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[String] NFC iterator fast-paths

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Refactor and rename _StringGutsSlice, apply NFC-aware fast paths to a
new buffered iterator.

Also, fix bug in _typeName which used to assume ASCIIness and better
SIL optimizations on StringObject.
This commit is contained in:
Michael Ilseman
2018-10-28 15:47:49 -07:00
parent 7376009ccc
commit 7aea40680d
27 changed files with 716 additions and 285 deletions
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9
stdlib/public/core/StringCharacterView.swift
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@@ -51,7 +51,9 @@ extension String: BidirectionalCollection {
/// The number of characters in a string.
public var count: Int {
@inline(__always) get { return distance(from: startIndex, to: endIndex) }
@inline(__always) get {
return distance(from: startIndex, to: endIndex)
}
}
/// Returns the position immediately after the given index.
@@ -83,8 +85,7 @@ extension String: BidirectionalCollection {
// TODO: known-ASCII fast path, single-scalar-grapheme fast path, etc.
let stride = _characterStride(endingAt: i)
let priorOffset = i.encodedOffset &- stride
return Index(
encodedOffset: priorOffset, characterStride: stride)
return Index(encodedOffset: priorOffset, characterStride: stride)
}
/// Returns an index that is the specified distance from the given index.
///
@@ -244,7 +245,7 @@ extension String {
// ICU treats isolated surrogates as isolated graphemes
if distance == 1 {
return Character(
String(_guts.foreignErrorCorrectedScalar(startingAt: position)))
String(_guts.foreignErrorCorrectedScalar(startingAt: position).0))
}
let start = position.encodedOffset