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//===--- StringUTF8StorageProperty.swift ----------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2025 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
//
//===----------------------------------------------------------------------===//
// RUN: %target-run-stdlib-swift
// REQUIRES: executable_test
import StdlibUnittest
var suite = TestSuite("StringUTF8StorageProperty")
defer { runAllTests() }
suite.test("Span from Small String")
.require(.stdlib_6_2).code {
guard #available(SwiftStdlib 6.2, *) else { return }
var s = "123456789".utf8
let u = Array(s)
#if os(watchOS) && _pointerBitWidth(_32)
expectNil(s._span)
#endif
var string = String(s)
string.reserveCapacity(12)
s = (consume string).utf8
guard let span = expectNotNil(s._span) else { return }
let count = span.count
expectEqual(count, s.count)
for i in span.indices {
expectEqual(span[i], u[i])
}
}
suite.test("Span from Large Native String")
.require(.stdlib_6_2).code {
guard #available(SwiftStdlib 6.2, *) else { return }
let s = "A long string that is altogether not smol.".utf8
let u = Array(s)
guard let span = expectNotNil(s._span) else { return }
let count = span.count
expectEqual(count, s.count)
for i in span.indices {
expectEqual(span[i], u[i])
}
}
suite.test("Span from Small String's Substring")
.require(.stdlib_6_2).code {
guard #available(SwiftStdlib 6.2, *) else { return }
let s = "A small string.".dropFirst(8).utf8
let u = Array("string.".utf8)
guard let span = expectNotNil(s._span) else { return }
let count = span.count
expectEqual(count, s.count)
for i in span.indices {
expectEqual(span[i], u[i])
}
}
suite.test("Span from Large Native String's Substring")
.require(.stdlib_6_2).code {
guard #available(SwiftStdlib 6.2, *) else { return }
let t = "A long string that is altogether not smol."
let s = t.dropFirst(22).prefix(10).utf8
let u = Array("altogether".utf8)
guard let span = expectNotNil(s._span) else { return }
let count = span.count
expectEqual(count, s.count)
for i in span.indices {
expectEqual(span[i], u[i])
}
}
suite.test("Span from String.utf8Span")
.require(.stdlib_6_2).code {
guard #available(SwiftStdlib 6.2, *) else { return }
let s = String(200)
guard let utf8span = expectNotNil(s._utf8Span) else { return }
let span1 = utf8span.span
let utf8view = s.utf8
guard let span2 = expectNotNil(utf8view._span) else { return }
expectEqual(span1.count, span2.count)
for (i,j) in zip(span1.indices, span2.indices) {
expectEqual(span1[i], span2[j])
}
}
suite.test("UTF8Span from Span")
.require(.stdlib_6_2).code {
guard #available(SwiftStdlib 6.2, *) else { return }
let s = String(200).utf8
guard let span1 = expectNotNil(s._span) else { return }
guard let utf8 = expectNotNil(try? UTF8Span(validating: span1)) else { return }
let span2 = utf8.span
expectTrue(span1.isIdentical(to: span2))
}
suite.test("Span from Substring.utf8Span")
.require(.stdlib_6_2).code {
guard #available(SwiftStdlib 6.2, *) else { return }
let s = String(22000).dropFirst().dropLast()
guard let utf8span = expectNotNil(s._utf8Span) else { return }
let span1 = utf8span.span
let utf8view = s.utf8
guard let span2 = expectNotNil(utf8view._span) else { return }
expectEqual(span1.count, span2.count)
for (i,j) in zip(span1.indices, span2.indices) {
expectEqual(span1[i], span2[j])
}
}
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