-
Notifications
You must be signed in to change notification settings - Fork 1
/
Copy pathexec_test.go
1821 lines (1685 loc) · 57.3 KB
/
exec_test.go
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 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package template
import (
"bytes"
"errors"
"flag"
"fmt"
"io"
"reflect"
"strings"
"sync"
"testing"
)
var debug = flag.Bool("debug", false, "show the errors produced by the tests")
// T has lots of interesting pieces to use to test execution.
type T struct {
// Basics
True bool
I int
U16 uint16
X, S string
FloatZero float64
ComplexZero complex128
// Nested structs.
U *U
// Struct with String method.
V0 V
V1, V2 *V
// Struct with Error method.
W0 W
W1, W2 *W
// Slices
SI []int
SICap []int
SIEmpty []int
SB []bool
// Arrays
AI [3]int
// Maps
MSI map[string]int
MSIone map[string]int // one element, for deterministic output
MSIEmpty map[string]int
MXI map[any]int
MII map[int]int
MI32S map[int32]string
MI64S map[int64]string
MUI32S map[uint32]string
MUI64S map[uint64]string
MI8S map[int8]string
MUI8S map[uint8]string
SMSI []map[string]int
// Empty interfaces; used to see if we can dig inside one.
Empty0 any // nil
Empty1 any
Empty2 any
Empty3 any
Empty4 any
// Non-empty interfaces.
NonEmptyInterface I
NonEmptyInterfacePtS *I
NonEmptyInterfaceNil I
NonEmptyInterfaceTypedNil I
// Stringer.
Str fmt.Stringer
Err error
// Pointers
PI *int
PS *string
PSI *[]int
NIL *int
// Function (not method)
BinaryFunc func(string, string) string
VariadicFunc func(...string) string
VariadicFuncInt func(int, ...string) string
NilOKFunc func(*int) bool
ErrFunc func() (string, error)
PanicFunc func() string
// Template to test evaluation of templates.
Tmpl *Template
// Unexported field; cannot be accessed by template.
unexported int
}
type S []string
func (S) Method0() string {
return "M0"
}
type U struct {
V string
}
type V struct {
j int
}
func (v *V) String() string {
if v == nil {
return "nilV"
}
return fmt.Sprintf("<%d>", v.j)
}
type W struct {
k int
}
func (w *W) Error() string {
if w == nil {
return "nilW"
}
return fmt.Sprintf("[%d]", w.k)
}
var siVal = I(S{"a", "b"})
var tVal = &T{
True: true,
I: 17,
U16: 16,
X: "x",
S: "xyz",
U: &U{"v"},
V0: V{6666},
V1: &V{7777}, // leave V2 as nil
W0: W{888},
W1: &W{999}, // leave W2 as nil
SI: []int{3, 4, 5},
SICap: make([]int, 5, 10),
AI: [3]int{3, 4, 5},
SB: []bool{true, false},
MSI: map[string]int{"one": 1, "two": 2, "three": 3},
MSIone: map[string]int{"one": 1},
MXI: map[any]int{"one": 1},
MII: map[int]int{1: 1},
MI32S: map[int32]string{1: "one", 2: "two"},
MI64S: map[int64]string{2: "i642", 3: "i643"},
MUI32S: map[uint32]string{2: "u322", 3: "u323"},
MUI64S: map[uint64]string{2: "ui642", 3: "ui643"},
MI8S: map[int8]string{2: "i82", 3: "i83"},
MUI8S: map[uint8]string{2: "u82", 3: "u83"},
SMSI: []map[string]int{
{"one": 1, "two": 2},
{"eleven": 11, "twelve": 12},
},
Empty1: 3,
Empty2: "empty2",
Empty3: []int{7, 8},
Empty4: &U{"UinEmpty"},
NonEmptyInterface: &T{X: "x"},
NonEmptyInterfacePtS: &siVal,
NonEmptyInterfaceTypedNil: (*T)(nil),
Str: bytes.NewBuffer([]byte("foozle")),
Err: errors.New("erroozle"),
PI: newInt(23),
PS: newString("a string"),
PSI: newIntSlice(21, 22, 23),
BinaryFunc: func(a, b string) string { return fmt.Sprintf("[%s=%s]", a, b) },
VariadicFunc: func(s ...string) string { return fmt.Sprint("<", strings.Join(s, "+"), ">") },
VariadicFuncInt: func(a int, s ...string) string { return fmt.Sprint(a, "=<", strings.Join(s, "+"), ">") },
NilOKFunc: func(s *int) bool { return s == nil },
ErrFunc: func() (string, error) { return "bla", nil },
PanicFunc: func() string { panic("test panic") },
Tmpl: Must(New("x").Parse("test template")), // "x" is the value of .X
}
var tSliceOfNil = []*T{nil}
// A non-empty interface.
type I interface {
Method0() string
}
var iVal I = tVal
// Helpers for creation.
func newInt(n int) *int {
return &n
}
func newString(s string) *string {
return &s
}
func newIntSlice(n ...int) *[]int {
p := new([]int)
*p = make([]int, len(n))
copy(*p, n)
return p
}
// Simple methods with and without arguments.
func (t *T) Method0() string {
return "M0"
}
func (t *T) Method1(a int) int {
return a
}
func (t *T) Method2(a uint16, b string) string {
return fmt.Sprintf("Method2: %d %s", a, b)
}
func (t *T) Method3(v any) string {
return fmt.Sprintf("Method3: %v", v)
}
func (t *T) Copy() *T {
n := new(T)
*n = *t
return n
}
func (t *T) MAdd(a int, b []int) []int {
v := make([]int, len(b))
for i, x := range b {
v[i] = x + a
}
return v
}
var myError = errors.New("my error")
// MyError returns a value and an error according to its argument.
func (t *T) MyError(error bool) (bool, error) {
if error {
return true, myError
}
return false, nil
}
// A few methods to test chaining.
func (t *T) GetU() *U {
return t.U
}
func (u *U) TrueFalse(b bool) string {
if b {
return "true"
}
return ""
}
func typeOf(arg any) string {
return fmt.Sprintf("%T", arg)
}
type execTest struct {
name string
input string
output string
data any
ok bool
}
// bigInt and bigUint are hex string representing numbers either side
// of the max int boundary.
