How to extract all variables in a Mustache Template in Java

[panikumar malepati]

Hi all,

   We have a requirement to extract all the variables from the Mustache Template. We need to identify the variables then query the values from other sub system. I'd appreciate if someone could provide a solution to this in Java. 

We are using the following library:

https://github.com/spullara/mustache.java

package: com.github.spullara.mustache.java

version: 0.9.2

[Sam Pullara]

Can you give an example template and what you would do with each variable? It sounds like you want to avoid putting a view layer between the template and the raw data which usually leads to problems. Getting a structured tree of variables found in the template is possible using your own object handler that records it as it is executed. 

Sam

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[panikumar malepati]

Hi Sam, 

     There is no view layer attached in between the template and the raw data. templates are stored in our system from a source. we need to identify the variables in the template to collect the values from another system. basically, is there a way to extract all variables embedded in a text/html templates. 

Sample plain text template: "Hello your loan is submissted {{loanId}}"

 Hope the above helps.

[panikumar malepati]

HI all,

    Could you please help if there is a way extract variables {{}} embedded in a plain text/html templates? I only see the way to extract them using string matcher pattern. 

-Thanks,

[Sam Pullara]

A custom ObjectHandler will get a callback for each variable. Create a factory, set your object handler and then execute. In the callback collect the names of the variables. Use that list of names to create a map with the keys and values. Then use mustache normally with that map. I still don't recommend architecting things this way but it is doable. 

Sam

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[Sam]

Based on walking the parse tree you can also do this:

https://gist.github.com/spullara/72ebb61fd07b9bcda7e522a3a9dcd9c5

That will let you see the values that are present in the template. This is probably a lot easier than using an ObjectHandler in this case. 

Sam

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