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[stdlib] indexing model: Interval/Range merge

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This is step 1; we still need to introduce ClosedRange.
This commit is contained in:
Dave Abrahams
2016-03-16 15:57:35 -07:00
parent 8c5cf9b4fc
commit f493b54e44
49 changed files with 431 additions and 633 deletions
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8
stdlib/public/core/StringCharacterView.swift
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@@ -267,7 +267,7 @@ extension String.CharacterView : RangeReplaceableCollection {
///
/// Invalidates all indices with respect to `self`.
///
/// - Complexity: O(`bounds.count`) if `bounds.endIndex
/// - Complexity: O(`bounds.count`) if `bounds.upperBound
/// == self.endIndex` and `newElements.isEmpty`, O(N) otherwise.
public mutating func replaceSubrange<
C: Collection where C.Iterator.Element == Character
@@ -275,8 +275,8 @@ extension String.CharacterView : RangeReplaceableCollection {
bounds: Range<Index>, with newElements: C
) {
let rawSubRange: Range<Int> =
bounds.startIndex._base._position
..< bounds.endIndex._base._position
bounds.lowerBound._base._position
..< bounds.upperBound._base._position
let lazyUTF16 = newElements.lazy.flatMap { $0.utf16 }
_core.replaceSubrange(rawSubRange, with: lazyUTF16)
}
@@ -328,7 +328,7 @@ extension String.CharacterView {
/// O(N) conversion.
public subscript(bounds: Range<Index>) -> String.CharacterView {
let unicodeScalarRange =
bounds.startIndex._base..<bounds.endIndex._base
bounds.lowerBound._base..<bounds.upperBound._base
return String.CharacterView(
String(_core).unicodeScalars[unicodeScalarRange]._core)
}