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cca27d02a0
Keep calm: remember that the standard library has many more public exports than the average target, and that this contains ALL of them at once. I also deliberately tried to tag nearly every top-level decl, even if that was just to explicitly mark things @internal, to make sure I didn't miss something. This does export more than we might want to, mostly for protocol conformance reasons, along with our simple-but-limiting typealias rule. I tried to also mark things private where possible, but it's really going to be up to the standard library owners to get this right. This is also only validated against top-level access control; I haven't fully tested against member-level access control yet, and none of our semantic restrictions are in place. Along the way I also noticed bits of stdlib cruft; to keep this patch understandable, I didn't change any of them. Swift SVN r19145
72 lines
2.0 KiB
Swift
72 lines
2.0 KiB
Swift
//===--- Map.swift - Lazily map the elements of a Sequence ---------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2015 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See http://swift.org/LICENSE.txt for license information
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// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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@public struct MapSequenceGenerator<Base: Generator, T>: Generator, Sequence {
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@public mutating func next() -> T? {
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let x = _base.next()
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if x {
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return _transform(x!)
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}
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return nil
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}
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@public func generate() -> MapSequenceGenerator {
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return self
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}
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var _base: Base
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var _transform: (Base.Element)->T
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}
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@public struct MapSequenceView<Base: Sequence, T> : Sequence {
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@public func generate() -> MapSequenceGenerator<Base.GeneratorType,T> {
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return MapSequenceGenerator(
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_base: _base.generate(), _transform: _transform)
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}
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var _base: Base
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var _transform: (Base.GeneratorType.Element)->T
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}
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@public struct MapCollectionView<Base: Collection, T> : Collection {
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@public var startIndex: Base.IndexType {
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return _base.startIndex
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}
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@public var endIndex: Base.IndexType {
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return _base.endIndex
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}
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@public subscript(index: Base.IndexType) -> T {
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return _transform(_base[index])
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}
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@public func generate() -> MapSequenceView<Base, T>.GeneratorType {
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return MapSequenceGenerator(_base: _base.generate(), _transform: _transform)
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}
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var _base: Base
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var _transform: (Base.GeneratorType.Element)->T
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}
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@public func map<S:Sequence, T>(
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source: S, transform: (S.GeneratorType.Element)->T
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) -> MapSequenceView<S, T> {
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return MapSequenceView(_base: source, _transform: transform)
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}
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@public func map<C:Collection, T>(
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source: C, transform: (C.GeneratorType.Element)->T
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) -> MapCollectionView<C, T> {
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return MapCollectionView(_base: source, _transform: transform)
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}
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