Create new guard noneExcept(var1, var2, ...)

[zambrovski]

Scenario

I want to be able to specify a whitelist of variables that needs to be present in the provided scope. No other variables are allowed.

Something like:

val conditions = listOf(
  noneExcept(VAR1, VAR2),
  hasValue(VAR1, "foo"),
  matches(VAR2) { it > 234 }
)

The problem with the noneExcept condition is, that it can not be defined on a single VariableFactory and thus is not matching the abstract class VariableFactoryCondition<T>.

Alternative approach would be to define a new Guard, which is checking conditions on the whole context (like in this case).

[zambrovski]

What do you think, @jangalinski ?

[jangalinski]

like it ... but "noneExcept" ... would sound better with "hasOnly" or stlt

[zambrovski]

The problem is the signature. hasOnly(varargs factories: VariableFactory) means that the return type of this method is not an VariableGuardCondition<T>, because of:

abstract class VariableGuardCondition<T>(
  internal val variableFactory: VariableFactory<T>,
  internal val local: Boolean = false
) { ... }

It is not a guard on one factory, but on the entire context....

[jangalinski]

ok.

[zambrovski]

So it is meant as a question, I don't have a solution yet...