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Decoding choice elements that can hold empty structs #120

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merged 3 commits into from Jul 31, 2019
Merged

Decoding choice elements that can hold empty structs #120

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58152c6
Add test for empty struct choice elements
bwetherfield Jul 31, 2019
c87b068
Wrap NullBox for decoding
bwetherfield Jul 21, 2019
fd0a3a8
Refactor needless map
bwetherfield Jul 31, 2019
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2 changes: 1 addition & 1 deletion Sources/XMLCoder/Auxiliaries/KeyedStorage.swift
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Expand Up @@ -83,7 +83,7 @@ extension KeyedStorage where Key == String, Value == Box {
} else if let value = element.value {
result.append(StringBox(value), at: element.key)
} else {
result.append(NullBox(), at: element.key)
result.append(SingleKeyedBox(key: element.key, element: NullBox()), at: element.key)
}

return result
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20 changes: 18 additions & 2 deletions Sources/XMLCoder/Decoder/XMLKeyedDecodingContainer.swift
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Expand Up @@ -79,6 +79,10 @@ struct XMLKeyedDecodingContainer<K: CodingKey>: KeyedDecodingContainerProtocol {

let box = elements.first ?? attributes.first

if let singleKeyed = box as? SingleKeyedBox {
return singleKeyed.element.isNull
}

return box?.isNull ?? true
}

Expand Down Expand Up @@ -232,14 +236,26 @@ extension XMLKeyedDecodingContainer {
let keyString = key.stringValue.isEmpty ? "value" : key.stringValue
let value = keyedBox.elements[keyString]
if !value.isEmpty {
return value
return value.map {
if let singleKeyed = $0 as? SingleKeyedBox {
return singleKeyed.element
} else {
return $0
}
}
} else if let value = keyedBox.value {
return [value]
} else {
return []
}
} else {
return keyedBox.elements[key.stringValue]
return keyedBox.elements[key.stringValue].map {
if let singleKeyed = $0 as? SingleKeyedBox {
return singleKeyed.element
} else {
return $0
}
}
}
}

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44 changes: 44 additions & 0 deletions Tests/XMLCoderTests/NestedChoiceTests.swift
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Expand Up @@ -227,6 +227,50 @@ class NestedChoiceTests: XCTestCase {
XCTAssertEqual(result, expected)
}

func testNestedEnumsWithEmptyStruct() throws {
let xml = """
<container>
<p>
<br></br>
<run>
<id>1518</id>
<text>I am answering it again.</text>
</run>
<properties>
<id>431</id>
<title>A Word About Wake Times</title>
</properties>
</p>
<p>
<run>
<id>1519</id>
<text>I am answering it again.</text>
</run>
<br />
</p>
</container>
"""
let result = try XMLDecoder().decode(Container.self, from: xml.data(using: .utf8)!)
let expected = Container(
paragraphs: [
Paragraph(
entries: [
.br(Break()),
.run(Run(id: 1518, text: "I am answering it again.")),
.properties(Properties(id: 431, title: "A Word About Wake Times")),
]
),
Paragraph(
entries: [
.run(Run(id: 1519, text: "I am answering it again.")),
.br(Break()),
]
),
]
)
XCTAssertEqual(result, expected)
}

func testNestedEnumsRoundTrip() throws {
let original = Container(
paragraphs: [
Expand Down