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https://issues.apache.org/jira/browse/OFBIZ-10019?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jacques Le Roux updated OFBIZ-10019:
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Description:
I want to replace ?default(value) by !value in Freemarker templates, that's
1394 cases!
But before doing so I prefer to wait for a 2.4 Freemarker version because we
already experienced an issue at OFBIZ-4902, see
http://svn.apache.org/viewvc?view=revision&revision=r1624876
Actually I know now that it was not a bug of ours but [one of
Freemarker|https://freemarker.apache.org/docs/dgui_template_exp.html#dgui_template_exp_missing_default]:
bq. Warning! If you have a composite expression after the \!, like 1 + x,
always use parenthesses, like ${x!(1 + y)} or ${(x!1) + y)}, depending on which
interpretation you meant. That's needed because due to a programming mistake in
FreeMarker 2.3.x, the precedence of ! (when it's used as default value
operator) is very low at its right side. This means that, for example, ${x!1 +
y} is misinterpreted by FreeMarker as ${x!(1 + y)} while it should mean ${(x!1)
+ y}. This programming error will be fixed in FreeMarker 2.4, so you should not
utilize this wrong behavior, or else your templates will break with FreeMarker
2.4!
was:
I want to teplace ?default(value) by !value in Freemarker templates, that's
1394 cases!
But before doing so I prefer to wait for a 2.4 Freemarker version because we
already experienced an issue at OFBIZ-4902, see
http://svn.apache.org/viewvc?view=revision&revision=r1624876
Actually I know now that it was not a bug of ours but [one of
Freemarker|https://freemarker.apache.org/docs/dgui_template_exp.html#dgui_template_exp_missing_default]:
bq. Warning! If you have a composite expression after the \!, like 1 + x,
always use parenthesses, like ${x!(1 + y)} or ${(x!1) + y)}, depending on which
interpretation you meant. That's needed because due to a programming mistake in
FreeMarker 2.3.x, the precedence of ! (when it's used as default value
operator) is very low at its right side. This means that, for example, ${x!1 +
y} is misinterpreted by FreeMarker as ${x!(1 + y)} while it should mean ${(x!1)
+ y}. This programming error will be fixed in FreeMarker 2.4, so you should not
utilize this wrong behavior, or else your templates will break with FreeMarker
2.4!
> Replace ?default(value) by !value in Freemarker templates
> ---------------------------------------------------------
>
> Key: OFBIZ-10019
> URL: https://issues.apache.org/jira/browse/OFBIZ-10019
> Project: OFBiz
> Issue Type: Improvement
> Components: ALL COMPONENTS
> Affects Versions: Trunk
> Reporter: Jacques Le Roux
> Assignee: Jacques Le Roux
> Priority: Trivial
> Fix For: Upcoming Release
>
>
> I want to replace ?default(value) by !value in Freemarker templates, that's
> 1394 cases!
> But before doing so I prefer to wait for a 2.4 Freemarker version because we
> already experienced an issue at OFBIZ-4902, see
> http://svn.apache.org/viewvc?view=revision&revision=r1624876
> Actually I know now that it was not a bug of ours but [one of
> Freemarker|https://freemarker.apache.org/docs/dgui_template_exp.html#dgui_template_exp_missing_default]:
> bq. Warning! If you have a composite expression after the \!, like 1 + x,
> always use parenthesses, like ${x!(1 + y)} or ${(x!1) + y)}, depending on
> which interpretation you meant. That's needed because due to a programming
> mistake in FreeMarker 2.3.x, the precedence of ! (when it's used as default
> value operator) is very low at its right side. This means that, for example,
> ${x!1 + y} is misinterpreted by FreeMarker as ${x!(1 + y)} while it should
> mean ${(x!1) + y}. This programming error will be fixed in FreeMarker 2.4, so
> you should not utilize this wrong behavior, or else your templates will break
> with FreeMarker 2.4!
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