require 'active_support/core_ext/array/prepend_and_append' require 'active_support/i18n' module ActiveSupport module Inflector extend self # A singleton instance of this class is yielded by Inflector.inflections, # which can then be used to specify additional inflection rules. If passed # an optional locale, rules for other languages can be specified. The # default locale is :en. Only rules for English are provided. # # ActiveSupport::Inflector.inflections(:en) 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(locale = :en) @__instance__ ||= Hash.new { |h, k| h[k] = new } @__instance__[locale] end attr_reader :plurals, :singulars, :uncountables, :humans, :acronyms, :acronym_regex def initialize @plurals, @singulars, @uncountables, @humans, @acronyms, @acronym_regex = [], [], [], [], {}, /(?=a)b/ end # Private, for the test suite. def initialize_dup(orig) # :nodoc: %w(plurals singulars uncountables humans acronyms acronym_regex).each do |scope| instance_variable_set("@#{scope}", orig.send(scope).dup) end 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+. # # 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. # # 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.prepend([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.prepend([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. # # 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. # # 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'). # # human /_cnt$/i, '\1_count' # human 'legacy_col_person_name', 'Name' def human(rule, replacement) @humans.prepend([rule, replacement]) 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, # :humans. # # 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. If passed an optional locale, rules for other # languages can be specified. If not specified, defaults to :en. # Only rules for English are provided. # # ActiveSupport::Inflector.inflections(:en) do |inflect| # inflect.uncountable 'rails' # end def inflections(locale = :en) if block_given? yield Inflections.instance(locale) else Inflections.instance(locale) end end end end