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Conditionally conform to Combine.TopLevelDecoder #132

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merged 7 commits into from Oct 4, 2019
Merged

Conditionally conform to Combine.TopLevelDecoder #132

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e7e7528
Conditionally conform to Combine.TopLevelDecoder
sharplet Sep 23, 2019
53955d2
Merge branch 'master' into top-level-decoder
MaxDesiatov Sep 25, 2019
5a2be53
Add test and documentation for Combine integration
sharplet Sep 30, 2019
eba5465
Remove macCatalyst from CombineTests
sharplet Sep 30, 2019
ae8e76a
Add CombineTests to the Xcode project
sharplet Sep 30, 2019
d3821f2
Merge branch 'master' into top-level-decoder
MaxDesiatov Oct 4, 2019
5994ae1
Disable CombineTests on macOS
MaxDesiatov Oct 4, 2019
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19 changes: 19 additions & 0 deletions README.md
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Expand Up @@ -269,6 +269,25 @@ extension IntOrString: Codable {
This is described in more details in PR [\#119](https://github.com/MaxDesiatov/XMLCoder/pull/119)
by [@jsbean](https://github.com/jsbean) and [@bwetherfield](https://github.com/bwetherfield).

## Integrating with [Combine](https://developer.apple.com/documentation/combine)

When Apple's Combine framework is available, `XMLDecoder` conforms to the
`TopLevelDecoder` protocol, which allows it to be used with the
`decode(type:decoder:)` operator:

```swift
import Combine
import Foundation
import XMLCoder

func fetchBook(from url: URL) -> AnyPublisher<Book, Error> {
return URLSession.shared.dataTaskPublisher(for: url)
.map(\.data)
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.decode(type: Book.self, decoder: XMLDecoder())
.eraseToAnyPublisher()
}
```

## Installation

### Requirements
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8 changes: 8 additions & 0 deletions Sources/XMLCoder/Decoder/XMLDecoder.swift
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Expand Up @@ -368,3 +368,11 @@ open class XMLDecoder {
return try decoder.unbox(topLevel)
}
}

// MARK: TopLevelDecoder

#if canImport(Combine)
import protocol Combine.TopLevelDecoder

extension XMLDecoder: TopLevelDecoder {}
#endif
37 changes: 37 additions & 0 deletions Tests/XMLCoderTests/CombineTests.swift
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@@ -0,0 +1,37 @@
//
// CombineTests.swift
// XMLCoder
//
// Created by Adam Sharp on 9/29/19.
//

#if canImport(Combine) && !os(macOS)
import Combine
import Foundation
import XCTest
import XMLCoder

private let xml = """
<?xml version="1.0" encoding="UTF-8"?>
<foo>
<name>Foo</name>
</foo>
""".data(using: .utf8)!

private struct Foo: Decodable {
var name: String
}

@available(iOS 13.0, macOS 10.15.0, tvOS 13.0, watchOS 6.0, *)
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I wonder if the solution would be to remove macOS 10.15.0 clause until that's released? We would avoid crashing on CI until then too. After all I wouldn't mind tagging a minor release just for enabling that later when Catalina is released and available on CI.

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Removing macOS from the availability annotation would instead result in a compiler error. The issue is that we successfully compile & link, but then attempt to run the tests on a platform where the framework doesn't exist and instead crash when the symbol can't be loaded.

If we want to exclude the test from macOS altogether, we could add #if !os(macOS) to the compiler directive at the top of the file. The tests won't be exercised on CI then, so it might still make sense to add a CI job that runs on Xcode 11 + iOS?

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The Xcode 11 job already tests on macOS, iOS and tvOS, so that should be fine.

class CombineTests: XCTestCase {
func testDecodeFromXMLDecoder() {
let data = Just(xml)
var foo: Foo?
_ = data.decode(type: Foo.self, decoder: XMLDecoder()).sink(
receiveCompletion: { _ in },
receiveValue: { foo = $0 }
)
XCTAssertEqual(foo?.name, "Foo")
}
}
#endif
4 changes: 4 additions & 0 deletions XMLCoder.xcodeproj/project.pbxproj
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Expand Up @@ -21,6 +21,7 @@
/* End PBXAggregateTarget section */

/* Begin PBXBuildFile section */
4A062D4F2341924E009BCAC1 /* CombineTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4A062D4E2341924E009BCAC1 /* CombineTests.swift */; };
B5EA3BB6230F237800D8D69B /* NestedChoiceArrayTest.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5EA3BB4230F235C00D8D69B /* NestedChoiceArrayTest.swift */; };
B5F74472233F74E400BBDB15 /* RootLevelAttributeTest.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5F74471233F74E400BBDB15 /* RootLevelAttributeTest.swift */; };
OBJ_148 /* BoolBox.swift in Sources */ = {isa = PBXBuildFile; fileRef = OBJ_12 /* BoolBox.swift */; };
Expand Down Expand Up @@ -154,6 +155,7 @@
/* End PBXContainerItemProxy section */

/* Begin PBXFileReference section */
4A062D4E2341924E009BCAC1 /* CombineTests.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CombineTests.swift; sourceTree = "<group>"; };
B5EA3BB4230F235C00D8D69B /* NestedChoiceArrayTest.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NestedChoiceArrayTest.swift; sourceTree = "<group>"; };
B5F74471233F74E400BBDB15 /* RootLevelAttributeTest.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = RootLevelAttributeTest.swift; sourceTree = "<group>"; };
OBJ_100 /* DecimalTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DecimalTests.swift; sourceTree = "<group>"; };
Expand Down Expand Up @@ -428,6 +430,7 @@
OBJ_86 /* CDCatalog.swift */,
OBJ_87 /* CDTest.swift */,
OBJ_88 /* ClassTests.swift */,
4A062D4E2341924E009BCAC1 /* CombineTests.swift */,
OBJ_89 /* CompositeChoiceTests.swift */,
OBJ_90 /* DecodingContainerTests.swift */,
OBJ_91 /* DynamicNodeDecodingTest.swift */,
Expand Down Expand Up @@ -742,6 +745,7 @@
OBJ_269 /* RJITest.swift in Sources */,
OBJ_270 /* RelationshipsTest.swift in Sources */,
OBJ_271 /* SimpleChoiceTests.swift in Sources */,
4A062D4F2341924E009BCAC1 /* CombineTests.swift in Sources */,
OBJ_272 /* SingleChildTests.swift in Sources */,
OBJ_273 /* SpacePreserveTest.swift in Sources */,
);
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