| // 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/ioutil" |
| "reflect" |
| "strings" |
| "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[interface{}]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 interface{} // nil |
| Empty1 interface{} |
| Empty2 interface{} |
| Empty3 interface{} |
| Empty4 interface{} |
| // 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[interface{}]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 interface{}) 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 interface{}) string { |
| return fmt.Sprintf("%T", arg) |
| } |
| |
| type execTest struct { |
| name string |
| input string |
| output string |
| data interface{} |
| 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]interface{}{"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}, |
| {"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}, |
| |
| // 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}, |
| |
| // 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}, |
| |
| // 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}, |
| |
| // 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 []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}, |
| } |
| |
| 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 interface{}) interface{} { |
| 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() interface{} { |
| return map[string]int{"three": 3} |
| } |
| |
| func testExecute(execTests []execTest, template *Template, t *testing.T) { |
| b := new(bytes.Buffer) |
| funcs := FuncMap{ |
| "add": add, |
| "count": count, |
| "dddArg": dddArg, |
| "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(bytes.Buffer) |
| 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) |
| } |
| } |
| |
| 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 \uFDFF", `unprintable \uFDFF`}, |
| {`<html>`, `\x3Chtml\x3E`}, |
| } |
| 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{ |
| 5, |
| &Tree{ |
| 6, nil, nil, |
| }, |
| nil, |
| }, |
| }, |
| &Tree{ |
| 7, |
| &Tree{ |
| 8, |
| &Tree{ |
| 9, nil, nil, |
| }, |
| nil, |
| }, |
| &Tree{ |
| 10, |
| &Tree{ |
| 11, nil, nil, |
| }, |
| nil, |
| }, |
| }, |
| } |
| tmpl, err := New("root").Delims("(", ")").Parse(treeTemplate) |
| if err != nil { |
| t.Fatal("parse error:", err) |
| } |
| var b bytes.Buffer |
| const expect = "[1[2[3[4]][5[6]]][7[8[9]][10[11]]]]" |
| // First by looking up the template. |
| err = tmpl.Lookup("tree").Execute(&b, tree) |
| if err != nil { |
| t.Fatal("exec error:", err) |
| } |
| result := b.String() |
| if result != expect { |
| t.Errorf("expected %q got %q", expect, result) |
| } |
| // Then direct to execution. |
| b.Reset() |
| err = tmpl.ExecuteTemplate(&b, "tree", tree) |
| if err != nil { |
| t.Fatal("exec error:", err) |
| } |
| result = b.String() |
| if result != expect { |
| t.Errorf("expected %q got %q", expect, result) |
| } |
| } |
| |
| func TestExecuteOnNewTemplate(t *testing.T) { |
| // This is issue 3872. |
| New("Name").Templates() |
| // This is issue 11379. |
| new(Template).Templates() |
| new(Template).Parse("") |
| new(Template).New("abc").Parse("") |
| new(Template).Execute(nil, nil) // returns an error (but does not crash) |
| new(Template).ExecuteTemplate(nil, "XXX", nil) // returns an error (but does not crash) |
