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+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package template
+
+import (
+ "bytes"
+ "errors"
+ "flag"
+ "fmt"
+ "io"
+ "reflect"
+ "strings"
+ "sync"
+ "testing"
+)
+
+var debug = flag.Bool("debug", false, "show the errors produced by the tests")
+
+// T has lots of interesting pieces to use to test execution.
+type T struct {
+ // Basics
+ True bool
+ I int
+ U16 uint16
+ X, S string
+ FloatZero float64
+ ComplexZero complex128
+ // Nested structs.
+ U *U
+ // Struct with String method.
+ V0 V
+ V1, V2 *V
+ // Struct with Error method.
+ W0 W
+ W1, W2 *W
+ // Slices
+ SI []int
+ SICap []int
+ SIEmpty []int
+ SB []bool
+ // Arrays
+ AI [3]int
+ // Maps
+ MSI map[string]int
+ MSIone map[string]int // one element, for deterministic output
+ MSIEmpty map[string]int
+ MXI map[any]int
+ MII map[int]int
+ MI32S map[int32]string
+ MI64S map[int64]string
+ MUI32S map[uint32]string
+ MUI64S map[uint64]string
+ MI8S map[int8]string
+ MUI8S map[uint8]string
+ SMSI []map[string]int
+ // Empty interfaces; used to see if we can dig inside one.
+ Empty0 any // nil
+ Empty1 any
+ Empty2 any
+ Empty3 any
+ Empty4 any
+ // Non-empty interfaces.
+ NonEmptyInterface I
+ NonEmptyInterfacePtS *I
+ NonEmptyInterfaceNil I
+ NonEmptyInterfaceTypedNil I
+ // Stringer.
+ Str fmt.Stringer
+ Err error
+ // Pointers
+ PI *int
+ PS *string
+ PSI *[]int
+ NIL *int
+ // Function (not method)
+ BinaryFunc func(string, string) string
+ VariadicFunc func(...string) string
+ VariadicFuncInt func(int, ...string) string
+ NilOKFunc func(*int) bool
+ ErrFunc func() (string, error)
+ PanicFunc func() string
+ // Template to test evaluation of templates.
+ Tmpl *Template
+ // Unexported field; cannot be accessed by template.
+ unexported int
+}
+
+type S []string
+
+func (S) Method0() string {
+ return "M0"
+}
+
+type U struct {
+ V string
+}
+
+type V struct {
+ j int
+}
+
+func (v *V) String() string {
+ if v == nil {
+ return "nilV"
+ }
+ return fmt.Sprintf("<%d>", v.j)
+}
+
+type W struct {
+ k int
+}
+
+func (w *W) Error() string {
+ if w == nil {
+ return "nilW"
+ }
+ return fmt.Sprintf("[%d]", w.k)
+}
+
+var siVal = I(S{"a", "b"})
+
+var tVal = &T{
+ True: true,
+ I: 17,
+ U16: 16,
+ X: "x",
+ S: "xyz",
+ U: &U{"v"},
+ V0: V{6666},
+ V1: &V{7777}, // leave V2 as nil
+ W0: W{888},
+ W1: &W{999}, // leave W2 as nil
+ SI: []int{3, 4, 5},
+ SICap: make([]int, 5, 10),
+ AI: [3]int{3, 4, 5},
+ SB: []bool{true, false},
+ MSI: map[string]int{"one": 1, "two": 2, "three": 3},
+ MSIone: map[string]int{"one": 1},
+ MXI: map[any]int{"one": 1},
+ MII: map[int]int{1: 1},
+ MI32S: map[int32]string{1: "one", 2: "two"},
+ MI64S: map[int64]string{2: "i642", 3: "i643"},
+ MUI32S: map[uint32]string{2: "u322", 3: "u323"},
+ MUI64S: map[uint64]string{2: "ui642", 3: "ui643"},
+ MI8S: map[int8]string{2: "i82", 3: "i83"},
+ MUI8S: map[uint8]string{2: "u82", 3: "u83"},
+ SMSI: []map[string]int{
+ {"one": 1, "two": 2},
+ {"eleven": 11, "twelve": 12},
+ },
+ Empty1: 3,
+ Empty2: "empty2",
+ Empty3: []int{7, 8},
+ Empty4: &U{"UinEmpty"},
+ NonEmptyInterface: &T{X: "x"},
+ NonEmptyInterfacePtS: &siVal,
+ NonEmptyInterfaceTypedNil: (*T)(nil),
+ Str: bytes.NewBuffer([]byte("foozle")),
+ Err: errors.New("erroozle"),
+ PI: newInt(23),
+ PS: newString("a string"),
+ PSI: newIntSlice(21, 22, 23),
+ BinaryFunc: func(a, b string) string { return fmt.Sprintf("[%s=%s]", a, b) },
+ VariadicFunc: func(s ...string) string { return fmt.Sprint("<", strings.Join(s, "+"), ">") },
+ VariadicFuncInt: func(a int, s ...string) string { return fmt.Sprint(a, "=<", strings.Join(s, "+"), ">") },
+ NilOKFunc: func(s *int) bool { return s == nil },
+ ErrFunc: func() (string, error) { return "bla", nil },
+ PanicFunc: func() string { panic("test panic") },
+ Tmpl: Must(New("x").Parse("test template")), // "x" is the value of .X
+}
+
+var tSliceOfNil = []*T{nil}
+
+// A non-empty interface.
+type I interface {
+ Method0() string
+}
+
+var iVal I = tVal
+
+// Helpers for creation.
+func newInt(n int) *int {
+ return &n
+}
+
+func newString(s string) *string {
+ return &s
+}
+
+func newIntSlice(n ...int) *[]int {
+ p := new([]int)
+ *p = make([]int, len(n))
+ copy(*p, n)
+ return p
+}
+
+// Simple methods with and without arguments.
+func (t *T) Method0() string {
+ return "M0"
+}
+
+func (t *T) Method1(a int) int {
+ return a
+}
+
+func (t *T) Method2(a uint16, b string) string {
+ return fmt.Sprintf("Method2: %d %s", a, b)
+}
+
+func (t *T) Method3(v any) string {
+ return fmt.Sprintf("Method3: %v", v)
+}
+
+func (t *T) Copy() *T {
+ n := new(T)
+ *n = *t
+ return n
+}
+
+func (t *T) MAdd(a int, b []int) []int {
+ v := make([]int, len(b))
+ for i, x := range b {
+ v[i] = x + a
+ }
+ return v
+}
+
+var myError = errors.New("my error")
+
+// MyError returns a value and an error according to its argument.
+func (t *T) MyError(error bool) (bool, error) {
+ if error {
+ return true, myError
+ }
+ return false, nil
+}
+
+// A few methods to test chaining.
