Re: macro errors

Wednesday, July 25, 2012, 5:42:51 PM, Sam Steingold wrote:

[snip]
> yes. result is a JavaBean in my case, and getTitle() is defined.
>
> are you suggesting that "." denotes both hash table and field access?

If the left-hand-operand is a java.util.Map, then it calls
Map.get(rho), otherwise it reads a JavaBean property or reads a public
Java field. Usually. To be exact, what "." does entirely depends on
the object_wrapper setting, and the type of the object. Like, if you
are using the default object wrapper, for a W3C DOM node it will issue
an XPath query.

> i.e., I could have written scmr.results.model instead of
> scmr.results[model], right?

scmr.results["model"] is the same as scmr.results.model. But
scmr.results[model] is something different (dynamic key).

>> There's also an old implementation bug (that's kept for
>> backward-compatibility), where, if you pass an undefined expression to
>> a macro as a parameter (like even something that's indeed a typo), and
>> the macro defines a default value for the parameter, that default
>> value will kick in. So if you prefer, you can just do this:
>>   <#macro sentiment scmr! model><#if scmr?is_sequence>
>> and then you don't need the `!` when calling the macro.
>
> I got
> Encountered "!" at line 2, column 23 in
> com/addthis/sentiment/sentidemo.ftl.

Eh... sorry. I meant:

  <#macro sentiment scmr=false model><#if scmr?is_boolean>

> Was expecting one of:
>     "=" ...
>     "..." ...
>     "," ...
>     ")" ...
>     <ID> ...
>     ">" ...
>
> column 23 is "!" in scmr!
>
>
> okay,  here is what seems to be working for me:
>
> <#macro sentiment scmr model><#if scmr != ''>
>   <#assign senti = scmr.results[model]>
>     <#if senti??>
>       <td>${senti.sentimentType}</td>
>       <td>${senti.score?html}</td>
>     <#else><td align="center" colspan="2">none</td>
>     </#if>
> </#if></#macro>
>
>
>       <@sentiment model=model scmr=result.title! />
>       <@sentiment model=model scmr=result.body! />
>       <@sentiment model=model scmr=result.mean! />
>
> the big question:
> will the "<#if senti??>" test in the macro work as intended?

That line alone would, but <#assign senti = scmr.results[model]> will
fail if it evaluates to a null. In general, wherever you can get a
null during normal operation, you have to specify a default with "!".

> what is the value of "senti" anyway? a string? the java bean object?

I can't know, since I don't know your data-model. Looking at the macro
I guess it's a JavaBean.

> thanks!
>

-- 
Best regards,
 Daniel Dekany


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