forked from srvbots/cppformat
-
Notifications
You must be signed in to change notification settings - Fork 0
/
format.cc
1192 lines (1080 loc) · 34.4 KB
/
format.cc
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
/*
Formatting library for C++
Copyright (c) 2012 - 2014, Victor Zverovich
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.
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 OWNER 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.
*/
// Disable useless MSVC warnings.
#undef _CRT_SECURE_NO_WARNINGS
#define _CRT_SECURE_NO_WARNINGS
#undef _SCL_SECURE_NO_WARNINGS
#define _SCL_SECURE_NO_WARNINGS
#include "format.h"
#include <string.h>
#include <cctype>
#include <cerrno>
#include <climits>
#include <cmath>
#include <cstdarg>
#ifdef _WIN32
# define WIN32_LEAN_AND_MEAN
# ifdef __MINGW32__
# include <cstring>
# endif
# include <windows.h>
# undef ERROR
#endif
using fmt::LongLong;
using fmt::ULongLong;
using fmt::internal::Arg;
#if _MSC_VER
# pragma warning(push)
# pragma warning(disable: 4127) // conditional expression is constant
#endif
namespace {
#ifndef _MSC_VER
inline int SignBit(double value) {
// When compiled in C++11 mode signbit is no longer a macro but a function
// defined in namespace std and the macro is undefined.
#ifdef signbit
return signbit(value);
#else
return std::signbit(value);
#endif
}
inline int IsInf(double x) {
#ifdef isinf
return isinf(x);
#else
return std::isinf(x);
#endif
}
#define FMT_SNPRINTF snprintf
#else // _MSC_VER
inline int SignBit(double value) {
if (value < 0) return 1;
if (value == value) return 0;
int dec = 0, sign = 0;
char buffer[2]; // The buffer size must be >= 2 or _ecvt_s will fail.
_ecvt_s(buffer, sizeof(buffer), value, 0, &dec, &sign);
return sign;
}
inline int IsInf(double x) { return !_finite(x); }
inline int FMT_SNPRINTF(char *buffer, size_t size, const char *format, ...) {
va_list args;
va_start(args, format);
int result = vsnprintf_s(buffer, size, _TRUNCATE, format, args);
va_end(args);
return result;
}
#endif // _MSC_VER
const char RESET_COLOR[] = "\x1b[0m";
typedef void (*FormatFunc)(fmt::Writer &, int , fmt::StringRef);
void ReportError(FormatFunc func,
int error_code, fmt::StringRef message) FMT_NOEXCEPT(true) {
try {
fmt::Writer full_message;
func(full_message, error_code, message); // TODO: make sure this doesn't throw
std::fwrite(full_message.c_str(), full_message.size(), 1, stderr);
std::fputc('\n', stderr);
} catch (...) {}
}
const Arg DUMMY_ARG = {Arg::INT, 0};
fmt::ULongLong GetIntValue(const Arg &arg) {
switch (arg.type) {
case Arg::INT:
return arg.int_value;
case Arg::UINT:
return arg.uint_value;
case Arg::LONG_LONG:
return arg.long_long_value;
case Arg::ULONG_LONG:
return arg.ulong_long_value;
default:
return -1;
}
}
// Parses an unsigned integer advancing s to the end of the parsed input.
// This function assumes that the first character of s is a digit.
template <typename Char>
int ParseNonnegativeInt(const Char *&s, const char *&error) FMT_NOEXCEPT(true) {
assert('0' <= *s && *s <= '9');
unsigned value = 0;
do {
unsigned new_value = value * 10 + (*s++ - '0');
// Check if value wrapped around.
value = new_value >= value ? new_value : UINT_MAX;
} while ('0' <= *s && *s <= '9');
if (value > INT_MAX) {
if (!error)
error = "number is too big in format";
return 0;
}
return value;
}
template <typename Char>
const Char *find_closing_brace(const Char *s, int num_open_braces = 1) {
for (int n = num_open_braces; *s; ++s) {
if (*s == '{') {
++n;
} else if (*s == '}') {
if (--n == 0)
return s;
}
}
throw fmt::FormatError("unmatched '{' in format");
}
// Checks if an argument is a valid printf width specifier and sets
// left alignment if it is negative.