+func (t *T) GetU() *U {
+ return t.U
+}
+
+func (u *U) TrueFalse(b bool) string {
+ if b {
+ return "true"
+ }
+ return ""
+}
+
+func typeOf(arg any) string {
+ return fmt.Sprintf("%T", arg)
+}
+
+type execTest struct {
+ name string
+ input string
+ output string
+ data any
+ ok bool
+}
+
+// bigInt and bigUint are hex string representing numbers either side
+// of the max int boundary.
+// We do it this way so the test doesn't depend on ints being 32 bits.
+var (
+ bigInt = fmt.Sprintf("0x%x", int(1<<uint(reflect.TypeOf(0).Bits()-1)-1))
+ bigUint = fmt.Sprintf("0x%x", uint(1<<uint(reflect.TypeOf(0).Bits()-1)))
+)
+
+var execTests = []execTest{
+ // Trivial cases.
+ {"empty", "", "", nil, true},
+ {"text", "some text", "some text", nil, true},
+ {"nil action", "{{nil}}", "", nil, false},
+
+ // Ideal constants.
+ {"ideal int", "{{typeOf 3}}", "int", 0, true},
+ {"ideal float", "{{typeOf 1.0}}", "float64", 0, true},
+ {"ideal exp float", "{{typeOf 1e1}}", "float64", 0, true},
+ {"ideal complex", "{{typeOf 1i}}", "complex128", 0, true},
+ {"ideal int", "{{typeOf " + bigInt + "}}", "int", 0, true},
+ {"ideal too big", "{{typeOf " + bigUint + "}}", "", 0, false},
+ {"ideal nil without type", "{{nil}}", "", 0, false},
+
+ // Fields of structs.
+ {".X", "-{{.X}}-", "-x-", tVal, true},
+ {".U.V", "-{{.U.V}}-", "-v-", tVal, true},
+ {".unexported", "{{.unexported}}", "", tVal, false},
+
+ // Fields on maps.
+ {"map .one", "{{.MSI.one}}", "1", tVal, true},
+ {"map .two", "{{.MSI.two}}", "2", tVal, true},
+ {"map .NO", "{{.MSI.NO}}", "<no value>", tVal, true},
+ {"map .one interface", "{{.MXI.one}}", "1", tVal, true},
+ {"map .WRONG args", "{{.MSI.one 1}}", "", tVal, false},
+ {"map .WRONG type", "{{.MII.one}}", "", tVal, false},
+
+ // Dots of all kinds to test basic evaluation.
+ {"dot int", "<{{.}}>", "<13>", 13, true},
+ {"dot uint", "<{{.}}>", "<14>", uint(14), true},
+ {"dot float", "<{{.}}>", "<15.1>", 15.1, true},
+ {"dot bool", "<{{.}}>", "<true>", true, true},
+ {"dot complex", "<{{.}}>", "<(16.2-17i)>", 16.2 - 17i, true},
+ {"dot string", "<{{.}}>", "<hello>", "hello", true},
+ {"dot slice", "<{{.}}>", "<[-1 -2 -3]>", []int{-1, -2, -3}, true},
+ {"dot map", "<{{.}}>", "<map[two:22]>", map[string]int{"two": 22}, true},
+ {"dot struct", "<{{.}}>", "<{7 seven}>", struct {
+ a int
+ b string
+ }{7, "seven"}, true},
+
+ // Variables.
+ {"$ int", "{{$}}", "123", 123, true},
+ {"$.I", "{{$.I}}", "17", tVal, true},
+ {"$.U.V", "{{$.U.V}}", "v", tVal, true},
+ {"declare in action", "{{$x := $.U.V}}{{$x}}", "v", tVal, true},
+ {"simple assignment", "{{$x := 2}}{{$x = 3}}{{$x}}", "3", tVal, true},
+ {"nested assignment",
+ "{{$x := 2}}{{if true}}{{$x = 3}}{{end}}{{$x}}",
+ "3", tVal, true},
+ {"nested assignment changes the last declaration",
+ "{{$x := 1}}{{if true}}{{$x := 2}}{{if true}}{{$x = 3}}{{end}}{{end}}{{$x}}",
+ "1", tVal, true},
+
+ // Type with String method.
+ {"V{6666}.String()", "-{{.V0}}-", "-<6666>-", tVal, true},
+ {"&V{7777}.String()", "-{{.V1}}-", "-<7777>-", tVal, true},
+ {"(*V)(nil).String()", "-{{.V2}}-", "-nilV-", tVal, true},
+
+ // Type with Error method.
+ {"W{888}.Error()", "-{{.W0}}-", "-[888]-", tVal, true},
+ {"&W{999}.Error()", "-{{.W1}}-", "-[999]-", tVal, true},
+ {"(*W)(nil).Error()", "-{{.W2}}-", "-nilW-", tVal, true},
+
+ // Pointers.
+ {"*int", "{{.PI}}", "23", tVal, true},
+ {"*string", "{{.PS}}", "a string", tVal, true},
+ {"*[]int", "{{.PSI}}", "[21 22 23]", tVal, true},
+ {"*[]int[1]", "{{index .PSI 1}}", "22", tVal, true},
+ {"NIL", "{{.NIL}}", "<nil>", tVal, true},
+
+ // Empty interfaces holding values.
+ {"empty nil", "{{.Empty0}}", "<no value>", tVal, true},
+ {"empty with int", "{{.Empty1}}", "3", tVal, true},
+ {"empty with string", "{{.Empty2}}", "empty2", tVal, true},
+ {"empty with slice", "{{.Empty3}}", "[7 8]", tVal, true},
+ {"empty with struct", "{{.Empty4}}", "{UinEmpty}", tVal, true},
+ {"empty with struct, field", "{{.Empty4.V}}", "UinEmpty", tVal, true},
+
+ // Edge cases with <no value> with an interface value
+ {"field on interface", "{{.foo}}", "<no value>", nil, true},
+ {"field on parenthesized interface", "{{(.).foo}}", "<no value>", nil, true},
+
+ // Issue 31810: Parenthesized first element of pipeline with arguments.
+ // See also TestIssue31810.
+ {"unparenthesized non-function", "{{1 2}}", "", nil, false},
+ {"parenthesized non-function", "{{(1) 2}}", "", nil, false},
+ {"parenthesized non-function with no args", "{{(1)}}", "1", nil, true}, // This is fine.
+
+ // Method calls.
