This repository was archived by the owner on Feb 13, 2025. It is now read-only.
Repository navigation
Expand file tree
/
Copy pathast_unparse.c
More file actions
937 lines (828 loc) · 24.6 KB
/
Copy pathast_unparse.c
File metadata and controls
937 lines (828 loc) · 24.6 KB
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
#include <stdbool.h>
#include "Python.h"
#include "Python-ast.h"
static PyObject *_str_open_br;
static PyObject *_str_dbl_open_br;
static PyObject *_str_close_br;
static PyObject *_str_dbl_close_br;
/* Forward declarations for recursion via helper functions. */
static PyObject *
expr_as_unicode(expr_ty e, int level);
static int
append_ast_expr(_PyUnicodeWriter *writer, expr_ty e, int level);
static int
append_joinedstr(_PyUnicodeWriter *writer, expr_ty e, bool is_format_spec);
static int
append_formattedvalue(_PyUnicodeWriter *writer, expr_ty e, bool is_format_spec);
static int
append_ast_slice(_PyUnicodeWriter *writer, slice_ty slice);
static int
append_charp(_PyUnicodeWriter *writer, const char *charp)
{
return _PyUnicodeWriter_WriteASCIIString(writer, charp, -1);
}
#define APPEND_STR_FINISH(str) do { \
return append_charp(writer, (str)); \
} while (0)
#define APPEND_STR(str) do { \
if (-1 == append_charp(writer, (str))) { \
return -1; \
} \
} while (0)
#define APPEND_STR_IF(cond, str) do { \
if ((cond) && -1 == append_charp(writer, (str))) { \
return -1; \
} \
} while (0)
#define APPEND_STR_IF_NOT_FIRST(str) do { \
APPEND_STR_IF(!first, (str)); \
first = false; \
} while (0)
#define APPEND_EXPR(expr, pr) do { \
if (-1 == append_ast_expr(writer, (expr), (pr))) { \
return -1; \
} \
} while (0)
#define APPEND(type, value) do { \
if (-1 == append_ast_ ## type(writer, (value))) { \
return -1; \
} \
} while (0)
static int
append_repr(_PyUnicodeWriter *writer, PyObject *obj)
{
int ret;
PyObject *repr;
repr = PyObject_Repr(obj);
if (!repr) {
return -1;
}
ret = _PyUnicodeWriter_WriteStr(writer, repr);
Py_DECREF(repr);
return ret;
}
/* Priority levels */
enum {
PR_TUPLE,
PR_TEST, /* 'if'-'else', 'lambda' */
PR_OR, /* 'or' */
PR_AND, /* 'and' */
PR_NOT, /* 'not' */
PR_CMP, /* '<', '>', '==', '>=', '<=', '!=',
'in', 'not in', 'is', 'is not' */
PR_EXPR,
PR_BOR = PR_EXPR, /* '|' */
PR_BXOR, /* '^' */
PR_BAND, /* '&' */
PR_SHIFT, /* '<<', '>>' */
PR_ARITH, /* '+', '-' */
PR_TERM, /* '*', '@', '/', '%', '//' */
PR_FACTOR, /* unary '+', '-', '~' */
PR_POWER, /* '**' */
PR_AWAIT, /* 'await' */
PR_ATOM,
};
static int
append_ast_boolop(_PyUnicodeWriter *writer, expr_ty e, int level)
{
Py_ssize_t i, value_count;
asdl_seq *values;
const char *op = (e->v.BoolOp.op == And) ? " and " : " or ";
int pr = (e->v.BoolOp.op == And) ? PR_AND : PR_OR;
APPEND_STR_IF(level > pr, "(");
values = e->v.BoolOp.values;
value_count = asdl_seq_LEN(values);
for (i = 0; i < value_count; ++i) {
APPEND_STR_IF(i > 0, op);
APPEND_EXPR((expr_ty)asdl_seq_GET(values, i), pr + 1);
}
APPEND_STR_IF(level > pr, ")");
return 0;
}
static int
append_ast_binop(_PyUnicodeWriter *writer, expr_ty e, int level)
