Mihaela Mihaljevic
627c035c2a
Add the PureXML.XPointer namespace resolving the shorthand bare-name form (id), the element() scheme (child-element positions from an id or the document root), and the xpointer() scheme (a full XPath expression). Scheme parts chain with the XPointer fallback rule: the first non-empty selection wins. element() data is translated to the equivalent XPath and evaluated by PureXML.XPath, so no separate evaluator is needed. Closes #46 Closes #47 Closes #23
65 lines
2.2 KiB
Swift
65 lines
2.2 KiB
Swift
@testable import PureXML
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import Testing
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@Suite("XPointer")
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struct XPointerTests {
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private func doc() throws -> PureXML.Model.Node {
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try PureXML.parse(
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"<book>"
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+ "<chapter id=\"intro\"><para>first</para><para>second</para></chapter>"
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+ "<chapter id=\"main\"><para>third</para></chapter>"
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+ "</book>",
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)
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}
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private func strings(_ pointer: String) throws -> [String] {
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try PureXML.XPointer.evaluate(pointer, over: doc()).map(\.stringValue)
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}
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@Test("A shorthand pointer resolves an id")
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func test_shorthand() throws {
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#expect(try strings("intro") == ["firstsecond"])
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}
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@Test("element() navigates child positions from an id")
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func test_elementFromId() throws {
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#expect(try strings("element(intro/2)") == ["second"])
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#expect(try strings("element(intro/1)") == ["first"])
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}
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@Test("element() navigates from the document root")
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func test_elementFromRoot() throws {
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#expect(try strings("element(/1/2)") == ["third"])
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#expect(try strings("element(/1)") == ["firstsecondthird"])
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}
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@Test("xpointer() evaluates a full XPath expression")
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func test_xpointerScheme() throws {
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#expect(try strings("xpointer(//para[2])") == ["second"])
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#expect(try strings("xpointer(//chapter[@id='main']/para)") == ["third"])
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}
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@Test("Scheme parts fall back to the first non-empty result")
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func test_fallback() throws {
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// The first part selects nothing (no such id), so the second part wins.
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#expect(try strings("element(nope/1)element(main/1)") == ["third"])
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}
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@Test("A malformed pointer is rejected")
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func test_malformed() {
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#expect(throws: PureXML.XPointer.XPointerError.self) {
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_ = try PureXML.XPointer.Pointer("xpointer(")
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}
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#expect(throws: PureXML.XPointer.XPointerError.self) {
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_ = try PureXML.XPointer.Pointer("bogus(/1)")
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}
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}
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@Test("An empty pointer is rejected")
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func test_empty() {
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#expect(throws: PureXML.XPointer.XPointerError.empty) {
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_ = try PureXML.XPointer.Pointer(" ")
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}
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}
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}
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