Skip to content
This repository
tag: v3.2.4.rc1
Fetching contributors…

Octocat-spinner-32-eaf2f5

Cannot retrieve contributors at this time

file 173 lines (162 sloc) 7.59 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172
module ActiveSupport
  module Inflector
    # A singleton instance of this class is yielded by Inflector.inflections, which can then be used to specify additional
    # inflection rules. Examples:
    #
    # ActiveSupport::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
      def self.instance
        @__instance__ ||= new
      end

      attr_reader :plurals, :singulars, :uncountables, :humans, :acronyms, :acronym_regex

      def initialize
        @plurals, @singulars, @uncountables, @humans, @acronyms, @acronym_regex = [], [], [], [], {}, /(?=a)b/
      end

      # Specifies a new acronym. An acronym must be specified as it will appear in a camelized string. An underscore
      # string that contains the acronym will retain the acronym when passed to `camelize`, `humanize`, or `titleize`.
      # A camelized string that contains the acronym will maintain the acronym when titleized or humanized, and will
      # convert the acronym into a non-delimited single lowercase word when passed to +underscore+.
      #
      # Examples:
      # acronym 'HTML'
      # titleize 'html' #=> 'HTML'
      # camelize 'html' #=> 'HTML'
      # underscore 'MyHTML' #=> 'my_html'
      #
      # The acronym, however, must occur as a delimited unit and not be part of another word for conversions to recognize it:
      #
      # acronym 'HTTP'
      # camelize 'my_http_delimited' #=> 'MyHTTPDelimited'
      # camelize 'https' #=> 'Https', not 'HTTPs'
      # underscore 'HTTPS' #=> 'http_s', not 'https'
      #
      # acronym 'HTTPS'
      # camelize 'https' #=> 'HTTPS'
      # underscore 'HTTPS' #=> 'https'
      #
      # Note: Acronyms that are passed to `pluralize` will no longer be recognized, since the acronym will not occur as
      # a delimited unit in the pluralized result. To work around this, you must specify the pluralized form as an
      # acronym as well:
      #
      # acronym 'API'
      # camelize(pluralize('api')) #=> 'Apis'
      #
      # acronym 'APIs'
      # camelize(pluralize('api')) #=> 'APIs'
      #
      # `acronym` may be used to specify any word that contains an acronym or otherwise needs to maintain a non-standard
      # capitalization. The only restriction is that the word must begin with a capital letter.
      #
      # Examples:
      # acronym 'RESTful'
      # underscore 'RESTful' #=> 'restful'
      # underscore 'RESTfulController' #=> 'restful_controller'
      # titleize 'RESTfulController' #=> 'RESTful Controller'
      # camelize 'restful' #=> 'RESTful'
      # camelize 'restful_controller' #=> 'RESTfulController'
      #
      # acronym 'McDonald'
      # underscore 'McDonald' #=> 'mcdonald'
      # camelize 'mcdonald' #=> 'McDonald'
      def acronym(word)
        @acronyms[word.downcase] = word
        @acronym_regex = /#{@acronyms.values.join("|")}/
      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)
        @uncountables.delete(rule) if rule.is_a?(String)
        @uncountables.delete(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)
        @uncountables.delete(rule) if rule.is_a?(String)
        @uncountables.delete(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)
        @uncountables.delete(singular)
        @uncountables.delete(plural)
        if singular[0,1].upcase == plural[0,1].upcase
          plural(Regexp.new("(#{singular[0,1]})#{singular[1..-1]}$", "i"), '\1' + plural[1..-1])
          plural(Regexp.new("(#{plural[0,1]})#{plural[1..-1]}$", "i"), '\1' + plural[1..-1])
          singular(Regexp.new("(#{plural[0,1]})#{plural[1..-1]}$", "i"), '\1' + singular[1..-1])
        else
          plural(Regexp.new("#{singular[0,1].upcase}(?i)#{singular[1..-1]}$"), plural[0,1].upcase + plural[1..-1])
          plural(Regexp.new("#{singular[0,1].downcase}(?i)#{singular[1..-1]}$"), plural[0,1].downcase + plural[1..-1])
          plural(Regexp.new("#{plural[0,1].upcase}(?i)#{plural[1..-1]}$"), plural[0,1].upcase + plural[1..-1])
          plural(Regexp.new("#{plural[0,1].downcase}(?i)#{plural[1..-1]}$"), plural[0,1].downcase + plural[1..-1])
          singular(Regexp.new("#{plural[0,1].upcase}(?i)#{plural[1..-1]}$"), singular[0,1].upcase + singular[1..-1])
          singular(Regexp.new("#{plural[0,1].downcase}(?i)#{plural[1..-1]}$"), singular[0,1].downcase + singular[1..-1])
        end
      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

      # Specifies a humanized form of a string by a regular expression rule or by a string mapping.
      # When using a regular expression based replacement, the normal humanize formatting is called after the replacement.
      # When a string is used, the human form should be specified as desired (example: 'The name', not 'the_name')
      #
      # Examples:
      # human /_cnt$/i, '\1_count'
      # human "legacy_col_person_name", "Name"
      def human(rule, replacement)
        @humans.insert(0, [rule, replacement])
      end

      # Clears the loaded inflections within a given scope (default is <tt>:all</tt>).
      # Give the scope as a symbol of the inflection type, the options are: <tt>:plurals</tt>,
      # <tt>:singulars</tt>, <tt>:uncountables</tt>, <tt>:humans</tt>.
      #
      # Examples:
      # clear :all
      # clear :plurals
      def clear(scope = :all)
        case scope
          when :all
            @plurals, @singulars, @uncountables, @humans = [], [], [], []
          else
            instance_variable_set "@#{scope}", []
        end
      end
    end

    # Yields a singleton instance of Inflector::Inflections so you can specify additional
    # inflector rules.
    #
    # Example:
    # ActiveSupport::Inflector.inflections do |inflect|
    # inflect.uncountable "rails"
    # end
    def inflections
      if block_given?
        yield Inflections.instance
      else
        Inflections.instance
      end
    end
  end
end
Something went wrong with that request. Please try again.