Make coding paths non-optional [DO NOT MERGE] #1091
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This was referenced Jun 30, 2017
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For the benefit of unkeyed containers, coding paths currently contain optional `CodingKey`s — unkeyed containers are allowed to report a `nil` key in a path. However, this is unhelpful for debugging purposes, or inspecting the coding path for context, since any unkeyed container simply reports `nil`, whether it’s at index 1 or 1000. Now all containers are required to report a non-optional CodingKey for their segment of the coding path, and coding paths are now exposed as `[CodingKey]`.
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What's in this pull request?
Applies swiftlang/swift#10728 to
swift-corelibs-foundation.As laid out in a proposed update to SE-0166 and SE-0167, there are changes to unkeyed containers and coding paths that we want to introduce to the Codable API. This implements the remainder of those updates which had not yet been implemented:
For the benefit of unkeyed containers, coding paths currently contain optional
CodingKeys — unkeyed containers are allowed to report anilkey in a path. However, this is unhelpful for debugging purposes, or inspecting the coding path for context, since any unkeyed container simply reportsnil, whether it’s at index 1 or 1000Now all containers are required to report a non-optional CodingKey for their segment of the coding path, and coding paths are now exposed as
[CodingKey]To support this,
UnkeyedEncodingContainers now expose theircountandUnkeyedDecodingContainers expose theircurrentIndexThis PR should not be merged on its own. This must be merged in simultaneously with swiftlang/swift#10728 and swiftlang/swift#10728 to avoid breaking the build.