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[test] Make string internal testing a little more robust; NFC

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Add an isSmall query to Character so testing doesn't have to bake in
internal format. Clarify the purpose of the invalid UTF-16 backdoor
creation method.
This commit is contained in:
Michael Ilseman
2018-08-02 15:47:07 -07:00
parent df7c76f7da
commit ced2e63d95
5 changed files with 18 additions and 21 deletions
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13
stdlib/public/core/StringGuts.swift
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@@ -1255,19 +1255,6 @@ extension _StringGuts {
}
}
extension _StringGuts {
// For testing purposes only. Might be both inefficient and too low-level.
// There should be an eventual API on String to accomplish something similar.
@usableFromInline // @_testable
static internal
func _createStringFromUTF16(_ cus: UnsafeBufferPointer<UInt16>) -> String {
let storage = _SwiftStringStorage<UTF16.CodeUnit>.create(
capacity: cus.count, count: cus.count)
_ = storage._initialize(fromCodeUnits: cus, encoding: UTF16.self)
return String(_StringGuts(_large: storage))
}
}
extension _SwiftStringStorage {
/// Initialize a piece of freshly allocated storage instance from a sequence
/// of code units, which is assumed to contain exactly as many code units as