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Added function to disable template rendering abort on error #109

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@kabukky
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@kabukky kabukky commented Mar 4, 2019

We are currently evaluating Jet for our projects.

One thing that is different from a lot of other template languages (e. g. Handlebars) is how Jet handles expressions that cannot be evaluated.

E. g. accessing a non-valid field value will lead to the whole template rendering process being aborted and the error being returned. Handlebars would just insert an empty string into the place of the expression.

To enable this "Handlebars"-like behavior with Jet, I've added the abortTemplateOnError global variable that can be set from the outside via SetAbortTemplateOnError.

It works well with this template (document.yada is not set in this case, the if comparison is also not valid):

{{ document.title }}
{{ document.yada }}
{{ if "2006" < 2018 }}foooooooo{{end}}
{{ document.title }}

Do you see any problems with this? Node.errorf is used in a lot of other situations that I haven't checked yet

Hagelstein, Kai and others added 14 commits Mar 14, 2019
Hagelstein, Kai
make Ranger return interface{}, not reflect.Value
fix isset call with chain node argument
Alexander Willing
support interface{} values in len()
isset: return false when value is nil
isset: only check for nil on values that can be nil
Alexander Willing
make notNil a top-level function
Kabukky
When recovering from a panic, the runtime (state) was put back into the state pool.
The state was then re-used by the next template execution.
This led to the pre-crash-context (e. g. variables set on the state via Runtime.Set) being leaked into the next template execution.
@jhsx
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@jhsx jhsx commented Jul 28, 2019

Hi, @kabukky thanks for the contribution, can you send multiple pull requests ?
Walking through the pull request i see many modifications unrelated with the meaning of the title of this pull request, this makes hard to evaluate and accept your pull request.

@kabukky
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@kabukky kabukky commented Jul 29, 2019

Hi @jhsx Sorry, my master has diverged quite a bit by now.

The relevant changes are all in this commit:
kabukky@b2a337d

I'm still not sure if this is feasible, since it might have side effects. What is your take on it?

Kai Hagelstein and others added 3 commits Aug 2, 2019
Kai Hagelstein
Changed how the state is reset after previous usage
give better out-of-range error message in index expression evaluation
@annismckenzie
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@annismckenzie annismckenzie commented Jan 3, 2020

Can you pull out kabukky@b2a337d into a new PR?

@tooolbox
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@tooolbox tooolbox commented Jul 1, 2020

@kabukky I believe this was handled with #152 but please chime in if it doesn't fit the use case somehow.

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