1
2
3
4
5 package template
6
7 import (
8 "bytes"
9 "errors"
10 "flag"
11 "fmt"
12 "io"
13 "iter"
14 "reflect"
15 "strings"
16 "sync"
17 "testing"
18 )
19
20 var debug = flag.Bool("debug", false, "show the errors produced by the tests")
21
22
23 type T struct {
24
25 True bool
26 I int
27 U16 uint16
28 X, S string
29 FloatZero float64
30 ComplexZero complex128
31
32 U *U
33
34 V0 V
35 V1, V2 *V
36
37 W0 W
38 W1, W2 *W
39
40 SI []int
41 SICap []int
42 SIEmpty []int
43 SB []bool
44
45 AI [3]int
46
47 MSI map[string]int
48 MSIone map[string]int
49 MSIEmpty map[string]int
50 MXI map[any]int
51 MII map[int]int
52 MI32S map[int32]string
53 MI64S map[int64]string
54 MUI32S map[uint32]string
55 MUI64S map[uint64]string
56 MI8S map[int8]string
57 MUI8S map[uint8]string
58 SMSI []map[string]int
59
60 Empty0 any
61 Empty1 any
62 Empty2 any
63 Empty3 any
64 Empty4 any
65
66 NonEmptyInterface I
67 NonEmptyInterfacePtS *I
68 NonEmptyInterfaceNil I
69 NonEmptyInterfaceTypedNil I
70
71 Str fmt.Stringer
72 Err error
73
74 PI *int
75 PS *string
76 PSI *[]int
77 NIL *int
78
79 BinaryFunc func(string, string) string
80 VariadicFunc func(...string) string
81 VariadicFuncInt func(int, ...string) string
82 NilOKFunc func(*int) bool
83 ErrFunc func() (string, error)
84 PanicFunc func() string
85 TooFewReturnCountFunc func()
86 TooManyReturnCountFunc func() (string, error, int)
87 InvalidReturnTypeFunc func() (string, bool)
88
89 Tmpl *Template
90
91 unexported int
92 }
93
94 type S []string
95
96 func (S) Method0() string {
97 return "M0"
98 }
99
100 type U struct {
101 V string
102 }
103
104 type V struct {
105 j int
106 }
107
108 func (v *V) String() string {
109 if v == nil {
110 return "nilV"
111 }
112 return fmt.Sprintf("<%d>", v.j)
113 }
114
115 type W struct {
116 k int
117 }
118
119 func (w *W) Error() string {
120 if w == nil {
121 return "nilW"
122 }
123 return fmt.Sprintf("[%d]", w.k)
124 }
125
126 var siVal = I(S{"a", "b"})
127
128 var tVal = &T{
129 True: true,
130 I: 17,
131 U16: 16,
132 X: "x",
133 S: "xyz",
134 U: &U{"v"},
135 V0: V{6666},
136 V1: &V{7777},
137 W0: W{888},
138 W1: &W{999},
139 SI: []int{3, 4, 5},
140 SICap: make([]int, 5, 10),
141 AI: [3]int{3, 4, 5},
142 SB: []bool{true, false},
143 MSI: map[string]int{"one": 1, "two": 2, "three": 3},
144 MSIone: map[string]int{"one": 1},
145 MXI: map[any]int{"one": 1},
146 MII: map[int]int{1: 1},
147 MI32S: map[int32]string{1: "one", 2: "two"},
148 MI64S: map[int64]string{2: "i642", 3: "i643"},
149 MUI32S: map[uint32]string{2: "u322", 3: "u323"},
150 MUI64S: map[uint64]string{2: "ui642", 3: "ui643"},
151 MI8S: map[int8]string{2: "i82", 3: "i83"},
152 MUI8S: map[uint8]string{2: "u82", 3: "u83"},
153 SMSI: []map[string]int{
154 {"one": 1, "two": 2},
155 {"eleven": 11, "twelve": 12},
156 },
157 Empty1: 3,
158 Empty2: "empty2",
159 Empty3: []int{7, 8},
160 Empty4: &U{"UinEmpty"},
161 NonEmptyInterface: &T{X: "x"},
162 NonEmptyInterfacePtS: &siVal,
163 NonEmptyInterfaceTypedNil: (*T)(nil),
164 Str: bytes.NewBuffer([]byte("foozle")),
165 Err: errors.New("erroozle"),
166 PI: newInt(23),
167 PS: newString("a string"),
168 PSI: newIntSlice(21, 22, 23),
169 BinaryFunc: func(a, b string) string { return fmt.Sprintf("[%s=%s]", a, b) },
170 VariadicFunc: func(s ...string) string { return fmt.Sprint("<", strings.Join(s, "+"), ">") },
171 VariadicFuncInt: func(a int, s ...string) string { return fmt.Sprint(a, "=<", strings.Join(s, "+"), ">") },
172 NilOKFunc: func(s *int) bool { return s == nil },
173 ErrFunc: func() (string, error) { return "bla", nil },
174 PanicFunc: func() string { panic("test panic") },
175 TooFewReturnCountFunc: func() {},
176 TooManyReturnCountFunc: func() (string, error, int) { return "", nil, 0 },
177 InvalidReturnTypeFunc: func() (string, bool) { return "", false },
178 Tmpl: Must(New("x").Parse("test template")),
179 }
180
181 var tSliceOfNil = []*T{nil}
182
183
184 type I interface {
185 Method0() string
186 }
187
188 var iVal I = tVal
189
190
191 func newInt(n int) *int {
192 return &n
193 }
194
195 func newString(s string) *string {
196 return &s
197 }
198
199 func newIntSlice(n ...int) *[]int {
200 p := new([]int)
201 *p = make([]int, len(n))
202 copy(*p, n)
203 return p
204 }
205
206
207 func (t *T) Method0() string {
208 return "M0"
209 }
210
211 func (t *T) Method1(a int) int {
212 return a
213 }
214
215 func (t *T) Method2(a uint16, b string) string {
216 return fmt.Sprintf("Method2: %d %s", a, b)
217 }
218
219 func (t *T) Method3(v any) string {
220 return fmt.Sprintf("Method3: %v", v)
221 }
222
223 func (t *T) Copy() *T {
224 n := new(T)
225 *n = *t
226 return n
227 }
228
229 func (t *T) MAdd(a int, b []int) []int {
230 v := make([]int, len(b))
231 for i, x := range b {
232 v[i] = x + a
233 }
234 return v
235 }
236
237 var myError = errors.New("my error")
238
239
240 func (t *T) MyError(error bool) (bool, error) {
241 if error {
242 return true, myError
243 }
244 return false, nil
245 }
246
247
248 func (t *T) GetU() *U {
249 return t.U
250 }
251
252 func (u *U) TrueFalse(b bool) string {
253 if b {
254 return "true"
255 }
256 return ""
257 }
258
259 func typeOf(arg any) string {
260 return fmt.Sprintf("%T", arg)
261 }
262
263 type execTest struct {
264 name string
265 input string
266 output string
267 data any
268 ok bool
269 }
270
271
272
273
274 var (
275 bigInt = fmt.Sprintf("0x%x", int(1<<uint(reflect.TypeFor[int]().Bits()-1)-1))
276 bigUint = fmt.Sprintf("0x%x", uint(1<<uint(reflect.TypeFor[int]().Bits()-1)))
277 )
278
279 var execTests = []execTest{
280
281 {"empty", "", "", nil, true},
282 {"text", "some text", "some text", nil, true},
283 {"nil action", "{{nil}}", "", nil, false},
284
285
286 {"ideal int", "{{typeOf 3}}", "int", 0, true},
287 {"ideal float", "{{typeOf 1.0}}", "float64", 0, true},
288 {"ideal exp float", "{{typeOf 1e1}}", "float64", 0, true},
289 {"ideal complex", "{{typeOf 1i}}", "complex128", 0, true},
290 {"ideal int", "{{typeOf " + bigInt + "}}", "int", 0, true},
291 {"ideal too big", "{{typeOf " + bigUint + "}}", "", 0, false},
292 {"ideal nil without type", "{{nil}}", "", 0, false},
293
294
295 {".X", "-{{.X}}-", "-x-", tVal, true},
296 {".U.V", "-{{.U.V}}-", "-v-", tVal, true},
297 {".unexported", "{{.unexported}}", "", tVal, false},
298
299
300 {"map .one", "{{.MSI.one}}", "1", tVal, true},
301 {"map .two", "{{.MSI.two}}", "2", tVal, true},
302 {"map .NO", "{{.MSI.NO}}", "<no value>", tVal, true},
303 {"map .one interface", "{{.MXI.one}}", "1", tVal, true},
304 {"map .WRONG args", "{{.MSI.one 1}}", "", tVal, false},
305 {"map .WRONG type", "{{.MII.one}}", "", tVal, false},
306
307
308 {"dot int", "<{{.}}>", "<13>", 13, true},
309 {"dot uint", "<{{.}}>", "<14>", uint(14), true},
310 {"dot float", "<{{.}}>", "<15.1>", 15.1, true},
311 {"dot bool", "<{{.}}>", "<true>", true, true},
312 {"dot complex", "<{{.}}>", "<(16.2-17i)>", 16.2 - 17i, true},
313 {"dot string", "<{{.}}>", "<hello>", "hello", true},
314 {"dot slice", "<{{.}}>", "<[-1 -2 -3]>", []int{-1, -2, -3}, true},
315 {"dot map", "<{{.}}>", "<map[two:22]>", map[string]int{"two": 22}, true},
316 {"dot struct", "<{{.}}>", "<{7 seven}>", struct {
317 a int
318 b string
319 }{7, "seven"}, true},
320
321
322 {"$ int", "{{$}}", "123", 123, true},
323 {"$.I", "{{$.I}}", "17", tVal, true},
324 {"$.U.V", "{{$.U.V}}", "v", tVal, true},
325 {"declare in action", "{{$x := $.U.V}}{{$x}}", "v", tVal, true},
326 {"simple assignment", "{{$x := 2}}{{$x = 3}}{{$x}}", "3", tVal, true},
327 {"nested assignment",
328 "{{$x := 2}}{{if true}}{{$x = 3}}{{end}}{{$x}}",
329 "3", tVal, true},
330 {"nested assignment changes the last declaration",
331 "{{$x := 1}}{{if true}}{{$x := 2}}{{if true}}{{$x = 3}}{{end}}{{end}}{{$x}}",
332 "1", tVal, true},
333
334
335 {"V{6666}.String()", "-{{.V0}}-", "-<6666>-", tVal, true},
336 {"&V{7777}.String()", "-{{.V1}}-", "-<7777>-", tVal, true},
