swift-configuration decoder#1447
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This adds a swift Decoder that decodes from a swift-configuration ConfigSnapshot.
This adds the ability to modify how select types are decoded within the ConfigSnapshotDecoder. This is something that JSONEncoder already does with URLs specifically, however this enables users to configure this behavior for any arbitrary type regardless of existing Codable conformance.
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noah-thor
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Apr 24, 2026
| ## Runtime Library Exception to the Apache 2.0 License: ## | ||
| As an exception, if you use this Software to compile your source code and portions of this Software are embedded into the binary product as a result, you may redistribute such product without providing attribution as would otherwise be required by Sections 4(a), 4(b) and 4(d) of the License. | ||
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| **Apple Inc. and the SwiftConfiguration project authors ( swift-configuration )** |
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Not sure what the correct format is for the license in the notice
noah-thor
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Apr 24, 2026
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| public protocol ConfigEncodingStrategy: Sendable { | ||
| associatedtype Value: Encodable | ||
| func encode(_ value: Value, to encoder: Encoder) throws | ||
| } |
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Not currently used, but seemed like it could be handy in the future, making any config conform to ConfigCodingStrategy
noah-thor
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Apr 24, 2026
| DecodingError.Context( | ||
| codingPath: codingPath, | ||
| debugDescription: | ||
| "ConfigSnapshotDecoder does not support decoding arrays of \(T.self). Only arrays of primitive types (String, Int, Double, Bool) are supported." |
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We could add some of this functionality if we have a use case
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Type of Change
Motivation and Context
This adds a swift Decoder that decodes from a swift-configuration
ConfigSnapshot, and adds the ability to modify how select types are decoded within the
ConfigSnapshotDecoder. This is something that JSONEncoder already does
with URLs specifically, however this enables users to configure this
behavior for any arbitrary type regardless of existing Codable
conformance.
The decoder will help us expand on top of (pr: #1425), which switches user configuration to TOML. With this PR we will be able to provide a multi layered TOML if desired, allowing container to ship a default TOML instead of encoding them in code constants.
Testing