35 lines
804 B
Go
35 lines
804 B
Go
//go:build !go1.18
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// +build !go1.18
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package redis
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import (
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"errors"
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"reflect"
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)
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// fieldByIndexErr returns the nested field corresponding to index.
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// It returns an error if evaluation requires stepping through a nil
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// pointer, but panics if it must step through a field that
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// is not a struct.
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func fieldByIndexErr(v reflect.Value, index []int) (reflect.Value, error) {
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if len(index) == 1 {
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return v.Field(index[0]), nil
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}
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mustBe(v, reflect.Struct)
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for i, x := range index {
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if i > 0 {
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if v.Kind() == reflect.Ptr && v.Type().Elem().Kind() == reflect.Struct {
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if v.IsNil() {
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return reflect.Value{}, errors.New("reflect: indirection through nil pointer to embedded struct field " + v.Type().Elem().Name())
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}
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v = v.Elem()
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}
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}
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v = v.Field(x)
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}
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return v, nil
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}
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