-
Notifications
You must be signed in to change notification settings - Fork 3
/
csv.h
1270 lines (1086 loc) · 55.9 KB
/
csv.h
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
// Copyright: (2012-2015) Ben Strasser <code@ben-strasser.net>
// License: BSD-3
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
#ifndef CSV_H
#define CSV_H
#include <vector>
#include <string>
#include <cstring>
#include <algorithm>
#include <utility>
#include <cstdio>
#include <exception>
#ifndef CSV_IO_NO_THREAD
#include <mutex>
#include <thread>
#include <condition_variable>
#endif
#include <memory>
#include <cassert>
#include <cerrno>
#include <istream>
namespace io{
////////////////////////////////////////////////////////////////////////////
// LineReader //
////////////////////////////////////////////////////////////////////////////
namespace error{
struct base : std::exception{
virtual void format_error_message()const = 0;
const char*what()const noexcept override{
format_error_message();
return error_message_buffer;
}
mutable char error_message_buffer[512];
};
const int max_file_name_length = 255;
struct with_file_name{
with_file_name(){
std::memset(file_name, 0, sizeof(file_name));
}
void set_file_name(const char*file_name){
if(file_name != nullptr){
strncpy(this->file_name, file_name, sizeof(this->file_name));
this->file_name[sizeof(this->file_name)-1] = '\0';
}else{
this->file_name[0] = '\0';
}
}
char file_name[max_file_name_length+1];
};
struct with_file_line{
with_file_line(){
file_line = -1;
}
void set_file_line(int file_line){
this->file_line = file_line;
}
int file_line;
};
struct with_errno{
with_errno(){
errno_value = 0;
}
void set_errno(int errno_value){
this->errno_value = errno_value;
}
int errno_value;
};
struct can_not_open_file :
base,
with_file_name,
with_errno{
void format_error_message()const override{
if(errno_value != 0)
std::snprintf(error_message_buffer, sizeof(error_message_buffer),
"Can not open file \"%s\" because \"%s\"."
, file_name, std::strerror(errno_value));
else
std::snprintf(error_message_buffer, sizeof(error_message_buffer),
"Can not open file \"%s\"."
, file_name);
}
};
struct line_length_limit_exceeded :
base,
with_file_name,
with_file_line{
void format_error_message()const override{
std::snprintf(error_message_buffer, sizeof(error_message_buffer),
"Line number %d in file \"%s\" exceeds the maximum length of 2^24-1."
, file_line, file_name);
}
};
}
class ByteSourceBase{
public:
virtual int read(char*buffer, int size)=0;
virtual ~ByteSourceBase(){}
};
namespace detail{
class OwningStdIOByteSourceBase : public ByteSourceBase{
public:
explicit OwningStdIOByteSourceBase(FILE*file):file(file){
// Tell the std library that we want to do the buffering ourself.
