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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,81 @@ | ||
| pub(crate) use map_entry::into_map; | ||
|
|
||
| #[allow(unused)] | ||
| pub(crate) use map_entry::set_map; | ||
|
|
||
| /// Helper functions to convert between capnp maps (List's of MapEntries) and rust maps | ||
| mod map_entry { | ||
| use capnp::{ | ||
| struct_list::{Builder, Reader}, | ||
| traits::OwnedStruct, | ||
| }; | ||
| use conmon_common::conmon_capnp::conmon; | ||
|
|
||
| /// Convert from a MapEntry capnp struct to a (key, value) tuple. | ||
| pub(crate) trait IntoKeyValue<'a, K, V>: OwnedStruct { | ||
| fn into_key_value(entry: Self::Reader<'a>) -> capnp::Result<(K, V)>; | ||
| } | ||
|
|
||
| /// Set the key and value properties of a MapEntry capnp struct. | ||
| pub(crate) trait SetKeyValue<K, V>: OwnedStruct { | ||
| fn set_key_value(entry: Self::Builder<'_>, key: K, value: V); | ||
| } | ||
|
|
||
| impl<'a, K, V> IntoKeyValue<'a, K, V> for conmon::text_text_map_entry::Owned | ||
| where | ||
| K: From<&'a str>, | ||
| V: From<&'a str>, | ||
| { | ||
| fn into_key_value(entry: Self::Reader<'a>) -> capnp::Result<(K, V)> { | ||
| Ok((entry.get_key()?.into(), entry.get_value()?.into())) | ||
| } | ||
| } | ||
|
|
||
| impl<K, V> SetKeyValue<K, V> for conmon::text_text_map_entry::Owned | ||
| where | ||
| K: AsRef<str>, | ||
| V: AsRef<str>, | ||
| { | ||
| fn set_key_value(mut entry: Self::Builder<'_>, key: K, value: V) { | ||
| entry.set_key(key.as_ref()); | ||
| entry.set_value(value.as_ref()); | ||
| } | ||
| } | ||
|
|
||
| /// Convert a capnp map reader (`struct_list::Reader`) into a rust map (`impl FromIterator<(K, V)>`). | ||
| pub(crate) fn into_map<'a, K, V, E, T>(reader: Reader<'a, E>) -> capnp::Result<T> | ||
| where | ||
| E: IntoKeyValue<'a, K, V>, | ||
| T: FromIterator<(K, V)>, | ||
| { | ||
| reader.into_iter().map(E::into_key_value).collect() | ||
| } | ||
|
|
||
| /// Set a capnp map property from a rust map (`impl IntoIterator<Item=(K, V)>`). | ||
| /// | ||
| /// The `init` function is used to allocate a `struct_list::Builder`. | ||
| /// | ||
| /// ## Example | ||
| /// Set the `exampleMap` property in the response capnp builder to the rust map `data` | ||
| /// ```ignore | ||
| /// set_from_map(data, |size| response.init_example_map(size)); | ||
| /// ``` | ||
| pub(crate) fn set_map<'a, K, V, E, T>(data: T, init: impl FnOnce(u32) -> Builder<'a, E>) | ||
| where | ||
| T: IntoIterator<Item = (K, V)>, | ||
| T::IntoIter: ExactSizeIterator, | ||
| E: SetKeyValue<K, V>, | ||
| { | ||
| let data = data.into_iter(); | ||
| let size = if let Ok(size) = data.len().try_into() { | ||
| size | ||
| } else { | ||
| panic!("map with more then u32::MAX entries") | ||
| }; | ||
| let mut list = init(size); | ||
| for (i, (key, value)) in data.enumerate() { | ||
| let entry = list.reborrow().get(i as u32); | ||
| E::set_key_value(entry, key, value); | ||
| } | ||
| } | ||
| } |
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