Class: AppKernel::Function::Options::Option

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, modifiers = {}) ⇒ Option

Returns a new instance of Option.


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# File 'lib/appkernel/function.rb', line 261

def initialize(name, modifiers = {})
  if name.kind_of?(Option)
    modifiers = modifiers.merge(name.modifiers)
  end
  @name = name.to_sym
  @modifiers = modifiers
  @index = modifiers[:index]
  @required = modifiers[:required] == true
  @lookup = modifiers[:lookup] || modifiers[:parse]
  @type = modifiers[:type]
  @list = modifiers[:list]
  @greedy = modifiers[:greedy]
  begin
    @default = resolve(modifiers[:default])            
  rescue StandardError => e
    raise IllegalOptionError, "invalid default value for option '#{name}': #{e.message}"
  end
  
end

Instance Attribute Details

#default ⇒ Object (readonly)

Returns the value of attribute default.


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# File 'lib/appkernel/function.rb', line 259

def default
  @default
end

#index ⇒ Object (readonly)

Returns the value of attribute index.


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# File 'lib/appkernel/function.rb', line 259

def index
  @index
end

#modifiers ⇒ Object (readonly)

Returns the value of attribute modifiers.


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# File 'lib/appkernel/function.rb', line 259

def modifiers
  @modifiers
end

#name ⇒ Object (readonly)

Returns the value of attribute name.


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# File 'lib/appkernel/function.rb', line 259

def name
  @name
end

#type ⇒ Object (readonly)

Returns the value of attribute type.


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# File 'lib/appkernel/function.rb', line 259

def type
  @type
end

Instance Method Details

#default? ⇒ Boolean

Returns:


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# File 'lib/appkernel/function.rb', line 285

def default?
  !@default.nil?
end

#greedy? ⇒ Boolean

Returns:


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# File 'lib/appkernel/function.rb', line 293

def greedy?
  @greedy
end

#list? ⇒ Boolean

Returns:


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# File 'lib/appkernel/function.rb', line 289

def list?
  @list
end

#required? ⇒ Boolean

Returns:


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# File 'lib/appkernel/function.rb', line 281

def required?
  @required
end

#resolve(o, single = false) ⇒ Object 


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# File 'lib/appkernel/function.rb', line 301

def resolve(o, single = false)
  if o.nil? then nil
  elsif @list && !single
    o.kind_of?(Array) ? o.map {|v| resolve(v,true)} : [resolve(o, true)]  
  elsif @type
    if @type.kind_of?(Class) && o.kind_of?(@type) then o
    elsif @type.kind_of?(Enumerable) && @type.detect {|t| o.kind_of?(t)} then o
    elsif @lookup
      @lookup.call(o)
    elsif @type.respond_to?(:to_option)
      begin
        @type.to_option(o)
      rescue StandardError => e
        raise ArgumentError, "don't know how to convert #{o} into #{@type}: #{e}"
      end
    else
      raise ArgumentError, "don't know how to convert #{o} into #{@type}"
    end
  else
    @lookup ? @lookup.call(o) : o
  end                    
end

#to_sym ⇒ Object 


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# File 'lib/appkernel/function.rb', line 297

def to_sym
  @name
end