std::setvbuf(file, 0, _IONBF, 0);
}
int read(char*buffer, int size){
return std::fread(buffer, 1, size, file);
}
~OwningStdIOByteSourceBase(){
std::fclose(file);
}
private:
FILE*file;
};
class NonOwningIStreamByteSource : public ByteSourceBase{
public:
explicit NonOwningIStreamByteSource(std::istream&in):in(in){}
int read(char*buffer, int size){
in.read(buffer, size);
return in.gcount();
}
~NonOwningIStreamByteSource(){}
private:
std::istream∈
};
class NonOwningStringByteSource : public ByteSourceBase{
public:
NonOwningStringByteSource(const char*str, long long size):str(str), remaining_byte_count(size){}
int read(char*buffer, int desired_byte_count){
int to_copy_byte_count = desired_byte_count;
if(remaining_byte_count < to_copy_byte_count)
to_copy_byte_count = remaining_byte_count;
std::memcpy(buffer, str, to_copy_byte_count);
remaining_byte_count -= to_copy_byte_count;
str += to_copy_byte_count;
return to_copy_byte_count;
}
~NonOwningStringByteSource(){}
private:
const char*str;
long long remaining_byte_count;
};
#ifndef CSV_IO_NO_THREAD
class AsynchronousReader{
public:
void init(std::unique_ptr<ByteSourceBase>arg_byte_source){
std::unique_lock<std::mutex>guard(lock);
byte_source = std::move(arg_byte_source);
desired_byte_count = -1;
termination_requested = false;
worker = std::thread(
[&]{
std::unique_lock<std::mutex>guard(lock);
try{
for(;;){
read_requested_condition.wait(
guard,
[&]{
return desired_byte_count != -1 || termination_requested;
}
);
if(termination_requested)
return;
read_byte_count = byte_source->read(buffer, desired_byte_count);
desired_byte_count = -1;
if(read_byte_count == 0)
break;
read_finished_condition.notify_one();
}
}catch(...){
read_error = std::current_exception();
}
read_finished_condition.notify_one();
}
);
}
bool is_valid()const{
return byte_source != nullptr;
}
void start_read(char*arg_buffer, int arg_desired_byte_count){
std::unique_lock<std::mutex>guard(lock);
buffer = arg_buffer;
desired_byte_count = arg_desired_byte_count;
read_byte_count = -1;
read_requested_condition.notify_one();
}
int finish_read(){
std::unique_lock<std::mutex>guard(lock);
read_finished_condition.wait(
guard,
[&]{
return read_byte_count != -1 || read_error;
}
);
if(read_error)
std::rethrow_exception(read_error);
else
return read_byte_count;
}
~AsynchronousReader(){
if(byte_source != nullptr){
{
std::unique_lock<std::mutex>guard(lock);
termination_requested = true;
}
read_requested_condition.notify_one();
worker.join();
}
}
private:
std::unique_ptr<ByteSourceBase>byte_source;
std::thread worker;
bool termination_requested;
std::exception_ptr read_error;
char*buffer;
int desired_byte_count;
int read_byte_count;
std::mutex lock;
std::condition_variable read_finished_condition;
std::condition_variable read_requested_condition;
};
#endif
class SynchronousReader{
public:
void init(std::unique_ptr<ByteSourceBase>arg_byte_source){
byte_source = std::move(arg_byte_source);
}
bool is_valid()const{
return byte_source != nullptr;
}
void start_read(char*arg_buffer, int arg_desired_byte_count){
buffer = arg_buffer;
desired_byte_count = arg_desired_byte_count;
}
int finish_read(){
return byte_source->read(buffer, desired_byte_count);
}
private:
std::unique_ptr<ByteSourceBase>byte_source;
char*buffer;
int desired_byte_count;
};
}
class LineReader{
private:
static const int block_len = 1<<20;
std::unique_ptr<char[]>buffer; // must be constructed before (and thus destructed after) the reader!
#ifdef CSV_IO_NO_THREAD
detail::SynchronousReader reader;
#else
detail::AsynchronousReader reader;
#endif
int data_begin;
int data_end;
char file_name[error::max_file_name_length+1];
unsigned file_line;
static std::unique_ptr<ByteSourceBase> open_file(const char*file_name){
// We open the file in binary mode as it makes no difference under *nix
// and under Windows we handle \r\n newlines ourself.
FILE*file = std::fopen(file_name, "rb");
if(file == 0){
int x = errno; // store errno as soon as possible, doing it after constructor call can fail.