+ {".Method0", "-{{.Method0}}-", "-M0-", tVal, true},
+ {".Method1(1234)", "-{{.Method1 1234}}-", "-1234-", tVal, true},
+ {".Method1(.I)", "-{{.Method1 .I}}-", "-17-", tVal, true},
+ {".Method2(3, .X)", "-{{.Method2 3 .X}}-", "-Method2: 3 x-", tVal, true},
+ {".Method2(.U16, `str`)", "-{{.Method2 .U16 `str`}}-", "-Method2: 16 str-", tVal, true},
+ {".Method2(.U16, $x)", "{{if $x := .X}}-{{.Method2 .U16 $x}}{{end}}-", "-Method2: 16 x-", tVal, true},
+ {".Method3(nil constant)", "-{{.Method3 nil}}-", "-Method3: <nil>-", tVal, true},
+ {".Method3(nil value)", "-{{.Method3 .MXI.unset}}-", "-Method3: <nil>-", tVal, true},
+ {"method on var", "{{if $x := .}}-{{$x.Method2 .U16 $x.X}}{{end}}-", "-Method2: 16 x-", tVal, true},
+ {"method on chained var",
+ "{{range .MSIone}}{{if $.U.TrueFalse $.True}}{{$.U.TrueFalse $.True}}{{else}}WRONG{{end}}{{end}}",
+ "true", tVal, true},
+ {"chained method",
+ "{{range .MSIone}}{{if $.GetU.TrueFalse $.True}}{{$.U.TrueFalse $.True}}{{else}}WRONG{{end}}{{end}}",
+ "true", tVal, true},
+ {"chained method on variable",
+ "{{with $x := .}}{{with .SI}}{{$.GetU.TrueFalse $.True}}{{end}}{{end}}",
+ "true", tVal, true},
+ {".NilOKFunc not nil", "{{call .NilOKFunc .PI}}", "false", tVal, true},
+ {".NilOKFunc nil", "{{call .NilOKFunc nil}}", "true", tVal, true},
+ {"method on nil value from slice", "-{{range .}}{{.Method1 1234}}{{end}}-", "-1234-", tSliceOfNil, true},
+ {"method on typed nil interface value", "{{.NonEmptyInterfaceTypedNil.Method0}}", "M0", tVal, true},
+
+ // Function call builtin.
+ {".BinaryFunc", "{{call .BinaryFunc `1` `2`}}", "[1=2]", tVal, true},
+ {".VariadicFunc0", "{{call .VariadicFunc}}", "<>", tVal, true},
+ {".VariadicFunc2", "{{call .VariadicFunc `he` `llo`}}", "<he+llo>", tVal, true},
+ {".VariadicFuncInt", "{{call .VariadicFuncInt 33 `he` `llo`}}", "33=<he+llo>", tVal, true},
+ {"if .BinaryFunc call", "{{ if .BinaryFunc}}{{call .BinaryFunc `1` `2`}}{{end}}", "[1=2]", tVal, true},
+ {"if not .BinaryFunc call", "{{ if not .BinaryFunc}}{{call .BinaryFunc `1` `2`}}{{else}}No{{end}}", "No", tVal, true},
+ {"Interface Call", `{{stringer .S}}`, "foozle", map[string]any{"S": bytes.NewBufferString("foozle")}, true},
+ {".ErrFunc", "{{call .ErrFunc}}", "bla", tVal, true},
+ {"call nil", "{{call nil}}", "", tVal, false},
+
+ // Erroneous function calls (check args).
+ {".BinaryFuncTooFew", "{{call .BinaryFunc `1`}}", "", tVal, false},
+ {".BinaryFuncTooMany", "{{call .BinaryFunc `1` `2` `3`}}", "", tVal, false},
+ {".BinaryFuncBad0", "{{call .BinaryFunc 1 3}}", "", tVal, false},
+ {".BinaryFuncBad1", "{{call .BinaryFunc `1` 3}}", "", tVal, false},
+ {".VariadicFuncBad0", "{{call .VariadicFunc 3}}", "", tVal, false},
+ {".VariadicFuncIntBad0", "{{call .VariadicFuncInt}}", "", tVal, false},
+ {".VariadicFuncIntBad`", "{{call .VariadicFuncInt `x`}}", "", tVal, false},
+ {".VariadicFuncNilBad", "{{call .VariadicFunc nil}}", "", tVal, false},
+
+ // Pipelines.
+ {"pipeline", "-{{.Method0 | .Method2 .U16}}-", "-Method2: 16 M0-", tVal, true},
+ {"pipeline func", "-{{call .VariadicFunc `llo` | call .VariadicFunc `he` }}-", "-<he+<llo>>-", tVal, true},
+
+ // Nil values aren't missing arguments.
+ {"nil pipeline", "{{ .Empty0 | call .NilOKFunc }}", "true", tVal, true},
+ {"nil call arg", "{{ call .NilOKFunc .Empty0 }}", "true", tVal, true},
+ {"bad nil pipeline", "{{ .Empty0 | .VariadicFunc }}", "", tVal, false},
+
+ // Parenthesized expressions
+ {"parens in pipeline", "{{printf `%d %d %d` (1) (2 | add 3) (add 4 (add 5 6))}}", "1 5 15", tVal, true},
+
+ // Parenthesized expressions with field accesses
+ {"parens: $ in paren", "{{($).X}}", "x", tVal, true},
+ {"parens: $.GetU in paren", "{{($.GetU).V}}", "v", tVal, true},
+ {"parens: $ in paren in pipe", "{{($ | echo).X}}", "x", tVal, true},
+ {"parens: spaces and args", `{{(makemap "up" "down" "left" "right").left}}`, "right", tVal, true},
+
+ // If.
+ {"if true", "{{if true}}TRUE{{end}}", "TRUE", tVal, true},
+ {"if false", "{{if false}}TRUE{{else}}FALSE{{end}}", "FALSE", tVal, true},
+ {"if nil", "{{if nil}}TRUE{{end}}", "", tVal, false},
+ {"if on typed nil interface value", "{{if .NonEmptyInterfaceTypedNil}}TRUE{{ end }}", "", tVal, true},
+ {"if 1", "{{if 1}}NON-ZERO{{else}}ZERO{{end}}", "NON-ZERO", tVal, true},
+ {"if 0", "{{if 0}}NON-ZERO{{else}}ZERO{{end}}", "ZERO", tVal, true},
+ {"if 1.5", "{{if 1.5}}NON-ZERO{{else}}ZERO{{end}}", "NON-ZERO", tVal, true},
+ {"if 0.0", "{{if .FloatZero}}NON-ZERO{{else}}ZERO{{end}}", "ZERO", tVal, true},
+ {"if 1.5i", "{{if 1.5i}}NON-ZERO{{else}}ZERO{{end}}", "NON-ZERO", tVal, true},
+ {"if 0.0i", "{{if .ComplexZero}}NON-ZERO{{else}}ZERO{{end}}", "ZERO", tVal, true},
+ {"if emptystring", "{{if ``}}NON-EMPTY{{else}}EMPTY{{end}}", "EMPTY", tVal, true},
+ {"if string", "{{if `notempty`}}NON-EMPTY{{else}}EMPTY{{end}}", "NON-EMPTY", tVal, true},
+ {"if emptyslice", "{{if .SIEmpty}}NON-EMPTY{{else}}EMPTY{{end}}", "EMPTY", tVal, true},
+ {"if slice", "{{if .SI}}NON-EMPTY{{else}}EMPTY{{end}}", "NON-EMPTY", tVal, true},
+ {"if emptymap", "{{if .MSIEmpty}}NON-EMPTY{{else}}EMPTY{{end}}", "EMPTY", tVal, true},
+ {"if map", "{{if .MSI}}NON-EMPTY{{else}}EMPTY{{end}}", "NON-EMPTY", tVal, true},
+ {"if map unset", "{{if .MXI.none}}NON-ZERO{{else}}ZERO{{end}}", "ZERO", tVal, true},
+ {"if map not unset", "{{if not .MXI.none}}ZERO{{else}}NON-ZERO{{end}}", "ZERO", tVal, true},
+ {"if $x with $y int", "{{if $x := true}}{{with $y := .I}}{{$x}},{{$y}}{{end}}{{end}}", "true,17", tVal, true},
+ {"if $x with $x int", "{{if $x := true}}{{with $x := .I}}{{$x}},{{end}}{{$x}}{{end}}", "17,true", tVal, true},
+ {"if else if", "{{if false}}FALSE{{else if true}}TRUE{{end}}", "TRUE", tVal, true},
+ {"if else chain", "{{if eq 1 3}}1{{else if eq 2 3}}2{{else if eq 3 3}}3{{end}}", "3", tVal, true},
+
+ // Print etc.
