

Using it is very simple.

Build the ST Component from SVN and load it in jpublish.xml:

<component-manager>
    <components>
        <component id="JPST" classname="ca.flop.jpublish.components.JPSTComponent">
            <stringtemplate-groups>
                <group name="default" relative-root-dir="/st_content" refresh-interval="15"
                       lexer="org.antlr.stringtemplate.language.DefaultTemplateLexer"/>
                <group name="menus" relative-root-dir="/st_menus"/>
            </stringtemplate-groups>
        </component>
    </components>
</component-manager>

and then use the ST component wherever ST is required, for example in a Velocity page:
$components.JPST.renderPath("menus:main_menu"), the contents of the main_menu.st file will be immediately rendered in-line.

I will add more details in the JPublish Wiki, meanwhile you can find the code and a demo web application in our SVN.

Have fun!
-florin

Spikes Of Nothingness - template tag

5 minutes of fun: JRuby and StringTemplate

jrst.rb

StringTemplate Renderer for JPublish, a Component this time ;)