summaryrefslogtreecommitdiffstats
path: root/python/pyyaml/ext/_yaml.pyx
blob: 5158fb4d9ece1a890cb2fb46592f77b8cb0d3b54 (plain)
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
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527

import yaml

def get_version_string():
    cdef char *value
    value = yaml_get_version_string()
    if PY_MAJOR_VERSION < 3:
        return value
    else:
        return PyUnicode_FromString(value)

def get_version():
    cdef int major, minor, patch
    yaml_get_version(&major, &minor, &patch)
    return (major, minor, patch)

#Mark = yaml.error.Mark
YAMLError = yaml.error.YAMLError
ReaderError = yaml.reader.ReaderError
ScannerError = yaml.scanner.ScannerError
ParserError = yaml.parser.ParserError
ComposerError = yaml.composer.ComposerError
ConstructorError = yaml.constructor.ConstructorError
EmitterError = yaml.emitter.EmitterError
SerializerError = yaml.serializer.SerializerError
RepresenterError = yaml.representer.RepresenterError

StreamStartToken = yaml.tokens.StreamStartToken
StreamEndToken = yaml.tokens.StreamEndToken
DirectiveToken = yaml.tokens.DirectiveToken
DocumentStartToken = yaml.tokens.DocumentStartToken
DocumentEndToken = yaml.tokens.DocumentEndToken
BlockSequenceStartToken = yaml.tokens.BlockSequenceStartToken
BlockMappingStartToken = yaml.tokens.BlockMappingStartToken
BlockEndToken = yaml.tokens.BlockEndToken
FlowSequenceStartToken = yaml.tokens.FlowSequenceStartToken
FlowMappingStartToken = yaml.tokens.FlowMappingStartToken
FlowSequenceEndToken = yaml.tokens.FlowSequenceEndToken
FlowMappingEndToken = yaml.tokens.FlowMappingEndToken
KeyToken = yaml.tokens.KeyToken
ValueToken = yaml.tokens.ValueToken
BlockEntryToken = yaml.tokens.BlockEntryToken
FlowEntryToken = yaml.tokens.FlowEntryToken
AliasToken = yaml.tokens.AliasToken
AnchorToken = yaml.tokens.AnchorToken
TagToken = yaml.tokens.TagToken
ScalarToken = yaml.tokens.ScalarToken

StreamStartEvent = yaml.events.StreamStartEvent
StreamEndEvent = yaml.events.StreamEndEvent
DocumentStartEvent = yaml.events.DocumentStartEvent
DocumentEndEvent = yaml.events.DocumentEndEvent
AliasEvent = yaml.events.AliasEvent
ScalarEvent = yaml.events.ScalarEvent
SequenceStartEvent = yaml.events.SequenceStartEvent
SequenceEndEvent = yaml.events.SequenceEndEvent
MappingStartEvent = yaml.events.MappingStartEvent
MappingEndEvent = yaml.events.MappingEndEvent

ScalarNode = yaml.nodes.ScalarNode
SequenceNode = yaml.nodes.SequenceNode
MappingNode = yaml.nodes.MappingNode

cdef class Mark:
    cdef readonly object name
    cdef readonly int index
    cdef readonly int line
    cdef readonly int column
    cdef readonly buffer
    cdef readonly pointer

    def __init__(self, object name, int index, int line, int column,
            object buffer, object pointer):
        self.name = name
        self.index = index
        self.line = line
        self.column = column
        self.buffer = buffer
        self.pointer = pointer

    def get_snippet(self):
        return None

    def __str__(self):
        where = "  in \"%s\", line %d, column %d"   \
                % (self.name, self.line+1, self.column+1)
        return where

#class YAMLError(Exception):
#    pass
#
#class MarkedYAMLError(YAMLError):
#
#    def __init__(self, context=None, context_mark=None,
#            problem=None, problem_mark=None, note=None):
#        self.context = context
#        self.context_mark = context_mark
#        self.problem = problem
#        self.problem_mark = problem_mark
#        self.note = note
#
#    def __str__(self):
#        lines = []
#        if self.context is not None:
#            lines.append(self.context)
#        if self.context_mark is not None  \
#            and (self.problem is None or self.problem_mark is None
#                    or self.context_mark.name != self.problem_mark.name
#                    or self.context_mark.line != self.problem_mark.line
#                    or self.context_mark.column != self.problem_mark.column):
#            lines.append(str(self.context_mark))
#        if self.problem is not None:
#            lines.append(self.problem)
#        if self.problem_mark is not None:
#            lines.append(str(self.problem_mark))
#        if self.note is not None:
#            lines.append(self.note)
#        return '\n'.join(lines)
#
#class ReaderError(YAMLError):
#
#    def __init__(self, name, position, character, encoding, reason):
#        self.name = name
#        self.character = character
#        self.position = position
#        self.encoding = encoding
#        self.reason = reason
#
#    def __str__(self):
#        if isinstance(self.character, str):
#            return "'%s' codec can't decode byte #x%02x: %s\n"  \
#                    "  in \"%s\", position %d"    \
#                    % (self.encoding, ord(self.character), self.reason,
#                            self.name, self.position)
#        else:
#            return "unacceptable character #x%04x: %s\n"    \
#                    "  in \"%s\", position %d"    \
#                    % (ord(self.character), self.reason,
#                            self.name, self.position)
#
#class ScannerError(MarkedYAMLError):
#    pass
#
#class ParserError(MarkedYAMLError):
#    pass
#
#class EmitterError(YAMLError):
#    pass
#
#cdef class Token:
#    cdef readonly Mark start_mark
#    cdef readonly Mark end_mark
#    def __init__(self, Mark start_mark, Mark end_mark):
#        self.start_mark = start_mark
#        self.end_mark = end_mark
#
#cdef class StreamStartToken(Token):
#    cdef readonly object encoding
#    def __init__(self, Mark start_mark, Mark end_mark, encoding):
#        self.start_mark = start_mark
#        self.end_mark = end_mark
#        self.encoding = encoding
#
#cdef class StreamEndToken(Token):
#    pass
#
#cdef class DirectiveToken(Token):
#    cdef readonly object name
#    cdef readonly object value
#    def __init__(self, name, value, Mark start_mark, Mark end_mark):
#        self.name = name
#        self.value = value
#        self.start_mark = start_mark
#        self.end_mark = end_mark
#
#cdef class DocumentStartToken(Token):
#    pass
#
#cdef class DocumentEndToken(Token):
#    pass
#
#cdef class BlockSequenceStartToken(Token):
#    pass
#
#cdef class BlockMappingStartToken(Token):
#    pass
#
#cdef class BlockEndToken(Token):
#    pass
#
#cdef class FlowSequenceStartToken(Token):
#    pass
#
#cdef class FlowMappingStartToken(Token):
#    pass
#
#cdef class FlowSequenceEndToken(Token):
#    pass
#
#cdef class FlowMappingEndToken(Token):
#    pass
#
#cdef class KeyToken(Token):
#    pass
#
#cdef class ValueToken(Token):
#    pass
#
#cdef class BlockEntryToken(Token):
#    pass
#
#cdef class FlowEntryToken(Token):
#    pass
#
#cdef class AliasToken(Token):
#    cdef readonly object value
#    def __init__(self, value, Mark start_mark, Mark end_mark):
#        self.value = value
#        self.start_mark = start_mark
#        self.end_mark = end_mark
#
#cdef class AnchorToken(Token):
#    cdef readonly object value
#    def __init__(self, value, Mark start_mark, Mark end_mark):
#        self.value = value
#        self.start_mark = start_mark
#        self.end_mark = end_mark
#
#cdef class TagToken(Token):
#    cdef readonly object value
#    def __init__(self, value, Mark start_mark, Mark end_mark):
#        self.value = value
#        self.start_mark = start_mark
#        self.end_mark = end_mark
#
#cdef class ScalarToken(Token):
#    cdef readonly object value
#    cdef readonly object plain
#    cdef readonly object style
#    def __init__(self, value, plain, Mark start_mark, Mark end_mark, style=None):
#        self.value = value
#        self.plain = plain
#        self.start_mark = start_mark
#        self.end_mark = end_mark
#        self.style = style