337 {"(*V)(nil).String()", "-{{.V2}}-", "-nilV-", tVal, true},
338
339
340 {"W{888}.Error()", "-{{.W0}}-", "-[888]-", tVal, true},
341 {"&W{999}.Error()", "-{{.W1}}-", "-[999]-", tVal, true},
342 {"(*W)(nil).Error()", "-{{.W2}}-", "-nilW-", tVal, true},
343
344
345 {"*int", "{{.PI}}", "23", tVal, true},
346 {"*string", "{{.PS}}", "a string", tVal, true},
347 {"*[]int", "{{.PSI}}", "[21 22 23]", tVal, true},
348 {"*[]int[1]", "{{index .PSI 1}}", "22", tVal, true},
349 {"NIL", "{{.NIL}}", "<nil>", tVal, true},
350
351
352 {"empty nil", "{{.Empty0}}", "<no value>", tVal, true},
353 {"empty with int", "{{.Empty1}}", "3", tVal, true},
354 {"empty with string", "{{.Empty2}}", "empty2", tVal, true},
355 {"empty with slice", "{{.Empty3}}", "[7 8]", tVal, true},
356 {"empty with struct", "{{.Empty4}}", "{UinEmpty}", tVal, true},
357 {"empty with struct, field", "{{.Empty4.V}}", "UinEmpty", tVal, true},
358
359
360 {"field on interface", "{{.foo}}", "<no value>", nil, true},
361 {"field on parenthesized interface", "{{(.).foo}}", "<no value>", nil, true},
362
363
364
365 {"unparenthesized non-function", "{{1 2}}", "", nil, false},
366 {"parenthesized non-function", "{{(1) 2}}", "", nil, false},
367 {"parenthesized non-function with no args", "{{(1)}}", "1", nil, true},
368
369
370 {".Method0", "-{{.Method0}}-", "-M0-", tVal, true},
371 {".Method1(1234)", "-{{.Method1 1234}}-", "-1234-", tVal, true},
372 {".Method1(.I)", "-{{.Method1 .I}}-", "-17-", tVal, true},
373 {".Method2(3, .X)", "-{{.Method2 3 .X}}-", "-Method2: 3 x-", tVal, true},
374 {".Method2(.U16, `str`)", "-{{.Method2 .U16 `str`}}-", "-Method2: 16 str-", tVal, true},
375 {".Method2(.U16, $x)", "{{if $x := .X}}-{{.Method2 .U16 $x}}{{end}}-", "-Method2: 16 x-", tVal, true},
376 {".Method3(nil constant)", "-{{.Method3 nil}}-", "-Method3: <nil>-", tVal, true},
377 {".Method3(nil value)", "-{{.Method3 .MXI.unset}}-", "-Method3: <nil>-", tVal, true},
378 {"method on var", "{{if $x := .}}-{{$x.Method2 .U16 $x.X}}{{end}}-", "-Method2: 16 x-", tVal, true},
379 {"method on chained var",
380 "{{range .MSIone}}{{if $.U.TrueFalse $.True}}{{$.U.TrueFalse $.True}}{{else}}WRONG{{end}}{{end}}",
381 "true", tVal, true},
382 {"chained method",
383 "{{range .MSIone}}{{if $.GetU.TrueFalse $.True}}{{$.U.TrueFalse $.True}}{{else}}WRONG{{end}}{{end}}",
384 "true", tVal, true},
385 {"chained method on variable",
386 "{{with $x := .}}{{with .SI}}{{$.GetU.TrueFalse $.True}}{{end}}{{end}}",
387 "true", tVal, true},
388 {".NilOKFunc not nil", "{{call .NilOKFunc .PI}}", "false", tVal, true},
389 {".NilOKFunc nil", "{{call .NilOKFunc nil}}", "true", tVal, true},
390 {"method on nil value from slice", "-{{range .}}{{.Method1 1234}}{{end}}-", "-1234-", tSliceOfNil, true},
391 {"method on typed nil interface value", "{{.NonEmptyInterfaceTypedNil.Method0}}", "M0", tVal, true},
392
393
394 {".BinaryFunc", "{{call .BinaryFunc `1` `2`}}", "[1=2]", tVal, true},
395 {".VariadicFunc0", "{{call .VariadicFunc}}", "<>", tVal, true},
396 {".VariadicFunc2", "{{call .VariadicFunc `he` `llo`}}", "<he+llo>", tVal, true},
397 {".VariadicFuncInt", "{{call .VariadicFuncInt 33 `he` `llo`}}", "33=<he+llo>", tVal, true},
398 {"if .BinaryFunc call", "{{ if .BinaryFunc}}{{call .BinaryFunc `1` `2`}}{{end}}", "[1=2]", tVal, true},
399 {"if not .BinaryFunc call", "{{ if not .BinaryFunc}}{{call .BinaryFunc `1` `2`}}{{else}}No{{end}}", "No", tVal, true},
400 {"Interface Call", `{{stringer .S}}`, "foozle", map[string]any{"S": bytes.NewBufferString("foozle")}, true},
401 {".ErrFunc", "{{call .ErrFunc}}", "bla", tVal, true},
402 {"call nil", "{{call nil}}", "", tVal, false},
403
404
405 {".BinaryFuncTooFew", "{{call .BinaryFunc `1`}}", "", tVal, false},
406 {".BinaryFuncTooMany", "{{call .BinaryFunc `1` `2` `3`}}", "", tVal, false},
407 {".BinaryFuncBad0", "{{call .BinaryFunc 1 3}}", "", tVal, false},
408 {".BinaryFuncBad1", "{{call .BinaryFunc `1` 3}}", "", tVal, false},
409 {".VariadicFuncBad0", "{{call .VariadicFunc 3}}", "", tVal, false},
410 {".VariadicFuncIntBad0", "{{call .VariadicFuncInt}}", "", tVal, false},
411 {".VariadicFuncIntBad`", "{{call .VariadicFuncInt `x`}}", "", tVal, false},
412 {".VariadicFuncNilBad", "{{call .VariadicFunc nil}}", "", tVal, false},
413
414
415 {"pipeline", "-{{.Method0 | .Method2 .U16}}-", "-Method2: 16 M0-", tVal, true},
416 {"pipeline func", "-{{call .VariadicFunc `llo` | call .VariadicFunc `he` }}-", "-<he+<llo>>-", tVal, true},
417
418
419 {"nil pipeline", "{{ .Empty0 | call .NilOKFunc }}", "true", tVal, true},
420 {"nil call arg", "{{ call .NilOKFunc .Empty0 }}", "true", tVal, true},
421 {"bad nil pipeline", "{{ .Empty0 | .VariadicFunc }}", "", tVal, false},
422
423
424 {"parens in pipeline", "{{printf `%d %d %d` (1) (2 | add 3) (add 4 (add 5 6))}}", "1 5 15", tVal, true},
425
426
427 {"parens: $ in paren", "{{($).X}}", "x", tVal, true},
428 {"parens: $.GetU in paren", "{{($.GetU).V}}", "v", tVal, true},
429 {"parens: $ in paren in pipe", "{{($ | echo).X}}", "x", tVal, true},
430 {"parens: spaces and args", `{{(makemap "up" "down" "left" "right").left}}`, "right", tVal, true},
431
432
433 {"if true", "{{if true}}TRUE{{end}}", "TRUE", tVal, true},
434 {"if false", "{{if false}}TRUE{{else}}FALSE{{end}}", "FALSE", tVal, true},
435 {"if nil", "{{if nil}}TRUE{{end}}", "", tVal, false},
436 {"if on typed nil interface value", "{{if .NonEmptyInterfaceTypedNil}}TRUE{{ end }}", "", tVal, true},
437 {"if 1", "{{if 1}}NON-ZERO{{else}}ZERO{{end}}", "NON-ZERO", tVal, true},
438 {"if 0", "{{if 0}}NON-ZERO{{else}}ZERO{{end}}", "ZERO", tVal, true},
439 {"if 1.5", "{{if 1.5}}NON-ZERO{{else}}ZERO{{end}}", "NON-ZERO", tVal, true},
440 {"if 0.0", "{{if .FloatZero}}NON-ZERO{{else}}ZERO{{end}}", "ZERO", tVal, true},
441 {"if 1.5i", "{{if 1.5i}}NON-ZERO{{else}}ZERO{{end}}", "NON-ZERO", tVal, true},
442 {"if 0.0i", "{{if .ComplexZero}}NON-ZERO{{else}}ZERO{{end}}", "ZERO", tVal, true},
443 {"if emptystring", "{{if ``}}NON-EMPTY{{else}}EMPTY{{end}}", "EMPTY", tVal, true},
444 {"if string", "{{if `notempty`}}NON-EMPTY{{else}}EMPTY{{end}}", "NON-EMPTY", tVal, true},
445 {"if emptyslice", "{{if .SIEmpty}}NON-EMPTY{{else}}EMPTY{{end}}", "EMPTY", tVal, true},
446 {"if slice", "{{if .SI}}NON-EMPTY{{else}}EMPTY{{end}}", "NON-EMPTY", tVal, true},
447 {"if emptymap", "{{if .MSIEmpty}}NON-EMPTY{{else}}EMPTY{{end}}", "EMPTY", tVal, true},
448 {"if map", "{{if .MSI}}NON-EMPTY{{else}}EMPTY{{end}}", "NON-EMPTY", tVal, true},
449 {"if map unset", "{{if .MXI.none}}NON-ZERO{{else}}ZERO{{end}}", "ZERO", tVal, true},
450 {"if map not unset", "{{if not .MXI.none}}ZERO{{else}}NON-ZERO{{end}}", "ZERO", tVal, true},
451 {"if $x with $y int", "{{if $x := true}}{{with $y := .I}}{{$x}},{{$y}}{{end}}{{end}}", "true,17", tVal, true},
452 {"if $x with $x int", "{{if $x := true}}{{with $x := .I}}{{$x}},{{end}}{{$x}}{{end}}", "17,true", tVal, true},
453 {"if else if", "{{if false}}FALSE{{else if true}}TRUE{{end}}", "TRUE", tVal, true},
454 {"if else chain", "{{if eq 1 3}}1{{else if eq 2 3}}2{{else if eq 3 3}}3{{end}}", "3", tVal, true},
455
456
457 {"print", `{{print "hello, print"}}`, "hello, print", tVal, true},
458 {"print 123", `{{print 1 2 3}}`, "1 2 3", tVal, true},
459 {"print nil", `{{print nil}}`, "<nil>", tVal, true},
460 {"println", `{{println 1 2 3}}`, "1 2 3\n", tVal, true},
461 {"printf int", `{{printf "%04x" 127}}`, "007f", tVal, true},
462 {"printf float", `{{printf "%g" 3.5}}`, "3.5", tVal, true},
463 {"printf complex", `{{printf "%g" 1+7i}}`, "(1+7i)", tVal, true},
464 {"printf string", `{{printf "%s" "hello"}}`, "hello", tVal, true},
465 {"printf function", `{{printf "%#q" zeroArgs}}`, "`zeroArgs`", tVal, true},
466 {"printf field", `{{printf "%s" .U.V}}`, "v", tVal, true},
467 {"printf method", `{{printf "%s" .Method0}}`, "M0", tVal, true},
468 {"printf dot", `{{with .I}}{{printf "%d" .}}{{end}}`, "17", tVal, true},
