Module: AutoCode

Defined in:
lib/autocode.rb

Class Method Summary collapse

Class Method Details

.extended(mod) ⇒ Object 



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# File 'lib/autocode.rb', line 13

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

.included(mod) ⇒ Object 



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# File 'lib/autocode.rb', line 15

def self.included( mod )
  
  mod.instance_eval do

    # First make sure we haven't already done this once
    return unless @autocode.nil?
    
    # Initialize bookkeeping variables needed by AutoCode
    @autocode = { 
      :constructors => Hash.new { |h,k| h[k] = [] },
      :initializers => Hash.new { |h,k| h[k] = [] },
      :loaded => []
    }
    
    # Adds an auto_create block for the given key using the given exemplar if provided
    def auto_create( key = true, options = {}, &block )
      @autocode[:constructors][ AutoCode.normalize( key ) ] << lambda do | cname |
        exemplar = ( options[:exemplar] || Module.new ).clone
        exemplar.module_eval( &block ) if block
        const_set( cname, exemplar )
      end
    end

    # Adds an auto_load block for the given key and directories
    def auto_load( key = true, options = {} )
      @autocode[:constructors][ AutoCode.normalize( key ) ] << lambda do | cname |
        filename = AutoCode.snake_case( cname ) << '.rb'
        if options[:directories].nil?
          Kernel.load( filename ) if File.exist?( filename )
        else
          path = options[:directories].
            map { |dir| File.join( dir.to_s, filename ) }.
            find { |path| File.exist?( path ) }
          Kernel.load( path ) unless path.nil?
        end
      end
    end

    # Adds an arbitrary initializer block for the given key
    def auto_eval( key, &block )
      @autocode[:initializers][ AutoCode.normalize( key ) ] << lambda do | mod |
        mod.module_eval( &block )
      end
    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

    # Returns the list of constants that would be reloaded upon a call to reload.
    def reloadable ; @autocode[:loaded] ; end

    # Reloads (via #remove_const) all the constants that were loaded via auto_code.
    def reload ; @autocode[:loaded].each { |name| remove_const( name ) } ; @autocode[:loaded] = [] ; end

    private

    old = method( :const_missing )
    (class << self ; self ; end ).instance_eval do
      define_method( :const_missing ) do | cname |
        constructors = @autocode[:constructors][true] + @autocode[:constructors][cname]
        constructors.pop.call( cname ) until ( const_defined?( cname ) or constructors.empty? )
        return old.call( cname ) unless const_defined?( cname )
        initializers = @autocode[:initializers][true] + @autocode[:initializers][cname]
        mod = const_get( cname ) ; initializers.pop.call( mod ) until initializers.empty?
        @autocode[:loaded] << 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

.snake_case(cname) ⇒ Object 



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# File 'lib/autocode.rb', line 9

def AutoCode.snake_case( cname )
  cname.to_s.gsub(/([A-Z]+)([A-Z][a-z])/,'\1_\2').gsub(/([a-z\d])([A-Z])/,'\1_\2').downcase
end