Module: AutoCode

Defined in:
lib/autocode.rb

Defined Under Namespace

Classes: Creator, Initializer, Loader

Class Method Summary collapse

Class Method Details

.extended(mod) ⇒ Object 



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# File 'lib/autocode.rb', line 37

def self.extended( mod ) ; included(mod) ; end

.included(mod) ⇒ Object 



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# File 'lib/autocode.rb', line 39

def self.included( mod )
  
  mod.instance_eval do

    # Initialize bookkeeping variables needed by AutoCode
    @initializers ||= Hash.new { |h,k| h[k] = [] }; @reloadable ||= []
    
    # Adds an auto_create block for the given key using the given exemplar if provided
    def auto_create( key = true, options = {}, &block )
      @initializers[ AutoCode.normalize( key ) ] << Creator.new( options, &block ); self
    end

    # Adds an auto_load block for the given key and directories
    def auto_load( key = true, options = {} )
      @initializers[ AutoCode.normalize( key ) ].unshift( Loader.new( options ) ); self
    end

    # Adds an arbitrary initializer block for the given key
    def auto_eval( key, &block )
      @initializers[ AutoCode.normalize( key ) ] << Initializer.new( &block ); self
    end

    # Convenience method for auto_create.
    def auto_create_class( key = true, superclass = Object, &block )
      auto_create( key,{ :exemplar => Class.new( superclass ) }, &block )
    end

    # Convenience method for auto_create.
    def auto_create_module( key = true, &block )
      auto_create( key,{ :exemplar => Module.new }, &block )
    end

    # Reloading stuff ...
    
    # Returns the list of constants that would be reloaded upon a call to reload.
    def reloadable( *names ) ; @reloadable + names ; end

    # Reloads all the constants that were loaded via auto_code. Technically, all reload
    # is doing is undefining them (by calling +remove_const+ on each in turn); they won't get
    # reloaded until they are referenced.
    def reload ; @reloadable.each { |name| remove_const( name ) } ; @reloadable = [] ; self; end

    # Unloads all the constants that were loaded and removes all auto* definitions.
    def unload ; reload ; @initializers = Hash.new { |h,k| h[k] = [] } ; self ; end

    private

    old = method( :const_missing )
    (class << self ; self ; end ).instance_eval do
      define_method :const_missing do | cname |
        ( @initializers[cname] + @initializers[true] ).each do |initializer|
          case initializer 
          when Loader then initializer.call( cname ) unless const_defined?(cname)
          when Creator then const_set( cname, initializer.call ) unless const_defined?(cname)
          else
            return old.call(cname) unless const_defined?( cname )
            initializer.call( const_get( cname ) ) if const_defined?( cname )
          end
        end
        return old.call(cname) unless const_defined?( cname )
        @reloadable << cname ; const_get( cname )
      end
    end
  end
end

.normalize(cname) ⇒ Object

always make sure we have a camel-cased symbol



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# File 'lib/autocode.rb', line 4

def AutoCode.normalize( cname )  
  return cname unless cname.is_a? String
  cname.gsub(/(_)(\w)/) { $2.upcase }.gsub(/^([a-z])/) { $1.upcase }.intern
end