File: decoder.py

package info (click to toggle)
python-toml 0.10.1-1
  • links: PTS, VCS
  • area: main
  • in suites: bookworm, bullseye, sid
  • size: 216 kB
  • sloc: python: 1,482; makefile: 7; sh: 6
file content (1052 lines) | stat: -rw-r--r-- 38,684 bytes parent folder | download
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
import datetime
import io
from os import linesep
import re
import sys

from toml.tz import TomlTz

if sys.version_info < (3,):
    _range = xrange  # noqa: F821
else:
    unicode = str
    _range = range
    basestring = str
    unichr = chr


def _detect_pathlib_path(p):
    if (3, 4) <= sys.version_info:
        import pathlib
        if isinstance(p, pathlib.PurePath):
            return True
    return False


def _ispath(p):
    if isinstance(p, (bytes, basestring)):
        return True
    return _detect_pathlib_path(p)


def _getpath(p):
    if (3, 6) <= sys.version_info:
        import os
        return os.fspath(p)
    if _detect_pathlib_path(p):
        return str(p)
    return p


try:
    FNFError = FileNotFoundError
except NameError:
    FNFError = IOError


TIME_RE = re.compile(r"([0-9]{2}):([0-9]{2}):([0-9]{2})(\.([0-9]{3,6}))?")


class TomlDecodeError(ValueError):
    """Base toml Exception / Error."""

    def __init__(self, msg, doc, pos):
        lineno = doc.count('\n', 0, pos) + 1
        colno = pos - doc.rfind('\n', 0, pos)
        emsg = '{} (line {} column {} char {})'.format(msg, lineno, colno, pos)
        ValueError.__init__(self, emsg)
        self.msg = msg
        self.doc = doc
        self.pos = pos
        self.lineno = lineno
        self.colno = colno


# Matches a TOML number, which allows underscores for readability
_number_with_underscores = re.compile('([0-9])(_([0-9]))*')


class CommentValue(object):
    def __init__(self, val, comment, beginline, _dict):
        self.val = val
        separator = "\n" if beginline else " "
        self.comment = separator + comment
        self._dict = _dict

    def __getitem__(self, key):
        return self.val[key]

    def __setitem__(self, key, value):
        self.val[key] = value

    def dump(self, dump_value_func):
        retstr = dump_value_func(self.val)
        if isinstance(self.val, self._dict):
            return self.comment + "\n" + unicode(retstr)
        else:
            return unicode(retstr) + self.comment


def _strictly_valid_num(n):
    n = n.strip()
    if not n:
        return False
    if n[0] == '_':
        return False
    if n[-1] == '_':
        return False
    if "_." in n or "._" in n:
        return False
    if len(n) == 1:
        return True
    if n[0] == '0' and n[1] not in ['.', 'o', 'b', 'x']:
        return False
    if n[0] == '+' or n[0] == '-':
        n = n[1:]
        if len(n) > 1 and n[0] == '0' and n[1] != '.':
            return False
    if '__' in n:
        return False
    return True


def load(f, _dict=dict, decoder=None):
    """Parses named file or files as toml and returns a dictionary

    Args:
        f: Path to the file to open, array of files to read into single dict
           or a file descriptor
        _dict: (optional) Specifies the class of the returned toml dictionary
        decoder: The decoder to use

    Returns:
        Parsed toml file represented as a dictionary

    Raises:
        TypeError -- When f is invalid type
        TomlDecodeError: Error while decoding toml
        IOError / FileNotFoundError -- When an array with no valid (existing)
        (Python 2 / Python 3)          file paths is passed
    """

    if _ispath(f):
        with io.open(_getpath(f), encoding='utf-8') as ffile:
            return loads(ffile.read(), _dict, decoder)
    elif isinstance(f, list):
        from os import path as op
        from warnings import warn
        if not [path for path in f if op.exists(path)]:
            error_msg = "Load expects a list to contain filenames only."
            error_msg += linesep
            error_msg += ("The list needs to contain the path of at least one "
                          "existing file.")
            raise FNFError(error_msg)
        if decoder is None:
            decoder = TomlDecoder(_dict)
        d = decoder.get_empty_table()
        for l in f:  # noqa: E741
            if op.exists(l):
                d.update(load(l, _dict, decoder))
            else:
                warn("Non-existent filename in list with at least one valid "
                     "filename")
        return d
    else:
        try:
            return loads(f.read(), _dict, decoder)
        except AttributeError:
            raise TypeError("You can only load a file descriptor, filename or "
                            "list")


