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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2023 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
//
//===----------------------------------------------------------------------===//
extension RawSyntax {
/// A view into the ``RawSyntax`` that exposes functionality that's specific to layout nodes.
/// The token's payload must be a layout, otherwise this traps.
@_spi(RawSyntax)
public var layoutView: RawSyntaxLayoutView? {
switch raw.payload {
case .parsedToken, .materializedToken:
return nil
case .layout:
return RawSyntaxLayoutView(raw: self)
}
}
}
/// A view into ``RawSyntax`` that exposes functionality that only applies to layout nodes.
@_spi(RawSyntax)
public struct RawSyntaxLayoutView {
private let raw: RawSyntax
fileprivate init(raw: RawSyntax) {
self.raw = raw
switch raw.payload {
case .parsedToken, .materializedToken:
preconditionFailure("RawSyntax must be a layout")
case .layout(_):
break
}
}
private var layoutData: RawSyntaxData.Layout {
switch raw.rawData.payload {
case .parsedToken(_),
.materializedToken(_):
preconditionFailure("RawSyntax must be a layout")
case .layout(let dat):
return dat
}
}
var recursiveFlags: RecursiveRawSyntaxFlags {
return layoutData.recursiveFlags
}
/// Creates a new node of the same kind but with children replaced by `elements`.
///
/// The newly created syntax node is allocated in `arena`.
@_spi(RawSyntax)
public func replacingLayout(
with elements: some Collection<RawSyntax?>,
arena: SyntaxArena
) -> RawSyntax {
return .makeLayout(
kind: raw.kind,
uninitializedCount: elements.count,
arena: arena
) { buffer in
if buffer.isEmpty { return }
_ = buffer.initialize(from: elements)
}
}
@_spi(RawSyntax)
public func insertingChild(
_ newChild: RawSyntax?,
at index: Int,
arena: SyntaxArena
) -> RawSyntax {
precondition(children.count >= index)
return .makeLayout(
kind: raw.kind,
uninitializedCount: children.count + 1,
arena: arena
) { buffer in
var childIterator = children.makeIterator()
let base = buffer.baseAddress!
for i in 0..<buffer.count {
base.advanced(by: i)
.initialize(to: i == index ? newChild : childIterator.next()!)
}
}
}
@_spi(RawSyntax)
public func removingChild(
at index: Int,
arena: SyntaxArena
) -> RawSyntax {
precondition(children.count > index)
let count = children.count - 1
return .makeLayout(
kind: raw.kind,
uninitializedCount: count,
arena: arena
) { buffer in
if buffer.isEmpty { return }
let newBase = buffer.baseAddress!
let oldBase = children.baseAddress!
// Copy elements up to the index.
newBase.initialize(from: oldBase, count: index)
// Copy elements from the index + 1.
newBase.advanced(by: index)
.initialize(
from: oldBase.advanced(by: index + 1),
count: children.count - index - 1
)
}
}
@_spi(RawSyntax)
public func appending(_ newChild: RawSyntax?, arena: SyntaxArena) -> RawSyntax {
insertingChild(newChild, at: children.count, arena: arena)
}
@_spi(RawSyntax)
public func replacingChildSubrange(
_ range: Range<Int>,
with elements: some Collection<RawSyntax?>,
arena: SyntaxArena
) -> RawSyntax {
precondition(!raw.isToken)
let newCount = children.count - range.count + elements.count
return .makeLayout(
kind: raw.kind,
uninitializedCount: newCount,
arena: arena
) { buffer in
if buffer.isEmpty { return }
var current = buffer.baseAddress!
// Initialize
current.initialize(from: children.baseAddress!, count: range.lowerBound)
current = current.advanced(by: range.lowerBound)
for elem in elements {
current.initialize(to: elem)
current += 1
}
current.initialize(
from: children.baseAddress!.advanced(by: range.upperBound),
count: children.count - range.upperBound
)
}
}
@_spi(RawSyntax)
public func replacingChild(
at index: Int,
with newChild: RawSyntax?,
arena: SyntaxArena
) -> RawSyntax {
precondition(!raw.isToken && children.count > index)
return .makeLayout(
kind: raw.kind,
uninitializedCount: children.count,
arena: arena
) { buffer in
_ = buffer.initialize(from: children)
buffer[index] = newChild
}
}
@_spi(RawSyntax)
public func formLayoutArray() -> [RawSyntax?] {
Array(children)
}
/// Child nodes.
@_spi(RawSyntax)
public var children: RawSyntaxBuffer {
layoutData.layout
}
}
|