+ {"print", `{{print "hello, print"}}`, "hello, print", tVal, true},
+ {"print 123", `{{print 1 2 3}}`, "1 2 3", tVal, true},
+ {"print nil", `{{print nil}}`, "<nil>", tVal, true},
+ {"println", `{{println 1 2 3}}`, "1 2 3\n", tVal, true},
+ {"printf int", `{{printf "%04x" 127}}`, "007f", tVal, true},
+ {"printf float", `{{printf "%g" 3.5}}`, "3.5", tVal, true},
+ {"printf complex", `{{printf "%g" 1+7i}}`, "(1+7i)", tVal, true},
+ {"printf string", `{{printf "%s" "hello"}}`, "hello", tVal, true},
+ {"printf function", `{{printf "%#q" zeroArgs}}`, "`zeroArgs`", tVal, true},
+ {"printf field", `{{printf "%s" .U.V}}`, "v", tVal, true},
+ {"printf method", `{{printf "%s" .Method0}}`, "M0", tVal, true},
+ {"printf dot", `{{with .I}}{{printf "%d" .}}{{end}}`, "17", tVal, true},
+ {"printf var", `{{with $x := .I}}{{printf "%d" $x}}{{end}}`, "17", tVal, true},
+ {"printf lots", `{{printf "%d %s %g %s" 127 "hello" 7-3i .Method0}}`, "127 hello (7-3i) M0", tVal, true},
+
+ // HTML.
+ {"html", `{{html "<script>alert(\"XSS\");</script>"}}`,
+ "&lt;script&gt;alert(&#34;XSS&#34;);&lt;/script&gt;", nil, true},
+ {"html pipeline", `{{printf "<script>alert(\"XSS\");</script>" | html}}`,
+ "&lt;script&gt;alert(&#34;XSS&#34;);&lt;/script&gt;", nil, true},
+ {"html", `{{html .PS}}`, "a string", tVal, true},
+ {"html typed nil", `{{html .NIL}}`, "&lt;nil&gt;", tVal, true},
+ {"html untyped nil", `{{html .Empty0}}`, "&lt;no value&gt;", tVal, true},
+
+ // JavaScript.
+ {"js", `{{js .}}`, `It\'d be nice.`, `It'd be nice.`, true},
+
+ // URL query.
+ {"urlquery", `{{"http://www.example.org/"|urlquery}}`, "http%3A%2F%2Fwww.example.org%2F", nil, true},
+
+ // Booleans
+ {"not", "{{not true}} {{not false}}", "false true", nil, true},
+ {"and", "{{and false 0}} {{and 1 0}} {{and 0 true}} {{and 1 1}}", "false 0 0 1", nil, true},
+ {"or", "{{or 0 0}} {{or 1 0}} {{or 0 true}} {{or 1 1}}", "0 1 true 1", nil, true},
+ {"or short-circuit", "{{or 0 1 (die)}}", "1", nil, true},
+ {"and short-circuit", "{{and 1 0 (die)}}", "0", nil, true},
+ {"or short-circuit2", "{{or 0 0 (die)}}", "", nil, false},
+ {"and short-circuit2", "{{and 1 1 (die)}}", "", nil, false},
+ {"and pipe-true", "{{1 | and 1}}", "1", nil, true},
+ {"and pipe-false", "{{0 | and 1}}", "0", nil, true},
+ {"or pipe-true", "{{1 | or 0}}", "1", nil, true},
+ {"or pipe-false", "{{0 | or 0}}", "0", nil, true},
+ {"and undef", "{{and 1 .Unknown}}", "<no value>", nil, true},
+ {"or undef", "{{or 0 .Unknown}}", "<no value>", nil, true},
+ {"boolean if", "{{if and true 1 `hi`}}TRUE{{else}}FALSE{{end}}", "TRUE", tVal, true},
+ {"boolean if not", "{{if and true 1 `hi` | not}}TRUE{{else}}FALSE{{end}}", "FALSE", nil, true},
+ {"boolean if pipe", "{{if true | not | and 1}}TRUE{{else}}FALSE{{end}}", "FALSE", nil, true},
+
+ // Indexing.
+ {"slice[0]", "{{index .SI 0}}", "3", tVal, true},
+ {"slice[1]", "{{index .SI 1}}", "4", tVal, true},
+ {"slice[HUGE]", "{{index .SI 10}}", "", tVal, false},
+ {"slice[WRONG]", "{{index .SI `hello`}}", "", tVal, false},
+ {"slice[nil]", "{{index .SI nil}}", "", tVal, false},
+ {"map[one]", "{{index .MSI `one`}}", "1", tVal, true},
+ {"map[two]", "{{index .MSI `two`}}", "2", tVal, true},
+ {"map[NO]", "{{index .MSI `XXX`}}", "0", tVal, true},
+ {"map[nil]", "{{index .MSI nil}}", "", tVal, false},
+ {"map[``]", "{{index .MSI ``}}", "0", tVal, true},
+ {"map[WRONG]", "{{index .MSI 10}}", "", tVal, false},
+ {"double index", "{{index .SMSI 1 `eleven`}}", "11", tVal, true},
+ {"nil[1]", "{{index nil 1}}", "", tVal, false},
+ {"map MI64S", "{{index .MI64S 2}}", "i642", tVal, true},
+ {"map MI32S", "{{index .MI32S 2}}", "two", tVal, true},
+ {"map MUI64S", "{{index .MUI64S 3}}", "ui643", tVal, true},
+ {"map MI8S", "{{index .MI8S 3}}", "i83", tVal, true},
+ {"map MUI8S", "{{index .MUI8S 2}}", "u82", tVal, true},
+ {"index of an interface field", "{{index .Empty3 0}}", "7", tVal, true},
+
+ // Slicing.
