mirror of
https://github.com/rails/rails.git
synced 2022-11-09 12:12:34 -05:00
11e05defec
In the following situation:
```ruby
class Bar
end
module Baz
end
class Foo
prepend Baz
end
class Foo::Bar
end
```
Running `Inflector.constantize('Foo::Bar')` would blow up with a NameError.
What is happening is that `constatize` was written before the introduction
of prepend, and wrongly assume that `klass.ancestors.first == klass`.
So it uses `klass.ancestors.inject` without arguments, as a result
a prepended module is used in place of the actual class.
391 lines
15 KiB
Ruby
391 lines
15 KiB
Ruby
require "active_support/inflections"
|
||
require "active_support/core_ext/regexp"
|
||
|
||
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>.
|
||
#
|
||
# pluralize('post') # => "posts"
|
||
# pluralize('octopus') # => "octopi"
|
||
# pluralize('sheep') # => "sheep"
|
||
# pluralize('words') # => "words"
|
||
# pluralize('CamelOctopus') # => "CamelOctopi"
|
||
# pluralize('ley', :es) # => "leyes"
|
||
def pluralize(word, locale = :en)
|
||
apply_inflections(word, inflections(locale).plurals)
|
||
end
|
||
|
||
# The reverse of #pluralize, returns the singular form of a word in a
|
||
# string.
|
||
#
|
||
# If passed an optional +locale+ parameter, the word will be
|
||
# singularized using rules defined for that language. By default,
|
||
# this parameter is set to <tt>:en</tt>.
|
||
#
|
||
# singularize('posts') # => "post"
|
||
# singularize('octopi') # => "octopus"
|
||
# singularize('sheep') # => "sheep"
|
||
# singularize('word') # => "word"
|
||
# singularize('CamelOctopi') # => "CamelOctopus"
|
||
# singularize('leyes', :es) # => "ley"
|
||
def singularize(word, locale = :en)
|
||
apply_inflections(word, inflections(locale).singulars)
|
||
end
|
||
|
||
# Converts strings to UpperCamelCase.
|
||
# If the +uppercase_first_letter+ parameter is set to false, then produces
|
||
# lowerCamelCase.
|
||
#
|
||
# Also converts '/' to '::' which is useful for converting
|
||
# paths to namespaces.
|
||
#
|
||
# camelize('active_model') # => "ActiveModel"
|
||
# camelize('active_model', false) # => "activeModel"
|
||
# camelize('active_model/errors') # => "ActiveModel::Errors"
|
||
# camelize('active_model/errors', false) # => "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:
|
||
#
|
||
# camelize(underscore('SSLError')) # => "SslError"
|
||
def camelize(term, uppercase_first_letter = true)
|
||
string = term.to_s
|
||
if uppercase_first_letter
|
||
string = string.sub(/^[a-z\d]*/) { |match| inflections.acronyms[match] || match.capitalize }
|
||
else
|
||
string = string.sub(/^(?:#{inflections.acronym_regex}(?=\b|[A-Z_])|\w)/) { |match| match.downcase }
|
||
end
|
||
string.gsub!(/(?:_|(\/))([a-z\d]*)/i) { "#{$1}#{inflections.acronyms[$2] || $2.capitalize}" }
|
||
string.gsub!("/".freeze, "::".freeze)
|
||
string
|
||
end
|
||
|
||
# Makes an underscored, lowercase form from the expression in the string.
|
||
#
|
||
# Changes '::' to '/' to convert namespaces to paths.
|
||
#
|
||
# underscore('ActiveModel') # => "active_model"
|
||
# underscore('ActiveModel::Errors') # => "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:
|
||
#
|
||
# camelize(underscore('SSLError')) # => "SslError"
|
||
def underscore(camel_cased_word)
|
||
return camel_cased_word unless /[A-Z-]|::/.match?(camel_cased_word)
|
||
word = camel_cased_word.to_s.gsub("::".freeze, "/".freeze)
|
||
word.gsub!(/(?:(?<=([A-Za-z\d]))|\b)(#{inflections.acronym_regex})(?=\b|[^a-z])/) { "#{$1 && '_'.freeze }#{$2.downcase}" }
|
||
word.gsub!(/([A-Z\d]+)([A-Z][a-z])/, '\1_\2'.freeze)
|
||
word.gsub!(/([a-z\d])([A-Z])/, '\1_\2'.freeze)
|
||
word.tr!("-".freeze, "_".freeze)
|
||
word.downcase!
