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Rewrite FixItApplier to be string based
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
| //===----------------------------------------------------------------------===// | ||
| // | ||
| // 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 SwiftDiagnostics | ||
| import SwiftSyntax | ||
|
|
||
| public enum FixItApplier { | ||
| fileprivate struct Edit: Equatable { | ||
| let startUtf8Offset: Int | ||
| let endUtf8Offset: Int | ||
| let replacement: String | ||
|
|
||
| var replacementLength: Int { | ||
| return replacement.utf8.count | ||
| } | ||
| } | ||
|
|
||
| /// Applies selected or all Fix-Its from the provided diagnostics to a given syntax tree. | ||
| /// | ||
| /// - Parameters: | ||
| /// - diagnostics: An array of `Diagnostic` objects, each containing one or more Fix-Its. | ||
| /// - filterByMessages: An optional array of message strings to filter which Fix-Its to apply. | ||
| /// If `nil`, all Fix-Its in `diagnostics` are applied. | ||
| /// - tree: The syntax tree to which the Fix-Its will be applied. | ||
| /// | ||
| /// - Returns: A ``String`` representation of the modified syntax tree after applying the Fix-Its. | ||
| public static func applyFixes( | ||
| from diagnostics: [Diagnostic], | ||
| filterByMessages messages: [String]?, | ||
| to tree: any SyntaxProtocol | ||
| ) -> String { | ||
| let messages = messages ?? diagnostics.compactMap { $0.fixIts.first?.message.message } | ||
|
|
||
| let changes = | ||
| diagnostics | ||
| .flatMap(\.fixIts) | ||
| .filter { messages.contains($0.message.message) } | ||
| .flatMap(\.changes) | ||
|
|
||
| var edits: [Edit] = [] | ||
|
|
||
| for change in changes { | ||
| switch change { | ||
| case .replace(let oldNode, let newNode): | ||
| edits.append( | ||
| Edit( | ||
| startUtf8Offset: oldNode.position.utf8Offset, | ||
| endUtf8Offset: oldNode.endPosition.utf8Offset, | ||
| replacement: newNode.description | ||
| ) | ||
| ) | ||
|
|
||
| case .replaceLeadingTrivia(let token, let newTrivia): | ||
| edits.append( | ||
| Edit( | ||
| startUtf8Offset: token.position.utf8Offset, | ||
| endUtf8Offset: token.endPosition.utf8Offset, | ||
| replacement: token.with(\.leadingTrivia, newTrivia).description | ||
| ) | ||
| ) | ||
|
|
||
| case .replaceTrailingTrivia(let token, let newTrivia): | ||
| edits.append( | ||
| Edit( | ||
| startUtf8Offset: token.position.utf8Offset, | ||
| endUtf8Offset: token.endPosition.utf8Offset, | ||
| replacement: token.with(\.trailingTrivia, newTrivia).description | ||
| ) | ||
| ) | ||
| } | ||
| } | ||
|
|
||
| var source = tree.description | ||
| var editedOffset = 0 | ||
|
|
||
| // As we need to start apply the edits at the end of a source, start by reversing edit | ||
| // and then sort edits by decrementing start offset. If they are equal then descrementing end offset. | ||
| // edits = edits.reversed().sorted(by: { edit1, edit2 in | ||
| // if edit1.startUtf8Offset == edit2.startUtf8Offset { | ||
| // return edit1.endUtf8Offset > edit2.endUtf8Offset | ||
| // } else { | ||
| // return edit1.startUtf8Offset > edit2.startUtf8Offset | ||
| // } | ||
| // }) | ||
|
|
||
| for edit in edits where edits.canInsert(editToApply: edit) { | ||
| let startUtf8Offset = edit.startUtf8Offset + editedOffset | ||
| let endUtf8Offset = edit.endUtf8Offset + editedOffset | ||
|
|
||
| let startIndex = source.utf8.index(source.utf8.startIndex, offsetBy: startUtf8Offset) | ||
| let endIndex = source.utf8.index(source.utf8.startIndex, offsetBy: endUtf8Offset) | ||
|
|
||
| source.replaceSubrange(startIndex..<endIndex, with: edit.replacement) | ||
| editedOffset -= (endUtf8Offset - startUtf8Offset) | ||
| editedOffset += edit.replacementLength | ||
| } | ||
|
|
||
| return source | ||
| } | ||
| } | ||
|
|
||
| extension Array where Element == FixItApplier.Edit { | ||
| fileprivate func canInsert(editToApply: Element) -> Bool { | ||
| return self.contains { edit in | ||
| return !(editToApply.startUtf8Offset >= edit.startUtf8Offset | ||
| && editToApply.endUtf8Offset < edit.endUtf8Offset) | ||
| } | ||
| } | ||
| } |
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