_groupname_re = re.compile(r'^[A-Za-z0-9_-]+$')


def loads(s, _dict=dict, decoder=None):
    """Parses string as toml

    Args:
        s: String to be parsed
        _dict: (optional) Specifies the class of the returned toml dictionary

    Returns:
        Parsed toml file represented as a dictionary

    Raises:
        TypeError: When a non-string is passed
        TomlDecodeError: Error while decoding toml
    """

    implicitgroups = []
    if decoder is None:
        decoder = TomlDecoder(_dict)
    retval = decoder.get_empty_table()
    currentlevel = retval
    if not isinstance(s, basestring):
        raise TypeError("Expecting something like a string")

    if not isinstance(s, unicode):
        s = s.decode('utf8')

    original = s
    sl = list(s)
    openarr = 0
    openstring = False
    openstrchar = ""
    multilinestr = False
    arrayoftables = False
    beginline = True
    keygroup = False
    dottedkey = False
    keyname = 0
    key = ''
    prev_key = ''
    line_no = 1

    for i, item in enumerate(sl):
        if item == '\r' and sl[i + 1] == '\n':
            sl[i] = ' '
            continue
        if keyname:
            key += item
            if item == '\n':
                raise TomlDecodeError("Key name found without value."
                                      " Reached end of line.", original, i)
            if openstring:
                if item == openstrchar:
                    oddbackslash = False
                    k = 1
                    while i >= k and sl[i - k] == '\\':
                        oddbackslash = not oddbackslash
                        k += 1
                    if not oddbackslash:
                        keyname = 2
                        openstring = False
                        openstrchar = ""
                continue
            elif keyname == 1:
                if item.isspace():
                    keyname = 2
                    continue
                elif item == '.':
                    dottedkey = True
                    continue
                elif item.isalnum() or item == '_' or item == '-':
                    continue
                elif (dottedkey and sl[i - 1] == '.' and
                      (item == '"' or item == "'")):
                    openstring = True
                    openstrchar = item
                    continue
            elif keyname == 2:
                if item.isspace():
                    if dottedkey:
                        nextitem = sl[i + 1]
                        if not nextitem.isspace() and nextitem != '.':
                            keyname = 1
                    continue
                if item == '.':
                    dottedkey = True
                    nextitem = sl[i + 1]
                    if not nextitem.isspace() and nextitem != '.':
                        keyname = 1
                    continue
            if item == '=':
                keyname = 0
                prev_key = key[:-1].rstrip()
                key = ''
                dottedkey = False
            else:
                raise TomlDecodeError("Found invalid character in key name: '" +
                                      item + "'. Try quoting the key name.",
                                      original, i)
        if item == "'" and openstrchar != '"':
            k = 1
            try:
                while sl[i - k] == "'":
                    k += 1
                    if k == 3:
                        break
            except IndexError:
                pass
            if k == 3:
                multilinestr = not multilinestr
                openstring = multilinestr
            else:
                openstring = not openstring
            if openstring:
                openstrchar = "'"
            else:
                openstrchar = ""
        if item == '"' and openstrchar != "'":
            oddbackslash = False
            k = 1
            tripquote = False
            try:
                while sl[i - k] == '"':
                    k += 1
                    if k == 3:
                        tripquote = True
                        break
                if k == 1 or (k == 3 and tripquote):
                    while sl[i - k] == '\\':
                        oddbackslash = not oddbackslash
                        k += 1
            except IndexError:
                pass
            if not oddbackslash:
                if tripquote:
                    multilinestr = not multilinestr
                    openstring = multilinestr
                else:
                    openstring = not openstring
            if openstring:
                openstrchar = '"'
            else:
                openstrchar = ""
        if item == '#' and (not openstring and not keygroup and
                            not arrayoftables):
            j = i
            comment = ""
            try:
                while sl[j] != '\n':
                    comment += s[j]
                    sl[j] = ' '
                    j += 1
            except IndexError:
                break
            if not openarr:
                decoder.preserve_comment(line_no, prev_key, comment, beginline)
        if item == '[' and (not openstring and not keygroup and
                            not arrayoftables):
            if beginline:
                if len(sl) > i + 1 and sl[i + 1] == '[':
                    arrayoftables = True
                else:
                    keygroup = True
            else:
                openarr += 1
        if item == ']' and not openstring:
            if keygroup:
                keygroup = False
            elif arrayoftables:
                if sl[i - 1] == ']':
                    arrayoftables = False
            else:
                openarr -= 1
        if item == '\n':
            if openstring or multilinestr:
                if not multilinestr:
                    raise TomlDecodeError("Unbalanced quotes", original, i)
                if ((sl[i - 1] == "'" or sl[i - 1] == '"') and (
                        sl[i - 2] == sl[i - 1])):
                    sl[i] = sl[i - 1]
                    if sl[i - 3] == sl[i - 1]:
                        sl[i - 3] = ' '
            elif openarr:
                sl[i] = ' '
            else:
                beginline = True
            line_no += 1
        elif beginline and sl[i] != ' ' and sl[i] != '\t':
            beginline = False
            if not keygroup and not arrayoftables:
                if sl[i] == '=':
                    raise TomlDecodeError("Found empty keyname. ", original, i)
                keyname = 1
                key += item
    if keyname:
        raise TomlDecodeError("Key name found without value."
                              " Reached end of file.", original, len(s))
    if openstring:  # reached EOF and have an unterminated string
        raise TomlDecodeError("Unterminated string found."
                              " Reached end of file.", original, len(s))
    s = ''.join(sl)
    s = s.split('\n')
    multikey = None
    multilinestr = ""
    multibackslash = False
    pos = 0
    for idx, line in enumerate(s):
        if idx > 0:
            pos += len(s[idx - 1]) + 1

