/usr/lib/ruby/vendor_ruby/abstract_controller/helpers.rb is in ruby-actionpack 2:4.2.6-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 | require 'active_support/dependencies'
module AbstractController
module Helpers
extend ActiveSupport::Concern
included do
class_attribute :_helpers
self._helpers = Module.new
class_attribute :_helper_methods
self._helper_methods = Array.new
end
class MissingHelperError < LoadError
def initialize(error, path)
@error = error
@path = "helpers/#{path}.rb"
set_backtrace error.backtrace
if error.path =~ /^#{path}(\.rb)?$/
super("Missing helper file helpers/%s.rb" % path)
else
raise error
end
end
end
module ClassMethods
# When a class is inherited, wrap its helper module in a new module.
# This ensures that the parent class's module can be changed
# independently of the child class's.
def inherited(klass)
helpers = _helpers
klass._helpers = Module.new { include helpers }
klass.class_eval { default_helper_module! } unless klass.anonymous?
super
end
# Declare a controller method as a helper. For example, the following
# makes the +current_user+ controller method available to the view:
# class ApplicationController < ActionController::Base
# helper_method :current_user, :logged_in?
#
# def current_user
# @current_user ||= User.find_by(id: session[:user])
# end
#
# def logged_in?
# current_user != nil
# end
# end
#
# In a view:
# <% if logged_in? -%>Welcome, <%= current_user.name %><% end -%>
#
# ==== Parameters
# * <tt>method[, method]</tt> - A name or names of a method on the controller
# to be made available on the view.
def helper_method(*meths)
meths.flatten!
self._helper_methods += meths
meths.each do |meth|
_helpers.class_eval <<-ruby_eval, __FILE__, __LINE__ + 1
def #{meth}(*args, &blk) # def current_user(*args, &blk)
controller.send(%(#{meth}), *args, &blk) # controller.send(:current_user, *args, &blk)
end # end
ruby_eval
end
end
# The +helper+ class method can take a series of helper module names, a block, or both.
#
# ==== Options
# * <tt>*args</tt> - Module, Symbol, String
# * <tt>block</tt> - A block defining helper methods
#
# When the argument is a module it will be included directly in the template class.
# helper FooHelper # => includes FooHelper
#
# When the argument is a string or symbol, the method will provide the "_helper" suffix, require the file
# and include the module in the template class. The second form illustrates how to include custom helpers
# when working with namespaced controllers, or other cases where the file containing the helper definition is not
# in one of Rails' standard load paths:
# helper :foo # => requires 'foo_helper' and includes FooHelper
# helper 'resources/foo' # => requires 'resources/foo_helper' and includes Resources::FooHelper
#
# Additionally, the +helper+ class method can receive and evaluate a block, making the methods defined available
# to the template.
#
# # One line
# helper { def hello() "Hello, world!" end }
#
# # Multi-line
# helper do
# def foo(bar)
# "#{bar} is the very best"
# end
# end
#
# Finally, all the above styles can be mixed together, and the +helper+ method can be invoked with a mix of
# +symbols+, +strings+, +modules+ and blocks.
#
# helper(:three, BlindHelper) { def mice() 'mice' end }
#
def helper(*args, &block)
modules_for_helpers(args).each do |mod|
add_template_helper(mod)
end
_helpers.module_eval(&block) if block_given?
end
# Clears up all existing helpers in this class, only keeping the helper
# with the same name as this class.
def clear_helpers
inherited_helper_methods = _helper_methods
self._helpers = Module.new
self._helper_methods = Array.new
inherited_helper_methods.each { |meth| helper_method meth }
default_helper_module! unless anonymous?
end
# Returns a list of modules, normalized from the acceptable kinds of
# helpers with the following behavior:
#
# String or Symbol:: :FooBar or "FooBar" becomes "foo_bar_helper",
# and "foo_bar_helper.rb" is loaded using require_dependency.
#
# Module:: No further processing
#
# After loading the appropriate files, the corresponding modules
# are returned.
#
# ==== Parameters
# * <tt>args</tt> - An array of helpers
#
# ==== Returns
# * <tt>Array</tt> - A normalized list of modules for the list of
# helpers provided.
def modules_for_helpers(args)
args.flatten.map! do |arg|
case arg
when String, Symbol
file_name = "#{arg.to_s.underscore}_helper"
begin
require_dependency(file_name)
rescue LoadError => e
raise AbstractController::Helpers::MissingHelperError.new(e, file_name)
end
mod_name = file_name.camelize
begin
mod_name.constantize
rescue LoadError
# dependencies.rb gives a similar error message but its wording is
# not as clear because it mentions autoloading. To the user all it
# matters is that a helper module couldn't be loaded, autoloading
# is an internal mechanism that should not leak.
raise NameError, "Couldn't find #{mod_name}, expected it to be defined in helpers/#{file_name}.rb"
end
when Module
arg
else
raise ArgumentError, "helper must be a String, Symbol, or Module"
end
end
end
private
# Makes all the (instance) methods in the helper module available to templates
# rendered through this controller.
#
# ==== Parameters
# * <tt>module</tt> - The module to include into the current helper module
# for the class
def add_template_helper(mod)
_helpers.module_eval { include mod }
end
def default_helper_module!
module_name = name.sub(/Controller$/, '')
module_path = module_name.underscore
helper module_path
rescue MissingSourceFile => e
raise e unless e.is_missing? "helpers/#{module_path}_helper"
rescue NameError => e
raise e unless e.missing_name? "#{module_name}Helper"
end
end
end
end
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