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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2024 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
// Loosely adapted from https://github.com/apple/swift/tree/main/stdlib/private/StdlibCollectionUnittest
// FIXME: Port all of the collection validation tests from the Swift compiler codebase.
import XCTest
extension BidirectionalCollection {
func _indicesByIndexBefore() -> [Index] {
var result: [Index] = []
var i = endIndex
while i != startIndex {
i = index(before: i)
result.append(i)
}
result.reverse()
return result
}
func _indicesByFormIndexBefore() -> [Index] {
var result: [Index] = []
var i = endIndex
while i != startIndex {
formIndex(before: &i)
result.append(i)
}
result.reverse()
return result
}
}
public func checkBidirectionalCollection<C: BidirectionalCollection, S: Sequence>(
_ collection: C,
expectedContents: S,
maxSamples: Int? = nil,
file: StaticString = #file,
line: UInt = #line
) where C.Element: Equatable, S.Element == C.Element {
checkBidirectionalCollection(
collection,
expectedContents: expectedContents,
by: ==,
maxSamples: maxSamples,
file: file,
line: line)
}
public func checkBidirectionalCollection<C: BidirectionalCollection, S: Sequence>(
_ collection: C,
expectedContents: S,
by areEquivalent: (S.Element, S.Element) -> Bool,
maxSamples: Int? = nil,
file: StaticString = #file,
line: UInt = #line
) where S.Element == C.Element {
checkSequence(
{ collection }, expectedContents: expectedContents,
by: areEquivalent,
file: file, line: line)
_checkCollection(
collection, expectedContents: expectedContents,
by: areEquivalent,
maxSamples: maxSamples,
file: file, line: line)
_checkBidirectionalCollection(
collection, expectedContents: expectedContents,
by: areEquivalent,
maxSamples: maxSamples,
file: file, line: line)
}
public func _checkBidirectionalCollection_indexOffsetBy<
C: Collection
>(
_ collection: C,
expectedContents: [C.Element],
by areEquivalent: (C.Element, C.Element) -> Bool,
maxSamples: Int? = nil,
file: StaticString = #file,
line: UInt = #line
) {
var allIndices = collection._indicesByIndexAfter()
allIndices.append(collection.endIndex)
withSomeRanges(
"range",
in: 0 ..< allIndices.count - (1 as Int),
maxSamples: maxSamples
) { range in
let i = range.lowerBound
let j = range.upperBound
// Check `index(_,offsetBy:)` with negative offsets
let a = collection.index(allIndices[j], offsetBy: i - j)
expectEqual(a, allIndices[i])
if i < expectedContents.count {
expectEquivalent(
collection[a], expectedContents[i],
by: areEquivalent)
}
// Check `distance(from:to:)` with decreasing indices
let d = collection.distance(from: allIndices[j], to: allIndices[i])
expectEqual(d, i - j)
}
// Check `index(_,offsetBy:limitedBy:)`
let limits =
Set([0, allIndices.count - 1, allIndices.count / 2])
.sorted()
withEvery("limit", in: limits) { limit in
withEvery("i", in: 0 ..< allIndices.count) { i in
let min = -i - (limit <= i ? 2 : 0)
withEvery("delta", in: stride(from: 0, through: min, by: -1)) { delta in
let actual = collection.index(
allIndices[i],
offsetBy: delta,
limitedBy: allIndices[limit])
let j = i + delta
let expected = i < limit || j >= limit ? allIndices[j] : nil
expectEqual(actual, expected)
}
}
}
}
public func _checkBidirectionalCollection<C: BidirectionalCollection, S: Sequence>(
_ collection: C,
expectedContents: S,
by areEquivalent: (S.Element, S.Element) -> Bool,
maxSamples: Int? = nil,
file: StaticString = #file,
line: UInt = #line
) where S.Element == C.Element {
let entry = TestContext.current.push("checkBidirectionalCollection", file: file, line: line)
defer { TestContext.current.pop(entry) }
let expectedContents = Array(expectedContents)
// Check that `index(before:)` and `formIndex(before:)` are consistent with `index(after:)`.
let indicesByIndexAfter = collection._indicesByIndexAfter()
let indicesByIndexBefore = collection._indicesByIndexBefore()
let indicesByFormIndexBefore = collection._indicesByFormIndexBefore()
expectEqual(indicesByIndexBefore, indicesByIndexAfter)
expectEqual(indicesByFormIndexBefore, indicesByIndexAfter)
// Check contents using indexing.
let indexContents1 = indicesByIndexBefore.map { collection[$0] }
expectEquivalentElements(
indexContents1, expectedContents,
by: areEquivalent,
"\(expectedContents)")
let indexContents2 = indicesByFormIndexBefore.map { collection[$0] }
expectEquivalentElements(
indexContents2, expectedContents,
by: areEquivalent,
"\(expectedContents)")
// Check `distance(from:to:)`, `index(_:offsetBy)` and
// `index(_:offsetBy:limitedBy:)`.
_checkBidirectionalCollection_indexOffsetBy(
collection, expectedContents: expectedContents, by: areEquivalent)
var allIndices = indicesByIndexAfter
allIndices.append(collection.endIndex)
withSomeRanges(
"range",
in: 0 ..< allIndices.count - 1,
maxSamples: maxSamples
) { range in
let i = range.lowerBound
let j = range.upperBound
// Check slicing.
let slice = collection[allIndices[i] ..< allIndices[j]]
expectEqualElements(slice._indicesByIndexBefore(), allIndices[i ..< j])
expectEqualElements(slice._indicesByFormIndexBefore(), allIndices[i ..< j])
}
// Check the Indices associated type
if C.self != C.Indices.self && C.self != DefaultIndices<C>.self {
TestContext.current.withTrace("Indices") {
checkBidirectionalCollection(
collection.indices,
expectedContents: indicesByIndexAfter,
maxSamples: maxSamples)
}
}
}
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