// We do it this way so the test doesn't depend on ints being 32 bits.
var (
bigInt = fmt.Sprintf("0x%x", int(1<<uint(reflect.TypeOf(0).Bits()-1)-1))
bigUint = fmt.Sprintf("0x%x", uint(1<<uint(reflect.TypeOf(0).Bits()-1)))
)
var execTests = []execTest{
// Trivial cases.
{"empty", "", "", nil, true},
{"text", "some text", "some text", nil, true},
{"nil action", "{{nil}}", "", nil, false},
// Ideal constants.
{"ideal int", "{{typeOf 3}}", "int", 0, true},
{"ideal float", "{{typeOf 1.0}}", "float64", 0, true},
{"ideal exp float", "{{typeOf 1e1}}", "float64", 0, true},
{"ideal complex", "{{typeOf 1i}}", "complex128", 0, true},
{"ideal int", "{{typeOf " + bigInt + "}}", "int", 0, true},
{"ideal too big", "{{typeOf " + bigUint + "}}", "", 0, false},
{"ideal nil without type", "{{nil}}", "", 0, false},
// Fields of structs.
{".X", "-{{.X}}-", "-x-", tVal, true},
{".U.V", "-{{.U.V}}-", "-v-", tVal, true},
{".unexported", "{{.unexported}}", "", tVal, false},
// Fields on maps.
{"map .one", "{{.MSI.one}}", "1", tVal, true},
{"map .two", "{{.MSI.two}}", "2", tVal, true},
{"map .NO", "{{.MSI.NO}}", "<no value>", tVal, true},
{"map .one interface", "{{.MXI.one}}", "1", tVal, true},
{"map .WRONG args", "{{.MSI.one 1}}", "", tVal, false},
{"map .WRONG type", "{{.MII.one}}", "", tVal, false},
// Dots of all kinds to test basic evaluation.
{"dot int", "<{{.}}>", "<13>", 13, true},
{"dot uint", "<{{.}}>", "<14>", uint(14), true},
{"dot float", "<{{.}}>", "<15.1>", 15.1, true},
{"dot bool", "<{{.}}>", "<true>", true, true},
{"dot complex", "<{{.}}>", "<(16.2-17i)>", 16.2 - 17i, true},
{"dot string", "<{{.}}>", "<hello>", "hello", true},
{"dot slice", "<{{.}}>", "<[-1 -2 -3]>", []int{-1, -2, -3}, true},
{"dot map", "<{{.}}>", "<map[two:22]>", map[string]int{"two": 22}, true},
{"dot struct", "<{{.}}>", "<{7 seven}>", struct {
a int
b string
}{7, "seven"}, true},
// Variables.
{"$ int", "{{$}}", "123", 123, true},
{"$.I", "{{$.I}}", "17", tVal, true},
{"$.U.V", "{{$.U.V}}", "v", tVal, true},
{"declare in action", "{{$x := $.U.V}}{{$x}}", "v", tVal, true},
{"simple assignment", "{{$x := 2}}{{$x = 3}}{{$x}}", "3", tVal, true},
{"nested assignment",
"{{$x := 2}}{{if true}}{{$x = 3}}{{end}}{{$x}}",
"3", tVal, true},
{"nested assignment changes the last declaration",
"{{$x := 1}}{{if true}}{{$x := 2}}{{if true}}{{$x = 3}}{{end}}{{end}}{{$x}}",
"1", tVal, true},
// Type with String method.
{"V{6666}.String()", "-{{.V0}}-", "-<6666>-", tVal, true},
{"&V{7777}.String()", "-{{.V1}}-", "-<7777>-", tVal, true},
{"(*V)(nil).String()", "-{{.V2}}-", "-nilV-", tVal, true},
// Type with Error method.
{"W{888}.Error()", "-{{.W0}}-", "-[888]-", tVal, true},
{"&W{999}.Error()", "-{{.W1}}-", "-[999]-", tVal, true},
{"(*W)(nil).Error()", "-{{.W2}}-", "-nilW-", tVal, true},
// Pointers.
{"*int", "{{.PI}}", "23", tVal, true},
{"*string", "{{.PS}}", "a string", tVal, true},
{"*[]int", "{{.PSI}}", "[21 22 23]", tVal, true},
{"*[]int[1]", "{{index .PSI 1}}", "22", tVal, true},
{"NIL", "{{.NIL}}", "<nil>", tVal, true},
// Empty interfaces holding values.
{"empty nil", "{{.Empty0}}", "<no value>", tVal, true},
{"empty with int", "{{.Empty1}}", "3", tVal, true},
{"empty with string", "{{.Empty2}}", "empty2", tVal, true},
{"empty with slice", "{{.Empty3}}", "[7 8]", tVal, true},
{"empty with struct", "{{.Empty4}}", "{UinEmpty}", tVal, true},
{"empty with struct, field", "{{.Empty4.V}}", "UinEmpty", tVal, true},
// Edge cases with <no value> with an interface value
{"field on interface", "{{.foo}}", "<no value>", nil, true},
{"field on parenthesized interface", "{{(.).foo}}", "<no value>", nil, true},
// Issue 31810: Parenthesized first element of pipeline with arguments.
// See also TestIssue31810.
{"unparenthesized non-function", "{{1 2}}", "", nil, false},
{"parenthesized non-function", "{{(1) 2}}", "", nil, false},
{"parenthesized non-function with no args", "{{(1)}}", "1", nil, true}, // This is fine.
// Method calls.
