Class: ActiveSupport::Inflector::Inflections

Inherits:
Object
  • Object
show all
Includes:
Singleton
Defined in:
lib/active_support/inflector.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

Instance Method Summary collapse

Constructor Details

#initializeInflections

Returns a new instance of Inflections.


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# File 'lib/active_support/inflector.rb', line 37

def initialize
  @plurals, @singulars, @uncountables, @humans = [], [], [], []
end

Instance Attribute Details

#humansObject (readonly)

Returns the value of attribute humans


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# File 'lib/active_support/inflector.rb', line 35

def humans
  @humans
end

#pluralsObject (readonly)

Returns the value of attribute plurals


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# File 'lib/active_support/inflector.rb', line 35

def plurals
  @plurals
end

#singularsObject (readonly)

Returns the value of attribute singulars


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# File 'lib/active_support/inflector.rb', line 35

def singulars
  @singulars
end

#uncountablesObject (readonly)

Returns the value of attribute uncountables


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# File 'lib/active_support/inflector.rb', line 35

def uncountables
  @uncountables
end

Instance Method Details

#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 'lib/active_support/inflector.rb', line 105

def clear(scope = :all)
  case scope
    when :all
      @plurals, @singulars, @uncountables = [], [], []
    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 'lib/active_support/inflector.rb', line 94

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 'lib/active_support/inflector.rb', line 63

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]}$", "i"), '\1' + plural[1..-1])
    singular(Regexp.new("(#{plural[0,1]})#{plural[1..-1]}$", "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])
    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 'lib/active_support/inflector.rb', line 43

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 'lib/active_support/inflector.rb', line 51

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 'lib/active_support/inflector.rb', line 83

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