mirror of
https://github.com/apple/swift.git
synced 2025-12-21 12:14:44 +01:00
1187890ca4
* [SwiftSyntax] Fix SyntaxChildren iteration SyntaxChildren.Iterator stops the first time it sees a nil child; since it traverses all indexes without considering presence, this causes it to terminate iteration early if there is a missing child in the list. * [SwiftSyntax] Add tests for SyntaxChildren
37 lines
1.1 KiB
Swift
37 lines
1.1 KiB
Swift
//===------------- SyntaxChildren.swift - Syntax Child Iterator -----------===//
|
|
//
|
|
// This source file is part of the Swift.org open source project
|
|
//
|
|
// Copyright (c) 2014 - 2017 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
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
import Foundation
|
|
|
|
public struct SyntaxChildren: Sequence {
|
|
public struct Iterator: IteratorProtocol {
|
|
let node: Syntax
|
|
var indexIterator: Syntax.PresentChildIndicesSequence.Iterator
|
|
|
|
init(node: Syntax) {
|
|
self.indexIterator = node.presentChildIndices.makeIterator()
|
|
self.node = node
|
|
}
|
|
|
|
public mutating func next() -> Syntax? {
|
|
guard let index = indexIterator.next() else { return nil }
|
|
return node.child(at: index)
|
|
}
|
|
}
|
|
|
|
let node: Syntax
|
|
|
|
public func makeIterator() -> SyntaxChildren.Iterator {
|
|
return Iterator(node: node)
|
|
}
|
|
}
|