{".Method0", "-{{.Method0}}-", "-M0-", tVal, true},
{".Method1(1234)", "-{{.Method1 1234}}-", "-1234-", tVal, true},
{".Method1(.I)", "-{{.Method1 .I}}-", "-17-", tVal, true},
{".Method2(3, .X)", "-{{.Method2 3 .X}}-", "-Method2: 3 x-", tVal, true},
{".Method2(.U16, `str`)", "-{{.Method2 .U16 `str`}}-", "-Method2: 16 str-", tVal, true},
{".Method2(.U16, $x)", "{{if $x := .X}}-{{.Method2 .U16 $x}}{{end}}-", "-Method2: 16 x-", tVal, true},
{".Method3(nil constant)", "-{{.Method3 nil}}-", "-Method3: <nil>-", tVal, true},
{".Method3(nil value)", "-{{.Method3 .MXI.unset}}-", "-Method3: <nil>-", tVal, true},
{"method on var", "{{if $x := .}}-{{$x.Method2 .U16 $x.X}}{{end}}-", "-Method2: 16 x-", tVal, true},
{"method on chained var",
"{{range .MSIone}}{{if $.U.TrueFalse $.True}}{{$.U.TrueFalse $.True}}{{else}}WRONG{{end}}{{end}}",
"true", tVal, true},
{"chained method",
"{{range .MSIone}}{{if $.GetU.TrueFalse $.True}}{{$.U.TrueFalse $.True}}{{else}}WRONG{{end}}{{end}}",
"true", tVal, true},
{"chained method on variable",
"{{with $x := .}}{{with .SI}}{{$.GetU.TrueFalse $.True}}{{end}}{{end}}",
"true", tVal, true},
{".NilOKFunc not nil", "{{call .NilOKFunc .PI}}", "false", tVal, true},
{".NilOKFunc nil", "{{call .NilOKFunc nil}}", "true", tVal, true},
{"method on nil value from slice", "-{{range .}}{{.Method1 1234}}{{end}}-", "-1234-", tSliceOfNil, true},
{"method on typed nil interface value", "{{.NonEmptyInterfaceTypedNil.Method0}}", "M0", tVal, true},
// Function call builtin.
{".BinaryFunc", "{{call .BinaryFunc `1` `2`}}", "[1=2]", tVal, true},
{".VariadicFunc0", "{{call .VariadicFunc}}", "<>", tVal, true},
{".VariadicFunc2", "{{call .VariadicFunc `he` `llo`}}", "<he+llo>", tVal, true},
{".VariadicFuncInt", "{{call .VariadicFuncInt 33 `he` `llo`}}", "33=<he+llo>", tVal, true},
{"if .BinaryFunc call", "{{ if .BinaryFunc}}{{call .BinaryFunc `1` `2`}}{{end}}", "[1=2]", tVal, true},
{"if not .BinaryFunc call", "{{ if not .BinaryFunc}}{{call .BinaryFunc `1` `2`}}{{else}}No{{end}}", "No", tVal, true},
{"Interface Call", `{{stringer .S}}`, "foozle", map[string]any{"S": bytes.NewBufferString("foozle")}, true},
{".ErrFunc", "{{call .ErrFunc}}", "bla", tVal, true},
{"call nil", "{{call nil}}", "", tVal, false},
// Erroneous function calls (check args).
{".BinaryFuncTooFew", "{{call .BinaryFunc `1`}}", "", tVal, false},
{".BinaryFuncTooMany", "{{call .BinaryFunc `1` `2` `3`}}", "", tVal, false},
{".BinaryFuncBad0", "{{call .BinaryFunc 1 3}}", "", tVal, false},
{".BinaryFuncBad1", "{{call .BinaryFunc `1` 3}}", "", tVal, false},
{".VariadicFuncBad0", "{{call .VariadicFunc 3}}", "", tVal, false},
{".VariadicFuncIntBad0", "{{call .VariadicFuncInt}}", "", tVal, false},
{".VariadicFuncIntBad`", "{{call .VariadicFuncInt `x`}}", "", tVal, false},
{".VariadicFuncNilBad", "{{call .VariadicFunc nil}}", "", tVal, false},
// Pipelines.
{"pipeline", "-{{.Method0 | .Method2 .U16}}-", "-Method2: 16 M0-", tVal, true},
{"pipeline func", "-{{call .VariadicFunc `llo` | call .VariadicFunc `he` }}-", "-<he+<llo>>-", tVal, true},
// Nil values aren't missing arguments.
{"nil pipeline", "{{ .Empty0 | call .NilOKFunc }}", "true", tVal, true},
{"nil call arg", "{{ call .NilOKFunc .Empty0 }}", "true", tVal, true},
{"bad nil pipeline", "{{ .Empty0 | .VariadicFunc }}", "", tVal, false},
// Parenthesized expressions
{"parens in pipeline", "{{printf `%d %d %d` (1) (2 | add 3) (add 4 (add 5 6))}}", "1 5 15", tVal, true},
// Parenthesized expressions with field accesses
{"parens: $ in paren", "{{($).X}}", "x", tVal, true},
{"parens: $.GetU in paren", "{{($.GetU).V}}", "v", tVal, true},
{"parens: $ in paren in pipe", "{{($ | echo).X}}", "x", tVal, true},
{"parens: spaces and args", `{{(makemap "up" "down" "left" "right").left}}`, "right", tVal, true},
// If.
