super basic completion, tons of things to iron out

src/main.zig

@@ -298,27 +298,53 @@ fn completeGlobal(id: i64, document: *types.TextDocument, config: Config) !void
     });
 }
 
-fn completeFieldAccess(id: i64, document: *types.TextDocument, index: usize, config: Config) !void {
-    var tree = try std.zig.parse(allocator, sane_text);
-    defer tree.deinit();
+fn completeFieldAccess(id: i64, document: *types.TextDocument, position: types.Position, config: Config) !void {
+    if (document.sane_text) |sane_text| {
+        var tree = try std.zig.parse(allocator, sane_text);
+        defer tree.deinit();
 
-    // We use a local arena allocator to deallocate all temporary data without iterating
-    var arena = std.heap.ArenaAllocator.init(allocator);
-    var completions = std.ArrayList(types.CompletionItem).init(&arena.allocator);
-    // Deallocate all temporary data.
-    defer arena.deinit();
+        // We use a local arena allocator to deallocate all temporary data without iterating
+        var arena = std.heap.ArenaAllocator.init(allocator);
+        var completions = std.ArrayList(types.CompletionItem).init(&arena.allocator);
+        // Deallocate all temporary data.
+        defer arena.deinit();
 
-    try log("{}", .{});
+        var line = try document.getLine(@intCast(usize, position.line));
+        try log("{}", .{line});
+        var tokenizer = std.zig.Tokenizer.init(line);
 
-    try send(types.Response{
-        .id = .{.Integer = id},
-        .result = .{
-            .CompletionList = .{
-                .isIncomplete = false,
-                .items = completions.items,
+        if (analysis.getNodeFromTokens(tree, &tree.root_node.base, &tokenizer)) |node| {
+            var index: usize = 0;
+            while (node.iterate(index)) |child_node| {
+                try completions.append(.{
+                    .label = analysis.nodeToString(tree, child_node),
+                    .kind = .Variable, 
+                });
+    
+                index += 1;
+            }
+        }
+
+        try send(types.Response{
+            .id = .{.Integer = id},
+            .result = .{
+                .CompletionList = .{
+                    .isIncomplete = false,
+                    .items = completions.items,
+                },
             },
-        },
-    });
+        });
+    } else {
+        return try send(types.Response{
+            .id = .{.Integer = id},
+            .result = .{
+                .CompletionList = .{
+                    .isIncomplete = false,
+                    .items = &[_]types.CompletionItem{},
+                },
+            },
+        });
+    }
 }
 
 // Compute builtin completions at comptime.
@@ -588,7 +614,7 @@ fn processJsonRpc(parser: *std.json.Parser, json: []const u8, config: Config) !v
             } else if (pos_context == .var_access or pos_context == .empty) {
                 try completeGlobal(id, document, config);
             } else if (pos_context == .field_access) {
-                try completeFieldAccess(id, document, pos_index, config);
+                try completeFieldAccess(id, document, pos, config);
             } else {
                 try respondGeneric(id, no_completions_response);
             }

src/types.zig

@@ -158,6 +158,18 @@ pub const TextDocument = struct {
 
         return @intCast(usize, index);
     }
+
+    pub fn getLine(self: TextDocument, target_line: usize) ![]const u8 {
+        var split_iterator = std.mem.split(self.text, "\n");
+
+        var line: i64 = 0;
+        while (line < target_line) : (line += 1) {
+            _ = split_iterator.next() orelse return error.InvalidParams;
+        }
+        if (split_iterator.next()) |next| {
+            return next;
+        } else return error.InvalidParams;
+    }
 };
 
 pub const TextEdit = struct {