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600 lines
19 KiB
Swift
600 lines
19 KiB
Swift
//===--- CheckCollectionInstance.swift.gyb --------------------*- swift -*-===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See http://swift.org/LICENSE.txt for license information
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// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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%{
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from gyb_stdlib_unittest_support import TRACE, stackTrace, trace
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from gyb_stdlib_support import TRAVERSALS, collectionForTraversal
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}%
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import StdlibUnittest
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public struct CollectionMisuseResiliencyChecks {
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public enum FailureKind {
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case none
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case trap
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}
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public var creatingOutOfBoundsIndicesBehavior: FailureKind = .trap
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public var subscriptOnOutOfBoundsIndicesBehavior: FailureKind = .trap
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public var subscriptRangeOnOutOfBoundsRangesBehavior: FailureKind = .trap
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public static var all: CollectionMisuseResiliencyChecks {
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return CollectionMisuseResiliencyChecks()
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}
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public static var none: CollectionMisuseResiliencyChecks {
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return CollectionMisuseResiliencyChecks(
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creatingOutOfBoundsIndicesBehavior: .none,
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subscriptOnOutOfBoundsIndicesBehavior: .none,
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subscriptRangeOnOutOfBoundsRangesBehavior: .none)
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}
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}
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% for inc, protocol, direction, end in (
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% ('inc', 'Indexable', 'after', 'end'),
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% ('dec', 'BidirectionalIndexable', 'before', 'start')):
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/// Test that the elements of `instances` satisfy
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/// ${'some of ' if inc == 'dec' else ''}the semantic
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/// requirements of `${protocol}`, using `equalityOracle` to
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/// generate equality expectations from pairs of positions in
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/// `instances`.
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///
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/// - Precondition: ${'''`endIndex` is reachable from all
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/// elements of `instances`.''' if inc == 'inc' else '''all
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/// elements of `instances` are reachable from `startIndex`.'''}
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public func check${inc.capitalize()}rementable<
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Instances : Collection,
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BaseCollection : ${protocol}
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where
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Instances.Iterator.Element == BaseCollection.Index,
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// FIXME(compiler limitation): these constraints should be applied to
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// associated types of Collection.
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Instances.Indices.Iterator.Element == Instances.Index
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>(
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_ instances: Instances,
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of baseCollection: BaseCollection,
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equalityOracle: (Instances.Index, Instances.Index) -> Bool,
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${end}Index: Instances.Iterator.Element, ${TRACE}
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) {
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checkEquatable(instances, oracle: equalityOracle, ${trace})
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for i in instances {
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if i != ${end}Index {
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let next = baseCollection.index(${direction}: i)
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// index(${direction}:) gets us a new index value
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expectNotEqual(i, next, ${trace})
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// Which is the same as if we apply formIndex(${direction}:)
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var j = i
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baseCollection.formIndex(${direction}: &j)
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expectEqual(j, next, ${trace})
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}
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}
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}
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%end
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internal func _checkIncrementalAdvance<
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Instances : Collection,
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BaseCollection : Indexable
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where
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Instances.Iterator.Element == BaseCollection.Index,
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// FIXME(compiler limitation): these constraints should be applied to
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// associated types of Collection.
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Instances.Indices.Iterator.Element == Instances.Index
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>(
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_ instances: Instances,
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of baseCollection : BaseCollection,
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equalityOracle: (Instances.Index, Instances.Index) -> Bool,
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limit: Instances.Iterator.Element,
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sign: BaseCollection.IndexDistance, // 1 or -1
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next: (Instances.Iterator.Element) -> Instances.Iterator.Element,
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${TRACE}
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) {
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for i in instances {
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let d: BaseCollection.IndexDistance = sign > 0 ?
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baseCollection.distance(from: i, to: limit) :
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-baseCollection.distance(from: limit, to: i)
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var offset: BaseCollection.IndexDistance = 0
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for _ in 0...(d * sign).toIntMax() {
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let j = baseCollection.index(i, offsetBy: offset)
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let k = baseCollection.index(i, offsetBy: offset + sign, limitedBy: limit) ?? limit
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let jAtLimit = offset == d
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if jAtLimit {
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expectEqual(limit, j, ${trace})
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}
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expectEqual(jAtLimit ? j : next(j), k, ${trace})
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offset += sign
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}
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}
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}
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/// Test that the elements of `instances` satisfy the semantic requirements of
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/// index for `Collection`, using `equalityOracle` to generate equality
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/// expectations from pairs of positions in `instances`.