error::can_not_open_file err;
err.set_errno(x);
err.set_file_name(file_name);
throw err;
}
return std::unique_ptr<ByteSourceBase>(new detail::OwningStdIOByteSourceBase(file));
}
void init(std::unique_ptr<ByteSourceBase>byte_source){
file_line = 0;
buffer = std::unique_ptr<char[]>(new char[3*block_len]);
data_begin = 0;
data_end = byte_source->read(buffer.get(), 2*block_len);
// Ignore UTF-8 BOM
if(data_end >= 3 && buffer[0] == '\xEF' && buffer[1] == '\xBB' && buffer[2] == '\xBF')
data_begin = 3;
if(data_end == 2*block_len){
reader.init(std::move(byte_source));
reader.start_read(buffer.get() + 2*block_len, block_len);
}
}
public:
LineReader() = delete;
LineReader(const LineReader&) = delete;
LineReader&operator=(const LineReader&) = delete;
explicit LineReader(const char*file_name){
set_file_name(file_name);
init(open_file(file_name));
}
explicit LineReader(const std::string&file_name){
set_file_name(file_name.c_str());
init(open_file(file_name.c_str()));
}
LineReader(const char*file_name, std::unique_ptr<ByteSourceBase>byte_source){
set_file_name(file_name);
init(std::move(byte_source));
}
LineReader(const std::string&file_name, std::unique_ptr<ByteSourceBase>byte_source){
set_file_name(file_name.c_str());
init(std::move(byte_source));
}
LineReader(const char*file_name, const char*data_begin, const char*data_end){
set_file_name(file_name);
init(std::unique_ptr<ByteSourceBase>(new detail::NonOwningStringByteSource(data_begin, data_end-data_begin)));
}
LineReader(const std::string&file_name, const char*data_begin, const char*data_end){
set_file_name(file_name.c_str());
init(std::unique_ptr<ByteSourceBase>(new detail::NonOwningStringByteSource(data_begin, data_end-data_begin)));
}
LineReader(const char*file_name, FILE*file){
set_file_name(file_name);
init(std::unique_ptr<ByteSourceBase>(new detail::OwningStdIOByteSourceBase(file)));
}
LineReader(const std::string&file_name, FILE*file){
set_file_name(file_name.c_str());
init(std::unique_ptr<ByteSourceBase>(new detail::OwningStdIOByteSourceBase(file)));
}
LineReader(const char*file_name, std::istream&in){
set_file_name(file_name);
init(std::unique_ptr<ByteSourceBase>(new detail::NonOwningIStreamByteSource(in)));
}
LineReader(const std::string&file_name, std::istream&in){
set_file_name(file_name.c_str());
init(std::unique_ptr<ByteSourceBase>(new detail::NonOwningIStreamByteSource(in)));
}
void set_file_name(const std::string&file_name){
set_file_name(file_name.c_str());
}
void set_file_name(const char*file_name){
if(file_name != nullptr){
strncpy(this->file_name, file_name, sizeof(this->file_name));
this->file_name[sizeof(this->file_name)-1] = '\0';
}else{
this->file_name[0] = '\0';
}
}
const char*get_truncated_file_name()const{
return file_name;
}
void set_file_line(unsigned file_line){
this->file_line = file_line;
}
unsigned get_file_line()const{
return file_line;
}
char*next_line(){
if(data_begin == data_end)
return nullptr;
++file_line;
assert(data_begin < data_end);
assert(data_end <= block_len*2);
if(data_begin >= block_len){
std::memcpy(buffer.get(), buffer.get()+block_len, block_len);
data_begin -= block_len;
data_end -= block_len;
if(reader.is_valid())
{
data_end += reader.finish_read();
std::memcpy(buffer.get()+block_len, buffer.get()+2*block_len, block_len);
reader.start_read(buffer.get() + 2*block_len, block_len);
}
}
int line_end = data_begin;
while(buffer[line_end] != '\n' && line_end != data_end){
++line_end;
}
if(line_end - data_begin + 1 > block_len){
error::line_length_limit_exceeded err;
err.set_file_name(file_name);
err.set_file_line(file_line);
throw err;
}
if(buffer[line_end] == '\n' && line_end != data_end){
buffer[line_end] = '\0';
}else{
// some files are missing the newline at the end of the
// last line
++data_end;
buffer[line_end] = '\0';
}
// handle windows \r\n-line breaks
if(line_end != data_begin && buffer[line_end-1] == '\r')
buffer[line_end-1] = '\0';
char*ret = buffer.get() + data_begin;
data_begin = line_end+1;
return ret;
}
};
////////////////////////////////////////////////////////////////////////////
// CSV //
////////////////////////////////////////////////////////////////////////////
namespace error{
const int max_column_name_length = 63;
struct with_column_name{
with_column_name(){
std::memset(column_name, 0, max_column_name_length+1);
}
void set_column_name(const char*column_name){
if(column_name != nullptr){
std::strncpy(this->column_name, column_name, max_column_name_length);
this->column_name[max_column_name_length] = '\0';
}else{
this->column_name[0] = '\0';
}
}
char column_name[max_column_name_length+1];
};
const int max_column_content_length = 63;
struct with_column_content{
with_column_content(){
std::memset(column_content, 0, max_column_content_length+1);
}
void set_column_content(const char*column_content){
if(column_content != nullptr){
std::strncpy(this->column_content, column_content, max_column_content_length);
this->column_content[max_column_content_length] = '\0';
}else{
this->column_content[0] = '\0';
}
}
char column_content[max_column_content_length+1];
};
struct extra_column_in_header :
base,
with_file_name,
with_column_name{
void format_error_message()const override{
std::snprintf(error_message_buffer, sizeof(error_message_buffer),
R"(Extra column "%s" in header of file "%s".)"