{
const char *op;
int pr;
bool rassoc = false; /* is right-associative? */
switch (e->v.BinOp.op) {
case Add: op = " + "; pr = PR_ARITH; break;
case Sub: op = " - "; pr = PR_ARITH; break;
case Mult: op = " * "; pr = PR_TERM; break;
case MatMult: op = " @ "; pr = PR_TERM; break;
case Div: op = " / "; pr = PR_TERM; break;
case Mod: op = " % "; pr = PR_TERM; break;
case LShift: op = " << "; pr = PR_SHIFT; break;
case RShift: op = " >> "; pr = PR_SHIFT; break;
case BitOr: op = " | "; pr = PR_BOR; break;
case BitXor: op = " ^ "; pr = PR_BXOR; break;
case BitAnd: op = " & "; pr = PR_BAND; break;
case FloorDiv: op = " // "; pr = PR_TERM; break;
case Pow: op = " ** "; pr = PR_POWER; rassoc = true; break;
default:
PyErr_SetString(PyExc_SystemError,
"unknown binary operator");
return -1;
}
APPEND_STR_IF(level > pr, "(");
APPEND_EXPR(e->v.BinOp.left, pr + rassoc);
APPEND_STR(op);
APPEND_EXPR(e->v.BinOp.right, pr + !rassoc);
APPEND_STR_IF(level > pr, ")");
return 0;
}
static int
append_ast_unaryop(_PyUnicodeWriter *writer, expr_ty e, int level)
{
const char *op;
int pr;
switch (e->v.UnaryOp.op) {
case Invert: op = "~"; pr = PR_FACTOR; break;
case Not: op = "not "; pr = PR_NOT; break;
case UAdd: op = "+"; pr = PR_FACTOR; break;
case USub: op = "-"; pr = PR_FACTOR; break;
default:
PyErr_SetString(PyExc_SystemError,
"unknown unary operator");
return -1;
}
APPEND_STR_IF(level > pr, "(");
APPEND_STR(op);
APPEND_EXPR(e->v.UnaryOp.operand, pr);
APPEND_STR_IF(level > pr, ")");
return 0;
}
static int
append_ast_arg(_PyUnicodeWriter *writer, arg_ty arg)
{
if (-1 == _PyUnicodeWriter_WriteStr(writer, arg->arg)) {
return -1;
}
if (arg->annotation) {
APPEND_STR(": ");
APPEND_EXPR(arg->annotation, PR_TEST);
}
return 0;
}
static int
append_ast_args(_PyUnicodeWriter *writer, arguments_ty args)
{
bool first;
Py_ssize_t i, di, arg_count, posonlyarg_count, default_count;
first = true;
/* positional-only and positional arguments with defaults */
posonlyarg_count = asdl_seq_LEN(args->posonlyargs);
arg_count = asdl_seq_LEN(args->args);
default_count = asdl_seq_LEN(args->defaults);
for (i = 0; i < posonlyarg_count + arg_count; i++) {
APPEND_STR_IF_NOT_FIRST(", ");
if (i < posonlyarg_count){
APPEND(arg, (arg_ty)asdl_seq_GET(args->posonlyargs, i));
} else {
APPEND(arg, (arg_ty)asdl_seq_GET(args->args, i-posonlyarg_count));
}
di = i - posonlyarg_count - arg_count + default_count;
if (di >= 0) {
APPEND_STR("=");
APPEND_EXPR((expr_ty)asdl_seq_GET(args->defaults, di), PR_TEST);
}
if (posonlyarg_count && i + 1 == posonlyarg_count) {
APPEND_STR(", /");
}
}
/* vararg, or bare '*' if no varargs but keyword-only arguments present */
if (args->vararg || asdl_seq_LEN(args->kwonlyargs)) {
APPEND_STR_IF_NOT_FIRST(", ");
APPEND_STR("*");
if (args->vararg) {
APPEND(arg, args->vararg);
}
}
/* keyword-only arguments */
arg_count = asdl_seq_LEN(args->kwonlyargs);
default_count = asdl_seq_LEN(args->kw_defaults);
for (i = 0; i < arg_count; i++) {
APPEND_STR_IF_NOT_FIRST(", ");
APPEND(arg, (arg_ty)asdl_seq_GET(args->kwonlyargs, i));