{"if true", "{{if true}}TRUE{{end}}", "TRUE", tVal, true},
{"if false", "{{if false}}TRUE{{else}}FALSE{{end}}", "FALSE", tVal, true},
{"if nil", "{{if nil}}TRUE{{end}}", "", tVal, false},
{"if on typed nil interface value", "{{if .NonEmptyInterfaceTypedNil}}TRUE{{ end }}", "", tVal, true},
{"if 1", "{{if 1}}NON-ZERO{{else}}ZERO{{end}}", "NON-ZERO", tVal, true},
{"if 0", "{{if 0}}NON-ZERO{{else}}ZERO{{end}}", "ZERO", tVal, true},
{"if 1.5", "{{if 1.5}}NON-ZERO{{else}}ZERO{{end}}", "NON-ZERO", tVal, true},
{"if 0.0", "{{if .FloatZero}}NON-ZERO{{else}}ZERO{{end}}", "ZERO", tVal, true},
{"if 1.5i", "{{if 1.5i}}NON-ZERO{{else}}ZERO{{end}}", "NON-ZERO", tVal, true},
{"if 0.0i", "{{if .ComplexZero}}NON-ZERO{{else}}ZERO{{end}}", "ZERO", tVal, true},
{"if emptystring", "{{if ``}}NON-EMPTY{{else}}EMPTY{{end}}", "EMPTY", tVal, true},
{"if string", "{{if `notempty`}}NON-EMPTY{{else}}EMPTY{{end}}", "NON-EMPTY", tVal, true},
{"if emptyslice", "{{if .SIEmpty}}NON-EMPTY{{else}}EMPTY{{end}}", "EMPTY", tVal, true},
{"if slice", "{{if .SI}}NON-EMPTY{{else}}EMPTY{{end}}", "NON-EMPTY", tVal, true},
{"if emptymap", "{{if .MSIEmpty}}NON-EMPTY{{else}}EMPTY{{end}}", "EMPTY", tVal, true},
{"if map", "{{if .MSI}}NON-EMPTY{{else}}EMPTY{{end}}", "NON-EMPTY", tVal, true},
{"if map unset", "{{if .MXI.none}}NON-ZERO{{else}}ZERO{{end}}", "ZERO", tVal, true},
{"if map not unset", "{{if not .MXI.none}}ZERO{{else}}NON-ZERO{{end}}", "ZERO", tVal, true},
{"if $x with $y int", "{{if $x := true}}{{with $y := .I}}{{$x}},{{$y}}{{end}}{{end}}", "true,17", tVal, true},
{"if $x with $x int", "{{if $x := true}}{{with $x := .I}}{{$x}},{{end}}{{$x}}{{end}}", "17,true", tVal, true},
{"if else if", "{{if false}}FALSE{{else if true}}TRUE{{end}}", "TRUE", tVal, true},
{"if else chain", "{{if eq 1 3}}1{{else if eq 2 3}}2{{else if eq 3 3}}3{{end}}", "3", tVal, true},
// Print etc.
{"print", `{{print "hello, print"}}`, "hello, print", tVal, true},
{"print 123", `{{print 1 2 3}}`, "1 2 3", tVal, true},
{"print nil", `{{print nil}}`, "<nil>", tVal, true},
{"println", `{{println 1 2 3}}`, "1 2 3\n", tVal, true},
{"printf int", `{{printf "%04x" 127}}`, "007f", tVal, true},
{"printf float", `{{printf "%g" 3.5}}`, "3.5", tVal, true},
{"printf complex", `{{printf "%g" 1+7i}}`, "(1+7i)", tVal, true},
{"printf string", `{{printf "%s" "hello"}}`, "hello", tVal, true},
{"printf function", `{{printf "%#q" zeroArgs}}`, "`zeroArgs`", tVal, true},
{"printf field", `{{printf "%s" .U.V}}`, "v", tVal, true},
{"printf method", `{{printf "%s" .Method0}}`, "M0", tVal, true},
{"printf dot", `{{with .I}}{{printf "%d" .}}{{end}}`, "17", tVal, true},
{"printf var", `{{with $x := .I}}{{printf "%d" $x}}{{end}}`, "17", tVal, true},
{"printf lots", `{{printf "%d %s %g %s" 127 "hello" 7-3i .Method0}}`, "127 hello (7-3i) M0", tVal, true},
// HTML.
{"html", `{{html "<script>alert(\"XSS\");</script>"}}`,
"<script>alert("XSS");</script>", nil, true},
{"html pipeline", `{{printf "<script>alert(\"XSS\");</script>" | html}}`,
"<script>alert("XSS");</script>", nil, true},
{"html", `{{html .PS}}`, "a string", tVal, true},
{"html typed nil", `{{html .NIL}}`, "<nil>", tVal, true},
{"html untyped nil", `{{html .Empty0}}`, "<no value>", tVal, true},
// JavaScript.
{"js", `{{js .}}`, `It\'d be nice.`, `It'd be nice.`, true},
// URL query.
{"urlquery", `{{"http://www.example.org/"|urlquery}}`, "http%3A%2F%2Fwww.example.org%2F", nil, true},
// Booleans
{"not", "{{not true}} {{not false}}", "false true", nil, true},
{"and", "{{and false 0}} {{and 1 0}} {{and 0 true}} {{and 1 1}}", "false 0 0 1", nil, true},
{"or", "{{or 0 0}} {{or 1 0}} {{or 0 true}} {{or 1 1}}", "0 1 true 1", nil, true},
{"or short-circuit", "{{or 0 1 (die)}}", "1", nil, true},
{"and short-circuit", "{{and 1 0 (die)}}", "0", nil, true},
{"or short-circuit2", "{{or 0 0 (die)}}", "", nil, false},
{"and short-circuit2", "{{and 1 1 (die)}}", "", nil, false},
{"and pipe-true", "{{1 | and 1}}", "1", nil, true},
{"and pipe-false", "{{0 | and 1}}", "0", nil, true},
{"or pipe-true", "{{1 | or 0}}", "1", nil, true},
{"or pipe-false", "{{0 | or 0}}", "0", nil, true},
{"and undef", "{{and 1 .Unknown}}", "<no value>", nil, true},
{"or undef", "{{or 0 .Unknown}}", "<no value>", nil, true},
{"boolean if", "{{if and true 1 `hi`}}TRUE{{else}}FALSE{{end}}", "TRUE", tVal, true},
{"boolean if not", "{{if and true 1 `hi` | not}}TRUE{{else}}FALSE{{end}}", "FALSE", nil, true},
{"boolean if pipe", "{{if true | not | and 1}}TRUE{{else}}FALSE{{end}}", "FALSE", nil, true},
// Indexing.
