alef 0.113.4

Opinionated polyglot binding generator for Rust libraries
Documentation 
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import Foundation

struct CustomStringConvertible {}

struct BridgeString {
    let value: String
    func toString() -> String { value }
}
enum RustBridge {
    struct AlefBridgeError: Error {
        let text: String
        let variant: String
        let fields: [String: String]
        func message() -> BridgeString { BridgeString(value: text) }
        func kind() -> BridgeString { BridgeString(value: variant) }
        func status() -> Int64 { -1 }
        func retryAfterMs() -> Int64 { -1 }
        func errorType() -> BridgeString { BridgeString(value: "SampleError") }
        func payload() -> BridgeString {
            let data = try! JSONSerialization.data(withJSONObject: fields)
            return BridgeString(value: String(data: data, encoding: .utf8)!)
        }
    }
}

{{ declaration }}

let cases: [(String, String, [String: String])] = [
    ("NotFound", "not_found: raw payload", ["message": "\"raw payload\""]),
    ("Blocked", "access_denied: filter/block: raw payload", ["message": "\"raw payload\""]),
    ("PolicyRejected", "policy_rejected: sample://entry - rejected", ["message": "\"raw payload\"", "url": "\"sample://entry\"", "reason": "\"rejected\""]),
    ("Escaped", "{prefix}: \"raw payload\"\\tail\n", ["message": "\"raw payload\""]),
    ("Empty", "empty operation", [:]),
    ("Synthetic", "custom display retained from bridge", ["detail": "\"detail\""]),
    ("Unsupported", "raw payload", ["message": "\"raw payload\""]),
    ("Opaque", "Opaque", [:]),
]
for (kind, expected, fields) in cases {
    let bridgeText = kind == "Opaque" ? "arbitrary unavailable custom Display" : kind == "Unsupported" ? "debug: \"raw payload\"" : expected
    let bridge = RustBridge.AlefBridgeError(text: bridgeText, variant: kind, fields: fields)
    do {
        try alefBridgedCall { () throws -> Void in throw bridge }
        fatalError("bridge must throw")
    } catch {
        guard let typed = error as? SampleError else { fatalError("typed error must survive") }
        precondition(typed.kind == kind, "typed identity must survive")
        precondition(String(describing: typed) == expected, "Display text must survive")
        precondition(typed.description == expected, "description must match")
        switch typed {
        case .notFound(message: let message), .blocked(message: let message), .escaped(message: let message), .unsupported(message: let message):
            precondition(message == "raw payload", "raw message payload must survive")
        case .policyRejected(message: let message, url: let url, reason: let reason):
            precondition(message == "raw payload" && url == "sample://entry" && reason == "rejected", "all raw payload fields must survive")
        case .synthetic(message: let message, detail: let detail):
            precondition(message == expected && detail == "detail", "synthetic Display must survive")
        default: break
        }
    }
}
let ordinary = NSError(domain: "ordinary", code: 1)
precondition((alefTypedError(ordinary) as NSError) === ordinary, "ordinary errors must pass through")
print("verified \(cases.count) typed descriptions and ordinary error passthrough")