469 {"printf var", `{{with $x := .I}}{{printf "%d" $x}}{{end}}`, "17", tVal, true},
470 {"printf lots", `{{printf "%d %s %g %s" 127 "hello" 7-3i .Method0}}`, "127 hello (7-3i) M0", tVal, true},
471
472
473 {"html", `{{html "<script>alert(\"XSS\");</script>"}}`,
474 "<script>alert("XSS");</script>", nil, true},
475 {"html pipeline", `{{printf "<script>alert(\"XSS\");</script>" | html}}`,
476 "<script>alert("XSS");</script>", nil, true},
477 {"html", `{{html .PS}}`, "a string", tVal, true},
478 {"html typed nil", `{{html .NIL}}`, "<nil>", tVal, true},
479 {"html untyped nil", `{{html .Empty0}}`, "<no value>", tVal, true},
480
481
482 {"js", `{{js .}}`, `It\'d be nice.`, `It'd be nice.`, true},
483
484
485 {"urlquery", `{{"http://www.example.org/"|urlquery}}`, "http%3A%2F%2Fwww.example.org%2F", nil, true},
486
487
488 {"not", "{{not true}} {{not false}}", "false true", nil, true},
489 {"and", "{{and false 0}} {{and 1 0}} {{and 0 true}} {{and 1 1}}", "false 0 0 1", nil, true},
490 {"or", "{{or 0 0}} {{or 1 0}} {{or 0 true}} {{or 1 1}}", "0 1 true 1", nil, true},
491 {"or short-circuit", "{{or 0 1 (die)}}", "1", nil, true},
492 {"and short-circuit", "{{and 1 0 (die)}}", "0", nil, true},
493 {"or short-circuit2", "{{or 0 0 (die)}}", "", nil, false},
494 {"and short-circuit2", "{{and 1 1 (die)}}", "", nil, false},
495 {"and pipe-true", "{{1 | and 1}}", "1", nil, true},
496 {"and pipe-false", "{{0 | and 1}}", "0", nil, true},
497 {"or pipe-true", "{{1 | or 0}}", "1", nil, true},
498 {"or pipe-false", "{{0 | or 0}}", "0", nil, true},
499 {"and undef", "{{and 1 .Unknown}}", "<no value>", nil, true},
500 {"or undef", "{{or 0 .Unknown}}", "<no value>", nil, true},
501 {"boolean if", "{{if and true 1 `hi`}}TRUE{{else}}FALSE{{end}}", "TRUE", tVal, true},
502 {"boolean if not", "{{if and true 1 `hi` | not}}TRUE{{else}}FALSE{{end}}", "FALSE", nil, true},
503 {"boolean if pipe", "{{if true | not | and 1}}TRUE{{else}}FALSE{{end}}", "FALSE", nil, true},
504
505
506 {"slice[0]", "{{index .SI 0}}", "3", tVal, true},
507 {"slice[1]", "{{index .SI 1}}", "4", tVal, true},
508 {"slice[HUGE]", "{{index .SI 10}}", "", tVal, false},
509 {"slice[WRONG]", "{{index .SI `hello`}}", "", tVal, false},
510 {"slice[nil]", "{{index .SI nil}}", "", tVal, false},
511 {"map[one]", "{{index .MSI `one`}}", "1", tVal, true},
512 {"map[two]", "{{index .MSI `two`}}", "2", tVal, true},
513 {"map[NO]", "{{index .MSI `XXX`}}", "0", tVal, true},
514 {"map[nil]", "{{index .MSI nil}}", "", tVal, false},
515 {"map[``]", "{{index .MSI ``}}", "0", tVal, true},
516 {"map[WRONG]", "{{index .MSI 10}}", "", tVal, false},
517 {"double index", "{{index .SMSI 1 `eleven`}}", "11", tVal, true},
518 {"nil[1]", "{{index nil 1}}", "", tVal, false},
519 {"map MI64S", "{{index .MI64S 2}}", "i642", tVal, true},
520 {"map MI32S", "{{index .MI32S 2}}", "two", tVal, true},
521 {"map MUI64S", "{{index .MUI64S 3}}", "ui643", tVal, true},
522 {"map MI8S", "{{index .MI8S 3}}", "i83", tVal, true},
523 {"map MUI8S", "{{index .MUI8S 2}}", "u82", tVal, true},
524 {"index of an interface field", "{{index .Empty3 0}}", "7", tVal, true},
525
526
527 {"slice[:]", "{{slice .SI}}", "[3 4 5]", tVal, true},
528 {"slice[1:]", "{{slice .SI 1}}", "[4 5]", tVal, true},
529 {"slice[1:2]", "{{slice .SI 1 2}}", "[4]", tVal, true},
530 {"slice[-1:]", "{{slice .SI -1}}", "", tVal, false},
531 {"slice[1:-2]", "{{slice .SI 1 -2}}", "", tVal, false},
532 {"slice[1:2:-1]", "{{slice .SI 1 2 -1}}", "", tVal, false},
533 {"slice[2:1]", "{{slice .SI 2 1}}", "", tVal, false},
534 {"slice[2:2:1]", "{{slice .SI 2 2 1}}", "", tVal, false},
535 {"out of range", "{{slice .SI 4 5}}", "", tVal, false},
536 {"out of range", "{{slice .SI 2 2 5}}", "", tVal, false},
537 {"len(s) < indexes < cap(s)", "{{slice .SICap 6 10}}", "[0 0 0 0]", tVal, true},
538 {"len(s) < indexes < cap(s)", "{{slice .SICap 6 10 10}}", "[0 0 0 0]", tVal, true},
539 {"indexes > cap(s)", "{{slice .SICap 10 11}}", "", tVal, false},
540 {"indexes > cap(s)", "{{slice .SICap 6 10 11}}", "", tVal, false},
541 {"array[:]", "{{slice .AI}}", "[3 4 5]", tVal, true},
542 {"array[1:]", "{{slice .AI 1}}", "[4 5]", tVal, true},
543 {"array[1:2]", "{{slice .AI 1 2}}", "[4]", tVal, true},
544 {"string[:]", "{{slice .S}}", "xyz", tVal, true},
545 {"string[0:1]", "{{slice .S 0 1}}", "x", tVal, true},
546 {"string[1:]", "{{slice .S 1}}", "yz", tVal, true},
547 {"string[1:2]", "{{slice .S 1 2}}", "y", tVal, true},
548 {"out of range", "{{slice .S 1 5}}", "", tVal, false},
549 {"3-index slice of string", "{{slice .S 1 2 2}}", "", tVal, false},
550 {"slice of an interface field", "{{slice .Empty3 0 1}}", "[7]", tVal, true},
551
552
553 {"slice", "{{len .SI}}", "3", tVal, true},
554 {"map", "{{len .MSI }}", "3", tVal, true},
555 {"len of int", "{{len 3}}", "", tVal, false},
556 {"len of nothing", "{{len .Empty0}}", "", tVal, false},
557 {"len of an interface field", "{{len .Empty3}}", "2", tVal, true},
558
559
560 {"with true", "{{with true}}{{.}}{{end}}", "true", tVal, true},
561 {"with false", "{{with false}}{{.}}{{else}}FALSE{{end}}", "FALSE", tVal, true},
562 {"with 1", "{{with 1}}{{.}}{{else}}ZERO{{end}}", "1", tVal, true},
563 {"with 0", "{{with 0}}{{.}}{{else}}ZERO{{end}}", "ZERO", tVal, true},
564 {"with 1.5", "{{with 1.5}}{{.}}{{else}}ZERO{{end}}", "1.5", tVal, true},
565 {"with 0.0", "{{with .FloatZero}}{{.}}{{else}}ZERO{{end}}", "ZERO", tVal, true},
566 {"with 1.5i", "{{with 1.5i}}{{.}}{{else}}ZERO{{end}}", "(0+1.5i)", tVal, true},
567 {"with 0.0i", "{{with .ComplexZero}}{{.}}{{else}}ZERO{{end}}", "ZERO", tVal, true},
568 {"with emptystring", "{{with ``}}{{.}}{{else}}EMPTY{{end}}", "EMPTY", tVal, true},
569 {"with string", "{{with `notempty`}}{{.}}{{else}}EMPTY{{end}}", "notempty", tVal, true},
570 {"with emptyslice", "{{with .SIEmpty}}{{.}}{{else}}EMPTY{{end}}", "EMPTY", tVal, true},
571 {"with slice", "{{with .SI}}{{.}}{{else}}EMPTY{{end}}", "[3 4 5]", tVal, true},
572 {"with emptymap", "{{with .MSIEmpty}}{{.}}{{else}}EMPTY{{end}}", "EMPTY", tVal, true},
573 {"with map", "{{with .MSIone}}{{.}}{{else}}EMPTY{{end}}", "map[one:1]", tVal, true},
574 {"with empty interface, struct field", "{{with .Empty4}}{{.V}}{{end}}", "UinEmpty", tVal, true},
575 {"with $x int", "{{with $x := .I}}{{$x}}{{end}}", "17", tVal, true},
576 {"with $x struct.U.V", "{{with $x := $}}{{$x.U.V}}{{end}}", "v", tVal, true},
577 {"with variable and action", "{{with $x := $}}{{$y := $.U.V}}{{$y}}{{end}}", "v", tVal, true},
578 {"with on typed nil interface value", "{{with .NonEmptyInterfaceTypedNil}}TRUE{{ end }}", "", tVal, true},
579 {"with else with", "{{with 0}}{{.}}{{else with true}}{{.}}{{end}}", "true", tVal, true},
580 {"with else with chain", "{{with 0}}{{.}}{{else with false}}{{.}}{{else with `notempty`}}{{.}}{{end}}", "notempty", tVal, true},
581
582
583 {"range []int", "{{range .SI}}-{{.}}-{{end}}", "-3--4--5-", tVal, true},
584 {"range empty no else", "{{range .SIEmpty}}-{{.}}-{{end}}", "", tVal, true},
585 {"range []int else", "{{range .SI}}-{{.}}-{{else}}EMPTY{{end}}", "-3--4--5-", tVal, true},
586 {"range empty else", "{{range .SIEmpty}}-{{.}}-{{else}}EMPTY{{end}}", "EMPTY", tVal, true},
587 {"range []int break else", "{{range .SI}}-{{.}}-{{break}}NOTREACHED{{else}}EMPTY{{end}}", "-3-", tVal, true},
588 {"range []int continue else", "{{range .SI}}-{{.}}-{{continue}}NOTREACHED{{else}}EMPTY{{end}}", "-3--4--5-", tVal, true},
589 {"range []bool", "{{range .SB}}-{{.}}-{{end}}", "-true--false-", tVal, true},
590 {"range []int method", "{{range .SI | .MAdd .I}}-{{.}}-{{end}}", "-20--21--22-", tVal, true},
591 {"range map", "{{range .MSI}}-{{.}}-{{end}}", "-1--3--2-", tVal, true},
592 {"range empty map no else", "{{range .MSIEmpty}}-{{.}}-{{end}}", "", tVal, true},
593 {"range map else", "{{range .MSI}}-{{.}}-{{else}}EMPTY{{end}}", "-1--3--2-", tVal, true},
594 {"range empty map else", "{{range .MSIEmpty}}-{{.}}-{{else}}EMPTY{{end}}", "EMPTY", tVal, true},