di = i - arg_count + default_count;
if (di >= 0) {
expr_ty default_ = (expr_ty)asdl_seq_GET(args->kw_defaults, di);
if (default_) {
APPEND_STR("=");
APPEND_EXPR(default_, PR_TEST);
}
}
}
/* **kwargs */
if (args->kwarg) {
APPEND_STR_IF_NOT_FIRST(", ");
APPEND_STR("**");
APPEND(arg, args->kwarg);
}
return 0;
}
static int
append_ast_lambda(_PyUnicodeWriter *writer, expr_ty e, int level)
{
APPEND_STR_IF(level > PR_TEST, "(");
Py_ssize_t n_positional = (asdl_seq_LEN(e->v.Lambda.args->args) +
asdl_seq_LEN(e->v.Lambda.args->posonlyargs));
APPEND_STR(n_positional ? "lambda " : "lambda");
APPEND(args, e->v.Lambda.args);
APPEND_STR(": ");
APPEND_EXPR(e->v.Lambda.body, PR_TEST);
APPEND_STR_IF(level > PR_TEST, ")");
return 0;
}
static int
append_ast_ifexp(_PyUnicodeWriter *writer, expr_ty e, int level)
{
APPEND_STR_IF(level > PR_TEST, "(");
APPEND_EXPR(e->v.IfExp.body, PR_TEST + 1);
APPEND_STR(" if ");
APPEND_EXPR(e->v.IfExp.test, PR_TEST + 1);
APPEND_STR(" else ");
APPEND_EXPR(e->v.IfExp.orelse, PR_TEST);
APPEND_STR_IF(level > PR_TEST, ")");
return 0;
}
static int
append_ast_dict(_PyUnicodeWriter *writer, expr_ty e)
{
Py_ssize_t i, value_count;
expr_ty key_node;
APPEND_STR("{");
value_count = asdl_seq_LEN(e->v.Dict.values);
for (i = 0; i < value_count; i++) {
APPEND_STR_IF(i > 0, ", ");
key_node = (expr_ty)asdl_seq_GET(e->v.Dict.keys, i);
if (key_node != NULL) {
APPEND_EXPR(key_node, PR_TEST);
APPEND_STR(": ");
APPEND_EXPR((expr_ty)asdl_seq_GET(e->v.Dict.values, i), PR_TEST);
}
else {
APPEND_STR("**");
APPEND_EXPR((expr_ty)asdl_seq_GET(e->v.Dict.values, i), PR_EXPR);
}
}
APPEND_STR_FINISH("}");
}
static int
append_ast_set(_PyUnicodeWriter *writer, expr_ty e)
{
Py_ssize_t i, elem_count;
APPEND_STR("{");
elem_count = asdl_seq_LEN(e->v.Set.elts);
for (i = 0; i < elem_count; i++) {
APPEND_STR_IF(i > 0, ", ");
APPEND_EXPR((expr_ty)asdl_seq_GET(e->v.Set.elts, i), PR_TEST);
}
APPEND_STR_FINISH("}");
}
static int
append_ast_list(_PyUnicodeWriter *writer, expr_ty e)
{
Py_ssize_t i, elem_count;
APPEND_STR("[");
elem_count = asdl_seq_LEN(e->v.List.elts);
for (i = 0; i < elem_count; i++) {
APPEND_STR_IF(i > 0, ", ");
APPEND_EXPR((expr_ty)asdl_seq_GET(e->v.List.elts, i), PR_TEST);
}
APPEND_STR_FINISH("]");
}
static int
append_ast_tuple(_PyUnicodeWriter *writer, expr_ty e, int level)
{
Py_ssize_t i, elem_count;
elem_count = asdl_seq_LEN(e->v.Tuple.elts);
if (elem_count == 0) {
APPEND_STR_FINISH("()");
}
APPEND_STR_IF(level > PR_TUPLE, "(");
for (i = 0; i < elem_count; i++) {
APPEND_STR_IF(i > 0, ", ");
APPEND_EXPR((expr_ty)asdl_seq_GET(e->v.Tuple.elts, i), PR_TEST);
}
APPEND_STR_IF(elem_count == 1, ",");
APPEND_STR_IF(level > PR_TUPLE, ")");
return 0;
}
static int
append_ast_comprehension(_PyUnicodeWriter *writer, comprehension_ty gen)
{
Py_ssize_t i, if_count;
APPEND_STR(gen->is_async ? " async for " : " for ");
APPEND_EXPR(gen->target, PR_TUPLE);
APPEND_STR(" in ");
APPEND_EXPR(gen->iter, PR_TEST + 1);
if_count = asdl_seq_LEN(gen->ifs);
for (i = 0; i < if_count; i++) {
