feat: Allow formatting for Last Name only

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 
 - Support for parsing Gaelic names
+- Allow formatting for Last Name only
 
 ## [0.1.0] - 2024-06-28
 Initial realase

lib/gaelic_name_formatter.rb

@@ -1,6 +1,6 @@
 class GaelicNameFormatter
-  PREFIXES = %w(Mac Mc Ó O' Ní Nic Bean Mhic Vuic Uí De Dè Gil Gille).freeze
-  SUFFIXES = %w(ach an àr nam riss aigh aidh ain án éis ín).freeze
+  PREFIXES = %w[Mac Mc Ó O' Ní Nic Bean Mhic Vuic Uí De Dè Gil Gille].freeze
+  SUFFIXES = %w[ach an àr nam riss aigh aidh ain án éis ín].freeze
 
   PREFIX_PATTERNS = [
     /^(Gill)(An.*)/i,
@@ -51,7 +51,7 @@ class GaelicNameFormatter
     /^(Mac)(Mh.+)([Ìì].+)/i,
     /^(Mac)([gdpms]h.*)/i,
     /^(Mac)(R[iÌìou].*)/i,
-    /^(Mac)(R[Ààa][bgiot].*)/i,
+    /^(Mac)(R[Ààa][bgiot].*)/i
   ].freeze
 
   attr_accessor :name

lib/name_formatter.rb

@@ -26,15 +26,19 @@ class NameFormatter
 
   PARTICLE_REGEX = /^(de[rsl]|d[aiu]|v[oa]n|te[nr]|la|les|y|and|zu|dell[ao])$/i
 
-  def parse(name)
+  def parse(name, last_name_only: false)
     return parse_company_name(name) if company_name?(name)
 
     parts = name.strip.split(/\s+/)
 
     prefix = extract_prefix_or_suffix(parts, PREFIXES)
     suffix = extract_prefix_or_suffix(parts.reverse, SUFFIXES)
 
-    if parts.size > 1
+    if last_name_only
+      first_name = nil
+      last_name = parts.reject { |part| part == suffix }.join(" ")
+    elsif parts.size > 1
+
       first_name = parts.shift
       last_name = parts.reject { |part| part == suffix }.join(" ")
       last_name = nil if last_name.empty?
@@ -54,8 +58,8 @@ def parse(name)
     }
   end
 
-  def parse_formatted(name)
-    parsed = parse(name)
+  def parse_formatted(name, **options)
+    parsed = parse(name, **options)
     {
       prefix: format_prefix(parsed[:prefix]),
       first_name: format_first_name(parsed[:first_name]),
@@ -64,8 +68,8 @@ def parse_formatted(name)
     }
   end
 
-  def format(name)
-    parse_formatted(name).values.compact.join(" ")
+  def format(name, **options)
+    parse_formatted(name, **options).values.compact.join(" ")
   end
 
   private

test/name_formatter_test.rb

@@ -112,6 +112,13 @@ def test_edge_cases
     assert_formatted "Denesik-Vandervort", "Denesik-Vandervort".upcase
   end
 
+  def test_last_name_only
+    formatted = @formatter.format("MacIllDhenby".upcase, last_name_only: true)
+    assert_equal "MacIllDhenby", formatted
+    formatted = @formatter.format("MacIllDhenby".upcase, last_name_only: false)
+    assert_equal "Macilldhenby", formatted
+  end
+
   def test_stress
     skip "Long running test"
     100_000.times do