|
||
word
|
||
end
|
||
|
||
# Tweaks an attribute name for display to end users.
|
||
#
|
||
# Specifically, performs these transformations:
|
||
#
|
||
# * Applies human inflection rules to the argument.
|
||
# * Deletes leading underscores, if any.
|
||
# * Removes a "_id" suffix if present.
|
||
# * Replaces underscores with spaces, if any.
|
||
# * Downcases all words except acronyms.
|
||
# * Capitalizes the first word.
|
||
#
|
||
# The capitalization of the first word can be turned off by setting the
|
||
# +:capitalize+ option to false (default is true).
|
||
#
|
||
# humanize('employee_salary') # => "Employee salary"
|
||
# humanize('author_id') # => "Author"
|
||
# humanize('author_id', capitalize: false) # => "author"
|
||
# humanize('_id') # => "Id"
|
||
#
|
||
# If "SSL" was defined to be an acronym:
|
||
#
|
||
# humanize('ssl_error') # => "SSL error"
|
||
#
|
||
def humanize(lower_case_and_underscored_word, options = {})
|
||
result = lower_case_and_underscored_word.to_s.dup
|
||
|
||
inflections.humans.each { |(rule, replacement)| break if result.sub!(rule, replacement) }
|
||
|
||
result.sub!(/\A_+/, "".freeze)
|
||
result.sub!(/_id\z/, "".freeze)
|
||
result.tr!("_".freeze, " ".freeze)
|
||
|
||
result.gsub!(/([a-z\d]*)/i) do |match|
|
||
"#{inflections.acronyms[match] || match.downcase}"
|
||
end
|
||
|
||
if options.fetch(:capitalize, true)
|
||
result.sub!(/\A\w/) { |match| match.upcase }
|
||
end
|
||
|
||
result
|
||
end
|
||
|
||
# Converts just the first character to uppercase.
|
||
#
|
||
# upcase_first('what a Lovely Day') # => "What a Lovely Day"
|
||
# upcase_first('w') # => "W"
|
||
# upcase_first('') # => ""
|
||
def upcase_first(string)
|
||
string.length > 0 ? string[0].upcase.concat(string[1..-1]) : ""
|
||
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 +titlecase+.
|
||
#
|
||
# titleize('man from the boondocks') # => "Man From The Boondocks"
|
||
# titleize('x-men: the last stand') # => "X Men: The Last Stand"
|
||
# titleize('TheManWithoutAPast') # => "The Man Without A Past"
|
||
# titleize('raiders_of_the_lost_ark') # => "Raiders Of The Lost Ark"
|
||
def titleize(word)
|
||
humanize(underscore(word)).gsub(/\b(?<!['’`])[a-z]/) { |match| match.capitalize }
|
||
end
|
||
|
||
# Creates 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.
|
||
#
|
||
# tableize('RawScaledScorer') # => "raw_scaled_scorers"
|
||
# tableize('ham_and_egg') # => "ham_and_eggs"
|
||
# tableize('fancyCategory') # => "fancy_categories"
|
||
def tableize(class_name)
|
||
pluralize(underscore(class_name))
|
||
end
|
||
|
||
# Creates 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).
|
||
#
|
||
# classify('ham_and_eggs') # => "HamAndEgg"
|
||
# classify('posts') # => "Post"
|
||
#
|
||
# Singular names are not handled correctly:
|
||
#
|
||
# classify('calculus') # => "Calculus"
|
||
def classify(table_name)
|
||
# strip out any leading schema name
|
||
camelize(singularize(table_name.to_s.sub(/.*\./, "".freeze)))
