Module: Snow::Swizzle

Included in:
Quat, Vec3, Vec4
Defined in:
lib/snow-math/swizzle.rb

Instance Method Summary collapse

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(sym, *args) ⇒ Object 



11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
 
# File 'lib/snow-math/swizzle.rb', line 11

def method_missing(sym, *args)
  chars = sym.to_s
  if chars =~ self.class.class_variable_get(:@@SWIZZLE_CHARS)
    mapping = self.class.class_variable_get(:@@SWIZZLE_MAPPING)
    arg_indices = chars.each_char.map {
      |char|
      index = mapping[char]
      if index.nil?
        raise ArgumentError, "No index mapping for swizzle character #{char} found"
      end
      index
    }
    swizzle_klass = mapping[chars.length]

    if swizzle_klass.nil?
      raise ArgumentError, "No swizzle class defined for #{chars.length} components"
    end

    self.class.class_exec(arg_indices, swizzle_klass) {
      |indices, klass|
      define_method(sym) { klass.new(indices.map { |index| self.fetch(index) }) }
    }
    return self.send(sym)
  end

  super sym, *args
end