Class: Xampl::Visitor

Inherits:
Object
  • Object
show all
Defined in:
lib/xamplr/visitor.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Visitor

Returns a new instance of Visitor.



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# File 'lib/xamplr/visitor.rb', line 6

def initialize
  reset
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(symbol, *args) ⇒ Object 



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# File 'lib/xamplr/visitor.rb', line 35

def method_missing(symbol, *args)
  return nil
end

Instance Attribute Details

#done ⇒ Object

Returns the value of attribute done.



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# File 'lib/xamplr/visitor.rb', line 4

def done
  @done
end

#no_children ⇒ Object

Returns the value of attribute no_children.



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# File 'lib/xamplr/visitor.rb', line 4

def no_children
  @no_children
end

#no_siblings ⇒ Object

Returns the value of attribute no_siblings.



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# File 'lib/xamplr/visitor.rb', line 4

def no_siblings
  @no_siblings
end

Instance Method Details

#after_visit(xampl) ⇒ Object 



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# File 'lib/xamplr/visitor.rb', line 47

def after_visit(xampl)
  xampl.after_visit(self)
end

#around_visit(xampl) ⇒ Object 



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# File 'lib/xamplr/visitor.rb', line 51

def around_visit(xampl)
  return false
end

#before_visit(xampl) ⇒ Object 



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# File 'lib/xamplr/visitor.rb', line 43

def before_visit(xampl)
  xampl.before_visit(self)
end

#cycle(xampl) ⇒ Object 



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# File 'lib/xamplr/visitor.rb', line 24

def cycle(xampl)
  return false
end

#reset ⇒ Object 



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# File 'lib/xamplr/visitor.rb', line 10

def reset
  @no_children = false
  @no_siblings = false
  @done = false

  @short_circuit = false

  @visited = {}
  @visiting = {}

  @revisiting = false
  @cycling = false
end

#revisit(xampl) ⇒ Object 



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# File 'lib/xamplr/visitor.rb', line 28

def revisit(xampl)
  return false
end

#short_circuit ⇒ Object 



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# File 'lib/xamplr/visitor.rb', line 32

def short_circuit
end

#start(xampl_in) ⇒ Object 



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# File 'lib/xamplr/visitor.rb', line 58

def start(xampl_in)
  xampl = substitute_in_visit(xampl_in)

  n = @visiting[xampl]
  if n then
    @visiting[xampl] = n + 1
  else
    @visiting[xampl] = 1
  end

  if 1 < @visiting[xampl] then
    return self unless cycle(xampl)
    @cycling = true
    @revisiting = true
  elsif @visited.has_key? xampl then
    return self unless revisit(xampl)
    @revisiting = true
  end

  @visited[xampl] = xampl

  before_visit(xampl)
  if @no_children then
    @no_children = false
    return self
  end

  xampl.visit(self) unless around_visit(xampl) or !xampl.respond_to? "visit"

  return self if @done
  return self if @no_siblings

  if @no_children then
    after_visit(xampl)
    @no_children = false
    return self
  end

  if @short_circuit then
    short_circuit
    @short_circuit = false
  else
    xampl.children.each do | child |
      if child.kind_of?(XamplObject) then
        start(child)
      else
        visit_string(child)
      end

      after_visit(xampl) if @done
      return self if @done

      if @no_siblings then
        @no_siblings = false
        after_visit(xampl)
        return self
      end
    end if xampl.respond_to? "children"
  end

  after_visit(xampl)
  return self

#rescue  => e
#  puts "visit failed !!!!! #{ e }"
#  e.backtrace.each do | trace |
#    puts "  #{trace}"
#    break if /actionpack/ =~ trace
#  end
#  raise e

ensure
  n = @visiting[xampl]
  if 1 == n then
    @visiting.delete(xampl)
  else
    @visiting[xampl] = n - 1
  end
  @revisiting = false
  @cycling = false
end

#substitute_in_visit(xampl) ⇒ Object 



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# File 'lib/xamplr/visitor.rb', line 39

def substitute_in_visit(xampl)
  return xampl.substitute_in_visit(self)
end

#visit_string(string) ⇒ Object 



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# File 'lib/xamplr/visitor.rb', line 55

def visit_string(string)
end