Class: Marshal::WriteBuffer

Inherits:
Object show all
Defined in:
opal/opal/corelib/marshal/write_buffer.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(object) ⇒ WriteBuffer

Returns a new instance of WriteBuffer

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# File 'opal/opal/corelib/marshal/write_buffer.rb', line 185

def initialize(object)
  @object = object
  @buffer = BinaryString.new
  @cache = []
  @extends = Hash.new { |h, k| h[k] = [] }
  append(version)
end

Instance Attribute Details

#buffer ⇒ Object (readonly)

Returns the value of attribute buffer


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# File 'opal/opal/corelib/marshal/write_buffer.rb', line 183

def buffer
  @buffer
end

Instance Method Details

#append(s) ⇒ Object

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# File 'opal/opal/corelib/marshal/write_buffer.rb', line 400

def append(s)
  @buffer += s
end

#append_symbol(sym) ⇒ Object

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# File 'opal/opal/corelib/marshal/write_buffer.rb', line 277

def append_symbol(sym)
  append(':')
  write_fixnum(sym.length)
  append(sym)
end

#save_link(object) ⇒ Object

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# File 'opal/opal/corelib/marshal/write_buffer.rb', line 364

def save_link(object)
  @cache << object.object_id
end

#version ⇒ Object

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# File 'opal/opal/corelib/marshal/write_buffer.rb', line 404

def version
  `String.fromCharCode(#{MAJOR_VERSION}, #{MINOR_VERSION})`
end

#write(object = @object) ⇒ Object

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# File 'opal/opal/corelib/marshal/write_buffer.rb', line 193

def write(object = @object)
  if idx = @cache.index(object.object_id)
    write_object_link(idx)
  elsif object.respond_to?(:marshal_dump)
    write_usr_marshal(object)
  elsif object.respond_to?(:_dump)
    write_userdef(object)
  else
    case object
    when nil, true, false, Proc, Method, MatchData, Range, Struct, Array, Class, Module, Hash, Regexp
      object.__marshal__(self)
    when Integer
      Fixnum.instance_method(:__marshal__).bind(object).call(self)
    when Float
      Float.instance_method(:__marshal__).bind(object).call(self)
    when String
      String.instance_method(:__marshal__).bind(object).call(self)
    else
      BasicObject.instance_method(:__marshal__).bind(object).call(self)
    end
  end

  @buffer
end

#write_array(a) ⇒ Object

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# File 'opal/opal/corelib/marshal/write_buffer.rb', line 283

def write_array(a)
  write_fixnum(a.length)
  a.each do |item|
    write(item)
  end
end

#write_bignum(n) ⇒ Object

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# File 'opal/opal/corelib/marshal/write_buffer.rb', line 252

def write_bignum(n)
  sign = n > 0 ? '+' : '-'
  append(sign)

  num = n > 0 ? n : -n

  arr = []
  while num > 0
    arr << (num & 0xffff)
    num = (num / 0x10000).floor
  end

  write_fixnum(arr.size)

  arr.each do |x|
    append(`String.fromCharCode(x & 0xff)`)
    append(`String.fromCharCode(#{(x/0x100).floor})`)
  end
end

#write_class(klass) ⇒ Object

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# File 'opal/opal/corelib/marshal/write_buffer.rb', line 303

def write_class(klass)
  write_string(klass.name)
end

#write_extends(object) ⇒ Object

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# File 'opal/opal/corelib/marshal/write_buffer.rb', line 340

def write_extends(object)
  singleton_mods = object.singleton_class.ancestors.reject { |mod| mod.is_a?(Class) }
  class_mods = object.class.ancestors.reject { |mod| mod.is_a?(Class) }
  own_mods = singleton_mods - class_mods
  if own_mods.length > 0
    own_mods.each do |mod|
      append('e')
      append_symbol(mod.name)
    end
  end
end

