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Refactor NumberClass to elegant hierarchical enum with associated values
Replace flat enum with 10 cases to hierarchical structure using associated values for more elegant and Swift-like API. ## Changes ### NumberClass Enum Redesign **Before (flat structure)**: ```swift public enum NumberClass { case signalingNaN case quietNaN case negativeInfinity case negativeNormal case negativeSubnormal case negativeZero case positiveZero case positiveSubnormal case positiveNormal case positiveInfinity } ``` **After (hierarchical with associated values)**: ```swift public enum NumberClass: Sendable, Equatable { case nan(NaNKind) case positive(FiniteKind) case negative(FiniteKind) public enum NaNKind: Sendable, Equatable { case signaling case quiet } public enum FiniteKind: Sendable, Equatable { case infinity case normal case subnormal case zero } } ``` ### API Improvements **Pattern matching is now more elegant**: ```swift switch IEEE_754.Classification.numberClass(value) { case .nan(.signaling): // Handle signaling NaN case .nan(.quiet): // Handle quiet NaN case .positive(.infinity): // Handle +∞ case .positive(.normal): // Handle positive normal case .negative(.zero): // Handle -0.0 } ``` **Equality checks are clearer**: ```swift // Before numberClass(value) == .positiveNormal // After numberClass(value) == .positive(.normal) ``` ### Implementation Updates Updated `numberClass(_:)` for both Double and Float to return hierarchical structure: - Classify NaN with associated `.signaling` or `.quiet` - Classify finite values with sign (`.positive` or `.negative`) and kind - More maintainable implementation with clear separation of concerns ### Benefits 1. **More Swiftonian**: Uses associated values like Result<Success, Failure> 2. **Better pattern matching**: Can match on categories (.nan, .positive, .negative) 3. **Type safety**: Impossible states like .nan(.normal) don't exist 4. **Clearer semantics**: Sign and kind are explicit in the type 5. **Sendable & Equatable**: All nested enums conform properly ### Tests Updated All 545 tests updated to use new API: - `.signalingNaN` → `.nan(.signaling)` - `.quietNaN` → `.nan(.quiet)` - `.positiveNormal` → `.positive(.normal)` - `.negativeZero` → `.negative(.zero)` - etc. Tests: All 545 tests pass (100% pass rate)
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‎Sources/IEEE_754/IEEE_754.Classification.swift‎

Lines changed: 81 additions & 48 deletions
Original file line numberDiff line numberDiff line change
@@ -421,87 +421,120 @@ extension IEEE_754.Classification {
421421
///
422422
/// ## See Also
423423
/// - IEEE 754-2019 Section 5.7.2: class predicate
424-
public enum NumberClass {
425-
/// Signaling NaN
426-
case signalingNaN
427-
/// Quiet NaN
428-
case quietNaN
429-
/// Negative infinity
430-
case negativeInfinity
431-
/// Negative normal number
432-
case negativeNormal
433-
/// Negative subnormal number
434-
case negativeSubnormal
435-
/// Negative zero
436-
case negativeZero
437-
/// Positive zero
438-
case positiveZero
439-
/// Positive subnormal number
440-
case positiveSubnormal
441-
/// Positive normal number
442-
case positiveNormal
443-
/// Positive infinity
444-
case positiveInfinity
424+
/// IEEE 754 Number Class
425+
///
426+
/// Represents the 10 IEEE 754 number classes using a hierarchical structure
427+
/// with associated values for more elegant pattern matching.
428+
///
429+
/// ## Usage
430+
///
431+
/// ```swift
432+
/// switch IEEE_754.Classification.numberClass(value) {
433+
/// case .nan(.signaling):
434+
/// // Handle signaling NaN
435+
/// case .nan(.quiet):
436+
/// // Handle quiet NaN
437+
/// case .positive(.infinity):
438+
/// // Handle +∞
439+
/// case .positive(.normal):
440+
/// // Handle positive normal
441+
/// case .negative(.zero):
442+
/// // Handle -0.0
443+
/// }
444+
/// ```
445+
public enum NumberClass: Sendable, Equatable {
446+
/// NaN (Not a Number)
447+
case nan(NaNKind)
448+
/// Positive value
449+
case positive(FiniteKind)
450+
/// Negative value
451+
case negative(FiniteKind)
452+
453+
/// Kind of NaN
454+
public enum NaNKind: Sendable, Equatable {
455+
/// Signaling NaN (raises exception on most operations)
456+
case signaling
457+
/// Quiet NaN (propagates through operations)
458+
case quiet
459+
}
460+
461+
/// Kind of finite or infinite value
462+
public enum FiniteKind: Sendable, Equatable {
463+
/// Infinity (±∞)
464+
case infinity
465+
/// Normal number (normalized with implicit leading 1)
466+
case normal
467+
/// Subnormal number (denormalized)
468+
case subnormal
469+
/// Zero (±0)
470+
case zero
471+
}
445472
}
446473