| } |
| |
| const testTemplates = `{{define "one"}}one{{end}}{{define "two"}}two{{end}}` |
| |
| func TestMessageForExecuteEmpty(t *testing.T) { |
| // Test a truly empty template. |
| tmpl := New("empty") |
| var b bytes.Buffer |
| err := tmpl.Execute(&b, 0) |
| if err == nil { |
| t.Fatal("expected initial error") |
| } |
| got := err.Error() |
| want := `template: empty: "empty" is an incomplete or empty template` |
| if got != want { |
| t.Errorf("expected error %s got %s", want, got) |
| } |
| // Add a non-empty template to check that the error is helpful. |
| tests, err := New("").Parse(testTemplates) |
| if err != nil { |
| t.Fatal(err) |
| } |
| tmpl.AddParseTree("secondary", tests.Tree) |
| err = tmpl.Execute(&b, 0) |
| if err == nil { |
| t.Fatal("expected second error") |
| } |
| got = err.Error() |
| want = `template: empty: "empty" is an incomplete or empty template` |
| if got != want { |
| t.Errorf("expected error %s got %s", want, got) |
| } |
| // Make sure we can execute the secondary. |
| err = tmpl.ExecuteTemplate(&b, "secondary", 0) |
| if err != nil { |
| t.Fatal(err) |
| } |
| } |
| |
| func TestFinalForPrintf(t *testing.T) { |
| tmpl, err := New("").Parse(`{{"x" | printf}}`) |
| if err != nil { |
| t.Fatal(err) |
| } |
| var b bytes.Buffer |
| err = tmpl.Execute(&b, 0) |
| if err != nil { |
| t.Fatal(err) |
| } |
| } |
| |
| type cmpTest struct { |
| expr string |
| truth string |
| ok bool |
| } |
| |
| var cmpTests = []cmpTest{ |
| {"eq true true", "true", true}, |
| {"eq true false", "false", true}, |
| {"eq 1+2i 1+2i", "true", true}, |
| {"eq 1+2i 1+3i", "false", true}, |
| {"eq 1.5 1.5", "true", true}, |
| {"eq 1.5 2.5", "false", true}, |
| {"eq 1 1", "true", true}, |
| {"eq 1 2", "false", true}, |
| {"eq `xy` `xy`", "true", true}, |
| {"eq `xy` `xyz`", "false", true}, |
| {"eq .Uthree .Uthree", "true", true}, |
| {"eq .Uthree .Ufour", "false", true}, |
| {"eq 3 4 5 6 3", "true", true}, |
| {"eq 3 4 5 6 7", "false", true}, |
| {"ne true true", "false", true}, |
| {"ne true false", "true", true}, |
| {"ne 1+2i 1+2i", "false", true}, |
| {"ne 1+2i 1+3i", "true", true}, |
| {"ne 1.5 1.5", "false", true}, |
| {"ne 1.5 2.5", "true", true}, |
| {"ne 1 1", "false", true}, |
| {"ne 1 2", "true", true}, |
| {"ne `xy` `xy`", "false", true}, |
| {"ne `xy` `xyz`", "true", true}, |
| {"ne .Uthree .Uthree", "false", true}, |
| {"ne .Uthree .Ufour", "true", true}, |
| {"lt 1.5 1.5", "false", true}, |
| {"lt 1.5 2.5", "true", true}, |
| {"lt 1 1", "false", true}, |
| {"lt 1 2", "true", true}, |
| {"lt `xy` `xy`", "false", true}, |
| {"lt `xy` `xyz`", "true", true}, |
| {"lt .Uthree .Uthree", "false", true}, |
| {"lt .Uthree .Ufour", "true", true}, |
| {"le 1.5 1.5", "true", true}, |
| {"le 1.5 2.5", "true", true}, |
| {"le 2.5 1.5", "false", true}, |
| {"le 1 1", "true", true}, |
| {"le 1 2", "true", true}, |
| {"le 2 1", "false", true}, |
| {"le `xy` `xy`", "true", true}, |
| {"le `xy` `xyz`", "true", true}, |
| {"le `xyz` `xy`", "false", true}, |
| {"le .Uthree .Uthree", "true", true}, |
| {"le .Uthree .Ufour", "true", true}, |
| {"le .Ufour .Uthree", "false", true}, |
| {"gt 1.5 1.5", "false", true}, |
| {"gt 1.5 2.5", "false", true}, |
| {"gt 1 1", "false", true}, |
| {"gt 2 1", "true", true}, |
| {"gt 1 2", "false", true}, |