{"slice[0]", "{{index .SI 0}}", "3", tVal, true},
{"slice[1]", "{{index .SI 1}}", "4", tVal, true},
{"slice[HUGE]", "{{index .SI 10}}", "", tVal, false},
{"slice[WRONG]", "{{index .SI `hello`}}", "", tVal, false},
{"slice[nil]", "{{index .SI nil}}", "", tVal, false},
{"map[one]", "{{index .MSI `one`}}", "1", tVal, true},
{"map[two]", "{{index .MSI `two`}}", "2", tVal, true},
{"map[NO]", "{{index .MSI `XXX`}}", "0", tVal, true},
{"map[nil]", "{{index .MSI nil}}", "", tVal, false},
{"map[``]", "{{index .MSI ``}}", "0", tVal, true},
{"map[WRONG]", "{{index .MSI 10}}", "", tVal, false},
{"double index", "{{index .SMSI 1 `eleven`}}", "11", tVal, true},
{"nil[1]", "{{index nil 1}}", "", tVal, false},
{"map MI64S", "{{index .MI64S 2}}", "i642", tVal, true},
{"map MI32S", "{{index .MI32S 2}}", "two", tVal, true},
{"map MUI64S", "{{index .MUI64S 3}}", "ui643", tVal, true},
{"map MI8S", "{{index .MI8S 3}}", "i83", tVal, true},
{"map MUI8S", "{{index .MUI8S 2}}", "u82", tVal, true},
{"index of an interface field", "{{index .Empty3 0}}", "7", tVal, true},
// Slicing.
{"slice[:]", "{{slice .SI}}", "[3 4 5]", tVal, true},
{"slice[1:]", "{{slice .SI 1}}", "[4 5]", tVal, true},
{"slice[1:2]", "{{slice .SI 1 2}}", "[4]", tVal, true},
{"slice[-1:]", "{{slice .SI -1}}", "", tVal, false},
{"slice[1:-2]", "{{slice .SI 1 -2}}", "", tVal, false},
{"slice[1:2:-1]", "{{slice .SI 1 2 -1}}", "", tVal, false},
{"slice[2:1]", "{{slice .SI 2 1}}", "", tVal, false},
{"slice[2:2:1]", "{{slice .SI 2 2 1}}", "", tVal, false},
{"out of range", "{{slice .SI 4 5}}", "", tVal, false},
{"out of range", "{{slice .SI 2 2 5}}", "", tVal, false},
{"len(s) < indexes < cap(s)", "{{slice .SICap 6 10}}", "[0 0 0 0]", tVal, true},
{"len(s) < indexes < cap(s)", "{{slice .SICap 6 10 10}}", "[0 0 0 0]", tVal, true},
{"indexes > cap(s)", "{{slice .SICap 10 11}}", "", tVal, false},
{"indexes > cap(s)", "{{slice .SICap 6 10 11}}", "", tVal, false},
{"array[:]", "{{slice .AI}}", "[3 4 5]", tVal, true},
{"array[1:]", "{{slice .AI 1}}", "[4 5]", tVal, true},
{"array[1:2]", "{{slice .AI 1 2}}", "[4]", tVal, true},
{"string[:]", "{{slice .S}}", "xyz", tVal, true},
{"string[0:1]", "{{slice .S 0 1}}", "x", tVal, true},
{"string[1:]", "{{slice .S 1}}", "yz", tVal, true},
{"string[1:2]", "{{slice .S 1 2}}", "y", tVal, true},
{"out of range", "{{slice .S 1 5}}", "", tVal, false},
{"3-index slice of string", "{{slice .S 1 2 2}}", "", tVal, false},
{"slice of an interface field", "{{slice .Empty3 0 1}}", "[7]", tVal, true},
// Len.
{"slice", "{{len .SI}}", "3", tVal, true},
{"map", "{{len .MSI }}", "3", tVal, true},
{"len of int", "{{len 3}}", "", tVal, false},
{"len of nothing", "{{len .Empty0}}", "", tVal, false},
{"len of an interface field", "{{len .Empty3}}", "2", tVal, true},
// With.
{"with true", "{{with true}}{{.}}{{end}}", "true", tVal, true},
{"with false", "{{with false}}{{.}}{{else}}FALSE{{end}}", "FALSE", tVal, true},
{"with 1", "{{with 1}}{{.}}{{else}}ZERO{{end}}", "1", tVal, true},
{"with 0", "{{with 0}}{{.}}{{else}}ZERO{{end}}", "ZERO", tVal, true},
{"with 1.5", "{{with 1.5}}{{.}}{{else}}ZERO{{end}}", "1.5", tVal, true},
{"with 0.0", "{{with .FloatZero}}{{.}}{{else}}ZERO{{end}}", "ZERO", tVal, true},
{"with 1.5i", "{{with 1.5i}}{{.}}{{else}}ZERO{{end}}", "(0+1.5i)", tVal, true},
{"with 0.0i", "{{with .ComplexZero}}{{.}}{{else}}ZERO{{end}}", "ZERO", tVal, true},
{"with emptystring", "{{with ``}}{{.}}{{else}}EMPTY{{end}}", "EMPTY", tVal, true},
{"with string", "{{with `notempty`}}{{.}}{{else}}EMPTY{{end}}", "notempty", tVal, true},
{"with emptyslice", "{{with .SIEmpty}}{{.}}{{else}}EMPTY{{end}}", "EMPTY", tVal, true},
{"with slice", "{{with .SI}}{{.}}{{else}}EMPTY{{end}}", "[3 4 5]", tVal, true},
{"with emptymap", "{{with .MSIEmpty}}{{.}}{{else}}EMPTY{{end}}", "EMPTY", tVal, true},
{"with map", "{{with .MSIone}}{{.}}{{else}}EMPTY{{end}}", "map[one:1]", tVal, true},
{"with empty interface, struct field", "{{with .Empty4}}{{.V}}{{end}}", "UinEmpty", tVal, true},
{"with $x int", "{{with $x := .I}}{{$x}}{{end}}", "17", tVal, true},
{"with $x struct.U.V", "{{with $x := $}}{{$x.U.V}}{{end}}", "v", tVal, true},
{"with variable and action", "{{with $x := $}}{{$y := $.U.V}}{{$y}}{{end}}", "v", tVal, true},
{"with on typed nil interface value", "{{with .NonEmptyInterfaceTypedNil}}TRUE{{ end }}", "", tVal, true},
// Range.
