lib/regexp-examples/helpers.rb in regexp-examples-1.1.4 vs lib/regexp-examples/helpers.rb in regexp-examples-1.2.0

@@ -4,14 +4,18 @@
   # for strings, created by joining one element from each array
   #
   # For example:
   # permutations_of_strings [ ['a'], ['b'], ['c', 'd', 'e'] ] #=> ['abc', 'abd', 'abe']
   # permutations_of_strings [ ['a', 'b'], ['c', 'd'] ] #=> [ 'ac', 'ad', 'bc', 'bd' ]
-  def self.permutations_of_strings(arrays_of_strings)
-    first = arrays_of_strings.shift
-    return first if arrays_of_strings.empty?
-    first.product(permutations_of_strings(arrays_of_strings)).map do |result|
+  #
+  # Edge case:
+  # permutations_of_strings [ [] ] #=> nil
+  # (For example, ths occurs during /[^\d\D]/.examples #=> [])
+  def self.permutations_of_strings(arrays_of_strings, max_results_limiter = MaxResultsLimiterByProduct.new)
+    partial_result = max_results_limiter.limit_results(arrays_of_strings.shift)
+    return partial_result if arrays_of_strings.empty?
+    partial_result.product(permutations_of_strings(arrays_of_strings, max_results_limiter)).map do |result|
       join_preserving_capture_groups(result)
     end
   end
 
   def self.join_preserving_capture_groups(result)
@@ -23,23 +27,11 @@
                 .uniq(&:group_id)
 
     GroupResult.new(result.join, nil, subgroups)
   end
 
-  def self.map_results(repeaters)
-    generic_map_result(repeaters, :result)
-  end
-
-  def self.map_random_result(repeaters)
-    generic_map_result(repeaters, :random_result)
-  end
-
-  private
-
   def self.generic_map_result(repeaters, method)
-    repeaters
-      .map { |repeater| repeater.public_send(method) }
-      .instance_eval do |partial_results|
-        RegexpExamples.permutations_of_strings(partial_results)
-      end
+    permutations_of_strings(
+      repeaters.map { |repeater| repeater.public_send(method) }
+    )
   end
 end