Module: Origen::Loader

Defined in:
lib/origen/loader.rb

Overview

This module is responsible for enhancing how Ruby requires and loads files to support loading of classes and modules from an application’s app dir without having to require them.

It also implements the <model>.load_block method that loads files from app/blocks.

Defined Under Namespace

Modules: ModuleConstMissing

Class Method Summary collapse

Class Method Details

._unload(path, name, children) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/origen/loader.rb', line 25

def self._unload(path, name, children)
  path << name
  children.each do |name, children|
    _unload(path, name, children)
  end
  const = path.join('::')
  if @loaded_consts[const]
    path[0...-1].join('::').constantize.send :remove_const, path.last
    # puts "******** Unloading: #{const}"
  end
  path.pop
end

.disable_origen_load_extensions! ⇒ Object 



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# File 'lib/origen/loader.rb', line 375

def self.disable_origen_load_extensions!
  ModuleConstMissing.exclude_from(Module)
end

.enable_origen_load_extensions! ⇒ Object 



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# File 'lib/origen/loader.rb', line 371

def self.enable_origen_load_extensions!
  Module.class_eval { include ModuleConstMissing }
end

.load_attributes(file, model) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/origen/loader.rb', line 56

def self.load_attributes(file, model)
  if model.respond_to?(:is_an_origen_model?)
    attributes = model.attributes.dup
  else
    attributes = {}
  end
  vars = model.instance_variables
  if load_block_file(file, model)
    # Update the value of any pre-existing attribute that could have just changed
    attributes.each do |a, v|
      attributes[a] = model.instance_variable_get("@#{a}")
    end
    # And add any new ones that were encountered for the first time
    (model.instance_variables - vars).each do |var|
      val = model.instance_variable_get(var)
      attribute = var.to_s.sub('@', '')
      attributes[attribute.to_sym] = val
      unless model.respond_to?(attribute)
        model.define_singleton_method(attribute) do
          instance_variable_get(var)
        end
      end
      if val == true || val == false
        attribute += '?'
        unless model.respond_to?(attribute)
          model.define_singleton_method(attribute) do
            instance_variable_get(var)
          end
        end
      end
    end
    if model.respond_to?(:is_an_origen_model?)
      attributes.freeze
      model.instance_variable_set(:@attributes, attributes)
    end
    true
  end
end

.load_block(model, options = {}) ⇒ Object

If a block definition exists for the given model, then this will load it and apply it to the model. Returns true if a model is found and loaded, otherwise nil.



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# File 'lib/origen/loader.rb', line 120

def self.load_block(model, options = {})
  model = model.model  # Ensure we have a handle on the model and not its controller
  loaded = nil
  if app = options[:app] || model.app
    if options[:path]
      full_paths = Array(options[:path])
    else
      full_paths = model.class.to_s.split('::')
      full_paths.shift  # Throw away the app namespace
      full_paths = [full_paths.join('/')]
    end
    full_paths.each do |full_path|
      paths = full_path.to_s.split('/')
      key = ''
      only = Array(options[:only]) if options[:only]
      except = Array(options[:except]) if options[:except]
      path = paths.map(&:underscore).join('/')
      # If the path refers to a nested sub-block then don't load the full hierarchy since they
      # don't support inheritance or derivatives, modify the paths array so that only the sub-block
      # level will be loaded and nothing else.
      paths = [path] if app.blocks_files[path] && app.blocks_files[path][:_sub_block]
      # These will be loaded first, followed by the rest in an undefined order.
      # Attributes and parameters are first so that they may be referenced in the other files.
      # Sub-blocks was added early due to a corner case issue that could be encountered if the pins or
      # regs imported an Origen exported file that defined a module with the same name as a sub-block
      # class, in that case the sub-block class would not be auto-loaded.
      load_first = [:attributes, :parameters, :sub_blocks]

      load_first.each do |type|
        unless (only && !only.include?(type)) || (except && except.include?(type))
          with_parameters_transaction(type) do
            paths.each_with_index do |path, i|
              key = i == 0 ? path.underscore : "#{key}/#{path.underscore}"
              if app.blocks_files[key] && app.blocks_files[key][type]
                app.blocks_files[key][type].each do |f|
                  if type == :attributes
                    success = load_attributes(f, model)
                  else
                    success = load_block_file(f, model)
                  end
                  loaded ||= success
                end
              end
            end
          end
        end
      end

      # Now load the rest
      paths.each_with_index do |path, i|
        key = i == 0 ? path.underscore : "#{key}/#{path.underscore}"
        if app.blocks_files[key]
          app.blocks_files[key].each do |type, files|
            unless type == :_sub_block || load_first.include?(type) || (only && !only.include?(type)) || (except && except.include?(type))
              files.each { |f| success = load_block_file(f, model); loaded ||= success }
            end
          end
        end
      end
    end
  end
  loaded
end

.load_block_file(file, model) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/origen/loader.rb', line 96

def self.load_block_file(file, model)
  file = file.to_s
  if File.exist?(file)
    File.open(file, 'r') do |f|
      model.instance_eval(f.read, file)
    end
  end
  true
end

.record_const(name) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/origen/loader.rb', line 39

def self.record_const(name)
  @consts_hierarchy ||= {}
  @loaded_consts ||= {}
  @loaded_consts[name] = true
  pointer = nil
  name.split('::').each do |name|
    if pointer
      pointer[name] ||= {}
      pointer = pointer[name]
    else
      @consts_hierarchy[name] ||= {}
      pointer = @consts_hierarchy[name]
    end
  end
end

.unload ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Unload all constants (classes and modules) that have been auto-loaded since this was last called



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# File 'lib/origen/loader.rb', line 10

def self.unload
  # puts "******** LOADED CONSTS@ #{@loaded_consts}"
  path = []
  (@consts_hierarchy || {}).each do |name, children|
    _unload(path, name, children)
  end
  @consts_hierarchy = {}
  @loaded_consts = {}
  (Origen.app.plugins + [Origen.app]).each do |app|
    app.instance_variable_set(:@blocks_files, nil)
  end
  nil
end

.with_parameters_transaction(type) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/origen/loader.rb', line 107

def self.with_parameters_transaction(type)
  if type == :parameters
    Origen::Parameters.transaction do
      yield
    end
  else
    yield
  end
end