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https://issues.apache.org/jira/browse/VELOCITY-876?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Terefang Verigorn updated VELOCITY-876:
---------------------------------------
Description:
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 or
jsr223 )
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.
brain storming:
how about supporting non-outputting el/jsr223 between #{{ ... #}} tags, like:
------
#{{ /* jexl code */
var = [ 1,2,3,4,5,6,7 ];
#}}
#foreach( $n in $var )
$n
#end
------
was:
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 or
jsr223 )
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.
brain storming:
how about supporting non-outputting el/jsr223 between #{{ ... #}} tags.
> 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 or
> jsr223 )
> 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.
> brain storming:
> how about supporting non-outputting el/jsr223 between #{{ ... #}} tags, like:
> ------
> #{{ /* jexl code */
> var = [ 1,2,3,4,5,6,7 ];
> #}}
> #foreach( $n in $var )
> $n
> #end
> ------
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