Check if template implements given interface

[janbarasek]

Hello,

Quite often I need to get a template from a user that can render my mandatory parameters and not use anything else. For example, an email template in an e-shop can only use predefined parameters, and anything extra will be rendered incorrectly (because the variable does not exist).

Latte could include a native way to see what all parameters the template implements (plus a list of keys in the array, if it's a $var['abcd'] notation for example). At the same time, there should be a check.

The implementation may use, for example, a native PHP interface where we scan for real typehints for methods, or at least an array of parameters from the user.

I know I can compile the Latte template to native PHP code, and then verify the connection with PhpStan, but this behavior is simply not possible to run on a production server where we receive a specific template from the user.

Thank you.

[MartinMystikJonas]

I am not sure I understand your use case correctly but how about macro {parameters} - it defines what parameters can be used in template and everything else is undefined. So you can just prepend this macto to template code from user and try to render it.

[MartinMystikJonas]

Problem with generating list of all used parameters and keys in the array is that it can be accessed dynamically.