bestmike007/log4rails

# :nodoc:
# Version:: $Id$

require "log4r/base"
require "log4r/repository"
require 'log4r/logevent'

module Log4r
class Logger
  class LoggerFactory #:nodoc:

    # we want to log iff root.lev <= lev && logger.lev <= lev
    # BTW, root is guaranteed to be defined by this point
    def self.define_methods(logger)
      return if logger.is_root?
      undefine_methods(logger)
      globlev = Repository['root'].level
      return if logger.level == OFF or globlev == OFF
      toggle_methods(globlev, logger)
    end

    # set logging methods to null defaults
    def self.undefine_methods(logger)
      for lname in LNAMES
        next if lname == 'OFF'|| lname == 'ALL'
        unset_log(logger, lname)
        set_false(logger, lname)
      end
      set_false(logger, 'all')
      set_true(logger, 'off')
    end
    
    # toggle methods >= globlev that are also >= level
    def self.toggle_methods(globlev, logger)
      for lev in globlev...LEVELS # satisfies >= globlev
        next if lev < logger.level # satisfies >= level
        next if LNAMES[lev] == 'OFF'
        next if LNAMES[lev] == 'ALL'
        set_log(logger, LNAMES[lev])
        set_true(logger, LNAMES[lev])
      end
      if logger.level == ALL
        set_true(logger, 'all')
      end
      if logger.level != OFF && globlev != OFF
        set_false(logger, 'off')
      end
    end

    # And now, the weird dynamic method definitions! :)
  
    def self.unset_log(logger, lname)
      mstr="def logger.#{lname.downcase}(data=nil, propagated=false); end"
      module_eval mstr
    end
    
    # Logger logging methods are defined here.
    def self.set_log(logger, lname) 
      # invoke caller iff the logger invoked is tracing
      tracercall = (logger.trace ? "caller" : "nil")
      # maybe pass parent a logevent. second arg is the switch
      if logger.additive && !logger.parent.is_root?
        parentcall = "@parent.#{lname.downcase}(event, true)"
      end
      mstr = %-
        def logger.#{lname.downcase}(data=nil, propagated=false)
          if propagated then event = data
          else
            data = yield if block_given?
            event = LogEvent.new(#{lname}, self, #{tracercall}, data)
          end
          @outputters.each {|o| o.#{lname.downcase}(event) }
          #{parentcall}
        end
      -
      module_eval mstr
    end
    
    def self.set_false(logger, lname)
      module_eval "def logger.#{lname.downcase}?; false end"
    end

    def self.set_true(logger, lname)
      module_eval "def logger.#{lname.downcase}?; true end"
    end

  end
end
end