Module: Defly::Tracable

Defined in:
lib/defly/tracable.rb

Instance Method Summary collapse

Instance Method Details

#eigenclass ⇒ Object 



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# File 'lib/defly/tracable.rb', line 80

def eigenclass
  class << self; self; end
end

#trace(methods, variables) {|_self| ... } ⇒ Object

Yields:

  • (_self)

Yield Parameters:



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# File 'lib/defly/tracable.rb', line 3

def trace(methods, variables, &block)
  trace_method!(methods)
  trace_variable!(variables)
  yield self
  untrace!
  
  self
end

#trace_method!(methods) ⇒ Object 



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# File 'lib/defly/tracable.rb', line 12

def trace_method!(methods)
  @__defly_methods ||= []
  
  methods = public_methods(false) if methods.size == 0
  methods.map! {|m| m.to_sym }
  methods -= @__defly_methods
  @__defly_methods |= methods
  
  STDERR << "Tracing #{methods.join(', ')} on #{self.class} instance\n"
  
  methods.each do |m|
    eigenclass.class_eval <<-RUBY, __FILE__, __LINE__
      def #{m}(*args, &block)
        @__defly_level ||= 0
        indent = '    ' * @__defly_level
        
        begin
          STDERR << "\#{indent}<<<<< #{self.class}##{m}(\#{args.join(', ')}) # \#{caller[0]}\n"
          @__defly_level += 1
          result = super
          @__defly_level -= 1
          __defly_check_var(indent) if defined? __defly_check_var
          STDERR << "\#{indent}>>>>> \#{result}\n"
          result
        rescue
          STDERR << "#{m}: \#{$!.class}: \#{$!.message}\n"
          raise
        end
      end
    RUBY
  end
end

#trace_variable!(variables) ⇒ Object 



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# File 'lib/defly/tracable.rb', line 45

def trace_variable!(variables)
  @__defly_variables ||= []
  
  variables = instance_variables if variables.size == 0
  variables.map! {|v| v.to_sym }
  variables -= @__defly_variables
  @__defly_variables |= variables
  
  STDERR << "Tracing #{variables.join(', ')} on #{self.class} instance\n"
  
  unless eigenclass.instance_methods.include? :__defly_check_var
    eigenclass.class_eval <<-RUBY, __FILE__, __LINE__
      def __defly_check_var(indent)
        @__defly_varmap ||= {}
        
        @__defly_variables.each do |v|
          new_val = instance_variable_get(v)
          if @__defly_varmap[v]
            STDERR << "    \#{indent}\#{v.to_s} = \#{new_val.inspect} # \#{@__defly_varmap[v].inspect} -> \#{new_val.inspect}\n" unless @__defly_varmap[v] == new_val
          else
            STDERR << "    \#{indent}\#{v.to_s} = \#{new_val.inspect} # undefined\n"
          end
          @__defly_varmap[v] = new_val
        end
      end
    RUBY
  end
end

#untrace! ⇒ Object 



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# File 'lib/defly/tracable.rb', line 74

def untrace!
  [:__defly_check_var].concat(@__defly_methods).each do |m|
    eigenclass.send(:remove_method, m) if eigenclass.instance_methods.include? m
  end
end