Determine if a validation should be executed based on any conditions provided

Examples

If an attribute is/isn't present (non-blank):

iex> Vex.Validator.validate?([name: "foo", state: "new"], if: :state)
true
iex> Vex.Validator.validate?([name: "foo", state: "new"], unless: :state)
false

If an attribute does/doesn't match a value:

iex> Vex.Validator.validate?([name: "foo", state: "new"], if: [state: "new"])
true
iex> Vex.Validator.validate?([name: "foo", state: "persisted"], if: [state: "new"])
false
iex> Vex.Validator.validate?([name: "foo", state: "new"], unless: [state: "new"])
false
iex> Vex.Validator.validate?([name: "foo", state: "persisted"], unless: [state: "new"])
true

If the data does/doesn't match another custom condition:

iex> Vex.Validator.validate?([name: "foo"], if: &(&1[:name] == "foo"))
true
iex> Vex.Validator.validate?([name: "foo"], unless: &(&1[:name] == "foo"))
false
iex> Vex.Validator.validate?([name: "foo"], if: &(&1[:name] != "foo"))
false
iex> Vex.Validator.validate?([name: "foo"], unless: &(&1[:name] != "foo"))
true

If the data does/doesn't match a list of conditions:

iex> Vex.Validator.validate?([name: "foo", state: "new"], if: [name: "foo", state: "new"])
true
iex> Vex.Validator.validate?([name: "foo", state: "persisted"], if: [name: "foo", state: "new"])
false
iex> Vex.Validator.validate?([name: "foo", state: "persisted"], if_any: [name: "foo", state: "new"])
true
iex> Vex.Validator.validate?([name: "foo", state: "persisted"], if_any: [name: "bar", state: "new"])
false
iex> Vex.Validator.validate?([name: "foo", state: "new"], unless: [name: "foo", state: "new"])
false
iex> Vex.Validator.validate?([name: "foo", state: "persisted"], unless: [name: "foo", state: "new"])
true
iex> Vex.Validator.validate?([name: "foo", state: "persisted"], unless_any: [name: "foo", state: "new"])
false
iex> Vex.Validator.validate?([name: "foo", state: "persisted"], unless_any: [name: "bar", state: "new"])
true