APPEND_STR(" if ");
APPEND_EXPR((expr_ty)asdl_seq_GET(gen->ifs, i), PR_TEST + 1);
}
return 0;
}
static int
append_ast_comprehensions(_PyUnicodeWriter *writer, asdl_seq *comprehensions)
{
Py_ssize_t i, gen_count;
gen_count = asdl_seq_LEN(comprehensions);
for (i = 0; i < gen_count; i++) {
APPEND(comprehension, (comprehension_ty)asdl_seq_GET(comprehensions, i));
}
return 0;
}
static int
append_ast_genexp(_PyUnicodeWriter *writer, expr_ty e)
{
APPEND_STR("(");
APPEND_EXPR(e->v.GeneratorExp.elt, PR_TEST);
APPEND(comprehensions, e->v.GeneratorExp.generators);
APPEND_STR_FINISH(")");
}
static int
append_ast_listcomp(_PyUnicodeWriter *writer, expr_ty e)
{
APPEND_STR("[");
APPEND_EXPR(e->v.ListComp.elt, PR_TEST);
APPEND(comprehensions, e->v.ListComp.generators);
APPEND_STR_FINISH("]");
}
static int
append_ast_setcomp(_PyUnicodeWriter *writer, expr_ty e)
{
APPEND_STR("{");
APPEND_EXPR(e->v.SetComp.elt, PR_TEST);
APPEND(comprehensions, e->v.SetComp.generators);
APPEND_STR_FINISH("}");
}
static int
append_ast_dictcomp(_PyUnicodeWriter *writer, expr_ty e)
{
APPEND_STR("{");
APPEND_EXPR(e->v.DictComp.key, PR_TEST);
APPEND_STR(": ");
APPEND_EXPR(e->v.DictComp.value, PR_TEST);
APPEND(comprehensions, e->v.DictComp.generators);
APPEND_STR_FINISH("}");
}
static int
append_ast_compare(_PyUnicodeWriter *writer, expr_ty e, int level)
{
const char *op;
Py_ssize_t i, comparator_count;
asdl_seq *comparators;
asdl_int_seq *ops;
APPEND_STR_IF(level > PR_CMP, "(");
comparators = e->v.Compare.comparators;
ops = e->v.Compare.ops;
comparator_count = asdl_seq_LEN(comparators);
assert(comparator_count > 0);
assert(comparator_count == asdl_seq_LEN(ops));
APPEND_EXPR(e->v.Compare.left, PR_CMP + 1);
for (i = 0; i < comparator_count; i++) {
switch ((cmpop_ty)asdl_seq_GET(ops, i)) {
case Eq:
op = " == ";
break;
case NotEq:
op = " != ";
break;
case Lt:
op = " < ";
break;
case LtE:
op = " <= ";
break;
case Gt:
op = " > ";
break;
case GtE:
op = " >= ";
break;
case Is:
op = " is ";
break;
case IsNot:
op = " is not ";
break;
case In:
op = " in ";
break;
case NotIn:
op = " not in ";
break;
default:
PyErr_SetString(PyExc_SystemError,
"unexpected comparison kind");
return -1;
}
APPEND_STR(op);
APPEND_EXPR((expr_ty)asdl_seq_GET(comparators, i), PR_CMP + 1);
}
APPEND_STR_IF(level > PR_CMP, ")");
return 0;
}
static int
append_ast_keyword(_PyUnicodeWriter *writer, keyword_ty kw)
{
if (kw->arg == NULL) {
APPEND_STR("**");
}
else {
if (-1 == _PyUnicodeWriter_WriteStr(writer, kw->arg)) {
return -1;
}
APPEND_STR("=");
}
APPEND_EXPR(kw->value, PR_TEST);
return 0;
}
static int
append_ast_call(_PyUnicodeWriter *writer, expr_ty e)
{
bool first;
Py_ssize_t i, arg_count, kw_count;
expr_ty expr;
APPEND_EXPR(e->v.Call.func, PR_ATOM);
arg_count = asdl_seq_LEN(e->v.Call.args);
kw_count = asdl_seq_LEN(e->v.Call.keywords);
if (arg_count == 1 && kw_count == 0) {
expr = (expr_ty)asdl_seq_GET(e->v.Call.args, 0);
if (expr->kind == GeneratorExp_kind) {
/* Special case: a single generator expression. */
return append_ast_genexp(writer, expr);
