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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2020 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
//
//===----------------------------------------------------------------------===//
#if canImport(TestSupport)
import TestSupport
#endif
#if FOUNDATION_FRAMEWORK
@testable import Foundation
#else
@testable import FoundationEssentials
#endif
extension AttributedStringProtocol {
fileprivate mutating func genericSetAttribute() {
self.testInt = 3
}
}
/// Tests for `AttributedString` to confirm expected CoW behavior
final class TestAttributedStringCOW: XCTestCase {
// MARK: - Utility Functions
func createAttributedString() -> AttributedString {
var str = AttributedString("Hello", attributes: container)
str += AttributedString(" ")
str += AttributedString("World", attributes: containerB)
return str
}
func assertCOWCopy(file: StaticString = #filePath, line: UInt = #line, _ operation: (inout AttributedString) -> Void) {
let str = createAttributedString()
var copy = str
operation(©)
XCTAssertNotEqual(str, copy, "Mutation operation did not copy when multiple references exist", file: file, line: line)
}
func assertCOWNoCopy(file: StaticString = #filePath, line: UInt = #line, _ operation: (inout AttributedString) -> Void) {
var str = createAttributedString()
let gutsPtr = Unmanaged.passUnretained(str._guts)
operation(&str)
let newGutsPtr = Unmanaged.passUnretained(str._guts)
XCTAssertEqual(gutsPtr.toOpaque(), newGutsPtr.toOpaque(), "Mutation operation copied when only one reference exists", file: file, line: line)
}
func assertCOWBehavior(file: StaticString = #filePath, line: UInt = #line, _ operation: (inout AttributedString) -> Void) {
assertCOWCopy(file: file, line: line, operation)
assertCOWNoCopy(file: file, line: line, operation)
}
func makeSubrange(_ str: AttributedString) -> Range<AttributedString.Index> {
return str.characters.index(str.startIndex, offsetBy: 2)..<str.characters.index(str.endIndex, offsetBy: -2)
}
lazy var container: AttributeContainer = {
var container = AttributeContainer()
container.testInt = 2
return container
}()
lazy var containerB: AttributeContainer = {
var container = AttributeContainer()
container.testBool = true
return container
}()
// MARK: - Tests
func testTopLevelType() {
assertCOWBehavior { (str) in
str.setAttributes(container)
}
assertCOWBehavior { (str) in
str.mergeAttributes(container)
}
assertCOWBehavior { (str) in
str.replaceAttributes(container, with: containerB)
}
assertCOWBehavior { (str) in
str.append(AttributedString("b", attributes: containerB))
}
assertCOWBehavior { (str) in
str.insert(AttributedString("b", attributes: containerB), at: str.startIndex)
}
assertCOWBehavior { (str) in
str.removeSubrange(..<str.characters.index(str.startIndex, offsetBy: 3))
}
assertCOWBehavior { (str) in
str.replaceSubrange(..<str.characters.index(str.startIndex, offsetBy: 3), with: AttributedString("b", attributes: containerB))
}
assertCOWBehavior { (str) in
str[AttributeScopes.TestAttributes.TestIntAttribute.self] = 3
}
assertCOWBehavior { (str) in
str.testInt = 3
}
assertCOWBehavior { (str) in
str.test.testInt = 3
}
}
func testSubstring() {
assertCOWBehavior { (str) in
str[makeSubrange(str)].setAttributes(container)
}
assertCOWBehavior { (str) in
str[makeSubrange(str)].mergeAttributes(container)
}
assertCOWBehavior { (str) in
str[makeSubrange(str)].replaceAttributes(container, with: containerB)
}
assertCOWBehavior { (str) in
str[makeSubrange(str)][AttributeScopes.TestAttributes.TestIntAttribute.self] = 3
}
assertCOWBehavior { (str) in
str[makeSubrange(str)].testInt = 3
}
assertCOWBehavior { (str) in
str[makeSubrange(str)].test.testInt = 3
}
}
func testCharacters() {
let char: Character = "a"
assertCOWBehavior { (str) in
str.characters.replaceSubrange(makeSubrange(str), with: "abc")
}
assertCOWBehavior { (str) in
str.characters.append(char)
}
assertCOWBehavior { (str) in
str.characters.append(contentsOf: "abc")
}
assertCOWBehavior { (str) in
str.characters.append(contentsOf: [char, char, char])
}
assertCOWBehavior { (str) in
str.characters[str.startIndex] = "A"
}
assertCOWBehavior { (str) in
str.characters[makeSubrange(str)].append("a")
}
}
func testUnicodeScalars() {
let scalar: UnicodeScalar = "a"
assertCOWBehavior { (str) in
str.unicodeScalars.replaceSubrange(makeSubrange(str), with: [scalar, scalar])
}
}
func testGenericProtocol() {
assertCOWBehavior {
$0.genericSetAttribute()
}
assertCOWBehavior {
$0[makeSubrange($0)].genericSetAttribute()
}
}
}
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