lib/active_support/inflector.rb in activesupport-3.0.pre vs lib/active_support/inflector.rb in activesupport-3.0.0.rc
- old
+ new
@@ -1,410 +1,7 @@
-# encoding: utf-8
-require 'iconv'
-require 'active_support/core_ext/object/blank'
-require 'active_support/core_ext/string/access'
-require 'active_support/core_ext/string/multibyte'
-
-module ActiveSupport
- # The Inflector transforms words from singular to plural, class names to table names, modularized class names to ones without,
- # and class names to foreign keys. The default inflections for pluralization, singularization, and uncountable words are kept
- # in inflections.rb.
- #
- # The Rails core team has stated patches for the inflections library will not be accepted
- # in order to avoid breaking legacy applications which may be relying on errant inflections.
- # If you discover an incorrect inflection and require it for your application, you'll need
- # to correct it yourself (explained below).
- 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. Examples:
- #
- # ActiveSupport::Inflector.inflections do |inflect|
- # inflect.plural /^(ox)$/i, '\1\2en'
- # inflect.singular /^(ox)en/i, '\1'
- #
- # inflect.irregular 'octopus', 'octopi'
- #
- # inflect.uncountable "equipment"
- # end
- #
- # New rules are added at the top. So in the example above, the irregular rule for octopus will now be the first of the
- # pluralization and singularization rules that is runs. This guarantees that your rules run before any of the rules that may
- # already have been loaded.
- class Inflections
- def self.instance
- @__instance__ ||= new
- end
-
- attr_reader :plurals, :singulars, :uncountables, :humans
-
- def initialize
- @plurals, @singulars, @uncountables, @humans = [], [], [], []
- end
-
- # Specifies a new pluralization rule and its replacement. The rule can either be a string or a regular expression.
- # The replacement should always be a string that may include references to the matched data from the rule.
- def plural(rule, replacement)
- @uncountables.delete(rule) if rule.is_a?(String)
- @uncountables.delete(replacement)
- @plurals.insert(0, [rule, replacement])
- end
-
- # Specifies a new singularization rule and its replacement. The rule can either be a string or a regular expression.
- # The replacement should always be a string that may include references to the matched data from the rule.
- def singular(rule, replacement)
- @uncountables.delete(rule) if rule.is_a?(String)
- @uncountables.delete(replacement)
- @singulars.insert(0, [rule, replacement])
- end
-
- # Specifies a new irregular that applies to both pluralization and singularization at the same time. This can only be used
- # for strings, not regular expressions. You simply pass the irregular in singular and plural form.
- #
- # Examples:
- # irregular 'octopus', 'octopi'
- # irregular 'person', 'people'
- def irregular(singular, plural)
- @uncountables.delete(singular)
- @uncountables.delete(plural)
- if singular[0,1].upcase == plural[0,1].upcase
- plural(Regexp.new("(#{singular[0,1]})#{singular[1..-1]}$", "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 = [], [], []
- 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
-
- # Returns the plural form of the word in the string.
- #
- # Examples:
- # "post".pluralize # => "posts"
- # "octopus".pluralize # => "octopi"
- # "sheep".pluralize # => "sheep"
- # "words".pluralize # => "words"
- # "CamelOctopus".pluralize # => "CamelOctopi"
- def pluralize(word)
- result = word.to_s.dup
-
- if word.empty? || inflections.uncountables.include?(result.downcase)
- result
- else
- inflections.plurals.each { |(rule, replacement)| break if result.gsub!(rule, replacement) }
- result
- end
- end
-
- # The reverse of +pluralize+, returns the singular form of a word in a string.
- #
- # Examples:
- # "posts".singularize # => "post"
- # "octopi".singularize # => "octopus"
- # "sheep".singularize # => "sheep"
- # "word".singularize # => "word"
- # "CamelOctopi".singularize # => "CamelOctopus"
- def singularize(word)
- result = word.to_s.dup
-
- if inflections.uncountables.include?(result.downcase)
- result
- else
- inflections.singulars.each { |(rule, replacement)| break if result.gsub!(rule, replacement) }
- result
- end
- end
-
- # By default, +camelize+ converts strings to UpperCamelCase. If the argument to +camelize+
- # is set to <tt>:lower</tt> then +camelize+ produces lowerCamelCase.
- #
- # +camelize+ will also convert '/' to '::' which is useful for converting paths to namespaces.