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///
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/// - Precondition: `endIndex` is reachable from all elements of
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/// `instances`
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public func checkForwardIndex<
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Instances : Collection,
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BaseCollection : Indexable
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where
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Instances.Iterator.Element == BaseCollection.Index,
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// FIXME(compiler limitation): these constraints should be applied to
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// associated types of Collection.
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Instances.Indices.Iterator.Element == Instances.Index
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>(
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_ instances: Instances,
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of baseCollection: BaseCollection,
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equalityOracle: (Instances.Index, Instances.Index) -> Bool,
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endIndex: Instances.Iterator.Element, ${TRACE}
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) {
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checkIncrementable(instances, of: baseCollection,
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equalityOracle: equalityOracle, endIndex: endIndex, ${trace})
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_checkIncrementalAdvance(instances, of: baseCollection,
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equalityOracle: equalityOracle, limit: endIndex,
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sign: 1, next: { baseCollection.index(after: $0) }, ${trace})
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}
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/// Test that the elements of `instances` satisfy the semantic requirements of
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/// index for `BidirectionalCollection`, using `equalityOracle` to generate
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/// equality expectations from pairs of positions in `instances`.
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///
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/// - Precondition:
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/// - all elements of `instances` are reachable from `startIndex`.
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/// - `endIndex` is reachable from all elements of `instances`.
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public func checkBidirectionalIndex<
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Instances: Collection,
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BaseCollection : BidirectionalIndexable
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where
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Instances.Iterator.Element == BaseCollection.Index,
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// FIXME(compiler limitation): these constraints should be applied to
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// associated types of Collection.
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Instances.Indices.Iterator.Element == Instances.Index
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>(
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_ instances: Instances,
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of baseCollection: BaseCollection,
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equalityOracle: (Instances.Index, Instances.Index) -> Bool,
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startIndex: Instances.Iterator.Element,
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endIndex: Instances.Iterator.Element,
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${TRACE}
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) {
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checkForwardIndex(instances, of: baseCollection,
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equalityOracle: equalityOracle, endIndex: endIndex)
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checkDecrementable(instances, of: baseCollection,
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equalityOracle: equalityOracle, startIndex: startIndex, ${trace})
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_checkIncrementalAdvance(instances, of: baseCollection,
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equalityOracle: equalityOracle, limit: startIndex,
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sign: -1, next: { baseCollection.index(before: $0) }, ${trace})
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}
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/// Test that the elements of `instances` satisfy the semantic requirements of
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/// index for `RandomAccessCollection`, using `advanceOracle` and
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/// 'distanceOracle' to generate expectations about the results of
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/// `advanced(by:)` and `distance(to:)` from pairs of positions in `instances`
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/// and `distances`.
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///
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/// - Precondition:
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/// - all elements of `instances` are reachable from `startIndex`.
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/// - `endIndex` is reachable from all elements of `instances`.
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public func checkRandomAccessIndex<
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Instances : Collection,
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Distances : Collection,
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BaseCollection : RandomAccessIndexable
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where
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Instances.Iterator.Element == BaseCollection.Index,
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Distances.Iterator.Element == BaseCollection.IndexDistance,
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// FIXME(compiler limitation): these constraints should be applied to
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// associated types of Collection.
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Instances.Indices.Iterator.Element == Instances.Index,
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Distances.Indices.Iterator.Element == Distances.Index
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>(
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_ instances: Instances, distances: Distances,
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of baseCollection: BaseCollection,
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distanceOracle:
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(Instances.Index, Instances.Index) -> Distances.Iterator.Element,
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advanceOracle:
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(Instances.Index, Distances.Index) -> Instances.Iterator.Element,
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startIndex: Instances.Iterator.Element,
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endIndex: Instances.Iterator.Element,
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${TRACE}
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) {
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checkBidirectionalIndex(instances, of: baseCollection,
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equalityOracle: { distanceOracle($0, $1) == 0 },
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startIndex: startIndex, endIndex: endIndex, ${trace})
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checkAdvancesAndDistances(
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instances, distances: distances,
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of: baseCollection,
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distanceOracle: distanceOracle,
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advanceOracle: advanceOracle, ${trace})
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}
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// Copies what checkStrideable is doing, but instead of calling
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// advanced(by:) and distance(to:) on an Strideable's,
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// calls corresponding methods on a base collection.
