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|
require 'action_dispatch/journey/visitors'
module ActionDispatch
module Journey # :nodoc:
module Nodes # :nodoc:
class Node # :nodoc:
include Enumerable
attr_accessor :left, :memo
def initialize(left)
@left = left
@memo = nil
end
def each(&block)
Visitors::Each::INSTANCE.accept(self, block)
end
def to_s
Visitors::String::INSTANCE.accept(self, '')
end
def to_dot
Visitors::Dot::INSTANCE.accept(self)
end
def to_sym
name.to_sym
end
def name
left.tr '*:'.freeze, ''.freeze
end
def type
raise NotImplementedError
end
def symbol?; false; end
def literal?; false; end
def terminal?; false; end
def star?; false; end
def cat?; false; end
end
class Terminal < Node # :nodoc:
alias :symbol :left
def terminal?; true; end
end
class Literal < Terminal # :nodoc:
def literal?; true; end
def type; :LITERAL; end
end
class Dummy < Literal # :nodoc:
def initialize(x = Object.new)
super
end
def literal?; false; end
end
%w{ Symbol Slash Dot }.each do |t|
class_eval <<-eoruby, __FILE__, __LINE__ + 1
class #{t} < Terminal;
def type; :#{t.upcase}; end
end
eoruby
end
class Symbol < Terminal # :nodoc:
attr_accessor :regexp
alias :symbol :regexp
attr_reader :name
DEFAULT_EXP = /[^\.\/\?]+/
def initialize(left)
super
@regexp = DEFAULT_EXP
@name = left.tr '*:'.freeze, ''.freeze
end
def default_regexp?
regexp == DEFAULT_EXP
end
def symbol?; true; end
end
class Unary < Node # :nodoc:
def children; [left] end
end
class Group < Unary # :nodoc:
def type; :GROUP; end
end
class Star < Unary # :nodoc:
def star?; true; end
def type; :STAR; end
def name
left.name.tr '*:', ''
end
end
class Binary < Node # :nodoc:
attr_accessor :right
def initialize(left, right)
super(left)
@right = right
end
def children; [left, right] end
end
class Cat < Binary # :nodoc:
def cat?; true; end
def type; :CAT; end
end
class Or < Node # :nodoc:
attr_reader :children
def initialize(children)
@children = children
end
def type; :OR; end
end
end
end
end
|
