Module: VResource::ClassLoader

Extended by:
Observable2
Defined in:
lib/vresource/class_loader.rb

Class Attribute Summary collapse

Class Method Summary collapse

Methods included from Observable2

add_observer, delete_observer, delete_observers, notify_observers, observers_count

Class Attribute Details

.error_on_defined_constant ⇒ Object

Returns the value of attribute error_on_defined_constant.



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# File 'lib/vresource/class_loader.rb', line 6

def error_on_defined_constant
  @error_on_defined_constant
end

Class Method Details

.hook! ⇒ Object 



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# File 'lib/vresource/class_loader.rb', line 87

def hook!
  unless @hooked          
    ::Module.class_eval do
      alias_method :cl_const_missing, :const_missing
      def const_missing const
        return VResource::ClassLoader.load_class self, const.to_s
      end
    end
    @hooked = true
  end
end

.load_class(namespace, const, reload = false) ⇒ Object 



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# File 'lib/vresource/class_loader.rb', line 26

def load_class namespace, const, reload = false            
  namespace = nil if namespace == Object or namespace == Module
  target_namespace = namespace
  
  # Name hack (for anonymous classes)
  namespace = eval "#{name_hack(namespace)}" if namespace
  
  class_name = namespace ? "#{namespace.name}::#{const}" : const
  simple_also_tried = false
  begin
    simple_also_tried = (namespace == nil)
    
    if try_load(class_name, const)
      defined_in_home_scope = namespace ? namespace.const_defined?(const) : Object.const_defined?(const)            
      
      unless defined_in_home_scope
        msg = "Class Name '#{class_name}' doesn't correspond to File Name '#{VResource.class_to_virtual_file(class_name)}'!"
        raise_without_self NameError, msg, ClassLoader
      end
                    
      unless reload
        if loaded_classes.include? class_name
          if error_on_defined_constant  
            raise_without_self NameError, "Class '#{class_name}' is not defined in the '#{target_namespace}' Namespace!", ClassLoader
          else
            warn "Warn: Class '#{class_name}' is not defined in the '#{target_namespace}' Namespace!"
            puts caller
          end
        end
      end
        
      result = namespace ? namespace.const_get(const) : Object.const_get(const)
      
      loaded_classes[class_name] = target_namespace
      notify_observers :update_class, result
      return result
    elsif namespace
      namespace = Module.namespace_for(namespace.name)
      class_name = namespace ? "#{namespace.name}::#{const}" : const
    end
  end until simple_also_tried
    
  raise_without_self NameError, "uninitialized constant '#{class_name}'!", ClassLoader
end

.loaded_classes ⇒ Object 



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# File 'lib/vresource/class_loader.rb', line 7

def loaded_classes; @loaded_classes ||= {} end

.reload_class(class_name) ⇒ Object 



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# File 'lib/vresource/class_loader.rb', line 17

def reload_class class_name
  class_name = class_name.sub(/^::/, "")
  namespace = Module.namespace_for(class_name);
  name = class_name.sub(/^#{namespace}::/, "")
  return load_class namespace, name, true
end

.unhook! ⇒ Object 



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# File 'lib/vresource/class_loader.rb', line 99

def unhook!
  if @hooked
    ::Module.class_eval do
      alias_method :const_missing, :cl_const_missing
    end
    @hooked = false
  end
end

.update_resource(type, klass, resource) ⇒ Object 



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# File 'lib/vresource/class_loader.rb', line 9

def update_resource type, klass, resource
  if type == :class
    Kernel.print "Reloading #{klass}:"
    reload_class klass.name
    Kernel.print " reloaded.\n"
  end 
end

.wrap_inside_namespace(namespace, script) ⇒ Object 



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# File 'lib/vresource/class_loader.rb', line 72

def wrap_inside_namespace namespace, script
  nesting = []
  if namespace
    current_scope = ""
    namespace.name.split("::").each do |level|
      current_scope += "::#{level}"
      type = eval current_scope, TOPLEVEL_BINDING, __FILE__, __LINE__
      nesting << [level, (type.class == Module ? "module" : "class")]
    end
  end
  begining = nesting.collect{|l, t| "#{t} #{l};"}.join(' ')
  ending = nesting.collect{"end"}.join('; ')
  return "#{begining}#{script} \n#{ending}"
end