cdef class CParser:

    cdef yaml_parser_t parser
    cdef yaml_event_t parsed_event

    cdef object stream
    cdef object stream_name
    cdef object current_token
    cdef object current_event
    cdef object anchors
    cdef object stream_cache
    cdef int stream_cache_len
    cdef int stream_cache_pos
    cdef int unicode_source

    def __init__(self, stream):
        cdef is_readable
        if yaml_parser_initialize(&self.parser) == 0:
            raise MemoryError
        self.parsed_event.type = YAML_NO_EVENT
        is_readable = 1
        try:
            stream.read
        except AttributeError:
            is_readable = 0
        self.unicode_source = 0
        if is_readable:
            self.stream = stream
            try:
                self.stream_name = stream.name
            except AttributeError:
                if PY_MAJOR_VERSION < 3:
                    self.stream_name = '<file>'
                else:
                    self.stream_name = u'<file>'
            self.stream_cache = None
            self.stream_cache_len = 0
            self.stream_cache_pos = 0
            yaml_parser_set_input(&self.parser, input_handler, <void *>self)
        else:
            if PyUnicode_CheckExact(stream) != 0:
                stream = PyUnicode_AsUTF8String(stream)
                if PY_MAJOR_VERSION < 3:
                    self.stream_name = '<unicode string>'
                else:
                    self.stream_name = u'<unicode string>'
                self.unicode_source = 1
            else:
                if PY_MAJOR_VERSION < 3:
                    self.stream_name = '<byte string>'
                else:
                    self.stream_name = u'<byte string>'
            if PyString_CheckExact(stream) == 0:
                if PY_MAJOR_VERSION < 3:
                    raise TypeError("a string or stream input is required")
                else:
                    raise TypeError(u"a string or stream input is required")
            self.stream = stream
            yaml_parser_set_input_string(&self.parser, PyString_AS_STRING(stream), PyString_GET_SIZE(stream))
        self.current_token = None
        self.current_event = None
        self.anchors = {}

    def __dealloc__(self):
        yaml_parser_delete(&self.parser)
        yaml_event_delete(&self.parsed_event)

    def dispose(self):
        pass

    cdef object _parser_error(self):
        if self.parser.error == YAML_MEMORY_ERROR:
            return MemoryError
        elif self.parser.error == YAML_READER_ERROR:
            if PY_MAJOR_VERSION < 3:
                return ReaderError(self.stream_name, self.parser.problem_offset,
                        self.parser.problem_value, '?', self.parser.problem)
            else:
                return ReaderError(self.stream_name, self.parser.problem_offset,
                        self.parser.problem_value, u'?', PyUnicode_FromString(self.parser.problem))
        elif self.parser.error == YAML_SCANNER_ERROR    \
                or self.parser.error == YAML_PARSER_ERROR:
            context_mark = None
            problem_mark = None
            if self.parser.context != NULL:
                context_mark = Mark(self.stream_name,
                        self.parser.context_mark.index,
                        self.parser.context_mark.line,
                        self.parser.context_mark.column, None, None)
            if self.parser.problem != NULL:
                problem_mark = Mark(self.stream_name,
                        self.parser.problem_mark.index,
                        self.parser.problem_mark.line,
                        self.parser.problem_mark.column, None, None)
            context = None
            if self.parser.context != NULL:
                if PY_MAJOR_VERSION < 3:
                    context = self.parser.context
                else:
                    context = PyUnicode_FromString(self.parser.context)
            if PY_MAJOR_VERSION < 3:
                problem = self.parser.problem
            else:
                problem = PyUnicode_FromString(self.parser.problem)
            if self.parser.error == YAML_SCANNER_ERROR:
                return ScannerError(context, context_mark, problem, problem_mark)
            else:
                return ParserError(context, context_mark, problem, problem_mark)
        if PY_MAJOR_VERSION < 3:
            raise ValueError("no parser error")
        else:
            raise ValueError(u"no parser error")

    def raw_scan(self):
        cdef yaml_token_t token
        cdef int done
        cdef int count
        count = 0
        done = 0
        while done == 0:
            if yaml_parser_scan(&self.parser, &token) == 0:
                error = self._parser_error()
                raise error
            if token.type == YAML_NO_TOKEN:
                done = 1
            else:
                count = count+1
            yaml_token_delete(&token)
        return count

    cdef object _scan(self):
        cdef yaml_token_t token
        if yaml_parser_scan(&self.parser, &token) == 0:
            error = self._parser_error()
            raise error
        token_object = self._token_to_object(&token)
        yaml_token_delete(&token)
        return token_object

