feat(support): add inflector for pluralization and word casing

lib/prism/support/inflector.rb

@@ -0,0 +1,49 @@
+module Prism
+  module Inflector
+    module_function
+
+    def underscore(string)
+      string.to_s
+        .gsub(/::/, '/')
+        .gsub(/([A-Z]+)([A-Z][a-z])/, '\1_\2')
+        .gsub(/([a-z\d])([A-Z])/, '\1_\2')
+        .tr('-', '_')
+        .downcase
+    end
+
+    def camelize(string)
+      string.to_s.split(/_|\//).map { |part| part[0]&.upcase.to_s + part[1..].to_s }.join
+    end
+
+    def pluralize(word)
+      text = word.to_s
+      return text if text.empty?
+      case text
+      when /(?:s|x|z|ch|sh)\z/ then "#{text}es"
+      when /([^aeiou])y\z/ then "#{text[0..-2]}ies"
+      when /fe?\z/ then text.sub(/fe?\z/, 'ves')
+      when /s\z/ then text
+      else "#{text}s"
+      end
+    end
+
+    def singularize(word)
+      text = word.to_s
+      case text
+      when /ies\z/ then "#{text[0..-4]}y"
+      when /ves\z/ then "#{text[0..-4]}fe"
+      when /(?:s|x|z|ch|sh)es\z/ then text[0..-3]
+      when /s\z/ then text[0..-2]
+      else text
+      end
+    end
+
+    def tableize(class_name)
+      pluralize(underscore(class_name.to_s.split('::').last))
+    end
+
+    def classify(table_name)
+      camelize(singularize(table_name.to_s))
+    end
+  end
+end