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public func checkAdvancesAndDistances<
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Instances : Collection,
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Distances : Collection,
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BaseCollection : Indexable
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where
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Instances.Iterator.Element == BaseCollection.Index,
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Distances.Iterator.Element == BaseCollection.IndexDistance,
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// FIXME(compiler limitation): these constraints should be applied to
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// associated types of Collection.
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Instances.Indices.Iterator.Element == Instances.Index,
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Distances.Indices.Iterator.Element == Distances.Index
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>(
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_ instances: Instances, distances: Distances,
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of baseCollection: BaseCollection,
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distanceOracle:
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(Instances.Index, Instances.Index) -> Distances.Iterator.Element,
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advanceOracle:
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(Instances.Index, Distances.Index) -> Instances.Iterator.Element,
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${TRACE}
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) {
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checkComparable(
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instances,
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oracle: {
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let d = distanceOracle($1, $0);
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return d < 0 ? .lt : d == 0 ? .eq : .gt
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},
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${trace})
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for i in instances.indices {
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let x = instances[i]
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expectEqual(x, baseCollection.index(x, offsetBy: 0))
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for j in distances.indices {
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let y = distances[j]
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expectEqual(advanceOracle(i, j), baseCollection.index(x, offsetBy: y))
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}
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for j in instances.indices {
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let y = instances[j]
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expectEqual(distanceOracle(i, j), baseCollection.distance(from: x, to: y))
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}
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}
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}
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// Generate two overloads: one for Array (which will get
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// picked up when the caller passes a literal), and another that
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// accepts any appropriate Collection type.
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% for genericParam, Element, Expected in [
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% ('Expected: Collection', 'Expected.Iterator.Element', 'Expected'),
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% ('Element' , 'Element' , 'Array<Element>')]:
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% for Traversal in TRAVERSALS:
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% TraversalCollection = collectionForTraversal(Traversal)
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public func check${Traversal}Collection<
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${genericParam}, C : ${TraversalCollection}
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where
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C.Iterator.Element == ${Element},
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C.Indices.Iterator.Element == C.Index
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>(
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_ expected: ${Expected}, _ collection: C,
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${TRACE},
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resiliencyChecks: CollectionMisuseResiliencyChecks = .all,
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sameValue: (${Element}, ${Element}) -> Bool
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) {
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// A `Collection` is a multi-pass `Sequence`.
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for _ in 0..<3 {
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checkSequence(
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expected, collection, ${trace},
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resiliencyChecks: resiliencyChecks, sameValue: sameValue)
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}
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let succ = { collection.index(after: $0) }
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% if Traversal != 'Forward':
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let pred = { collection.index(before: $0) }
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% end
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// Advances up to 1 positions without passing endIndex. Don't use
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// advanced(by: n) to do this because it's under test here.
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let next = { $0 == collection.endIndex ? $0 : succ($0) }
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// advances up to 5 positions without passing endIndex. Picking a
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// small constant to avoid complexity explosion on large input
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// collections.
