1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
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
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
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
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
|
# frozen_string_literal: true
require 'psych/tree_builder'
require 'psych/scalar_scanner'
require 'psych/class_loader'
module Psych
module Visitors
###
# YAMLTree builds a YAML ast given a Ruby object. For example:
#
# builder = Psych::Visitors::YAMLTree.new
# builder << { :foo => 'bar' }
# builder.tree # => #<Psych::Nodes::Stream .. }
#
class YAMLTree < Psych::Visitors::Visitor
class Registrar # :nodoc:
def initialize
@obj_to_id = {}
@obj_to_node = {}
@targets = []
@counter = 0
end
def register target, node
return unless target.respond_to? :object_id
@targets << target
@obj_to_node[target.object_id] = node
end
def key? target
@obj_to_node.key? target.object_id
rescue NoMethodError
false
end
def id_for target
@obj_to_id[target.object_id] ||= (@counter += 1)
end
def node_for target
@obj_to_node[target.object_id]
end
end
attr_reader :started, :finished
alias :finished? :finished
alias :started? :started
def self.create options = {}, emitter = nil
emitter ||= TreeBuilder.new
class_loader = ClassLoader.new
ss = ScalarScanner.new class_loader
new(emitter, ss, options)
end
def initialize emitter, ss, options
super()
@started = false
@finished = false
@emitter = emitter
@st = Registrar.new
@ss = ss
@options = options
@line_width = options[:line_width]
if @line_width && @line_width < 0
if @line_width == -1
# Treat -1 as unlimited line-width, same as libyaml does.
@line_width = nil
else
fail(ArgumentError, "Invalid line_width #{@line_width}, must be non-negative or -1 for unlimited.")
end
end
@coders = []
@dispatch_cache = Hash.new do |h,klass|
method = "visit_#{(klass.name || '').split('::').join('_')}"
method = respond_to?(method) ? method : h[klass.superclass]
raise(TypeError, "Can't dump #{target.class}") unless method
h[klass] = method
end
end
def start encoding = Nodes::Stream::UTF8
@emitter.start_stream(encoding).tap do
@started = true
end
end
def finish
@emitter.end_stream.tap do
@finished = true
end
end
def tree
finish unless finished?
@emitter.root
end
def push object
start unless started?
version = []
version = [1,1] if @options[:header]
case @options[:version]
when Array
version = @options[:version]
when String
version = @options[:version].split('.').map { |x| x.to_i }
else
version = [1,1]
end if @options.key? :version
@emitter.start_document version, [], false
accept object
@emitter.end_document !@emitter.streaming?
end
alias :<< :push
def accept target
# return any aliases we find
if @st.key? target
oid = @st.id_for target
node = @st.node_for target
anchor = oid.to_s
node.anchor = anchor
return @emitter.alias anchor
end
if target.respond_to?(:encode_with)
dump_coder target
else
send(@dispatch_cache[target.class], target)
end
end
def visit_Psych_Omap o
seq = @emitter.start_sequence(nil, 'tag:yaml.org,2002:omap', false, Nodes::Sequence::BLOCK)
register(o, seq)
o.each { |k,v| visit_Hash k => v }
@emitter.end_sequence
end
def visit_Encoding o
tag = "!ruby/encoding"
@emitter.scalar o.name, nil, tag, false, false, Nodes::Scalar::ANY
end
def visit_Object o
tag = Psych.dump_tags[o.class]
unless tag
klass = o.class == Object ? nil : o.class.name
tag = ['!ruby/object', klass].compact.join(':')
end
map = @emitter.start_mapping(nil, tag, false, Nodes::Mapping::BLOCK)
register(o, map)
dump_ivars o
@emitter.end_mapping
end
alias :visit_Delegator :visit_Object
def visit_Struct o
tag = ['!ruby/struct', o.class.name].compact.join(':')
register o, @emitter.start_mapping(nil, tag, false, Nodes::Mapping::BLOCK)
o.members.each do |member|
@emitter.scalar member.to_s, nil, nil, true, false, Nodes::Scalar::ANY
accept o[member]
end
dump_ivars o
@emitter.end_mapping
end
def visit_Exception o
tag = ['!ruby/exception', o.class.name].join ':'
@emitter.start_mapping nil, tag, false, Nodes::Mapping::BLOCK
{
'message' => private_iv_get(o, 'mesg'),
'backtrace' => private_iv_get(o, 'backtrace'),
}.each do |k,v|
next unless v
@emitter.scalar k, nil, nil, true, false, Nodes::Scalar::ANY
accept v
end
dump_ivars o
@emitter.end_mapping
end
def visit_NameError o
tag = ['!ruby/exception', o.class.name].join ':'
@emitter.start_mapping nil, tag, false, Nodes::Mapping::BLOCK
{
'message' => o.message.to_s,
'backtrace' => private_iv_get(o, 'backtrace'),
}.each do |k,v|
next unless v
@emitter.scalar k, nil, nil, true, false, Nodes::Scalar::ANY
accept v
end
dump_ivars o
@emitter.end_mapping
end
def visit_Regexp o
register o, @emitter.scalar(o.inspect, nil, '!ruby/regexp', false, false, Nodes::Scalar::ANY)
end
def visit_DateTime o
formatted = if o.offset.zero?