#write_fixnum(n) ⇒ Object

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# File 'opal/opal/corelib/marshal/write_buffer.rb', line 218

def write_fixnum(n)
  %x{
    var s;

    if (n == 0) {
      s = String.fromCharCode(n);
    } else if (n > 0 && n < 123) {
      s = String.fromCharCode(n + 5);
    } else if (n < 0 && n > -124) {
      s = String.fromCharCode(256 + n - 5);
    } else {
      s = "";
      var cnt = 0;
      for (var i = 0; i < 4; i++) {
        var b = n & 255;
        s += String.fromCharCode(b);
        n >>= 8
        cnt += 1;
        if (n === 0 || n === -1) {
          break;
        }
      }
      var l_byte;
      if (n < 0) {
        l_byte = 256 - cnt;
      } else {
        l_byte = cnt;
      }
      s = String.fromCharCode(l_byte) + s;
    }
    #{append(`s`)}
  }
end

#write_float(f) ⇒ Object

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# File 'opal/opal/corelib/marshal/write_buffer.rb', line 316

def write_float(f)
  if f.equal?(Float::INFINITY)
    write_string('inf')
  elsif f.equal?(-Float::INFINITY)
    write_string('-inf')
  elsif f.equal?(Float::NAN)
    write_string('nan')
  else
    write_string(f.to_s)
  end
end

#write_hash(h) ⇒ Object

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# File 'opal/opal/corelib/marshal/write_buffer.rb', line 290

def write_hash(h)
  write_fixnum(h.length)
  h.each do |key, value|
    write(key)
    write(value)
  end
end

#write_ivars_prefix(object) ⇒ Object

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# File 'opal/opal/corelib/marshal/write_buffer.rb', line 394

def write_ivars_prefix(object)
  if object.instance_variables.length > 0
    append('I')
  end
end

#write_ivars_suffix(object, force = false) ⇒ Object

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# File 'opal/opal/corelib/marshal/write_buffer.rb', line 328

def write_ivars_suffix(object, force = false)
  if object.instance_variables.length == 0 && !force
    return
  end

  write_fixnum(object.instance_variables.length)
  object.instance_variables.each do |ivar_name|
    append_symbol(ivar_name)
    write(object.instance_variable_get(ivar_name))
  end
end

#write_module(mod) ⇒ Object

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# File 'opal/opal/corelib/marshal/write_buffer.rb', line 307

def write_module(mod)
  write_string(mod.name)
end

#write_object(obj) ⇒ Object

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# File 'opal/opal/corelib/marshal/write_buffer.rb', line 298

def write_object(obj)
  append_symbol(obj.class.name)
  write_ivars_suffix(obj, true)
end

#write_object_link(idx) ⇒ Object

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# File 'opal/opal/corelib/marshal/write_buffer.rb', line 359

def write_object_link(idx)
  append('@')
  write_fixnum(idx)
end

#write_regexp(regexp) ⇒ Object

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# File 'opal/opal/corelib/marshal/write_buffer.rb', line 311

def write_regexp(regexp)
  write_string(regexp.to_s)
  append(`String.fromCharCode(#{regexp.options})`)
end

#write_string(s) ⇒ Object

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# File 'opal/opal/corelib/marshal/write_buffer.rb', line 272

def write_string(s)
  write_fixnum(s.length)
  append(s)
end

#write_user_class(klass, object) ⇒ Object

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# File 'opal/opal/corelib/marshal/write_buffer.rb', line 352

def write_user_class(klass, object)
  unless object.class.equal?(klass)
    append('C')
    append_symbol(object.class.name)
  end
end

#write_userdef(object) ⇒ Object

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# File 'opal/opal/corelib/marshal/write_buffer.rb', line 381

def write_userdef(object)
  value = object._dump(0)

  unless value.is_a?(String)
    raise TypeError, "_dump() must return string"
  end

  write_ivars_prefix(value)
  append('u')
  append_symbol(object.class.name)
  write_string(value)
end

#write_usr_marshal(object) ⇒ Object

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# File 'opal/opal/corelib/marshal/write_buffer.rb', line 368

def write_usr_marshal(object)
  value = object.marshal_dump
  klass = object.class
  append('U')
  namespace = `#{klass}.$$base_module`
  if namespace.equal?(Object)
    append_symbol(`#{klass}.$$name`)
  else
    append_symbol(namespace.name + '::' + `#{klass}.$$name`)
  end
  write(value)
end