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.



193
194
195
196
197
198
199
 
# File 'opal/opal/corelib/marshal/write_buffer.rb', line 193

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

Instance Attribute Details

#buffer ⇒ Object (readonly)

Returns the value of attribute buffer.



183
184
185
 
# File 'opal/opal/corelib/marshal/write_buffer.rb', line 183

def buffer
  @buffer
end

Instance Method Details

#append(s) ⇒ Object 



408
409
410
 
# File 'opal/opal/corelib/marshal/write_buffer.rb', line 408

def append(s)
  `#{@buffer} += #{s}`
end

#append_symbol(sym) ⇒ Object 



285
286
287
288
289
 
# File 'opal/opal/corelib/marshal/write_buffer.rb', line 285

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

#save_link(object) ⇒ Object 



372
373
374
 
# File 'opal/opal/corelib/marshal/write_buffer.rb', line 372

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

#version ⇒ Object 



412
413
414
 
# File 'opal/opal/corelib/marshal/write_buffer.rb', line 412

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

#write(object = @object) ⇒ Object 



201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
 
# File 'opal/opal/corelib/marshal/write_buffer.rb', line 201

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
      Integer.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

  `binaryString(#{@buffer})`
end

#write_array(a) ⇒ Object 



291
292
293
294
295
296
 
# File 'opal/opal/corelib/marshal/write_buffer.rb', line 291

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

#write_bignum(n) ⇒ Object 



260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
 
# File 'opal/opal/corelib/marshal/write_buffer.rb', line 260

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 



311
312
313
 
# File 'opal/opal/corelib/marshal/write_buffer.rb', line 311

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

#write_extends(object) ⇒ Object 



348
349
350
351
352
353
354
355
356
357
358
 
# File 'opal/opal/corelib/marshal/write_buffer.rb', line 348

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
  unless own_mods.empty?
    own_mods.each do |mod|
      append('e')
      append_symbol(mod.name)
    end
  end
end

#write_fixnum(n) ⇒ Object 



226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
 
# File 'opal/opal/corelib/marshal/write_buffer.rb', line 226

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 



324
325
326
327
328
329
330
331
332
333
334
 
# File 'opal/opal/corelib/marshal/write_buffer.rb', line 324

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 



298
299
300
301
302
303
304
 
# File 'opal/opal/corelib/marshal/write_buffer.rb', line 298

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

#write_ivars_prefix(object) ⇒ Object 



402
403
404
405
406
 
# File 'opal/opal/corelib/marshal/write_buffer.rb', line 402

def write_ivars_prefix(object)
  unless object.instance_variables.empty?
    append('I')
  end
end

#write_ivars_suffix(object, force = false) ⇒ Object 



336
337
338
339
340
341
342
343
344
345
346
 
# File 'opal/opal/corelib/marshal/write_buffer.rb', line 336

def write_ivars_suffix(object, force = false)
  if object.instance_variables.empty? && !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 



315
316
317
 
# File 'opal/opal/corelib/marshal/write_buffer.rb', line 315

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

#write_object(obj) ⇒ Object 



306
307
308
309
 
# File 'opal/opal/corelib/marshal/write_buffer.rb', line 306

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

#write_object_link(idx) ⇒ Object 



367
368
369
370
 
# File 'opal/opal/corelib/marshal/write_buffer.rb', line 367

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

#write_regexp(regexp) ⇒ Object 



319
320
321
322
 
# File 'opal/opal/corelib/marshal/write_buffer.rb', line 319

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

#write_string(s) ⇒ Object 



280
281
282
283
 
# File 'opal/opal/corelib/marshal/write_buffer.rb', line 280

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

#write_user_class(klass, object) ⇒ Object 



360
361
362
363
364
365
 
# File 'opal/opal/corelib/marshal/write_buffer.rb', line 360

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

#write_userdef(object) ⇒ Object 



389
390
391
392
393
394
395
396
397
398
399
400
 
# File 'opal/opal/corelib/marshal/write_buffer.rb', line 389

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 



376
377
378
379
380
381
382
383
384
385
386
387
 
# File 'opal/opal/corelib/marshal/write_buffer.rb', line 376

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