| {"gt `xy` `xy`", "false", true}, |
| {"gt `xy` `xyz`", "false", true}, |
| {"gt .Uthree .Uthree", "false", true}, |
| {"gt .Uthree .Ufour", "false", true}, |
| {"gt .Ufour .Uthree", "true", true}, |
| {"ge 1.5 1.5", "true", true}, |
| {"ge 1.5 2.5", "false", true}, |
| {"ge 2.5 1.5", "true", true}, |
| {"ge 1 1", "true", true}, |
| {"ge 1 2", "false", true}, |
| {"ge 2 1", "true", true}, |
| {"ge `xy` `xy`", "true", true}, |
| {"ge `xy` `xyz`", "false", true}, |
| {"ge `xyz` `xy`", "true", true}, |
| {"ge .Uthree .Uthree", "true", true}, |
| {"ge .Uthree .Ufour", "false", true}, |
| {"ge .Ufour .Uthree", "true", true}, |
| // Mixing signed and unsigned integers. |
| {"eq .Uthree .Three", "true", true}, |
| {"eq .Three .Uthree", "true", true}, |
| {"le .Uthree .Three", "true", true}, |
| {"le .Three .Uthree", "true", true}, |
| {"ge .Uthree .Three", "true", true}, |
| {"ge .Three .Uthree", "true", true}, |
| {"lt .Uthree .Three", "false", true}, |
| {"lt .Three .Uthree", "false", true}, |
| {"gt .Uthree .Three", "false", true}, |
| {"gt .Three .Uthree", "false", true}, |
| {"eq .Ufour .Three", "false", true}, |
| {"lt .Ufour .Three", "false", true}, |
| {"gt .Ufour .Three", "true", true}, |
| {"eq .NegOne .Uthree", "false", true}, |
| {"eq .Uthree .NegOne", "false", true}, |
| {"ne .NegOne .Uthree", "true", true}, |
| {"ne .Uthree .NegOne", "true", true}, |
| {"lt .NegOne .Uthree", "true", true}, |
| {"lt .Uthree .NegOne", "false", true}, |
| {"le .NegOne .Uthree", "true", true}, |
| {"le .Uthree .NegOne", "false", true}, |
| {"gt .NegOne .Uthree", "false", true}, |
| {"gt .Uthree .NegOne", "true", true}, |
| {"ge .NegOne .Uthree", "false", true}, |
| {"ge .Uthree .NegOne", "true", true}, |
| {"eq (index `x` 0) 'x'", "true", true}, // The example that triggered this rule. |
| {"eq (index `x` 0) 'y'", "false", true}, |
| {"eq .V1 .V2", "true", true}, |
| {"eq .Ptr .Ptr", "true", true}, |
| {"eq .Ptr .NilPtr", "false", true}, |
| {"eq .NilPtr .NilPtr", "true", true}, |
| {"eq .Iface1 .Iface1", "true", true}, |
| {"eq .Iface1 .Iface2", "false", true}, |
| {"eq .Iface2 .Iface2", "true", true}, |
| // Errors |
| {"eq `xy` 1", "", false}, // Different types. |
| {"eq 2 2.0", "", false}, // Different types. |
| {"lt true true", "", false}, // Unordered types. |
| {"lt 1+0i 1+0i", "", false}, // Unordered types. |
| {"eq .Ptr 1", "", false}, // Incompatible types. |
| {"eq .Ptr .NegOne", "", false}, // Incompatible types. |
| {"eq .Map .Map", "", false}, // Uncomparable types. |
| {"eq .Map .V1", "", false}, // Uncomparable types. |
| } |
| |
| func TestComparison(t *testing.T) { |
| b := new(bytes.Buffer) |
| var cmpStruct = struct { |
| Uthree, Ufour uint |
| NegOne, Three int |
| Ptr, NilPtr *int |
| Map map[int]int |
| V1, V2 V |
| Iface1, Iface2 fmt.Stringer |
| }{ |
| Uthree: 3, |
| Ufour: 4, |
| NegOne: -1, |
| Three: 3, |
| Ptr: new(int), |
| Iface1: b, |
| } |
| for _, test := range cmpTests { |
| text := fmt.Sprintf("{{if %s}}true{{else}}false{{end}}", test.expr) |
| tmpl, err := New("empty").Parse(text) |
| if err != nil { |
| t.Fatalf("%q: %s", test.expr, err) |
| } |
| b.Reset() |
| err = tmpl.Execute(b, &cmpStruct) |
| if test.ok && err != nil { |
| t.Errorf("%s errored incorrectly: %s", test.expr, err) |
| continue |
| } |
| if !test.ok && err == nil { |
