Class: HackTree::ActionContext

Inherits:
Object
  • Object
show all
Defined in:
lib/hack_tree/action_context.rb

Overview

Context to execute the actions.

Instance Method Summary collapse

Constructor Details

#initialize(instance, parent = nil) ⇒ ActionContext

NOTE: No useless methods here, please.



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# File 'lib/hack_tree/action_context.rb', line 6

def initialize(instance, parent = nil)
  @instance, @parent = instance, parent

  # Suppress warnings.
  vrb, $VERBOSE = $VERBOSE, nil

  # Insert lookup routine for existing methods.
  (methods.map(&:to_s) - Node::FORBIDDEN_NAMES.map(&:to_s)).each do |method_name|
    next if not method_name =~ /\A(#{Node::NAME_REGEXP})\?{,1}\z/
    node_name = $1.to_sym
    instance_eval <<-EOT
      def #{method_name}(*args)
        if @instance.find_local_node(:#{node_name}, @parent)
          _dispatch(:#{method_name}, *args)
        else
          super
        end
      end
    EOT
  end

  # Restore warnings.
  $VERBOSE = vrb

  # Create direct methods. In case your console's completion is sane by itself, it will help.
  # IRB's default completion isn't sane yet (2012-02-25).
  @instance.nodes.select do |node|
    node.parent == @parent
  end.each do |node|
    # NOTE: This is slightly different from "existing method lookup routine" used above. Let's keep them separate.
    instance_eval <<-EOT
      def #{node.name}(*args)
        _dispatch(:#{node.name}, *args)
      end
    EOT
  end
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method_name, *args) ⇒ Object 



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# File 'lib/hack_tree/action_context.rb', line 85

def method_missing(method_name, *args)
  _dispatch(method_name.to_sym, *args)
end

Instance Method Details

#inspect ⇒ Object 



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# File 'lib/hack_tree/action_context.rb', line 44

def inspect
  # NOTES:
  #
  # * Exceptions raised here result in `(Object doesn't support #inspect)`. No other details are available, be careful.
  # * We don't return value from here, we **print** it directly.

  nodes = @instance.nodes.select {|node| node.parent == @parent}

  # Empty group?
  if nodes.empty?
    ::Kernel.puts "No groups/hacks here"
    return nil
  end

  # Not empty group, list contents.

  nodes = nodes.sort_by do |node|
    [
      node.is_a?(Node::Group) ? 0 : 1,    # Groups first.
      node.name.to_s,
    ]
  end

  # Compute name alignment width.
  names = nodes.map {|node| Tools.format_node_name(node)}
  name_align = Tools.compute_name_align(names, @instance.conf.local_name_align)

  nodes.each do |node|
    brief_desc = node.brief_desc || @instance.conf.brief_desc_stub

    fmt = "%-#{name_align}s%s"

    ::Kernel.puts(fmt % [
      Tools.format_node_name(node),
      brief_desc ? " # #{brief_desc}" : "",
    ])
  end # nodes.each

  nil
end