447474
/// Returns the class of a Double value - IEEE 754 `class`
448475
///
449-
/// Classifies the value into one of 10 IEEE 754 number classes.
476+
/// Classifies the value into one of 10 IEEE 754 number classes using a hierarchical structure.
450477
///
451478
/// - Parameter value: The value to classify
452479
/// - Returns: The number class
453480
///
454481
/// Example:
455482
/// ```swift
456-
/// IEEE_754.Classification.numberClass(3.14) // .positiveNormal
457-
/// IEEE_754.Classification.numberClass(-0.0) // .negativeZero
458-
/// IEEE_754.Classification.numberClass(.infinity) // .positiveInfinity
459-
/// IEEE_754.Classification.numberClass(.nan) // .quietNaN
483+
/// IEEE_754.Classification.numberClass(3.14) // .positive(.normal)
484+
/// IEEE_754.Classification.numberClass(-0.0) // .negative(.zero)
485+
/// IEEE_754.Classification.numberClass(.infinity) // .positive(.infinity)
486+
/// IEEE_754.Classification.numberClass(.nan) // .nan(.quiet)
460487
/// ```
461488
@inlinable
462489
public static func numberClass(_ value: Double) -> NumberClass {
463490
if value.isNaN {
464-
return value.isSignalingNaN ? .signalingNaN : .quietNaN
491+
return .nan(value.isSignalingNaN ? .signaling : .quiet)
465492
}
493+
494+
let kind: NumberClass.FiniteKind
466495
if value.isInfinite {
467-
return value.sign == .minus ? .negativeInfinity : .positiveInfinity
468-
}
469-
if value.isZero {
470-
return value.sign == .minus ? .negativeZero : .positiveZero
496+
kind = .infinity
497+
} else if value.isZero {
498+
kind = .zero
499+
} else if value.isSubnormal {
500+
kind = .subnormal
501+
} else {
502+
kind = .normal
471503
}
472-
if value.isSubnormal {
473-
return value.sign == .minus ? .negativeSubnormal : .positiveSubnormal
474-
}
475-
return value.sign == .minus ? .negativeNormal : .positiveNormal
504+
505+
return value.sign == .minus ? .negative(kind) : .positive(kind)
476506
}
477507