+ {"slice[:]", "{{slice .SI}}", "[3 4 5]", tVal, true},
+ {"slice[1:]", "{{slice .SI 1}}", "[4 5]", tVal, true},
+ {"slice[1:2]", "{{slice .SI 1 2}}", "[4]", tVal, true},
+ {"slice[-1:]", "{{slice .SI -1}}", "", tVal, false},
+ {"slice[1:-2]", "{{slice .SI 1 -2}}", "", tVal, false},
+ {"slice[1:2:-1]", "{{slice .SI 1 2 -1}}", "", tVal, false},
+ {"slice[2:1]", "{{slice .SI 2 1}}", "", tVal, false},
+ {"slice[2:2:1]", "{{slice .SI 2 2 1}}", "", tVal, false},
+ {"out of range", "{{slice .SI 4 5}}", "", tVal, false},
+ {"out of range", "{{slice .SI 2 2 5}}", "", tVal, false},
+ {"len(s) < indexes < cap(s)", "{{slice .SICap 6 10}}", "[0 0 0 0]", tVal, true},
+ {"len(s) < indexes < cap(s)", "{{slice .SICap 6 10 10}}", "[0 0 0 0]", tVal, true},
+ {"indexes > cap(s)", "{{slice .SICap 10 11}}", "", tVal, false},
+ {"indexes > cap(s)", "{{slice .SICap 6 10 11}}", "", tVal, false},
+ {"array[:]", "{{slice .AI}}", "[3 4 5]", tVal, true},
+ {"array[1:]", "{{slice .AI 1}}", "[4 5]", tVal, true},
+ {"array[1:2]", "{{slice .AI 1 2}}", "[4]", tVal, true},
+ {"string[:]", "{{slice .S}}", "xyz", tVal, true},
+ {"string[0:1]", "{{slice .S 0 1}}", "x", tVal, true},
+ {"string[1:]", "{{slice .S 1}}", "yz", tVal, true},
+ {"string[1:2]", "{{slice .S 1 2}}", "y", tVal, true},
+ {"out of range", "{{slice .S 1 5}}", "", tVal, false},
+ {"3-index slice of string", "{{slice .S 1 2 2}}", "", tVal, false},
+ {"slice of an interface field", "{{slice .Empty3 0 1}}", "[7]", tVal, true},
+
+ // Len.
+ {"slice", "{{len .SI}}", "3", tVal, true},
+ {"map", "{{len .MSI }}", "3", tVal, true},
+ {"len of int", "{{len 3}}", "", tVal, false},
+ {"len of nothing", "{{len .Empty0}}", "", tVal, false},
+ {"len of an interface field", "{{len .Empty3}}", "2", tVal, true},
+
+ // With.
+ {"with true", "{{with true}}{{.}}{{end}}", "true", tVal, true},
+ {"with false", "{{with false}}{{.}}{{else}}FALSE{{end}}", "FALSE", tVal, true},
+ {"with 1", "{{with 1}}{{.}}{{else}}ZERO{{end}}", "1", tVal, true},
+ {"with 0", "{{with 0}}{{.}}{{else}}ZERO{{end}}", "ZERO", tVal, true},
+ {"with 1.5", "{{with 1.5}}{{.}}{{else}}ZERO{{end}}", "1.5", tVal, true},
+ {"with 0.0", "{{with .FloatZero}}{{.}}{{else}}ZERO{{end}}", "ZERO", tVal, true},
+ {"with 1.5i", "{{with 1.5i}}{{.}}{{else}}ZERO{{end}}", "(0+1.5i)", tVal, true},
+ {"with 0.0i", "{{with .ComplexZero}}{{.}}{{else}}ZERO{{end}}", "ZERO", tVal, true},
+ {"with emptystring", "{{with ``}}{{.}}{{else}}EMPTY{{end}}", "EMPTY", tVal, true},
+ {"with string", "{{with `notempty`}}{{.}}{{else}}EMPTY{{end}}", "notempty", tVal, true},
+ {"with emptyslice", "{{with .SIEmpty}}{{.}}{{else}}EMPTY{{end}}", "EMPTY", tVal, true},
+ {"with slice", "{{with .SI}}{{.}}{{else}}EMPTY{{end}}", "[3 4 5]", tVal, true},
+ {"with emptymap", "{{with .MSIEmpty}}{{.}}{{else}}EMPTY{{end}}", "EMPTY", tVal, true},
+ {"with map", "{{with .MSIone}}{{.}}{{else}}EMPTY{{end}}", "map[one:1]", tVal, true},
+ {"with empty interface, struct field", "{{with .Empty4}}{{.V}}{{end}}", "UinEmpty", tVal, true},
+ {"with $x int", "{{with $x := .I}}{{$x}}{{end}}", "17", tVal, true},
+ {"with $x struct.U.V", "{{with $x := $}}{{$x.U.V}}{{end}}", "v", tVal, true},
+ {"with variable and action", "{{with $x := $}}{{$y := $.U.V}}{{$y}}{{end}}", "v", tVal, true},
+ {"with on typed nil interface value", "{{with .NonEmptyInterfaceTypedNil}}TRUE{{ end }}", "", tVal, true},
+
+ // Range.
+ {"range []int", "{{range .SI}}-{{.}}-{{end}}", "-3--4--5-", tVal, true},
+ {"range empty no else", "{{range .SIEmpty}}-{{.}}-{{end}}", "", tVal, true},
+ {"range []int else", "{{range .SI}}-{{.}}-{{else}}EMPTY{{end}}", "-3--4--5-", tVal, true},
+ {"range empty else", "{{range .SIEmpty}}-{{.}}-{{else}}EMPTY{{end}}", "EMPTY", tVal, true},
+ {"range []int break else", "{{range .SI}}-{{.}}-{{break}}NOTREACHED{{else}}EMPTY{{end}}", "-3-", tVal, true},
+ {"range []int continue else", "{{range .SI}}-{{.}}-{{continue}}NOTREACHED{{else}}EMPTY{{end}}", "-3--4--5-", tVal, true},
+ {"range []bool", "{{range .SB}}-{{.}}-{{end}}", "-true--false-", tVal, true},
+ {"range []int method", "{{range .SI | .MAdd .I}}-{{.}}-{{end}}", "-20--21--22-", tVal, true},
+ {"range map", "{{range .MSI}}-{{.}}-{{end}}", "-1--3--2-", tVal, true},
+ {"range empty map no else", "{{range .MSIEmpty}}-{{.}}-{{end}}", "", tVal, true},
+ {"range map else", "{{range .MSI}}-{{.}}-{{else}}EMPTY{{end}}", "-1--3--2-", tVal, true},
+ {"range empty map else", "{{range .MSIEmpty}}-{{.}}-{{else}}EMPTY{{end}}", "EMPTY", tVal, true},
+ {"range empty interface", "{{range .Empty3}}-{{.}}-{{else}}EMPTY{{end}}", "-7--8-", tVal, true},
+ {"range empty nil", "{{range .Empty0}}-{{.}}-{{end}}", "", tVal, true},
+ {"range $x SI", "{{range $x := .SI}}<{{$x}}>{{end}}", "<3><4><5>", tVal, true},
+ {"range $x $y SI", "{{range $x, $y := .SI}}<{{$x}}={{$y}}>{{end}}", "<0=3><1=4><2=5>", tVal, true},
+ {"range $x MSIone", "{{range $x := .MSIone}}<{{$x}}>{{end}}", "<1>", tVal, true},
+ {"range $x $y MSIone", "{{range $x, $y := .MSIone}}<{{$x}}={{$y}}>{{end}}", "<one=1>", tVal, true},
+ {"range $x PSI", "{{range $x := .PSI}}<{{$x}}>{{end}}", "<21><22><23>", tVal, true},
+ {"declare in range", "{{range $x := .PSI}}<{{$foo:=$x}}{{$x}}>{{end}}", "<21><22><23>", tVal, true},
+ {"range count", `{{range $i, $x := count 5}}[{{$i}}]{{$x}}{{end}}`, "[0]a[1]b[2]c[3]d[4]e", tVal, true},
+ {"range nil count", `{{range $i, $x := count 0}}{{else}}empty{{end}}`, "empty", tVal, true},
+
+ // Cute examples.