- #
- # Examples:
- # "active_record".camelize # => "ActiveRecord"
- # "active_record".camelize(:lower) # => "activeRecord"
- # "active_record/errors".camelize # => "ActiveRecord::Errors"
- # "active_record/errors".camelize(:lower) # => "activeRecord::Errors"
- def camelize(lower_case_and_underscored_word, first_letter_in_uppercase = true)
- if first_letter_in_uppercase
- lower_case_and_underscored_word.to_s.gsub(/\/(.?)/) { "::#{$1.upcase}" }.gsub(/(?:^|_)(.)/) { $1.upcase }
- else
- lower_case_and_underscored_word.to_s.first.downcase + camelize(lower_case_and_underscored_word)[1..-1]
- end
- end
-
- # Capitalizes all the words and replaces some characters in the string to create
- # a nicer looking title. +titleize+ is meant for creating pretty output. It is not
- # used in the Rails internals.
- #
- # +titleize+ is also aliased as as +titlecase+.
- #
- # Examples:
- # "man from the boondocks".titleize # => "Man From The Boondocks"
- # "x-men: the last stand".titleize # => "X Men: The Last Stand"
- def titleize(word)
- humanize(underscore(word)).gsub(/\b('?[a-z])/) { $1.capitalize }
- end
-
- # The reverse of +camelize+. Makes an underscored, lowercase form from the expression in the string.
- #
- # Changes '::' to '/' to convert namespaces to paths.
- #
- # Examples:
- # "ActiveRecord".underscore # => "active_record"
- # "ActiveRecord::Errors".underscore # => active_record/errors
- def underscore(camel_cased_word)
- camel_cased_word.to_s.gsub(/::/, '/').
- gsub(/([A-Z]+)([A-Z][a-z])/,'\1_\2').
- gsub(/([a-z\d])([A-Z])/,'\1_\2').
- tr("-", "_").
- downcase
- end
-
- # Replaces underscores with dashes in the string.
- #
- # Example:
- # "puni_puni" # => "puni-puni"
- def dasherize(underscored_word)
- underscored_word.gsub(/_/, '-')
- end
-
- # Capitalizes the first word and turns underscores into spaces and strips a
- # trailing "_id", if any. Like +titleize+, this is meant for creating pretty output.
- #
- # Examples:
- # "employee_salary" # => "Employee salary"
- # "author_id" # => "Author"
- def humanize(lower_case_and_underscored_word)
- result = lower_case_and_underscored_word.to_s.dup
-
- inflections.humans.each { |(rule, replacement)| break if result.gsub!(rule, replacement) }
- result.gsub(/_id$/, "").gsub(/_/, " ").capitalize
- end
-
- # Removes the module part from the expression in the string.
- #
- # Examples:
- # "ActiveRecord::CoreExtensions::String::Inflections".demodulize # => "Inflections"
- # "Inflections".demodulize # => "Inflections"
- def demodulize(class_name_in_module)
- class_name_in_module.to_s.gsub(/^.*::/, '')
- end
-
- # Replaces special characters in a string so that it may be used as part of a 'pretty' URL.
- #
- # ==== Examples
- #
- # class Person
- # def to_param
- # "#{id}-#{name.parameterize}"
- # end
- # end
- #
- # @person = Person.find(1)
- # # => #<Person id: 1, name: "Donald E. Knuth">
- #
- # <%= link_to(@person.name, person_path(@person)) %>
- # # => <a href="/person/1-donald-e-knuth">Donald E. Knuth</a>
- def parameterize(string, sep = '-')
- # replace accented chars with their ascii equivalents
- parameterized_string = transliterate(string)
- # Turn unwanted chars into the separator
- parameterized_string.gsub!(/[^a-z0-9\-_\+]+/i, sep)
- unless sep.blank?
- re_sep = Regexp.escape(sep)
- # No more than one of the separator in a row.
- parameterized_string.gsub!(/#{re_sep}{2,}/, sep)
- # Remove leading/trailing separator.
- parameterized_string.gsub!(/^#{re_sep}|#{re_sep}$/i, '')
- end
- parameterized_string.downcase
- end
-
-
- # Replaces accented characters with their ascii equivalents.
