Module: Kernel

Defined in:
opal/opal/corelib/kernel.rb

Instance Method Summary collapse

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(symbol, *args, &block) ⇒ Object

Raises:



2
3
4
 
# File 'opal/opal/corelib/kernel.rb', line 2

def method_missing(symbol, *args, &block)
  raise NoMethodError, "undefined method `#{symbol}' for #{inspect}"
end

Instance Method Details

#<=>(other) ⇒ Object 



14
15
16
17
18
19
20
21
22
 
# File 'opal/opal/corelib/kernel.rb', line 14

def <=>(other)
  %x{
    if (#{self == other}) {
      return 0;
    }

    return nil;
  }
end

#===(other) ⇒ Object 



10
11
12
 
# File 'opal/opal/corelib/kernel.rb', line 10

def ===(other)
  self == other
end

#=~(obj) ⇒ Object 



6
7
8
 
# File 'opal/opal/corelib/kernel.rb', line 6

def =~(obj)
  false
end

#Array(object, *args, &block) ⇒ Object 



57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
 
# File 'opal/opal/corelib/kernel.rb', line 57

def Array(object, *args, &block)
  %x{
    if (object == null || object === nil) {
      return [];
    }
    else if (#{object.respond_to? :to_ary}) {
      return #{object.to_ary};
    }
    else if (#{object.respond_to? :to_a}) {
      return #{object.to_a};
    }
    else {
      return [object];
    }
  }
end

#at_exit(&block) ⇒ Object 



74
75
76
77
 
# File 'opal/opal/corelib/kernel.rb', line 74

def at_exit(&block)
  $__at_exit__ ||= []
  $__at_exit__ << block
end

#caller ⇒ Object

Opal does not support #caller, but we stub it as an empty array to not break dependant libs



81
82
83
 
# File 'opal/opal/corelib/kernel.rb', line 81

def caller
  []
end

#class ⇒ Object 



85
86
87
 
# File 'opal/opal/corelib/kernel.rb', line 85

def class
  `self.$$class`
end

#clone ⇒ Object 



99
100
101
102
103
104
105
106
 
# File 'opal/opal/corelib/kernel.rb', line 99

def clone
  copy = self.class.allocate

  copy.copy_instance_variables(self)
  copy.initialize_clone(self)

  copy
end

#copy_instance_variables(other) ⇒ Object 



89
90
91
92
93
94
95
96
97
 
# File 'opal/opal/corelib/kernel.rb', line 89

def copy_instance_variables(other)
  %x{
    for (var name in other) {
      if (name.charAt(0) !== '$') {
        self[name] = other[name];
      }
    }
  }
end

#define_singleton_method(name, &body) ⇒ Object 



112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
 
# File 'opal/opal/corelib/kernel.rb', line 112

def define_singleton_method(name, &body)
  unless body
    raise ArgumentError, "tried to create Proc object without a block"
  end

  %x{
    var jsid   = '$' + name;
    body.$$jsid = name;
    body.$$s    = null;
    body.$$def  = body;

    #{singleton_class}.$$proto[jsid] = body;

    return self;
  }
end

#dup ⇒ Object 



129
130
131
132
133
134
135
136
 
# File 'opal/opal/corelib/kernel.rb', line 129

def dup
  copy = self.class.allocate

  copy.copy_instance_variables(self)
  copy.initialize_dup(self)

  copy
end

#enum_for(method = :each, *args, &block) ⇒ Object Also known as: to_enum 



142
143
144
 
# File 'opal/opal/corelib/kernel.rb', line 142

def enum_for(method = :each, *args, &block)
  Enumerator.for(self, method, *args, &block)
end

#equal?(other) ⇒ Boolean

Returns:



148
149
150
 
# File 'opal/opal/corelib/kernel.rb', line 148

def equal?(other)
  `self === other`
end

#exit(status = true) ⇒ Object 



152
153
154
155
156
157
 
# File 'opal/opal/corelib/kernel.rb', line 152

def exit(status = true)
  $__at_exit__.reverse.each(&:call) if $__at_exit__
  status = 0 if `status === true` # it's in JS because it can be null/undef
  `Opal.exit(status);`
  nil
end

