Mihaela Mihaljevic
4fe8771fb9
Add Query.value(at:position:size:variables:) to evaluate an expression against a context node already in a tree, with its proximity position, size, and variable bindings. position(), last(), and the upward axes resolve from that node. This completes full XPath 1.0: the per-node entry point that downstream engines (XSLT, Schematron) drive. Closes #43
40 lines
1.7 KiB
Swift
40 lines
1.7 KiB
Swift
@testable import PureXML
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import Testing
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@Suite("XPath evaluation context")
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struct XPathContextTests {
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@Test("A relative query evaluates against an explicit context node")
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func test_contextNode() throws {
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let tree = try PureXML.parseTree("<r><a><b>deep</b></a><a><b>other</b></a></r>")
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let firstA = tree.firstChild?.firstChild
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let value = try #require(firstA)
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let result = try PureXML.XPath.Query("b").value(at: value)
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#expect(result.string == "deep")
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}
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@Test("position() and last() reflect the supplied context")
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func test_positionAndSize() throws {
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let tree = try PureXML.parseTree("<r/>")
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let node = try #require(tree.firstChild)
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#expect(try PureXML.XPath.Query("position()").value(at: node, position: 3, size: 7).number == 3)
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#expect(try PureXML.XPath.Query("last()").value(at: node, position: 3, size: 7).number == 7)
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}
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@Test("Variable bindings are visible to the evaluated expression")
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func test_variableBindings() throws {
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let tree = try PureXML.parseTree("<r/>")
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let node = try #require(tree.firstChild)
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let value = try PureXML.XPath.Query("$x * 2").value(at: node, variables: ["x": .number(21)])
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#expect(value.number == 42)
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}
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@Test("Upward axes resolve from the context node's place in the tree")
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func test_upwardFromContext() throws {
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let tree = try PureXML.parseTree("<r id=\"root\"><a><b/></a></r>")
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let deepB = tree.firstChild?.firstChild?.firstChild
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let node = try #require(deepB)
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let result = try PureXML.XPath.Query("ancestor::r/@id").value(at: node)
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#expect(result.string == "root")
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}
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}
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