- def transliterate(string)
- Iconv.iconv('ascii//ignore//translit', 'utf-8', string).to_s
- end
-
- if RUBY_VERSION >= '1.9'
- undef_method :transliterate
- def transliterate(string)
- warn "Ruby 1.9 doesn't support Unicode normalization yet"
- string.dup
- end
-
- # The iconv transliteration code doesn't function correctly
- # on some platforms, but it's very fast where it does function.
- elsif "foo" != (Inflector.transliterate("föö") rescue nil)
- undef_method :transliterate
- def transliterate(string)
- string.mb_chars.normalize(:kd). # Decompose accented characters
- gsub(/[^\x00-\x7F]+/, '') # Remove anything non-ASCII entirely (e.g. diacritics).
- end
- end
-
- # Create the name of a table like Rails does for models to table names. This method
- # uses the +pluralize+ method on the last word in the string.
- #
- # Examples
- # "RawScaledScorer".tableize # => "raw_scaled_scorers"
- # "egg_and_ham".tableize # => "egg_and_hams"
- # "fancyCategory".tableize # => "fancy_categories"
- def tableize(class_name)
- pluralize(underscore(class_name))
- end
-
- # Create a class name from a plural table name like Rails does for table names to models.
- # Note that this returns a string and not a Class. (To convert to an actual class
- # follow +classify+ with +constantize+.)
- #
- # Examples:
- # "egg_and_hams".classify # => "EggAndHam"
- # "posts".classify # => "Post"
- #
- # Singular names are not handled correctly:
- # "business".classify # => "Busines"
- def classify(table_name)
- # strip out any leading schema name
- camelize(singularize(table_name.to_s.sub(/.*\./, '')))
- end
-
- # Creates a foreign key name from a class name.
- # +separate_class_name_and_id_with_underscore+ sets whether
- # the method should put '_' between the name and 'id'.
- #
- # Examples:
- # "Message".foreign_key # => "message_id"
- # "Message".foreign_key(false) # => "messageid"
- # "Admin::Post".foreign_key # => "post_id"
- def foreign_key(class_name, separate_class_name_and_id_with_underscore = true)
- underscore(demodulize(class_name)) + (separate_class_name_and_id_with_underscore ? "_id" : "id")
- end
-
- # Ruby 1.9 introduces an inherit argument for Module#const_get and
- # #const_defined? and changes their default behavior.
- if Module.method(:const_get).arity == 1
- # Tries to find a constant with the name specified in the argument string:
- #
- # "Module".constantize # => Module
- # "Test::Unit".constantize # => Test::Unit
- #
- # The name is assumed to be the one of a top-level constant, no matter whether
- # it starts with "::" or not. No lexical context is taken into account:
- #
- # C = 'outside'
- # module M
- # C = 'inside'
- # C # => 'inside'
- # "C".constantize # => 'outside', same as ::C
- # end
- #
- # NameError is raised when the name is not in CamelCase or the constant is
- # unknown.
- def constantize(camel_cased_word)
- names = camel_cased_word.split('::')
- names.shift if names.empty? || names.first.empty?
-
- constant = Object
- names.each do |name|
- constant = constant.const_defined?(name) ? constant.const_get(name) : constant.const_missing(name)
- end
- constant
- end
- else
- def constantize(camel_cased_word) #:nodoc:
- names = camel_cased_word.split('::')
- names.shift if names.empty? || names.first.empty?
-
- constant = Object
- names.each do |name|
- constant = constant.const_get(name, false) || constant.const_missing(name)
- end
- constant
- end
- end
-
- # Turns a number into an ordinal string used to denote the position in an
- # ordered sequence such as 1st, 2nd, 3rd, 4th.
- #
- # Examples:
- # ordinalize(1) # => "1st"
- # ordinalize(2) # => "2nd"
- # ordinalize(1002) # => "1002nd"
- # ordinalize(1003) # => "1003rd"
- def ordinalize(number)
- if (11..13).include?(number.to_i % 100)
- "#{number}th"
- else
- case number.to_i % 10
- when 1; "#{number}st"
- when 2; "#{number}nd"
- when 3; "#{number}rd"
- else "#{number}th"
- end
- end
- end
- end
-end
-
# in case active_support/inflector is required without the rest of active_support
+require 'active_support/inflector/inflections'
+require 'active_support/inflector/transliterate'
+require 'active_support/inflector/methods'
+
require 'active_support/inflections'
require 'active_support/core_ext/string/inflections'