Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with
or
.
Download ZIP
Branch: inflector-with…
Fetching contributors…

Cannot retrieve contributors at this time

356 lines (328 sloc) 13.337 kB
# encoding: utf-8
require 'active_support/inflector/inflections'
require 'active_support/inflector/memoization'
require 'active_support/inflections'
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 or wish to define rules for languages other
# than English, please correct or add them yourself (explained below).
module Inflector
extend self
# Returns the plural form of the word in the string.
#
# If passed an optional +locale+ parameter, the word will be
# pluralized using rules defined for that language. By default,
# this parameter is set to <tt>:en</tt>.
#
# 'post'.pluralize # => "posts"
# 'octopus'.pluralize # => "octopi"
# 'sheep'.pluralize # => "sheep"
# 'words'.pluralize # => "words"
# 'CamelOctopus'.pluralize # => "CamelOctopi"
# 'ley'.pluralize(:es) # => "leyes"
def pluralize(word, locale = :en)
apply_inflections(word, inflections(locale).plurals)
end
memoize :pluralize
# The reverse of +pluralize+, returns the singular form of a word in a
# string.
#
# If passed an optional +locale+ parameter, the word will be
# pluralized using rules defined for that language. By default,
# this parameter is set to <tt>:en</tt>.
#
# 'posts'.singularize # => "post"
# 'octopi'.singularize # => "octopus"
# 'sheep'.singularize # => "sheep"
# 'word'.singularize # => "word"
# 'CamelOctopi'.singularize # => "CamelOctopus"
# 'leyes'.singularize(:es) # => "ley"
def singularize(word, locale = :en)
apply_inflections(word, inflections(locale).singulars)
end
memoize :singularize
# 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.
#
# 'active_model'.camelize # => "ActiveModel"
# 'active_model'.camelize(:lower) # => "activeModel"
# 'active_model/errors'.camelize # => "ActiveModel::Errors"
# 'active_model/errors'.camelize(:lower) # => "activeModel::Errors"
#
# As a rule of thumb you can think of +camelize+ as the inverse of
# +underscore+, though there are cases where that does not hold:
#
# 'SSLError'.underscore.camelize # => "SslError"
def camelize(term, uppercase_first_letter = true)
string = term.to_s
if uppercase_first_letter
string = string.sub(/^[a-z\d]*/) { inflections.acronyms[$&] || $&.capitalize }
else
string = string.sub(/^(?:#{inflections.acronym_regex}(?=\b|[A-Z_])|\w)/) { $&.downcase }
end
string.gsub(/(?:_|(\/))([a-z\d]*)/i) { "#{$1}#{inflections.acronyms[$2] || $2.capitalize}" }.gsub('/', '::')
end
memoize :camelize
# Makes an underscored, lowercase form from the expression in the string.
#
# Changes '::' to '/' to convert namespaces to paths.
#
# 'ActiveModel'.underscore # => "active_model"
# 'ActiveModel::Errors'.underscore # => "active_model/errors"
#
# As a rule of thumb you can think of +underscore+ as the inverse of
# +camelize+, though there are cases where that does not hold:
#
# 'SSLError'.underscore.camelize # => "SslError"
def underscore(camel_cased_word)
word = camel_cased_word.to_s.dup
word.gsub!('::', '/')
word.gsub!(/(?:([A-Za-z\d])|^)(#{inflections.acronym_regex})(?=\b|[^a-z])/) { "#{$1}#{$1 && '_'}#{$2.downcase}" }
word.gsub!(/([A-Z\d]+)([A-Z][a-z])/,'\1_\2')
word.gsub!(/([a-z\d])([A-Z])/,'\1_\2')
word.tr!("-", "_")
word.downcase!
word
end
memoize :underscore
# Capitalizes the first word and turns underscores into spaces and strips a
# trailing "_id", if any. Like +titleize+, this is meant for creating pretty
# output.
#
# 'employee_salary'.humanize # => "Employee salary"
# 'author_id'.humanize # => "Author"
def humanize(lower_case_and_underscored_word)
result = lower_case_and_underscored_word.to_s.dup
inflections.humans.each { |(rule, replacement)| break if result.sub!(rule, replacement) }
result.gsub!(/_id$/, "")
result.tr!('_', ' ')
result.gsub(/([a-z\d]*)/i) { |match|
"#{inflections.acronyms[match] || match.downcase}"
}.gsub(/^\w/) { $&.upcase }
end
memoize :humanize
# 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 +titlecase+.
#
# 'man from the boondocks'.titleize # => "Man From The Boondocks"
# 'x-men: the last stand'.titleize # => "X Men: The Last Stand"
# 'TheManWithoutAPast'.titleize # => "The Man Without A Past"
# 'raiders_of_the_lost_ark'.titleize # => "Raiders Of The Lost Ark"
def titleize(word)