#extend(*mods) ⇒ Object 



159
160
161
162
163
164
165
166
167
168
169
170
171
172
 
# File 'opal/opal/corelib/kernel.rb', line 159

def extend(*mods)
  %x{
    var singleton = #{singleton_class};

    for (var i = mods.length - 1; i >= 0; i--) {
      var mod = mods[i];

      #{`mod`.append_features `singleton`};
      #{`mod`.extended self};
    }
  }

  self
end

#Float(value) ⇒ Object 



397
398
399
400
401
402
403
404
405
 
# File 'opal/opal/corelib/kernel.rb', line 397

def Float(value)
  if String === value
    `parseFloat(value)`
  elsif value.respond_to? :to_f
    value.to_f
  else
    raise TypeError, "can't convert #{value.class} into Float"
  end
end

#format(format, *args) ⇒ Object Also known as: sprintf 



174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
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
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
 
# File 'opal/opal/corelib/kernel.rb', line 174

def format(format, *args)
  %x{
    var idx = 0;
    return format.replace(/%(\d+\$)?([-+ 0]*)(\d*|\*(\d+\$)?)(?:\.(\d*|\*(\d+\$)?))?([cspdiubBoxXfgeEG])|(%%)/g, function(str, idx_str, flags, width_str, w_idx_str, prec_str, p_idx_str, spec, escaped) {
      if (escaped) {
        return '%';
      }

      var width,
      prec,
      is_integer_spec = ("diubBoxX".indexOf(spec) != -1),
      is_float_spec = ("eEfgG".indexOf(spec) != -1),
      prefix = '',
      obj;

      if (width_str === undefined) {
        width = undefined;
      } else if (width_str.charAt(0) == '*') {
        var w_idx = idx++;
        if (w_idx_str) {
          w_idx = parseInt(w_idx_str, 10) - 1;
        }
        width = #{`args[w_idx]`.to_i};
      } else {
        width = parseInt(width_str, 10);
      }
      if (!prec_str) {
        prec = is_float_spec ? 6 : undefined;
      } else if (prec_str.charAt(0) == '*') {
        var p_idx = idx++;
        if (p_idx_str) {
          p_idx = parseInt(p_idx_str, 10) - 1;
        }
        prec = #{`args[p_idx]`.to_i};
      } else {
        prec = parseInt(prec_str, 10);
      }
      if (idx_str) {
        idx = parseInt(idx_str, 10) - 1;
      }
      switch (spec) {
      case 'c':
        obj = args[idx];
        if (obj.$$is_string) {
          str = obj.charAt(0);
        } else {
          str = String.fromCharCode(#{`obj`.to_i});
        }
        break;
      case 's':
        str = #{`args[idx]`.to_s};
        if (prec !== undefined) {
          str = str.substr(0, prec);
        }
        break;
      case 'p':
        str = #{`args[idx]`.inspect};
        if (prec !== undefined) {
          str = str.substr(0, prec);
        }
        break;
      case 'd':
      case 'i':
      case 'u':
        str = #{`args[idx]`.to_i}.toString();
        break;
      case 'b':
      case 'B':
        str = #{`args[idx]`.to_i}.toString(2);
        break;
      case 'o':
        str = #{`args[idx]`.to_i}.toString(8);
        break;
      case 'x':
      case 'X':
        str = #{`args[idx]`.to_i}.toString(16);
        break;
      case 'e':
      case 'E':
        str = #{`args[idx]`.to_f}.toExponential(prec);
        break;
      case 'f':
        str = #{`args[idx]`.to_f}.toFixed(prec);
        break;
      case 'g':
      case 'G':
        str = #{`args[idx]`.to_f}.toPrecision(prec);
        break;
      }
      idx++;
      if (is_integer_spec || is_float_spec) {
        if (str.charAt(0) == '-') {
          prefix = '-';
          str = str.substr(1);
        } else {
          if (flags.indexOf('+') != -1) {
            prefix = '+';
          } else if (flags.indexOf(' ') != -1) {
            prefix = ' ';
          }
        }
      }
      if (is_integer_spec && prec !== undefined) {
        if (str.length < prec) {
          str = #{'0' * `prec - str.length`} + str;
        }
      }
      var total_len = prefix.length + str.length;
      if (width !== undefined && total_len < width) {
        if (flags.indexOf('-') != -1) {
          str = str + #{' ' * `width - total_len`};
        } else {
          var pad_char = ' ';
          if (flags.indexOf('0') != -1) {
            str = #{'0' * `width - total_len`} + str;
          } else {
            prefix = #{' ' * `width - total_len`} + prefix;
          }
        }
      }
      var result = prefix + str;
      if ('XEG'.indexOf(spec) != -1) {
        result = result.toUpperCase();
      }
      return result;
    });
  }
end