595 {"range empty interface", "{{range .Empty3}}-{{.}}-{{else}}EMPTY{{end}}", "-7--8-", tVal, true},
596 {"range empty nil", "{{range .Empty0}}-{{.}}-{{end}}", "", tVal, true},
597 {"range $x SI", "{{range $x := .SI}}<{{$x}}>{{end}}", "<3><4><5>", tVal, true},
598 {"range $x $y SI", "{{range $x, $y := .SI}}<{{$x}}={{$y}}>{{end}}", "<0=3><1=4><2=5>", tVal, true},
599 {"range $x MSIone", "{{range $x := .MSIone}}<{{$x}}>{{end}}", "<1>", tVal, true},
600 {"range $x $y MSIone", "{{range $x, $y := .MSIone}}<{{$x}}={{$y}}>{{end}}", "<one=1>", tVal, true},
601 {"range $x PSI", "{{range $x := .PSI}}<{{$x}}>{{end}}", "<21><22><23>", tVal, true},
602 {"declare in range", "{{range $x := .PSI}}<{{$foo:=$x}}{{$x}}>{{end}}", "<21><22><23>", tVal, true},
603 {"range count", `{{range $i, $x := count 5}}[{{$i}}]{{$x}}{{end}}`, "[0]a[1]b[2]c[3]d[4]e", tVal, true},
604 {"range nil count", `{{range $i, $x := count 0}}{{else}}empty{{end}}`, "empty", tVal, true},
605 {"range iter.Seq[int]", `{{range $i := .}}{{$i}}{{end}}`, "01", fVal1(2), true},
606 {"i = range iter.Seq[int]", `{{$i := 0}}{{range $i = .}}{{$i}}{{end}}`, "01", fVal1(2), true},
607 {"range iter.Seq[int] over two var", `{{range $i, $c := .}}{{$c}}{{end}}`, "", fVal1(2), false},
608 {"i, c := range iter.Seq2[int,int]", `{{range $i, $c := .}}{{$i}}{{$c}}{{end}}`, "0112", fVal2(2), true},
609 {"i, c = range iter.Seq2[int,int]", `{{$i := 0}}{{$c := 0}}{{range $i, $c = .}}{{$i}}{{$c}}{{end}}`, "0112", fVal2(2), true},
610 {"i = range iter.Seq2[int,int]", `{{$i := 0}}{{range $i = .}}{{$i}}{{end}}`, "01", fVal2(2), true},
611 {"i := range iter.Seq2[int,int]", `{{range $i := .}}{{$i}}{{end}}`, "01", fVal2(2), true},
612 {"i,c,x range iter.Seq2[int,int]", `{{$i := 0}}{{$c := 0}}{{$x := 0}}{{range $i, $c = .}}{{$i}}{{$c}}{{end}}`, "0112", fVal2(2), true},
613 {"i,x range iter.Seq[int]", `{{$i := 0}}{{$x := 0}}{{range $i = .}}{{$i}}{{end}}`, "01", fVal1(2), true},
614 {"range iter.Seq[int] else", `{{range $i := .}}{{$i}}{{else}}empty{{end}}`, "empty", fVal1(0), true},
615 {"range iter.Seq2[int,int] else", `{{range $i := .}}{{$i}}{{else}}empty{{end}}`, "empty", fVal2(0), true},
616 {"range int8", rangeTestInt, rangeTestData[int8](), int8(5), true},
617 {"range int16", rangeTestInt, rangeTestData[int16](), int16(5), true},
618 {"range int32", rangeTestInt, rangeTestData[int32](), int32(5), true},
619 {"range int64", rangeTestInt, rangeTestData[int64](), int64(5), true},
620 {"range int", rangeTestInt, rangeTestData[int](), int(5), true},
621 {"range uint8", rangeTestInt, rangeTestData[uint8](), uint8(5), true},
622 {"range uint16", rangeTestInt, rangeTestData[uint16](), uint16(5), true},
623 {"range uint32", rangeTestInt, rangeTestData[uint32](), uint32(5), true},
624 {"range uint64", rangeTestInt, rangeTestData[uint64](), uint64(5), true},
625 {"range uint", rangeTestInt, rangeTestData[uint](), uint(5), true},
626 {"range uintptr", rangeTestInt, rangeTestData[uintptr](), uintptr(5), true},
627 {"range uintptr(0)", `{{range $v := .}}{{print $v}}{{else}}empty{{end}}`, "empty", uintptr(0), true},
628 {"range 5", `{{range $v := 5}}{{printf "%T%d" $v $v}}{{end}}`, rangeTestData[int](), nil, true},
629
630
631 {"or as if true", `{{or .SI "slice is empty"}}`, "[3 4 5]", tVal, true},
632 {"or as if false", `{{or .SIEmpty "slice is empty"}}`, "slice is empty", tVal, true},
633
634
635 {"error method, error", "{{.MyError true}}", "", tVal, false},
636 {"error method, no error", "{{.MyError false}}", "false", tVal, true},
637
638
639 {"decimal", "{{print 1234}}", "1234", tVal, true},
640 {"decimal _", "{{print 12_34}}", "1234", tVal, true},
641 {"binary", "{{print 0b101}}", "5", tVal, true},
642 {"binary _", "{{print 0b_1_0_1}}", "5", tVal, true},
643 {"BINARY", "{{print 0B101}}", "5", tVal, true},
644 {"octal0", "{{print 0377}}", "255", tVal, true},
645 {"octal", "{{print 0o377}}", "255", tVal, true},
646 {"octal _", "{{print 0o_3_7_7}}", "255", tVal, true},
647 {"OCTAL", "{{print 0O377}}", "255", tVal, true},
648 {"hex", "{{print 0x123}}", "291", tVal, true},
649 {"hex _", "{{print 0x1_23}}", "291", tVal, true},
650 {"HEX", "{{print 0X123ABC}}", "1194684", tVal, true},
651 {"float", "{{print 123.4}}", "123.4", tVal, true},
652 {"float _", "{{print 0_0_1_2_3.4}}", "123.4", tVal, true},
653 {"hex float", "{{print +0x1.ep+2}}", "7.5", tVal, true},
654 {"hex float _", "{{print +0x_1.e_0p+0_2}}", "7.5", tVal, true},
655 {"HEX float", "{{print +0X1.EP+2}}", "7.5", tVal, true},
656 {"print multi", "{{print 1_2_3_4 7.5_00_00_00}}", "1234 7.5", tVal, true},
657 {"print multi2", "{{print 1234 0x0_1.e_0p+02}}", "1234 7.5", tVal, true},
658
659
660
661 {"bug0", "{{range .MSIone}}{{if $.Method1 .}}X{{end}}{{end}}", "X", tVal, true},
662
663
664 {"bug1", "{{.Method0}}", "M0", &iVal, true},
665
666 {"bug2", "{{$.NonEmptyInterface.Method0}}", "M0", tVal, true},
667
668 {"bug3", "{{with $}}{{.Method0}}{{end}}", "M0", tVal, true},
669
670 {"bug4", "{{if .Empty0}}non-nil{{else}}nil{{end}}", "nil", tVal, true},
671
672 {"bug5", "{{.Str}}", "foozle", tVal, true},
673 {"bug5a", "{{.Err}}", "erroozle", tVal, true},
674
675 {"bug6a", "{{vfunc .V0 .V1}}", "vfunc", tVal, true},
676 {"bug6b", "{{vfunc .V0 .V0}}", "vfunc", tVal, true},
677 {"bug6c", "{{vfunc .V1 .V0}}", "vfunc", tVal, true},
678 {"bug6d", "{{vfunc .V1 .V1}}", "vfunc", tVal, true},
679
680 {"bug7a", "{{3 2}}", "", tVal, false},
681 {"bug7b", "{{$x := 1}}{{$x 2}}", "", tVal, false},
682 {"bug7c", "{{$x := 1}}{{3 | $x}}", "", tVal, false},
683
684 {"bug8a", "{{3|oneArg}}", "", tVal, false},
685 {"bug8b", "{{4|dddArg 3}}", "", tVal, false},
686
687 {"bug9", "{{.cause}}", "neglect", map[string]string{"cause": "neglect"}, true},
688
689 {"bug10", "{{mapOfThree.three}}-{{(mapOfThree).three}}", "3-3", 0, true},
690
691 {"bug11", "{{valueString .PS}}", "", T{}, false},
692
693 {"bug12xe", "{{printf `%T` 0xef}}", "int", T{}, true},
694 {"bug12xE", "{{printf `%T` 0xEE}}", "int", T{}, true},
695 {"bug12Xe", "{{printf `%T` 0Xef}}", "int", T{}, true},
696 {"bug12XE", "{{printf `%T` 0XEE}}", "int", T{}, true},
697
698 {"bug13", "{{print (.Copy).I}}", "17", tVal, true},
699
700 {"bug14a", "{{(nil).True}}", "", tVal, false},
701 {"bug14b", "{{$x := nil}}{{$x.anything}}", "", tVal, false},
702 {"bug14c", `{{$x := (1.0)}}{{$y := ("hello")}}{{$x.anything}}{{$y.true}}`, "", tVal, false},
703
704 {"bug15", "{{valueString returnInt}}", "", tVal, false},
705
706 {"bug16a", "{{true|printf}}", "", tVal, false},
707 {"bug16b", "{{1|printf}}", "", tVal, false},
708 {"bug16c", "{{1.1|printf}}", "", tVal, false},
709 {"bug16d", "{{'x'|printf}}", "", tVal, false},
710 {"bug16e", "{{0i|printf}}", "", tVal, false},
711 {"bug16f", "{{true|twoArgs \"xxx\"}}", "", tVal, false},
712 {"bug16g", "{{\"aaa\" |twoArgs \"bbb\"}}", "twoArgs=bbbaaa", tVal, true},
713 {"bug16h", "{{1|oneArg}}", "", tVal, false},
714 {"bug16i", "{{\"aaa\"|oneArg}}", "oneArg=aaa", tVal, true},
715 {"bug16j", "{{1+2i|printf \"%v\"}}", "(1+2i)", tVal, true},
716 {"bug16k", "{{\"aaa\"|printf }}", "aaa", tVal, true},
717 {"bug17a", "{{.NonEmptyInterface.X}}", "x", tVal, true},
718 {"bug17b", "-{{.NonEmptyInterface.Method1 1234}}-", "-1234-", tVal, true},
719 {"bug17c", "{{len .NonEmptyInterfacePtS}}", "2", tVal, true},
720 {"bug17d", "{{index .NonEmptyInterfacePtS 0}}", "a", tVal, true},
721 {"bug17e", "{{range .NonEmptyInterfacePtS}}-{{.}}-{{end}}", "-a--b-", tVal, true},
722
723
724
725 {"bug18a", "{{eq . '.'}}", "true", '.', true},
726 {"bug18b", "{{eq . 'e'}}", "true", 'e', true},
727 {"bug18c", "{{eq . 'P'}}", "true", 'P', true},
728
729 {"issue56490", "{{$i := 0}}{{$x := 0}}{{range $i = .AI}}{{end}}{{$i}}", "5", tVal, true},
730 {"issue60801", "{{$k := 0}}{{$v := 0}}{{range $k, $v = .AI}}{{$k}}={{$v}} {{end}}", "0=3 1=4 2=5 ", tVal, true},
731 }
732
733 func fVal1(i int) iter.Seq[int] {
734 return func(yield func(int) bool) {
