/
printf.jl
1245 lines (1159 loc) · 37.5 KB
/
printf.jl
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
# This file is a part of Julia. License is MIT: http://julialang.org/license
module Printf
using Base.Grisu
export @printf, @sprintf
### printf formatter generation ###
const SmallFloatingPoint = Union{Float64,Float32,Float16}
const SmallNumber = Union{SmallFloatingPoint,Base.BitInteger}
function gen(s::AbstractString)
args = []
blk = Expr(:block, :(local neg, pt, len, exp, do_out, args))
for x in parse(s)
if isa(x,AbstractString)
push!(blk.args, :(write(out, $(length(x)==1 ? x[1] : x))))
else
c = lowercase(x[end])
f = c=='f' ? gen_f :
c=='e' ? gen_e :
c=='a' ? gen_a :
c=='g' ? gen_g :
c=='c' ? gen_c :
c=='s' ? gen_s :
c=='p' ? gen_p :
gen_d
arg, ex = f(x...)
push!(args, arg)
push!(blk.args, ex)
end
end
push!(blk.args, :nothing)
return args, blk
end
### printf format string parsing ###
function parse(s::AbstractString)
# parse format string in to stings and format tuples
list = []
i = j = start(s)
while !done(s,j)
c, k = next(s,j)
if c == '%'
isempty(s[i:j-1]) || push!(list, s[i:j-1])
flags, width, precision, conversion, k = parse1(s,k)
'\'' in flags && error("printf format flag ' not yet supported")
conversion == 'n' && error("printf feature %n not supported")
push!(list, conversion == '%' ? "%" : (flags,width,precision,conversion))
i = j = k
else
j = k
end
end
isempty(s[i:end]) || push!(list, s[i:end])
# coalesce adjacent strings
i = 1
while i < length(list)
if isa(list[i],AbstractString)
for j = i+1:length(list)
if !isa(list[j],AbstractString)
j -= 1
break
end
list[i] *= list[j]
end
deleteat!(list,i+1:j)
end
i += 1
end
return list
end
## parse a single printf specifier ##
# printf specifiers:
# % # start
# (\d+\$)? # arg (not supported)
# [\-\+#0' ]* # flags
# (\d+)? # width
# (\.\d*)? # precision
# (h|hh|l|ll|L|j|t|z|q)? # modifier (ignored)
# [diouxXeEfFgGaAcCsSp%] # conversion
next_or_die(s::AbstractString, k) = !done(s,k) ? next(s,k) :
throw(ArgumentError("invalid printf format string: $(repr(s))"))
function parse1(s::AbstractString, k::Integer)
j = k
width = 0
precision = -1
c, k = next_or_die(s,k)
# handle %%
if c == '%'
return "", width, precision, c, k
end
# parse flags
while c in "#0- + '"
c, k = next_or_die(s,k)
end
flags = String(s[j:k-2])
# parse width
while '0' <= c <= '9'
width = 10*width + c-'0'
c, k = next_or_die(s,k)
end
# parse precision
if c == '.'
c, k = next_or_die(s,k)
if '0' <= c <= '9'
precision = 0
while '0' <= c <= '9'
precision = 10*precision + c-'0'
c, k = next_or_die(s,k)
end
end
end
# parse length modifer (ignored)
if c == 'h' || c == 'l'
prev = c
c, k = next_or_die(s,k)
if c == prev
c, k = next_or_die(s,k)
end
elseif c in "Ljqtz"
c, k = next_or_die(s,k)
end
# validate conversion
if !(c in "diouxXDOUeEfFgGaAcCsSpn")
throw(ArgumentError("invalid printf format string: $(repr(s))"))
end
# TODO: warn about silly flag/conversion combinations
flags, width, precision, c, k
end
### printf formatter generation ###
function special_handler(flags::String, width::Int)
@gensym x
blk = Expr(:block)
pad = '-' in flags ? rpad : lpad
pos = '+' in flags ? "+" :
' ' in flags ? " " : ""
abn = quote
isnan($x) ? $(pad("NaN", width)) :
$x < 0 ? $(pad("-Inf", width)) :
$(pad("$(pos)Inf", width))
end
ex = :(isfinite($x) ? $blk : write(out, $abn))
x, ex, blk
end
function pad(m::Int, n, c::Char)
if m <= 1
:($n > 0 && write(out,$c))
else
@gensym i
quote
$i = $n
while $i > 0
write(out,$c)
$i -= 1
end
end
end
end
function dynamic_pad(m, val, c::Char)
@gensym i
quote
if $m <= 1
$val > 0 && write(out,$c)
else
$i = $val
while $i > 0
write(out,$c)
$i -= 1
end
end
end
end
function print_fixed(out, precision, pt, ndigits, trailingzeros=true)
pdigits = pointer(DIGITS)
if pt <= 0
# 0.0dddd0
write(out, '0')
write(out, '.')