|
||
end
|
||
|
||
# Replaces underscores with dashes in the string.
|
||
#
|
||
# dasherize('puni_puni') # => "puni-puni"
|
||
def dasherize(underscored_word)
|
||
underscored_word.tr("_".freeze, "-".freeze)
|
||
end
|
||
|
||
# Removes the module part from the expression in the string.
|
||
#
|
||
# demodulize('ActiveRecord::CoreExtensions::String::Inflections') # => "Inflections"
|
||
# demodulize('Inflections') # => "Inflections"
|
||
# demodulize('::Inflections') # => "Inflections"
|
||
# demodulize('') # => ""
|
||
#
|
||
# See also #deconstantize.
|
||
def demodulize(path)
|
||
path = path.to_s
|
||
if i = path.rindex("::")
|
||
path[(i + 2)..-1]
|
||
else
|
||
path
|
||
end
|
||
end
|
||
|
||
# Removes the rightmost segment from the constant expression in the string.
|
||
#
|
||
# deconstantize('Net::HTTP') # => "Net"
|
||
# deconstantize('::Net::HTTP') # => "::Net"
|
||
# deconstantize('String') # => ""
|
||
# deconstantize('::String') # => ""
|
||
# deconstantize('') # => ""
|
||
#
|
||
# See also #demodulize.
|
||
def deconstantize(path)
|
||
path.to_s[0, path.rindex("::") || 0] # implementation based on the one in facets' Module#spacename
|
||
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'.
|
||
#
|
||
# foreign_key('Message') # => "message_id"
|
||
# foreign_key('Message', false) # => "messageid"
|
||
# foreign_key('Admin::Post') # => "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
|
||
|
||
# Tries to find a constant with the name specified in the argument string.
|
||
#
|
||
# constantize('Module') # => Module
|
||
# constantize('Foo::Bar') # => Foo::Bar
|
||
#
|
||
# 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'
|
||
# constantize('C') # => '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("::".freeze)
|
||
|
||
# Trigger a built-in NameError exception including the ill-formed constant in the message.
|
||
Object.const_get(camel_cased_word) if names.empty?
|
||
|
||
# Remove the first blank element in case of '::ClassName' notation.
|
||
names.shift if names.size > 1 && 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 if it is owned directly. The check
|
||
# stops when we reach Object or the end of ancestors tree.
|
||
constant = constant.ancestors.inject(constant) 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.
|
||
#
|
||
# safe_constantize('Module') # => Module
|
||
# safe_constantize('Foo::Bar') # => Foo::Bar
|
||
#
|
||
# 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'
|
||
# safe_constantize('C') # => 'outside', same as ::C
|
||
# end
|
||
#
|
||
# +nil+ is returned when the name is not in CamelCase or the constant (or
|
||
# part of it) is unknown.
|
||
#
|
||
# safe_constantize('blargle') # => nil
|
||
# safe_constantize('UnknownModule') # => nil
|
||
# safe_constantize('UnknownModule::Foo::Bar') # => nil
|
||
def safe_constantize(camel_cased_word)
|
||
constantize(camel_cased_word)
|
||
rescue NameError => e
|
||
raise if e.name && !(camel_cased_word.to_s.split("::").include?(e.name.to_s) ||
|
||
e.name.to_s == camel_cased_word.to_s)
|
||
rescue ArgumentError => e
|
||
raise unless /not missing constant #{const_regexp(camel_cased_word)}!$/.match?(e.message)
|
||
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
|
||
|
||
# Mounts a regular expression, returned as a string to ease interpolation,
|
||
# that will match part by part the given constant.
|
||
#
|
||
# const_regexp("Foo::Bar::Baz") # => "Foo(::Bar(::Baz)?)?"
|
||
# const_regexp("::") # => "::"
|
||
def const_regexp(camel_cased_word) #:nodoc:
|
||
parts = camel_cased_word.split("::".freeze)
|
||
|
||
return Regexp.escape(camel_cased_word) if parts.blank?
|
||
|
||
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.uncountable?(result)
|
||
result
|
||
else
|
||
rules.each { |(rule, replacement)| break if result.sub!(rule, replacement) }
|
||
result
|
||
end
|
||
end
|
||
end
|
||
end
|