Module: AutoCode

Defined in:
lib/autocode.rb

Class Method Summary collapse

Class Method Details

.camel_case(cname) ⇒ Object 



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# File 'lib/autocode.rb', line 14

def AutoCode.camel_case( cname )  
  cname.to_s.split('_').map do |word|
    "#{word.slice(/^\w/).upcase}#{word.slice(/^\w(\w+)/, 1)}"
  end.join
end

.extended(mod) ⇒ Object 



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# File 'lib/autocode.rb', line 24

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

.included(mod) ⇒ Object 



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# File 'lib/autocode.rb', line 26

def self.included( mod )
  
  mod.instance_eval do
    
    AutoCode.monitor.enter
    begin
      # 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 => []
      }
    ensure
      AutoCode.monitor.exit
    end
    
    def auto_constructor( key = true, &block)
      @autocode[:constructors][ AutoCode.normalize( key ) ] << block
    end
    
    def auto_create( key = true, options = {}, &block )
      auto_constructor( key ) do | cname |
        exemplar = options[:exemplar] || Module.new
        new_constant = exemplar.clone
        new_constant.send(:include, AutoCode)
        ret = const_set( cname, new_constant )
        new_constant.module_eval( &block ) if block
        ret
      end
    end
    
    # Convenience method for auto_creating classes.
    def auto_create_class( key = true, parent = Object, &block )
      auto_constructor( key ) do | cname |
        parent = const_get(parent) unless parent.is_a? Class
        new_constant = Class.new( parent )
        new_constant.send(:include, AutoCode)
        ret = const_set( cname, new_constant )
        new_constant.module_eval( &block ) if block
        ret
      end
    end

    # Convenience method for auto_creating modules.
    def auto_create_module( key = true, &block )
      auto_constructor( key ) do | cname |
        new_constant = Module.new
        new_constant.send(:include, AutoCode)
        ret = const_set( cname, new_constant )
        new_constant.module_eval( &block ) if block
        ret
      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'
        options[:directories] ||= '.'
        path = if target = options[:target]
          target.call(cname)
        else
          options[:directories].
          map { |dir| File.join( dir.to_s, filename ) }.
          find { |path| File.exist?( path ) }
        end
        Kernel.load( path ) unless path.nil?
      end
    end

    # Adds an arbitrary initializer block for the given key
    def auto_eval( key, &block )
      if key.is_a?( Symbol) && const_defined?( AutoCode.normalize( key ) )
        const_get( key ).module_eval( &block)
      else
        @autocode[:initializers][ AutoCode.normalize( key ) ] << lambda do | mod |
          mod.module_eval( &block )
        end
      end
    end
    
    def auto_const?(cname)
      true unless @autocode[:constructors][ AutoCode.normalize( cname ) ].empty?
    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.monitor.synchronize do
        @autocode[:loaded].each { |name| remove_const( name ) } ; @autocode[:loaded] = []
      end
    end

    private

    old = method( :const_missing )
    (class << self ; self ; end ).instance_eval do
      define_method( :const_missing ) do | cname |

        Autocode.monitor.synchronize do
          # check to see if some other thread loaded the constant before
          # we entered the lock.
          return const_get( cname ) if const_defined?( cname )
          actions = []
          @autocode[:constructors].each do |matcher,action|
            actions.concat action if (matcher == true || matcher == cname || matcher === cname.to_s )
          end
          actions.reverse!.find { | c | c.call( cname ) and const_defined?( cname ) }
          return old.call( cname ) unless const_defined?( cname )          
          initializers = @autocode[:initializers][true] + @autocode[:initializers][cname]
          mod = const_get( cname ); initializers.each { |init| init.call( mod ) }
          @autocode[:loaded] << cname
          mod
        end
      end
    end
  end
end

.monitor ⇒ Object 



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# File 'lib/autocode.rb', line 3

def self.monitor
  require 'monitor'
  @monitor ||= Monitor.new
end

.normalize(cname) ⇒ Object

always make sure we have a camel-cased symbol



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

def AutoCode.normalize( cname )
  return cname  unless cname.is_a? Symbol or cname.is_a? String
  camel_case( cname ).intern
end

.snake_case(cname) ⇒ Object 



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# File 'lib/autocode.rb', line 20

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