+ {"or as if true", `{{or .SI "slice is empty"}}`, "[3 4 5]", tVal, true},
+ {"or as if false", `{{or .SIEmpty "slice is empty"}}`, "slice is empty", tVal, true},
+
+ // Error handling.
+ {"error method, error", "{{.MyError true}}", "", tVal, false},
+ {"error method, no error", "{{.MyError false}}", "false", tVal, true},
+
+ // Numbers
+ {"decimal", "{{print 1234}}", "1234", tVal, true},
+ {"decimal _", "{{print 12_34}}", "1234", tVal, true},
+ {"binary", "{{print 0b101}}", "5", tVal, true},
+ {"binary _", "{{print 0b_1_0_1}}", "5", tVal, true},
+ {"BINARY", "{{print 0B101}}", "5", tVal, true},
+ {"octal0", "{{print 0377}}", "255", tVal, true},
+ {"octal", "{{print 0o377}}", "255", tVal, true},
+ {"octal _", "{{print 0o_3_7_7}}", "255", tVal, true},
+ {"OCTAL", "{{print 0O377}}", "255", tVal, true},
+ {"hex", "{{print 0x123}}", "291", tVal, true},
+ {"hex _", "{{print 0x1_23}}", "291", tVal, true},
+ {"HEX", "{{print 0X123ABC}}", "1194684", tVal, true},
+ {"float", "{{print 123.4}}", "123.4", tVal, true},
+ {"float _", "{{print 0_0_1_2_3.4}}", "123.4", tVal, true},
+ {"hex float", "{{print +0x1.ep+2}}", "7.5", tVal, true},
+ {"hex float _", "{{print +0x_1.e_0p+0_2}}", "7.5", tVal, true},
+ {"HEX float", "{{print +0X1.EP+2}}", "7.5", tVal, true},
+ {"print multi", "{{print 1_2_3_4 7.5_00_00_00}}", "1234 7.5", tVal, true},
+ {"print multi2", "{{print 1234 0x0_1.e_0p+02}}", "1234 7.5", tVal, true},
+
+ // Fixed bugs.
+ // Must separate dot and receiver; otherwise args are evaluated with dot set to variable.
+ {"bug0", "{{range .MSIone}}{{if $.Method1 .}}X{{end}}{{end}}", "X", tVal, true},
+ // Do not loop endlessly in indirect for non-empty interfaces.
+ // The bug appears with *interface only; looped forever.
+ {"bug1", "{{.Method0}}", "M0", &iVal, true},
+ // Was taking address of interface field, so method set was empty.
+ {"bug2", "{{$.NonEmptyInterface.Method0}}", "M0", tVal, true},
+ // Struct values were not legal in with - mere oversight.
+ {"bug3", "{{with $}}{{.Method0}}{{end}}", "M0", tVal, true},
+ // Nil interface values in if.
+ {"bug4", "{{if .Empty0}}non-nil{{else}}nil{{end}}", "nil", tVal, true},
+ // Stringer.
+ {"bug5", "{{.Str}}", "foozle", tVal, true},
+ {"bug5a", "{{.Err}}", "erroozle", tVal, true},
+ // Args need to be indirected and dereferenced sometimes.
+ {"bug6a", "{{vfunc .V0 .V1}}", "vfunc", tVal, true},
+ {"bug6b", "{{vfunc .V0 .V0}}", "vfunc", tVal, true},
+ {"bug6c", "{{vfunc .V1 .V0}}", "vfunc", tVal, true},
+ {"bug6d", "{{vfunc .V1 .V1}}", "vfunc", tVal, true},
+ // Legal parse but illegal execution: non-function should have no arguments.
+ {"bug7a", "{{3 2}}", "", tVal, false},
+ {"bug7b", "{{$x := 1}}{{$x 2}}", "", tVal, false},
+ {"bug7c", "{{$x := 1}}{{3 | $x}}", "", tVal, false},
+ // Pipelined arg was not being type-checked.
+ {"bug8a", "{{3|oneArg}}", "", tVal, false},
+ {"bug8b", "{{4|dddArg 3}}", "", tVal, false},
+ // A bug was introduced that broke map lookups for lower-case names.
+ {"bug9", "{{.cause}}", "neglect", map[string]string{"cause": "neglect"}, true},
+ // Field chain starting with function did not work.
+ {"bug10", "{{mapOfThree.three}}-{{(mapOfThree).three}}", "3-3", 0, true},
+ // Dereferencing nil pointer while evaluating function arguments should not panic. Issue 7333.
+ {"bug11", "{{valueString .PS}}", "", T{}, false},
+ // 0xef gave constant type float64. Issue 8622.
+ {"bug12xe", "{{printf `%T` 0xef}}", "int", T{}, true},
+ {"bug12xE", "{{printf `%T` 0xEE}}", "int", T{}, true},
+ {"bug12Xe", "{{printf `%T` 0Xef}}", "int", T{}, true},
+ {"bug12XE", "{{printf `%T` 0XEE}}", "int", T{}, true},
+ // Chained nodes did not work as arguments. Issue 8473.
+ {"bug13", "{{print (.Copy).I}}", "17", tVal, true},
+ // Didn't protect against nil or literal values in field chains.
+ {"bug14a", "{{(nil).True}}", "", tVal, false},
+ {"bug14b", "{{$x := nil}}{{$x.anything}}", "", tVal, false},
+ {"bug14c", `{{$x := (1.0)}}{{$y := ("hello")}}{{$x.anything}}{{$y.true}}`, "", tVal, false},
+ // Didn't call validateType on function results. Issue 10800.
+ {"bug15", "{{valueString returnInt}}", "", tVal, false},
+ // Variadic function corner cases. Issue 10946.
