Class: Configurable

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

Direct Known Subclasses

Project, Target, Task

Constant Summary collapse

@@options = 
{}

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}, parent = nil) ⇒ Configurable

Returns a new instance of Configurable.



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# File 'lib/configurable.rb', line 117

def initialize(options={}, parent=nil)
  if (parent.is_a?(Configurable))
    parent_options= parent.options
  end
  @options= get_options(options, parent_options)
  @extras= options
end

Instance Attribute Details

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/configurable.rb', line 14

def options
  @options
end

Class Method Details

.option(name, *rest) ⇒ Object

option name, [type], [default], [options]



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# File 'lib/configurable.rb', line 70

def self.option(name, *rest)

  name_string= name.to_s

  info= {
    :aliases=>[name_string, name_string.gsub('_', '-'), name_string.gsub('_', ' ')].uniq
  }

  arg= rest.shift

  if (arg.is_a?(Class))
    info[:type]= arg
    info[:value]= nil #arg.new
    arg= rest.shift
  end

  if (!arg.is_a?(Hash))
    info[:value]= arg
    info[:type]= arg.class if !info.key?(:type)
    arg= rest.shift
  end

  # handle named arguments
  if (arg.is_a?(Hash))
    info.merge!(arg)
  end

  @@options[name]= info

  Configurable.send :define_method, name do
    @options[name]
  end

end

.option_alias(name, name_alias) ⇒ Object 



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# File 'lib/configurable.rb', line 105

def self.option_alias(name, name_alias)
  if (!@@options.key?(name))
    raise ArgumentError, "No such option: #{name}"
  end

  name_alias= name_alias.to_s

  @@options[name][:aliases].concat([name_alias,
                                    name_alias.to_s.gsub('_', '-'),
                                    name_alias.to_s.gsub('_', ' ')].uniq)
end

Instance Method Details

#get_options(settings = nil, parent = nil) ⇒ Object 



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# File 'lib/configurable.rb', line 18

def get_options(settings=nil, parent=nil)
  keys= @@options.keys
  values= @@options.map { |k,v| v[:value] }

  s= Struct.new(*keys).new(*values)
  return s if !settings

  setting_keys= settings.keys.map { |key| key.to_s }

  @@options.each { |key, value|

    intersect= value[:aliases] & setting_keys
    next if !parent && intersect.empty?

    if (intersect.empty?)
      s[key]= parent[key]
      next
    end
  
    if (intersect.length>1)
      raise ArgumentError, "Multiple variants for #{key.to_s} defined: #{intersect.join(", ")}"
    end
        
    setting_key= intersect[0]
    setting_value= settings[setting_key]
    settings.delete(setting_key)
  
    # decide if any type conversions are needed...
    type= value[:type]
    setting_value= case
      when FalseClass==type || TrueClass==type
        Boolean(setting_value)
      when Array==type
        setting_value.is_a?(String) ? setting_value.split(/\s*,\s*/) : setting_value
      when Fixnum==type
        setting_value.to_i
      when NilClass==type
        setting_value
      when String==type
        setting_value.to_s
      else
        type.new(setting_value)
      end
  
    s[key]= setting_value

  }

  s
end