    cdef object _token_to_object(self, yaml_token_t *token):
        start_mark = Mark(self.stream_name,
                token.start_mark.index,
                token.start_mark.line,
                token.start_mark.column,
                None, None)
        end_mark = Mark(self.stream_name,
                token.end_mark.index,
                token.end_mark.line,
                token.end_mark.column,
                None, None)
        if token.type == YAML_NO_TOKEN:
            return None
        elif token.type == YAML_STREAM_START_TOKEN:
            encoding = None
            if token.data.stream_start.encoding == YAML_UTF8_ENCODING:
                if self.unicode_source == 0:
                    encoding = u"utf-8"
            elif token.data.stream_start.encoding == YAML_UTF16LE_ENCODING:
                encoding = u"utf-16-le"
            elif token.data.stream_start.encoding == YAML_UTF16BE_ENCODING:
                encoding = u"utf-16-be"
            return StreamStartToken(start_mark, end_mark, encoding)
        elif token.type == YAML_STREAM_END_TOKEN:
            return StreamEndToken(start_mark, end_mark)
        elif token.type == YAML_VERSION_DIRECTIVE_TOKEN:
            return DirectiveToken(u"YAML",
                    (token.data.version_directive.major,
                        token.data.version_directive.minor),
                    start_mark, end_mark)
        elif token.type == YAML_TAG_DIRECTIVE_TOKEN:
            handle = PyUnicode_FromString(token.data.tag_directive.handle)
            prefix = PyUnicode_FromString(token.data.tag_directive.prefix)
            return DirectiveToken(u"TAG", (handle, prefix),
                    start_mark, end_mark)
        elif token.type == YAML_DOCUMENT_START_TOKEN:
            return DocumentStartToken(start_mark, end_mark)
        elif token.type == YAML_DOCUMENT_END_TOKEN:
            return DocumentEndToken(start_mark, end_mark)
        elif token.type == YAML_BLOCK_SEQUENCE_START_TOKEN:
            return BlockSequenceStartToken(start_mark, end_mark)
        elif token.type == YAML_BLOCK_MAPPING_START_TOKEN:
            return BlockMappingStartToken(start_mark, end_mark)
        elif token.type == YAML_BLOCK_END_TOKEN:
            return BlockEndToken(start_mark, end_mark)
        elif token.type == YAML_FLOW_SEQUENCE_START_TOKEN:
            return FlowSequenceStartToken(start_mark, end_mark)
        elif token.type == YAML_FLOW_SEQUENCE_END_TOKEN:
            return FlowSequenceEndToken(start_mark, end_mark)
        elif token.type == YAML_FLOW_MAPPING_START_TOKEN:
            return FlowMappingStartToken(start_mark, end_mark)
        elif token.type == YAML_FLOW_MAPPING_END_TOKEN:
            return FlowMappingEndToken(start_mark, end_mark)
        elif token.type == YAML_BLOCK_ENTRY_TOKEN:
            return BlockEntryToken(start_mark, end_mark)
        elif token.type == YAML_FLOW_ENTRY_TOKEN:
            return FlowEntryToken(start_mark, end_mark)
        elif token.type == YAML_KEY_TOKEN:
            return KeyToken(start_mark, end_mark)
        elif token.type == YAML_VALUE_TOKEN:
            return ValueToken(start_mark, end_mark)
        elif token.type == YAML_ALIAS_TOKEN:
            value = PyUnicode_FromString(token.data.alias.value)
            return AliasToken(value, start_mark, end_mark)
        elif token.type == YAML_ANCHOR_TOKEN:
            value = PyUnicode_FromString(token.data.anchor.value)
            return AnchorToken(value, start_mark, end_mark)
        elif token.type == YAML_TAG_TOKEN:
            handle = PyUnicode_FromString(token.data.tag.handle)
            suffix = PyUnicode_FromString(token.data.tag.suffix)
            if not handle:
                handle = None
            return TagToken((handle, suffix), start_mark, end_mark)
        elif token.type == YAML_SCALAR_TOKEN:
            value = PyUnicode_DecodeUTF8(token.data.scalar.value,
                    token.data.scalar.length, 'strict')
            plain = False
            style = None
            if token.data.scalar.style == YAML_PLAIN_SCALAR_STYLE:
                plain = True
                style = u''
            elif token.data.scalar.style == YAML_SINGLE_QUOTED_SCALAR_STYLE:
                style = u'\''
            elif token.data.scalar.style == YAML_DOUBLE_QUOTED_SCALAR_STYLE:
                style = u'"'
            elif token.data.scalar.style == YAML_LITERAL_SCALAR_STYLE:
                style = u'|'
            elif token.data.scalar.style == YAML_FOLDED_SCALAR_STYLE:
                style = u'>'
            return ScalarToken(value, plain,
                    start_mark, end_mark, style)
        else:
            if PY_MAJOR_VERSION < 3:
                raise ValueError("unknown token type")
            else:
                raise ValueError(u"unknown token type")

    def get_token(self):
        if self.current_token is not None:
            value = self.current_token
            self.current_token = None
        else:
            value = self._scan()
        return value

    def peek_token(self):
        if self.current_token is None:
            self.current_token = self._scan()
        return self.current_token

    def check_token(self, *choices):
        if self.current_token is None:
            self.current_token = self._scan()
        if self.current_token is None:
            return False
        if not choices:
            return True
        token_class = self.current_token.__class__
        for choice in choices:
            if token_class is choice:
                return True
        return False

    def raw_parse(self):
        cdef yaml_event_t event
        cdef int done
        cdef int count
        count = 0
        done = 0
        while done == 0:
            if yaml_parser_parse(&self.parser, &event) == 0:
                error = self._parser_error()
                raise error
            if event.type == YAML_NO_EVENT:
                done = 1
            else:
                count = count+1
            yaml_event_delete(&event)
        return count

    cdef object _parse(self):
        cdef yaml_event_t event
        if yaml_parser_parse(&self.parser, &event) == 0:
            error = self._parser_error()
            raise error
        event_object = self._event_to_object(&event)
        yaml_event_delete(&event)
        return event_object

    cdef object _event_to_object(self, yaml_event_t *event):
        cdef yaml_tag_directive_t *tag_directive
        start_mark = Mark(self.stream_name,
                event.start_mark.index,
                event.start_mark.line,
                event.start_mark.column,
                None, None)
        end_mark = Mark(self.stream_name,
                event.end_mark.index,
                event.end_mark.line,
                event.end_mark.column,
                None, None)
        if event.type == YAML_NO_EVENT:
            return None
        elif event.type == YAML_STREAM_START_EVENT:
            encoding = None
            if event.data.stream_start.encoding == YAML_UTF8_ENCODING:
                if self.unicode_source == 0:
                    encoding = u"utf-8"
            elif event.data.stream_start.encoding == YAML_UTF16LE_ENCODING:
                encoding = u"utf-16-le"
            elif event.data.stream_start.encoding == YAML_UTF16BE_ENCODING:
                encoding = u"utf-16-be"
            return StreamStartEvent(start_mark, end_mark, encoding)
        elif event.type == YAML_STREAM_END_EVENT:
            return StreamEndEvent(start_mark, end_mark)
        elif event.type == YAML_DOCUMENT_START_EVENT:
            explicit = False
            if event.data.document_start.implicit == 0:
                explicit = True
            version = None
            if event.data.document_start.version_directive != NULL:
                version = (event.data.document_start.version_directive.major,
                        event.data.document_start.version_directive.minor)
            tags = None
            if event.data.document_start.tag_directives.start != NULL:
                tags = {}
                tag_directive = event.data.document_start.tag_directives.start
                while tag_directive != event.data.document_start.tag_directives.end:
                    handle = PyUnicode_FromString(tag_directive.handle)
                    prefix = PyUnicode_FromString(tag_directive.prefix)
                    tags[handle] = prefix
                    tag_directive = tag_directive+1
            return DocumentStartEvent(start_mark, end_mark,
                    explicit, version, tags)
        elif event.type == YAML_DOCUMENT_END_EVENT:
            explicit = False
            if event.data.document_end.implicit == 0:
                explicit = True
            return DocumentEndEvent(start_mark, end_mark, explicit)
        elif event.type == YAML_ALIAS_EVENT:
            anchor = PyUnicode_FromString(event.data.alias.anchor)
            return AliasEvent(anchor, start_mark, end_mark)
        elif event.type == YAML_SCALAR_EVENT:
            anchor = None
            if event.data.scalar.anchor != NULL:
                anchor = PyUnicode_FromString(event.data.scalar.anchor)
            tag = None
            if event.data.scalar.tag != NULL:
                tag = PyUnicode_FromString(event.data.scalar.tag)
            value = PyUnicode_DecodeUTF8(event.data.scalar.value,
                    event.data.scalar.length, 'strict')
            plain_implicit = False
            if event.data.scalar.plain_implicit == 1:
                plain_implicit = True
            quoted_implicit = False
            if event.data.scalar.quoted_implicit == 1:
                quoted_implicit = True
            style = None
            if event.data.scalar.style == YAML_PLAIN_SCALAR_STYLE:
                style = u''
            elif event.data.scalar.style == YAML_SINGLE_QUOTED_SCALAR_STYLE:
                style = u'\''
            elif event.data.scalar.style == YAML_DOUBLE_QUOTED_SCALAR_STYLE:
                style = u'"'
            elif event.data.scalar.style == YAML_LITERAL_SCALAR_STYLE:
                style = u'|'
            elif event.data.scalar.style == YAML_FOLDED_SCALAR_STYLE:
                style = u'>'
            return ScalarEvent(anchor, tag,
                    (plain_implicit, quoted_implicit),
                    value, start_mark, end_mark, style)
        elif event.type == YAML_SEQUENCE_START_EVENT:
            anchor = None
            if event.data.sequence_start.anchor != NULL:
                anchor = PyUnicode_FromString(event.data.sequence_start.anchor)
            tag = None
            if event.data.sequence_start.tag != NULL:
                tag = PyUnicode_FromString(event.data.sequence_start.tag)
            implicit = False
            if event.data.sequence_start.implicit == 1:
                implicit = True
            flow_style = None
            if event.data.sequence_start.style == YAML_FLOW_SEQUENCE_STYLE:
                flow_style = True
            elif event.data.sequence_start.style == YAML_BLOCK_SEQUENCE_STYLE:
                flow_style = False
            return SequenceStartEvent(anchor, tag, implicit,
                    start_mark, end_mark, flow_style)
        elif event.type == YAML_MAPPING_START_EVENT:
            anchor = None
            if event.data.mapping_start.anchor != NULL:
                anchor = PyUnicode_FromString(event.data.mapping_start.anchor)
            tag = None
            if event.data.mapping_start.tag != NULL:
                tag = PyUnicode_FromString(event.data.mapping_start.tag)
            implicit = False
            if event.data.mapping_start.implicit == 1:
                implicit = True
            flow_style = None
            if event.data.mapping_start.style == YAML_FLOW_MAPPING_STYLE:
                flow_style = True
            elif event.data.mapping_start.style == YAML_BLOCK_MAPPING_STYLE:
                flow_style = False
            return MappingStartEvent(anchor, tag, implicit,
                    start_mark, end_mark, flow_style)
        elif event.type == YAML_SEQUENCE_END_EVENT:
            return SequenceEndEvent(start_mark, end_mark)
        elif event.type == YAML_MAPPING_END_EVENT:
            return MappingEndEvent(start_mark, end_mark)
        else:
            if PY_MAJOR_VERSION < 3:
                raise ValueError("unknown event type")
            else:
                raise ValueError(u"unknown event type")