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let next5 = { next(next(next(next(next($0))))) }
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let partWay0 = next5(collection.startIndex)
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let partWay1 = next5(partWay0)
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% if Traversal == 'Forward':
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let instances = _allIndices(into: collection,
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in: collection.startIndex..<partWay0)
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checkForwardIndex(instances, of: collection,
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equalityOracle: { $0 == $1 }, endIndex: partWay1, ${trace})
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% elif Traversal == 'Bidirectional':
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let instances = _allIndices(into: collection, in: partWay0..<partWay1)
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checkBidirectionalIndex(instances, of: collection,
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equalityOracle: { $0 == $1 },
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startIndex: collection.startIndex,
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endIndex: next5(partWay1), ${trace})
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% else:
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% assert(Traversal == 'RandomAccess')
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typealias Distance = C.IndexDistance
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let count: Distance = collection.count
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let offset0 = min(5, count)
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let offset1 = min(10, count)
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let offset2 = min(15, count)
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let distanceCandidates: [Distance] = [
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-11, -7, -5, -3, -2, -1, 0, 1, 2, 3, 5, 7, 11]
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let distances = distanceCandidates.filter { (x: Distance) -> Bool in
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x + offset0 >= 0 && x + offset1 <= count
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}
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func nextN(_ n: Distance, _ i: C.Index) -> C.Index {
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return collection.index(i, offsetBy: n)
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}
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let instances = _allIndices(into: collection, in: partWay0..<partWay1)
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checkRandomAccessIndex(
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instances,
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distances: distances,
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of: collection,
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distanceOracle: { (x:Int, y:Int) in numericCast(y - x) },
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advanceOracle: { x, y in nextN(distances[y], instances[x]) },
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startIndex: collection.startIndex,
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endIndex: next5(partWay1), ${trace})
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% end
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let expectedArray = Array(expected)
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expectEqual(
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expectedArray.count.toIntMax(), collection.count.toIntMax(), ${trace})
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for _ in 0..<3 {
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do {
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let startIndex = collection.startIndex
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let endIndex = collection.endIndex
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for _ in collection.indices {
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expectEqual(
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startIndex, collection.startIndex,
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"Iteration should not change startIndex",
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stackTrace: ${stackTrace})
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expectEqual(
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endIndex, collection.endIndex,
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"Iteration should not change endIndex",
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stackTrace: ${stackTrace})
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}
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}
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var allIndices = Array(collection.indices)
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if expectedArray.count >= 2 {
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for i in 0..<allIndices.count-1 {
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let successor1 = succ(allIndices[i])
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var successor2 = allIndices[i]
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successor2 = succ(successor2)
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var successor3 = allIndices[i]
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successor3 = succ(successor3)
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for s in [ successor1, successor2, successor3 ] {
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expectEqual(allIndices[i + 1], s, ${trace})
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expectEqual(
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expectedArray[i + 1], collection[s], ${trace}, sameValue: sameValue)
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}
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}
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% if Traversal == "Bidirectional":
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for i in 1..<allIndices.count {
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let predecessor1 = pred(allIndices[i])
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var predecessor2 = allIndices[i]
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predecessor2 = pred(predecessor2)
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var predecessor3 = allIndices[i]
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predecessor3 = pred(predecessor3)
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for p in [ predecessor1, predecessor2, predecessor3 ] {
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expectEqual(allIndices[i - 1], p, ${trace})
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expectEqual(
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expectedArray[i - 1], collection[p], ${trace}, sameValue: sameValue)
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}
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}
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for i in 1..<allIndices.count {
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let index = succ(pred(allIndices[i]))
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expectEqual(allIndices[i], index, ${trace})
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expectEqual(
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expectedArray[i], collection[index], ${trace}, sameValue: sameValue)
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}
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% end
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} // end of `if expectedArray.count >= 2`
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do {
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var allIndices2: [C.Index] = []
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for i in collection.indices {
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allIndices2.append(i)
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}
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expectEqualSequence(
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allIndices, allIndices2, "iteration should not invalidate indices",
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stackTrace: ${stackTrace})
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expectEqualSequence(
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expectedArray, allIndices.map { collection[$0] },
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stackTrace: ${stackTrace}, sameValue: sameValue)
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expectEqualSequence(
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expectedArray, allIndices2.map { collection[$0] },
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stackTrace: ${stackTrace}, sameValue: sameValue)
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}
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} // end of `for _ in 0..<3`
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|
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// FIXME: more checks for bidirectional and random access collections.
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}
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|
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public func check${Traversal}Collection<
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${genericParam}, C : ${TraversalCollection}
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|
where
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C.Iterator.Element == ${Element},
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C.Indices.Iterator.Element == C.Index,
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${Element} : Equatable
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>(
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_ expected: ${Expected}, _ collection: C,
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|
${TRACE},
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resiliencyChecks: CollectionMisuseResiliencyChecks = .all
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) {
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check${Traversal}Collection(
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expected, collection, ${trace},
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resiliencyChecks: resiliencyChecks) { $0 == $1 }
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}
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|
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% end
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|
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// FIXME: merge into checkCollection()
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public func checkSliceableWithBidirectionalIndex<
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${genericParam}, S : BidirectionalCollection
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where
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S.Iterator.Element == ${Element},
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S.Indices.Iterator.Element == S.Index,
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S.SubSequence : BidirectionalCollection,
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S.SubSequence.Iterator.Element == ${Element},
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S.SubSequence.Indices.Iterator.Element == S.SubSequence.Index,
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${Element} : Equatable
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>(
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_ expected: ${Expected}, _ sliceable: S, ${TRACE}
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) {
|
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// A `Sliceable` is a `Collection`.