735 for v := range i {
736 if !yield(v) {
737 break
738 }
739 }
740 }
741 }
742
743 func fVal2(i int) iter.Seq2[int, int] {
744 return func(yield func(int, int) bool) {
745 for v := range i {
746 if !yield(v, v+1) {
747 break
748 }
749 }
750 }
751 }
752
753 const rangeTestInt = `{{range $v := .}}{{printf "%T%d" $v $v}}{{end}}`
754
755 func rangeTestData[T int | int8 | int16 | int32 | int64 | uint | uint8 | uint16 | uint32 | uint64 | uintptr]() string {
756 I := T(5)
757 var buf strings.Builder
758 for i := T(0); i < I; i++ {
759 fmt.Fprintf(&buf, "%T%d", i, i)
760 }
761 return buf.String()
762 }
763
764 func zeroArgs() string {
765 return "zeroArgs"
766 }
767
768 func oneArg(a string) string {
769 return "oneArg=" + a
770 }
771
772 func twoArgs(a, b string) string {
773 return "twoArgs=" + a + b
774 }
775
776 func dddArg(a int, b ...string) string {
777 return fmt.Sprintln(a, b)
778 }
779
780
781 func count(n int) chan string {
782 if n == 0 {
783 return nil
784 }
785 c := make(chan string)
786 go func() {
787 for i := 0; i < n; i++ {
788 c <- "abcdefghijklmnop"[i : i+1]
789 }
790 close(c)
791 }()
792 return c
793 }
794
795
796 func vfunc(V, *V) string {
797 return "vfunc"
798 }
799
800
801 func valueString(v string) string {
802 return "value is ignored"
803 }
804
805
806 func returnInt() int {
807 return 7
808 }
809
810 func add(args ...int) int {
811 sum := 0
812 for _, x := range args {
813 sum += x
814 }
815 return sum
816 }
817
818 func echo(arg any) any {
819 return arg
820 }
821
822 func makemap(arg ...string) map[string]string {
823 if len(arg)%2 != 0 {
824 panic("bad makemap")
825 }
826 m := make(map[string]string)
827 for i := 0; i < len(arg); i += 2 {
828 m[arg[i]] = arg[i+1]
829 }
830 return m
831 }
832
833 func stringer(s fmt.Stringer) string {
834 return s.String()
835 }
836
837 func mapOfThree() any {
838 return map[string]int{"three": 3}
839 }
840
841 func testExecute(execTests []execTest, template *Template, t *testing.T) {
842 b := new(strings.Builder)
843 funcs := FuncMap{
844 "add": add,
845 "count": count,
846 "dddArg": dddArg,
847 "die": func() bool { panic("die") },
848 "echo": echo,
849 "makemap": makemap,
850 "mapOfThree": mapOfThree,
851 "oneArg": oneArg,
852 "returnInt": returnInt,
853 "stringer": stringer,
854 "twoArgs": twoArgs,
855 "typeOf": typeOf,
856 "valueString": valueString,
857 "vfunc": vfunc,
858 "zeroArgs": zeroArgs,
859 }
860 for _, test := range execTests {
861 var tmpl *Template
862 var err error
863 if template == nil {
864 tmpl, err = New(test.name).Funcs(funcs).Parse(test.input)
865 } else {
866 tmpl, err = template.New(test.name).Funcs(funcs).Parse(test.input)
867 }
868 if err != nil {
869 t.Errorf("%s: parse error: %s", test.name, err)
870 continue
871 }
872 b.Reset()
873 err = tmpl.Execute(b, test.data)
874 switch {
875 case !test.ok && err == nil:
876 t.Errorf("%s: expected error; got none", test.name)
877 continue
878 case test.ok && err != nil:
879 t.Errorf("%s: unexpected execute error: %s", test.name, err)
880 continue
881 case !test.ok && err != nil:
882
883 if *debug {
884 fmt.Printf("%s: %s\n\t%s\n", test.name, test.input, err)
885 }
886 }
887 result := b.String()
888 if result != test.output {
889 t.Errorf("%s: expected\n\t%q\ngot\n\t%q", test.name, test.output, result)
890 }
891 }
892 }
893
894 func TestExecute(t *testing.T) {
895 testExecute(execTests, nil, t)
896 }
897
898 var delimPairs = []string{
899 "", "",
900 "{{", "}}",
901 "<<", ">>",
902 "|", "|",
903 "(日)", "(本)",
904 }
905
906 func TestDelims(t *testing.T) {
907 const hello = "Hello, world"
908 var value = struct{ Str string }{hello}
909 for i := 0; i < len(delimPairs); i += 2 {
910 text := ".Str"
911 left := delimPairs[i+0]
912 trueLeft := left
913 right := delimPairs[i+1]
914 trueRight := right
915 if left == "" {
916 trueLeft = "{{"
917 }
918 if right == "" {
919 trueRight = "}}"
920 }
921 text = trueLeft + text + trueRight
922
923 text += trueLeft + "/*comment*/" + trueRight
924
925 text += trueLeft + `"` + trueLeft + `"` + trueRight
926
927 tmpl, err := New("delims").Delims(left, right).Parse(text)
928 if err != nil {
929 t.Fatalf("delim %q text %q parse err %s", left, text, err)
930 }
931 var b = new(strings.Builder)
932 err = tmpl.Execute(b, value)
933 if err != nil {
934 t.Fatalf("delim %q exec err %s", left, err)
935 }
936 if b.String() != hello+trueLeft {
937 t.Errorf("expected %q got %q", hello+trueLeft, b.String())
938 }
939 }
940 }
941
942
943 func TestExecuteError(t *testing.T) {
944 b := new(bytes.Buffer)
945 tmpl := New("error")
946 _, err := tmpl.Parse("{{.MyError true}}")
947 if err != nil {
948 t.Fatalf("parse error: %s", err)
949 }
950 err = tmpl.Execute(b, tVal)
951 if err == nil {
952 t.Errorf("expected error; got none")
953 } else if !strings.Contains(err.Error(), myError.Error()) {
954 if *debug {
955 fmt.Printf("test execute error: %s\n", err)
956 }
957 t.Errorf("expected myError; got %s", err)
958 }
959 }
960
961 const execErrorText = `line 1
962 line 2
963 line 3
964 {{template "one" .}}
965 {{define "one"}}{{template "two" .}}{{end}}
966 {{define "two"}}{{template "three" .}}{{end}}
967 {{define "three"}}{{index "hi" $}}{{end}}`
968
969
970 func TestExecError(t *testing.T) {
971 tmpl, err := New("top").Parse(execErrorText)
972 if err != nil {
973 t.Fatal("parse error:", err)
974 }
975 var b bytes.Buffer
976 err = tmpl.Execute(&b, 5)
977 if err == nil {
978 t.Fatal("expected error")
979 }
980 const want = `template: top:7:20: executing "three" at <index "hi" $>: error calling index: index out of range: 5`
981 got := err.Error()
982 if got != want {
983 t.Errorf("expected\n%q\ngot\n%q", want, got)
984 }
985 }
986
987 type CustomError struct{}
988
989 func (*CustomError) Error() string { return "heyo !" }
990
991
992 func TestExecError_CustomError(t *testing.T) {
993 failingFunc := func() (string, error) {
994 return "", &CustomError{}
995 }
996 tmpl := Must(New("top").Funcs(FuncMap{
997 "err": failingFunc,
998 }).Parse("{{ err }}"))
999
1000 var b bytes.Buffer
1001 err := tmpl.Execute(&b, nil)
1002
1003 var e *CustomError
1004 if !errors.As(err, &e) {
1005 t.Fatalf("expected custom error; got %s", err)
1006 }
1007 }
1008
1009 func TestJSEscaping(t *testing.T) {
1010 testCases := []struct {
1011 in, exp string
1012 }{
1013 {`a`, `a`},
1014 {`'foo`, `\'foo`},
1015 {`Go "jump" \`, `Go \"jump\" \\`},
1016 {`Yukihiro says "今日は世界"`, `Yukihiro says \"今日は世界\"`},
1017 {"unprintable \uFFFE", `unprintable \uFFFE`},
1018 {`<html>`, `\u003Chtml\u003E`},
1019 {`no = in attributes`, `no \u003D in attributes`},
1020 {`' does not become HTML entity`, `\u0026#x27; does not become HTML entity`},
1021 }
1022 for _, tc := range testCases {
1023 s := JSEscapeString(tc.in)
1024 if s != tc.exp {
1025 t.Errorf("JS escaping [%s] got [%s] want [%s]", tc.in, s, tc.exp)
1026 }
1027 }
1028 }
1029
1030
1031
1032 type Tree struct {
1033 Val int
1034 Left, Right *Tree
1035 }
1036
1037
1038
1039 const treeTemplate = `
1040 (- define "tree" -)
1041 [
1042 (- .Val -)
1043 (- with .Left -)
1044 (template "tree" . -)
1045 (- end -)
1046 (- with .Right -)
1047 (- template "tree" . -)
1048 (- end -)
1049 ]
1050 (- end -)
1051 `
1052
1053 func TestTree(t *testing.T) {
1054 var tree = &Tree{
1055 1,
1056 &Tree{
1057 2, &Tree{
1058 3,
1059 &Tree{
1060 4, nil, nil,
1061 },
1062 nil,
1063 },
1064 &Tree{
1065 5,
1066 &Tree{
1067 6, nil, nil,
1068 },
1069 nil,
1070 },
1071 },
1072 &Tree{
1073 7,
1074 &Tree{
1075 8,
1076 &Tree{
1077 9, nil, nil,
1078 },
1079 nil,
1080 },
1081 &Tree{
1082 10,
1083 &Tree{
1084 11, nil, nil,
1085 },
1086 nil,
1087 },
1088 },
1089 }
1090 tmpl, err := New("root").Delims("(", ")").Parse(treeTemplate)
1091 if err != nil {
1092 t.Fatal("parse error:", err)
1093 }
1094 var b strings.Builder
1095 const expect = "[1[2[3[4]][5[6]]][7[8[9]][10[11]]]]"
1096
1097 err = tmpl.Lookup("tree").Execute(&b, tree)
