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feat: add ExtensionFieldNumber() function #91

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merged 1 commit into from
Dec 12, 2022
Merged

feat: add ExtensionFieldNumber() function #91

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15 changes: 15 additions & 0 deletions extensions.go
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Original file line number Diff line number Diff line change
Expand Up @@ -191,3 +191,18 @@ func ClearAllExtensions(msg interface{}) {
// no-op
}
}

// ExtensionFieldNumber returns the integer field tag associated with the specified proto2 extension
// descriptor. If ext is not one of the three supported types, this function returns 0 and an error.
func ExtensionFieldNumber(ext any) (int, error) {
switch tv := ext.(type) {
case *gogo.ExtensionDesc:
return int(tv.Field), nil
case *google.ExtensionDesc:
return int(tv.Field), nil
case protoreflect.ExtensionType:
return int(tv.TypeDescriptor().Number()), nil
default:
return 0, fmt.Errorf("unsupported proto2 extension descriptor type %T", ext)
}
}