struct WidthHandler : public fmt::internal::ArgVisitor<WidthHandler, unsigned> {
private:
fmt::FormatSpec &spec_;
public:
explicit WidthHandler(fmt::FormatSpec &spec) : spec_(spec) {}
unsigned visit_unhandled_arg() {
throw fmt::FormatError("width is not integer");
}
template <typename T>
unsigned visit_any_int(T value) {
typedef typename fmt::internal::IntTraits<T>::MainType UnsignedType;
UnsignedType width = value;
if (fmt::internal::is_negative(value)) {
spec_.align_ = fmt::ALIGN_LEFT;
width = 0 - width;
}
if (width > INT_MAX)
throw fmt::FormatError("number is too big in format");
return static_cast<unsigned>(width);
}
};
// This function template is used to prevent compile errors when handling
// incompatible string arguments, e.g. handling a wide string in a narrow
// string formatter.
template <typename Char>
Arg::StringValue<Char> ignore_incompatible_str(Arg::StringValue<wchar_t>);
template <>
inline Arg::StringValue<char> ignore_incompatible_str(
Arg::StringValue<wchar_t>) { return Arg::StringValue<char>(); }
template <>
inline Arg::StringValue<wchar_t> ignore_incompatible_str(
Arg::StringValue<wchar_t> s) { return s; }
} // namespace
int fmt::internal::SignBitNoInline(double value) { return SignBit(value); }
void fmt::SystemError::init(
int error_code, StringRef format_str, const ArgList &args) {
error_code_ = error_code;
Writer w;
internal::FormatSystemErrorMessage(w, error_code, format(format_str, args));
std::runtime_error &base = *this;
base = std::runtime_error(w.str());
}
template <typename T>
int fmt::internal::CharTraits<char>::FormatFloat(
char *buffer, std::size_t size, const char *format,
unsigned width, int precision, T value) {
if (width == 0) {
return precision < 0 ?
FMT_SNPRINTF(buffer, size, format, value) :
FMT_SNPRINTF(buffer, size, format, precision, value);
}
return precision < 0 ?
FMT_SNPRINTF(buffer, size, format, width, value) :
FMT_SNPRINTF(buffer, size, format, width, precision, value);
}
template <typename T>
int fmt::internal::CharTraits<wchar_t>::FormatFloat(
wchar_t *buffer, std::size_t size, const wchar_t *format,
unsigned width, int precision, T value) {
if (width == 0) {
return precision < 0 ?
swprintf(buffer, size, format, value) :
swprintf(buffer, size, format, precision, value);
}
return precision < 0 ?
swprintf(buffer, size, format, width, value) :
swprintf(buffer, size, format, width, precision, value);
}
const char fmt::internal::DIGITS[] =
"0001020304050607080910111213141516171819"
"2021222324252627282930313233343536373839"
"4041424344454647484950515253545556575859"
"6061626364656667686970717273747576777879"
"8081828384858687888990919293949596979899";
#define FMT_POWERS_OF_10(factor) \
factor * 10, \
factor * 100, \
factor * 1000, \
factor * 10000, \
factor * 100000, \
factor * 1000000, \
factor * 10000000, \
factor * 100000000, \
factor * 1000000000
const uint32_t fmt::internal::POWERS_OF_10_32[] = {0, FMT_POWERS_OF_10(1)};
const uint64_t fmt::internal::POWERS_OF_10_64[] = {
0,
FMT_POWERS_OF_10(1),
FMT_POWERS_OF_10(ULongLong(1000000000)),
// Multiply several constants instead of using a single long long constants
// to avoid warnings about C++98 not supporting long long.