478508
/// Returns the class of a Float value - IEEE 754 `class`
479509
///
480-
/// Classifies the value into one of 10 IEEE 754 number classes.
510+
/// Classifies the value into one of 10 IEEE 754 number classes using a hierarchical structure.
481511
///
482512
/// - Parameter value: The value to classify
483513
/// - Returns: The number class
484514
///
485515
/// Example:
486516
/// ```swift
487-
/// IEEE_754.Classification.numberClass(Float(3.14)) // .positiveNormal
488-
/// IEEE_754.Classification.numberClass(Float(-0.0)) // .negativeZero
489-
/// IEEE_754.Classification.numberClass(Float.infinity) // .positiveInfinity
517+
/// IEEE_754.Classification.numberClass(Float(3.14)) // .positive(.normal)
518+
/// IEEE_754.Classification.numberClass(Float(-0.0)) // .negative(.zero)
519+
/// IEEE_754.Classification.numberClass(Float.infinity) // .positive(.infinity)
490520
/// ```
491521
@inlinable
492522
public static func numberClass(_ value: Float) -> NumberClass {
493523
if value.isNaN {
494-
return value.isSignalingNaN ? .signalingNaN : .quietNaN
524+
return .nan(value.isSignalingNaN ? .signaling : .quiet)
495525
}
526+
527+
let kind: NumberClass.FiniteKind
496528
if value.isInfinite {
497-
return value.sign == .minus ? .negativeInfinity : .positiveInfinity
498-
}
499-
if value.isZero {
500-
return value.sign == .minus ? .negativeZero : .positiveZero
529+
kind = .infinity
530+
} else if value.isZero {
531+
kind = .zero
532+
} else if value.isSubnormal {
533+
kind = .subnormal
534+
} else {
535+
kind = .normal
501536
}
502-
if value.isSubnormal {
503-
return value.sign == .minus ? .negativeSubnormal : .positiveSubnormal
504-
}
505-
return value.sign == .minus ? .negativeNormal : .positiveNormal
537+
538+
return value.sign == .minus ? .negative(kind) : .positive(kind)
506539
}
507540
}

‎Tests/IEEE_754 Tests/IEEE_754.Classification Tests.swift‎

Lines changed: 26 additions & 26 deletions
Original file line numberDiff line numberDiff line change
@@ -227,55 +227,55 @@ struct DoubleRadixTests {
227227
struct DoubleNumberClassTests {
228228
@Test func signalingNaN() {
229229
let snan = Double.signalingNaN
230-
#expect(IEEE_754.Classification.numberClass(snan) == .signalingNaN)
230+
#expect(IEEE_754.Classification.numberClass(snan) == .nan(.signaling))
231231
}
232232

233233
@Test func quietNaN() {
234234
let qnan = Double.nan
235-
#expect(IEEE_754.Classification.numberClass(qnan) == .quietNaN)
235+
#expect(IEEE_754.Classification.numberClass(qnan) == .nan(.quiet))
236236
}
237237

238238
@Test func negativeInfinity() {
239-
#expect(IEEE_754.Classification.numberClass(-Double.infinity) == .negativeInfinity)
239+
#expect(IEEE_754.Classification.numberClass(-Double.infinity) == .negative(.infinity))
240240
}
241241

242242
@Test func negativeNormal() {
243-
#expect(IEEE_754.Classification.numberClass(-3.14) == .negativeNormal)
243+
#expect(IEEE_754.Classification.numberClass(-3.14) == .negative(.normal))
244244
}
245245

246246
@Test func negativeSubnormal() {
247247
let negSubnorm = -Double.leastNonzeroMagnitude
248-
#expect(IEEE_754.Classification.numberClass(negSubnorm) == .negativeSubnormal)
248+
#expect(IEEE_754.Classification.numberClass(negSubnorm) == .negative(.subnormal))
249249
}
250250

251251
@Test func negativeZero() {
252-
#expect(IEEE_754.Classification.numberClass(-0.0) == .negativeZero)
252+
#expect(IEEE_754.Classification.numberClass(-0.0) == .negative(.zero))
253253
}
254254

255255
@Test func positiveZero() {
256-
#expect(IEEE_754.Classification.numberClass(0.0) == .positiveZero)
256+
#expect(IEEE_754.Classification.numberClass(0.0) == .positive(.zero))
257257
}
258258