o.strftime("%Y-%m-%d %H:%M:%S.%9N Z".freeze)
else
o.strftime("%Y-%m-%d %H:%M:%S.%9N %:z".freeze)
end
tag = '!ruby/object:DateTime'
register o, @emitter.scalar(formatted, nil, tag, false, false, Nodes::Scalar::ANY)
end
def visit_Time o
formatted = format_time o
register o, @emitter.scalar(formatted, nil, nil, true, false, Nodes::Scalar::ANY)
end
def visit_Rational o
register o, @emitter.start_mapping(nil, '!ruby/object:Rational', false, Nodes::Mapping::BLOCK)
[
'denominator', o.denominator.to_s,
'numerator', o.numerator.to_s
].each do |m|
@emitter.scalar m, nil, nil, true, false, Nodes::Scalar::ANY
end
@emitter.end_mapping
end
def visit_Complex o
register o, @emitter.start_mapping(nil, '!ruby/object:Complex', false, Nodes::Mapping::BLOCK)
['real', o.real.to_s, 'image', o.imag.to_s].each do |m|
@emitter.scalar m, nil, nil, true, false, Nodes::Scalar::ANY
end
@emitter.end_mapping
end
def visit_Integer o
@emitter.scalar o.to_s, nil, nil, true, false, Nodes::Scalar::ANY
end
alias :visit_TrueClass :visit_Integer
alias :visit_FalseClass :visit_Integer
alias :visit_Date :visit_Integer
def visit_Float o
if o.nan?
@emitter.scalar '.nan', nil, nil, true, false, Nodes::Scalar::ANY
elsif o.infinite?
@emitter.scalar((o.infinite? > 0 ? '.inf' : '-.inf'),
nil, nil, true, false, Nodes::Scalar::ANY)
else
@emitter.scalar o.to_s, nil, nil, true, false, Nodes::Scalar::ANY
end
end
def visit_BigDecimal o
@emitter.scalar o._dump, nil, '!ruby/object:BigDecimal', false, false, Nodes::Scalar::ANY
end
def visit_String o
plain = true
quote = true
style = Nodes::Scalar::PLAIN
tag = nil
if binary?(o)
o = [o].pack('m0')
tag = '!binary' # FIXME: change to below when syck is removed
#tag = 'tag:yaml.org,2002:binary'
style = Nodes::Scalar::LITERAL
plain = false
quote = false
elsif o =~ /\n(?!\Z)/ # match \n except blank line at the end of string
style = Nodes::Scalar::LITERAL
elsif o == '<<'
style = Nodes::Scalar::SINGLE_QUOTED
tag = 'tag:yaml.org,2002:str'
plain = false
quote = false
elsif @line_width && o.length > @line_width
style = Nodes::Scalar::FOLDED
elsif o =~ /^[^[:word:]][^"]*$/
style = Nodes::Scalar::DOUBLE_QUOTED
elsif not String === @ss.tokenize(o) or /\A0[0-7]*[89]/ =~ o
style = Nodes::Scalar::SINGLE_QUOTED
end
is_primitive = o.class == ::String
ivars = is_primitive ? [] : o.instance_variables
if ivars.empty?
unless is_primitive
tag = "!ruby/string:#{o.class}"
plain = false
quote = false
end
@emitter.scalar o, nil, tag, plain, quote, style
else
maptag = '!ruby/string'.dup
maptag << ":#{o.class}" unless o.class == ::String
register o, @emitter.start_mapping(nil, maptag, false, Nodes::Mapping::BLOCK)
@emitter.scalar 'str', nil, nil, true, false, Nodes::Scalar::ANY
@emitter.scalar o, nil, tag, plain, quote, style
dump_ivars o
@emitter.end_mapping
end
end
def visit_Module o
raise TypeError, "can't dump anonymous module: #{o}" unless o.name
register o, @emitter.scalar(o.name, nil, '!ruby/module', false, false, Nodes::Scalar::SINGLE_QUOTED)
end
def visit_Class o
raise TypeError, "can't dump anonymous class: #{o}" unless o.name
register o, @emitter.scalar(o.name, nil, '!ruby/class', false, false, Nodes::Scalar::SINGLE_QUOTED)
end
def visit_Range o
register o, @emitter.start_mapping(nil, '!ruby/range', false, Nodes::Mapping::BLOCK)
['begin', o.begin, 'end', o.end, 'excl', o.exclude_end?].each do |m|
accept m
end
@emitter.end_mapping
end
def visit_Hash o
if o.class == ::Hash
register(o, @emitter.start_mapping(nil, nil, true, Psych::Nodes::Mapping::BLOCK))
o.each do |k,v|
accept k
accept v
end
@emitter.end_mapping
else
visit_hash_subclass o
end
end
def visit_Psych_Set o
register(o, @emitter.start_mapping(nil, '!set', false, Psych::Nodes::Mapping::BLOCK))
o.each do |k,v|
accept k
accept v
end
@emitter.end_mapping
end
def visit_Array o
if o.class == ::Array
visit_Enumerator o
else
visit_array_subclass o
end
end
def visit_Enumerator o
register o, @emitter.start_sequence(nil, nil, true, Nodes::Sequence::BLOCK)
o.each { |c| accept c }
@emitter.end_sequence
end
def visit_NilClass o
@emitter.scalar('', nil, 'tag:yaml.org,2002:null', true, false, Nodes::Scalar::ANY)
end
def visit_Symbol o
if o.empty?
