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Allow the != operator to be used on nil

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Elara
2024-06-06 19:09:50 -07:00
parent d5c33f9e5d
commit 849295bb5f
1 changed files with 7 additions and 3 deletions
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10
expr.go
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@@ -55,13 +55,17 @@ func (t *Template) performOp(a, b reflect.Value, op ast.Operator) (any, error) {
return nil, ast.PosError(op, "the in operator can only be used on strings, arrays, and slices (got %s and %s)", a.Type(), b.Type()) return nil, ast.PosError(op, "the in operator can only be used on strings, arrays, and slices (got %s and %s)", a.Type(), b.Type())
} }
} else if !b.IsValid() { } else if !b.IsValid() {
if op.Value != "==" { if op.Value != "==" && op.Value != "!=" {
return nil, ast.PosError(op, "invalid operator for nil value (expected ==, got %s)", op.Value) return nil, ast.PosError(op, "invalid operator for nil value (expected == or !=, got %s)", op.Value)
} }
switch a.Kind() { switch a.Kind() {
case reflect.Chan, reflect.Slice, reflect.Map, reflect.Func, reflect.Interface, reflect.Pointer: case reflect.Chan, reflect.Slice, reflect.Map, reflect.Func, reflect.Interface, reflect.Pointer:
return a.IsNil(), nil if op.Value == "==" {
return a.IsNil(), nil
} else {
return !a.IsNil(), nil
}
default: default:
return nil, ast.PosError(op, "values of type %s cannot be compared against nil", a.Type()) return nil, ast.PosError(op, "values of type %s cannot be compared against nil", a.Type())
} }