Class: ActiveSupport::Inflector::Inflections

Inherits:
Object
  • Object
show all
Defined in:
activesupport/lib/active_support/inflector/inflections.rb

Overview

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.

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initializeInflections


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# File 'activesupport/lib/active_support/inflector/inflections.rb', line 27

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

Instance Attribute Details

#acronym_regexObject (readonly)

Returns the value of attribute acronym_regex


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# File 'activesupport/lib/active_support/inflector/inflections.rb', line 25

def acronym_regex
  @acronym_regex
end

#acronymsObject (readonly)

Returns the value of attribute acronyms


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# File 'activesupport/lib/active_support/inflector/inflections.rb', line 25

def acronyms
  @acronyms
end

#humansObject (readonly)

Returns the value of attribute humans


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# File 'activesupport/lib/active_support/inflector/inflections.rb', line 25

def humans
  @humans
end

#pluralsObject (readonly)

Returns the value of attribute plurals


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# File 'activesupport/lib/active_support/inflector/inflections.rb', line 25

def plurals
  @plurals
end

#singularsObject (readonly)

Returns the value of attribute singulars


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# File 'activesupport/lib/active_support/inflector/inflections.rb', line 25

def singulars
  @singulars
end

#uncountablesObject (readonly)

Returns the value of attribute uncountables


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# File 'activesupport/lib/active_support/inflector/inflections.rb', line 25

def uncountables
  @uncountables
end

Class Method Details

.instanceObject


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# File 'activesupport/lib/active_support/inflector/inflections.rb', line 21

def self.instance
  @__instance__ ||= new
end

Instance Method Details

#acronym(word) ⇒ Object

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'

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# File 'activesupport/lib/active_support/inflector/inflections.rb', line 77

def acronym(word)
  @acronyms[word.downcase] = word
  @acronym_regex = /#{@acronyms.values.join("|")}/
end

#clear(scope = :all) ⇒ Object

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.

Examples:

clear :all
clear :plurals

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# File 'activesupport/lib/active_support/inflector/inflections.rb', line 149

def clear(scope = :all)
  case scope
    when :all
      @plurals, @singulars, @uncountables, @humans = [], [], [], []
    else
      instance_variable_set "@#{scope}", []
  end
end

#human(rule, replacement) ⇒ Object

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"

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# File 'activesupport/lib/active_support/inflector/inflections.rb', line 138

def human(rule, replacement)
  @humans.insert(0, [rule, replacement])
end

#irregular(singular, plural) ⇒ Object

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'

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# File 'activesupport/lib/active_support/inflector/inflections.rb', line 104

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

#plural(rule, replacement) ⇒ Object

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.


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# File 'activesupport/lib/active_support/inflector/inflections.rb', line 84

def plural(rule, replacement)
  @uncountables.delete(rule) if rule.is_a?(String)
  @uncountables.delete(replacement)
  @plurals.insert(0, [rule, replacement])
end

#singular(rule, replacement) ⇒ Object

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.


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# File 'activesupport/lib/active_support/inflector/inflections.rb', line 92

def singular(rule, replacement)
  @uncountables.delete(rule) if rule.is_a?(String)
  @uncountables.delete(replacement)
  @singulars.insert(0, [rule, replacement])
end

#uncountable(*words) ⇒ Object

Add uncountable words that shouldn't be attempted inflected.

Examples:

uncountable "money"
uncountable "money", "information"
uncountable %w( money information rice )

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# File 'activesupport/lib/active_support/inflector/inflections.rb', line 127

def uncountable(*words)
  (@uncountables << words).flatten!
end