ULongLong(1000000000) * ULongLong(1000000000) * 10
};
void fmt::internal::ReportUnknownType(char code, const char *type) {
if (std::isprint(static_cast<unsigned char>(code))) {
throw fmt::FormatError(
fmt::format("unknown format code '{}' for {}", code, type));
}
throw fmt::FormatError(
fmt::format("unknown format code '\\x{:02x}' for {}",
static_cast<unsigned>(code), type));
}
#ifdef _WIN32
fmt::internal::UTF8ToUTF16::UTF8ToUTF16(fmt::StringRef s) {
int length = MultiByteToWideChar(
CP_UTF8, MB_ERR_INVALID_CHARS, s.c_str(), -1, 0, 0);
static const char ERROR[] = "cannot convert string from UTF-8 to UTF-16";
if (length == 0)
throw WindowsError(GetLastError(), ERROR);
buffer_.resize(length);
length = MultiByteToWideChar(
CP_UTF8, MB_ERR_INVALID_CHARS, s.c_str(), -1, &buffer_[0], length);
if (length == 0)
throw WindowsError(GetLastError(), ERROR);
}
fmt::internal::UTF16ToUTF8::UTF16ToUTF8(fmt::WStringRef s) {
if (int error_code = Convert(s)) {
throw WindowsError(error_code,
"cannot convert string from UTF-16 to UTF-8");
}
}
int fmt::internal::UTF16ToUTF8::Convert(fmt::WStringRef s) {
int length = WideCharToMultiByte(CP_UTF8, 0, s.c_str(), -1, 0, 0, 0, 0);
if (length == 0)
return GetLastError();
buffer_.resize(length);
length = WideCharToMultiByte(
CP_UTF8, 0, s.c_str(), -1, &buffer_[0], length, 0, 0);
if (length == 0)
return GetLastError();
return 0;
}
void fmt::WindowsError::init(
int error_code, StringRef format_str, const ArgList &args) {
error_code_ = error_code;
Writer w;
internal::FormatWinErrorMessage(w, error_code, format(format_str, args));
std::runtime_error &base = *this;
base = std::runtime_error(w.str());
}
#endif
int fmt::internal::StrError(
int error_code, char *&buffer, std::size_t buffer_size) FMT_NOEXCEPT(true) {
assert(buffer != 0 && buffer_size != 0);
int result = 0;
#ifdef _GNU_SOURCE
char *message = strerror_r(error_code, buffer, buffer_size);
// If the buffer is full then the message is probably truncated.
if (message == buffer && strlen(buffer) == buffer_size - 1)
result = ERANGE;
buffer = message;
#elif __MINGW32__
errno = 0;
(void)buffer_size;
buffer = strerror(error_code);
result = errno;
#elif _WIN32
result = strerror_s(buffer, buffer_size, error_code);
// If the buffer is full then the message is probably truncated.
if (result == 0 && std::strlen(buffer) == buffer_size - 1)
result = ERANGE;
#else
result = strerror_r(error_code, buffer, buffer_size);
if (result == -1)
result = errno; // glibc versions before 2.13 return result in errno.
#endif
return result;
}
void fmt::internal::FormatSystemErrorMessage(
fmt::Writer &out, int error_code, fmt::StringRef message) {
Array<char, INLINE_BUFFER_SIZE> buffer;
buffer.resize(INLINE_BUFFER_SIZE);
char *system_message = 0;
for (;;) {
system_message = &buffer[0];
int result = StrError(error_code, system_message, buffer.size());
if (result == 0)
break;
if (result != ERANGE) {
// Can't get error message, report error code instead.
out << message << ": error code = " << error_code;
return;
}
buffer.resize(buffer.size() * 2);
}
out << message << ": " << system_message;
}
#ifdef _WIN32
void fmt::internal::FormatWinErrorMessage(
fmt::Writer &out, int error_code, fmt::StringRef message) {
class String {
private:
LPWSTR str_;
public:
String() : str_() {}
~String() { LocalFree(str_); }
LPWSTR *ptr() { return &str_; }
LPCWSTR c_str() const { return str_; }
};
String system_message;
if (FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, 0,
error_code, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
reinterpret_cast<LPWSTR>(system_message.ptr()), 0, 0)) {
UTF16ToUTF8 utf8_message;
if (!utf8_message.Convert(system_message.c_str())) {
out << message << ": " << utf8_message;
return;
}
}
// Can't get error message, report error code instead.
out << message << ": error code = " << error_code;
}
#endif
// An argument formatter.