@emitter.scalar "", nil, '!ruby/symbol', false, false, Nodes::Scalar::ANY
else
@emitter.scalar ":#{o}", nil, nil, true, false, Nodes::Scalar::ANY
end
end
def visit_BasicObject o
tag = Psych.dump_tags[o.class]
tag ||= "!ruby/marshalable:#{o.class.name}"
map = @emitter.start_mapping(nil, tag, false, Nodes::Mapping::BLOCK)
register(o, map)
o.marshal_dump.each(&method(:accept))
@emitter.end_mapping
end
private
def binary? string
string.encoding == Encoding::ASCII_8BIT && !string.ascii_only?
end
def visit_array_subclass o
tag = "!ruby/array:#{o.class}"
ivars = o.instance_variables
if ivars.empty?
node = @emitter.start_sequence(nil, tag, false, Nodes::Sequence::BLOCK)
register o, node
o.each { |c| accept c }
@emitter.end_sequence
else
node = @emitter.start_mapping(nil, tag, false, Nodes::Sequence::BLOCK)
register o, node
# Dump the internal list
accept 'internal'
@emitter.start_sequence(nil, nil, true, Nodes::Sequence::BLOCK)
o.each { |c| accept c }
@emitter.end_sequence
# Dump the ivars
accept 'ivars'
@emitter.start_mapping(nil, nil, true, Nodes::Sequence::BLOCK)
ivars.each do |ivar|
accept ivar
accept o.instance_variable_get ivar
end
@emitter.end_mapping
@emitter.end_mapping
end
end
def visit_hash_subclass o
ivars = o.instance_variables
if ivars.any?
tag = "!ruby/hash-with-ivars:#{o.class}"
node = @emitter.start_mapping(nil, tag, false, Psych::Nodes::Mapping::BLOCK)
register(o, node)
# Dump the elements
accept 'elements'
@emitter.start_mapping nil, nil, true, Nodes::Mapping::BLOCK
o.each do |k,v|
accept k
accept v
end
@emitter.end_mapping
# Dump the ivars
accept 'ivars'
@emitter.start_mapping nil, nil, true, Nodes::Mapping::BLOCK
o.instance_variables.each do |ivar|
accept ivar
accept o.instance_variable_get ivar
end
@emitter.end_mapping
@emitter.end_mapping
else
tag = "!ruby/hash:#{o.class}"
node = @emitter.start_mapping(nil, tag, false, Psych::Nodes::Mapping::BLOCK)
register(o, node)
o.each do |k,v|
accept k
accept v
end
@emitter.end_mapping
end
end
def dump_list o
end
def format_time time
if time.utc?
time.strftime("%Y-%m-%d %H:%M:%S.%9N Z")
else
time.strftime("%Y-%m-%d %H:%M:%S.%9N %:z")
end
end
def register target, yaml_obj
@st.register target, yaml_obj
yaml_obj
end
def dump_coder o
@coders << o
tag = Psych.dump_tags[o.class]
unless tag
klass = o.class == Object ? nil : o.class.name
tag = ['!ruby/object', klass].compact.join(':')
end
c = Psych::Coder.new(tag)
o.encode_with(c)
emit_coder c, o
end
def emit_coder c, o
case c.type
when :scalar
@emitter.scalar c.scalar, nil, c.tag, c.tag.nil?, false, Nodes::Scalar::ANY
when :seq
@emitter.start_sequence nil, c.tag, c.tag.nil?, Nodes::Sequence::BLOCK
c.seq.each do |thing|
accept thing
end
@emitter.end_sequence
when :map
register o, @emitter.start_mapping(nil, c.tag, c.implicit, c.style)
c.map.each do |k,v|
accept k
accept v
end
@emitter.end_mapping
when :object
accept c.object
end
end
def dump_ivars target
target.instance_variables.each do |iv|
@emitter.scalar("#{iv.to_s.sub(/^@/, '')}", nil, nil, true, false, Nodes::Scalar::ANY)
accept target.instance_variable_get(iv)
end
end
end
end
end
|