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Diffstat (limited to 'activesupport/lib/active_support/inflector/inflections.rb')
-rw-r--r-- | activesupport/lib/active_support/inflector/inflections.rb | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/inflector/inflections.rb b/activesupport/lib/active_support/inflector/inflections.rb new file mode 100644 index 0000000000..24ce58e5c2 --- /dev/null +++ b/activesupport/lib/active_support/inflector/inflections.rb @@ -0,0 +1,213 @@ +# require "active_support/core_ext/string/access" + +module ActiveSupport + module Inflector + # 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 + + # 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 + + # 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 + + # 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 + end +end
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