It's impossible to escape ${something == 3} if something is not in the context
(in general, why can't $ ALWAYS be escaped?)
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Key: VELOCITY-454
URL: http://issues.apache.org/jira/browse/VELOCITY-454
Project: Velocity
Issue Type: Bug
Affects Versions: 1.4
Reporter: Bjoern Guenzel
Priority: Critical
Attachments: testVelocity.vm
I want to use Velocity to generate a template for UJAC, which uses a very
similiar templating language to Velocity. Therefore escaping is a primary
concern.
I am surprised that there seems to be no way to just escape "$" and "#" in
general.
Suppose we have the line \$name
If name is in the context, this will evaluate to $name, otherwise it will
evaluate to \$name
The real problem starts if there is something to escaped like
${something == 3} (this is something that might occur in a UJAC template)
This gives an error in both cases: ${something == 3} and \${something == 3}
both give an error ("} expected" or something like that).
My guess is that Velocity get's confused when trying to evaluate "something ==
3" to see if it is something that is known and should be escaped or something
that is unknown and should not be escaped.
In my opinion the proper behaviour for escaping characters would be to ALWAYS
escape, independent of the context.
Even if the current way of escaping would work in all cases, there would be a
major problem with it. I can't give the velocity template to the Designer,
because only the developer knows all the variables that exist in the context.
So the designer is unable to properly escape all the variables. I think it
would be important to have a way to simply escape everything.
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