template <typename Char>
class fmt::internal::ArgFormatter :
public fmt::internal::ArgVisitor<fmt::internal::ArgFormatter<Char>, void> {
private:
fmt::BasicFormatter<Char> &formatter_;
fmt::BasicWriter<Char> &writer_;
fmt::FormatSpec &spec_;
const Char *format_;
public:
ArgFormatter(fmt::BasicFormatter<Char> &f, fmt::FormatSpec &s, const Char *fmt)
: formatter_(f), writer_(f.writer()), spec_(s), format_(fmt) {}
template <typename T>
void visit_any_int(T value) { writer_.FormatInt(value, spec_); }
template <typename T>
void visit_any_double(T value) { writer_.FormatDouble(value, spec_); }
void visit_char(int value) {
if (spec_.type_ && spec_.type_ != 'c')
fmt::internal::ReportUnknownType(spec_.type_, "char");
typedef typename fmt::BasicWriter<Char>::CharPtr CharPtr;
CharPtr out = CharPtr();
if (spec_.width_ > 1) {
Char fill = static_cast<Char>(spec_.fill());
out = writer_.GrowBuffer(spec_.width_);
if (spec_.align_ == fmt::ALIGN_RIGHT) {
std::fill_n(out, spec_.width_ - 1, fill);
out += spec_.width_ - 1;
} else if (spec_.align_ == fmt::ALIGN_CENTER) {
out = writer_.FillPadding(out, spec_.width_, 1, fill);
} else {
std::fill_n(out + 1, spec_.width_ - 1, fill);
}
} else {
out = writer_.GrowBuffer(1);
}
*out = static_cast<Char>(value);
}
void visit_string(Arg::StringValue<char> value) {
writer_.write_str(value, spec_);
}
void visit_wstring(Arg::StringValue<wchar_t> value) {
writer_.write_str(ignore_incompatible_str<Char>(value), spec_);
}
void visit_pointer(const void *value) {
if (spec_.type_ && spec_.type_ != 'p')
fmt::internal::ReportUnknownType(spec_.type_, "pointer");
spec_.flags_ = fmt::HASH_FLAG;
spec_.type_ = 'x';
writer_.FormatInt(reinterpret_cast<uintptr_t>(value), spec_);
}
void visit_custom(Arg::CustomValue c) {
c.format(&formatter_, c.value, format_);
}
};
template <typename Char>
void fmt::internal::FormatErrorReporter<Char>::operator()(
const Char *s, fmt::StringRef message) const {
if (find_closing_brace(s, num_open_braces))
throw fmt::FormatError(message);
}
// Fills the padding around the content and returns the pointer to the
// content area.
template <typename Char>
typename fmt::BasicWriter<Char>::CharPtr
fmt::BasicWriter<Char>::FillPadding(CharPtr buffer,
unsigned total_size, std::size_t content_size, wchar_t fill) {
std::size_t padding = total_size - content_size;
std::size_t left_padding = padding / 2;
Char fill_char = static_cast<Char>(fill);
std::fill_n(buffer, left_padding, fill_char);
buffer += left_padding;
CharPtr content = buffer;
std::fill_n(buffer + content_size, padding - left_padding, fill_char);
return content;
}
template <typename Char>
template <typename T>
void fmt::BasicWriter<Char>::FormatDouble(T value, const FormatSpec &spec) {
// Check type.
char type = spec.type();
bool upper = false;
switch (type) {
case 0:
type = 'g';
break;
case 'e': case 'f': case 'g': case 'a':
break;
case 'F':
#ifdef _MSC_VER
// MSVC's printf doesn't support 'F'.
type = 'f';
#endif
// Fall through.
case 'E': case 'G': case 'A':
upper = true;
break;
default:
internal::ReportUnknownType(type, "double");
break;
}
char sign = 0;
// Use SignBit instead of value < 0 because the latter is always
// false for NaN.
if (SignBit(static_cast<double>(value))) {
sign = '-';
value = -value;
} else if (spec.sign_flag()) {
sign = spec.plus_flag() ? '+' : ' ';
}
if (value != value) {
// Format NaN ourselves because sprintf's output is not consistent
// across platforms.
std::size_t size = 4;
const char *nan = upper ? " NAN" : " nan";
if (!sign) {
--size;
++nan;
}
CharPtr out = write_str(nan, size, spec);
if (sign)
*out = sign;
return;
}
if (IsInf(static_cast<double>(value))) {
// Format infinity ourselves because sprintf's output is not consistent
// across platforms.
std::size_t size = 4;
const char *inf = upper ? " INF" : " inf";
if (!sign) {
--size;
++inf;
}
CharPtr out = write_str(inf, size, spec);
if (sign)
*out = sign;
return;
}
std::size_t offset = buffer_.size();
unsigned width = spec.width();
if (sign) {
buffer_.reserve(buffer_.size() + (std::max)(width, 1u));
if (width > 0)
--width;
++offset;
}
// Build format string.