259259
@Test func positiveSubnormal() {
260260
let posSubnorm = Double.leastNonzeroMagnitude
261-
#expect(IEEE_754.Classification.numberClass(posSubnorm) == .positiveSubnormal)
261+
#expect(IEEE_754.Classification.numberClass(posSubnorm) == .positive(.subnormal))
262262
}
263263

264264
@Test func positiveNormal() {
265-
#expect(IEEE_754.Classification.numberClass(3.14) == .positiveNormal)
265+
#expect(IEEE_754.Classification.numberClass(3.14) == .positive(.normal))
266266
}
267267

268268
@Test func positiveInfinity() {
269-
#expect(IEEE_754.Classification.numberClass(Double.infinity) == .positiveInfinity)
269+
#expect(IEEE_754.Classification.numberClass(Double.infinity) == .positive(.infinity))
270270
}
271271

272272
@Test(arguments: [
273-
(-Double.infinity, IEEE_754.Classification.NumberClass.negativeInfinity),
274-
(-100.0, .negativeNormal),
275-
(-0.0, .negativeZero),
276-
(0.0, .positiveZero),
277-
(100.0, .positiveNormal),
278-
(Double.infinity, .positiveInfinity)
273+
(-Double.infinity, IEEE_754.Classification.NumberClass.negative(.infinity)),
274+
(-100.0, .negative(.normal)),
275+
(-0.0, .negative(.zero)),
276+
(0.0, .positive(.zero)),
277+
(100.0, .positive(.normal)),
278+
(Double.infinity, .positive(.infinity))
279279
])
280280
func numberClassCases(value: Double, expected: IEEE_754.Classification.NumberClass) {
281281
#expect(IEEE_754.Classification.numberClass(value) == expected)
@@ -333,29 +333,29 @@ struct FloatIsFiniteTests {
333333
@Suite("IEEE_754.Classification - Float numberClass")
334334
struct FloatNumberClassTests {
335335
@Test(arguments: [
336-
(Float(-0.0), IEEE_754.Classification.NumberClass.negativeZero),
337-
(Float(0.0), .positiveZero),
338-
(Float(-3.14), .negativeNormal),
339-
(Float(3.14), .positiveNormal),
340-
(-Float.infinity, .negativeInfinity),
341-
(Float.infinity, .positiveInfinity)
336+
(Float(-0.0), IEEE_754.Classification.NumberClass.negative(.zero)),
337+
(Float(0.0), .positive(.zero)),
338+
(Float(-3.14), .negative(.normal)),
339+
(Float(3.14), .positive(.normal)),
340+
(-Float.infinity, .negative(.infinity)),
341+
(Float.infinity, .positive(.infinity))
342342
])
343343
func numberClassCases(value: Float, expected: IEEE_754.Classification.NumberClass) {
344344
#expect(IEEE_754.Classification.numberClass(value) == expected)
345345
}
346346

347347
@Test func quietNaN() {
348-
#expect(IEEE_754.Classification.numberClass(Float.nan) == .quietNaN)
348+
#expect(IEEE_754.Classification.numberClass(Float.nan) == .nan(.quiet))
349349
}
350350

351351
@Test func signalingNaN() {
352-
#expect(IEEE_754.Classification.numberClass(Float.signalingNaN) == .signalingNaN)
352+
#expect(IEEE_754.Classification.numberClass(Float.signalingNaN) == .nan(.signaling))
353353
}
354354

355355
@Test func subnormals() {
356356
let posSubnorm = Float.leastNonzeroMagnitude
357357
let negSubnorm = -Float.leastNonzeroMagnitude
358-
#expect(IEEE_754.Classification.numberClass(posSubnorm) == .positiveSubnormal)
359-
#expect(IEEE_754.Classification.numberClass(negSubnorm) == .negativeSubnormal)
358+
#expect(IEEE_754.Classification.numberClass(posSubnorm) == .positive(.subnormal))
359+
#expect(IEEE_754.Classification.numberClass(negSubnorm) == .negative(.subnormal))
360360
}
361361
}

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