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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
//
//===----------------------------------------------------------------------===//
import LanguageServerProtocol
import SwiftSyntax
fileprivate class StartOfIdentifierFinder: SyntaxAnyVisitor {
let requestedPosition: AbsolutePosition
var resolvedPosition: AbsolutePosition?
init(position: AbsolutePosition) {
self.requestedPosition = position
super.init(viewMode: .sourceAccurate)
}
override func visitAny(_ node: Syntax) -> SyntaxVisitorContinueKind {
if (node.position...node.endPosition).contains(requestedPosition) {
return .visitChildren
}
return .skipChildren
}
override func visit(_ token: TokenSyntax) -> SyntaxVisitorContinueKind {
if token.tokenKind.isPunctuation || token.tokenKind == .endOfFile {
return .skipChildren
}
if (token.positionAfterSkippingLeadingTrivia...token.endPositionBeforeTrailingTrivia).contains(requestedPosition) {
self.resolvedPosition = token.positionAfterSkippingLeadingTrivia
}
return .skipChildren
}
}
extension SwiftLanguageService {
/// VS Code considers the position after an identifier as part of an identifier. Ie. if you have `let foo| = 1`, then
/// it considers the cursor to be positioned at the identifier. This scenario is hit, when selecting an identifier by
/// double-clicking it and then eg. performing jump-to-definition. In that case VS Code will send the position after
/// the identifier.
/// `sourcekitd`, on the other hand, does not consider the position after the identifier as part of the identifier.
/// To bridge the gap here, normalize any positions inside, or directly after, an identifier to the identifier's
/// start.
func adjustPositionToStartOfIdentifier(
_ position: Position,
in snapshot: DocumentSnapshot
) async -> Position {
let tree = await self.syntaxTreeManager.syntaxTree(for: snapshot)
let visitor = StartOfIdentifierFinder(position: snapshot.absolutePosition(of: position))
visitor.walk(tree)
if let resolvedPosition = visitor.resolvedPosition {
return snapshot.position(of: resolvedPosition)
}
return position
}
}
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