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text/template: fix type bug in eq

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{{eq .x 0}} where .x is a nil interface{} should be false, not a type error.

Similarly, {{eq .x .x}} should succeed, not panic in reflect.

Fixes #45982.

Change-Id: I90aba82bb2f1a9e162bde1290c94f5028f56f412
Reviewed-on: https://go-review.googlesource.com/c/go/+/317470
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
This commit is contained in:
Russ Cox 2021-05-05 21:13:24 -04:00
parent 0e7a7a68cd
commit d2fd503f68
2 changed files with 15 additions and 10 deletions
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9
src/text/template/exec_test.go
View File

@ -1201,8 +1201,11 @@ var cmpTests = []cmpTest{
{"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},
{"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},
// Errors
{"eq `xy` 1", "", false}, // Different types.
{"eq 2 2.0", "", false}, // Different types.
@ -1222,7 +1225,7 @@ func TestComparison(t *testing.T) {
Ptr, NilPtr *int
Map map[int]int
V1, V2 V
Iface1, Iface2 fmt.Stringer
Iface1, NilIface fmt.Stringer
}{
Uthree: 3,
Ufour: 4,

4
src/text/template/funcs.go
View File

@ -478,8 +478,10 @@ func eq(arg1 reflect.Value, arg2 ...reflect.Value) (bool, error) {
case k1 == uintKind && k2 == intKind:
truth = arg.Int() >= 0 && arg1.Uint() == uint64(arg.Int())
default:
if arg1 != zero && arg != zero {
return false, errBadComparison
}
}
} else {
switch k1 {
case boolKind:
@ -495,7 +497,7 @@ func eq(arg1 reflect.Value, arg2 ...reflect.Value) (bool, error) {
case uintKind:
truth = arg1.Uint() == arg.Uint()
default:
if arg == zero {
if arg == zero || arg1 == zero {
truth = arg1 == arg
} else {
if t2 := arg.Type(); !t2.Comparable() {