    def get_event(self):
        if self.current_event is not None:
            value = self.current_event
            self.current_event = None
        else:
            value = self._parse()
        return value

    def peek_event(self):
        if self.current_event is None:
            self.current_event = self._parse()
        return self.current_event

    def check_event(self, *choices):
        if self.current_event is None:
            self.current_event = self._parse()
        if self.current_event is None:
            return False
        if not choices:
            return True
        event_class = self.current_event.__class__
        for choice in choices:
            if event_class is choice:
                return True
        return False

    def check_node(self):
        self._parse_next_event()
        if self.parsed_event.type == YAML_STREAM_START_EVENT:
            yaml_event_delete(&self.parsed_event)
            self._parse_next_event()
        if self.parsed_event.type != YAML_STREAM_END_EVENT:
            return True
        return False

    def get_node(self):
        self._parse_next_event()
        if self.parsed_event.type != YAML_STREAM_END_EVENT:
            return self._compose_document()

    def get_single_node(self):
        self._parse_next_event()
        yaml_event_delete(&self.parsed_event)
        self._parse_next_event()
        document = None
        if self.parsed_event.type != YAML_STREAM_END_EVENT:
            document = self._compose_document()
        self._parse_next_event()
        if self.parsed_event.type != YAML_STREAM_END_EVENT:
            mark = Mark(self.stream_name,
                    self.parsed_event.start_mark.index,
                    self.parsed_event.start_mark.line,
                    self.parsed_event.start_mark.column,
                    None, None)
            if PY_MAJOR_VERSION < 3:
                raise ComposerError("expected a single document in the stream",
                        document.start_mark, "but found another document", mark)
            else:
                raise ComposerError(u"expected a single document in the stream",
                        document.start_mark, u"but found another document", mark)
        return document

    cdef object _compose_document(self):
        yaml_event_delete(&self.parsed_event)
        node = self._compose_node(None, None)
        self._parse_next_event()
        yaml_event_delete(&self.parsed_event)
        self.anchors = {}
        return node

    cdef object _compose_node(self, object parent, object index):
        self._parse_next_event()
        if self.parsed_event.type == YAML_ALIAS_EVENT:
            anchor = PyUnicode_FromString(self.parsed_event.data.alias.anchor)
            if anchor not in self.anchors:
                mark = Mark(self.stream_name,
                        self.parsed_event.start_mark.index,
                        self.parsed_event.start_mark.line,
                        self.parsed_event.start_mark.column,
                        None, None)
                if PY_MAJOR_VERSION < 3:
                    raise ComposerError(None, None, "found undefined alias", mark)
                else:
                    raise ComposerError(None, None, u"found undefined alias", mark)
            yaml_event_delete(&self.parsed_event)
            return self.anchors[anchor]
        anchor = None
        if self.parsed_event.type == YAML_SCALAR_EVENT  \
                and self.parsed_event.data.scalar.anchor != NULL:
            anchor = PyUnicode_FromString(self.parsed_event.data.scalar.anchor)
        elif self.parsed_event.type == YAML_SEQUENCE_START_EVENT    \
                and self.parsed_event.data.sequence_start.anchor != NULL:
            anchor = PyUnicode_FromString(self.parsed_event.data.sequence_start.anchor)
        elif self.parsed_event.type == YAML_MAPPING_START_EVENT    \
                and self.parsed_event.data.mapping_start.anchor != NULL:
            anchor = PyUnicode_FromString(self.parsed_event.data.mapping_start.anchor)
        if anchor is not None:
            if anchor in self.anchors:
                mark = Mark(self.stream_name,
                        self.parsed_event.start_mark.index,
                        self.parsed_event.start_mark.line,
                        self.parsed_event.start_mark.column,
                        None, None)
                if PY_MAJOR_VERSION < 3:
                    raise ComposerError("found duplicate anchor; first occurence",
                            self.anchors[anchor].start_mark, "second occurence", mark)
                else:
                    raise ComposerError(u"found duplicate anchor; first occurence",
                            self.anchors[anchor].start_mark, u"second occurence", mark)
        self.descend_resolver(parent, index)
        if self.parsed_event.type == YAML_SCALAR_EVENT:
            node = self._compose_scalar_node(anchor)
        elif self.parsed_event.type == YAML_SEQUENCE_START_EVENT:
            node = self._compose_sequence_node(anchor)
        elif self.parsed_event.type == YAML_MAPPING_START_EVENT:
            node = self._compose_mapping_node(anchor)
        self.ascend_resolver()
        return node

