provide goto definition for import strings

src/analysis.zig

@@ -262,13 +262,14 @@ fn resolveReturnType(analysis_ctx: *AnalysisContext, fn_decl: *ast.Node.FnProto)
         // If this is a type function and it only contains a single return statement that returns
         // a container declaration, we will return that declaration.
         const ret = findReturnStatement(fn_decl.body_node.?) orelse return null;
-        if (ret.rhs) |rhs| if (resolveTypeOfNode(analysis_ctx, rhs)) |res_rhs| switch(res_rhs.id) {
+        if (ret.rhs) |rhs|
-            .ContainerDecl => {
+            if (resolveTypeOfNode(analysis_ctx, rhs)) |res_rhs| switch (res_rhs.id) {
-                analysis_ctx.onContainer(res_rhs.cast(ast.Node.ContainerDecl).?) catch return null;
+                .ContainerDecl => {
-                return res_rhs;
+                    analysis_ctx.onContainer(res_rhs.cast(ast.Node.ContainerDecl).?) catch return null;
-            },
+                    return res_rhs;
-            else => return null,
+                },
-        };
+                else => return null,
+            };
 
         return null;
     }
@@ -557,3 +558,34 @@ pub fn declsFromIndex(decls: *std.ArrayList(*ast.Node), tree: *ast.Tree, index:
         }
     }
 }
+
+fn nodeContainsSourceIndex(tree: *ast.Tree, node: *ast.Node, source_index: usize) bool {
+    const first_token = tree.tokens.at(node.firstToken());
+    const last_token = tree.tokens.at(node.lastToken());
+    return source_index >= first_token.start and source_index <= last_token.end;
+}
+
+pub fn getImportStr(tree: *ast.Tree, source_index: usize) ?[]const u8 {
+    var node = &tree.root_node.base;
+    var index: usize = 0;
+    while (node.iterate(index)) |child| {
+        if (!nodeContainsSourceIndex(tree, child, source_index)) {
+            index += 1;
+            continue;
+        }
+        if (child.cast(ast.Node.BuiltinCall)) |builtin_call| blk: {
+            const call_name = tree.tokenSlice(builtin_call.builtin_token);
+
+            if (!std.mem.eql(u8, call_name, "@import")) break :blk;
+            if (builtin_call.params.len != 1) break :blk;
+
+            const import_param = builtin_call.params.at(0).*;
+            const import_str_node = import_param.cast(ast.Node.StringLiteral) orelse break :blk;
+            const import_str = tree.tokenSlice(import_str_node.token);
+            return import_str[1 .. import_str.len - 1];
+        }
+        node = child;
+        index = 0;
+    }
+    return null;
+}

src/document_store.zig

@@ -216,7 +216,7 @@ pub fn applyChanges(
     try self.removeOldImports(handle, zig_lib_path);
 }
 
-fn uriFromImportStr(
+pub fn uriFromImportStr(
     store: *DocumentStore,
     allocator: *std.mem.Allocator,
     handle: Handle,
@@ -371,7 +371,7 @@ pub const AnalysisContext = struct {
     }
 };
 
-fn stdUriFromLibPath(allocator: *std.mem.Allocator, zig_lib_path: ?[]const u8) !?[]const u8 {
+pub fn stdUriFromLibPath(allocator: *std.mem.Allocator, zig_lib_path: ?[]const u8) !?[]const u8 {
     if (zig_lib_path) |zpath| {
         const std_path = std.fs.path.resolve(allocator, &[_][]const u8{
             zpath, "./std/std.zig",

src/main.zig

@@ -365,10 +365,36 @@ fn gotoDefinitionFieldAccess(
     try respondGeneric(id, null_result_response);
 }
 
-fn completeGlobal(id: i64, pos_index: usize, handle: *DocumentStore.Handle, config: Config) !void {
+fn gotoDefinitionString(id: i64, pos_index: usize, handle: *DocumentStore.Handle, config: Config) !void {
     var tree = try handle.tree(allocator);
     defer tree.deinit();
 
+    var arena = std.heap.ArenaAllocator.init(allocator);
+    defer arena.deinit();
+
+    const import_str = analysis.getImportStr(tree, pos_index) orelse return try respondGeneric(id, null_result_response);
+    const uri =  (try document_store.uriFromImportStr(
+        &arena.allocator,
+        handle.*,
+        import_str,
+        try DocumentStore.stdUriFromLibPath(&arena.allocator, config.zig_lib_path),
+    )) orelse return try respondGeneric(id, null_result_response);
+
+    try send(types.Response{
+        .id = .{ .Integer = id },
+        .result = .{
+            .Location = .{
+                .uri = uri,
+                .range = .{
+                    .start = .{ .line = 0, .character = 0 },
+                    .end = .{ .line = 0, .character = 0 },
+                },
+            },
+        },
+    });
+}
+
+fn completeGlobal(id: i64, pos_index: usize, handle: *DocumentStore.Handle, config: Config) !void {
     // 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);
@@ -382,7 +408,7 @@ fn completeGlobal(id: i64, pos_index: usize, handle: *DocumentStore.Handle, conf
     defer analysis_ctx.deinit();
 
     var decl_nodes = std.ArrayList(*std.zig.ast.Node).init(&arena.allocator);
-    try analysis.declsFromIndex(&decl_nodes, tree, pos_index);
+    try analysis.declsFromIndex(&decl_nodes, analysis_ctx.tree, pos_index);
     for (decl_nodes.items) |decl_ptr| {
         var decl = decl_ptr.*;
         try nodeToCompletion(&completions, &analysis_ctx, decl_ptr, config);
@@ -805,6 +831,7 @@ fn processJsonRpc(parser: *std.json.Parser, json: []const u8, config: Config) !v
                     start_idx,
                     configFromUriOr(uri, config),
                 ),
+                .string_literal => try gotoDefinitionString(id, pos_index, handle, config),
                 else => try respondGeneric(id, null_result_response),
             }
         }