precision += pt
while pt < 0
write(out, '0')
pt += 1
end
unsafe_write(out, pdigits, ndigits)
precision -= ndigits
elseif ndigits <= pt
# dddd000.000000
unsafe_write(out, pdigits, ndigits)
while ndigits < pt
write(out, '0')
ndigits += 1
end
if trailingzeros
write(out, '.')
end
else # 0 < pt < ndigits
# dd.dd0000
ndigits -= pt
unsafe_write(out, pdigits, pt)
write(out, '.')
unsafe_write(out, pdigits+pt, ndigits)
precision -= ndigits
end
if trailingzeros
while precision > 0
write(out, '0')
precision -= 1
end
end
end
function print_exp_e(out, exp::Integer)
write(out, exp < 0 ? '-' : '+')
exp = abs(exp)
d = div(exp,100)
if d > 0
if d >= 10
print(out, exp)
return
end
write(out, Char('0'+d))
end
exp = rem(exp,100)
write(out, Char('0'+div(exp,10)))
write(out, Char('0'+rem(exp,10)))
end
function print_exp_a(out, exp::Integer)
write(out, exp < 0 ? '-' : '+')
exp = abs(exp)
print(out, exp)
end
function gen_d(flags::String, width::Int, precision::Int, c::Char)
# print integer:
# [dDiu]: print decimal digits
# [o]: print octal digits
# [x]: print hex digits, lowercase
# [X]: print hex digits, uppercase
#
# flags:
# (#): prefix hex with 0x/0X; octal leads with 0
# (0): pad left with zeros
# (-): left justify
# ( ): precede non-negative values with " "
# (+): precede non-negative values with "+"
#
x, ex, blk = special_handler(flags,width)
# interpret the number
prefix = ""
if lowercase(c)=='o'
fn = '#' in flags ? :decode_0ct : :decode_oct
elseif c=='x'
'#' in flags && (prefix = "0x")
fn = :decode_hex
elseif c=='X'
'#' in flags && (prefix = "0X")
fn = :decode_HEX
else
fn = :decode_dec
end
push!(blk.args, :((do_out, args) = $fn(out, $x, $flags, $width, $precision, $c)))
ifblk = Expr(:if, :do_out, Expr(:block))
push!(blk.args, ifblk)
blk = ifblk.args[2]
push!(blk.args, :((len, pt, neg) = args))
# calculate padding
width -= length(prefix)
space_pad = width > max(1,precision) && '-' in flags ||
precision < 0 && width > 1 && !('0' in flags) ||
precision >= 0 && width > precision
padding = nothing
if precision < 1; precision = 1; end
if space_pad
if '+' in flags || ' ' in flags
width -= 1
if width > precision
padding = :($width-(pt > $precision ? pt : $precision))
end
else
if width > precision
padding = :($width-neg-(pt > $precision ? pt : $precision))
end
end
end
# print space padding
if padding !== nothing && !('-' in flags)
push!(blk.args, pad(width-precision, padding, ' '))
end
# print sign
'+' in flags ? push!(blk.args, :(write(out, neg?'-':'+'))) :
' ' in flags ? push!(blk.args, :(write(out, neg?'-':' '))) :
push!(blk.args, :(neg && write(out, '-')))
# print prefix
for ch in prefix
push!(blk.args, :(write(out, $ch)))
end
# print zero padding & leading zeros
if space_pad && precision > 1
push!(blk.args, pad(precision-1, :($precision-pt), '0'))
elseif !space_pad && width > 1
zeros = '+' in flags || ' ' in flags ? :($(width-1)-pt) : :($width-neg-pt)
push!(blk.args, pad(width-1, zeros, '0'))
end
# print integer
push!(blk.args, :(unsafe_write(out, pointer(DIGITS), pt)))
# print padding
if padding !== nothing && '-' in flags
push!(blk.args, pad(width-precision, padding, ' '))
end
# return arg, expr
:(($x)::Real), ex
end
function gen_f(flags::String, width::Int, precision::Int, c::Char)
# print to fixed trailing precision
# [fF]: the only choice
#
# flags
# (#): always print a decimal point
# (0): pad left with zeros
# (-): left justify
# ( ): precede non-negative values with " "
# (+): precede non-negative values with "+"
#
x, ex, blk = special_handler(flags,width)
# interpret the number
if precision < 0; precision = 6; end
push!(blk.args, :((do_out, args) = fix_dec(out, $x, $flags, $width, $precision, $c)))
ifblk = Expr(:if, :do_out, Expr(:block))
push!(blk.args, ifblk)
blk = ifblk.args[2]
push!(blk.args, :((len, pt, neg) = args))
# calculate padding
padding = nothing
if precision > 0 || '#' in flags
width -= precision+1
end
if '+' in flags || ' ' in flags
width -= 1
if width > 1
padding = :($width-(pt > 0 ? pt : 1))
end
else
if width > 1
padding = :($width-(pt > 0 ? pt : 1)-neg)
end
end
# print space padding
if padding !== nothing && !('-' in flags) && !('0' in flags)
push!(blk.args, pad(width-1, padding, ' '))
end
# print sign
'+' in flags ? push!(blk.args, :(write(out, neg?'-':'+'))) :
' ' in flags ? push!(blk.args, :(write(out, neg?'-':' '))) :
push!(blk.args, :(neg && write(out, '-')))
# print zero padding
if padding !== nothing && !('-' in flags) && '0' in flags
push!(blk.args, pad(width-1, padding, '0'))
end
# print digits
if precision > 0
push!(blk.args, :(print_fixed(out,$precision,pt,len)))
else
push!(blk.args, :(unsafe_write(out, pointer(DIGITS), len)))
push!(blk.args, :(while pt >= (len+=1) write(out,'0') end))
'#' in flags && push!(blk.args, :(write(out, '.')))