    cdef _compose_scalar_node(self, object anchor):
        start_mark = Mark(self.stream_name,
                self.parsed_event.start_mark.index,
                self.parsed_event.start_mark.line,
                self.parsed_event.start_mark.column,
                None, None)
        end_mark = Mark(self.stream_name,
                self.parsed_event.end_mark.index,
                self.parsed_event.end_mark.line,
                self.parsed_event.end_mark.column,
                None, None)
        value = PyUnicode_DecodeUTF8(self.parsed_event.data.scalar.value,
                self.parsed_event.data.scalar.length, 'strict')
        plain_implicit = False
        if self.parsed_event.data.scalar.plain_implicit == 1:
            plain_implicit = True
        quoted_implicit = False
        if self.parsed_event.data.scalar.quoted_implicit == 1:
            quoted_implicit = True
        if self.parsed_event.data.scalar.tag == NULL    \
                or (self.parsed_event.data.scalar.tag[0] == c'!'
                        and self.parsed_event.data.scalar.tag[1] == c'\0'):
            tag = self.resolve(ScalarNode, value, (plain_implicit, quoted_implicit))
        else:
            tag = PyUnicode_FromString(self.parsed_event.data.scalar.tag)
        style = None
        if self.parsed_event.data.scalar.style == YAML_PLAIN_SCALAR_STYLE:
            style = u''
        elif self.parsed_event.data.scalar.style == YAML_SINGLE_QUOTED_SCALAR_STYLE:
            style = u'\''
        elif self.parsed_event.data.scalar.style == YAML_DOUBLE_QUOTED_SCALAR_STYLE:
            style = u'"'
        elif self.parsed_event.data.scalar.style == YAML_LITERAL_SCALAR_STYLE:
            style = u'|'
        elif self.parsed_event.data.scalar.style == YAML_FOLDED_SCALAR_STYLE:
            style = u'>'
        node = ScalarNode(tag, value, start_mark, end_mark, style)
        if anchor is not None:
            self.anchors[anchor] = node
        yaml_event_delete(&self.parsed_event)
        return node

    cdef _compose_sequence_node(self, object anchor):
        cdef int index
        start_mark = Mark(self.stream_name,
                self.parsed_event.start_mark.index,
                self.parsed_event.start_mark.line,
                self.parsed_event.start_mark.column,
                None, None)
        implicit = False
        if self.parsed_event.data.sequence_start.implicit == 1:
            implicit = True
        if self.parsed_event.data.sequence_start.tag == NULL    \
                or (self.parsed_event.data.sequence_start.tag[0] == c'!'
                        and self.parsed_event.data.sequence_start.tag[1] == c'\0'):
            tag = self.resolve(SequenceNode, None, implicit)
        else:
            tag = PyUnicode_FromString(self.parsed_event.data.sequence_start.tag)
        flow_style = None
        if self.parsed_event.data.sequence_start.style == YAML_FLOW_SEQUENCE_STYLE:
            flow_style = True
        elif self.parsed_event.data.sequence_start.style == YAML_BLOCK_SEQUENCE_STYLE:
            flow_style = False
        value = []
        node = SequenceNode(tag, value, start_mark, None, flow_style)
        if anchor is not None:
            self.anchors[anchor] = node
        yaml_event_delete(&self.parsed_event)
        index = 0
        self._parse_next_event()
        while self.parsed_event.type != YAML_SEQUENCE_END_EVENT:
            value.append(self._compose_node(node, index))
            index = index+1
            self._parse_next_event()
        node.end_mark = Mark(self.stream_name,
                self.parsed_event.end_mark.index,
                self.parsed_event.end_mark.line,
                self.parsed_event.end_mark.column,
                None, None)
        yaml_event_delete(&self.parsed_event)
        return node

    cdef _compose_mapping_node(self, object anchor):
        start_mark = Mark(self.stream_name,
                self.parsed_event.start_mark.index,
                self.parsed_event.start_mark.line,
                self.parsed_event.start_mark.column,
                None, None)
        implicit = False
        if self.parsed_event.data.mapping_start.implicit == 1:
            implicit = True
        if self.parsed_event.data.mapping_start.tag == NULL    \
                or (self.parsed_event.data.mapping_start.tag[0] == c'!'
                        and self.parsed_event.data.mapping_start.tag[1] == c'\0'):
            tag = self.resolve(MappingNode, None, implicit)
        else:
            tag = PyUnicode_FromString(self.parsed_event.data.mapping_start.tag)
        flow_style = None
        if self.parsed_event.data.mapping_start.style == YAML_FLOW_MAPPING_STYLE:
            flow_style = True
        elif self.parsed_event.data.mapping_start.style == YAML_BLOCK_MAPPING_STYLE:
            flow_style = False
        value = []
        node = MappingNode(tag, value, start_mark, None, flow_style)
        if anchor is not None:
            self.anchors[anchor] = node
        yaml_event_delete(&self.parsed_event)
        self._parse_next_event()
        while self.parsed_event.type != YAML_MAPPING_END_EVENT:
            item_key = self._compose_node(node, None)
            item_value = self._compose_node(node, item_key)
            value.append((item_key, item_value))
            self._parse_next_event()
        node.end_mark = Mark(self.stream_name,
                self.parsed_event.end_mark.index,
                self.parsed_event.end_mark.line,
                self.parsed_event.end_mark.column,
                None, None)
        yaml_event_delete(&self.parsed_event)
        return node

    cdef int _parse_next_event(self) except 0:
        if self.parsed_event.type == YAML_NO_EVENT:
            if yaml_parser_parse(&self.parser, &self.parsed_event) == 0:
                error = self._parser_error()
                raise error
        return 1

cdef int input_handler(void *data, char *buffer, int size, int *read) except 0:
    cdef CParser parser
    parser = <CParser>data
    if parser.stream_cache is None:
        value = parser.stream.read(size)
        if PyUnicode_CheckExact(value) != 0:
            value = PyUnicode_AsUTF8String(value)
            parser.unicode_source = 1
        if PyString_CheckExact(value) == 0:
            if PY_MAJOR_VERSION < 3:
                raise TypeError("a string value is expected")
            else:
                raise TypeError(u"a string value is expected")
        parser.stream_cache = value
        parser.stream_cache_pos = 0
        parser.stream_cache_len = PyString_GET_SIZE(value)
    if (parser.stream_cache_len - parser.stream_cache_pos) < size:
        size = parser.stream_cache_len - parser.stream_cache_pos
    if size > 0:
        memcpy(buffer, PyString_AS_STRING(parser.stream_cache)
                            + parser.stream_cache_pos, size)
    read[0] = size
    parser.stream_cache_pos += size
    if parser.stream_cache_pos == parser.stream_cache_len:
        parser.stream_cache = None
    return 1

cdef class CEmitter:

    cdef yaml_emitter_t emitter

    cdef object stream

    cdef int document_start_implicit
    cdef int document_end_implicit
    cdef object use_version
    cdef object use_tags

    cdef object serialized_nodes
    cdef object anchors
    cdef int last_alias_id
    cdef int closed
    cdef int dump_unicode
    cdef object use_encoding

    def __init__(self, stream, canonical=None, indent=None, width=None,
            allow_unicode=None, line_break=None, encoding=None,
            explicit_start=None, explicit_end=None, version=None, tags=None):
        if yaml_emitter_initialize(&self.emitter) == 0:
            raise MemoryError
        self.stream = stream
        self.dump_unicode = 0
        if PY_MAJOR_VERSION < 3:
            if getattr3(stream, 'encoding', None):
                self.dump_unicode = 1
        else:
            if hasattr(stream, u'encoding'):
                self.dump_unicode = 1
        self.use_encoding = encoding
        yaml_emitter_set_output(&self.emitter, output_handler, <void *>self)    
        if canonical:
            yaml_emitter_set_canonical(&self.emitter, 1)
        if indent is not None:
            yaml_emitter_set_indent(&self.emitter, indent)
        if width is not None:
            yaml_emitter_set_width(&self.emitter, width)
        if allow_unicode:
            yaml_emitter_set_unicode(&self.emitter, 1)
        if line_break is not None:
            if line_break == '\r':
                yaml_emitter_set_break(&self.emitter, YAML_CR_BREAK)
            elif line_break == '\n':
                yaml_emitter_set_break(&self.emitter, YAML_LN_BREAK)
            elif line_break == '\r\n':
                yaml_emitter_set_break(&self.emitter, YAML_CRLN_BREAK)
        self.document_start_implicit = 1
        if explicit_start:
            self.document_start_implicit = 0
        self.document_end_implicit = 1
        if explicit_end:
            self.document_end_implicit = 0
        self.use_version = version
        self.use_tags = tags
        self.serialized_nodes = {}
        self.anchors = {}
        self.last_alias_id = 0
        self.closed = -1

