Class: Class

Inherits:
Object show all
Defined in:
lib/iron/extensions/class.rb

Instance Method Summary collapse

Instance Method Details

#dsl_accessor(*keys) ⇒ Object

Provides a DSL-friendly way to set values. Similar to attr_accessor, but supports setting values like so:

class Widget
  dsl_accessor :size
end
@w = Widget.new
@w.size = 5  # normal setter, same as...
@w.size 5    # note the lack of explicit = sign
puts @w.size # still get reader access

Useful in DslProxy blocks:

DslProxy.exec(Widget.new) do
  size 10    # sets size to 10, as expected
  size = 10  # fails, creates local variable 'size' instead of invoking Widget#size
end



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# File 'lib/iron/extensions/class.rb', line 21

def dsl_accessor(*keys)
  keys.each do |key|
    class_eval "def #{key}(val = :__UNDEFINED); @#{key} = val unless val == :__UNDEFINED; @#{key}; end"
    class_eval "def #{key}=(val); @#{key} = val; end"
  end
end

#dsl_flag(*keys) ⇒ Object

Like #dsl_accessor, but adds imperative and query versions of the keys as well to set the flag to true and to query the true-ness of the flag.

class Widget
  dsl_flag :heavy
end
@w = Widget.new
@w.heavy?  # => false
@w.heavy!  # now is true



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# File 'lib/iron/extensions/class.rb', line 38

def dsl_flag(*keys)
  dsl_accessor(*keys)
  keys.each do |key|
    class_eval "def #{key}!; @#{key} = true; end"
    class_eval "def #{key}?; @#{key} === true; end"
  end
end