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Diffstat (limited to 'src/html/template/exec_test.go')
| -rw-r--r-- | src/html/template/exec_test.go | 1831 |
1 files changed, 1831 insertions, 0 deletions
diff --git a/src/html/template/exec_test.go b/src/html/template/exec_test.go new file mode 100644 index 0000000..8885873 --- /dev/null +++ b/src/html/template/exec_test.go @@ -0,0 +1,1831 @@ +// 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. + +// Tests for template execution, copied from text/template. + +package template + +import ( + "bytes" + "errors" + "flag" + "fmt" + "io" + "reflect" + "strings" + "sync" + "testing" + "text/template" +) + +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}}", "", tVal, true}, // NOTE: <no value> in text/template + {"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}, // NOTE: -<6666>- in text/template + {"&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}, // NOTE: -[888] in text/template + {"&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}}", "", tVal, true}, // NOTE: <no value> in text/template + {"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}}", "", nil, true}, // NOTE: <no value> in text/template + {"field on parenthesized interface", "{{(.).foo}}", "", nil, true}, // NOTE: <no value> in text/template + + // 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}}`, "<nil>", tVal, true}, // NOTE: "<no value>" in text/template + + // 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}, + {"index of an interface field", "{{index .Empty3 0}}", "7", tVal, true}, + + // Slicing. + {"slice[:]", "{{slice .SI}}", "[3 4 5]", tVal, true}, + {"slice[1:]", "{{slice .SI 1}}", "[4 5]", tVal, true}, + {"slice[1:2]", "{{slice .SI 1 2}}", "[4]", tVal, true}, + {"slice[-1:]", "{{slice .SI -1}}", "", tVal, false}, + {"slice[1:-2]", "{{slice .SI 1 -2}}", "", tVal, false}, + {"slice[1:2:-1]", "{{slice .SI 1 2 -1}}", "", tVal, false}, + {"slice[2:1]", "{{slice .SI 2 1}}", "", tVal, false}, + {"slice[2:2:1]", "{{slice .SI 2 2 1}}", "", tVal, false}, + {"out of range", "{{slice .SI 4 5}}", "", tVal, false}, + {"out of range", "{{slice .SI 2 2 5}}", "", tVal, false}, + {"len(s) < indexes < cap(s)", "{{slice .SICap 6 10}}", "[0 0 0 0]", tVal, true}, + {"len(s) < indexes < cap(s)", "{{slice .SICap 6 10 10}}", "[0 0 0 0]", tVal, true}, + {"indexes > cap(s)", "{{slice .SICap 10 11}}", "", tVal, false}, + {"indexes > cap(s)", "{{slice .SICap 6 10 11}}", "", tVal, false}, + {"array[:]", "{{slice .AI}}", "[3 4 5]", tVal, true}, + {"array[1:]", "{{slice .AI 1}}", "[4 5]", tVal, true}, + {"array[1:2]", "{{slice .AI 1 2}}", "[4]", tVal, true}, + {"string[:]", "{{slice .S}}", "xyz", tVal, true}, + {"string[0:1]", "{{slice .S 0 1}}", "x", tVal, true}, + {"string[1:]", "{{slice .S 1}}", "yz", tVal, true}, + {"string[1:2]", "{{slice .S 1 2}}", "y", tVal, true}, + {"out of range", "{{slice .S 1 5}}", "", tVal, false}, + {"3-index slice of string", "{{slice .S 1 2 2}}", "", tVal, false}, + {"slice of an interface field", "{{slice .Empty3 0 1}}", "[7]", tVal, true}, + + // Len. + {"slice", "{{len .SI}}", "3", tVal, true}, + {"map", "{{len .MSI }}", "3", tVal, true}, + {"len of int", "{{len 3}}", "", tVal, false}, + {"len of nothing", "{{len .Empty0}}", "", tVal, false}, + {"len of an interface field", "{{len .Empty3}}", "2", tVal, true}, + + // With. + {"with true", "{{with true}}{{.}}{{end}}", "true", tVal, true}, + {"with false", "{{with false}}{{.}}{{else}}FALSE{{end}}", "FALSE", tVal, true}, + {"with 1", "{{with 1}}{{.