humanize(underscore(word)).gsub(/\b(?<!['’`])[a-z]/) { $&.capitalize }
end
memoize :titleize
# 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.
#
# '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
memoize :tableize
# 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+).
#
# '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
memoize :classify
# Replaces underscores with dashes in the string.
#
# 'puni_puni'.dasherize # => "puni-puni"
def dasherize(underscored_word)
underscored_word.tr('_', '-')
end
memoize :dasherize
# Removes the module part from the expression in the string.
#
# 'ActiveRecord::CoreExtensions::String::Inflections'.demodulize # => "Inflections"
# 'Inflections'.demodulize # => "Inflections"
#
# See also +deconstantize+.
def demodulize(path)
path = path.to_s
if i = path.rindex('::')
path[(i+2)..-1]
else
path
end
end
memoize :demodulize
# Removes the rightmost segment from the constant expression in the string.
#
# 'Net::HTTP'.deconstantize # => "Net"
# '::Net::HTTP'.deconstantize # => "::Net"
# 'String'.deconstantize # => ""
# '::String'.deconstantize # => ""
# ''.deconstantize # => ""
#
# See also +demodulize+.
def deconstantize(path)
path.to_s[0...(path.rindex('::') || 0)] # implementation based on the one in facets' Module#spacename
end
memoize :deconstantize
# 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'.
#
# '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
memoize :foreign_key
# 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?
names.inject(Object) do |constant, name|
if constant == Object
constant.const_get(name)
else
candidate = constant.const_get(name)
next candidate if constant.const_defined?(name, false)
next candidate unless Object.const_defined?(name)
# Go down the ancestors to check it it's owned
# directly before we reach Object or the end of ancestors.
constant = constant.ancestors.inject do |const, ancestor|
break const if ancestor == Object
break ancestor if ancestor.const_defined?(name, false)
const
end
# owner is in Object, so raise
constant.const_get(name, false)
end
end
end
# Tries to find a constant with the name specified in the argument string.
#
# 'Module'.safe_constantize # => Module
# 'Test::Unit'.safe_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'.safe_constantize # => 'outside', same as ::C
# end
#
# +nil+ is returned when the name is not in CamelCase or the constant (or
# part of it) is unknown.
#
# 'blargle'.safe_constantize # => nil
# 'UnknownModule'.safe_constantize # => nil
# 'UnknownModule::Foo::Bar'.safe_constantize # => nil
def safe_constantize(camel_cased_word)
constantize(camel_cased_word)
rescue NameError => e
raise unless e.message =~ /(uninitialized constant|wrong constant name) #{const_regexp(camel_cased_word)}$/ ||
e.name.to_s == camel_cased_word.to_s
rescue ArgumentError => e
raise unless e.message =~ /not missing constant #{const_regexp(camel_cased_word)}\!$/
end
# Returns the suffix that should be added to a number to denote the position
# in an ordered sequence such as 1st, 2nd, 3rd, 4th.
#
# ordinal(1) # => "st"
# ordinal(2) # => "nd"
# ordinal(1002) # => "nd"
# ordinal(1003) # => "rd"
# ordinal(-11) # => "th"
# ordinal(-1021) # => "st"
def ordinal(number)
abs_number = number.to_i.abs
if (11..13).include?(abs_number % 100)
"th"
else
case abs_number % 10
when 1; "st"
when 2; "nd"
when 3; "rd"
else "th"
end
end
end
# Turns a number into an ordinal string used to denote the position in an
# ordered sequence such as 1st, 2nd, 3rd, 4th.
#
# ordinalize(1) # => "1st"
# ordinalize(2) # => "2nd"
# ordinalize(1002) # => "1002nd"
# ordinalize(1003) # => "1003rd"
# ordinalize(-11) # => "-11th"
# ordinalize(-1021) # => "-1021st"
def ordinalize(number)
"#{number}#{ordinal(number)}"
end
private
# Mount a regular expression that will match part by part of the constant.
# For instance, Foo::Bar::Baz will generate Foo(::Bar(::Baz)?)?
def const_regexp(camel_cased_word) #:nodoc:
parts = camel_cased_word.split("::")
last = parts.pop
parts.reverse.inject(last) do |acc, part|
part.empty? ? acc : "#{part}(::#{acc})?"
end
end
# Applies inflection rules for +singularize+ and +pluralize+.
#
# apply_inflections('post', inflections.plurals) # => "posts"
# apply_inflections('posts', inflections.singulars) # => "post"
def apply_inflections(word, rules)
result = word.to_s.dup
if word.empty? || inflections.uncountables.include?(result.downcase[/\b\w+\Z/])
result
else
rules.each { |(rule, replacement)| break if result.sub!(rule, replacement) }
result
end
end
end
end
Jump to Line
Something went wrong with that request. Please try again.