    def __dealloc__(self):
        yaml_emitter_delete(&self.emitter)

    def dispose(self):
        pass

    cdef object _emitter_error(self):
        if self.emitter.error == YAML_MEMORY_ERROR:
            return MemoryError
        elif self.emitter.error == YAML_EMITTER_ERROR:
            if PY_MAJOR_VERSION < 3:
                problem = self.emitter.problem
            else:
                problem = PyUnicode_FromString(self.emitter.problem)
            return EmitterError(problem)
        if PY_MAJOR_VERSION < 3:
            raise ValueError("no emitter error")
        else:
            raise ValueError(u"no emitter error")

    cdef int _object_to_event(self, object event_object, yaml_event_t *event) except 0:
        cdef yaml_encoding_t encoding
        cdef yaml_version_directive_t version_directive_value
        cdef yaml_version_directive_t *version_directive
        cdef yaml_tag_directive_t tag_directives_value[128]
        cdef yaml_tag_directive_t *tag_directives_start
        cdef yaml_tag_directive_t *tag_directives_end
        cdef int implicit
        cdef int plain_implicit
        cdef int quoted_implicit
        cdef char *anchor
        cdef char *tag
        cdef char *value
        cdef int length
        cdef yaml_scalar_style_t scalar_style
        cdef yaml_sequence_style_t sequence_style
        cdef yaml_mapping_style_t mapping_style
        event_class = event_object.__class__
        if event_class is StreamStartEvent:
            encoding = YAML_UTF8_ENCODING
            if event_object.encoding == u'utf-16-le' or event_object.encoding == 'utf-16-le':
                encoding = YAML_UTF16LE_ENCODING
            elif event_object.encoding == u'utf-16-be' or event_object.encoding == 'utf-16-be':
                encoding = YAML_UTF16BE_ENCODING
            if event_object.encoding is None:
                self.dump_unicode = 1
            if self.dump_unicode == 1:
                encoding = YAML_UTF8_ENCODING
            yaml_stream_start_event_initialize(event, encoding)
        elif event_class is StreamEndEvent:
            yaml_stream_end_event_initialize(event)
        elif event_class is DocumentStartEvent:
            version_directive = NULL
            if event_object.version:
                version_directive_value.major = event_object.version[0]
                version_directive_value.minor = event_object.version[1]
                version_directive = &version_directive_value
            tag_directives_start = NULL
            tag_directives_end = NULL
            if event_object.tags:
                if len(event_object.tags) > 128:
                    if PY_MAJOR_VERSION < 3:
                        raise ValueError("too many tags")
                    else:
                        raise ValueError(u"too many tags")
                tag_directives_start = tag_directives_value
                tag_directives_end = tag_directives_value
                cache = []
                for handle in event_object.tags:
                    prefix = event_object.tags[handle]
                    if PyUnicode_CheckExact(handle):
                        handle = PyUnicode_AsUTF8String(handle)
                        cache.append(handle)
                    if not PyString_CheckExact(handle):
                        if PY_MAJOR_VERSION < 3:
                            raise TypeError("tag handle must be a string")
                        else:
                            raise TypeError(u"tag handle must be a string")
                    tag_directives_end.handle = PyString_AS_STRING(handle)
                    if PyUnicode_CheckExact(prefix):
                        prefix = PyUnicode_AsUTF8String(prefix)
                        cache.append(prefix)
                    if not PyString_CheckExact(prefix):
                        if PY_MAJOR_VERSION < 3:
                            raise TypeError("tag prefix must be a string")
                        else:
                            raise TypeError(u"tag prefix must be a string")
                    tag_directives_end.prefix = PyString_AS_STRING(prefix)
                    tag_directives_end = tag_directives_end+1
            implicit = 1
            if event_object.explicit:
                implicit = 0
            if yaml_document_start_event_initialize(event, version_directive,
                    tag_directives_start, tag_directives_end, implicit) == 0:
                raise MemoryError
        elif event_class is DocumentEndEvent:
            implicit = 1
            if event_object.explicit:
                implicit = 0
            yaml_document_end_event_initialize(event, implicit)
        elif event_class is AliasEvent:
            anchor = NULL
            anchor_object = event_object.anchor
            if PyUnicode_CheckExact(anchor_object):
                anchor_object = PyUnicode_AsUTF8String(anchor_object)
            if not PyString_CheckExact(anchor_object):
                if PY_MAJOR_VERSION < 3:
                    raise TypeError("anchor must be a string")
                else:
                    raise TypeError(u"anchor must be a string")
            anchor = PyString_AS_STRING(anchor_object)
            if yaml_alias_event_initialize(event, anchor) == 0:
                raise MemoryError
        elif event_class is ScalarEvent:
            anchor = NULL
            anchor_object = event_object.anchor
            if anchor_object is not None:
                if PyUnicode_CheckExact(anchor_object):
                    anchor_object = PyUnicode_AsUTF8String(anchor_object)
                if not PyString_CheckExact(anchor_object):
                    if PY_MAJOR_VERSION < 3:
                        raise TypeError("anchor must be a string")
                    else:
                        raise TypeError(u"anchor must be a string")
                anchor = PyString_AS_STRING(anchor_object)
            tag = NULL
            tag_object = event_object.tag
            if tag_object is not None:
                if PyUnicode_CheckExact(tag_object):
                    tag_object = PyUnicode_AsUTF8String(tag_object)
                if not PyString_CheckExact(tag_object):
                    if PY_MAJOR_VERSION < 3:
                        raise TypeError("tag must be a string")
                    else:
                        raise TypeError(u"tag must be a string")
                tag = PyString_AS_STRING(tag_object)
            value_object = event_object.value
            if PyUnicode_CheckExact(value_object):
                value_object = PyUnicode_AsUTF8String(value_object)
            if not PyString_CheckExact(value_object):
                if PY_MAJOR_VERSION < 3:
                    raise TypeError("value must be a string")
                else:
                    raise TypeError(u"value must be a string")
            value = PyString_AS_STRING(value_object)
            length = PyString_GET_SIZE(value_object)
            plain_implicit = 0
            quoted_implicit = 0
            if event_object.implicit is not None:
                plain_implicit = event_object.implicit[0]
                quoted_implicit = event_object.implicit[1]
            style_object = event_object.style
            scalar_style = YAML_PLAIN_SCALAR_STYLE
            if style_object == "'" or style_object == u"'":
                scalar_style = YAML_SINGLE_QUOTED_SCALAR_STYLE
            elif style_object == "\"" or style_object == u"\"":
                scalar_style = YAML_DOUBLE_QUOTED_SCALAR_STYLE
            elif style_object == "|" or style_object == u"|":
                scalar_style = YAML_LITERAL_SCALAR_STYLE
            elif style_object == ">" or style_object == u">":
                scalar_style = YAML_FOLDED_SCALAR_STYLE
            if yaml_scalar_event_initialize(event, anchor, tag, value, length,
                    plain_implicit, quoted_implicit, scalar_style) == 0:
                raise MemoryError
        elif event_class is SequenceStartEvent:
            anchor = NULL
            anchor_object = event_object.anchor
            if anchor_object is not None:
                if PyUnicode_CheckExact(anchor_object):
                    anchor_object = PyUnicode_AsUTF8String(anchor_object)
                if not PyString_CheckExact(anchor_object):
                    if PY_MAJOR_VERSION < 3:
                        raise TypeError("anchor must be a string")
                    else:
                        raise TypeError(u"anchor must be a string")
                anchor = PyString_AS_STRING(anchor_object)
            tag = NULL
            tag_object = event_object.tag
            if tag_object is not None:
                if PyUnicode_CheckExact(tag_object):
                    tag_object = PyUnicode_AsUTF8String(tag_object)
                if not PyString_CheckExact(tag_object):
                    if PY_MAJOR_VERSION < 3:
                        raise TypeError("tag must be a string")
                    else:
                        raise TypeError(u"tag must be a string")
                tag = PyString_AS_STRING(tag_object)
            implicit = 0
            if event_object.implicit:
                implicit = 1
            sequence_style = YAML_BLOCK_SEQUENCE_STYLE
            if event_object.flow_style:
                sequence_style = YAML_FLOW_SEQUENCE_STYLE
            if yaml_sequence_start_event_initialize(event, anchor, tag,
                    implicit, sequence_style) == 0:
                raise MemoryError
        elif event_class is MappingStartEvent:
            anchor = NULL
            anchor_object = event_object.anchor
            if anchor_object is not None:
                if PyUnicode_CheckExact(anchor_object):
                    anchor_object = PyUnicode_AsUTF8String(anchor_object)
                if not PyString_CheckExact(anchor_object):
                    if PY_MAJOR_VERSION < 3:
                        raise TypeError("anchor must be a string")
                    else:
                        raise TypeError(u"anchor must be a string")
                anchor = PyString_AS_STRING(anchor_object)
            tag = NULL
            tag_object = event_object.tag
            if tag_object is not None:
                if PyUnicode_CheckExact(tag_object):
                    tag_object = PyUnicode_AsUTF8String(tag_object)
                if not PyString_CheckExact(tag_object):
                    if PY_MAJOR_VERSION < 3:
                        raise TypeError("tag must be a string")
                    else:
                        raise TypeError(u"tag must be a string")
                tag = PyString_AS_STRING(tag_object)
            implicit = 0
            if event_object.implicit:
                implicit = 1
            mapping_style = YAML_BLOCK_MAPPING_STYLE
            if event_object.flow_style:
                mapping_style = YAML_FLOW_MAPPING_STYLE
            if yaml_mapping_start_event_initialize(event, anchor, tag,
                    implicit, mapping_style) == 0:
                raise MemoryError
        elif event_class is SequenceEndEvent:
            yaml_sequence_end_event_initialize(event)
        elif event_class is MappingEndEvent:
            yaml_mapping_end_event_initialize(event)
        else:
            if PY_MAJOR_VERSION < 3:
                raise TypeError("invalid event %s" % event_object)
            else:
                raise TypeError(u"invalid event %s" % event_object)
        return 1