+ {"bug16a", "{{true|printf}}", "", tVal, false},
+ {"bug16b", "{{1|printf}}", "", tVal, false},
+ {"bug16c", "{{1.1|printf}}", "", tVal, false},
+ {"bug16d", "{{'x'|printf}}", "", tVal, false},
+ {"bug16e", "{{0i|printf}}", "", tVal, false},
+ {"bug16f", "{{true|twoArgs \"xxx\"}}", "", tVal, false},
+ {"bug16g", "{{\"aaa\" |twoArgs \"bbb\"}}", "twoArgs=bbbaaa", tVal, true},
+ {"bug16h", "{{1|oneArg}}", "", tVal, false},
+ {"bug16i", "{{\"aaa\"|oneArg}}", "oneArg=aaa", tVal, true},
+ {"bug16j", "{{1+2i|printf \"%v\"}}", "(1+2i)", tVal, true},
+ {"bug16k", "{{\"aaa\"|printf }}", "aaa", tVal, true},
+ {"bug17a", "{{.NonEmptyInterface.X}}", "x", tVal, true},
+ {"bug17b", "-{{.NonEmptyInterface.Method1 1234}}-", "-1234-", tVal, true},
+ {"bug17c", "{{len .NonEmptyInterfacePtS}}", "2", tVal, true},
+ {"bug17d", "{{index .NonEmptyInterfacePtS 0}}", "a", tVal, true},
+ {"bug17e", "{{range .NonEmptyInterfacePtS}}-{{.}}-{{end}}", "-a--b-", tVal, true},
+
+ // More variadic function corner cases. Some runes would get evaluated
+ // as constant floats instead of ints. Issue 34483.
+ {"bug18a", "{{eq . '.'}}", "true", '.', true},
+ {"bug18b", "{{eq . 'e'}}", "true", 'e', true},
+ {"bug18c", "{{eq . 'P'}}", "true", 'P', true},
+
+ {"issue56490", "{{$i := 0}}{{$x := 0}}{{range $i = .AI}}{{end}}{{$i}}", "5", tVal, true},
+ {"issue60801", "{{$k := 0}}{{$v := 0}}{{range $k, $v = .AI}}{{$k}}={{$v}} {{end}}", "0=3 1=4 2=5 ", tVal, true},
+}
+
+func zeroArgs() string {
+ return "zeroArgs"
+}
+
+func oneArg(a string) string {
+ return "oneArg=" + a
+}
+
+func twoArgs(a, b string) string {
+ return "twoArgs=" + a + b
+}
+
+func dddArg(a int, b ...string) string {
+ return fmt.Sprintln(a, b)
+}
+
+// count returns a channel that will deliver n sequential 1-letter strings starting at "a"
+func count(n int) chan string {
+ if n == 0 {
+ return nil
+ }
+ c := make(chan string)
+ go func() {
+ for i := 0; i < n; i++ {
+ c <- "abcdefghijklmnop"[i : i+1]
+ }
+ close(c)
+ }()
+ return c
+}
+
+// vfunc takes a *V and a V
+func vfunc(V, *V) string {
+ return "vfunc"
+}
+
+// valueString takes a string, not a pointer.
+func valueString(v string) string {
+ return "value is ignored"
+}
+
+// returnInt returns an int
+func returnInt() int {
+ return 7
+}
+
+func add(args ...int) int {
+ sum := 0
+ for _, x := range args {
+ sum += x
+ }
+ return sum
+}
+
+func echo(arg any) any {
+ return arg
+}
+
+func makemap(arg ...string) map[string]string {
+ if len(arg)%2 != 0 {
+ panic("bad makemap")
+ }
+ m := make(map[string]string)
+ for i := 0; i < len(arg); i += 2 {
+ m[arg[i]] = arg[i+1]
+ }
+ return m
+}
+
+func stringer(s fmt.Stringer) string {
+ return s.String()
+}
+
+func mapOfThree() any {
+ return map[string]int{"three": 3}
+}
+
+func testExecute(execTests []execTest, template *Template, t *testing.T) {
+ b := new(strings.Builder)
+ funcs := FuncMap{
+ "add": add,
+ "count": count,
+ "dddArg": dddArg,
+ "die": func() bool { panic("die") },
+ "echo": echo,
+ "makemap": makemap,
+ "mapOfThree": mapOfThree,
+ "oneArg": oneArg,
+ "returnInt": returnInt,
+ "stringer": stringer,
+ "twoArgs": twoArgs,
+ "typeOf": typeOf,
+ "valueString": valueString,
+ "vfunc": vfunc,
+ "zeroArgs": zeroArgs,
+ }
+ for _, test := range execTests {
+ var tmpl *Template
+ var err error
+ if template == nil {
+ tmpl, err = New(test.name).Funcs(funcs).Parse(test.input)
+ } else {
+ tmpl, err = template.New(test.name).Funcs(funcs).Parse(test.input)
+ }
+ if err != nil {
+ t.Errorf("%s: parse error: %s", test.name, err)
+ continue
+ }
+ b.Reset()
+ err = tmpl.Execute(b, test.data)
+ switch {
+ case !test.ok && err == nil:
+ t.Errorf("%s: expected error; got none", test.name)
+ continue
+ case test.ok && err != nil:
+ t.Errorf("%s: unexpected execute error: %s", test.name, err)
+ continue
+ case !test.ok && err != nil:
+ // expected error, got one
+ if *debug {
+ fmt.Printf("%s: %s\n\t%s\n", test.name, test.input, err)
+ }
+ }
+ result := b.String()
+ if result != test.output {
+ t.Errorf("%s: expected\n\t%q\ngot\n\t%q", test.name, test.output, result)
+ }
+ }
+}
+
+func TestExecute(t *testing.T) {
+ testExecute(execTests, nil, t)
+}
+
+var delimPairs = []string{
+ "", "", // default
+ "{{", "}}", // same as default
+ "<<", ">>", // distinct
+ "|", "|", // same
+ "(日)", "(本)", // peculiar
+}
+
+func TestDelims(t *testing.T) {
+ const hello = "Hello, world"
+ var value = struct{ Str string }{hello}
+ for i := 0; i < len(delimPairs); i += 2 {
+ text := ".Str"
+ left := delimPairs[i+0]
+ trueLeft := left
+ right := delimPairs[i+1]
+ trueRight := right
+ if left == "" { // default case
+ trueLeft = "{{"
+ }
+ if right == "" { // default case
+ trueRight = "}}"
+ }
+ text = trueLeft + text + trueRight
+ // Now add a comment
+ text += trueLeft + "/*comment*/" + trueRight
+ // Now add an action containing a string.
+ text += trueLeft + `"` + trueLeft + `"` + trueRight
+ // At this point text looks like `{{.Str}}{{/*comment*/}}{{"{{"}}`.
+ tmpl, err := New("delims").Delims(left, right).Parse(text)
+ if err != nil {
+ t.Fatalf("delim %q text %q parse err %s", left, text, err)
+ }
+ var b = new(strings.Builder)
+ err = tmpl.Execute(b, value)
+ if err != nil {
+ t.Fatalf("delim %q exec err %s", left, err)
+ }
+ if b.String() != hello+trueLeft {
+ t.Errorf("expected %q got %q", hello+trueLeft, b.String())
+ }
+ }
+}
+
+// Check that an error from a method flows back to the top.
