Class: Compony::Component

Inherits:
Object
  • Object
show all
Defined in:
lib/compony/component.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(parent_comp = nil, index: 0, **comp_opts) ⇒ Component

Returns a new instance of Component.



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# File 'lib/compony/component.rb', line 33

def initialize(parent_comp = nil, index: 0, **comp_opts)
  @parent_comp = parent_comp
  @sub_comps = []
  @index = index
  @comp_opts = comp_opts
  @before_render_blocks = NaturalOrdering.new
  @content_blocks = NaturalOrdering.new
  @actions = NaturalOrdering.new
  @exposed_intent_blocks = []
  @skipped_actions = Set.new
  @path_block = proc do |model = nil, *args_for_path_helper, standalone_name: nil, **kwargs_for_path_helper|
    kwargs_for_path_helper.merge!(id: model.id) if model
    next Rails.application.routes.url_helpers.send(
      "#{path_helper_name(standalone_name)}_path",
      *args_for_path_helper,
      **kwargs_for_path_helper
    )
  end

  init_standalone
  init_labelling

  fail "#{inspect} is missing a call to `setup`." unless setup_blocks&.any?

  setup_blocks.each do |setup_block|
    instance_exec(&setup_block)
  end
end

Instance Attribute Details

#comp_opts ⇒ Object (readonly) 



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# File 'lib/compony/component.rb', line 9

def comp_opts
  @comp_opts
end

#content_blocks ⇒ Object (readonly)

needed in RequestContext for nesting



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# File 'lib/compony/component.rb', line 10

def content_blocks
  @content_blocks
end

#parent_comp ⇒ Object (readonly) 



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# File 'lib/compony/component.rb', line 8

def parent_comp
  @parent_comp
end

Class Method Details

.comp_name ⇒ Object

Returns the component name



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# File 'lib/compony/component.rb', line 29

def self.comp_name
  name.demodulize.underscore
end

.family_name ⇒ Object

Returns the family name



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# File 'lib/compony/component.rb', line 24

def self.family_name
  module_parent.to_s.demodulize.underscore
end

.setup(&block) ⇒ Object

DSL method



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# File 'lib/compony/component.rb', line 16

def self.setup(&block)
  fail("`setup` expects a block in #{inspect}.") unless block_given?
  self.setup_blocks ||= []
  self.setup_blocks = setup_blocks.dup # This is required to prevent the parent class to see children's setup blocks.
  setup_blocks << block
end

Instance Method Details

#before_render(name = :main, before: nil, &block) ⇒ Object

DSL method Adds or overrides a before_render block. You can use controller.redirect_to to redirect away and halt the before_render/content chain

Parameters:

  • name (Symbol, String) (defaults to: :main) —

    The name of the before_render block, defaults to :main

  • before (nil, Symbol, String) (defaults to: nil) —

    If nil, the block will be added to the bottom of the before_render chain. Otherwise, pass the name of another block.

  • block (Proc) —

    The block that should be run as part of the before_render pipeline. Will run in the component's context.



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# File 'lib/compony/component.rb', line 141

def before_render(name = :main, before: nil, **, &block)
  fail("`before_render` expects a block in #{inspect}.") unless block_given?
  @before_render_blocks.natural_push(name, block, before:, **)
end

#content(name = :main, before: nil, &block) ⇒ Object

DSL method Adds or overrides a content block.

Parameters:

  • name (Symbol, String) (defaults to: :main) —

    The name of the content block, defaults to :main

  • before (nil, Symbol, String) (defaults to: nil) —

    If nil, the block will be added to the bottom of the content chain. Otherwise, pass the name of another block.

  • kwargs (Hash) —

    If hidden is true, the content will not be rendered by default, allowing you to nest it in another content block.

  • block (Proc) —

    The block that should be run as part of the content pipeline. Will run in the component's context. You can use Dyny here.



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# File 'lib/compony/component.rb', line 152

def content(name = :main, before: nil, **, &block)
  # A block is required here, but if this is an override (e.g. to hide another content block), we can tolerate the missing block.
  if !block_given? && @content_blocks.find { |b| b.name == name }.nil?
    fail("`content` expects a block in #{inspect}.")
  end
  @content_blocks.natural_push(name, block || :missing, before:, **)
end

#exposed_intents(&block) ⇒ Object

DSL method If a block is given: Enters the DSL where exposed intents can be added or removed (use from setup within the component). If no block is given: Builds the declared intents and returns them (use from a RequestContest outside the component).



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# File 'lib/compony/component.rb', line 218

def exposed_intents(&block)
  if block_given?
    # Enter DSL
    @exposed_intent_blocks << block
  else
    # Build the declared intents
    return @exposed_intents if @exposed_intents
    @exposed_intents = NaturalOrdering.new
    @exposed_intent_blocks.each { |block| ManageIntentsDsl.new(@exposed_intents).evaluate(&block) } # alters @exposed_intents
    return @exposed_intents.map!(&:payload)
  end
end

#id ⇒ Object

Returns an identifier describing this component. Must be unique among simplings under the same parent_comp. Do not override.



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# File 'lib/compony/component.rb', line 81

def id
  "#{family_name}_#{comp_name}_#{@index}"
end

#id_path ⇒ Object

Returns the id_path from the root_comp. Do not overwrite.