        decoder.embed_comments(idx, currentlevel)

        if not multilinestr or multibackslash or '\n' not in multilinestr:
            line = line.strip()
        if line == "" and (not multikey or multibackslash):
            continue
        if multikey:
            if multibackslash:
                multilinestr += line
            else:
                multilinestr += line
            multibackslash = False
            closed = False
            if multilinestr[0] == '[':
                closed = line[-1] == ']'
            elif len(line) > 2:
                closed = (line[-1] == multilinestr[0] and
                          line[-2] == multilinestr[0] and
                          line[-3] == multilinestr[0])
            if closed:
                try:
                    value, vtype = decoder.load_value(multilinestr)
                except ValueError as err:
                    raise TomlDecodeError(str(err), original, pos)
                currentlevel[multikey] = value
                multikey = None
                multilinestr = ""
            else:
                k = len(multilinestr) - 1
                while k > -1 and multilinestr[k] == '\\':
                    multibackslash = not multibackslash
                    k -= 1
                if multibackslash:
                    multilinestr = multilinestr[:-1]
                else:
                    multilinestr += "\n"
            continue
        if line[0] == '[':
            arrayoftables = False
            if len(line) == 1:
                raise TomlDecodeError("Opening key group bracket on line by "
                                      "itself.", original, pos)
            if line[1] == '[':
                arrayoftables = True
                line = line[2:]
                splitstr = ']]'
            else:
                line = line[1:]
                splitstr = ']'
            i = 1
            quotesplits = decoder._get_split_on_quotes(line)
            quoted = False
            for quotesplit in quotesplits:
                if not quoted and splitstr in quotesplit:
                    break
                i += quotesplit.count(splitstr)
                quoted = not quoted
            line = line.split(splitstr, i)
            if len(line) < i + 1 or line[-1].strip() != "":
                raise TomlDecodeError("Key group not on a line by itself.",
                                      original, pos)
            groups = splitstr.join(line[:-1]).split('.')
            i = 0
            while i < len(groups):
                groups[i] = groups[i].strip()
                if len(groups[i]) > 0 and (groups[i][0] == '"' or
                                           groups[i][0] == "'"):
                    groupstr = groups[i]
                    j = i + 1
                    while not groupstr[0] == groupstr[-1]:
                        j += 1
                        if j > len(groups) + 2:
                            raise TomlDecodeError("Invalid group name '" +
                                                  groupstr + "' Something " +
                                                  "went wrong.", original, pos)
                        groupstr = '.'.join(groups[i:j]).strip()
                    groups[i] = groupstr[1:-1]
                    groups[i + 1:j] = []
                else:
                    if not _groupname_re.match(groups[i]):
                        raise TomlDecodeError("Invalid group name '" +
                                              groups[i] + "'. Try quoting it.",
                                              original, pos)
                i += 1
            currentlevel = retval
            for i in _range(len(groups)):
                group = groups[i]
                if group == "":
                    raise TomlDecodeError("Can't have a keygroup with an empty "
                                          "name", original, pos)
                try:
                    currentlevel[group]
                    if i == len(groups) - 1:
                        if group in implicitgroups:
                            implicitgroups.remove(group)
                            if arrayoftables:
