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53ec0b1168
CharacterView was not Hashable, so Set could not be used as an accumulator. String and Substring are Hashable, but using a Set as an accumulator is still slower than first collecting all the results in an Array and then transforming it to a Set at the end. One possible reason why that could be the case, is that by the time conversion happens, we already know the capacity and thus will not re-allocate and re-hash a Set on every insertion beyong current capacity.
76 lines
1.8 KiB
Swift
76 lines
1.8 KiB
Swift
//===--- StringEdits.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 - 2017 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 https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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import TestsUtils
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#if os(Linux)
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import Glibc
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#else
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import Darwin
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#endif
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public let StringEdits = BenchmarkInfo(
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name: "StringEdits",
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runFunction: run_StringEdits,
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tags: [.validation, .api, .String])
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var editWords: [String] = [
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"woodshed",
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"lakism",
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"gastroperiodynia",
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]
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let alphabet = "abcdefghijklmnopqrstuvwxyz"
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/// All edits that are one edit away from `word`
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func edits(_ word: String) -> Set<String> {
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let splits = word.indices.map {
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(String(word[..<$0]), String(word[$0...]))
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}
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var result: Array<String> = []
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for (left, right) in splits {
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// drop a character
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result.append(left + right.dropFirst())
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// transpose two characters
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if let fst = right.first {
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let drop1 = right.dropFirst()
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if let snd = drop1.first {
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result.append(left + [snd,fst] + drop1.dropFirst())
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}
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}
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// replace each character with another
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for letter in alphabet {
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result.append(left + [letter] + right.dropFirst())
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}
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// insert rogue characters
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for letter in alphabet {
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result.append(left + [letter] + right)
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}
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}
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// have to map back to strings right at the end
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return Set(result)
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}
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@inline(never)
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public func run_StringEdits(_ N: Int) {
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for _ in 1...N*100 {
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for word in editWords {
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_ = edits(word)
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}
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}
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}
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