+func TestExecuteError(t *testing.T) {
+ b := new(bytes.Buffer)
+ tmpl := New("error")
+ _, err := tmpl.Parse("{{.MyError true}}")
+ if err != nil {
+ t.Fatalf("parse error: %s", err)
+ }
+ err = tmpl.Execute(b, tVal)
+ if err == nil {
+ t.Errorf("expected error; got none")
+ } else if !strings.Contains(err.Error(), myError.Error()) {
+ if *debug {
+ fmt.Printf("test execute error: %s\n", err)
+ }
+ t.Errorf("expected myError; got %s", err)
+ }
+}
+
+const execErrorText = `line 1
+line 2
+line 3
+{{template "one" .}}
+{{define "one"}}{{template "two" .}}{{end}}
+{{define "two"}}{{template "three" .}}{{end}}
+{{define "three"}}{{index "hi" $}}{{end}}`
+
+// Check that an error from a nested template contains all the relevant information.
+func TestExecError(t *testing.T) {
+ tmpl, err := New("top").Parse(execErrorText)
+ if err != nil {
+ t.Fatal("parse error:", err)
+ }
+ var b bytes.Buffer
+ err = tmpl.Execute(&b, 5) // 5 is out of range indexing "hi"
+ if err == nil {
+ t.Fatal("expected error")
+ }
+ const want = `template: top:7:20: executing "three" at <index "hi" $>: error calling index: index out of range: 5`
+ got := err.Error()
+ if got != want {
+ t.Errorf("expected\n%q\ngot\n%q", want, got)
+ }
+}
+
+type CustomError struct{}
+
+func (*CustomError) Error() string { return "heyo !" }
+
+// Check that a custom error can be returned.
+func TestExecError_CustomError(t *testing.T) {
+ failingFunc := func() (string, error) {
+ return "", &CustomError{}
+ }
+ tmpl := Must(New("top").Funcs(FuncMap{
+ "err": failingFunc,
+ }).Parse("{{ err }}"))
+
+ var b bytes.Buffer
+ err := tmpl.Execute(&b, nil)
+
+ var e *CustomError
+ if !errors.As(err, &e) {
+ t.Fatalf("expected custom error; got %s", err)
+ }
+}
+
+func TestJSEscaping(t *testing.T) {
+ testCases := []struct {
+ in, exp string
+ }{
+ {`a`, `a`},
+ {`'foo`, `\'foo`},
+ {`Go "jump" \`, `Go \"jump\" \\`},
+ {`Yukihiro says "今日は世界"`, `Yukihiro says \"今日は世界\"`},
+ {"unprintable \uFFFE", `unprintable \uFFFE`},
+ {`<html>`, `\u003Chtml\u003E`},
+ {`no = in attributes`, `no \u003D in attributes`},
+ {`&#x27; 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 strings.Builder
+ 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 .NilIface", "false", true},
+ {"eq .NilIface .NilIface", "true", true},
+ {"eq .NilIface .Iface1", "false", true},
+ {"eq .NilIface 0", "false", true},
+ {"eq 0 .NilIface", "false", true},
+ {"eq .Map .Map", "true", true}, // Uncomparable types but nil is OK.
+ {"eq .Map nil", "true", true}, // Uncomparable types but nil is OK.
+ {"eq nil .Map", "true", true}, // Uncomparable types but nil is OK.
+ {"eq .Map .NonNilMap", "false", true}, // Uncomparable types but nil is OK.
+ // 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 .V1", "", false}, // Uncomparable types.
+ {"eq .NonNilMap .NonNilMap", "", false}, // Uncomparable types.
+}
+
+func TestComparison(t *testing.T) {
+ b := new(strings.Builder)
+ var cmpStruct = struct {
+ Uthree, Ufour uint
+ NegOne, Three int
+ Ptr, NilPtr *int
+ NonNilMap map[int]int
+ Map map[int]int
+ V1, V2 V
+ Iface1, NilIface fmt.Stringer
+ }{
+ Uthree: 3,
+ Ufour: 4,
+ NegOne: -1,
+ Three: 3,
+ Ptr: new(int),
+ NonNilMap: make(map[int]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 strings.Builder
+ // 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: 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.(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 strings.Builder
+ 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 any
+ 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 strings.Builder
+ 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 strings.Builder
+ err := tmpl.Execute(&buf, map[string]any{
+ "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]any{
+ "doPanic": func() string {
+ panic("custom panic string")
+ },
+ }
+ tests := []struct {
+ name string
+ input string
+ data any
+ 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 strings.Builder
+ 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 43065, range over send only channel
+func TestIssue43065(t *testing.T) {
+ var b bytes.Buffer
+ tmp := Must(New("").Parse(`{{range .}}{{end}}`))
+ ch := make(chan<- int)
+ err := tmp.Execute(&b, ch)
+ if err == nil {
+ t.Error("expected err got nil")
+ } else if !strings.Contains(err.Error(), "range over send-only channel") {
+ t.Errorf("%s", err)
+ }
+}
+
+// Issue 39807: data race in html/template & text/template
+func TestIssue39807(t *testing.T) {
+ var wg sync.WaitGroup
+
+ tplFoo, err := New("foo").Parse(`{{ template "bar" . }}`)
+ if err != nil {
+ t.Error(err)
+ }
+
+ tplBar, err := New("bar").Parse("bar")
+ if err != nil {
+ t.Error(err)
+ }
+
+ gofuncs := 10
+ numTemplates := 10
+
+ for i := 1; i <= gofuncs; i++ {
+ wg.Add(1)
+ go func() {
+ defer wg.Done()
+ for j := 0; j < numTemplates; j++ {
+ _, err := tplFoo.AddParseTree(tplBar.Name(), tplBar.Tree)
+ if err != nil {
+ t.Error(err)
+ }
+ err = tplFoo.Execute(io.Discard, nil)
+ if err != nil {
+ t.Error(err)
+ }
+ }
+ }()
+ }
+
+ wg.Wait()
+}
+
+// Issue 48215: embedded nil pointer causes panic.
+// Fixed by adding FieldByIndexErr to the reflect package.
+func TestIssue48215(t *testing.T) {
+ type A struct {
+ S string
+ }
+ type B struct {
+ *A
+ }
+ tmpl, err := New("").Parse(`{{ .S }}`)
+ if err != nil {
+ t.Fatal(err)
+ }
+ err = tmpl.Execute(io.Discard, B{})
+ // We expect an error, not a panic.
+ if err == nil {
+ t.Fatal("did not get error for nil embedded struct")
+ }
+ if !strings.Contains(err.Error(), "reflect: indirection through nil pointer to embedded struct field A") {
+ t.Fatal(err)
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-03 06:55:05 +0000