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# File 'lib/compony/component.rb', line 87

def id_path
  if root_comp?
    id
  else
    "#{parent_comp.id_path}/#{id}"
  end
end

#id_path_hash ⇒ Object

Returns a hash for the id_path. Used for params prefixing. Do not overwrite.



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# File 'lib/compony/component.rb', line 97

def id_path_hash
  Digest::SHA1.hexdigest(id_path)[..4]
end

#inspect ⇒ Object 



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# File 'lib/compony/component.rb', line 62

def inspect
  "#<#{self.class.name}:#{hash}>"
end

#param_name(unprefixed_param_name) ⇒ Object

Given an unprefixed name of a param, adds the id_path hash Do not overwrite.



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# File 'lib/compony/component.rb', line 103

def param_name(unprefixed_param_name)
  "#{id_path_hash}_#{unprefixed_param_name}"
end

#path(&block) ⇒ Object

DSL method Overrides how the path to this component should be generated. The block will be given the following args: a model (optional), pos. args for the path helper, the kwarg standalone_name and kwargs for the path helper. The block is expected to return a Rails path. It is not given controller or helpers, instead use: Rails.application.routes.url_helpers. For an example, refer to the initializer of this class, where the default block is defined.



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# File 'lib/compony/component.rb', line 126

def path(*, **, &block)
  if block_given?
    # Assignment via DSL
    @path_block = block
  else
    @path_block.call(*, **)
  end
end

#remove_content(name) ⇒ Object

DSL method Removes a content block. Use this in subclasses if a content block defined in the parent should be removed from the child.

Parameters:

  • name (Symbol, String) —

    Name of the content block that should be removed



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# File 'lib/compony/component.rb', line 163

def remove_content(name) # rubocop:disable Naming/PredicateMethod
  existing_index = @content_blocks.find_index { |el| el.name == name.to_sym }
  if existing_index.nil?
    return false
  else
    @content_blocks.delete_at(existing_index)
    return true
  end
end

#remove_content!(name) ⇒ Object

DSL method Removes a content block and fails if the content block was not found.

Parameters:

  • name (Symbol, String) —

    Name of the content block that should be removed



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# File 'lib/compony/component.rb', line 176

def remove_content!(name)
  remove_content(name) || fail("Content block #{name.inspect} not found for removal in #{inspect}.")
end

#render(controller, standalone: false, **locals) ⇒ Object

Renders the component using the controller passsed to it and returns it as a string. Do not overwrite.

Parameters:

  • standalone (Boolean) (defaults to: false) —

    pass true iff render is called from render_standalone



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# File 'lib/compony/component.rb', line 183

def render(controller, standalone: false, **locals)
  # Call before_render hooks (if any) and backfire instance variables back to the component
  @before_render_blocks.each do |element|
    RequestContext.new(self, controller, locals:).evaluate_with_backfire(&element.payload)
    # Stop if a `before_render` block issued a body (e.g. through redirecting)
    break unless controller.response_body.nil?
  end

  # Render, unless before_render has already issued a body (e.g. through redirecting).
  if controller.response_body.nil?
    fail "#{self.class.inspect} must define `content` or set a response body in `before_render`" if @content_blocks.none?
    return controller.render_to_string(
      type:   :dyny,
      locals: { content_blocks: @content_blocks, standalone:, component: self, render_locals: locals },
      inline: <<~RUBY
        if Compony.content_before_root_comp_block && standalone
          Compony::RequestContext.new(component, controller, helpers: self, locals: render_locals).evaluate(&Compony.content_before_root_comp_block)
        end
        content_blocks.reject{ |el| el.hidden }.each do |element|
          # Instanciate and evaluate a fresh RequestContext in order to use the buffer allocated by the ActionView (needed for `concat` calls)
          Compony::RequestContext.new(component, controller, helpers: self, locals: render_locals).evaluate(&element.payload)
        end
        if Compony.content_after_root_comp_block && standalone
          Compony::RequestContext.new(component, controller, helpers: self, locals: render_locals).evaluate(&Compony.content_after_root_comp_block)
        end
      RUBY
    )
  else
    return nil # Prevent double render errors
  end
end

#resourceful? ⇒ Boolean

Is true for resourceful components

Returns:

  • (Boolean) 


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# File 'lib/compony/component.rb', line 232

def resourceful?
  return false
end

#root_comp ⇒ Object

Returns the current root comp. Do not overwrite.



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# File 'lib/compony/component.rb', line 68

def root_comp
  return self unless parent_comp
  return parent_comp.root_comp
end

#root_comp? ⇒ Boolean

Returns whether or not this is the root comp. Do not overwrite.

Returns:

  • (Boolean) 


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# File 'lib/compony/component.rb', line 75

def root_comp?
  parent_comp.nil?
end

#sub_comp(**comp_opts) ⇒ Object

Instanciate a component with self as a parent



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# File 'lib/compony/component.rb', line 108

def sub_comp(*, **comp_opts)
  intent = Compony.intent(*)
  sub = intent.comp(self, index: @sub_comps.count, **comp_opts)
  @sub_comps << sub
  return sub
end