end
# print space padding
if padding !== nothing && '-' in flags
push!(blk.args, pad(width-1, padding, ' '))
end
# return arg, expr
:(($x)::Real), ex
end
function gen_e(flags::String, width::Int, precision::Int, c::Char, inside_g::Bool=false)
# print float in scientific form:
# [e]: use 'e' to introduce exponent
# [E]: use 'E' to introduce exponent
#
# flags:
# (#): always print a decimal point
# (0): pad left with zeros
# (-): left justify
# ( ): precede non-negative values with " "
# (+): precede non-negative values with "+"
#
x, ex, blk = if inside_g
@gensym x
blk = Expr(:block)
x, blk, blk
else
special_handler(flags,width)
end
# interpret the number
if precision < 0; precision = 6; end
ndigits = min(precision+1,length(DIGITS)-1)
push!(blk.args, :((do_out, args) = ini_dec(out,$x,$ndigits, $flags, $width, $precision, $c)))
ifblk = Expr(:if, :do_out, Expr(:block))
push!(blk.args, ifblk)
blk = ifblk.args[2]
push!(blk.args, :((len, pt, neg) = args))
push!(blk.args, :(exp = pt-1))
expmark = isupper(c) ? "E" : "e"
if precision==0 && '#' in flags
expmark = string(".",expmark)
end
# calculate padding
padding = nothing
width -= precision+length(expmark)+(precision>0)+4
# 4 = leading + expsign + 2 exp digits
if '+' in flags || ' ' in flags
width -= 1 # for the sign indicator
if width > 0
padding = quote
padn=$width
if (exp<=-100)|(100<=exp)
if isa($x,SmallNumber)
padn -= 1
else
padn -= Base.ndigits0z(exp) - 2
end
end
padn
end
end
else
if width > 0
padding = quote
padn=$width-neg
if (exp<=-100)|(100<=exp)
if isa($x,SmallNumber)
padn -= 1
else
padn -= Base.ndigits0z(exp) - 2
end
end
padn
end
end
end
# print space padding
if padding !== nothing && !('-' in flags) && !('0' in flags)
push!(blk.args, pad(width, padding, ' '))
end
# print sign
'+' in flags ? push!(blk.args, :(write(out, neg?'-':'+'))) :
' ' in flags ? push!(blk.args, :(write(out, neg?'-':' '))) :
push!(blk.args, :(neg && write(out, '-')))
# print zero padding
if padding !== nothing && !('-' in flags) && '0' in flags
push!(blk.args, pad(width, padding, '0'))
end
# print digits
push!(blk.args, :(write(out, DIGITS[1])))
if precision > 0
if inside_g && !('#' in flags)
push!(blk.args, :(endidx = $ndigits;
while endidx > 1 && DIGITS[endidx] == UInt8('0')
endidx -= 1
end;
if endidx > 1
write(out, '.')
unsafe_write(out, pointer(DIGITS)+1, endidx-1)
end
))
else
push!(blk.args, :(write(out, '.')))
push!(blk.args, :(unsafe_write(out, pointer(DIGITS)+1, $(ndigits-1))))
if ndigits < precision+1
n = precision+1-ndigits