}
}
APPEND_STR("(");
first = true;
for (i = 0; i < arg_count; i++) {
APPEND_STR_IF_NOT_FIRST(", ");
APPEND_EXPR((expr_ty)asdl_seq_GET(e->v.Call.args, i), PR_TEST);
}
for (i = 0; i < kw_count; i++) {
APPEND_STR_IF_NOT_FIRST(", ");
APPEND(keyword, (keyword_ty)asdl_seq_GET(e->v.Call.keywords, i));
}
APPEND_STR_FINISH(")");
}
static PyObject *
escape_braces(PyObject *orig)
{
PyObject *temp;
PyObject *result;
temp = PyUnicode_Replace(orig, _str_open_br, _str_dbl_open_br, -1);
if (!temp) {
return NULL;
}
result = PyUnicode_Replace(temp, _str_close_br, _str_dbl_close_br, -1);
Py_DECREF(temp);
return result;
}
static int
append_fstring_unicode(_PyUnicodeWriter *writer, PyObject *unicode)
{
PyObject *escaped;
int result = -1;
escaped = escape_braces(unicode);
if (escaped) {
result = _PyUnicodeWriter_WriteStr(writer, escaped);
Py_DECREF(escaped);
}
return result;
}
static int
append_fstring_element(_PyUnicodeWriter *writer, expr_ty e, bool is_format_spec)
{
switch (e->kind) {
case Constant_kind:
return append_fstring_unicode(writer, e->v.Constant.value);
case JoinedStr_kind:
return append_joinedstr(writer, e, is_format_spec);
case FormattedValue_kind:
return append_formattedvalue(writer, e, is_format_spec);
default:
PyErr_SetString(PyExc_SystemError,
"unknown expression kind inside f-string");
return -1;
}
}
/* Build body separately to enable wrapping the entire stream of Strs,
Constants and FormattedValues in one opening and one closing quote. */
static PyObject *
build_fstring_body(asdl_seq *values, bool is_format_spec)
{
Py_ssize_t i, value_count;
_PyUnicodeWriter body_writer;
_PyUnicodeWriter_Init(&body_writer);
body_writer.min_length = 256;
body_writer.overallocate = 1;
value_count = asdl_seq_LEN(values);
for (i = 0; i < value_count; ++i) {
if (-1 == append_fstring_element(&body_writer,
(expr_ty)asdl_seq_GET(values, i),
is_format_spec
)) {
_PyUnicodeWriter_Dealloc(&body_writer);
return NULL;
}
}
return _PyUnicodeWriter_Finish(&body_writer);
}
static int
append_joinedstr(_PyUnicodeWriter *writer, expr_ty e, bool is_format_spec)
{
int result = -1;
PyObject *body = build_fstring_body(e->v.JoinedStr.values, is_format_spec);
if (!body) {
return -1;
}
if (!is_format_spec) {
if (-1 != append_charp(writer, "f") &&
-1 != append_repr(writer, body))
{
result = 0;
}
}
else {
result = _PyUnicodeWriter_WriteStr(writer, body);
}
Py_DECREF(body);
return result;
}
static int
append_formattedvalue(_PyUnicodeWriter *writer, expr_ty e, bool is_format_spec)
{
const char *conversion;
const char *outer_brace = "{";
/* Grammar allows PR_TUPLE, but use >PR_TEST for adding parenthesis
around a lambda with ':' */
PyObject *temp_fv_str = expr_as_unicode(e->v.FormattedValue.value, PR_TEST + 1);
if (!temp_fv_str) {
return -1;
}
if (PyUnicode_Find(temp_fv_str, _str_open_br, 0, 1, 1) == 0) {
/* Expression starts with a brace, split it with a space from the outer
one. */
outer_brace = "{ ";
}
if (-1 == append_charp(writer, outer_brace)) {
Py_DECREF(temp_fv_str);
return -1;
}
