Class: Class

Inherits:
Object show all
Defined in:
lib/perennial/core_ext/misc.rb,
lib/perennial/core_ext/attribute_accessors.rb

Instance Method Summary collapse

Instance Method Details

#cattr_accessor(*syms) ⇒ Object 



70
71
72
73
 
# File 'lib/perennial/core_ext/attribute_accessors.rb', line 70

def cattr_accessor(*syms)
  cattr_reader(*syms)
  cattr_writer(*syms)
end

#cattr_reader(*syms) ⇒ Object 



30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
 
# File 'lib/perennial/core_ext/attribute_accessors.rb', line 30

def cattr_reader(*syms)
  syms.flatten.each do |sym|
    next if sym.is_a?(Hash)
    class_eval(<<-EOS, __FILE__, __LINE__ + 1)
      unless defined? @@#{sym}  # unless defined? @@hair_colors
        @@#{sym} = nil          #   @@hair_colors = nil
      end                       # end
                                #
      def self.#{sym}           # def self.hair_colors
        @@#{sym}                #   @@hair_colors
      end                       # end
                                #
      def #{sym}                # def hair_colors
        @@#{sym}                #   @@hair_colors
      end                       # end
    EOS
  end
end

#cattr_writer(*syms) ⇒ Object 



49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
 
# File 'lib/perennial/core_ext/attribute_accessors.rb', line 49

def cattr_writer(*syms)
  options = syms.extract_options!
  syms.flatten.each do |sym|
    class_eval(<<-EOS, __FILE__, __LINE__ + 1)
      unless defined? @@#{sym}                       # unless defined? @@hair_colors
        @@#{sym} = nil                               #   @@hair_colors = nil
      end                                            # end
                                                     #
      def self.#{sym}=(obj)                          # def self.hair_colors=(obj)
        @@#{sym} = obj                               #   @@hair_colors = obj
      end                                            # end
                                                     #
      #{"                                            #
      def #{sym}=(obj)                               # def hair_colors=(obj)
        @@#{sym} = obj                               #   @@hair_colors = obj
      end                                            # end
      " unless options[:instance_writer] == false }  # # instance writer above is generated unless options[:instance_writer] == false
    EOS
  end
end

#class_inheritable_accessor(*syms, &block) ⇒ Array[#to_s]

Defines class-level inheritable attribute accessor. Attributes are available to subclasses, each subclass has a copy of parent’s attribute.

Parameters:

  • *syms (Array[*#to_s, Hash{:instance_writer => Boolean}]) —

    Array of attributes to define inheritable accessor for.

  • syms (Hash) —

    a customizable set of options

Options Hash (*syms):

  • :instance_writer (Boolean) —

    if true, instance-level inheritable attribute writer is defined.

Returns:

  • (Array[#to_s]) —

    An Array of attributes turned into inheritable accessors.



149
150
151
152
 
# File 'lib/perennial/core_ext/attribute_accessors.rb', line 149

def class_inheritable_accessor(*syms, &block)
  class_inheritable_reader(*syms)
  class_inheritable_writer(*syms, &block)
end

#class_inheritable_reader(*ivars) ⇒ Array[#to_s]

TODO:

Do we want to block instance_reader via :instance_reader => false

TODO:

It would be preferable that we do something with a Hash passed in (error out or do the same as other methods above) instead of silently moving on). In particular, this makes the return value of this function less useful.

Defines class-level inheritable attribute reader. Attributes are available to subclasses, each subclass has a copy of parent’s attribute.

Parameters:

  • *syms (Array[#to_s]) —

    Array of attributes to define inheritable reader for.

Returns:

  • (Array[#to_s]) —

    Array of attributes converted into inheritable_readers.



88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
 
# File 'lib/perennial/core_ext/attribute_accessors.rb', line 88

def class_inheritable_reader(*ivars)
  instance_reader = ivars.pop[:reader] if ivars.last.is_a?(Hash)
 
  ivars.each do |ivar|
    self.class_eval <<-RUBY, __FILE__, __LINE__ + 1
      def self.#{ivar}
        return @#{ivar} if self.object_id == #{self.object_id} || defined?(@#{ivar})
        ivar = superclass.#{ivar}
        return nil if ivar.nil? && !#{self}.instance_variable_defined?("@#{ivar}")
        @#{ivar} = ivar && !ivar.is_a?(Module) && !ivar.is_a?(Numeric) && !ivar.is_a?(TrueClass) && !ivar.is_a?(FalseClass) ? ivar.dup : ivar
      end
    RUBY
    unless instance_reader == false
      self.class_eval <<-RUBY, __FILE__, __LINE__ + 1
        def #{ivar}
          self.class.#{ivar}
        end
      RUBY
    end
  end
end

#class_inheritable_writer(*ivars) ⇒ Array[#to_s]

TODO:

We need a style for class_eval <<-HEREDOC. I’d like to make it class_eval(<<-RUBY, __FILE__, __LINE__), but we should codify it somewhere.

Defines class-level inheritable attribute writer. Attributes are available to subclasses, each subclass has a copy of parent’s attribute.

Parameters:

  • *syms (Array[*#to_s, Hash{:instance_writer => Boolean}]) —

    Array of attributes to define inheritable writer for.

  • syms (Hash) —

    a customizable set of options

Returns:

  • (Array[#to_s]) —

    An Array of the attributes that were made into inheritable writers.



122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
 
# File 'lib/perennial/core_ext/attribute_accessors.rb', line 122

def class_inheritable_writer(*ivars)
  instance_writer = ivars.pop[:writer] if ivars.last.is_a?(Hash)
  ivars.each do |ivar|
    self.class_eval <<-RUBY, __FILE__, __LINE__ + 1
      def self.#{ivar}=(obj)
        @#{ivar} = obj
      end
    RUBY
    unless instance_writer == false
      self.class_eval <<-RUBY, __FILE__, __LINE__ + 1
        def #{ivar}=(obj) self.class.#{ivar} = obj end
      RUBY
    end
 
    self.send("#{ivar}=", yield) if block_given?
  end
end

#is(*mixins) ⇒ Object 



97
98
99
100
101
102
103
104
105
106
 
# File 'lib/perennial/core_ext/misc.rb', line 97

def is(*mixins)
  ns = Perennial::Manifest.namespace
  return if ns.blank?
  mixins.each do |mixin|
    begin
      include ns.const_get(mixin.to_s.camelize)
    rescue NameError
    end
  end
end