push!(blk.args, pad(n, n, '0'))
end
end
end
for ch in expmark
push!(blk.args, :(write(out, $ch)))
end
push!(blk.args, :(print_exp_e(out, exp)))
# print space padding
if padding !== nothing && '-' in flags
push!(blk.args, pad(width, padding, ' '))
end
# return arg, expr
:(($x)::Real), ex
end
function gen_a(flags::String, width::Int, precision::Int, c::Char)
# print float in hexadecimal format
# [a]: lowercase hex float, e.g. -0x1.cfp-2
# [A]: uppercase hex float, e.g. -0X1.CFP-2
#
# flags:
# (#): always print a decimal point
# (0): pad left with zeros
# (-): left justify
# ( ): precede non-negative values with " "
# (+): precede non-negative values with "+"
#
x, ex, blk = special_handler(flags,width)
if c == 'A'
hexmark, expmark = "0X", "P"
fn = :ini_HEX
else
hexmark, expmark = "0x", "p"
fn = :ini_hex
end
# if no precision, print max non-zero
if precision < 0
push!(blk.args, :((do_out, args) = $fn(out,$x, $flags, $width, $precision, $c)))
else
ndigits = min(precision+1,length(DIGITS)-1)
push!(blk.args, :((do_out, args) = $fn(out,$x,$ndigits, $flags, $width, $precision, $c)))
end
ifblk = Expr(:if, :do_out, Expr(:block))
push!(blk.args, ifblk)
blk = ifblk.args[2]
push!(blk.args, :((len, exp, neg) = args))
if precision==0 && '#' in flags
expmark = string(".",expmark)
end
# calculate padding
padding = nothing
if precision > 0
width -= precision+length(hexmark)+length(expmark)+4
# 4 = leading + expsign + 1 exp digit + decimal
else
width -= length(hexmark)+length(expmark)+3+(precision<0 && '#' in flags)
# 3 = leading + expsign + 1 exp digit
end
if '+' in flags || ' ' in flags
width -= 1 # for the sign indicator
if width > 0
padding = :($(width+1) - Base.ndigits(exp))
end
else
if width > 0
padding = :($(width+1) - neg - Base.ndigits(exp))
end
end
if precision < 0 && width > 0
if '#' in flags
padding = :($padding - (len-1))
else
padding = :($padding - (len>1?len:0))
end
end
# print space padding
if padding !== nothing && !('-' in flags) && !('0' in flags)
push!(blk.args, pad(width, padding, ' '))
end
# print sign
'+' in flags ? push!(blk.args, :(write(out, neg?'-':'+'))) :
' ' in flags ? push!(blk.args, :(write(out, neg?'-':' '))) :
push!(blk.args, :(neg && write(out, '-')))
# hex prefix
for ch in hexmark
push!(blk.args, :(write(out, $ch)))
end
# print zero padding
if padding !== nothing && !('-' in flags) && '0' in flags
push!(blk.args, pad(width, padding, '0'))
end
# print digits
push!(blk.args, :(write(out, DIGITS[1])))
if precision > 0
push!(blk.args, :(write(out, '.')))