, column_name, file_name);
}
};
struct missing_column_in_header :
base,
with_file_name,
with_column_name{
void format_error_message()const override{
std::snprintf(error_message_buffer, sizeof(error_message_buffer),
R"(Missing column "%s" in header of file "%s".)"
, column_name, file_name);
}
};
struct duplicated_column_in_header :
base,
with_file_name,
with_column_name{
void format_error_message()const override{
std::snprintf(error_message_buffer, sizeof(error_message_buffer),
R"(Duplicated column "%s" in header of file "%s".)"
, column_name, file_name);
}
};
struct header_missing :
base,
with_file_name{
void format_error_message()const override{
std::snprintf(error_message_buffer, sizeof(error_message_buffer),
"Header missing in file \"%s\"."
, file_name);
}
};
struct too_few_columns :
base,
with_file_name,
with_file_line{
void format_error_message()const override{
std::snprintf(error_message_buffer, sizeof(error_message_buffer),
"Too few columns in line %d in file \"%s\"."
, file_line, file_name);
}
};
struct too_many_columns :
base,
with_file_name,
with_file_line{
void format_error_message()const override{
std::snprintf(error_message_buffer, sizeof(error_message_buffer),
"Too many columns in line %d in file \"%s\"."
, file_line, file_name);
}
};
struct escaped_string_not_closed :
base,
with_file_name,
with_file_line{
void format_error_message()const override{
std::snprintf(error_message_buffer, sizeof(error_message_buffer),
"Escaped string was not closed in line %d in file \"%s\"."
, file_line, file_name);
}
};
struct integer_must_be_positive :
base,
with_file_name,
with_file_line,
with_column_name,
with_column_content{
void format_error_message()const override{
std::snprintf(error_message_buffer, sizeof(error_message_buffer),
R"(The integer "%s" must be positive or 0 in column "%s" in file "%s" in line "%d".)"
, column_content, column_name, file_name, file_line);
}
};
struct no_digit :
base,
with_file_name,
with_file_line,
with_column_name,
with_column_content{
void format_error_message()const override{
std::snprintf(error_message_buffer, sizeof(error_message_buffer),
R"(The integer "%s" contains an invalid digit in column "%s" in file "%s" in line "%d".)"
, column_content, column_name, file_name, file_line);
}
};
struct integer_overflow :
base,
with_file_name,
with_file_line,
with_column_name,
with_column_content{
void format_error_message()const override{
std::snprintf(error_message_buffer, sizeof(error_message_buffer),
R"(The integer "%s" overflows in column "%s" in file "%s" in line "%d".)"
, column_content, column_name, file_name, file_line);
}
};
struct integer_underflow :
base,
with_file_name,
with_file_line,
with_column_name,
with_column_content{
void format_error_message()const override{
std::snprintf(error_message_buffer, sizeof(error_message_buffer),
R"(The integer "%s" underflows in column "%s" in file "%s" in line "%d".)"
