Class: ActionView::Template

Inherits:
Object show all
Extended by:
Handlers, ActiveSupport::Autoload
Defined in:
actionview/lib/action_view/template.rb,
actionview/lib/action_view/template/html.rb,
actionview/lib/action_view/template/text.rb,
actionview/lib/action_view/template/error.rb,
actionview/lib/action_view/template/types.rb,
actionview/lib/action_view/template/inline.rb,
actionview/lib/action_view/template/sources.rb,
actionview/lib/action_view/template/handlers.rb,
actionview/lib/action_view/template/raw_file.rb,
actionview/lib/action_view/template/renderable.rb,
actionview/lib/action_view/template/handlers/erb.rb,
actionview/lib/action_view/template/sources/file.rb,
actionview/lib/action_view/template/handlers/erb/erubi.rb

Overview

Action View Renderable Template for objects that respond to #render_in

Direct Known Subclasses

Inline

Defined Under Namespace

Modules: Handlers, Sources, Types Classes: Error, HTML, Inline, RawFile, Renderable, Text

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from ActiveSupport::Autoload

autoload, autoload_at, autoload_under, eager_autoload, eager_load!, extended

Methods included from Handlers

extended, extensions, handler_for_extension, register_default_template_handler, register_template_handler, registered_template_handler, template_handler_extensions, unregister_template_handler

Constructor Details

#initialize(source, identifier, handler, locals:, format: nil, variant: nil, virtual_path: nil) ⇒ Template

Returns a new instance of Template.


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# File 'actionview/lib/action_view/template.rb', line 123

def initialize(source, identifier, handler, locals:, format: nil, variant: nil, virtual_path: nil)
  @source            = source
  @identifier        = identifier
  @handler           = handler
  @compiled          = false
  @locals            = locals
  @virtual_path      = virtual_path

  @variable = if @virtual_path
    base = @virtual_path.end_with?("/") ? "" : ::File.basename(@virtual_path)
    base =~ /\A_?(.*?)(?:\.\w+)*\z/
    $1.to_sym
  end

  @format            = format
  @variant           = variant
  @compile_mutex     = Mutex.new
end

Instance Attribute Details

#formatObject (readonly)

Returns the value of attribute format.


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# File 'actionview/lib/action_view/template.rb', line 121

def format
  @format
end

#frozen_string_literalObject

Returns the value of attribute frozen_string_literal.


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# File 'actionview/lib/action_view/template.rb', line 117

def frozen_string_literal
  @frozen_string_literal
end

#handlerObject (readonly)

Returns the value of attribute handler.


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# File 'actionview/lib/action_view/template.rb', line 120

def handler
  @handler
end

#identifierObject (readonly)

Returns the value of attribute identifier.


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# File 'actionview/lib/action_view/template.rb', line 120

def identifier
  @identifier
end

#localsObject (readonly)

Returns the value of attribute locals.


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# File 'actionview/lib/action_view/template.rb', line 121

def locals
  @locals
end

#variableObject (readonly)

Returns the value of attribute variable.


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# File 'actionview/lib/action_view/template.rb', line 121

def variable
  @variable
end

#variantObject (readonly)

Returns the value of attribute variant.


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# File 'actionview/lib/action_view/template.rb', line 121

def variant
  @variant
end

#virtual_pathObject (readonly)

Returns the value of attribute virtual_path.


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# File 'actionview/lib/action_view/template.rb', line 121

def virtual_path
  @virtual_path
end

Instance Method Details

#encode!Object

This method is responsible for properly setting the encoding of the source. Until this point, we assume that the source is BINARY data. If no additional information is supplied, we assume the encoding is the same as Encoding.default_external.

The user can also specify the encoding via a comment on the first line of the template (# encoding: NAME-OF-ENCODING). This will work with any template engine, as we process out the encoding comment before passing the source on to the template engine, leaving a blank line in its stead.


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# File 'actionview/lib/action_view/template.rb', line 189

def encode!
  source = self.source

  return source unless source.encoding == Encoding::BINARY

  # Look for # encoding: *. If we find one, we'll encode the
  # String in that encoding, otherwise, we'll use the
  # default external encoding.
  if source.sub!(/\A#{ENCODING_FLAG}/, "")
    encoding = magic_encoding = $1
  else
    encoding = Encoding.default_external
  end

  # Tag the source with the default external encoding
  # or the encoding specified in the file
  source.force_encoding(encoding)

  # If the user didn't specify an encoding, and the handler
  # handles encodings, we simply pass the String as is to
  # the handler (with the default_external tag)
  if !magic_encoding && @handler.respond_to?(:handles_encoding?) && @handler.handles_encoding?
    source
  # Otherwise, if the String is valid in the encoding,
  # encode immediately to default_internal. This means
  # that if a handler doesn't handle encodings, it will
  # always get Strings in the default_internal
  elsif source.valid_encoding?
    source.encode!
  # Otherwise, since the String is invalid in the encoding
  # specified, raise an exception
  else
    raise WrongEncodingError.new(source, encoding)
  end
end

#inspectObject


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# File 'actionview/lib/action_view/template.rb', line 171

def inspect
  "#<#{self.class.name} #{short_identifier} locals=#{@locals.inspect}>"
end

#marshal_dumpObject

Exceptions are marshalled when using the parallel test runner with DRb, so we need to ensure that references to the template object can be marshalled as well. This means forgoing the marshalling of the compiler mutex and instantiating that again on unmarshalling.


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# File 'actionview/lib/action_view/template.rb', line 229

def marshal_dump # :nodoc:
  [ @source, @identifier, @handler, @compiled, @locals, @virtual_path, @format, @variant ]
end

#marshal_load(array) ⇒ Object

:nodoc:


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# File 'actionview/lib/action_view/template.rb', line 233

def marshal_load(array) # :nodoc:
  @source, @identifier, @handler, @compiled, @locals, @virtual_path, @format, @variant = *array
  @compile_mutex = Mutex.new
end

#render(view, locals, buffer = ActionView::OutputBuffer.new, add_to_stack: true, &block) ⇒ Object

Render a template. If the template was not compiled yet, it is done exactly before rendering.

This method is instrumented as “!render_template.action_view”. Notice that we use a bang in this instrumentation because you don't want to consume this in production. This is only slow if it's being listened to.


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# File 'actionview/lib/action_view/template.rb', line 154

def render(view, locals, buffer = ActionView::OutputBuffer.new, add_to_stack: true, &block)
  instrument_render_template do
    compile!(view)
    view._run(method_name, self, locals, buffer, add_to_stack: add_to_stack, &block)
  end
rescue => e
  handle_render_error(view, e)
end

#short_identifierObject


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# File 'actionview/lib/action_view/template.rb', line 167

def short_identifier
  @short_identifier ||= defined?(Rails.root) ? identifier.delete_prefix("#{Rails.root}/") : identifier
end

#sourceObject


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# File 'actionview/lib/action_view/template.rb', line 175

def source
  @source.to_s
end

#supports_streaming?Boolean

Returns whether the underlying handler supports streaming. If so, a streaming buffer may be passed when it starts rendering.

Returns:

  • (Boolean)

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# File 'actionview/lib/action_view/template.rb', line 144

def supports_streaming?
  handler.respond_to?(:supports_streaming?) && handler.supports_streaming?
end

#typeObject


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# File 'actionview/lib/action_view/template.rb', line 163

def type
  @type ||= Types[format]
end