enum { MAX_FORMAT_SIZE = 10}; // longest format: %#-*.*Lg
Char format[MAX_FORMAT_SIZE];
Char *format_ptr = format;
*format_ptr++ = '%';
unsigned width_for_sprintf = width;
if (spec.hash_flag())
*format_ptr++ = '#';
if (spec.align() == ALIGN_CENTER) {
width_for_sprintf = 0;
} else {
if (spec.align() == ALIGN_LEFT)
*format_ptr++ = '-';
if (width != 0)
*format_ptr++ = '*';
}
if (spec.precision() >= 0) {
*format_ptr++ = '.';
*format_ptr++ = '*';
}
if (internal::IsLongDouble<T>::VALUE)
*format_ptr++ = 'L';
*format_ptr++ = type;
*format_ptr = '\0';
// Format using snprintf.
Char fill = static_cast<Char>(spec.fill());
for (;;) {
std::size_t size = buffer_.capacity() - offset;
#if _MSC_VER
// MSVC's vsnprintf_s doesn't work with zero size, so reserve
// space for at least one extra character to make the size non-zero.
// Note that the buffer's capacity will increase by more than 1.
if (size == 0) {
buffer_.reserve(offset + 1);
size = buffer_.capacity() - offset;
}
#endif
Char *start = &buffer_[offset];
int n = internal::CharTraits<Char>::FormatFloat(
start, size, format, width_for_sprintf, spec.precision(), value);
if (n >= 0 && offset + n < buffer_.capacity()) {
if (sign) {
if ((spec.align() != ALIGN_RIGHT && spec.align() != ALIGN_DEFAULT) ||
*start != ' ') {
*(start - 1) = sign;
sign = 0;
} else {
*(start - 1) = fill;
}
++n;
}
if (spec.align() == ALIGN_CENTER &&
spec.width() > static_cast<unsigned>(n)) {
unsigned width = spec.width();
CharPtr p = GrowBuffer(width);
std::copy(p, p + n, p + (width - n) / 2);
FillPadding(p, spec.width(), n, fill);
return;
}
if (spec.fill() != ' ' || sign) {
while (*start == ' ')
*start++ = fill;
if (sign)
*(start - 1) = sign;
}
GrowBuffer(n);
return;
}
// If n is negative we ask to increase the capacity by at least 1,
// but as std::vector, the buffer grows exponentially.
buffer_.reserve(n >= 0 ? offset + n + 1 : buffer_.capacity() + 1);
}
}
template <typename Char>
template <typename StringChar>
void fmt::BasicWriter<Char>::write_str(
const Arg::StringValue<StringChar> &str, const FormatSpec &spec) {
// Check if StringChar is convertible to Char.
internal::CharTraits<Char>::convert(StringChar());
if (spec.type_ && spec.type_ != 's')
internal::ReportUnknownType(spec.type_, "string");
const StringChar *s = str.value;
std::size_t size = str.size;
if (size == 0) {
if (!s)
throw FormatError("string pointer is null");
if (*s)
size = std::char_traits<StringChar>::length(s);
}
write_str(s, size, spec);
}
template <typename Char>
inline const Arg
&fmt::BasicFormatter<Char>::ParseArgIndex(const Char *&s) {
unsigned arg_index = 0;
if (*s < '0' || *s > '9') {
if (*s != '}' && *s != ':')
report_error_(s, "invalid argument index in format string");
const Arg &arg = next_arg();
if (error_)
report_error_(s, error_);
return arg;
}
if (next_arg_index_ > 0) {
report_error_(s,
"cannot switch from automatic to manual argument indexing");
}
next_arg_index_ = -1;
arg_index = ParseNonnegativeInt(s, error_);
if (error_)
report_error_(s, error_); // TODO: don't use report_error_
if (arg_index >= args_.size())
report_error_(s, "argument index is out of range in format");
return args_[arg_index];
}
template <typename Char>
void fmt::BasicFormatter<Char>::CheckSign(
const Char *&s, const Arg &arg) {
char sign = static_cast<char>(*s);
if (arg.type > Arg::LAST_NUMERIC_TYPE) {
report_error_(s,
fmt::format("format specifier '{}' requires numeric argument", sign).c_str());
}
if (arg.type == Arg::UINT || arg.type == Arg::ULONG_LONG) {
report_error_(s,
fmt::format("format specifier '{}' requires signed argument", sign).c_str());
}
++s;
}
const Arg &fmt::internal::FormatterBase::next_arg() {
if (next_arg_index_ < 0) {
if (!error_)