#freeze ⇒ Object 



303
304
305
306
 
# File 'opal/opal/corelib/kernel.rb', line 303

def freeze
  @___frozen___ = true
  self
end

#frozen? ⇒ Boolean

Returns:



308
309
310
 
# File 'opal/opal/corelib/kernel.rb', line 308

def frozen?
  @___frozen___ || false
end

#hash ⇒ Object 



312
313
314
 
# File 'opal/opal/corelib/kernel.rb', line 312

def hash
  `[self.$$class.$$name,#{`self.$$class`.__id__},#{__id__}].join(':')`
end

#initialize_clone(other) ⇒ Object 



108
109
110
 
# File 'opal/opal/corelib/kernel.rb', line 108

def initialize_clone(other)
  initialize_copy(other)
end

#initialize_copy(other) ⇒ Object 



316
317
 
# File 'opal/opal/corelib/kernel.rb', line 316

def initialize_copy(other)
end

#initialize_dup(other) ⇒ Object 



138
139
140
 
# File 'opal/opal/corelib/kernel.rb', line 138

def initialize_dup(other)
  initialize_copy(other)
end

#inspect ⇒ Object 



319
320
321
 
# File 'opal/opal/corelib/kernel.rb', line 319

def inspect
  to_s
end

#instance_of?(klass) ⇒ Boolean

Returns:



323
324
325
 
# File 'opal/opal/corelib/kernel.rb', line 323

def instance_of?(klass)
  `self.$$class === klass`
end

#instance_variable_defined?(name) ⇒ Boolean

Returns:



327
328
329
 
# File 'opal/opal/corelib/kernel.rb', line 327

def instance_variable_defined?(name)
  `Opal.hasOwnProperty.call(self, name.substr(1))`
end

#instance_variable_get(name) ⇒ Object 



331
332
333
334
335
336
337
 
# File 'opal/opal/corelib/kernel.rb', line 331

def instance_variable_get(name)
  %x{
    var ivar = self[name.substr(1)];

    return ivar == null ? nil : ivar;
  }
end

#instance_variable_set(name, value) ⇒ Object 



339
340
341
 
# File 'opal/opal/corelib/kernel.rb', line 339

def instance_variable_set(name, value)
  `self[name.substr(1)] = value`
end

#instance_variables ⇒ Object 



343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
 
# File 'opal/opal/corelib/kernel.rb', line 343

def instance_variables
  %x{
    var result = [];

    for (var name in self) {
      if (name.charAt(0) !== '$') {
        if (name !== '$$class' && name !== '$$id') {
          result.push('@' + name);
        }
      }
    }

    return result;
  }
end

#Integer(value, base = nil) ⇒ Object 



359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
 
# File 'opal/opal/corelib/kernel.rb', line 359

def Integer(value, base = nil)
  if String === value
    if value.empty?
      raise ArgumentError, "invalid value for Integer: (empty string)"
    end

    return `parseInt(#{value}, #{base || `undefined`})`
  end

  if base
    raise ArgumentError "base is only valid for String values"
  end

  case value
  when Integer
    value

  when Float
    if value.nan? or value.infinite?
      raise FloatDomainError, "unable to coerce #{value} to Integer"
    end

    value.to_int

  when NilClass
    raise TypeError, "can't convert nil into Integer"

  else
    if value.respond_to? :to_int
      value.to_int
    elsif value.respond_to? :to_i
      value.to_i
    else
      raise TypeError, "can't convert #{value.class} into Integer"
    end
  end
end

#is_a?(klass) ⇒ Boolean Also known as: kind_of?