}}{{else}}ZERO{{end}}", "1", tVal, true}, + {"with 0", "{{with 0}}{{.}}{{else}}ZERO{{end}}", "ZERO", tVal, true}, + {"with 1.5", "{{with 1.5}}{{.}}{{else}}ZERO{{end}}", "1.5", tVal, true}, + {"with 0.0", "{{with .FloatZero}}{{.}}{{else}}ZERO{{end}}", "ZERO", tVal, true}, + {"with 1.5i", "{{with 1.5i}}{{.}}{{else}}ZERO{{end}}", "(0+1.5i)", tVal, true}, + {"with 0.0i", "{{with .ComplexZero}}{{.}}{{else}}ZERO{{end}}", "ZERO", tVal, true}, + {"with emptystring", "{{with ``}}{{.}}{{else}}EMPTY{{end}}", "EMPTY", tVal, true}, + {"with string", "{{with `notempty`}}{{.}}{{else}}EMPTY{{end}}", "notempty", tVal, true}, + {"with emptyslice", "{{with .SIEmpty}}{{.}}{{else}}EMPTY{{end}}", "EMPTY", tVal, true}, + {"with slice", "{{with .SI}}{{.}}{{else}}EMPTY{{end}}", "[3 4 5]", tVal, true}, + {"with emptymap", "{{with .MSIEmpty}}{{.}}{{else}}EMPTY{{end}}", "EMPTY", tVal, true}, + {"with map", "{{with .MSIone}}{{.}}{{else}}EMPTY{{end}}", "map[one:1]", tVal, true}, + {"with empty interface, struct field", "{{with .Empty4}}{{.V}}{{end}}", "UinEmpty", tVal, true}, + {"with $x int", "{{with $x := .I}}{{$x}}{{end}}", "17", tVal, true}, + {"with $x struct.U.V", "{{with $x := $}}{{$x.U.V}}{{end}}", "v", tVal, true}, + {"with variable and action", "{{with $x := $}}{{$y := $.U.V}}{{$y}}{{end}}", "v", tVal, true}, + {"with on typed nil interface value", "{{with .NonEmptyInterfaceTypedNil}}TRUE{{ end }}", "", tVal, true}, + + // Range. + {"range []int", "{{range .SI}}-{{.}}-{{end}}", "-3--4--5-", tVal, true}, + {"range empty no else", "{{range .SIEmpty}}-{{.}}-{{end}}", "", tVal, true}, + {"range []int else", "{{range .SI}}-{{.}}-{{else}}EMPTY{{end}}", "-3--4--5-", tVal, true}, + {"range empty else", "{{range .SIEmpty}}-{{.}}-{{else}}EMPTY{{end}}", "EMPTY", tVal, true}, + {"range []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.Clone() + if err != nil { + t.Errorf("%s: clone error: %s", test.name, err) + continue + } + tmpl, err = tmpl.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 + "|", "|", // 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>`, `\u003Chtml\u003E`}, + {`no = in attributes`, `no \u003D in attributes`}, + {`' does not become HTML entity`, `\u0026#x27; does not become HTML entity`}, + } + for _, tc := range testCases { + s := JSEscapeString(tc.in) + if s != tc.exp { + t.Errorf("JS escaping [%s] got [%s] want [%s]", tc.in, s, tc.exp) + } + } +} + +// A nice example: walk a binary tree. + +type Tree struct { + Val int + Left, Right *Tree +} + +// Use different delimiters to test Set.Delims. +// Also test the trimming of leading and trailing spaces. +const treeTemplate = ` + (- define "tree" -) + [ + (- .Val -) + (- with .Left -) + (template "tree" . -) + (- end -) + (- with .Right -) + (- template "tree" . -) + (- end -) + ] + (- end -) +` + +func TestTree(t *testing.T) { + var tree = &Tree{ + 1, + &Tree{ + 2, &Tree{ + 3, + &Tree{ + 4, nil, nil, + }, + nil, + }, + &Tree{ + 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() // TODO: crashes + // new(Template).Parse("") // TODO: crashes + // new(Template).New("abc").Parse("") // TODO: crashes + // new(Template).Execute(nil, nil) // TODO: crashes; returns an error (but does not crash) + // new(Template).ExecuteTemplate(nil, "XXX", nil) // TODO: crashes; 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" is an incomplete or empty template` // NOTE: text/template has extra "empty: " in message + if got != want { + t.Errorf("expected error %s got %s", want, got) + } + + // Add a non-empty template to check that the error is helpful. + tmpl = New("empty") + 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() + 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>" // NOTE: not in html/template, get empty string + err = tmpl.Execute(&b, data) + if err != nil { + t.Fatal(err) + } + want := "99 " + 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) + } + 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: 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(io.Discard, 0) + if err == nil { + t.Fatal("expected error; got none") + } + eerr, ok := err.(template.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(io.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(io.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) { + t.Skip("broken in html/template") + + // 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") + } +} + +// Issue 39807. There was a race applying escapeTemplate. + +const raceText = ` +{{- define "jstempl" -}} +var v = "v"; +{{- end -}} +<script type="application/javascript"> +{{ template "jstempl" $ }} +</script> +` + +func TestEscapeRace(t *testing.T) { + tmpl := New("") + _, err := tmpl.New("templ.html").Parse(raceText) + if err != nil { + t.Fatal(err) + } + const count = 20 + for i := 0; i < count; i++ { + _, err := tmpl.New(fmt.Sprintf("x%d.html", i)).Parse(`{{ template "templ.html" .}}`) + if err != nil { + t.Fatal(err) + } + } + + var wg sync.WaitGroup + for i := 0; i < 10; i++ { + wg.Add(1) + go func() { + defer wg.Done() + for j := 0; j < count; j++ { + sub := tmpl.Lookup(fmt.Sprintf("x%d.html", j)) + if err := sub.Execute(io.Discard, nil); err != nil { + t.Error(err) + } + } + }() + } + wg.Wait() +} + +func TestRecursiveExecute(t *testing.T) { + tmpl := New("") + + recur := func() (HTML, error) { + var sb strings.Builder + if err := tmpl.ExecuteTemplate(&sb, "subroutine", nil); err != nil { + t.Fatal(err) + } + return HTML(sb.String()), nil + } + + m := FuncMap{ + "recur": recur, + } + + top, err := tmpl.New("x.html").Funcs(m).Parse(`{{recur}}`) + if err != nil { + t.Fatal(err) + } + _, err = tmpl.New("subroutine").Parse(`<a href="/x?p={{"'a<b'"}}">`) + if err != nil { + t.Fatal(err) + } + if err := top.Execute(io.Discard, nil); err != nil { + t.Fatal(err) + } +} + +// recursiveInvoker is for TestRecursiveExecuteViaMethod. +type recursiveInvoker struct { + t *testing.T + tmpl *Template +} + +func (r *recursiveInvoker) Recur() (string, error) { + var sb strings.Builder + if err := r.tmpl.ExecuteTemplate(&sb, "subroutine", nil); err != nil { + r.t.Fatal(err) + } + return sb.String(), nil +} + +func TestRecursiveExecuteViaMethod(t *testing.T) { + tmpl := New("") + top, err := tmpl.New("x.html").Parse(`{{.Recur}}`) + if err != nil { + t.Fatal(err) + } + _, err = tmpl.New("subroutine").Parse(`<a href="/x?p={{"'a<b'"}}">`) + if err != nil { + t.Fatal(err) + } + r := &recursiveInvoker{ + t: t, + tmpl: tmpl, + } + if err := top.Execute(io.Discard, r); err != nil { + t.Fatal(err) + } +} + +// Issue 43295. +func TestTemplateFuncsAfterClone(t *testing.T) { + s := `{{ f . }}` + want := "test" + orig := New("orig").Funcs(map[string]interface{}{ + "f": func(in string) string { + return in + }, + }).New("child") + + overviewTmpl := Must(Must(orig.Clone()).Parse(s)) + var out strings.Builder + if err := overviewTmpl.Execute(&out, want); err != nil { + t.Fatal(err) + } + if got := out.String(); got != want { + t.Fatalf("got %q; want %q", got, want) + } +} |