if (-1 == _PyUnicodeWriter_WriteStr(writer, temp_fv_str)) {
Py_DECREF(temp_fv_str);
return -1;
}
Py_DECREF(temp_fv_str);
if (e->v.FormattedValue.conversion > 0) {
switch (e->v.FormattedValue.conversion) {
case 'a':
conversion = "!a";
break;
case 'r':
conversion = "!r";
break;
case 's':
conversion = "!s";
break;
default:
PyErr_SetString(PyExc_SystemError,
"unknown f-value conversion kind");
return -1;
}
APPEND_STR(conversion);
}
if (e->v.FormattedValue.format_spec) {
if (-1 == _PyUnicodeWriter_WriteASCIIString(writer, ":", 1) ||
-1 == append_fstring_element(writer,
e->v.FormattedValue.format_spec,
true
))
{
return -1;
}
}
APPEND_STR_FINISH("}");
}
static int
append_ast_attribute(_PyUnicodeWriter *writer, expr_ty e)
{
const char *period;
expr_ty v = e->v.Attribute.value;
APPEND_EXPR(v, PR_ATOM);
/* Special case: integers require a space for attribute access to be
unambiguous. */
if (v->kind == Constant_kind && PyLong_CheckExact(v->v.Constant.value)) {
period = " .";
}
else {
period = ".";
}
APPEND_STR(period);
return _PyUnicodeWriter_WriteStr(writer, e->v.Attribute.attr);
}
static int
append_ast_simple_slice(_PyUnicodeWriter *writer, slice_ty slice)
{
if (slice->v.Slice.lower) {
APPEND_EXPR(slice->v.Slice.lower, PR_TEST);
}
APPEND_STR(":");
if (slice->v.Slice.upper) {
APPEND_EXPR(slice->v.Slice.upper, PR_TEST);
}
if (slice->v.Slice.step) {
APPEND_STR(":");
APPEND_EXPR(slice->v.Slice.step, PR_TEST);
}
return 0;
}
static int
append_ast_ext_slice(_PyUnicodeWriter *writer, slice_ty slice)
{
Py_ssize_t i, dims_count;
dims_count = asdl_seq_LEN(slice->v.ExtSlice.dims);
for (i = 0; i < dims_count; i++) {
APPEND_STR_IF(i > 0, ", ");
APPEND(slice, (slice_ty)asdl_seq_GET(slice->v.ExtSlice.dims, i));
}
return 0;
}
static int
append_ast_slice(_PyUnicodeWriter *writer, slice_ty slice)
{
switch (slice->kind) {
case Slice_kind:
return append_ast_simple_slice(writer, slice);
case ExtSlice_kind:
return append_ast_ext_slice(writer, slice);
case Index_kind:
APPEND_EXPR(slice->v.Index.value, PR_TUPLE);
return 0;
default:
PyErr_SetString(PyExc_SystemError,
"unexpected slice kind");
return -1;
}
}
static int
append_ast_subscript(_PyUnicodeWriter *writer, expr_ty e)
{
APPEND_EXPR(e->v.Subscript.value, PR_ATOM);
APPEND_STR("[");
APPEND(slice, e->v.Subscript.slice);
APPEND_STR_FINISH("]");
}
static int
append_ast_starred(_PyUnicodeWriter *writer, expr_ty e)
{
APPEND_STR("*");
APPEND_EXPR(e->v.Starred.value, PR_EXPR);
return 0;
}
static int
append_ast_yield(_PyUnicodeWriter *writer, expr_ty e)
{
if (!e->v.Yield.value) {
APPEND_STR_FINISH("(yield)");
}
APPEND_STR("(yield ");
APPEND_EXPR(e->v.Yield.value, PR_TEST);
APPEND_STR_FINISH(")");
}
static int
append_ast_yield_from(_PyUnicodeWriter *writer, expr_ty e)
{
APPEND_STR("(yield from ");
APPEND_EXPR(e->v.YieldFrom.value, PR_TEST);
APPEND_STR_FINISH(")");
}
static int
append_ast_await(_PyUnicodeWriter *writer, expr_ty e, int level)
{
APPEND_STR_IF(level > PR_AWAIT, "(");
APPEND_STR("await ");
APPEND_EXPR(e->v.Await.value, PR_ATOM);
APPEND_STR_IF(level > PR_AWAIT, ")");