                                raise TomlDecodeError("An implicitly defined "
                                                      "table can't be an array",
                                                      original, pos)
                        elif arrayoftables:
                            currentlevel[group].append(decoder.get_empty_table()
                                                       )
                        else:
                            raise TomlDecodeError("What? " + group +
                                                  " already exists?" +
                                                  str(currentlevel),
                                                  original, pos)
                except TypeError:
                    currentlevel = currentlevel[-1]
                    if group not in currentlevel:
                        currentlevel[group] = decoder.get_empty_table()
                        if i == len(groups) - 1 and arrayoftables:
                            currentlevel[group] = [decoder.get_empty_table()]
                except KeyError:
                    if i != len(groups) - 1:
                        implicitgroups.append(group)
                    currentlevel[group] = decoder.get_empty_table()
                    if i == len(groups) - 1 and arrayoftables:
                        currentlevel[group] = [decoder.get_empty_table()]
                currentlevel = currentlevel[group]
                if arrayoftables:
                    try:
                        currentlevel = currentlevel[-1]
                    except KeyError:
                        pass
        elif line[0] == "{":
            if line[-1] != "}":
                raise TomlDecodeError("Line breaks are not allowed in inline"
                                      "objects", original, pos)
            try:
                decoder.load_inline_object(line, currentlevel, multikey,
                                           multibackslash)
            except ValueError as err:
                raise TomlDecodeError(str(err), original, pos)
        elif "=" in line:
            try:
                ret = decoder.load_line(line, currentlevel, multikey,
                                        multibackslash)
            except ValueError as err:
                raise TomlDecodeError(str(err), original, pos)
            if ret is not None:
                multikey, multilinestr, multibackslash = ret
    return retval


def _load_date(val):
    microsecond = 0
    tz = None
    try:
        if len(val) > 19:
            if val[19] == '.':
                if val[-1].upper() == 'Z':
                    subsecondval = val[20:-1]
                    tzval = "Z"
                else:
                    subsecondvalandtz = val[20:]
                    if '+' in subsecondvalandtz:
                        splitpoint = subsecondvalandtz.index('+')
                        subsecondval = subsecondvalandtz[:splitpoint]
                        tzval = subsecondvalandtz[splitpoint:]
                    elif '-' in subsecondvalandtz:
                        splitpoint = subsecondvalandtz.index('-')
                        subsecondval = subsecondvalandtz[:splitpoint]
                        tzval = subsecondvalandtz[splitpoint:]
                    else:
                        tzval = None
                        subsecondval = subsecondvalandtz
                if tzval is not None:
                    tz = TomlTz(tzval)
                microsecond = int(int(subsecondval) *
                                  (10 ** (6 - len(subsecondval))))
            else:
                tz = TomlTz(val[19:])
    except ValueError:
        tz = None
    if "-" not in val[1:]:
        return None
    try:
        if len(val) == 10:
            d = datetime.date(
                int(val[:4]), int(val[5:7]),
                int(val[8:10]))
        else:
            d = datetime.datetime(
                int(val[:4]), int(val[5:7]),
                int(val[8:10]), int(val[11:13]),
                int(val[14:16]), int(val[17:19]), microsecond, tz)
    except ValueError:
        return None
    return d


