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//===--- Utils.swift ------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 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
//
//===----------------------------------------------------------------------===//
extension Dictionary {
@inline(__always)
mutating func withValue<R>(
for key: Key, default defaultValue: Value, body: (inout Value) throws -> R
) rethrows -> R {
try body(&self[key, default: defaultValue])
}
mutating func insertValue(
_ newValue: @autoclosure () -> Value, for key: Key
) -> Bool {
if self[key] == nil {
self[key] = newValue()
return true
}
return false
}
}
extension Sequence {
func sorted<T: Comparable>(by keyPath: KeyPath<Element, T>) -> [Element] {
sorted(by: { $0[keyPath: keyPath] < $1[keyPath: keyPath] })
}
}
extension String {
init(utf8 buffer: UnsafeRawBufferPointer) {
guard !buffer.isEmpty else {
self = ""
return
}
self = String(unsafeUninitializedCapacity: buffer.count,
initializingUTF8With: { dest in
_ = dest.initialize(from: buffer)
return buffer.count
})
}
init(utf8 buffer: UnsafeBufferPointer<UInt8>) {
self.init(utf8: UnsafeRawBufferPointer(buffer))
}
init(utf8 slice: Slice<UnsafeRawBufferPointer>) {
self = String(utf8: .init(rebasing: slice))
}
init(utf8 buffer: ByteScanner.Bytes) {
self = buffer.withUnsafeBytes(String.init(utf8:))
}
func scanningUTF8<R>(_ scan: (inout ByteScanner) throws -> R) rethrows -> R {
var tmp = self
return try tmp.withUTF8 { utf8 in
var scanner = ByteScanner(utf8)
return try scan(&scanner)
}
}
func tryDropPrefix(_ prefix: String) -> String? {
guard hasPrefix(prefix) else { return nil }
return String(dropFirst(prefix.count))
}
func escaped(addQuotesIfNeeded: Bool) -> String {
scanningUTF8 { scanner in
var needsQuotes = false
let result = scanner.consumeWhole { consumer in
switch consumer.peek {
case "\\", "\"":
consumer.append(Byte(ascii: "\\"))
case " ", "$": // $ is potentially a variable reference
needsQuotes = true
default:
break
}
}
let escaped = result.isUnchanged ? self : String(utf8: result)
return addQuotesIfNeeded && needsQuotes ? "\"\(escaped)\"" : escaped
}
}
var escaped: String {
escaped(addQuotesIfNeeded: true)
}
init(_ str: StaticString) {
self = str.withUTF8Buffer { utf8 in
String(utf8: utf8)
}
}
var isASCII: Bool {
// Thanks, @testable interface!
_classify()._isASCII
}
/// A more efficient version of replacingOccurrences(of:with:)/replacing(_:with:),
/// since the former involves bridging, and the latter currently has no fast
/// paths for strings.
func replacing(_ other: String, with replacement: String) -> String {
guard !other.isEmpty else {
return self
}
guard isASCII else {
// Not ASCII, fall back to slower method.
return replacingOccurrences(of: other, with: replacement)
}
let otherUTF8 = other.utf8
return scanningUTF8 { scanner in
let bytes = scanner.consumeWhole { consumer in
guard otherUTF8.count <= consumer.remaining.count else {
// If there's no way we can eat the string, eat the remaining.
consumer.eatRemaining()
return
}
while consumer.trySkip(otherUTF8) {
consumer.append(utf8: replacement)
}
}
return bytes.isUnchanged ? self : String(utf8: bytes)
}
}
}
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