push!(blk.args, :(unsafe_write(out, pointer(DIGITS)+1, $(ndigits-1))))
if ndigits < precision+1
n = precision+1-ndigits
push!(blk.args, pad(n, n, '0'))
end
elseif precision < 0
ifvpblk = Expr(:if, :(len > 1), Expr(:block))
vpblk = ifvpblk.args[2]
if '#' in flags
push!(blk.args, :(write(out, '.')))
else
push!(vpblk.args, :(write(out, '.')))
end
push!(vpblk.args, :(unsafe_write(out, pointer(DIGITS)+1, len-1)))
push!(blk.args, ifvpblk)
end
for ch in expmark
push!(blk.args, :(write(out, $ch)))
end
push!(blk.args, :(print_exp_a(out, exp)))
# print space padding
if padding !== nothing && '-' in flags
push!(blk.args, pad(width, padding, ' '))
end
# return arg, expr
:(($x)::Real), ex
end
function gen_c(flags::String, width::Int, precision::Int, c::Char)
# print a character:
# [cC]: both the same for us (Unicode)
#
# flags:
# (0): pad left with zeros
# (-): left justify
#
@gensym x
blk = Expr(:block, :($x = Char($x)))
if width > 1 && !('-' in flags)
p = '0' in flags ? '0' : ' '
push!(blk.args, pad(width-1, :($width-charwidth($x)), p))
end
push!(blk.args, :(write(out, $x)))
if width > 1 && '-' in flags
push!(blk.args, pad(width-1, :($width-charwidth($x)), ' '))
end
:(($x)::Integer), blk
end
function _limit(s, prec)
prec >= sizeof(s) && return s
p = prevind(s, prec+1)
n = nextind(s, p)-1
s[1:(prec>=n?n:prevind(s,p))]
end
function gen_s(flags::String, width::Int, precision::Int, c::Char)
# print a string:
# [sS]: both the same for us (Unicode)
#
# flags:
# (-): left justify
#
@gensym x
blk = Expr(:block)
if width > 0
if !('#' in flags)
push!(blk.args, :($x = string($x)))
else
push!(blk.args, :($x = repr($x)))
end
if precision!=-1
push!(blk.args, :($x = _limit($x, $precision)))
end
if !('-' in flags)
push!(blk.args, pad(width, :($width-strwidth($x)), ' '))
end
push!(blk.args, :(write(out, $x)))
if '-' in flags
push!(blk.args, pad(width, :($width-strwidth($x)), ' '))
end
else
if precision!=-1
push!(blk.args, :(io = IOBuffer()))
else
push!(blk.args, :(io = out))
end
if !('#' in flags)
push!(blk.args, :(print(io, $x)))
else
push!(blk.args, :(show(io, $x)))
end
if precision!=-1
push!(blk.args, :(write(out, _limit(String(take!(io)), $precision))))