def _load_unicode_escapes(v, hexbytes, prefix):
    skip = False
    i = len(v) - 1
    while i > -1 and v[i] == '\\':
        skip = not skip
        i -= 1
    for hx in hexbytes:
        if skip:
            skip = False
            i = len(hx) - 1
            while i > -1 and hx[i] == '\\':
                skip = not skip
                i -= 1
            v += prefix
            v += hx
            continue
        hxb = ""
        i = 0
        hxblen = 4
        if prefix == "\\U":
            hxblen = 8
        hxb = ''.join(hx[i:i + hxblen]).lower()
        if hxb.strip('0123456789abcdef'):
            raise ValueError("Invalid escape sequence: " + hxb)
        if hxb[0] == "d" and hxb[1].strip('01234567'):
            raise ValueError("Invalid escape sequence: " + hxb +
                             ". Only scalar unicode points are allowed.")
        v += unichr(int(hxb, 16))
        v += unicode(hx[len(hxb):])
    return v


# Unescape TOML string values.

# content after the \
_escapes = ['0', 'b', 'f', 'n', 'r', 't', '"']
# What it should be replaced by
_escapedchars = ['\0', '\b', '\f', '\n', '\r', '\t', '\"']
# Used for substitution
_escape_to_escapedchars = dict(zip(_escapes, _escapedchars))


def _unescape(v):
    """Unescape characters in a TOML string."""
    i = 0
    backslash = False
    while i < len(v):
        if backslash:
            backslash = False
            if v[i] in _escapes:
                v = v[:i - 1] + _escape_to_escapedchars[v[i]] + v[i + 1:]
            elif v[i] == '\\':
                v = v[:i - 1] + v[i:]
            elif v[i] == 'u' or v[i] == 'U':
                i += 1
            else:
                raise ValueError("Reserved escape sequence used")
            continue
        elif v[i] == '\\':
            backslash = True
        i += 1
    return v


class InlineTableDict(object):
    """Sentinel subclass of dict for inline tables."""


class TomlDecoder(object):

    def __init__(self, _dict=dict):
        self._dict = _dict

    def get_empty_table(self):
        return self._dict()

    def get_empty_inline_table(self):
        class DynamicInlineTableDict(self._dict, InlineTableDict):
            """Concrete sentinel subclass for inline tables.
            It is a subclass of _dict which is passed in dynamically at load
            time

            It is also a subclass of InlineTableDict
            """

        return DynamicInlineTableDict()

    def load_inline_object(self, line, currentlevel, multikey=False,
                           multibackslash=False):
        candidate_groups = line[1:-1].split(",")
        groups = []
        if len(candidate_groups) == 1 and not candidate_groups[0].strip():
            candidate_groups.pop()
        while len(candidate_groups) > 0:
            candidate_group = candidate_groups.pop(0)
            try:
                _, value = candidate_group.split('=', 1)
            except ValueError:
                raise ValueError("Invalid inline table encountered")
            value = value.strip()
            if ((value[0] == value[-1] and value[0] in ('"', "'")) or (
                    value[0] in '-0123456789' or
                    value in ('true', 'false') or
                    (value[0] == "[" and value[-1] == "]") or
                    (value[0] == '{' and value[-1] == '}'))):
                groups.append(candidate_group)
            elif len(candidate_groups) > 0:
                candidate_groups[0] = (candidate_group + "," +
                                       candidate_groups[0])
            else:
                raise ValueError("Invalid inline table value encountered")
        for group in groups:
            status = self.load_line(group, currentlevel, multikey,
                                    multibackslash)
            if status is not None:
                break

