Function Contains

runtime/sam/expr/boolean.go:268–278

Given a predicate for comparing individual elements, produce a new predicate that implements the "in" comparison.

(compare Boolean)

// Given a predicate for comparing individual elements, produce a new
// predicate that implements the "in" comparison.
func Contains(compare Boolean) Boolean {
	return func(val super.Value) super.Value {
		err := val.Walk(func(typ super.Type, body scode.Bytes) error {
			if compare(super.NewValue(typ, body)) == super.True {
				return errMatch
			}
			return nil
		})
		return super.NewBool(err == errMatch)
	}
}

// Comparison returns a Predicate for comparing this value to other values.
// The op argument is one of "==", "!=", "<", "<=", ">", ">=".