end
end
:(($x)::Any), blk
end
# TODO: faster pointer printing.
function gen_p(flags::String, width::Int, precision::Int, c::Char)
# print pointer:
# [p]: the only option
#
@gensym x
blk = Expr(:block)
ptrwidth = Sys.WORD_SIZE>>2
width -= ptrwidth+2
if width > 0 && !('-' in flags)
push!(blk.args, pad(width, width, ' '))
end
push!(blk.args, :(write(out, '0')))
push!(blk.args, :(write(out, 'x')))
push!(blk.args, :(write(out, String(hex(unsigned($x), $ptrwidth)))))
if width > 0 && '-' in flags
push!(blk.args, pad(width, width, ' '))
end
:(($x)::Ptr), blk
end
function gen_g(flags::String, width::Int, precision::Int, c::Char)
# print to fixed trailing precision
# [g]: lower case e on scientific
# [G]: Upper case e on scientific
#
# flags
# (#): always print a decimal point
# (0): pad left with zeros
# (-): left justify
# ( ): precede non-negative values with " "
# (+): precede non-negative values with "+"
#
x, ex, blk = special_handler(flags,width)
if precision < 0; precision = 6; end
ndigits = min(precision+1,length(DIGITS)-1)
# See if anyone else wants to handle it
push!(blk.args, :((do_out, args) = ini_dec(out,$x,$ndigits, $flags, $width, $precision, $c)))
ifblk = Expr(:if, :do_out, Expr(:block))
push!(blk.args, ifblk)
blk = ifblk.args[2]
push!(blk.args, :((len, pt, neg) = args))
push!(blk.args, :(exp = pt-1))
push!(blk.args, :(do_f = $precision > exp >= -4)) # Should we interpret like %f or %e?
feblk = Expr(:if, :do_f, Expr(:block), Expr(:block))
push!(blk.args, feblk)
fblk = feblk.args[2]
eblk = feblk.args[3]
### %f branch
# Follow the same logic as gen_f() but more work has to be deferred until runtime
# because precision is unknown until then.
push!(fblk.args, :(fprec = $precision - (exp+1)))
push!(fblk.args, :((do_out, args) = fix_dec(out, $x, $flags, $width, fprec, $c - 1)))
fifblk = Expr(:if, :do_out, Expr(:block))
push!(fblk.args, fifblk)
blk = fifblk.args[2]
push!(blk.args, :((len, pt, neg) = args))
push!(blk.args, :(padding = nothing))
push!(blk.args, :(width = $width))
# need to compute value before left-padding since trailing zeros are elided
push!(blk.args, :(tmpout = IOBuffer()))
push!(blk.args, :(print_fixed(tmpout,fprec,pt,len,$('#' in flags))))
push!(blk.args, :(tmpstr = String(take!(tmpout))))
push!(blk.args, :(width -= length(tmpstr)))
if '+' in flags || ' ' in flags
push!(blk.args, :(width -= 1))
else
push!(blk.args, :(if neg width -= 1; end))
end
push!(blk.args, :(if width >= 1 padding = width; end))
# print space padding
if !('-' in flags) && !('0' in flags)
padexpr = dynamic_pad(:width, :padding, ' ')
push!(blk.args, :(if padding !== nothing
$padexpr; end))
end
# print sign
'+' in flags ? push!(blk.args, :(write(out, neg?'-':'+'))) :
' ' in flags ? push!(blk.args, :(write(out, neg?'-':' '))) :
push!(blk.args, :(neg && write(out, '-')))
# print zero padding
if !('-' in flags) && '0' in flags
padexpr = dynamic_pad(:width, :padding, '0')
push!(blk.args, :(if padding !== nothing
$padexpr; end))
end