| t.Errorf("%s did not error", test.expr) |
| continue |
| } |
| if b.String() != test.truth { |
| t.Errorf("%s: want %s; got %s", test.expr, test.truth, b.String()) |
| } |
| } |
| } |
| |
| func TestMissingMapKey(t *testing.T) { |
| data := map[string]int{ |
| "x": 99, |
| } |
| tmpl, err := New("t1").Parse("{{.x}} {{.y}}") |
| if err != nil { |
| t.Fatal(err) |
| } |
| var b bytes.Buffer |
| // By default, just get "<no value>" |
| err = tmpl.Execute(&b, data) |
| if err != nil { |
| t.Fatal(err) |
| } |
| want := "99 <no value>" |
| got := b.String() |
| if got != want { |
| t.Errorf("got %q; expected %q", got, want) |
| } |
| // Same if we set the option explicitly to the default. |
| tmpl.Option("missingkey=default") |
| b.Reset() |
| err = tmpl.Execute(&b, data) |
| if err != nil { |
| t.Fatal("default:", err) |
| } |
| want = "99 <no value>" |
| got = b.String() |
| if got != want { |
| t.Errorf("got %q; expected %q", got, want) |
| } |
| // Next we ask for a zero value |
| tmpl.Option("missingkey=zero") |
| b.Reset() |
| err = tmpl.Execute(&b, data) |
| if err != nil { |
| t.Fatal("zero:", err) |
| } |
| want = "99 0" |
| got = b.String() |
| if got != want { |
| t.Errorf("got %q; expected %q", got, want) |
| } |
| // Now we ask for an error. |
| tmpl.Option("missingkey=error") |
| err = tmpl.Execute(&b, data) |
| if err == nil { |
| t.Errorf("expected error; got none") |
| } |
| // same Option, but now a nil interface: ask for an error |
| err = tmpl.Execute(&b, nil) |
| t.Log(err) |
| if err == nil { |
| t.Errorf("expected error for nil-interface; got none") |
| } |
| } |
| |
| // Test that the error message for multiline unterminated string |
| // refers to the line number of the opening quote. |
| func TestUnterminatedStringError(t *testing.T) { |
| _, err := New("X").Parse("hello\n\n{{`unterminated\n\n\n\n}}\n some more\n\n") |
| if err == nil { |
| t.Fatal("expected error") |
| } |
| str := err.Error() |
| if !strings.Contains(str, "X:3: unexpected unterminated raw quoted string") { |
| t.Fatalf("unexpected error: %s", str) |
| } |
| } |
| |
| const alwaysErrorText = "always be failing" |
| |
| var alwaysError = errors.New(alwaysErrorText) |
| |
| type ErrorWriter int |
| |
| func (e ErrorWriter) Write(p []byte) (int, error) { |
| return 0, alwaysError |
| } |
| |
| func TestExecuteGivesExecError(t *testing.T) { |
| // First, a non-execution error shouldn't be an ExecError. |
| tmpl, err := New("X").Parse("hello") |
| if err != nil { |
| t.Fatal(err) |
| } |
| err = tmpl.Execute(ErrorWriter(0), 0) |
| if err == nil { |
| t.Fatal("expected error; got none") |
| } |
| if err.Error() != alwaysErrorText { |
| t.Errorf("expected %q error; got %q", alwaysErrorText, err) |
| } |
| // This one should be an ExecError. |
| tmpl, err = New("X").Parse("hello, {{.X.Y}}") |
| if err != nil { |
| t.Fatal(err) |
| } |
| err = tmpl.Execute(ioutil.Discard, 0) |
| if err == nil { |
| t.Fatal("expected error; got none") |
| } |
| eerr, ok := err.(ExecError) |
| if !ok { |
| t.Fatalf("did not expect ExecError %s", eerr) |
| } |
| expect := "field X in type int" |
| if !strings.Contains(err.Error(), expect) { |
| t.Errorf("expected %q; got %q", expect, err) |
| } |
| } |
| |
| func funcNameTestFunc() int { |
| return 0 |
| } |
| |
| func TestGoodFuncNames(t *testing.T) { |