{"range []int", "{{range .SI}}-{{.}}-{{end}}", "-3--4--5-", tVal, true},
{"range empty no else", "{{range .SIEmpty}}-{{.}}-{{end}}", "", tVal, true},
{"range []int else", "{{range .SI}}-{{.}}-{{else}}EMPTY{{end}}", "-3--4--5-", tVal, true},
{"range empty else", "{{range .SIEmpty}}-{{.}}-{{else}}EMPTY{{end}}", "EMPTY", tVal, true},
{"range []int break else", "{{range .SI}}-{{.}}-{{break}}NOTREACHED{{else}}EMPTY{{end}}", "-3-", tVal, true},
{"range []int continue else", "{{range .SI}}-{{.}}-{{continue}}NOTREACHED{{else}}EMPTY{{end}}", "-3--4--5-", tVal, true},
{"range []bool", "{{range .SB}}-{{.}}-{{end}}", "-true--false-", tVal, true},
{"range []int method", "{{range .SI | .MAdd .I}}-{{.}}-{{end}}", "-20--21--22-", tVal, true},
{"range map", "{{range .MSI}}-{{.}}-{{end}}", "-1--3--2-", tVal, true},
{"range empty map no else", "{{range .MSIEmpty}}-{{.}}-{{end}}", "", tVal, true},
{"range map else", "{{range .MSI}}-{{.}}-{{else}}EMPTY{{end}}", "-1--3--2-", tVal, true},
{"range empty map else", "{{range .MSIEmpty}}-{{.}}-{{else}}EMPTY{{end}}", "EMPTY", tVal, true},
{"range empty interface", "{{range .Empty3}}-{{.}}-{{else}}EMPTY{{end}}", "-7--8-", tVal, true},
{"range empty nil", "{{range .Empty0}}-{{.}}-{{end}}", "", tVal, true},
{"range $x SI", "{{range $x := .SI}}<{{$x}}>{{end}}", "<3><4><5>", tVal, true},
{"range $x $y SI", "{{range $x, $y := .SI}}<{{$x}}={{$y}}>{{end}}", "<0=3><1=4><2=5>", tVal, true},
{"range $x MSIone", "{{range $x := .MSIone}}<{{$x}}>{{end}}", "<1>", tVal, true},
{"range $x $y MSIone", "{{range $x, $y := .MSIone}}<{{$x}}={{$y}}>{{end}}", "<one=1>", tVal, true},
{"range $x PSI", "{{range $x := .PSI}}<{{$x}}>{{end}}", "<21><22><23>", tVal, true},
{"declare in range", "{{range $x := .PSI}}<{{$foo:=$x}}{{$x}}>{{end}}", "<21><22><23>", tVal, true},
{"range count", `{{range $i, $x := count 5}}[{{$i}}]{{$x}}{{end}}`, "[0]a[1]b[2]c[3]d[4]e", tVal, true},
{"range nil count", `{{range $i, $x := count 0}}{{else}}empty{{end}}`, "empty", tVal, true},
// Cute examples.
{"or as if true", `{{or .SI "slice is empty"}}`, "[3 4 5]", tVal, true},
{"or as if false", `{{or .SIEmpty "slice is empty"}}`, "slice is empty", tVal, true},
// Error handling.
{"error method, error", "{{.MyError true}}", "", tVal, false},
{"error method, no error", "{{.MyError false}}", "false", tVal, true},
// Numbers
{"decimal", "{{print 1234}}", "1234", tVal, true},
{"decimal _", "{{print 12_34}}", "1234", tVal, true},
{"binary", "{{print 0b101}}", "5", tVal, true},
{"binary _", "{{print 0b_1_0_1}}", "5", tVal, true},
{"BINARY", "{{print 0B101}}", "5", tVal, true},
{"octal0", "{{print 0377}}", "255", tVal, true},
{"octal", "{{print 0o377}}", "255", tVal, true},
{"octal _", "{{print 0o_3_7_7}}", "255", tVal, true},
{"OCTAL", "{{print 0O377}}", "255", tVal, true},
{"hex", "{{print 0x123}}", "291", tVal, true},
{"hex _", "{{print 0x1_23}}", "291", tVal, true},
{"HEX", "{{print 0X123ABC}}", "1194684", tVal, true},
{"float", "{{print 123.4}}", "123.4", tVal, true},
{"float _", "{{print 0_0_1_2_3.4}}", "123.4", tVal, true},
{"hex float", "{{print +0x1.ep+2}}", "7.5", tVal, true},
{"hex float _", "{{print +0x_1.e_0p+0_2}}", "7.5", tVal, true},
{"HEX float", "{{print +0X1.EP+2}}", "7.5", tVal, true},
{"print multi", "{{print 1_2_3_4 7.5_00_00_00}}", "1234 7.5", tVal, true},
{"print multi2", "{{print 1234 0x0_1.e_0p+02}}", "1234 7.5", tVal, true},
// Fixed bugs.
// Must separate dot and receiver; otherwise args are evaluated with dot set to variable.
{"bug0", "{{range .MSIone}}{{if $.Method1 .}}X{{end}}{{end}}", "X", tVal, true},
// Do not loop endlessly in indirect for non-empty interfaces.
// The bug appears with *interface only; looped forever.
{"bug1", "{{.Method0}}", "M0", &iVal, true},
// Was taking address of interface field, so method set was empty.
{"bug2", "{{$.NonEmptyInterface.Method0}}", "M0", tVal, true},
// Struct values were not legal in with - mere oversight.
{"bug3", "{{with $}}{{.Method0}}{{end}}", "M0", tVal, true},
// Nil interface values in if.
{"bug4", "{{if .Empty0}}non-nil{{else}}nil{{end}}", "nil", tVal, true},
// Stringer.
{"bug5", "{{.Str}}", "foozle", tVal, true},
{"bug5a", "{{.Err}}", "erroozle", tVal, true},
// Args need to be indirected and dereferenced sometimes.
