Class: SuperStruct

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

Class Method Summary collapse

Class Method Details

.new(*args) ⇒ Object 



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# File 'lib/sstruct.rb', line 23

def SuperStruct.new(*args)
  @table = []
  @setsyms = []        # Setter symbols
  klass = Class.new
  if (args.size == 1) && (args[0].is_a? Array)
    args = args[0]
  end
  strs = args.map {|x| x.to_s }
  args.each_with_index do |k,i|
    case
	when (! [String,Symbol].include? k.class)
 raise ArgumentError, "Need a String or Symbol"
      when (strs[i] !~ /[_a-zA-Z][_a-zA-Z0-9]*/)
        raise ArgumentError, "Illegal character"
    end
    k = k.intern if k.is_a? String
    @table << k
    @setsyms << (k.to_s + "=").intern
    klass.instance_eval { attr_accessor k }
  end

  setsyms = @setsyms
  table   = @table
  vals    = @vals
  klass.class_eval do
    attr_reader :singleton
    define_method(:initialize) do |*vals|
      n = vals.size
	m = table.size
	case 
 when n < m
   # raise ArgumentError, "Too few arguments (#{n} for #{m})"
   # Never mind... extra variables will just be nil
 when n > m
   raise ArgumentError, "Too many arguments (#{n} for #{m})"
	end
      setsyms.each_with_index do |var,i|
        self.send(var,vals[i])
      end
    end
    define_method(:pretty_print) do |q|  # pp.rb support
      q.object_group(self) do
        q.seplist(self.members, proc { q.text "," }) do |member|
#         self.members.each do |member|
#           q.text ","  # unless q.first?
          q.breakable
          q.text member.to_s
          q.text '='
          q.group(1) do
            q.breakable ''
            q.pp self[member]
          end
        end
      end
    end
    define_method(:inspect) do
      str = "#<#{self.class}:"
      table.each {|item| str << " #{item}=#{self.send(item)}" }
      str + ">"
    end
    define_method(:[]) do |*index|
      case index.map {|x| x.class }
 when [Fixnum]
          self.send(table[*index])
        when [Fixnum,Fixnum], [Range]
   table[*index].map {|x| self.send(x)}
 when [String]
   self.send(index[0].intern)
 when [Symbol]
   self.send(index[0])
      else
        raise ArgumentError,"Illegal index"
	end
    end
    define_method(:[]=) do |*index|
      value = index[-1]
      index = index[0..-2]
      case index.map {|x| x.class }
 when [Fixnum]
          self.send(table[*index])
        when [Fixnum,Fixnum], [Range]
   setsyms[*index].map {|x| self.send(x,value) }
 when [String]
   self.send(index[0].intern,value)
 when [Symbol]
   self.send(index[0],value)
      else
        raise ArgumentError,"Illegal index"
	end
    end
    define_method(:to_a)    { table.map {|x| eval("@"+x.to_s) } }
    define_method(:to_ary)  { to_a }
    define_method(:members) { table.map {|x| x.to_s } }
    define_method(:to_struct) do
      mems = table
      Struct.new("TEMP",*mems)
      # Struct::TEMP.new(*vals) # Why doesn't this work??
      data = mems.map {|x| self.send(x) }
      Struct::TEMP.new(*data)
    end
    define_method(:to_hash) do
      hash = {}
	table.each do |mem|
        mem = mem.to_s
        hash.update(mem => self.send(mem))
      end
	hash
    end
    define_method(:set) {|h| h.each_pair {|k,v| send(k.to_s+"=",v) } }

    # Class methods...

    @singleton = class << self
      self
    end

    @singleton.instance_eval do
      define_method(:members) do 
 table.map {|x| x.to_s }
	end
      me = self
      define_method(:attr_tester) do |*syms| 
        syms.each {|sym| alias_method(sym.to_s+"?",sym) }
      end
    end

  end
  klass
end

.open(*args) ⇒ Object 



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# File 'lib/sstruct.rb', line 154

def SuperStruct.open(*args)
  klass = SuperStruct.new(*args)
  table = @table
  setsyms = @setsyms
  table = @table
  klass.class_eval do
    define_method(:method_missing) do |meth, *args|
      mname = meth.id2name
      if mname =~ /=$/
        getter = mname.chop
        setter = mname
      elsif mname =~ /\?$/
        raise NoMethodError  # ?-methods are not created automatically
      else
        getter = mname
        setter = mname + "="
      end
      gsym = getter.intern
      ssym = setter.intern
      ivar = "@" + getter
      setsyms << setter
      table << getter
      len = args.length
      if mname == getter
        klass.class_eval do                 # getter
          define_method(getter) do
            instance_variable_get(ivar)
          end
        end
      else
        klass.class_eval do                 # setter
          define_method(setter) do |*args|
            if len != 1
              raise ArgumentError, "Wrong # of arguments (#{len} for 1)", 
                    caller(1)
            end
            instance_variable_set(ivar,args[0])
            instance_variable_get(ivar)
          end
        end
      end
      if mname == setter
        self.send(setter,*args)
      else
        if len == 0
          self.send(getter)
        else
          raise NoMethodError, "Undefined method '#{mname}' for #{self}", 
                caller(1)
        end
      end
    end
  end
  klass
end