error_ = "cannot switch from manual to automatic argument indexing";
return DUMMY_ARG;
}
unsigned arg_index = next_arg_index_++;
if (arg_index < args_.size())
return args_[arg_index];
if (!error_)
error_ = "argument index is out of range in format";
return DUMMY_ARG;
}
const Arg &fmt::internal::FormatterBase::handle_arg_index(unsigned arg_index) {
if (arg_index != UINT_MAX) {
if (next_arg_index_ <= 0) {
next_arg_index_ = -1;
--arg_index;
} else if (!error_) {
error_ = "cannot switch from automatic to manual argument indexing";
}
if (arg_index < args_.size())
return args_[arg_index];
if (!error_)
error_ = "argument index is out of range in format";
return DUMMY_ARG;
}
return next_arg();
}
template <typename Char>
void fmt::internal::PrintfFormatter<Char>::ParseFlags(
FormatSpec &spec, const Char *&s) {
for (;;) {
switch (*s++) {
case '-':
spec.align_ = ALIGN_LEFT;
break;
case '+':
spec.flags_ |= SIGN_FLAG | PLUS_FLAG;
break;
case '0':
spec.fill_ = '0';
break;
case ' ':
spec.flags_ |= SIGN_FLAG;
break;
case '#':
spec.flags_ |= HASH_FLAG;
break;
default:
--s;
return;
}
}
}
template <typename Char>
unsigned fmt::internal::PrintfFormatter<Char>::ParseHeader(
const Char *&s, FormatSpec &spec) {
unsigned arg_index = UINT_MAX;
Char c = *s;
if (c >= '0' && c <= '9') {
// Parse an argument index (if followed by '$') or a width possibly
// preceded with '0' flag(s).
unsigned value = ParseNonnegativeInt(s, error_);
if (*s == '$') { // value is an argument index
++s;
arg_index = value;
} else {
if (c == '0')
spec.fill_ = '0';
if (value != 0) {
// Nonzero value means that we parsed width and don't need to
// parse it or flags again, so return now.
spec.width_ = value;
return arg_index;
}
}
}
ParseFlags(spec, s);
// Parse width.
if (*s >= '0' && *s <= '9') {
spec.width_ = ParseNonnegativeInt(s, error_);
} else if (*s == '*') {
++s;
spec.width_ = WidthHandler(spec).visit(handle_arg_index(UINT_MAX));
}
return arg_index;
}
template <typename Char>
void fmt::internal::PrintfFormatter<Char>::Format(
BasicWriter<Char> &writer, BasicStringRef<Char> format,
const ArgList &args) {
const Char *start = format.c_str();
args_ = args;
next_arg_index_ = 0;
const Char *s = start;
while (*s) {
Char c = *s++;
if (c != '%') continue;
if (*s == c) {
writer.buffer_.append(start, s);
start = ++s;
continue;
}
writer.buffer_.append(start, s - 1);
FormatSpec spec;
spec.align_ = ALIGN_RIGHT;
// Reporting errors is delayed till the format specification is
// completely parsed. This is done to avoid potentially confusing
// error messages for incomplete format strings. For example, in
// sprintf("%2$", 42);
// the format specification is incomplete. In a naive approach we
// would parse 2 as an argument index and report an error that the
// index is out of range which would be rather confusing if the
// use meant "%2d$" rather than "%2$d". If we delay an error, the
// user will get an error that the format string is invalid which
// is OK for both cases.
// Parse argument index, flags and width.
unsigned arg_index = ParseHeader(s, spec);
// Parse precision.
if (*s == '.') {
++s;
if ('0' <= *s && *s <= '9') {
spec.precision_ = ParseNonnegativeInt(s, error_);
} else if (*s == '*') {
++s;
const Arg &arg = handle_arg_index(UINT_MAX);
if (arg.type <= Arg::LAST_INTEGER_TYPE)
spec.precision_ = static_cast<int>(GetIntValue(arg)); // TODO: check for overflow
else if (!error_)
error_ = "precision is not integer";
}
}
const Arg &arg = handle_arg_index(arg_index);
if (spec.hash_flag() && GetIntValue(arg) == 0)
spec.flags_ &= ~HASH_FLAG;
if (spec.fill_ == '0') {
if (arg.type <= Arg::LAST_NUMERIC_TYPE)
spec.align_ = ALIGN_NUMERIC;
else
spec.fill_ = ' '; // Ignore '0' flag for non-numeric types.
