Mihaela M
4941eac711
A ':' that opens a line with no key before it is a mapping entry with a
null key (': value', a bare ':', or a null-keyed entry among others). The
scanner emitted the ':' with no preceding key, so the parser rejected it
as a missing node.
The scanner now synthesizes the empty key and its node for such a ':'. To
avoid mistaking an explicit key's value indicator for a null key, it tracks
a pending block-level '?' key: a ':' opening a line is that key's value
when one is pending, and only a synthesized null key otherwise. The flag
is set and cleared only at flow depth zero, so a ':' inside a flow complex
key ('? {a: b}' then ': c') does not disturb the pending block key.
Measured against the official YAML test-suite, parse-level conformance
rises from 283/333 (85.0%) to 287/333 (86.2%) with no regression.
34 lines
1.3 KiB
Swift
34 lines
1.3 KiB
Swift
@testable import PureYAML
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import Testing
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@Suite("Implicit null mapping keys")
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struct ImplicitNullKeyTests {
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@Test("A `:` opening a line is an implicit null key")
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func test_implicitNullKey() throws {
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#expect(try PureYAML.parse(": value\n") == .mapping(.init([
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.init(keyNode: .string(""), value: .string("value")),
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])))
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}
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@Test("Several null-keyed entries and a bare `:` parse")
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func test_multipleNullKeys() throws {
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_ = try PureYAML.parse(": a\n: b\n")
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_ = try PureYAML.parse(":\n")
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#expect(try PureYAML.parse("a: 1\n: b\n") == .mapping(.init([
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.init(key: "a", value: .int(1)),
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.init(keyNode: .string(""), value: .string("b")),
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])))
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}
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@Test("Explicit keys, including a complex one, are not mistaken for null keys")
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func test_explicitKeysUnaffected() throws {
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#expect(try PureYAML.parse("? a\n: b\n") == .mapping(.init([
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.init(key: "a", value: .string("b")),
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])))
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// The `:` after a flow complex key is the key's value, not a null key.
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#expect(try PureYAML.parse("? {a: b}\n: c\n") == .mapping(.init([
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.init(keyNode: .mapping(.init([.init(key: "a", value: .string("b"))])), value: .string("c")),
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])))
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}
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}
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