    def emit(self, event_object):
        cdef yaml_event_t event
        self._object_to_event(event_object, &event)
        if yaml_emitter_emit(&self.emitter, &event) == 0:
            error = self._emitter_error()
            raise error

    def open(self):
        cdef yaml_event_t event
        cdef yaml_encoding_t encoding
        if self.closed == -1:
            if self.use_encoding == u'utf-16-le' or self.use_encoding == 'utf-16-le':
                encoding = YAML_UTF16LE_ENCODING
            elif self.use_encoding == u'utf-16-be' or self.use_encoding == 'utf-16-be':
                encoding = YAML_UTF16BE_ENCODING
            else:
                encoding = YAML_UTF8_ENCODING
            if self.use_encoding is None:
                self.dump_unicode = 1
            if self.dump_unicode == 1:
                encoding = YAML_UTF8_ENCODING
            yaml_stream_start_event_initialize(&event, encoding)
            if yaml_emitter_emit(&self.emitter, &event) == 0:
                error = self._emitter_error()
                raise error
            self.closed = 0
        elif self.closed == 1:
            if PY_MAJOR_VERSION < 3:
                raise SerializerError("serializer is closed")
            else:
                raise SerializerError(u"serializer is closed")
        else:
            if PY_MAJOR_VERSION < 3:
                raise SerializerError("serializer is already opened")
            else:
                raise SerializerError(u"serializer is already opened")

    def close(self):
        cdef yaml_event_t event
        if self.closed == -1:
            if PY_MAJOR_VERSION < 3:
                raise SerializerError("serializer is not opened")
            else:
                raise SerializerError(u"serializer is not opened")
        elif self.closed == 0:
            yaml_stream_end_event_initialize(&event)
            if yaml_emitter_emit(&self.emitter, &event) == 0:
                error = self._emitter_error()
                raise error
            self.closed = 1

    def serialize(self, node):
        cdef yaml_event_t event
        cdef yaml_version_directive_t version_directive_value
        cdef yaml_version_directive_t *version_directive
        cdef yaml_tag_directive_t tag_directives_value[128]
        cdef yaml_tag_directive_t *tag_directives_start
        cdef yaml_tag_directive_t *tag_directives_end
        if self.closed == -1:
            if PY_MAJOR_VERSION < 3:
                raise SerializerError("serializer is not opened")
            else:
                raise SerializerError(u"serializer is not opened")
        elif self.closed == 1:
            if PY_MAJOR_VERSION < 3:
                raise SerializerError("serializer is closed")
            else:
                raise SerializerError(u"serializer is closed")
        cache = []
        version_directive = NULL
        if self.use_version:
            version_directive_value.major = self.use_version[0]
            version_directive_value.minor = self.use_version[1]
            version_directive = &version_directive_value
        tag_directives_start = NULL
        tag_directives_end = NULL
        if self.use_tags:
            if len(self.use_tags) > 128:
                if PY_MAJOR_VERSION < 3:
                    raise ValueError("too many tags")
                else:
                    raise ValueError(u"too many tags")
            tag_directives_start = tag_directives_value
            tag_directives_end = tag_directives_value
            for handle in self.use_tags:
                prefix = self.use_tags[handle]
                if PyUnicode_CheckExact(handle):
                    handle = PyUnicode_AsUTF8String(handle)
                    cache.append(handle)
                if not PyString_CheckExact(handle):
                    if PY_MAJOR_VERSION < 3:
                        raise TypeError("tag handle must be a string")
                    else:
                        raise TypeError(u"tag handle must be a string")
                tag_directives_end.handle = PyString_AS_STRING(handle)
                if PyUnicode_CheckExact(prefix):
                    prefix = PyUnicode_AsUTF8String(prefix)
                    cache.append(prefix)
                if not PyString_CheckExact(prefix):
                    if PY_MAJOR_VERSION < 3:
                        raise TypeError("tag prefix must be a string")
                    else:
                        raise TypeError(u"tag prefix must be a string")
                tag_directives_end.prefix = PyString_AS_STRING(prefix)
                tag_directives_end = tag_directives_end+1
        if yaml_document_start_event_initialize(&event, version_directive,
                tag_directives_start, tag_directives_end,
                self.document_start_implicit) == 0:
            raise MemoryError
        if yaml_emitter_emit(&self.emitter, &event) == 0:
            error = self._emitter_error()
            raise error
        self._anchor_node(node)
        self._serialize_node(node, None, None)
        yaml_document_end_event_initialize(&event, self.document_end_implicit)
        if yaml_emitter_emit(&self.emitter, &event) == 0:
            error = self._emitter_error()
            raise error
        self.serialized_nodes = {}
        self.anchors = {}
        self.last_alias_id = 0

