Terefang Verigorn created VELOCITY-876:
------------------------------------------
Summary: Support a Configurable EL within ${{...}} also $!{{...}}
tags
Key: VELOCITY-876
URL: https://issues.apache.org/jira/browse/VELOCITY-876
Project: Velocity
Issue Type: Improvement
Components: Engine
Affects Versions: 1.7
Reporter: Terefang Verigorn
Priority: Minor
Fix For: 2.x
Since Velocity2 is a Major version, why not start to support some new features?
As of Velocity 1.x you can use ${name} to refer to object "name" in the
context, or use $!{name} if you want "" for null values.
How about using ${{ el-expression }} to evaluate and output the given
"el-expression" in a configured el-engine with the current velocity context,
same should hold for $!{{ el-expression }}.
Some possible engines would be :
commons-el, commons-jexl, ognl, mvel
if using el/jexl ${{name}} would be mostly the same as ${name}.
* usage cases
- the simple ${{...}} would allow more complicated expressions than present in
the plain engine, especially if we look at the jexl2/3 features
- #if( ${{ }} ) -- would improve the boolean issue because the el could be used
to wrap in "a?x:y"
* architecture
thru api abstraction, almost any el could be plugged in ( even groovy.eval )
core engine could ship with the api and el or jexl as the reference impl, other
bindings would be optional jars with thier own deps.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscr...@velocity.apache.org
For additional commands, e-mail: dev-h...@velocity.apache.org
