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SemanticTokenRepresentation + async/await
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167 changes: 167 additions & 0 deletions
167
Sources/LanguageServerProtocol/SemanticTokenRepresentation.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,167 @@ | ||
| import Foundation | ||
|
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| public struct Token: Codable, Hashable, Sendable { | ||
| public let range: LSPRange | ||
| public let tokenType: String | ||
| public let modifiers: Set<String> | ||
|
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| public init(range: LSPRange, tokenType: String, modifiers: Set<String> = Set()) { | ||
| self.range = range | ||
| self.tokenType = tokenType | ||
| self.modifiers = modifiers | ||
| } | ||
| } | ||
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| @available(macOS 10.15, iOS 13.0, watchOS 6.0, tvOS 13.0, *) | ||
| public actor SemanticTokenRepresentation { | ||
| public private(set) var lastResultId: String? | ||
| private var data: [UInt32] | ||
| public let legend: SemanticTokensLegend | ||
| public let textDocument: TextDocumentIdentifier | ||
| public let server: Server | ||
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| public init(legend: SemanticTokensLegend, textDocument: TextDocumentIdentifier, server: Server) { | ||
| self.lastResultId = nil | ||
| self.data = [] | ||
| self.legend = legend | ||
| self.textDocument = textDocument | ||
| self.server = server | ||
| } | ||
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| public nonisolated func tokens(in range: LSPRange, supportsDeltas: Bool = true) async throws -> [Token] { | ||
| let tokensResponse = try await requestTokens(supportsDeltas: supportsDeltas) | ||
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| _ = await handleResponse(tokensResponse) | ||
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| let tokenData = await self.data | ||
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| return decodeTokens(from: tokenData, in: range) | ||
| } | ||
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| private func requestTokens(supportsDeltas: Bool) async throws -> SemanticTokensDeltaResponse { | ||
| if let resultId = self.lastResultId, supportsDeltas { | ||
| let params = SemanticTokensDeltaParams(textDocument: textDocument, previousResultId: resultId) | ||
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| return try await self.server.semanticTokensFullDelta(params: params) | ||
| } | ||
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| let params = SemanticTokensParams(textDocument: textDocument) | ||
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| // translate to a delta response first so we can use a uniform handler for both cases | ||
| return try await server.semanticTokensFull(params: params) | ||
| .map({ .optionA($0) }) | ||
| } | ||
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| private func handleResponse(_ response: SemanticTokensDeltaResponse) -> [LSPRange] { | ||
| switch response { | ||
| case .optionA(let fullResponse): | ||
| return applyFull(fullResponse) | ||
| case .optionB(let delta): | ||
| return applyDelta(delta) | ||
| case nil: | ||
| return [] | ||
| } | ||
| } | ||
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| private func applyFull(_ full: SemanticTokens) -> [LSPRange] { | ||
| self.lastResultId = full.resultId | ||
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| let minLength = min(data.count, full.data.count) | ||
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| var diffStartIndex = 0 | ||
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| for _ in 0..<minLength { | ||
| if data[diffStartIndex] != full.data[diffStartIndex] { | ||
| break | ||
| } | ||
|
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| diffStartIndex += 1 | ||
| } | ||
|
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| let diffRange = diffStartIndex..<data.count | ||
|
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| if diffRange.isEmpty && data.count > 0 { | ||
| return [] | ||
| } | ||
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| let diffValues = full.data.suffix(from: diffStartIndex) | ||
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| self.data.replaceSubrange(diffRange, with: diffValues) | ||
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| return [] | ||
| } | ||
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| private func applyDelta(_ delta: SemanticTokensDelta) -> [LSPRange] { | ||
| self.lastResultId = delta.resultId | ||
|
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| // sort high to low | ||
| let descendingEdits = delta.edits.sorted(by: {a, b in a.start > b.start }) | ||
|
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| for edit in descendingEdits { | ||
| let start = Int(edit.start) | ||
| let end = Int(edit.start + edit.deleteCount) | ||
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| let newData = edit.data ?? [] | ||
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| data.replaceSubrange(start..<end, with: newData) | ||
| } | ||
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| return [] | ||
| } | ||
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| private nonisolated func lspRange(within dataRange: Range<Int>) -> LSPRange { | ||
| return LSPRange(startPair: (0, 0), endPair: (0, 0)) | ||
| } | ||
|
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| private nonisolated func makeToken(range: LSPRange, typeIndex: Int) -> Token? { | ||
| guard typeIndex < legend.tokenTypes.endIndex else { | ||
| return nil | ||
| } | ||
|
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| let tokenType = legend.tokenTypes[typeIndex] | ||
|
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| return Token(range: range, tokenType: tokenType, modifiers: Set()) | ||
| } | ||
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| private nonisolated func decodeTokens(from data: [UInt32], in range: LSPRange) -> [Token] { | ||
| var lastLine: Int? | ||
| var lastStartChar: Int? | ||
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| var tokens = [Token]() | ||
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| for i in stride(from: 0, to: data.count, by: 5) { | ||
| let lineDelta = Int(data[i]) | ||
| let startingLine = lastLine ?? 0 | ||
| let line = startingLine + lineDelta | ||
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| lastLine = line | ||
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| let charDelta = Int(data[i+1]) | ||
| let startingChar = lastStartChar ?? 0 | ||
| let startChar = (lineDelta == 0 ? startingChar : 0) + charDelta | ||
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| lastStartChar = startChar | ||
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| let length = Int(data[i+2]) | ||
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| let start = Position(line: line, character: startChar) | ||
| if start >= range.end { | ||
| break | ||
| } | ||
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| let end = Position(line: line, character: startChar + length) | ||
| if end < range.start { | ||
| continue | ||
| } | ||
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| let tokenRange = LSPRange(start: start, end: end) | ||
| let typeIndex = Int(data[i+3]) | ||
|
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| if let token = makeToken(range: tokenRange, typeIndex: typeIndex) { | ||
| tokens.append(token) | ||
| } | ||
| } | ||
|
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| return tokens | ||
| } | ||
| } |
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