    def _get_split_on_quotes(self, line):
        doublequotesplits = line.split('"')
        quoted = False
        quotesplits = []
        if len(doublequotesplits) > 1 and "'" in doublequotesplits[0]:
            singlequotesplits = doublequotesplits[0].split("'")
            doublequotesplits = doublequotesplits[1:]
            while len(singlequotesplits) % 2 == 0 and len(doublequotesplits):
                singlequotesplits[-1] += '"' + doublequotesplits[0]
                doublequotesplits = doublequotesplits[1:]
                if "'" in singlequotesplits[-1]:
                    singlequotesplits = (singlequotesplits[:-1] +
                                         singlequotesplits[-1].split("'"))
            quotesplits += singlequotesplits
        for doublequotesplit in doublequotesplits:
            if quoted:
                quotesplits.append(doublequotesplit)
            else:
                quotesplits += doublequotesplit.split("'")
                quoted = not quoted
        return quotesplits

    def load_line(self, line, currentlevel, multikey, multibackslash):
        i = 1
        quotesplits = self._get_split_on_quotes(line)
        quoted = False
        for quotesplit in quotesplits:
            if not quoted and '=' in quotesplit:
                break
            i += quotesplit.count('=')
            quoted = not quoted
        pair = line.split('=', i)
        strictly_valid = _strictly_valid_num(pair[-1])
        if _number_with_underscores.match(pair[-1]):
            pair[-1] = pair[-1].replace('_', '')
        while len(pair[-1]) and (pair[-1][0] != ' ' and pair[-1][0] != '\t' and
                                 pair[-1][0] != "'" and pair[-1][0] != '"' and
                                 pair[-1][0] != '[' and pair[-1][0] != '{' and
                                 pair[-1].strip() != 'true' and
                                 pair[-1].strip() != 'false'):
            try:
                float(pair[-1])
                break
            except ValueError:
                pass
            if _load_date(pair[-1]) is not None:
                break
            if TIME_RE.match(pair[-1]):
                break
            i += 1
            prev_val = pair[-1]
            pair = line.split('=', i)
            if prev_val == pair[-1]:
                raise ValueError("Invalid date or number")
            if strictly_valid:
                strictly_valid = _strictly_valid_num(pair[-1])
        pair = ['='.join(pair[:-1]).strip(), pair[-1].strip()]
        if '.' in pair[0]:
            if '"' in pair[0] or "'" in pair[0]:
                quotesplits = self._get_split_on_quotes(pair[0])
                quoted = False
                levels = []
                for quotesplit in quotesplits:
                    if quoted:
                        levels.append(quotesplit)
                    else:
                        levels += [level.strip() for level in
                                   quotesplit.split('.')]
                    quoted = not quoted
            else:
                levels = pair[0].split('.')
            while levels[-1] == "":
                levels = levels[:-1]
            for level in levels[:-1]:
                if level == "":
                    continue
                if level not in currentlevel:
                    currentlevel[level] = self.get_empty_table()
                currentlevel = currentlevel[level]
            pair[0] = levels[-1].strip()
        elif (pair[0][0] == '"' or pair[0][0] == "'") and \
                (pair[0][-1] == pair[0][0]):
            pair[0] = _unescape(pair[0][1:-1])
        k, koffset = self._load_line_multiline_str(pair[1])
        if k > -1:
            while k > -1 and pair[1][k + koffset] == '\\':
                multibackslash = not multibackslash
                k -= 1
            if multibackslash:
                multilinestr = pair[1][:-1]
            else:
                multilinestr = pair[1] + "\n"
            multikey = pair[0]
        else:
            value, vtype = self.load_value(pair[1], strictly_valid)
        try:
            currentlevel[pair[0]]
            raise ValueError("Duplicate keys!")
        except TypeError:
            raise ValueError("Duplicate keys!")
        except KeyError:
            if multikey:
                return multikey, multilinestr, multibackslash
            else:
                currentlevel[pair[0]] = value

