Added find references handler

src/main.zig

@@ -10,6 +10,7 @@ const requests = @import("requests.zig");
 const types = @import("types.zig");
 const analysis = @import("analysis.zig");
 const URI = @import("uri.zig");
+const references = @import("references.zig");
 const rename = @import("rename.zig");
 const offsets = @import("offsets.zig");
 
@@ -740,6 +741,44 @@ fn renameDefinitionLabel(arena: *std.heap.ArenaAllocator, id: types.RequestId, h
     });
 }
 
+fn referencesDefinitionGlobal(arena: *std.heap.ArenaAllocator, id: types.RequestId, handle: *DocumentStore.Handle, pos_index: usize, include_decl: bool) !void {
+    const decl = (try getSymbolGlobal(arena, pos_index, handle)) orelse return try respondGeneric(id, null_result_response);
+    var locs = std.ArrayList(types.Location).init(&arena.allocator);
+    try references.symbolReferences(arena, &document_store, decl, offset_encoding, include_decl, &locs, std.ArrayList(types.Location).append);
+    try send(arena, types.Response{
+        .id = id,
+        .result = .{ .Locations = locs.items },
+    });
+}
+
+fn referencesDefinitionFieldAccess(
+    arena: *std.heap.ArenaAllocator,
+    id: types.RequestId,
+    handle: *DocumentStore.Handle,
+    position: offsets.DocumentPosition,
+    range: analysis.SourceRange,
+    include_decl: bool,
+    config: Config,
+) !void {
+    const decl = (try getSymbolFieldAccess(handle, arena, position, range, config)) orelse return try respondGeneric(id, null_result_response);
+    var locs = std.ArrayList(types.Location).init(&arena.allocator);
+    try references.symbolReferences(arena, &document_store, decl, offset_encoding, include_decl, &locs, std.ArrayList(types.Location).append);
+    try send(arena, types.Response{
+        .id = id,
+        .result = .{ .Locations = locs.items },
+    });
+}
+
+fn referencesDefinitionLabel(arena: *std.heap.ArenaAllocator, id: types.RequestId, handle: *DocumentStore.Handle, pos_index: usize, include_decl: bool) !void {
+    const decl = (try getLabelGlobal(pos_index, handle)) orelse return try respondGeneric(id, null_result_response);
+    var locs = std.ArrayList(types.Location).init(&arena.allocator);
+    try references.labelReferences(arena, decl, offset_encoding, include_decl, &locs, std.ArrayList(types.Location).append);
+    try send(arena, types.Response{
+        .id = id,
+        .result = .{ .Locations = locs.items },
+    });
+}
+
 const DeclToCompletionContext = struct {
     completions: *std.ArrayList(types.CompletionItem),
     config: *const Config,
@@ -1260,7 +1299,7 @@ fn formattingHandler(arena: *std.heap.ArenaAllocator, id: types.RequestId, req:
 
 fn renameHandler(arena: *std.heap.ArenaAllocator, id: types.RequestId, req: requests.Rename, config: Config) !void {
     const handle = document_store.getHandle(req.params.textDocument.uri) orelse {
-        std.log.debug(.main, "Trying to got to definition in non existent document {}", .{req.params.textDocument.uri});
+        std.log.debug(.main, "Trying to rename in non existent document {}", .{req.params.textDocument.uri});
         return try respondGeneric(id, null_result_response);
     };
 
@@ -1280,6 +1319,29 @@ fn renameHandler(arena: *std.heap.ArenaAllocator, id: types.RequestId, req: requ
     }
 }
 
+fn referencesHandler(arena: *std.heap.ArenaAllocator, id: types.RequestId, req: requests.References, config: Config) !void {
+    const handle = document_store.getHandle(req.params.textDocument.uri) orelse {
+        std.log.debug(.main, "Trying to get references in non existent document {}", .{req.params.textDocument.uri});
+        return try respondGeneric(id, null_result_response);
+    };
+
+    if (req.params.position.character >= 0) {
+        const doc_position = try offsets.documentPosition(handle.document, req.params.position, offset_encoding);
+        const pos_context = try analysis.documentPositionContext(arena, handle.document, doc_position);
+
+        const this_config = configFromUriOr(req.params.textDocument.uri, config);
+        const include_decl = req.params.context.includeDeclaration;
+        switch (pos_context) {
+            .var_access => try referencesDefinitionGlobal(arena, id, handle, doc_position.absolute_index, include_decl),
+            .field_access => |range| try referencesDefinitionFieldAccess(arena, id, handle, doc_position, range, include_decl, this_config),
+            .label => try referencesDefinitionLabel(arena, id, handle, doc_position.absolute_index, include_decl),
+            else => try respondGeneric(id, null_result_response),
+        }
+    } else {
+        try respondGeneric(id, null_result_response);
+    }
+}
+
 // Needed for the hack seen below.
 fn extractErr(val: var) anyerror {
     val catch |e| return e;
@@ -1327,6 +1389,7 @@ fn processJsonRpc(arena: *std.heap.ArenaAllocator, parser: *std.json.Parser, jso
         .{ "textDocument/documentSymbol", requests.DocumentSymbols, documentSymbolsHandler },
         .{ "textDocument/formatting", requests.Formatting, formattingHandler },
         .{ "textDocument/rename", requests.Rename, renameHandler },
+        .{ "textDocument/references", requests.References, referencesHandler },
     };
 
     // Hack to avoid `return`ing in the inline for, which causes bugs.

src/requests.zig

@@ -209,10 +209,12 @@ pub const Rename = struct {
     },
 };
 
-pub const Reference = struct {
+pub const References = struct {
     params: struct {
         textDocument: TextDocumentIdentifier,
         position: types.Position,
+        context: struct {
             includeDeclaration: bool,
         },
+    },
 };

src/types.zig

@@ -18,11 +18,13 @@ pub const Object = json.ObjectMap;
 pub const DocumentUri = String;
 
 pub const Position = struct {
-    line: Integer, character: Integer,
+    line: Integer,
+    character: Integer,
 };
 
 pub const Range = struct {
-    start: Position, end: Position,
+    start: Position,
+    end: Position,
 };
 
 pub const Location = struct {
@@ -56,6 +58,7 @@ pub const ResponseParams = union(enum) {
     DocumentSymbols: []DocumentSymbol,
     SemanticTokens: struct { data: []const u32 },
     TextEdits: []TextEdit,
+    Locations: []Location,
     WorkspaceEdit: WorkspaceEdit,
 };