return 0;
}
static int
append_named_expr(_PyUnicodeWriter *writer, expr_ty e, int level)
{
APPEND_STR_IF(level > PR_TUPLE, "(");
APPEND_EXPR(e->v.NamedExpr.target, PR_ATOM);
APPEND_STR(":=");
APPEND_EXPR(e->v.NamedExpr.value, PR_ATOM);
APPEND_STR_IF(level > PR_TUPLE, ")");
return 0;
}
static int
append_ast_expr(_PyUnicodeWriter *writer, expr_ty e, int level)
{
switch (e->kind) {
case BoolOp_kind:
return append_ast_boolop(writer, e, level);
case BinOp_kind:
return append_ast_binop(writer, e, level);
case UnaryOp_kind:
return append_ast_unaryop(writer, e, level);
case Lambda_kind:
return append_ast_lambda(writer, e, level);
case IfExp_kind:
return append_ast_ifexp(writer, e, level);
case Dict_kind:
return append_ast_dict(writer, e);
case Set_kind:
return append_ast_set(writer, e);
case GeneratorExp_kind:
return append_ast_genexp(writer, e);
case ListComp_kind:
return append_ast_listcomp(writer, e);
case SetComp_kind:
return append_ast_setcomp(writer, e);
case DictComp_kind:
return append_ast_dictcomp(writer, e);
case Yield_kind:
return append_ast_yield(writer, e);
case YieldFrom_kind:
return append_ast_yield_from(writer, e);
case Await_kind:
return append_ast_await(writer, e, level);
case Compare_kind:
return append_ast_compare(writer, e, level);
case Call_kind:
return append_ast_call(writer, e);
case Constant_kind:
if (e->v.Constant.value == Py_Ellipsis) {
APPEND_STR_FINISH("...");
}
return append_repr(writer, e->v.Constant.value);
case JoinedStr_kind:
return append_joinedstr(writer, e, false);
case FormattedValue_kind:
return append_formattedvalue(writer, e, false);
/* The following exprs can be assignment targets. */
case Attribute_kind:
return append_ast_attribute(writer, e);
case Subscript_kind:
return append_ast_subscript(writer, e);
case Starred_kind:
return append_ast_starred(writer, e);
case Name_kind:
return _PyUnicodeWriter_WriteStr(writer, e->v.Name.id);
case List_kind:
return append_ast_list(writer, e);
case Tuple_kind:
return append_ast_tuple(writer, e, level);
case NamedExpr_kind:
return append_named_expr(writer, e, level);
default:
PyErr_SetString(PyExc_SystemError,
"unknown expression kind");
return -1;
}
}
static int
maybe_init_static_strings(void)
{
if (!_str_open_br &&
!(_str_open_br = PyUnicode_InternFromString("{"))) {
return -1;
}
if (!_str_dbl_open_br &&
!(_str_dbl_open_br = PyUnicode_InternFromString("{{"))) {
return -1;
}
if (!_str_close_br &&
!(_str_close_br = PyUnicode_InternFromString("}"))) {
return -1;
}
if (!_str_dbl_close_br &&
!(_str_dbl_close_br = PyUnicode_InternFromString("}}"))) {
return -1;
}
return 0;
}
static PyObject *
expr_as_unicode(expr_ty e, int level)
{
_PyUnicodeWriter writer;
_PyUnicodeWriter_Init(&writer);
writer.min_length = 256;
writer.overallocate = 1;
if (-1 == maybe_init_static_strings() ||
-1 == append_ast_expr(&writer, e, level))
{
_PyUnicodeWriter_Dealloc(&writer);
return NULL;
}
return _PyUnicodeWriter_Finish(&writer);
}
PyObject *
_PyAST_ExprAsUnicode(expr_ty e)
{
return expr_as_unicode(e, PR_TEST);
}