# finally print value
push!(blk.args, :(write(out,tmpstr)))
# print space padding
if '-' in flags
padexpr = dynamic_pad(:width, :padding, ' ')
push!(blk.args, :(if padding !== nothing
$padexpr; end))
end
### %e branch
# Here we can do all the work at macro expansion time
var, eex = gen_e(flags, width, precision-1, c, true)
push!(eblk.args, :($(var.args[1]) = $x))
push!(eblk.args, eex)
:(($x)::Real), ex
end
### core unsigned integer decoding functions ###
macro handle_zero(ex)
quote
if $(esc(ex)) == 0
DIGITS[1] = '0'
return Int32(1), Int32(1), $(esc(:neg))
end
end
end
decode_oct(out, d, flags::String, width::Int, precision::Int, c::Char) = (true, decode_oct(d))
decode_0ct(out, d, flags::String, width::Int, precision::Int, c::Char) = (true, decode_0ct(d))
decode_dec(out, d, flags::String, width::Int, precision::Int, c::Char) = (true, decode_dec(d))
decode_hex(out, d, flags::String, width::Int, precision::Int, c::Char) = (true, decode_hex(d))
decode_HEX(out, d, flags::String, width::Int, precision::Int, c::Char) = (true, decode_HEX(d))
fix_dec(out, d, flags::String, width::Int, precision::Int, c::Char) = (true, fix_dec(d, precision))
ini_dec(out, d, ndigits::Int, flags::String, width::Int, precision::Int, c::Char) = (true, ini_dec(d, ndigits))
ini_hex(out, d, ndigits::Int, flags::String, width::Int, precision::Int, c::Char) = (true, ini_hex(d, ndigits))
ini_HEX(out, d, ndigits::Int, flags::String, width::Int, precision::Int, c::Char) = (true, ini_HEX(d, ndigits))
ini_hex(out, d, flags::String, width::Int, precision::Int, c::Char) = (true, ini_hex(d))
ini_HEX(out, d, flags::String, width::Int, precision::Int, c::Char) = (true, ini_HEX(d))
# fallbacks for Real types without explicit decode_* implementation
decode_oct(d::Real) = decode_oct(Integer(d))
decode_0ct(d::Real) = decode_0ct(Integer(d))
decode_dec(d::Real) = decode_dec(Integer(d))
decode_hex(d::Real) = decode_hex(Integer(d))
decode_HEX(d::Real) = decode_HEX(Integer(d))
handlenegative(d::Unsigned) = (false, d)
function handlenegative(d::Integer)
if d < 0
return true, unsigned(oftype(d,-d))
else
return false, unsigned(d)
end
end
function decode_oct(d::Integer)
neg, x = handlenegative(d)
@handle_zero x
pt = i = div((sizeof(x)<<3)-leading_zeros(x)+2,3)
while i > 0
DIGITS[i] = '0'+(x&0x7)
x >>= 3
i -= 1
end
return Int32(pt), Int32(pt), neg
end
function decode_0ct(d::Integer)
neg, x = handlenegative(d)
# doesn't need special handling for zero
pt = i = div((sizeof(x)<<3)-leading_zeros(x)+5,3)
while i > 0
DIGITS[i] = '0'+(x&0x7)
x >>= 3
i -= 1
end
return Int32(pt), Int32(pt), neg
end
function decode_dec(d::Integer)
neg, x = handlenegative(d)
@handle_zero x
pt = i = Base.ndigits0z(x)
while i > 0
DIGITS[i] = '0'+rem(x,10)
x = div(x,10)
i -= 1
end
return Int32(pt), Int32(pt), neg
end
function decode_hex(d::Integer, symbols::Array{UInt8,1})
neg, x = handlenegative(d)
@handle_zero x
pt = i = (sizeof(x)<<1)-(leading_zeros(x)>>2)
while i > 0
DIGITS[i] = symbols[(x&0xf)+1]
x >>= 4
i -= 1
end
return Int32(pt), Int32(pt), neg