| names := []string{ |
| "_", |
| "a", |
| "a1", |
| "a1", |
| "Ӵ", |
| } |
| for _, name := range names { |
| tmpl := New("X").Funcs( |
| FuncMap{ |
| name: funcNameTestFunc, |
| }, |
| ) |
| if tmpl == nil { |
| t.Fatalf("nil result for %q", name) |
| } |
| } |
| } |
| |
| func TestBadFuncNames(t *testing.T) { |
| names := []string{ |
| "", |
| "2", |
| "a-b", |
| } |
| for _, name := range names { |
| testBadFuncName(name, t) |
| } |
| } |
| |
| func testBadFuncName(name string, t *testing.T) { |
| t.Helper() |
| defer func() { |
| recover() |
| }() |
| New("X").Funcs( |
| FuncMap{ |
| name: funcNameTestFunc, |
| }, |
| ) |
| // If we get here, the name did not cause a panic, which is how Funcs |
| // reports an error. |
| t.Errorf("%q succeeded incorrectly as function name", name) |
| } |
| |
| func TestBlock(t *testing.T) { |
| const ( |
| input = `a({{block "inner" .}}bar({{.}})baz{{end}})b` |
| want = `a(bar(hello)baz)b` |
| overlay = `{{define "inner"}}foo({{.}})bar{{end}}` |
| want2 = `a(foo(goodbye)bar)b` |
| ) |
| tmpl, err := New("outer").Parse(input) |
| if err != nil { |
| t.Fatal(err) |
| } |
| tmpl2, err := Must(tmpl.Clone()).Parse(overlay) |
| if err != nil { |
| t.Fatal(err) |
| } |
| |
| var buf bytes.Buffer |
| if err := tmpl.Execute(&buf, "hello"); err != nil { |
| t.Fatal(err) |
| } |
| if got := buf.String(); got != want { |
| t.Errorf("got %q, want %q", got, want) |
| } |
| |
| buf.Reset() |
| if err := tmpl2.Execute(&buf, "goodbye"); err != nil { |
| t.Fatal(err) |
| } |
| if got := buf.String(); got != want2 { |
| t.Errorf("got %q, want %q", got, want2) |
| } |
| } |
| |
| func TestEvalFieldErrors(t *testing.T) { |
| tests := []struct { |
| name, src string |
| value interface{} |
| want string |
| }{ |
| { |
| // Check that calling an invalid field on nil pointer |
| // prints a field error instead of a distracting nil |
| // pointer error. https://golang.org/issue/15125 |
| "MissingFieldOnNil", |
| "{{.MissingField}}", |
| (*T)(nil), |
| "can't evaluate field MissingField in type *template.T", |
| }, |
| { |
| "MissingFieldOnNonNil", |
| "{{.MissingField}}", |
| &T{}, |
| "can't evaluate field MissingField in type *template.T", |
| }, |
| { |
| "ExistingFieldOnNil", |
| "{{.X}}", |
| (*T)(nil), |
| "nil pointer evaluating *template.T.X", |
| }, |
| { |
| "MissingKeyOnNilMap", |
| "{{.MissingKey}}", |
| (*map[string]string)(nil), |
| "nil pointer evaluating *map[string]string.MissingKey", |
| }, |
| { |
| "MissingKeyOnNilMapPtr", |
| "{{.MissingKey}}", |
| (*map[string]string)(nil), |
| "nil pointer evaluating *map[string]string.MissingKey", |
| }, |
| { |
| "MissingKeyOnMapPtrToNil", |
| "{{.MissingKey}}", |
| &map[string]string{}, |
| "<nil>", |
| }, |
| } |
| for _, tc := range tests { |
| t.Run(tc.name, func(t *testing.T) { |
| tmpl := Must(New("tmpl").Parse(tc.src)) |
| err := tmpl.Execute(ioutil.Discard, tc.value) |
| got := "<nil>" |
| if err != nil { |
| got = err.Error() |
| } |
| if !strings.HasSuffix(got, tc.want) { |
| t.Fatalf("got error %q, want %q", got, tc.want) |
| } |
| }) |
| } |
| } |
| |
| func TestMaxExecDepth(t *testing.T) { |
| if testing.Short() { |
| t.Skip("skipping in -short mode") |
| } |
| tmpl := Must(New("tmpl").Parse(`{{template "tmpl" .}}`)) |
| err := tmpl.Execute(ioutil.Discard, nil) |
