Class: Bytemapper::Registry

Inherits:
Object
  • Object
show all
Defined in:
lib/bytemapper/registry.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(with_basic_types = true) ⇒ Registry

Returns a new instance of Registry.



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# File 'lib/bytemapper/registry.rb', line 24

def initialize(with_basic_types = true)
  @objects = {}
  @names = {}
  register_basic_types unless with_basic_types == false
end

Instance Attribute Details

#names ⇒ Object (readonly)

Returns the value of attribute names.



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# File 'lib/bytemapper/registry.rb', line 21

def names
  @names
end

#objects ⇒ Object (readonly)

Returns the value of attribute objects.



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# File 'lib/bytemapper/registry.rb', line 22

def objects
  @objects
end

Instance Method Details

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/bytemapper/registry.rb', line 30

def empty?
  @objects.size.zero? && @names.size.zero?
end

#flush ⇒ Object 



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# File 'lib/bytemapper/registry.rb', line 34

def flush
  @objects = {}
  @names = {}
end

#get(obj) ⇒ Object 



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# File 'lib/bytemapper/registry.rb', line 44

def get(obj)
  if registered_name?(obj)
    obj = obj.to_sym.downcase
    @objects.fetch(@names[obj]) unless obj.nil?
  elsif registered_obj?(obj)
    @objects.fetch(obj.hash)
  else
    nil
  end
end

#print ⇒ Object 



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# File 'lib/bytemapper/registry.rb', line 97

def print
  puts to_s
end

#put(obj, name = nil) ⇒ Object 



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# File 'lib/bytemapper/registry.rb', line 55

def put(obj, name = nil)
  obj = register_obj(obj)
  register_name(obj, name) unless name.nil?
  obj
end

#register_name(obj, name) ⇒ Object Also known as: register_alias 



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# File 'lib/bytemapper/registry.rb', line 85

def register_name(obj, name)
  if registered_name?(name) && get(name) != obj
    raise ArgumentError.new 'Name is already registered'
  else
    name = name.to_sym.downcase
    @names[name] ||= obj.hash
    obj.names << name if obj.respond_to?(:names)
  end
  obj
end

#register_obj(obj) ⇒ Object 



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# File 'lib/bytemapper/registry.rb', line 74

def register_obj(obj)
  unless registered_obj?(obj)
    begin
      obj.extend(Nameable)
      obj.names = Set.new
    rescue TypeError
    end
  end
  @objects[obj.hash] ||= obj
end

#registered?(obj) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/bytemapper/registry.rb', line 39

def registered?(obj)
  v = registered_name?(obj) if obj.respond_to?(:to_sym)
  v || registered_obj?(obj)
end

#registered_name?(name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/bytemapper/registry.rb', line 61

def registered_name?(name)
  if name.respond_to?(:to_sym)
    name = name.to_sym.downcase
    @names.key?(name)
  else
    false
  end
end

#registered_obj?(obj) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/bytemapper/registry.rb', line 70

def registered_obj?(obj)
  @objects.key?(obj.hash)
end

#reset(with_basic_types = true) ⇒ Object 



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# File 'lib/bytemapper/registry.rb', line 176

def reset(with_basic_types = true)
  flush
  register_basic_types unless with_basic_types == false
end

#to_s ⇒ Object 



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# File 'lib/bytemapper/registry.rb', line 101

def to_s
  return "" if @objects.empty?

  # Buffer to build up output.
  buf = StringIO.new

  # Calculate the true max width of each column.
  widths = [
    @names.keys.size.zero? ? 0 : @names.keys.map(&:size).max + 1, # add space for the `:`
    7, # length of ID to print
    @objects.values.map { |o| o.class.to_s.size }.max,
    @objects.values.map { |v| v.to_s.size }.max
  ]

  # Truncate more than `max_width` num chars
  max_width = 60
  widths = widths.map { |w| w > max_width ? max_width : w }

  # Add an extra space at the beginning and end of each column.
  widths = widths.map { |p| p += 2 }

  buf << "+"
  # Build the header line.
  widths.each do |w|
    buf << "#{'-' * w}+"
  end
  buf << "\n"

  # Build the rows of the table.
  @objects.each do |id, obj|
    names = @names.filter { |k,v| v == id }.keys
    names << '' if names.empty?
    # Create an entry for each object alias.
    names.each do |name|
      buf << "|"

      # Fixup the id string so it pads nicely
      idstr = id.positive? ? id.to_s[..5] : id.to_s[..6]
      idstr = id.positive? ? " #{idstr}" : "#{idstr}"

      # Generate the column values
      values = [
        name.empty? ? name : ":#{name}",
        idstr,
        "#{obj.class.to_s}",
        "#{obj.to_s}"
      ]

      # Pad the values to fit in their respective columns, truncating as
      # needed to stay within `max_width`
      values = widths.zip(values).map do |w,v|
        q = w - v.size
        if q < 2
          " #{v[..w-7]} ... "
        else
          " #{v}#{" "*(q-1)}"
        end
      end

      values.size.times do |i|
        buf << "#{values[i]}|"
      end
      buf << "\n"
    end
  end

  # Build the trailing line.
  buf << "+"
  widths.each do |w|
    buf << "#{'-' * w}+"
  end
  buf << "\n"
  buf.string
end