Class: AppKernel::Function::Options

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

Defined Under Namespace

Classes: Option

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Options

Returns a new instance of Options.



137
138
139
140
141
142
143
 
# File 'lib/appkernel/function.rb', line 137

def initialize
  @options = {}
  @indexed = []
  @required = []
  @defaults = []
  @presets = {}
end

Instance Attribute Details

#options ⇒ Object (readonly)

Returns the value of attribute options.



135
136
137
 
# File 'lib/appkernel/function.rb', line 135

def options
  @options
end

Instance Method Details

#add(name, modifiers) ⇒ Object 



145
146
147
 
# File 'lib/appkernel/function.rb', line 145

def add(name, modifiers)
  ingest Option.new(name, modifiers)
end

#canonicalize(args, errors, augment = true) ⇒ Object 



162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
 
# File 'lib/appkernel/function.rb', line 162

def canonicalize(args, errors, augment = true)
  @presets.dup.tap do |canonical|
    indexed = @indexed.dup
    for arg in args
      case arg
        when Hash
          resolved = {}
          for k,v in arg
            if opt = @options[k]
              resolved[k] = opt.resolve(v)
            else
              raise OptionsError, "unknown option '#{k}'"
            end
          end
          canonical.merge! resolved
        else
          if opt = indexed.shift
            canonical[opt.name] = opt.resolve arg
          else
            raise ArgumentError, "too many arguments"
          end
      end
    end
    if augment
      for k in @defaults
        canonical[k] = @options[k].default unless canonical[k]
      end
      canonical.reject! {|k,v| v.nil?}
      for k in @required - canonical.keys
        errors.add(k, "missing required option '#{k}'")
      end
    end
  end
end

#curry(parent, params) ⇒ Object 



11
12
13
14
15
16
17
18
19
20
21
22
 
# File 'lib/appkernel/curry.rb', line 11

def curry(parent, params)
  @presets.merge! parent.canonicalize([params], nil, false)        
  applied, unapplied = parent.options.values.partition {|o| @presets.has_key?(o.name)}
  unapplied.each do |option|
    ingest option
  end
  applied.each do |option|
    if option.required? && @presets[option.name].nil?
      raise AppKernel::OptionsError, "required option '#{option.name}' may not be nil"
    end
  end
end

#ingest(o) ⇒ Object 



149
150
151
152
153
154
155
156
157
158
159
160
 
# File 'lib/appkernel/function.rb', line 149

def ingest(o)        
  @options[o.name] = o
  if o.index
    @indexed[o.index] = o
    @indexed.compact!
  end
  @required << o.name if o.required?
  @defaults << o.name if o.default?
  if o.default? && o.type
    raise IllegalOptionError, "option '#{o.name}' is not a #{o.type}" unless o.default.kind_of?(o.type)
  end                
end