| got := "<nil>" |
| if err != nil { |
| got = err.Error() |
| } |
| const want = "exceeded maximum template depth" |
| if !strings.Contains(got, want) { |
| t.Errorf("got error %q; want %q", got, want) |
| } |
| } |
| |
| func TestAddrOfIndex(t *testing.T) { |
| // golang.org/issue/14916. |
| // Before index worked on reflect.Values, the .String could not be |
| // found on the (incorrectly unaddressable) V value, |
| // in contrast to range, which worked fine. |
| // Also testing that passing a reflect.Value to tmpl.Execute works. |
| texts := []string{ |
| `{{range .}}{{.String}}{{end}}`, |
| `{{with index . 0}}{{.String}}{{end}}`, |
| } |
| for _, text := range texts { |
| tmpl := Must(New("tmpl").Parse(text)) |
| var buf bytes.Buffer |
| err := tmpl.Execute(&buf, reflect.ValueOf([]V{{1}})) |
| if err != nil { |
| t.Fatalf("%s: Execute: %v", text, err) |
| } |
| if buf.String() != "<1>" { |
| t.Fatalf("%s: template output = %q, want %q", text, &buf, "<1>") |
| } |
| } |
| } |
| |
| func TestInterfaceValues(t *testing.T) { |
| // golang.org/issue/17714. |
| // Before index worked on reflect.Values, interface values |
| // were always implicitly promoted to the underlying value, |
| // except that nil interfaces were promoted to the zero reflect.Value. |
| // Eliminating a round trip to interface{} and back to reflect.Value |
| // eliminated this promotion, breaking these cases. |
| tests := []struct { |
| text string |
| out string |
| }{ |
| {`{{index .Nil 1}}`, "ERROR: index of untyped nil"}, |
| {`{{index .Slice 2}}`, "2"}, |
| {`{{index .Slice .Two}}`, "2"}, |
| {`{{call .Nil 1}}`, "ERROR: call of nil"}, |
| {`{{call .PlusOne 1}}`, "2"}, |
| {`{{call .PlusOne .One}}`, "2"}, |
| {`{{and (index .Slice 0) true}}`, "0"}, |
| {`{{and .Zero true}}`, "0"}, |
| {`{{and (index .Slice 1) false}}`, "false"}, |
| {`{{and .One false}}`, "false"}, |
| {`{{or (index .Slice 0) false}}`, "false"}, |
| {`{{or .Zero false}}`, "false"}, |
| {`{{or (index .Slice 1) true}}`, "1"}, |
| {`{{or .One true}}`, "1"}, |
| {`{{not (index .Slice 0)}}`, "true"}, |
| {`{{not .Zero}}`, "true"}, |
| {`{{not (index .Slice 1)}}`, "false"}, |
| {`{{not .One}}`, "false"}, |
| {`{{eq (index .Slice 0) .Zero}}`, "true"}, |
| {`{{eq (index .Slice 1) .One}}`, "true"}, |
| {`{{ne (index .Slice 0) .Zero}}`, "false"}, |
| {`{{ne (index .Slice 1) .One}}`, "false"}, |
| {`{{ge (index .Slice 0) .One}}`, "false"}, |
| {`{{ge (index .Slice 1) .Zero}}`, "true"}, |
| {`{{gt (index .Slice 0) .One}}`, "false"}, |
| {`{{gt (index .Slice 1) .Zero}}`, "true"}, |
| {`{{le (index .Slice 0) .One}}`, "true"}, |
| {`{{le (index .Slice 1) .Zero}}`, "false"}, |
| {`{{lt (index .Slice 0) .One}}`, "true"}, |
| {`{{lt (index .Slice 1) .Zero}}`, "false"}, |
| } |
| |
| for _, tt := range tests { |
| tmpl := Must(New("tmpl").Parse(tt.text)) |
| var buf bytes.Buffer |
| err := tmpl.Execute(&buf, map[string]interface{}{ |
| "PlusOne": func(n int) int { |
| return n + 1 |
| }, |
| "Slice": []int{0, 1, 2, 3}, |
| "One": 1, |
| "Two": 2, |
| "Nil": nil, |
| "Zero": 0, |
| }) |
| if strings.HasPrefix(tt.out, "ERROR:") { |
| e := strings.TrimSpace(strings.TrimPrefix(tt.out, "ERROR:")) |
| if err == nil || !strings.Contains(err.Error(), e) { |
| t.Errorf("%s: Execute: %v, want error %q", tt.text, err, e) |