Returns:



407
408
409
 
# File 'opal/opal/corelib/kernel.rb', line 407

def is_a?(klass)
  `Opal.is_a(self, klass)`
end

#lambda(&block) ⇒ Object 



413
414
415
416
417
 
# File 'opal/opal/corelib/kernel.rb', line 413

def lambda(&block)
  `block.$$is_lambda = true`

  block
end

#load(file) ⇒ Object 



419
420
421
422
 
# File 'opal/opal/corelib/kernel.rb', line 419

def load(file)
  file = Opal.coerce_to!(file, String, :to_str)
  `Opal.load(Opal.normalize_loadable_path(#{file}))`
end

#loop(&block) ⇒ Object 



424
425
426
427
428
429
430
431
432
433
434
 
# File 'opal/opal/corelib/kernel.rb', line 424

def loop(&block)
  %x{
    while (true) {
      if (block() === $breaker) {
        return $breaker.$v;
      }
    }
  }

  self
end

#method(name) ⇒ Object 



24
25
26
27
28
29
30
31
32
33
34
 
# File 'opal/opal/corelib/kernel.rb', line 24

def method(name)
  %x{
    var meth = self['$' + name];

    if (!meth || meth.$$stub) {
      #{raise NameError, "undefined method `#{name}' for class `#{self.class}'"};
    }

    return #{Method.new(self, `meth`, name)};
  }
end

#methods(all = true) ⇒ Object 



36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
 
# File 'opal/opal/corelib/kernel.rb', line 36

def methods(all = true)
  %x{
    var methods = [];

    for (var key in self) {
      if (key[0] == "$" && typeof(self[key]) === "function") {
        if (all == false || all === nil) {
          if (!Opal.hasOwnProperty.call(self, key)) {
            continue;
          }
        }
        if (self[key].$$stub === undefined) {
          methods.push(key.substr(1));
        }
      }
    }

    return methods;
  }
end

#nil? ⇒ Boolean

Returns:



436
437
438
 
# File 'opal/opal/corelib/kernel.rb', line 436

def nil?
  false
end

#p(*args) ⇒ Object 



468
469
470
471
472
 
# File 'opal/opal/corelib/kernel.rb', line 468

def p(*args)
  args.each { |obj| $stdout.puts obj.inspect }

  args.length <= 1 ? args[0] : args
end

#print(*strs) ⇒ Object 



474
475
476
 
# File 'opal/opal/corelib/kernel.rb', line 474

def print(*strs)
  $stdout.print(*strs)
end

#printf(*args) ⇒ Object 



442
443
444
445
446
447
448
 
# File 'opal/opal/corelib/kernel.rb', line 442

def printf(*args)
  if args.length > 0
    print format(*args)
  end

  nil
end

#private_methods ⇒ Object Also known as: private_instance_methods 



450
451
452
 
# File 'opal/opal/corelib/kernel.rb', line 450

def private_methods(*)
  []
end

#proc(&block) ⇒ Object 



455
456
457
458
459
460
461
462
 
# File 'opal/opal/corelib/kernel.rb', line 455

def proc(&block)
  unless block
    raise ArgumentError, "tried to create Proc object without a block"
  end

  `block.$$is_lambda = false`
  block
end

#puts(*strs) ⇒ Object 



464
465
466
 
# File 'opal/opal/corelib/kernel.rb', line 464

def puts(*strs)
  $stdout.puts(*strs)
end

#raise(exception = undefined, string = undefined) ⇒ Object Also known as: fail 



482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
 
# File 'opal/opal/corelib/kernel.rb', line 482

def raise(exception = undefined, string = undefined)
  %x{
    if (exception == null && #$!) {
      exception = #$!;
    }
    else if (exception.$$is_string) {
      exception = #{RuntimeError.new exception};
    }
    else if (!#{exception.is_a? Exception}) {
      exception = #{exception.new string};
    }