1098 if err != nil {
1099 t.Fatal("exec error:", err)
1100 }
1101 result := b.String()
1102 if result != expect {
1103 t.Errorf("expected %q got %q", expect, result)
1104 }
1105
1106 b.Reset()
1107 err = tmpl.ExecuteTemplate(&b, "tree", tree)
1108 if err != nil {
1109 t.Fatal("exec error:", err)
1110 }
1111 result = b.String()
1112 if result != expect {
1113 t.Errorf("expected %q got %q", expect, result)
1114 }
1115 }
1116
1117 func TestExecuteOnNewTemplate(t *testing.T) {
1118
1119 New("Name").Templates()
1120
1121 new(Template).Templates()
1122 new(Template).Parse("")
1123 new(Template).New("abc").Parse("")
1124 new(Template).Execute(nil, nil)
1125 new(Template).ExecuteTemplate(nil, "XXX", nil)
1126 }
1127
1128 const testTemplates = `{{define "one"}}one{{end}}{{define "two"}}two{{end}}`
1129
1130 func TestMessageForExecuteEmpty(t *testing.T) {
1131
1132 tmpl := New("empty")
1133 var b bytes.Buffer
1134 err := tmpl.Execute(&b, 0)
1135 if err == nil {
1136 t.Fatal("expected initial error")
1137 }
1138 got := err.Error()
1139 want := `template: empty: "empty" is an incomplete or empty template`
1140 if got != want {
1141 t.Errorf("expected error %s got %s", want, got)
1142 }
1143
1144 tests, err := New("").Parse(testTemplates)
1145 if err != nil {
1146 t.Fatal(err)
1147 }
1148 tmpl.AddParseTree("secondary", tests.Tree)
1149 err = tmpl.Execute(&b, 0)
1150 if err == nil {
1151 t.Fatal("expected second error")
1152 }
1153 got = err.Error()
1154 want = `template: empty: "empty" is an incomplete or empty template`
1155 if got != want {
1156 t.Errorf("expected error %s got %s", want, got)
1157 }
1158
1159 err = tmpl.ExecuteTemplate(&b, "secondary", 0)
1160 if err != nil {
1161 t.Fatal(err)
1162 }
1163 }
1164
1165 func TestFinalForPrintf(t *testing.T) {
1166 tmpl, err := New("").Parse(`{{"x" | printf}}`)
1167 if err != nil {
1168 t.Fatal(err)
1169 }
1170 var b bytes.Buffer
1171 err = tmpl.Execute(&b, 0)
1172 if err != nil {
1173 t.Fatal(err)
1174 }
1175 }
1176
1177 type cmpTest struct {
1178 expr string
1179 truth string
1180 ok bool
1181 }
1182
1183 var cmpTests = []cmpTest{
1184 {"eq true true", "true", true},
1185 {"eq true false", "false", true},
1186 {"eq 1+2i 1+2i", "true", true},
1187 {"eq 1+2i 1+3i", "false", true},
1188 {"eq 1.5 1.5", "true", true},
1189 {"eq 1.5 2.5", "false", true},
1190 {"eq 1 1", "true", true},
1191 {"eq 1 2", "false", true},
1192 {"eq `xy` `xy`", "true", true},
1193 {"eq `xy` `xyz`", "false", true},
1194 {"eq .Uthree .Uthree", "true", true},
1195 {"eq .Uthree .Ufour", "false", true},
1196 {"eq 3 4 5 6 3", "true", true},
1197 {"eq 3 4 5 6 7", "false", true},
1198 {"ne true true", "false", true},
1199 {"ne true false", "true", true},
1200 {"ne 1+2i 1+2i", "false", true},
1201 {"ne 1+2i 1+3i", "true", true},
1202 {"ne 1.5 1.5", "false", true},
1203 {"ne 1.5 2.5", "true", true},
1204 {"ne 1 1", "false", true},
1205 {"ne 1 2", "true", true},
1206 {"ne `xy` `xy`", "false", true},
1207 {"ne `xy` `xyz`", "true", true},
1208 {"ne .Uthree .Uthree", "false", true},
1209 {"ne .Uthree .Ufour", "true", true},
1210 {"lt 1.5 1.5", "false", true},
1211 {"lt 1.5 2.5", "true", true},
1212 {"lt 1 1", "false", true},
1213 {"lt 1 2", "true", true},
1214 {"lt `xy` `xy`", "false", true},
1215 {"lt `xy` `xyz`", "true", true},
1216 {"lt .Uthree .Uthree", "false", true},
1217 {"lt .Uthree .Ufour", "true", true},
1218 {"le 1.5 1.5", "true", true},
1219 {"le 1.5 2.5", "true", true},
1220 {"le 2.5 1.5", "false", true},
1221 {"le 1 1", "true", true},
1222 {"le 1 2", "true", true},
1223 {"le 2 1", "false", true},
1224 {"le `xy` `xy`", "true", true},
1225 {"le `xy` `xyz`", "true", true},
1226 {"le `xyz` `xy`", "false", true},
1227 {"le .Uthree .Uthree", "true", true},
1228 {"le .Uthree .Ufour", "true", true},
1229 {"le .Ufour .Uthree", "false", true},
1230 {"gt 1.5 1.5", "false", true},
1231 {"gt 1.5 2.5", "false", true},
1232 {"gt 1 1", "false", true},
1233 {"gt 2 1", "true", true},
1234 {"gt 1 2", "false", true},
1235 {"gt `xy` `xy`", "false", true},
1236 {"gt `xy` `xyz`", "false", true},
1237 {"gt .Uthree .Uthree", "false", true},
1238 {"gt .Uthree .Ufour", "false", true},
1239 {"gt .Ufour .Uthree", "true", true},
1240 {"ge 1.5 1.5", "true", true},
1241 {"ge 1.5 2.5", "false", true},
1242 {"ge 2.5 1.5", "true", true},
1243 {"ge 1 1", "true", true},
1244 {"ge 1 2", "false", true},
1245 {"ge 2 1", "true", true},
1246 {"ge `xy` `xy`", "true", true},
1247 {"ge `xy` `xyz`", "false", true},
1248 {"ge `xyz` `xy`", "true", true},
1249 {"ge .Uthree .Uthree", "true", true},
1250 {"ge .Uthree .Ufour", "false", true},
1251 {"ge .Ufour .Uthree", "true", true},
1252
1253 {"eq .Uthree .Three", "true", true},
1254 {"eq .Three .Uthree", "true", true},
1255 {"le .Uthree .Three", "true", true},
1256 {"le .Three .Uthree", "true", true},
1257 {"ge .Uthree .Three", "true", true},
1258 {"ge .Three .Uthree", "true", true},
1259 {"lt .Uthree .Three", "false", true},
1260 {"lt .Three .Uthree", "false", true},
1261 {"gt .Uthree .Three", "false", true},
1262 {"gt .Three .Uthree", "false", true},
1263 {"eq .Ufour .Three", "false", true},
1264 {"lt .Ufour .Three", "false", true},
1265 {"gt .Ufour .Three", "true", true},
1266 {"eq .NegOne .Uthree", "false", true},
1267 {"eq .Uthree .NegOne", "false", true},
1268 {"ne .NegOne .Uthree", "true", true},
1269 {"ne .Uthree .NegOne", "true", true},
1270 {"lt .NegOne .Uthree", "true", true},
1271 {"lt .Uthree .NegOne", "false", true},
1272 {"le .NegOne .Uthree", "true", true},
1273 {"le .Uthree .NegOne", "false", true},
1274 {"gt .NegOne .Uthree", "false", true},
1275 {"gt .Uthree .NegOne", "true", true},
1276 {"ge .NegOne .Uthree", "false", true},
1277 {"ge .Uthree .NegOne", "true", true},
1278 {"eq (index `x` 0) 'x'", "true", true},
1279 {"eq (index `x` 0) 'y'", "false", true},
1280 {"eq .V1 .V2", "true", true},
1281 {"eq .Ptr .Ptr", "true", true},
1282 {"eq .Ptr .NilPtr", "false", true},
1283 {"eq .NilPtr .NilPtr", "true", true},
1284 {"eq .Iface1 .Iface1", "true", true},
1285 {"eq .Iface1 .NilIface", "false", true},
1286 {"eq .NilIface .NilIface", "true", true},
1287 {"eq .NilIface .Iface1", "false", true},
1288 {"eq .NilIface 0", "false", true},
1289 {"eq 0 .NilIface", "false", true},
1290 {"eq .Map .Map", "true", true},
1291 {"eq .Map nil", "true", true},
1292 {"eq nil .Map", "true", true},
1293 {"eq .Map .NonNilMap", "false", true},
1294
1295 {"eq `xy` 1", "", false},
1296 {"eq 2 2.0", "", false},
1297 {"lt true true", "", false},
1298 {"lt 1+0i 1+0i", "", false},
1299 {"eq .Ptr 1", "", false},
1300 {"eq .Ptr .NegOne", "", false},
1301 {"eq .Map .V1", "", false},
1302 {"eq .NonNilMap .NonNilMap", "", false},
1303 }
1304
1305 func TestComparison(t *testing.T) {
1306 b := new(strings.Builder)
1307 var cmpStruct = struct {
1308 Uthree, Ufour uint
1309 NegOne, Three int
1310 Ptr, NilPtr *int
1311 NonNilMap map[int]int
1312 Map map[int]int
1313 V1, V2 V
1314 Iface1, NilIface fmt.Stringer
1315 }{
1316 Uthree: 3,
1317 Ufour: 4,
1318 NegOne: -1,
1319 Three: 3,
1320 Ptr: new(int),
1321 NonNilMap: make(map[int]int),
1322 Iface1: b,
1323 }
1324 for _, test := range cmpTests {
1325 text := fmt.Sprintf("{{if %s}}true{{else}}false{{end}}", test.expr)
1326 tmpl, err := New("empty").Parse(text)
1327 if err != nil {
1328 t.Fatalf("%q: %s", test.expr, err)
1329 }
1330 b.Reset()
1331 err = tmpl.Execute(b, &cmpStruct)
1332 if test.ok && err != nil {
1333 t.Errorf("%s errored incorrectly: %s", test.expr, err)
1334 continue
1335 }
1336 if !test.ok && err == nil {
1337 t.Errorf("%s did not error", test.expr)
1338 continue
1339 }
1340 if b.String() != test.truth {
1341 t.Errorf("%s: want %s; got %s", test.expr, test.truth, b.String())
1342 }
1343 }
1344 }
1345
1346 func TestMissingMapKey(t *testing.T) {
1347 data := map[string]int{
1348 "x": 99,
1349 }
1350 tmpl, err := New("t1").Parse("{{.x}} {{.y}}")
1351 if err != nil {
