require 'singleton' # The Inflector transforms words from singular to plural, class names to table names, modularized class names to ones without, # and class names to foreign keys. The default inflections for pluralization, singularization, and uncountable words are kept # in inflections.rb. module Inflector # A singleton instance of this class is yielded by Inflector.inflections, which can then be used to specify additional # inflection rules. Examples: # # Inflector.inflections do |inflect| # inflect.plural /^(ox)$/i, '\1\2en' # inflect.singular /^(ox)en/i, '\1' # # inflect.irregular 'octopus', 'octopi' # # inflect.uncountable "equipment" # end # # New rules are added at the top. So in the example above, the irregular rule for octopus will now be the first of the # pluralization and singularization rules that is runs. This guarantees that your rules run before any of the rules that may # already have been loaded. class Inflections include Singleton attr_reader :plurals, :singulars, :uncountables def initialize @plurals, @singulars, @uncountables = [], [], [] end # Specifies a new pluralization rule and its replacement. The rule can either be a string or a regular expression. # The replacement should always be a string that may include references to the matched data from the rule. def plural(rule, replacement) @plurals.insert(0, [rule, replacement]) end # Specifies a new singularization rule and its replacement. The rule can either be a string or a regular expression. # The replacement should always be a string that may include references to the matched data from the rule. def singular(rule, replacement) @singulars.insert(0, [rule, replacement]) end # Specifies a new irregular that applies to both pluralization and singularization at the same time. This can only be used # for strings, not regular expressions. You simply pass the irregular in singular and plural form. # # Examples: # irregular 'octopus', 'octopi' # irregular 'person', 'people' def irregular(singular, plural) plural(Regexp.new("(#{singular[0,1]})#{singular[1..-1]}$", "i"), '\1' + plural[1..-1]) singular(Regexp.new("(#{plural[0,1]})#{plural[1..-1]}$", "i"), '\1' + singular[1..-1]) end # Add uncountable words that shouldn't be attempted inflected. # # Examples: # uncountable "money" # uncountable "money", "information" # uncountable %w( money information rice ) def uncountable(*words) (@uncountables << words).flatten! end # Clears the loaded inflections within a given scope (default is :all). Give the scope as a symbol of the inflection type, # the options are: :plurals, :singulars, :uncountables # # Examples: # clear :all # clear :plurals def clear(scope = :all) case scope when :all @plurals, @singulars, @uncountables = [], [], [] else instance_variable_set "@#{scope}", [] end end end extend self def inflections if block_given? yield Inflections.instance else Inflections.instance end end def pluralize(word) result = word.to_s.dup if inflections.uncountables.include?(result.downcase) result else inflections.plurals.each { |(rule, replacement)| break if result.gsub!(rule, replacement) } result end end def singularize(word) result = word.to_s.dup if inflections.uncountables.include?(result.downcase) result else inflections.singulars.each { |(rule, replacement)| break if result.gsub!(rule, replacement) } result end end def camelize(lower_case_and_underscored_word) lower_case_and_underscored_word.to_s.gsub(/\/(.?)/) { "::" + $1.upcase }.gsub(/(^|_)(.)/) { $2.upcase } end def titleize(word) humanize(underscore(word)).gsub(/\b([a-z])/) { $1.capitalize } end def underscore(camel_cased_word) camel_cased_word.to_s.gsub(/::/, '/').gsub(/([A-Z]+)([A-Z][a-z])/,'\1_\2').gsub(/([a-z\d])([A-Z])/,'\1_\2').downcase end def humanize(lower_case_and_underscored_word) lower_case_and_underscored_word.to_s.gsub(/_id$/, "").gsub(/_/, " ").capitalize end def demodulize(class_name_in_module) class_name_in_module.to_s.gsub(/^.*::/, '') end def tableize(class_name) pluralize(underscore(class_name)) end def classify(table_name) camelize(singularize(table_name)) end def foreign_key(class_name, separate_class_name_and_id_with_underscore = true) underscore(demodulize(class_name)) + (separate_class_name_and_id_with_underscore ? "_id" : "id") end def constantize(camel_cased_word) raise NameError, "#{camel_cased_word.inspect} is not a valid constant name!" unless camel_cased_word.split("::").all? { |part| /^[A-Z]\w*$/ =~ part } camel_cased_word = "::#{camel_cased_word}" unless camel_cased_word[0, 2] == '::' Object.module_eval(camel_cased_word, __FILE__, __LINE__) end def ordinalize(number) if (11..13).include?(number.to_i % 100) "#{number}th" else case number.to_i % 10 when 1: "#{number}st" when 2: "#{number}nd" when 3: "#{number}rd" else "#{number}th" end end end end require File.dirname(__FILE__) + '/inflections'