# snarfed from redsix.  much can probably be discarded,
# and much is probably non-spec, but we'll get to both in a bit.

module MatchDescribe
  def match_describe(seen=nil)
    seen ||= {}
    return ("LOOP***"+match_describe_name) if seen.member?(self.object_id); seen[self.object_id] = true
    spsp = '  '.force_encoding('utf-8')
    indent            = lambda{|s| s ? s.gsub(/(?m)^(?!\Z)/,spsp) : '*nil*' }
    indent_except_top = lambda{|s| s ? s.gsub(/(?m)^(?!\Z)/,spsp).sub(/^  /,'') : '*nil*' }
    n = match_describe_name
    b = as_b ? 'true' : 'false'
    s = "'"+indent_except_top.call(as_s).gsub(/([\\'])/){|w|"\\#{w}"}+"'"
    a = as_a.map{|m| "\n"+indent.call(m.match_describe(seen))+"," }.join("")
    a += "\n" if a != ""
    h = as_h.map{|k,v|
      vs = if v.instance_of?(Array) and not v.empty?
             "[\n" + indent.call(v.map{|e| (e.respond_to?(:match_describe) ?
                                            e.match_describe(seen) :
                                            e.inspect)}.join(",\n"))+"\n]"
           else
             (v.respond_to?(:match_describe) ?
              v.match_describe(seen) :
              v.inspect)
           end
      "\n  #{k} => #{indent_except_top.call(vs)},"
    }.join("")
    h += "\n" if h != ""
    f = match_beg
    t = match_end
    "#{n}<#{b},#{s},#{f}-#{t},[#{a}],{#{h}}>"
  end
  def match_describe_name()
    "#{self.class}:#{object_id.to_s(36)}"
    # "#{self.class}"
  end
end
class Match
  attr_accessor :on_str,:from,:to,:bool,:hash
  attr_writer :str
  attr_accessor :rule
  def initialize(on_str,from,to,bool,hash,str,rule=nil)
    @on_str,@from,@to,@bool,@hash,@str,@rule=on_str,from,to,bool,hash,str,rule
  end
  def self.new_from(on_str,from=0,to=nil)
    self.new(on_str,from,to,true,{},nil)
  end
  def skim_state_copy
    self.class.new(@on_str,@from,@to,@bool,@hash.skim_state_copy,@str,@rule)
  end
  def str(to=nil)
    return "ERROR:from is nil" if not @from;
    @str || @on_str.slice(@from,(@to||to)-@from)
  end
  def close!(to)
    if @from # otherwise already .failed!
      @to = to
      @str = @on_str.slice(@from,@to-@from) if @from
    end
    self
  end
  def failed!
    @bool,@str,@hash,@from,@to = false,'',{},nil,nil
    self
  end
  def closer_proc
    SkimProc.new{|s,c| self.close!(s.pos); c.cont0(s)}
  end

  include MatchDescribe
  def as_b; @bool end; def as_s; str end; def as_a; [] end; def as_h; @hash end
  def match_beg; @from end; def match_end; @to end
  def match_describe_name; "#{super}:#{rule ? rule : 'nil'}" end
  #def inspect; match_describe end
  #def inspect; STDERR.print "inspection refused - yaml debugging test\n" end
end


class Match
  def [](k)
    #raise "Invalid Match hash key: #{k}\n#{self}\n" if not @hash.key?(k)
    @hash[k]
  end
  def []=(k,v); @hash[k] = v; end
  def key?(k); @hash.key? k; end
  def method_missing(m,*a,&b)
    if @hash.key?(m)
      @hash[m]
    else
      super
    end
  end

  def perl; inspect; end #R XXX hack
  def prepare_for_yaml_dump
    @str = str
    #remove_instance_variable(:@str)
    remove_instance_variable(:@on_str)
    scrub = proc{|x|
      if x.respond_to?(:prepare_for_yaml_dump)
        x.prepare_for_yaml_dump
      elsif x.is_a?(Array)
        x.each{|o2| scrub.call(o2)}
      elsif x.is_a?(Hash)
        x.values.each{|o2| scrub.call(o2)}
      end
    }
    instance_variables.each{|v|
      o = instance_variable_get(v)
      scrub.call(o)
    }
  end
end


class Array
  def to_dump0; '['+map{|e| e.to_dump0}.join(",")+']'; end
end
class Hash
  def to_dump0; '{'+map{|k,v| k.to_s+' => '+v.to_dump0}.join(",")+'}' end
end
class String
  def to_dump0; inspect.gsub(/([$@%])/){|m|'\\'+m[0]} end
end
class Symbol
  def to_dump0; to_s.inspect end
end
class FalseClass
  def to_dump0; '0' end
end
class Fixnum
  def to_dump0; inspect end
end
class Match
  def to_dump0
    b = as_b ? '1' : '0'
    s = "'"+str.gsub(/([\\'])/){|w|"\\#{w}"}+"'"
    #a = as_a.map{|e| "\n"+e.to_dump0+"," }.join("")
    #a += "\n" if a != ""
    h = as_h.map{|k,v|
      vs = v.to_dump0
      "\n  #{k} => #{vs},"
    }.join("")
    h += "\n" if h != ""
    f = match_beg
    t = match_end
    r = @rule.to_s.inspect
    "match(#{r},#{s},#{f},#{t},{#{h}})"
  end
end