1352 t.Fatal(err)
1353 }
1354 var b strings.Builder
1355
1356 err = tmpl.Execute(&b, data)
1357 if err != nil {
1358 t.Fatal(err)
1359 }
1360 want := "99 <no value>"
1361 got := b.String()
1362 if got != want {
1363 t.Errorf("got %q; expected %q", got, want)
1364 }
1365
1366 tmpl.Option("missingkey=default")
1367 b.Reset()
1368 err = tmpl.Execute(&b, data)
1369 if err != nil {
1370 t.Fatal("default:", err)
1371 }
1372 want = "99 <no value>"
1373 got = b.String()
1374 if got != want {
1375 t.Errorf("got %q; expected %q", got, want)
1376 }
1377
1378 tmpl.Option("missingkey=zero")
1379 b.Reset()
1380 err = tmpl.Execute(&b, data)
1381 if err != nil {
1382 t.Fatal("zero:", err)
1383 }
1384 want = "99 0"
1385 got = b.String()
1386 if got != want {
1387 t.Errorf("got %q; expected %q", got, want)
1388 }
1389
1390 tmpl.Option("missingkey=error")
1391 err = tmpl.Execute(&b, data)
1392 if err == nil {
1393 t.Errorf("expected error; got none")
1394 }
1395
1396 err = tmpl.Execute(&b, nil)
1397 t.Log(err)
1398 if err == nil {
1399 t.Errorf("expected error for nil-interface; got none")
1400 }
1401 }
1402
1403
1404
1405 func TestUnterminatedStringError(t *testing.T) {
1406 _, err := New("X").Parse("hello\n\n{{`unterminated\n\n\n\n}}\n some more\n\n")
1407 if err == nil {
1408 t.Fatal("expected error")
1409 }
1410 str := err.Error()
1411 if !strings.Contains(str, "X:3: unterminated raw quoted string") {
1412 t.Fatalf("unexpected error: %s", str)
1413 }
1414 }
1415
1416 const alwaysErrorText = "always be failing"
1417
1418 var alwaysError = errors.New(alwaysErrorText)
1419
1420 type ErrorWriter int
1421
1422 func (e ErrorWriter) Write(p []byte) (int, error) {
1423 return 0, alwaysError
1424 }
1425
1426 func TestExecuteGivesExecError(t *testing.T) {
1427
1428 tmpl, err := New("X").Parse("hello")
1429 if err != nil {
1430 t.Fatal(err)
1431 }
1432 err = tmpl.Execute(ErrorWriter(0), 0)
1433 if err == nil {
1434 t.Fatal("expected error; got none")
1435 }
1436 if err.Error() != alwaysErrorText {
1437 t.Errorf("expected %q error; got %q", alwaysErrorText, err)
1438 }
1439
1440 tmpl, err = New("X").Parse("hello, {{.X.Y}}")
1441 if err != nil {
1442 t.Fatal(err)
1443 }
1444 err = tmpl.Execute(io.Discard, 0)
1445 if err == nil {
1446 t.Fatal("expected error; got none")
1447 }
1448 eerr, ok := err.(ExecError)
1449 if !ok {
1450 t.Fatalf("did not expect ExecError %s", eerr)
1451 }
1452 expect := "field X in type int"
1453 if !strings.Contains(err.Error(), expect) {
1454 t.Errorf("expected %q; got %q", expect, err)
1455 }
1456 }
1457
1458 func funcNameTestFunc() int {
1459 return 0
1460 }
1461
1462 func TestGoodFuncNames(t *testing.T) {
1463 names := []string{
1464 "_",
1465 "a",
1466 "a1",
1467 "a1",
1468 "Ӵ",
1469 }
1470 for _, name := range names {
1471 tmpl := New("X").Funcs(
1472 FuncMap{
1473 name: funcNameTestFunc,
1474 },
1475 )
1476 if tmpl == nil {
1477 t.Fatalf("nil result for %q", name)
1478 }
1479 }
1480 }
1481
1482 func TestBadFuncNames(t *testing.T) {
1483 names := []string{
1484 "",
1485 "2",
1486 "a-b",
1487 }
1488 for _, name := range names {
1489 testBadFuncName(name, t)
1490 }
1491 }
1492
1493 func testBadFuncName(name string, t *testing.T) {
1494 t.Helper()
1495 defer func() {
1496 recover()
1497 }()
1498 New("X").Funcs(
1499 FuncMap{
1500 name: funcNameTestFunc,
1501 },
1502 )
1503
1504
1505 t.Errorf("%q succeeded incorrectly as function name", name)
1506 }
1507
1508 func TestBlock(t *testing.T) {
1509 const (
1510 input = `a({{block "inner" .}}bar({{.}})baz{{end}})b`
1511 want = `a(bar(hello)baz)b`
1512 overlay = `{{define "inner"}}foo({{.}})bar{{end}}`
1513 want2 = `a(foo(goodbye)bar)b`
1514 )
1515 tmpl, err := New("outer").Parse(input)
1516 if err != nil {
1517 t.Fatal(err)
1518 }
1519 tmpl2, err := Must(tmpl.Clone()).Parse(overlay)
1520 if err != nil {
1521 t.Fatal(err)
1522 }
1523
1524 var buf strings.Builder
1525 if err := tmpl.Execute(&buf, "hello"); err != nil {
1526 t.Fatal(err)
1527 }
1528 if got := buf.String(); got != want {
1529 t.Errorf("got %q, want %q", got, want)
1530 }
1531
1532 buf.Reset()
1533 if err := tmpl2.Execute(&buf, "goodbye"); err != nil {
1534 t.Fatal(err)
1535 }
1536 if got := buf.String(); got != want2 {
1537 t.Errorf("got %q, want %q", got, want2)
1538 }
1539 }
1540
1541 func TestEvalFieldErrors(t *testing.T) {
1542 tests := []struct {
1543 name, src string
1544 value any
1545 want string
1546 }{
1547 {
1548
1549
1550
1551 "MissingFieldOnNil",
1552 "{{.MissingField}}",
1553 (*T)(nil),
1554 "can't evaluate field MissingField in type *template.T",
1555 },
1556 {
1557 "MissingFieldOnNonNil",
1558 "{{.MissingField}}",
1559 &T{},
1560 "can't evaluate field MissingField in type *template.T",
1561 },
1562 {
1563 "ExistingFieldOnNil",
1564 "{{.X}}",
1565 (*T)(nil),
1566 "nil pointer evaluating *template.T.X",
1567 },
1568 {
1569 "MissingKeyOnNilMap",
1570 "{{.MissingKey}}",
1571 (*map[string]string)(nil),
1572 "nil pointer evaluating *map[string]string.MissingKey",
1573 },
1574 {
1575 "MissingKeyOnNilMapPtr",
1576 "{{.MissingKey}}",
1577 (*map[string]string)(nil),
1578 "nil pointer evaluating *map[string]string.MissingKey",
1579 },
1580 {
1581 "MissingKeyOnMapPtrToNil",
1582 "{{.MissingKey}}",
1583 &map[string]string{},
1584 "<nil>",
1585 },
1586 }
1587 for _, tc := range tests {
1588 t.Run(tc.name, func(t *testing.T) {
1589 tmpl := Must(New("tmpl").Parse(tc.src))
1590 err := tmpl.Execute(io.Discard, tc.value)
1591 got := "<nil>"
1592 if err != nil {
1593 got = err.Error()
1594 }
1595 if !strings.HasSuffix(got, tc.want) {
1596 t.Fatalf("got error %q, want %q", got, tc.want)
1597 }
1598 })
1599 }
1600 }
1601
1602 func TestMaxExecDepth(t *testing.T) {
1603 if testing.Short() {
1604 t.Skip("skipping in -short mode")
1605 }
1606 tmpl := Must(New("tmpl").Parse(`{{template "tmpl" .}}`))
1607 err := tmpl.Execute(io.Discard, nil)
1608 got := "<nil>"
1609 if err != nil {
1610 got = err.Error()
1611 }
1612 const want = "exceeded maximum template depth"
1613 if !strings.Contains(got, want) {
1614 t.Errorf("got error %q; want %q", got, want)
1615 }
1616 }
1617
1618 func TestAddrOfIndex(t *testing.T) {
1619
1620
1621
1622
1623
1624 texts := []string{
1625 `{{range .}}{{.String}}{{end}}`,
1626 `{{with index . 0}}{{.String}}{{end}}`,
1627 }
1628 for _, text := range texts {
1629 tmpl := Must(New("tmpl").Parse(text))
1630 var buf strings.Builder
1631 err := tmpl.Execute(&buf, reflect.ValueOf([]V{{1}}))
1632 if err != nil {
1633 t.Fatalf("%s: Execute: %v", text, err)
1634 }
1635 if buf.String() != "<1>" {
1636 t.Fatalf("%s: template output = %q, want %q", text, &buf, "<1>")
1637 }
1638 }
1639 }
1640
1641 func TestInterfaceValues(t *testing.T) {
1642
1643
1644
1645
1646
1647
1648 tests := []struct {
1649 text string
1650 out string
1651 }{
1652 {`{{index .Nil 1}}`, "ERROR: index of untyped nil"},
1653 {`{{index .Slice 2}}`, "2"},
1654 {`{{index .Slice .Two}}`, "2"},
1655 {`{{call .Nil 1}}`, "ERROR: call of nil"},
1656 {`{{call .PlusOne 1}}`, "2"},
1657 {`{{call .PlusOne .One}}`, "2"},
1658 {`{{and (index .Slice 0) true}}`, "0"},
1659 {`{{and .Zero true}}`, "0"},
1660 {`{{and (index .Slice 1) false}}`, "false"},
1661 {`{{and .One false}}`, "false"},
1662 {`{{or (index .Slice 0) false}}`, "false"},
1663 {`{{or .Zero false}}`, "false"},
1664 {`{{or (index .Slice 1) true}}`, "1"},
1665 {`{{or .One true}}`, "1"},
1666 {`{{not (index .Slice 0)}}`, "true"},
1667 {`{{not .Zero}}`, "true"},
1668 {`{{not (index .Slice 1)}}`, "false"},
1669 {`{{not .One}}`, "false"},
1670 {`{{eq (index .Slice 0) .Zero}}`, "true"},
1671 {`{{eq (index .Slice 1) .One}}`, "true"},
1672 {`{{ne (index .Slice 0) .Zero}}`, "false"},
1673 {`{{ne (index .Slice 1) .One}}`, "false"},
1674 {`{{ge (index .Slice 0) .One}}`, "false"},
1675 {`{{ge (index .Slice 1) .Zero}}`, "true"},
1676 {`{{gt (index .Slice 0) .One}}`, "false"},
1677 {`{{gt (index .Slice 1) .Zero}}`, "true"},
