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rails--rails/actionview/lib/action_view.rb

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# frozen_string_literal: true
#--
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# Copyright (c) 2004-2021 David Heinemeier Hansson
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#++
require "active_support"
require "active_support/rails"
require "action_view/version"
module ActionView
extend ActiveSupport::Autoload
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ENCODING_FLAG = '#.*coding[:=]\s*(\S+)[ \t]*'
eager_autoload do
autoload :Base
autoload :Context
autoload :Digestor
autoload :Helpers
autoload :LookupContext
autoload :Layouts
autoload :PathSet
autoload :RecordIdentifier
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autoload :Rendering
autoload :RoutingUrlFor
autoload :Template
autoload :UnboundTemplate
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autoload :ViewPaths
autoload_under "renderer" do
autoload :Renderer
autoload :AbstractRenderer
autoload :PartialRenderer
autoload :CollectionRenderer
autoload :ObjectRenderer
autoload :TemplateRenderer
autoload :StreamingTemplateRenderer
end
autoload_at "action_view/template/resolver" do
autoload :Resolver
Don't require "action_view/base" in action pack: - ### Problem ActionPack requires "action_view/base" at boot time, this causes a variety of issue that I described in detail in #38024. There is no real reason to require av/base in the ActionDispatch::Debugexceptions class. ### Solution Like any other components (such as ActiveRecord, ActiveJob...), ActionView::Base shouldn't be loaded at boot time. Here are the two main changes needed for this: 1) Actionview has a special initializer that needs to run before the app is fully booted (adding a executor needs to be done before application is done booting) https://github.com/rails/rails/blob/63ec70e700e321b22e9baf2ad2d45cd3f4febc79/actionview/lib/action_view/railtie.rb#L81-L84 That initializer used a lazy load hooks but we can't do that anymore because Action::Base view won't be triggered during booting process. When it will get triggered, (presumably on the first request), it's too late to add an executor. ------------------------------------------------ 2) Compare to other components, ActionView doesn't use `Base` for configuration flag. A lot of flags ares instead set on modules (FormHelper, FormTagHelper). The problem is that those module depends on AV::Base to be loaded, as otherwise configuration set by the user aren't applied. (Since the lazy load hooks hasn't been triggered) https://github.com/rails/rails/blob/63ec70e700e321b22e9baf2ad2d45cd3f4febc79/actionview/lib/action_view/railtie.rb#L66-L69 We shouldn't wait for AB::Base to be loaded in order to set these configuration. However, we need to do it inside an `after_initialize` block in order to let application set it to the value they want. Closes #28538 Co-authored-by: betesh <iybetesh@gmail.com>"
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autoload :FileSystemResolver
end
autoload_at "action_view/buffers" do
autoload :OutputBuffer
autoload :StreamingBuffer
end
autoload_at "action_view/flows" do
autoload :OutputFlow
autoload :StreamingFlow
end
autoload_at "action_view/template/error" do
autoload :MissingTemplate
autoload :ActionViewError
autoload :EncodingError
autoload :TemplateError
autoload :SyntaxErrorInTemplate
autoload :WrongEncodingError
end
end
autoload :CacheExpiry
autoload :TestCase
def self.eager_load!
super
ActionView::Helpers.eager_load!
ActionView::Template.eager_load!
end
end
require "active_support/core_ext/string/output_safety"
ActiveSupport.on_load(:i18n) do
I18n.load_path << File.expand_path("action_view/locale/en.yml", __dir__)
end