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checkBidirectionalCollection(expected, sliceable, ${trace})
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let expectedArray = Array(expected)
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let succ = { sliceable.index(after: $0) }
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let pred = { sliceable.index(before: $0) }
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var start = sliceable.startIndex
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for startNumericIndex in 0...expectedArray.count {
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if start != sliceable.endIndex {
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start = succ(start)
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start = pred(start)
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start = succ(start)
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start = pred(start)
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}
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var end = start
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for endNumericIndex in startNumericIndex...expectedArray.count {
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if end != sliceable.endIndex {
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end = succ(end)
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end = pred(end)
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end = succ(end)
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end = pred(end)
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}
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let expectedSlice = expectedArray[startNumericIndex..<endNumericIndex]
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|
let slice = sliceable[start..<end]
|
|
|
|
checkBidirectionalCollection(expectedSlice, slice, ${trace})
|
|
|
|
if end != sliceable.endIndex {
|
|
end = succ(end)
|
|
}
|
|
}
|
|
if start != sliceable.endIndex {
|
|
start = succ(start)
|
|
}
|
|
}
|
|
}
|
|
|
|
% end
|
|
|
|
|
|
public func checkRangeReplaceable<
|
|
C : RangeReplaceableCollection,
|
|
N : Collection
|
|
where
|
|
C.Iterator.Element : Equatable,
|
|
C.Iterator.Element == N.Iterator.Element,
|
|
C.Indices.Iterator.Element == C.Index
|
|
>(
|
|
_ makeCollection: () -> C,
|
|
_ makeNewValues: (Int) -> N
|
|
) {
|
|
typealias A = C
|
|
|
|
// First make an independent copy of the array that we can use for
|
|
// comparison later.
|
|
let source = Array<A.Iterator.Element>(makeCollection())
|
|
|
|
for (ix, i) in source.indices.enumerated() {
|
|
for (jx_, j) in (i..<source.endIndex).enumerated() {
|
|
let jx = jx_ + ix
|
|
|
|
let oldCount = jx - ix
|
|
for newCount in 0..<(2 * oldCount) {
|
|
let newValues = makeNewValues(newCount)
|
|
|
|
func reportFailure(_ a: inout A, _ message: String) {
|
|
print("\(message) when replacing indices \(ix)...\(jx)")
|
|
print(" in \(Array(source)) with \(Array(newValues))")
|
|
print(" yielding \(Array(a))")
|
|
print("====================================")
|
|
expectTrue(false)
|
|
}
|
|
|
|
var a = makeCollection()
|
|
|
|
a.replaceSubrange(nthIndex(a, ix)..<nthIndex(a, jx), with: newValues)
|
|
let growth = newCount - oldCount
|
|
|
|
let expectedCount = source.count + growth
|
|
let actualCount = numericCast(a.count) as Int
|
|
if actualCount != expectedCount {
|
|
reportFailure(
|
|
&a, "\(actualCount) != expected count \(expectedCount)")
|
|
}
|
|
|
|
for (kx, k) in a.indices.enumerated() {
|
|
let expectedValue = kx < ix ? nth(source, kx)
|
|
: kx < jx + growth ? nth(newValues, kx - ix)
|
|
: nth(source, kx - growth)
|
|
|
|
if a[k] != expectedValue {
|
|
reportFailure(
|
|
&a,
|
|
// FIXME: why do we need to break this string into two parts?
|
|
"a[\(kx)] = "
|
|
+ "\(a[k]) != expected value \(expectedValue)")
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
public func checkCollection<
|
|
C : Collection,
|
|
Expected : Collection
|
|
where
|
|
C.Iterator.Element == Expected.Iterator.Element
|
|
>(
|
|
_ subject: C,
|
|
expected: Expected,
|
|
${TRACE},
|
|
resiliencyChecks: CollectionMisuseResiliencyChecks = .all,
|
|
sameValue: (Expected.Iterator.Element, Expected.Iterator.Element) -> Bool
|
|
) {
|
|
}
|
|
|