{"bug6a", "{{vfunc .V0 .V1}}", "vfunc", tVal, true},
{"bug6b", "{{vfunc .V0 .V0}}", "vfunc", tVal, true},
{"bug6c", "{{vfunc .V1 .V0}}", "vfunc", tVal, true},
{"bug6d", "{{vfunc .V1 .V1}}", "vfunc", tVal, true},
// Legal parse but illegal execution: non-function should have no arguments.
{"bug7a", "{{3 2}}", "", tVal, false},
{"bug7b", "{{$x := 1}}{{$x 2}}", "", tVal, false},
{"bug7c", "{{$x := 1}}{{3 | $x}}", "", tVal, false},
// Pipelined arg was not being type-checked.
{"bug8a", "{{3|oneArg}}", "", tVal, false},
{"bug8b", "{{4|dddArg 3}}", "", tVal, false},
// A bug was introduced that broke map lookups for lower-case names.
{"bug9", "{{.cause}}", "neglect", map[string]string{"cause": "neglect"}, true},
// Field chain starting with function did not work.
{"bug10", "{{mapOfThree.three}}-{{(mapOfThree).three}}", "3-3", 0, true},
// Dereferencing nil pointer while evaluating function arguments should not panic. Issue 7333.
{"bug11", "{{valueString .PS}}", "", T{}, false},
// 0xef gave constant type float64. Issue 8622.
{"bug12xe", "{{printf `%T` 0xef}}", "int", T{}, true},
{"bug12xE", "{{printf `%T` 0xEE}}", "int", T{}, true},
{"bug12Xe", "{{printf `%T` 0Xef}}", "int", T{}, true},
{"bug12XE", "{{printf `%T` 0XEE}}", "int", T{}, true},
// Chained nodes did not work as arguments. Issue 8473.
{"bug13", "{{print (.Copy).I}}", "17", tVal, true},
// Didn't protect against nil or literal values in field chains.
{"bug14a", "{{(nil).True}}", "", tVal, false},
{"bug14b", "{{$x := nil}}{{$x.anything}}", "", tVal, false},
{"bug14c", `{{$x := (1.0)}}{{$y := ("hello")}}{{$x.anything}}{{$y.true}}`, "", tVal, false},
// Didn't call validateType on function results. Issue 10800.
{"bug15", "{{valueString returnInt}}", "", tVal, false},
// Variadic function corner cases. Issue 10946.
{"bug16a", "{{true|printf}}", "", tVal, false},
{"bug16b", "{{1|printf}}", "", tVal, false},
{"bug16c", "{{1.1|printf}}", "", tVal, false},
{"bug16d", "{{'x'|printf}}", "", tVal, false},
{"bug16e", "{{0i|printf}}", "", tVal, false},
{"bug16f", "{{true|twoArgs \"xxx\"}}", "", tVal, false},
{"bug16g", "{{\"aaa\" |twoArgs \"bbb\"}}", "twoArgs=bbbaaa", tVal, true},
{"bug16h", "{{1|oneArg}}", "", tVal, false},
{"bug16i", "{{\"aaa\"|oneArg}}", "oneArg=aaa", tVal, true},
{"bug16j", "{{1+2i|printf \"%v\"}}", "(1+2i)", tVal, true},
{"bug16k", "{{\"aaa\"|printf }}", "aaa", tVal, true},
{"bug17a", "{{.NonEmptyInterface.X}}", "x", tVal, true},
{"bug17b", "-{{.NonEmptyInterface.Method1 1234}}-", "-1234-", tVal, true},
{"bug17c", "{{len .NonEmptyInterfacePtS}}", "2", tVal, true},
{"bug17d", "{{index .NonEmptyInterfacePtS 0}}", "a", tVal, true},
{"bug17e", "{{range .NonEmptyInterfacePtS}}-{{.}}-{{end}}", "-a--b-", tVal, true},
// More variadic function corner cases. Some runes would get evaluated
// as constant floats instead of ints. Issue 34483.
{"bug18a", "{{eq . '.'}}", "true", '.', true},
{"bug18b", "{{eq . 'e'}}", "true", 'e', true},
{"bug18c", "{{eq . 'P'}}", "true", 'P', true},
{"issue56490", "{{$i := 0}}{{$x := 0}}{{range $i = .AI}}{{end}}{{$i}}", "5", tVal, true},
{"issue60801", "{{$k := 0}}{{$v := 0}}{{range $k, $v = .AI}}{{$k}}={{$v}} {{end}}", "0=3 1=4 2=5 ", tVal, true},
}
func zeroArgs() string {
return "zeroArgs"
}
func oneArg(a string) string {
return "oneArg=" + a
}
func twoArgs(a, b string) string {
return "twoArgs=" + a + b
}
func dddArg(a int, b ...string) string {
return fmt.Sprintln(a, b)
}
// count returns a channel that will deliver n sequential 1-letter strings starting at "a"
func count(n int) chan string {
if n == 0 {
return nil
}
c := make(chan string)
go func() {
for i := 0; i < n; i++ {
c <- "abcdefghijklmnop"[i : i+1]
}
close(c)
}()
return c
}
// vfunc takes a *V and a V
func vfunc(V, *V) string {
return "vfunc"
}
// valueString takes a string, not a pointer.
