| 1 | using Microsoft.CodeAnalysis; |
| 2 | using Microsoft.CodeAnalysis.Text; |
| 3 | |
| 4 | namespace CascadeIDE.Services; |
| 5 | |
| 6 | public sealed partial class CSharpLanguageService |
| 7 | { |
| 8 | public sealed record DefinitionLocation(string FilePath, int Line, int Column); |
| 9 | |
| 10 | /// <summary>Go-to-definition target for Roslyn fast path (1-based line/column).</summary> |
| 11 | public DefinitionLocation? TryGetDefinitionLocation( |
| 12 | string filePath, |
| 13 | string sourceText, |
| 14 | int line, |
| 15 | int column, |
| 16 | CancellationToken ct = default) |
| 17 | { |
| 18 | if (string.IsNullOrEmpty(filePath) || line < 1 || column < 1) |
| 19 | return null; |
| 20 | |
| 21 | try |
| 22 | { |
| 23 | var text = SourceText.From(sourceText); |
| 24 | var model = GetOrCreateModel(filePath, text, ct); |
| 25 | var lines = text.Lines; |
| 26 | if (line > lines.Count) |
| 27 | return null; |
| 28 | |
| 29 | var lineInfo = lines[line - 1]; |
| 30 | var position = lineInfo.Start + Math.Min(Math.Max(0, column - 1), lineInfo.Span.Length); |
| 31 | var root = model.SyntaxTree.GetRoot(ct); |
| 32 | var token = root.FindToken(position, findInsideTrivia: true); |
| 33 | ISymbol? symbol = null; |
| 34 | for (var node = token.Parent; node is not null; node = node.Parent) |
| 35 | { |
| 36 | var info = model.GetSymbolInfo(node, ct); |
| 37 | symbol = info.Symbol ?? info.CandidateSymbols.FirstOrDefault(); |
| 38 | if (symbol is not null) |
| 39 | break; |
| 40 | } |
| 41 | |
| 42 | if (symbol?.Locations.FirstOrDefault() is not { } location) |
| 43 | return null; |
| 44 | if (location.SourceTree is null) |
| 45 | return null; |
| 46 | |
| 47 | var defPath = location.SourceTree.FilePath; |
| 48 | if (string.IsNullOrWhiteSpace(defPath)) |
| 49 | defPath = filePath; |
| 50 | |
| 51 | var linePos = location.GetLineSpan().StartLinePosition; |
| 52 | return new DefinitionLocation( |
| 53 | defPath, |
| 54 | linePos.Line + 1, |
| 55 | linePos.Character + 1); |
| 56 | } |
| 57 | catch |
| 58 | { |
| 59 | return null; |
| 60 | } |
| 61 | } |
| 62 | } |
| 63 | |