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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2021-2022 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
//
//===----------------------------------------------------------------------===//
/*
Pull in shims and other things so our code is closer to the
stdlib's and vice versa. Long term, we'll want to address
each of these
*/
func _internalInvariant(
_ b: @autoclosure () -> Bool, _ s: String = ""
) {
assert(b(), s)
}
extension Optional {
internal var _unsafelyUnwrappedUnchecked: Wrapped {
self.unsafelyUnwrapped
}
internal mutating func _take() -> Wrapped? {
switch self {
case .some(let thing):
self = nil
return thing
case .none:
return nil
}
}
}
// Don't use UnsafeRawBufferPointer for anything important
struct UnsafeByteBuffer {
var pointer: UnsafeRawPointer
var count: Int
func boundsCheck(_ idx: Int) -> Bool {
idx < count
}
subscript(_unchecked idx: Int) -> UInt8 {
assert(boundsCheck(idx))
return pointer.load(fromByteOffset: idx, as: UInt8.self)
}
subscript(idx: Int) -> UInt8 {
precondition(boundsCheck(idx))
return self[_unchecked: idx]
}
}
extension UnsafeBufferPointer where Element == UInt8 {
var byteBuffer: UnsafeByteBuffer {
UnsafeByteBuffer(pointer: baseAddress.unsafelyUnwrapped, count: count)
}
}
extension Unicode.Scalar {
init(_unchecked v: UInt32) {
self.init(v)!
}
init(_value v: UInt32) {
self = unsafeBitCast(v, to: Self.self)
}
}
// TODO: This actually might be good module API fodder
extension UTF16 {
//@inlinable @inline(__always)
internal static func _decodeSurrogates(
_ lead: CodeUnit,
_ trail: CodeUnit
) -> Unicode.Scalar {
_internalInvariant(isLeadSurrogate(lead))
_internalInvariant(isTrailSurrogate(trail))
return Unicode.Scalar(
_unchecked: 0x10000 +
(UInt32(lead & 0x03ff) &<< 10 | UInt32(trail & 0x03ff)))
}
}
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