func valueString(v string) string {
return "value is ignored"
}
// returnInt returns an int
func returnInt() int {
return 7
}
func add(args ...int) int {
sum := 0
for _, x := range args {
sum += x
}
return sum
}
func echo(arg any) any {
return arg
}
func makemap(arg ...string) map[string]string {
if len(arg)%2 != 0 {
panic("bad makemap")
}
m := make(map[string]string)
for i := 0; i < len(arg); i += 2 {
m[arg[i]] = arg[i+1]
}
return m
}
func stringer(s fmt.Stringer) string {
return s.String()
}
func mapOfThree() any {
return map[string]int{"three": 3}
}
func testExecute(execTests []execTest, template *Template, t *testing.T) {
b := new(strings.Builder)
funcs := FuncMap{
"add": add,
"count": count,
"dddArg": dddArg,
"die": func() bool { panic("die") },
"echo": echo,
"makemap": makemap,
"mapOfThree": mapOfThree,
"oneArg": oneArg,
"returnInt": returnInt,
"stringer": stringer,
"twoArgs": twoArgs,
"typeOf": typeOf,
"valueString": valueString,
"vfunc": vfunc,
"zeroArgs": zeroArgs,
}
for _, test := range execTests {
var tmpl *Template
var err error
if template == nil {
tmpl, err = New(test.name).Funcs(funcs).Parse(test.input)
} else {
tmpl, err = template.New(test.name).Funcs(funcs).Parse(test.input)
}
if err != nil {
t.Errorf("%s: parse error: %s", test.name, err)
continue
}
b.Reset()
err = tmpl.Execute(b, test.data)
switch {
case !test.ok && err == nil:
t.Errorf("%s: expected error; got none", test.name)
continue
case test.ok && err != nil:
t.Errorf("%s: unexpected execute error: %s", test.name, err)
continue
case !test.ok && err != nil:
// expected error, got one
if *debug {
fmt.Printf("%s: %s\n\t%s\n", test.name, test.input, err)
}
}
result := b.String()
if result != test.output {
t.Errorf("%s: expected\n\t%q\ngot\n\t%q", test.name, test.output, result)
}
}
}
func TestExecute(t *testing.T) {
testExecute(execTests, nil, t)
}
var delimPairs = []string{
"", "", // default
"{{", "}}", // same as default
"<<", ">>", // distinct
"|", "|", // same
"(日)", "(本)", // peculiar
}
func TestDelims(t *testing.T) {
const hello = "Hello, world"
var value = struct{ Str string }{hello}
for i := 0; i < len(delimPairs); i += 2 {
text := ".Str"
left := delimPairs[i+0]
trueLeft := left
right := delimPairs[i+1]
trueRight := right
if left == "" { // default case
trueLeft = "{{"
}
if right == "" { // default case
trueRight = "}}"
}
text = trueLeft + text + trueRight
// Now add a comment
text += trueLeft + "/*comment*/" + trueRight
// Now add an action containing a string.
text += trueLeft + `"` + trueLeft + `"` + trueRight
// At this point text looks like `{{.Str}}{{/*comment*/}}{{"{{"}}`.
tmpl, err := New("delims").Delims(left, right).Parse(text)
if err != nil {
t.Fatalf("delim %q text %q parse err %s", left, text, err)
}
var b = new(strings.Builder)
err = tmpl.Execute(b, value)
if err != nil {
t.Fatalf("delim %q exec err %s", left, err)
}
if b.String() != hello+trueLeft {
t.Errorf("expected %q got %q", hello+trueLeft, b.String())
}
}
}
// Check that an error from a method flows back to the top.
func TestExecuteError(t *testing.T) {
b := new(bytes.Buffer)
tmpl := New("error")
_, err := tmpl.Parse("{{.MyError true}}")
if err != nil {
t.Fatalf("parse error: %s", err)
}
err = tmpl.Execute(b, tVal)
if err == nil {
t.Errorf("expected error; got none")
} else if !strings.Contains(err.Error(), myError.Error()) {
if *debug {
fmt.Printf("test execute error: %s\n", err)
}
t.Errorf("expected myError; got %s", err)
}
}
const execErrorText = `line 1
line 2
line 3
{{template "one" .}}
{{define "one"}}{{template "two" .}}{{end}}
{{define "two"}}{{template "three" .}}{{end}}
{{define "three"}}{{index "hi" $}}{{end}}`
// Check that an error from a nested template contains all the relevant information.
func TestExecError(t *testing.T) {
tmpl, err := New("top").Parse(execErrorText)
if err != nil {
t.Fatal("parse error:", err)
}
var b bytes.Buffer
err = tmpl.Execute(&b, 5) // 5 is out of range indexing "hi"
if err == nil {
t.Fatal("expected error")
}
const want = `template: top:7:20: executing "three" at <index "hi" $>: error calling index: index out of range: 5`
got := err.Error()
if got != want {
t.Errorf("expected\n%q\ngot\n%q", want, got)
}
}
type CustomError struct{}
func (*CustomError) Error() string { return "heyo !" }
// Check that a custom error can be returned.
func TestExecError_CustomError(t *testing.T) {
failingFunc := func() (string, error) {
return "", &CustomError{}
}
tmpl := Must(New("top").Funcs(FuncMap{
"err": failingFunc,
}).Parse("{{ err }}"))
var b bytes.Buffer
err := tmpl.Execute(&b, nil)
var e *CustomError
if !errors.As(err, &e) {
t.Fatalf("expected custom error; got %s", err)
}
}
func TestJSEscaping(t *testing.T) {
testCases := []struct {
in, exp string
}{
{`a`, `a`},
{`'foo`, `\'foo`},
{`Go "jump" \`, `Go \"jump\" \\`},
{`Yukihiro says "今日は世界"`, `Yukihiro says \"今日は世界\"`},
{"unprintable \uFFFE", `unprintable \uFFFE`},
{`<html>`, `\u003Chtml\u003E`},
{`no = in attributes`, `no \u003D in attributes`},
{`' does not become HTML entity`, `\u0026#x27; does not become HTML entity`},
}
for _, tc := range testCases {
s := JSEscapeString(tc.in)
if s != tc.exp {
t.Errorf("JS escaping [%s] got [%s] want [%s]", tc.in, s, tc.exp)
}
}
}
// A nice example: walk a binary tree.
type Tree struct {
Val int
Left, Right *Tree
}
// Use different delimiters to test Set.Delims.
// Also test the trimming of leading and trailing spaces.
const treeTemplate = `
(- define "tree" -)
[
(- .Val -)
(- with .Left -)
(template "tree" . -)
(- end -)
(- with .Right -)
(- template "tree" . -)
(- end -)
]
(- end -)
`
func TestTree(t *testing.T) {
var tree = &Tree{
1,
&Tree{
2, &Tree{
3,
&Tree{
4, nil, nil,
},
nil,
},
&Tree{