    cdef int _anchor_node(self, object node) except 0:
        if node in self.anchors:
            if self.anchors[node] is None:
                self.last_alias_id = self.last_alias_id+1
                self.anchors[node] = u"id%03d" % self.last_alias_id
        else:
            self.anchors[node] = None
            node_class = node.__class__
            if node_class is SequenceNode:
                for item in node.value:
                    self._anchor_node(item)
            elif node_class is MappingNode:
                for key, value in node.value:
                    self._anchor_node(key)
                    self._anchor_node(value)
        return 1

    cdef int _serialize_node(self, object node, object parent, object index) except 0:
        cdef yaml_event_t event
        cdef int implicit
        cdef int plain_implicit
        cdef int quoted_implicit
        cdef char *anchor
        cdef char *tag
        cdef char *value
        cdef int length
        cdef int item_index
        cdef yaml_scalar_style_t scalar_style
        cdef yaml_sequence_style_t sequence_style
        cdef yaml_mapping_style_t mapping_style
        anchor_object = self.anchors[node]
        anchor = NULL
        if anchor_object is not None:
            if PyUnicode_CheckExact(anchor_object):
                anchor_object = PyUnicode_AsUTF8String(anchor_object)
            if not PyString_CheckExact(anchor_object):
                if PY_MAJOR_VERSION < 3:
                    raise TypeError("anchor must be a string")
                else:
                    raise TypeError(u"anchor must be a string")
            anchor = PyString_AS_STRING(anchor_object)
        if node in self.serialized_nodes:
            if yaml_alias_event_initialize(&event, anchor) == 0:
                raise MemoryError
            if yaml_emitter_emit(&self.emitter, &event) == 0:
                error = self._emitter_error()
                raise error
        else:
            node_class = node.__class__
            self.serialized_nodes[node] = True
            self.descend_resolver(parent, index)
            if node_class is ScalarNode:
                plain_implicit = 0
                quoted_implicit = 0
                tag_object = node.tag
                if self.resolve(ScalarNode, node.value, (True, False)) == tag_object:
                    plain_implicit = 1
                if self.resolve(ScalarNode, node.value, (False, True)) == tag_object:
                    quoted_implicit = 1
                tag = NULL
                if tag_object is not None:
                    if PyUnicode_CheckExact(tag_object):
                        tag_object = PyUnicode_AsUTF8String(tag_object)
                    if not PyString_CheckExact(tag_object):
                        if PY_MAJOR_VERSION < 3:
                            raise TypeError("tag must be a string")
                        else:
                            raise TypeError(u"tag must be a string")
                    tag = PyString_AS_STRING(tag_object)
                value_object = node.value
                if PyUnicode_CheckExact(value_object):
                    value_object = PyUnicode_AsUTF8String(value_object)
                if not PyString_CheckExact(value_object):
                    if PY_MAJOR_VERSION < 3:
                        raise TypeError("value must be a string")
                    else:
                        raise TypeError(u"value must be a string")
                value = PyString_AS_STRING(value_object)
                length = PyString_GET_SIZE(value_object)
                style_object = node.style
                scalar_style = YAML_PLAIN_SCALAR_STYLE
                if style_object == "'" or style_object == u"'":
                    scalar_style = YAML_SINGLE_QUOTED_SCALAR_STYLE
                elif style_object == "\"" or style_object == u"\"":
                    scalar_style = YAML_DOUBLE_QUOTED_SCALAR_STYLE
                elif style_object == "|" or style_object == u"|":
                    scalar_style = YAML_LITERAL_SCALAR_STYLE
                elif style_object == ">" or style_object == u">":
                    scalar_style = YAML_FOLDED_SCALAR_STYLE
                if yaml_scalar_event_initialize(&event, anchor, tag, value, length,
                        plain_implicit, quoted_implicit, scalar_style) == 0:
                    raise MemoryError
                if yaml_emitter_emit(&self.emitter, &event) == 0:
                    error = self._emitter_error()
                    raise error
            elif node_class is SequenceNode:
                implicit = 0
                tag_object = node.tag
                if self.resolve(SequenceNode, node.value, True) == tag_object:
                    implicit = 1
                tag = NULL
                if tag_object is not None:
                    if PyUnicode_CheckExact(tag_object):
                        tag_object = PyUnicode_AsUTF8String(tag_object)
                    if not PyString_CheckExact(tag_object):
                        if PY_MAJOR_VERSION < 3:
                            raise TypeError("tag must be a string")
                        else:
                            raise TypeError(u"tag must be a string")
                    tag = PyString_AS_STRING(tag_object)
                sequence_style = YAML_BLOCK_SEQUENCE_STYLE
                if node.flow_style:
                    sequence_style = YAML_FLOW_SEQUENCE_STYLE
                if yaml_sequence_start_event_initialize(&event, anchor, tag,
                        implicit, sequence_style) == 0:
                    raise MemoryError
                if yaml_emitter_emit(&self.emitter, &event) == 0:
                    error = self._emitter_error()
                    raise error
                item_index = 0
                for item in node.value:
                    self._serialize_node(item, node, item_index)
                    item_index = item_index+1
                yaml_sequence_end_event_initialize(&event)
                if yaml_emitter_emit(&self.emitter, &event) == 0:
                    error = self._emitter_error()
                    raise error
            elif node_class is MappingNode:
                implicit = 0
                tag_object = node.tag
                if self.resolve(MappingNode, node.value, True) == tag_object:
                    implicit = 1
                tag = NULL
                if tag_object is not None:
                    if PyUnicode_CheckExact(tag_object):
                        tag_object = PyUnicode_AsUTF8String(tag_object)
                    if not PyString_CheckExact(tag_object):
                        if PY_MAJOR_VERSION < 3:
                            raise TypeError("tag must be a string")
                        else:
                            raise TypeError(u"tag must be a string")
                    tag = PyString_AS_STRING(tag_object)
                mapping_style = YAML_BLOCK_MAPPING_STYLE
                if node.flow_style:
                    mapping_style = YAML_FLOW_MAPPING_STYLE
                if yaml_mapping_start_event_initialize(&event, anchor, tag,
                        implicit, mapping_style) == 0:
                    raise MemoryError
                if yaml_emitter_emit(&self.emitter, &event) == 0:
                    error = self._emitter_error()
                    raise error
                for item_key, item_value in node.value:
                    self._serialize_node(item_key, node, None)
                    self._serialize_node(item_value, node, item_key)
                yaml_mapping_end_event_initialize(&event)
                if yaml_emitter_emit(&self.emitter, &event) == 0:
                    error = self._emitter_error()
                    raise error
            self.ascend_resolver()
        return 1

cdef int output_handler(void *data, char *buffer, int size) except 0:
    cdef CEmitter emitter
    emitter = <CEmitter>data
    if emitter.dump_unicode == 0:
        value = PyString_FromStringAndSize(buffer, size)
    else:
        value = PyUnicode_DecodeUTF8(buffer, size, 'strict')
    emitter.stream.write(value)
    return 1