alef 0.23.30

Opinionated polyglot binding generator for Rust libraries
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55

// Generated by alef. Do not edit by hand.
// swift-format-ignore-file
// This file contains generated FFI glue for trait bridge registration.

import Foundation
import RustBridge

/// Protocol for outbound `{{ trait_name }}` implementations.
/// Conform your Swift class or struct to this protocol to implement
/// a Rust trait from the host side.
public protocol {{ protocol }}: SwiftPluginBridge {
{{ protocol_methods }}}

public extension {{ protocol }} {
{{ default_methods }}}

/// Internal adapter wrapping a `{{ protocol }}` conformer.
/// Marshals Swift types and trait calls to/from the C boundary.
/// Excluded/internal types are serialised to/from JSON strings.
final class Swift{{ trait_name }}Adapter {
    private let bridge: any {{ protocol }}

    init(bridge: any {{ protocol }}) {
        self.bridge = bridge
    }

{{ adapter_methods }}}

// MARK: - Marshalling helpers

private struct Empty: Codable {}

private func marshal_ok_result<T: Encodable>(_ value: T) -> String {
    let encoder = JSONEncoder()
    if let data = try? encoder.encode(value),
       let jsonString = String(data: data, encoding: .utf8) {
        return "{\"ok\": \(jsonString)}"
    }
    return "{\"ok\": null}"
}

private func marshal_encode_excluded<T: Encodable>(_ value: T) throws -> Data {
    let encoder = JSONEncoder()
    return try encoder.encode(value)
}

private func marshal_error_result(_ error: any Error) -> String {
    let errorString = String(describing: error)
    let encoder = JSONEncoder()
    if let data = try? encoder.encode(errorString),
       let jsonString = String(data: data, encoding: .utf8) {
        return "{\"err\": \(jsonString)}"
    }
    return "{\"err\": \"unknown error\"}"
}