    def _load_line_multiline_str(self, p):
        poffset = 0
        if len(p) < 3:
            return -1, poffset
        if p[0] == '[' and (p.strip()[-1] != ']' and
                            self._load_array_isstrarray(p)):
            newp = p[1:].strip().split(',')
            while len(newp) > 1 and newp[-1][0] != '"' and newp[-1][0] != "'":
                newp = newp[:-2] + [newp[-2] + ',' + newp[-1]]
            newp = newp[-1]
            poffset = len(p) - len(newp)
            p = newp
        if p[0] != '"' and p[0] != "'":
            return -1, poffset
        if p[1] != p[0] or p[2] != p[0]:
            return -1, poffset
        if len(p) > 5 and p[-1] == p[0] and p[-2] == p[0] and p[-3] == p[0]:
            return -1, poffset
        return len(p) - 1, poffset

    def load_value(self, v, strictly_valid=True):
        if not v:
            raise ValueError("Empty value is invalid")
        if v == 'true':
            return (True, "bool")
        elif v == 'false':
            return (False, "bool")
        elif v[0] == '"' or v[0] == "'":
            quotechar = v[0]
            testv = v[1:].split(quotechar)
            triplequote = False
            triplequotecount = 0
            if len(testv) > 1 and testv[0] == '' and testv[1] == '':
                testv = testv[2:]
                triplequote = True
            closed = False
            for tv in testv:
                if tv == '':
                    if triplequote:
                        triplequotecount += 1
                    else:
                        closed = True
                else:
                    oddbackslash = False
                    try:
                        i = -1
                        j = tv[i]
                        while j == '\\':
                            oddbackslash = not oddbackslash
                            i -= 1
                            j = tv[i]
                    except IndexError:
                        pass
                    if not oddbackslash:
                        if closed:
                            raise ValueError("Found tokens after a closed " +
                                             "string. Invalid TOML.")
                        else:
                            if not triplequote or triplequotecount > 1:
                                closed = True
                            else:
                                triplequotecount = 0
            if quotechar == '"':
                escapeseqs = v.split('\\')[1:]
                backslash = False
                for i in escapeseqs:
                    if i == '':
                        backslash = not backslash
                    else:
                        if i[0] not in _escapes and (i[0] != 'u' and
                                                     i[0] != 'U' and
                                                     not backslash):
                            raise ValueError("Reserved escape sequence used")
                        if backslash:
                            backslash = False
                for prefix in ["\\u", "\\U"]:
                    if prefix in v:
                        hexbytes = v.split(prefix)
                        v = _load_unicode_escapes(hexbytes[0], hexbytes[1:],
                                                  prefix)
                v = _unescape(v)
            if len(v) > 1 and v[1] == quotechar and (len(v) < 3 or
                                                     v[1] == v[2]):
                v = v[2:-2]
            return (v[1:-1], "str")
        elif v[0] == '[':
            return (self.load_array(v), "array")
        elif v[0] == '{':
            inline_object = self.get_empty_inline_table()
            self.load_inline_object(v, inline_object)
            return (inline_object, "inline_object")
        elif TIME_RE.match(v):
            h, m, s, _, ms = TIME_RE.match(v).groups()
            time = datetime.time(int(h), int(m), int(s), int(ms) if ms else 0)
            return (time, "time")
        else:
            parsed_date = _load_date(v)
            if parsed_date is not None:
                return (parsed_date, "date")
            if not strictly_valid:
                raise ValueError("Weirdness with leading zeroes or "
                                 "underscores in your number.")
            itype = "int"
            neg = False
            if v[0] == '-':
                neg = True
                v = v[1:]
            elif v[0] == '+':
                v = v[1:]
            v = v.replace('_', '')
            lowerv = v.lower()
            if '.' in v or ('x' not in v and ('e' in v or 'E' in v)):
                if '.' in v and v.split('.', 1)[1] == '':
                    raise ValueError("This float is missing digits after "
                                     "the point")
                if v[0] not in '0123456789':
                    raise ValueError("This float doesn't have a leading "
                                     "digit")
                v = float(v)
                itype = "float"
            elif len(lowerv) == 3 and (lowerv == 'inf' or lowerv == 'nan'):
                v = float(v)
                itype = "float"
            if itype == "int":
                v = int(v, 0)
            if neg:
                return (0 - v, itype)
            return (v, itype)

