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https://issues.apache.org/jira/browse/WICKET-2727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12831126#action_12831126
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Igor Vaynberg commented on WICKET-2727:
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we are not using velocity syntax. the ${varname} convention existed before
velocity was around. we also do not support all the features that
velocity/freemarker/etc/etc provide, we only support the variable substitution.
we cannot change our escape sequence anymore then velocity can change theirs,
people have a lot of existing code written against the current one.
of course you can always write your own interpolator that uses velocity...
> Interpolator replace $$ by $ - breaks javascript templates using prototype
> css selector
> ---------------------------------------------------------------------------------------
>
> Key: WICKET-2727
> URL: https://issues.apache.org/jira/browse/WICKET-2727
> Project: Wicket
> Issue Type: Bug
> Affects Versions: 1.4.5
> Reporter: Bruno Bieth
> Assignee: Igor Vaynberg
>
> If I'm using the prototype css selector in a javascript template file, the
> interpolator convert double $ into a single $. This gives weird runtime
> errors as single $ is also a prototype selector (with a different semantic).
> I don't see why $$ should be replaced by the variable interpolator ?
> In VariableInterpolator (line 111) :
> {code}
> while ((start = lowerPositive(string.indexOf("$$", pos),
> string.indexOf("${", pos))) != -1)
> {
> // Append text before possible variable
> buffer.append(string.substring(pos, start));
> if (string.charAt(start + 1) == '$')
> {
> buffer.append("$");
> pos = start + 2;
> continue;
> }
> {code}
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