| } |
| continue |
| } |
| if err != nil { |
| t.Errorf("%s: Execute: %v", tt.text, err) |
| continue |
| } |
| if buf.String() != tt.out { |
| t.Errorf("%s: template output = %q, want %q", tt.text, &buf, tt.out) |
| } |
| } |
| } |
| |
| // Check that panics during calls are recovered and returned as errors. |
| func TestExecutePanicDuringCall(t *testing.T) { |
| funcs := map[string]interface{}{ |
| "doPanic": func() string { |
| panic("custom panic string") |
| }, |
| } |
| tests := []struct { |
| name string |
| input string |
| data interface{} |
| wantErr string |
| }{ |
| { |
| "direct func call panics", |
| "{{doPanic}}", (*T)(nil), |
| `template: t:1:2: executing "t" at <doPanic>: error calling doPanic: custom panic string`, |
| }, |
| { |
| "indirect func call panics", |
| "{{call doPanic}}", (*T)(nil), |
| `template: t:1:7: executing "t" at <doPanic>: error calling doPanic: custom panic string`, |
| }, |
| { |
| "direct method call panics", |
| "{{.GetU}}", (*T)(nil), |
| `template: t:1:2: executing "t" at <.GetU>: error calling GetU: runtime error: invalid memory address or nil pointer dereference`, |
| }, |
| { |
| "indirect method call panics", |
| "{{call .GetU}}", (*T)(nil), |
| `template: t:1:7: executing "t" at <.GetU>: error calling GetU: runtime error: invalid memory address or nil pointer dereference`, |
| }, |
| { |
| "func field call panics", |
| "{{call .PanicFunc}}", tVal, |
| `template: t:1:2: executing "t" at <call .PanicFunc>: error calling call: test panic`, |
| }, |
| { |
| "method call on nil interface", |
| "{{.NonEmptyInterfaceNil.Method0}}", tVal, |
| `template: t:1:23: executing "t" at <.NonEmptyInterfaceNil.Method0>: nil pointer evaluating template.I.Method0`, |
| }, |
| } |
| for _, tc := range tests { |
| b := new(bytes.Buffer) |
| tmpl, err := New("t").Funcs(funcs).Parse(tc.input) |
| if err != nil { |
| t.Fatalf("parse error: %s", err) |
| } |
| err = tmpl.Execute(b, tc.data) |
| if err == nil { |
| t.Errorf("%s: expected error; got none", tc.name) |
| } else if !strings.Contains(err.Error(), tc.wantErr) { |
| if *debug { |
| fmt.Printf("%s: test execute error: %s\n", tc.name, err) |
| } |
| t.Errorf("%s: expected error:\n%s\ngot:\n%s", tc.name, tc.wantErr, err) |
| } |
| } |
| } |
| |
| // Issue 31810. Check that a parenthesized first argument behaves properly. |
| func TestIssue31810(t *testing.T) { |
| // A simple value with no arguments is fine. |
| var b bytes.Buffer |
| const text = "{{ (.) }}" |
| tmpl, err := New("").Parse(text) |
| if err != nil { |
| t.Error(err) |
| } |
| err = tmpl.Execute(&b, "result") |
| if err != nil { |
| t.Error(err) |
| } |
| if b.String() != "result" { |
| t.Errorf("%s got %q, expected %q", text, b.String(), "result") |
| } |
| |
| // Even a plain function fails - need to use call. |
| f := func() string { return "result" } |
| b.Reset() |
| err = tmpl.Execute(&b, f) |
| if err == nil { |
| t.Error("expected error with no call, got none") |
| } |
| |
| // Works if the function is explicitly called. |
| const textCall = "{{ (call .) }}" |
| tmpl, err = New("").Parse(textCall) |
| b.Reset() |
| err = tmpl.Execute(&b, f) |
| if err != nil { |
| t.Error(err) |
| } |
| if b.String() != "result" { |
| t.Errorf("%s got %q, expected %q", textCall, b.String(), "result") |
| } |
| } |