    def bounded_string(self, s):
        if len(s) == 0:
            return True
        if s[-1] != s[0]:
            return False
        i = -2
        backslash = False
        while len(s) + i > 0:
            if s[i] == "\\":
                backslash = not backslash
                i -= 1
            else:
                break
        return not backslash

    def _load_array_isstrarray(self, a):
        a = a[1:-1].strip()
        if a != '' and (a[0] == '"' or a[0] == "'"):
            return True
        return False

    def load_array(self, a):
        atype = None
        retval = []
        a = a.strip()
        if '[' not in a[1:-1] or "" != a[1:-1].split('[')[0].strip():
            strarray = self._load_array_isstrarray(a)
            if not a[1:-1].strip().startswith('{'):
                a = a[1:-1].split(',')
            else:
                # a is an inline object, we must find the matching parenthesis
                # to define groups
                new_a = []
                start_group_index = 1
                end_group_index = 2
                open_bracket_count = 1 if a[start_group_index] == '{' else 0
                in_str = False
                while end_group_index < len(a[1:]):
                    if a[end_group_index] == '"' or a[end_group_index] == "'":
                        if in_str:
                            backslash_index = end_group_index - 1
                            while (backslash_index > -1 and
                                   a[backslash_index] == '\\'):
                                in_str = not in_str
                                backslash_index -= 1
                        in_str = not in_str
                    if not in_str and a[end_group_index] == '{':
                        open_bracket_count += 1
                    if in_str or a[end_group_index] != '}':
                        end_group_index += 1
                        continue
                    elif a[end_group_index] == '}' and open_bracket_count > 1:
                        open_bracket_count -= 1
                        end_group_index += 1
                        continue

                    # Increase end_group_index by 1 to get the closing bracket
                    end_group_index += 1

                    new_a.append(a[start_group_index:end_group_index])

                    # The next start index is at least after the closing
                    # bracket, a closing bracket can be followed by a comma
                    # since we are in an array.
                    start_group_index = end_group_index + 1
                    while (start_group_index < len(a[1:]) and
                           a[start_group_index] != '{'):
                        start_group_index += 1
                    end_group_index = start_group_index + 1
                a = new_a
            b = 0
            if strarray:
                while b < len(a) - 1:
                    ab = a[b].strip()
                    while (not self.bounded_string(ab) or
                           (len(ab) > 2 and
                            ab[0] == ab[1] == ab[2] and
                            ab[-2] != ab[0] and
                            ab[-3] != ab[0])):
                        a[b] = a[b] + ',' + a[b + 1]
                        ab = a[b].strip()
                        if b < len(a) - 2:
                            a = a[:b + 1] + a[b + 2:]
                        else:
                            a = a[:b + 1]
                    b += 1
        else:
            al = list(a[1:-1])
            a = []
            openarr = 0
            j = 0
            for i in _range(len(al)):
                if al[i] == '[':
                    openarr += 1
                elif al[i] == ']':
                    openarr -= 1
                elif al[i] == ',' and not openarr:
                    a.append(''.join(al[j:i]))
                    j = i + 1
            a.append(''.join(al[j:]))
        for i in _range(len(a)):
            a[i] = a[i].strip()
            if a[i] != '':
                nval, ntype = self.load_value(a[i])
                if atype:
                    if ntype != atype:
                        raise ValueError("Not a homogeneous array")
                else:
                    atype = ntype
                retval.append(nval)
        return retval

    def preserve_comment(self, line_no, key, comment, beginline):
        pass

    def embed_comments(self, idx, currentlevel):
        pass


class TomlPreserveCommentDecoder(TomlDecoder):

    def __init__(self, _dict=dict):
        self.saved_comments = {}
        super(TomlPreserveCommentDecoder, self).__init__(_dict)

    def preserve_comment(self, line_no, key, comment, beginline):
        self.saved_comments[line_no] = (key, comment, beginline)

    def embed_comments(self, idx, currentlevel):
        if idx not in self.saved_comments:
            return

        key, comment, beginline = self.saved_comments[idx]
        currentlevel[key] = CommentValue(currentlevel[key], comment, beginline,
                                         self._dict)