require 'thread_safe'
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 <tt>:en</tt>. 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
@__instance__ = ThreadSafe::Cache.new
def self.instance(locale = :en)
@__instance__[locale] ||= new
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)
s0 = singular[0]
srest = singular[1..-1]
p0 = plural[0]
prest = plural[1..-1]
if s0.upcase == p0.upcase
plural(/(#{s0})#{srest}$/i, '\1' + prest)
plural(/(#{p0})#{prest}$/i, '\1' + prest)
singular(/(#{s0})#{srest}$/i, '\1' + srest)
singular(/(#{p0})#{prest}$/i, '\1' + srest)
else
plural(/#{s0.upcase}(?i)#{srest}$/, p0.upcase + prest)
plural(/#{s0.downcase}(?i)#{srest}$/, p0.downcase + prest)
plural(/#{p0.upcase}(?i)#{prest}$/, p0.upcase + prest)
plural(/#{p0.downcase}(?i)#{prest}$/, p0.downcase + prest)
singular(/#{s0.upcase}(?i)#{srest}$/, s0.upcase + srest)
singular(/#{s0.downcase}(?i)#{srest}$/, s0.downcase + srest)
singular(/#{p0.upcase}(?i)#{prest}$/, s0.upcase + srest)
singular(/#{p0.downcase}(?i)#{prest}$/, s0.downcase + srest)
end
end
# Add uncountable words that shouldn't be attempted inflected.
#
# uncountable 'money'
# uncountable 'money', 'information'
# uncountable %w( money information rice )
def uncountable(*words)
(@uncountables << words).flatten!
end
# Specifies a humanized form of a string by a regular expression rule or
# by a string mapping. When using a regular expression based replacement,
# the normal humanize formatting is called after the replacement. When a
# string is used, the human form should be specified as desired (example:
# 'The name', not 'the_name').
#
# human /_cnt$/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
# <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>.
#
# 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 <tt>:en</tt>.
# 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