1678 {`{{le (index .Slice 0) .One}}`, "true"},
1679 {`{{le (index .Slice 1) .Zero}}`, "false"},
1680 {`{{lt (index .Slice 0) .One}}`, "true"},
1681 {`{{lt (index .Slice 1) .Zero}}`, "false"},
1682 }
1683
1684 for _, tt := range tests {
1685 tmpl := Must(New("tmpl").Parse(tt.text))
1686 var buf strings.Builder
1687 err := tmpl.Execute(&buf, map[string]any{
1688 "PlusOne": func(n int) int {
1689 return n + 1
1690 },
1691 "Slice": []int{0, 1, 2, 3},
1692 "One": 1,
1693 "Two": 2,
1694 "Nil": nil,
1695 "Zero": 0,
1696 })
1697 if strings.HasPrefix(tt.out, "ERROR:") {
1698 e := strings.TrimSpace(strings.TrimPrefix(tt.out, "ERROR:"))
1699 if err == nil || !strings.Contains(err.Error(), e) {
1700 t.Errorf("%s: Execute: %v, want error %q", tt.text, err, e)
1701 }
1702 continue
1703 }
1704 if err != nil {
1705 t.Errorf("%s: Execute: %v", tt.text, err)
1706 continue
1707 }
1708 if buf.String() != tt.out {
1709 t.Errorf("%s: template output = %q, want %q", tt.text, &buf, tt.out)
1710 }
1711 }
1712 }
1713
1714
1715 func TestExecutePanicDuringCall(t *testing.T) {
1716 funcs := map[string]any{
1717 "doPanic": func() string {
1718 panic("custom panic string")
1719 },
1720 }
1721 tests := []struct {
1722 name string
1723 input string
1724 data any
1725 wantErr string
1726 }{
1727 {
1728 "direct func call panics",
1729 "{{doPanic}}", (*T)(nil),
1730 `template: t:1:2: executing "t" at <doPanic>: error calling doPanic: custom panic string`,
1731 },
1732 {
1733 "indirect func call panics",
1734 "{{call doPanic}}", (*T)(nil),
1735 `template: t:1:7: executing "t" at <doPanic>: error calling doPanic: custom panic string`,
1736 },
1737 {
1738 "direct method call panics",
1739 "{{.GetU}}", (*T)(nil),
1740 `template: t:1:2: executing "t" at <.GetU>: error calling GetU: runtime error: invalid memory address or nil pointer dereference`,
1741 },
1742 {
1743 "indirect method call panics",
1744 "{{call .GetU}}", (*T)(nil),
1745 `template: t:1:7: executing "t" at <.GetU>: error calling GetU: runtime error: invalid memory address or nil pointer dereference`,
1746 },
1747 {
1748 "func field call panics",
1749 "{{call .PanicFunc}}", tVal,
1750 `template: t:1:2: executing "t" at <call .PanicFunc>: error calling call: test panic`,
1751 },
1752 {
1753 "method call on nil interface",
1754 "{{.NonEmptyInterfaceNil.Method0}}", tVal,
1755 `template: t:1:23: executing "t" at <.NonEmptyInterfaceNil.Method0>: nil pointer evaluating template.I.Method0`,
1756 },
1757 }
1758 for _, tc := range tests {
1759 b := new(bytes.Buffer)
1760 tmpl, err := New("t").Funcs(funcs).Parse(tc.input)
1761 if err != nil {
1762 t.Fatalf("parse error: %s", err)
1763 }
1764 err = tmpl.Execute(b, tc.data)
1765 if err == nil {
1766 t.Errorf("%s: expected error; got none", tc.name)
1767 } else if !strings.Contains(err.Error(), tc.wantErr) {
1768 if *debug {
1769 fmt.Printf("%s: test execute error: %s\n", tc.name, err)
1770 }
1771 t.Errorf("%s: expected error:\n%s\ngot:\n%s", tc.name, tc.wantErr, err)
1772 }
1773 }
1774 }
1775
1776 func TestFunctionCheckDuringCall(t *testing.T) {
1777 tests := []struct {
1778 name string
1779 input string
1780 data any
1781 wantErr string
1782 }{{
1783 name: "call nothing",
1784 input: `{{call}}`,
1785 data: tVal,
1786 wantErr: "wrong number of args for call: want at least 1 got 0",
1787 },
1788 {
1789 name: "call non-function",
1790 input: "{{call .True}}",
1791 data: tVal,
1792 wantErr: "error calling call: non-function .True of type bool",
1793 },
1794 {
1795 name: "call func with wrong argument",
1796 input: "{{call .BinaryFunc 1}}",
1797 data: tVal,
1798 wantErr: "error calling call: wrong number of args for .BinaryFunc: got 1 want 2",
1799 },
1800 {
1801 name: "call variadic func with wrong argument",
1802 input: `{{call .VariadicFuncInt}}`,
1803 data: tVal,
1804 wantErr: "error calling call: wrong number of args for .VariadicFuncInt: got 0 want at least 1",
1805 },
1806 {
1807 name: "call too few return number func",
1808 input: `{{call .TooFewReturnCountFunc}}`,
1809 data: tVal,
1810 wantErr: "error calling call: function .TooFewReturnCountFunc has 0 return values; should be 1 or 2",
1811 },
1812 {
1813 name: "call too many return number func",
1814 input: `{{call .TooManyReturnCountFunc}}`,
1815 data: tVal,
1816 wantErr: "error calling call: function .TooManyReturnCountFunc has 3 return values; should be 1 or 2",
1817 },
1818 {
1819 name: "call invalid return type func",
1820 input: `{{call .InvalidReturnTypeFunc}}`,
1821 data: tVal,
1822 wantErr: "error calling call: invalid function signature for .InvalidReturnTypeFunc: second return value should be error; is bool",
1823 },
1824 {
1825 name: "call pipeline",
1826 input: `{{call (len "test")}}`,
1827 data: nil,
1828 wantErr: "error calling call: non-function len \"test\" of type int",
1829 },
1830 }
1831
1832 for _, tc := range tests {
1833 b := new(bytes.Buffer)
1834 tmpl, err := New("t").Parse(tc.input)
1835 if err != nil {
1836 t.Fatalf("parse error: %s", err)
1837 }
1838 err = tmpl.Execute(b, tc.data)
1839 if err == nil {
1840 t.Errorf("%s: expected error; got none", tc.name)
1841 } else if tc.wantErr == "" || !strings.Contains(err.Error(), tc.wantErr) {
1842 if *debug {
1843 fmt.Printf("%s: test execute error: %s\n", tc.name, err)
1844 }
1845 t.Errorf("%s: expected error:\n%s\ngot:\n%s", tc.name, tc.wantErr, err)
1846 }
1847 }
1848 }
1849
1850
1851 func TestIssue31810(t *testing.T) {
1852
1853 var b strings.Builder
1854 const text = "{{ (.) }}"
1855 tmpl, err := New("").Parse(text)
1856 if err != nil {
1857 t.Error(err)
1858 }
1859 err = tmpl.Execute(&b, "result")
1860 if err != nil {
1861 t.Error(err)
1862 }
1863 if b.String() != "result" {
1864 t.Errorf("%s got %q, expected %q", text, b.String(), "result")
1865 }
1866
1867
1868 f := func() string { return "result" }
1869 b.Reset()
1870 err = tmpl.Execute(&b, f)
1871 if err == nil {
1872 t.Error("expected error with no call, got none")
1873 }
1874
1875
1876 const textCall = "{{ (call .) }}"
1877 tmpl, err = New("").Parse(textCall)
1878 b.Reset()
1879 err = tmpl.Execute(&b, f)
1880 if err != nil {
1881 t.Error(err)
1882 }
1883 if b.String() != "result" {
1884 t.Errorf("%s got %q, expected %q", textCall, b.String(), "result")
1885 }
1886 }
1887
1888
1889 func TestIssue43065(t *testing.T) {
1890 var b bytes.Buffer
1891 tmp := Must(New("").Parse(`{{range .}}{{end}}`))
1892 ch := make(chan<- int)
1893 err := tmp.Execute(&b, ch)
1894 if err == nil {
1895 t.Error("expected err got nil")
1896 } else if !strings.Contains(err.Error(), "range over send-only channel") {
1897 t.Errorf("%s", err)
1898 }
1899 }
1900
1901
1902 func TestIssue39807(t *testing.T) {
1903 var wg sync.WaitGroup
1904
1905 tplFoo, err := New("foo").Parse(`{{ template "bar" . }}`)
1906 if err != nil {
1907 t.Error(err)
1908 }
1909
1910 tplBar, err := New("bar").Parse("bar")
1911 if err != nil {
1912 t.Error(err)
1913 }
1914
1915 gofuncs := 10
1916 numTemplates := 10
1917
1918 for i := 1; i <= gofuncs; i++ {
1919 wg.Add(1)
1920 go func() {
1921 defer wg.Done()
1922 for j := 0; j < numTemplates; j++ {
1923 _, err := tplFoo.AddParseTree(tplBar.Name(), tplBar.Tree)
1924 if err != nil {
1925 t.Error(err)
1926 }
1927 err = tplFoo.Execute(io.Discard, nil)
1928 if err != nil {
1929 t.Error(err)
1930 }
1931 }
1932 }()
1933 }
1934
1935 wg.Wait()
1936 }
1937
1938
1939
1940 func TestIssue48215(t *testing.T) {
1941 type A struct {
1942 S string
1943 }
1944 type B struct {
1945 *A
1946 }
1947 tmpl, err := New("").Parse(`{{ .S }}`)
1948 if err != nil {
1949 t.Fatal(err)
1950 }
1951 err = tmpl.Execute(io.Discard, B{})
1952
1953 if err == nil {
1954 t.Fatal("did not get error for nil embedded struct")
1955 }
1956 if !strings.Contains(err.Error(), "reflect: indirection through nil pointer to embedded struct field A") {
1957 t.Fatal(err)
1958 }
1959 }
1960
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