Call functions and support for break

[Burak Emre Kabakcı]

I need to generate the following output with Mustache:

  least("event0_count")
  least("event0_count", "event1_count")

I just have the list ("event1", "event2") in my scope, the size of the list is dynamic and I need to be able to generate this string using Mustache in order to be able to use it in our project. I'm kinda stuck here.

There are two different ways that I found and none of them worked.

1. Use inner loops and the and let the inner loop call the function `IntStream.range(0, sizeOfList)` but function calls are not allowed in Mustache.

2. Use inner loops and break in inside of the inner loop but the `break` feature is not supported in Mustache.java

Is there any workaround for this output or do you have any other suggestion?

[Sam Pullara]

You need to use a view class on top of your collection. There is one included in Mustache called DecoratedCollection that includes things like first/last/etc. Here is a link to a test that renders things like I think you want:

https://github.com/spullara/mustache.java/blob/master/compiler/src/test/java/com/github/mustachejava/util/DecoratedCollectionTest.java

See the "testArrayOutput" test for I think your exact use case.

Sam

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[Burak Emre Kabakcı]

Hey Sam,

Thanks for the response, I’m aware of DecoratedCollection but not sure how it can solve this problem. I’m able to use first, last and index variables and since I have an inner loop, the loop in inside overrides the values of index, first and last. Let’s consider this example:

{{#steps}} 

least({{#steps}} event{{index}}_count{{^last}},{{/last}} {{/steps}}){{^last}},{{/last}} 

{{/steps}}

The output is the following:

least( event0_count,  event1_count,  event2_count ),

least( event0_count,  event1_count,  event2_count ),

least( event0_count,  event1_count,  event2_count )

However I need to generate the following:

least( event0_count),

least( event0_count,  event1_count ),

least( event0_count,  event1_count,  event2_count )

It may be possible to render if I can access the parent scope and check if the child index is less than the parent index like this one:

{{#steps}} 

least({{#steps}} {{#parent.index < child.index}} event{{index}}_count{{^last}},{{/last}} {{/parent.index < child.index}} {{/steps}}){{^last}},{{/last}} 

{{/steps}}

However this template is not valid so I’m not able to do it.

Best,

Emre

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[Sam Pullara]

Ah, I didn't catch that it was a nested loop. For this you will have to have a view class that returns a truncated list since there is no way to break out of it. Mustache was designed around generating things like HTML that don't need this kind of behavior. I've added a test case that shows how to get the output you are looking for.

https://github.com/spullara/mustache.java/commit/1917fe3ecaffa7817efb34d1c62af494c4958637

Sam