    #{$! = exception};
    throw exception;
  }
end

#rand(max = undefined) ⇒ Object Also known as: srand 



501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
 
# File 'opal/opal/corelib/kernel.rb', line 501

def rand(max = undefined)
  %x{
    if (max === undefined) {
      return Math.random();
    }
    else if (max.$$is_range) {
      var arr = #{max.to_a};

      return arr[#{rand(`arr.length`)}];
    }
    else {
      return Math.floor(Math.random() *
        Math.abs(#{Opal.coerce_to max, Integer, :to_int}));
    }
  }
end

#require(file) ⇒ Object 



536
537
538
539
 
# File 'opal/opal/corelib/kernel.rb', line 536

def require(file)
  file = Opal.coerce_to!(file, String, :to_str)
  `Opal.require(Opal.normalize_loadable_path(#{file}))`
end

#require_relative(file) ⇒ Object 



541
542
543
544
545
546
 
# File 'opal/opal/corelib/kernel.rb', line 541

def require_relative(file)
  Opal.try_convert!(file, String, :to_str)
  file = File.expand_path File.join(`Opal.current_file`, '..', file)

  `Opal.require(Opal.normalize_loadable_path(#{file}))`
end

#require_tree(path) ⇒ Object

path should be the full path to be found in registered modules (Opal.modules)



549
550
551
552
553
554
555
556
557
558
559
560
561
 
# File 'opal/opal/corelib/kernel.rb', line 549

def require_tree(path)
  path = File.expand_path(path)

  %x{
    for (var name in Opal.modules) {
      if (#{`name`.start_with?(path)}) {
        Opal.require(name);
      }
    }
  }

  nil
end

#respond_to?(name, include_all = false) ⇒ Boolean

Returns:



518
519
520
521
522
523
524
525
526
527
528
529
530
 
# File 'opal/opal/corelib/kernel.rb', line 518

def respond_to?(name, include_all = false)
  return true if respond_to_missing?(name)

  %x{
    var body = self['$' + name];

    if (typeof(body) === "function" && !body.$$stub) {
      return true;
    }
  }

  false
end

#respond_to_missing?(method_name) ⇒ Boolean

Returns:



532
533
534
 
# File 'opal/opal/corelib/kernel.rb', line 532

def respond_to_missing?(method_name)
  false
end

#singleton_class ⇒ Object 



566
567
568
 
# File 'opal/opal/corelib/kernel.rb', line 566

def singleton_class
  %x{Opal.get_singleton_class(self)}
end

#String(str) ⇒ Object 



574
575
576
 
# File 'opal/opal/corelib/kernel.rb', line 574

def String(str)
  `String(str)`
end

#taint ⇒ Object Also known as: untaint 



578
579
580
 
# File 'opal/opal/corelib/kernel.rb', line 578

def taint
  self
end

#tainted? ⇒ Boolean

Returns:



582
583
584
 
# File 'opal/opal/corelib/kernel.rb', line 582

def tainted?
  false
end

#tap {|_self| ... } ⇒ Object

Yields:

  • (_self)

Yield Parameters:

  • _self (Kernel) —

    the object that the method was called on



586
587
588
589
 
# File 'opal/opal/corelib/kernel.rb', line 586

def tap(&block)
  yield self
  self
end

#to_proc ⇒ Object 



591
592
593
 
# File 'opal/opal/corelib/kernel.rb', line 591

def to_proc
  self
end

#to_s ⇒ Object 



595
596
597
 
# File 'opal/opal/corelib/kernel.rb', line 595

def to_s
  "#<#{self.class}:0x#{__id__.to_s(16)}>"
end

#warn(*strs) ⇒ Object 



478
479
480
 
# File 'opal/opal/corelib/kernel.rb', line 478

def warn(*strs)
  $stderr.puts(*strs) unless $VERBOSE.nil? || strs.empty?
end