end
const hex_symbols = b"0123456789abcdef"
const HEX_symbols = b"0123456789ABCDEF"
decode_hex(x::Integer) = decode_hex(x,hex_symbols)
decode_HEX(x::Integer) = decode_hex(x,HEX_symbols)
function decode(b::Int, x::BigInt)
neg = x.size < 0
pt = Base.ndigits(x, abs(b))
length(DIGITS) < pt+1 && resize!(DIGITS, pt+1)
neg && (x.size = -x.size)
ccall((:__gmpz_get_str, :libgmp), Cstring,
(Ptr{UInt8}, Cint, Ptr{BigInt}), DIGITS, b, &x)
neg && (x.size = -x.size)
return Int32(pt), Int32(pt), neg
end
decode_oct(x::BigInt) = decode(8, x)
decode_dec(x::BigInt) = decode(10, x)
decode_hex(x::BigInt) = decode(16, x)
decode_HEX(x::BigInt) = decode(-16, x)
function decode_0ct(x::BigInt)
neg = x.size < 0
DIGITS[1] = '0'
if x.size == 0
return Int32(1), Int32(1), neg
end
pt = Base.ndigits0z(x, 8) + 1
length(DIGITS) < pt+1 && resize!(DIGITS, pt+1)
neg && (x.size = -x.size)
p = convert(Ptr{UInt8}, DIGITS) + 1
ccall((:__gmpz_get_str, :libgmp), Cstring,
(Ptr{UInt8}, Cint, Ptr{BigInt}), p, 8, &x)
neg && (x.size = -x.size)
return neg, Int32(pt), Int32(pt)
end
### decoding functions directly used by printf generated code ###
# decode_*(x)=> fixed precision, to 0th place, filled out
# fix_*(x,n) => fixed precision, to nth place, not filled out
# ini_*(x,n) => n initial digits, filled out
# alternate versions:
# *_0ct(x,n) => ensure that the first octal digits is zero
# *_HEX(x,n) => use uppercase digits for hexadecimal
# - returns (len, point, neg)
# - implies len = point
#
function decode_dec(x::SmallFloatingPoint)
if x == 0.0
DIGITS[1] = '0'
return (Int32(1), Int32(1), false)
end
len,pt,neg = grisu(x,Grisu.FIXED,0)
if len == 0
DIGITS[1] = '0'
return (Int32(1), Int32(1), false)
else
for i = len+1:pt
DIGITS[i] = '0'
end
end
return Int32(len), Int32(pt), neg
end
# TODO: implement decode_oct, decode_0ct, decode_hex, decode_HEX for SmallFloatingPoint
## fix decoding functions ##
#
# - returns (neg, point, len)
# - if len less than point, trailing zeros implied
#
# fallback for Real types without explicit fix_dec implementation
fix_dec(x::Real, n::Int) = fix_dec(float(x),n)
fix_dec(x::Integer, n::Int) = decode_dec(x)
function fix_dec(x::SmallFloatingPoint, n::Int)
if n > length(DIGITS)-1; n = length(DIGITS)-1; end
len,pt,neg = grisu(x,Grisu.FIXED,n)
if len == 0
DIGITS[1] = '0'
return (Int32(1), Int32(1), neg)
end
return Int32(len), Int32(pt), neg
end
## ini decoding functions ##
#
# - returns (neg, point, len)
# - implies len = n (requested digits)
#
# fallback for Real types without explicit fix_dec implementation
ini_dec(x::Real, n::Int) = ini_dec(float(x),n)
function ini_dec(d::Integer, n::Int)
neg, x = handlenegative(d)
k = ndigits(x)
if k <= n
pt = k
for i = k:-1:1
DIGITS[i] = '0'+rem(x,10)
x = div(x,10)
end
for i = k+1:n
DIGITS[i] = '0'
end
else
p = Base.powers_of_ten[k-n+1]
r = rem(x,p)
if r >= (p>>1)
x += p
if x >= Base.powers_of_ten[k+1]
p *= 10
k += 1
end
end
pt = k
x = div(x,p)
for i = n:-1:1
DIGITS[i] = '0'+rem(x,10)
x = div(x,10)
end
end