, column_content, column_name, file_name, file_line);
}
};
struct invalid_single_character :
base,
with_file_name,
with_file_line,
with_column_name,
with_column_content{
void format_error_message()const override{
std::snprintf(error_message_buffer, sizeof(error_message_buffer),
R"(The content "%s" of column "%s" in file "%s" in line "%d" is not a single character.)"
, column_content, column_name, file_name, file_line);
}
};
}
using ignore_column = unsigned int;
static const ignore_column ignore_no_column = 0;
static const ignore_column ignore_extra_column = 1;
static const ignore_column ignore_missing_column = 2;
template<char ... trim_char_list>
struct trim_chars{
private:
constexpr static bool is_trim_char(char){
return false;
}
template<class ...OtherTrimChars>
constexpr static bool is_trim_char(char c, char trim_char, OtherTrimChars...other_trim_chars){
return c == trim_char || is_trim_char(c, other_trim_chars...);
}
public:
static void trim(char*&str_begin, char*&str_end){
while(str_begin != str_end && is_trim_char(*str_begin, trim_char_list...))
++str_begin;
while(str_begin != str_end && is_trim_char(*(str_end-1), trim_char_list...))
--str_end;
*str_end = '\0';
}
};
struct no_comment{
static bool is_comment(const char*){
return false;
}
};
template<char ... comment_start_char_list>
struct single_line_comment{
private:
constexpr static bool is_comment_start_char(char){
return false;
}
template<class ...OtherCommentStartChars>
constexpr static bool is_comment_start_char(char c, char comment_start_char, OtherCommentStartChars...other_comment_start_chars){
return c == comment_start_char || is_comment_start_char(c, other_comment_start_chars...);
}
public:
static bool is_comment(const char*line){
return is_comment_start_char(*line, comment_start_char_list...);
}
};
struct empty_line_comment{
static bool is_comment(const char*line){
if(*line == '\0')
return true;
while(*line == ' ' || *line == '\t'){
++line;
if(*line == 0)
return true;
}
return false;
}
};
template<char ... comment_start_char_list>
struct single_and_empty_line_comment{
static bool is_comment(const char*line){
return single_line_comment<comment_start_char_list...>::is_comment(line) || empty_line_comment::is_comment(line);
}
};
template<char sep>
struct no_quote_escape{
static const char*find_next_column_end(const char*col_begin){
while(*col_begin != sep && *col_begin != '\0')
++col_begin;
return col_begin;
}
static void unescape(char*&, char*&){
}
};
template<char sep, char quote>
struct double_quote_escape{
static const char*find_next_column_end(const char*col_begin){
while(*col_begin != sep && *col_begin != '\0')
if(*col_begin != quote)
++col_begin;
else{
do{
++col_begin;
while(*col_begin != quote){
if(*col_begin == '\0')
throw error::escaped_string_not_closed();
++col_begin;
}
++col_begin;
}while(*col_begin == quote);
}
return col_begin;
}
static void unescape(char*&col_begin, char*&col_end){
if(col_end - col_begin >= 2){
if(*col_begin == quote && *(col_end-1) == quote){
++col_begin;
--col_end;
char*out = col_begin;
for(char*in = col_begin; in!=col_end; ++in){
if(*in == quote && (in+1) != col_end && *(in+1) == quote){
++in;
}
*out = *in;
++out;
}
col_end = out;
*col_end = '\0';
}
}
}
};
struct throw_on_overflow{
template<class T>
static void on_overflow(T&){
throw error::integer_overflow();
}
template<class T>
static void on_underflow(T&){
throw error::integer_underflow();
}
};
struct ignore_overflow{
template<class T>
static void on_overflow(T&){}
template<class T>
static void on_underflow(T&){}
};
struct set_to_max_on_overflow{
template<class T>
static void on_overflow(T&x){
// using (std::numeric_limits<T>::max) instead of std::numeric_limits<T>::max