}
// Parse length.
switch (*s) {
case 'h':
// TODO: convert to short
case 'l':
case 'j':
case 'z':
case 't':
case 'L':
// TODO: handle length
++s;
break;
}
// Parse type.
if (!*s)
throw FormatError("invalid format string");
if (error_)
throw FormatError(error_);
spec.type_ = static_cast<char>(*s++);
start = s;
// Format argument.
switch (arg.type) {
case Arg::INT:
writer.FormatInt(arg.int_value, spec);
break;
case Arg::UINT:
writer.FormatInt(arg.uint_value, spec);
break;
case Arg::LONG_LONG:
writer.FormatInt(arg.long_long_value, spec);
break;
case Arg::ULONG_LONG:
writer.FormatInt(arg.ulong_long_value, spec);
break;
case Arg::DOUBLE:
writer.FormatDouble(arg.double_value, spec);
break;
case Arg::LONG_DOUBLE:
writer.FormatDouble(arg.long_double_value, spec);
break;
case Arg::CHAR: {
if (spec.type_ && spec.type_ != 'c')
internal::ReportUnknownType(spec.type_, "char");
typedef typename BasicWriter<Char>::CharPtr CharPtr;
CharPtr out = CharPtr();
if (spec.width_ > 1) {
Char fill = static_cast<Char>(spec.fill());
out = writer.GrowBuffer(spec.width_);
if (spec.align_ == ALIGN_RIGHT) {
std::fill_n(out, spec.width_ - 1, fill);
out += spec.width_ - 1;
} else if (spec.align_ == ALIGN_CENTER) {
out = writer.FillPadding(out, spec.width_, 1, fill);
} else {
std::fill_n(out + 1, spec.width_ - 1, fill);
}
} else {
out = writer.GrowBuffer(1);
}
*out = static_cast<Char>(arg.int_value);
break;
}
case Arg::STRING:
writer.write_str(arg.string, spec);
break;
case Arg::WSTRING:
writer.write_str(ignore_incompatible_str<Char>(arg.wstring), spec);
break;
case Arg::POINTER:
if (spec.type_ && spec.type_ != 'p')
internal::ReportUnknownType(spec.type_, "pointer");
spec.flags_= HASH_FLAG;
spec.type_ = 'x';
writer.FormatInt(reinterpret_cast<uintptr_t>(arg.pointer_value), spec);
break;
case Arg::CUSTOM:
if (spec.type_)
internal::ReportUnknownType(spec.type_, "object");
arg.custom.format(&writer, arg.custom.value, "s");
break;
default:
assert(false);
break;
}
}
writer.buffer_.append(start, s);
}
template <typename Char>
const Char *fmt::BasicFormatter<Char>::format(
const Char *format_str, const Arg &arg) {
const Char *s = format_str;
const char *error = 0;
FormatSpec spec;
if (*s == ':') {
if (arg.type == Arg::CUSTOM) {
arg.custom.format(this, arg.custom.value, s);
return find_closing_brace(s) + 1;
}
++s;
// Parse fill and alignment.
if (Char c = *s) {
const Char *p = s + 1;
spec.align_ = ALIGN_DEFAULT;
do {
switch (*p) {
case '<':
spec.align_ = ALIGN_LEFT;
break;
case '>':
spec.align_ = ALIGN_RIGHT;
break;
case '=':
spec.align_ = ALIGN_NUMERIC;
break;
case '^':
spec.align_ = ALIGN_CENTER;
break;
}
if (spec.align_ != ALIGN_DEFAULT) {
if (p != s) {
if (c == '}') break;
if (c == '{')
report_error_(s, "invalid fill character '{'");
s += 2;
spec.fill_ = c;
} else ++s;
if (spec.align_ == ALIGN_NUMERIC && arg.type > Arg::LAST_NUMERIC_TYPE)
report_error_(s, "format specifier '=' requires numeric argument");
break;
}
} while (--p >= s);
}
// Parse sign.
switch (*s) {
case '+':
CheckSign(s, arg);
spec.flags_ |= SIGN_FLAG | PLUS_FLAG;