1 use crate::gen::inside::protobuf_crate_path;
2 use crate::gen::rust_types_values::RustType;
3 use crate::Customize;
4 
5 /// Optional fields can be stored are `Option<T>` or `SingularPtrField<T>`.
6 #[derive(Copy, Clone, Eq, PartialEq)]
7 pub enum OptionKind {
8     /// Field is `Option<T>`
9     Option,
10     /// Field is `SingularPtrField<T>`
11     MessageField,
12 }
13 
14 impl OptionKind {
wrap_element(&self, element_type: RustType) -> RustType15     pub(crate) fn wrap_element(&self, element_type: RustType) -> RustType {
16         let element_type = Box::new(element_type);
17         match self {
18             OptionKind::Option => RustType::Option(element_type),
19             OptionKind::MessageField => RustType::MessageField(element_type),
20         }
21     }
22 
23     // Type of `as_ref()` operation
as_ref_type(&self, element_type: RustType) -> RustType24     pub(crate) fn as_ref_type(&self, element_type: RustType) -> RustType {
25         match self {
26             OptionKind::Option => RustType::Option(Box::new(element_type.ref_type())),
27             OptionKind::MessageField => RustType::MessageField(Box::new(element_type.ref_type())),
28         }
29     }
30 
_as_option_ref(&self, v: &str) -> String31     fn _as_option_ref(&self, v: &str) -> String {
32         match self {
33             OptionKind::Option | OptionKind::MessageField => format!("{}.as_ref()", v),
34         }
35     }
36 
unwrap_or_else(&self, what: &str, default_value: &str) -> String37     pub(crate) fn unwrap_or_else(&self, what: &str, default_value: &str) -> String {
38         match self {
39             _ => format!("{}.unwrap_or_else(|| {})", what, default_value),
40         }
41     }
42 
unwrap_ref_or_else(&self, what: &str, default_value: &str) -> String43     pub(crate) fn unwrap_ref_or_else(&self, what: &str, default_value: &str) -> String {
44         match self {
45             _ => format!("{}.unwrap_or_else(|| {})", what, default_value),
46         }
47     }
48 
wrap_value(&self, value: &str, customize: &Customize) -> String49     pub(crate) fn wrap_value(&self, value: &str, customize: &Customize) -> String {
50         match self {
51             OptionKind::Option => format!("::std::option::Option::Some({})", value),
52             OptionKind::MessageField => format!(
53                 "{}::MessageField::some({})",
54                 protobuf_crate_path(customize),
55                 value
56             ),
57         }
58     }
59 }
60