// to make code including windows.h with its max macro happy
x = (std::numeric_limits<T>::max)();
}
template<class T>
static void on_underflow(T&x){
x = (std::numeric_limits<T>::min)();
}
};
namespace detail{
template<class quote_policy>
void chop_next_column(
char*&line, char*&col_begin, char*&col_end
){
assert(line != nullptr);
col_begin = line;
// the col_begin + (... - col_begin) removes the constness
col_end = col_begin + (quote_policy::find_next_column_end(col_begin) - col_begin);
if(*col_end == '\0'){
line = nullptr;
}else{
*col_end = '\0';
line = col_end + 1;
}
}
template<class trim_policy, class quote_policy>
void parse_line(
char*line,
char**sorted_col,
const std::vector<int>&col_order
){
for (int i : col_order) {
if(line == nullptr)
throw ::io::error::too_few_columns();
char*col_begin, *col_end;
chop_next_column<quote_policy>(line, col_begin, col_end);
if (i != -1) {
trim_policy::trim(col_begin, col_end);
quote_policy::unescape(col_begin, col_end);
sorted_col[i] = col_begin;
}
}
if(line != nullptr)
throw ::io::error::too_many_columns();
}
template<unsigned column_count, class trim_policy, class quote_policy>
void parse_header_line(
char*line,
std::vector<int>&col_order,
const std::string*col_name,
ignore_column ignore_policy
){
col_order.clear();
bool found[column_count];
std::fill(found, found + column_count, false);
while(line){
char*col_begin,*col_end;
chop_next_column<quote_policy>(line, col_begin, col_end);
trim_policy::trim(col_begin, col_end);
quote_policy::unescape(col_begin, col_end);
for(unsigned i=0; i<column_count; ++i)
if(col_begin == col_name[i]){
if(found[i]){
error::duplicated_column_in_header err;
err.set_column_name(col_begin);
throw err;
}
found[i] = true;
col_order.push_back(i);
col_begin = 0;
break;
}
if(col_begin){
if(ignore_policy & ::io::ignore_extra_column)
col_order.push_back(-1);
else{
error::extra_column_in_header err;
err.set_column_name(col_begin);
throw err;
}
}
}
if(!(ignore_policy & ::io::ignore_missing_column)){
for(unsigned i=0; i<column_count; ++i){
if(!found[i]){
error::missing_column_in_header err;
err.set_column_name(col_name[i].c_str());
throw err;
}
}
}
}
template<class overflow_policy>
void parse(char*col, char &x){
if(!*col)
throw error::invalid_single_character();
x = *col;
++col;
if(*col)
throw error::invalid_single_character();
}
template<class overflow_policy>
void parse(char*col, std::string&x){
x = col;
}
template<class overflow_policy>
void parse(char*col, const char*&x){
x = col;
}
template<class overflow_policy>
void parse(char*col, char*&x){
x = col;
}
template<class overflow_policy, class T>
void parse_unsigned_integer(const char*col, T&x){
x = 0;
while(*col != '\0'){
if('0' <= *col && *col <= '9'){
T y = *col - '0';
if(x > ((std::numeric_limits<T>::max)()-y)/10){
overflow_policy::on_overflow(x);
return;
}
x = 10*x+y;
}else
throw error::no_digit();
++col;
}
}
template<class overflow_policy>void parse(char*col, unsigned char &x)
{parse_unsigned_integer<overflow_policy>(col, x);}
template<class overflow_policy>void parse(char*col, unsigned short &x)
{parse_unsigned_integer<overflow_policy>(col, x);}
template<class overflow_policy>void parse(char*col, unsigned int &x)
{parse_unsigned_integer<overflow_policy>(col, x);}
template<class overflow_policy>void parse(char*col, unsigned long &x)
{parse_unsigned_integer<overflow_policy>(col, x);}
template<class overflow_policy>void parse(char*col, unsigned long long &x)
{parse_unsigned_integer<overflow_policy>(col, x);}
template<class overflow_policy, class T>
void parse_signed_integer(const char*col, T&x){
if(*col == '-'){
++col;
x = 0;
while(*col != '\0'){
if('0' <= *col && *col <= '9'){
T y = *col - '0';
if(x < ((std::numeric_limits<T>::min)()+y)/10){