╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ web.zig ──────────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯
🬐 🬠 🬞🬂🬏 🬟 🬑 🬟 🬑 ╭9cd00aac..╮ 9cd00aac.. haxy: 🬋🬋🬋 🬋🬋🬋 🬋 🬋 │files │ commits refs discuss issues patches new login 🬐 🬠 🬐 🬠 🬑 🬟 🬰 ╰──────────╯ (699) user
╭────╮ ╭ clone ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─╮ │http│ ssh │ │ ╰────╯ ╰ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─╯
.. embed/ event/ test/ ui/ command.zig diff3.zig event.zig find.zig fork.zig lib.zig main.zig main_wasm.zig markdown.zig notify.zig patch.zig progress.zig push.zig search.zig search_commit.zig search_thread.zig serve.zig serve_common.zig serve_http.zig serve_ssh.zig serve_ssh_protocol.zig test.zig testnet.zig try.zig ui.zig ╭─────────────────────────────────╮ │web.zig │ ╰─────────────────────────────────╯
2350 var page = try ui.Page.init(session.page_arena, &session, session.data.current_page); 2351 var root = try ui.initRoot(allocator, &page, &session); 2352 defer root.deinit(allocator); 2353 2354 const snapshot: ui.Snapshot = .{ .page = page, .session = session.data }; 2355 2356 const content = try generateHtml(allocator, &root, &session); 2357 defer allocator.free(content); 2358 2359 // serialize the snapshot so the wasm side can parse it back without making 2360 // a second request. it's embedded raw in a <script type="application/json"> 2361 // block, whose content is raw text terminated only by "</script". in json, 2362 // '<' appears solely inside string values, so escaping every '<' (and '>' 2363 // for good measure) to its \uXXXX form yields equivalent json that can't 2364 // break out of the tag. 2365 var json: std.Io.Writer.Allocating = .init(allocator); 2366 defer json.deinit(); 2367 try std.json.Stringify.value(snapshot, .{}, &json.writer); 2368 2369 var json_escaped: std.ArrayList(u8) = .empty; 2370 defer json_escaped.deinit(allocator); 2371 for (json.written()) |c| switch (c) { 2372 '<' => try json_escaped.appendSlice(allocator, "\\u003c"), 2373 '>' => try json_escaped.appendSlice(allocator, "\\u003e"), 2374 else => try json_escaped.append(allocator, c), 2375 }; 2376 2377 var out: std.ArrayList(u8) = .empty; 2378 errdefer out.deinit(allocator); 2379 { 2380 var cursor: usize = 0; 2381 for (&[_]struct { needle: []const u8, replacement: []const u8 }{ 2382 .{ .needle = "{{{ HAXY_HTML }}}", .replacement = content }, 2383 .{ .needle = "{{{ HAXY_JSON }}}", .replacement = json_escaped.items }, 2384 }) |sub| { 2385 const idx = std.mem.indexOfPos(u8, template, cursor, sub.needle) orelse return error.MissingTemplateToken; 2386 try out.appendSlice(allocator, template[cursor..idx]); 2387 try out.appendSlice(allocator, sub.replacement); 2388 cursor = idx + sub.needle.len; 2389 } 2390 try out.appendSlice(allocator, template[cursor..]); 2391 } 2392 return try out.toOwnedSlice(allocator); 2393 } 2394 2395 fn findEmbed(request_path: []const u8) ?Embed { 2396 // embeds are matched before pages, so a dot keeps them from claiming a username or tab 2397 comptime for (embeds) |embed| { 2398 if (std.mem.indexOfScalar(u8, embed.path, '.') == null) @compileError("embed path needs a '.' so it can't shadow a page: " ++ embed.path); 2399 }; 2400 if (request_path.len < 2 or request_path[0] != '/') return null; 2401 const path = request_path[1..]; 2402 2403 for (embeds) |embed| { 2404 if (std.mem.eql(u8, path, embed.path)) return embed; 2405 } 2406 return null; 2407 } 2408 2409 // emits the TUI grid cells as static HTML. each web-native Scroll becomes its 2410 // own absolutely-positioned, natively-scrollable <div> holding its full content, 2411 // rendered recursively so nested scrolls work. 2412 pub fn generateHtml(allocator: std.mem.Allocator, root: *ui.Widget, session: *ui.Session) ![]const u8 { 2413 const grid = root.getGrid() orelse return error.MissingGrid; 2414 const root_focus = root.getFocus(); 2415 2416 var out: std.ArrayList(u8) = .empty; 2417 errdefer out.deinit(allocator); 2418 2419 switch (root.*) { 2420 .background => |*background| { 2421 if (background.art.getGrid()) |art| { 2422 try out.print(allocator, "<div class=\"ansi-art\" aria-hidden=\"true\" style=\"left:{d}ch;opacity:{d}%\">", .{ grid.size.width -| art.size.width, ui.widget.AnsiBackground.art_opacity }); 2423 try renderPanel(allocator, &out, background.art.getFocus(), art, session, root_focus); 2424 try out.appendSlice(allocator, "</div>"); 2425 } 2426 }, 2427 else => {}, 2428 } 2429 try out.appendSlice(allocator, "<div class=\"grid-content\" data-key=\"panel:root\">"); 2430 try renderPanel(allocator, &out, root_focus, grid, session, root_focus); 2431 try out.appendSlice(allocator, "</div>"); 2432 try renderForms(allocator, &out, root_focus); 2433 return try out.toOwnedSlice(allocator); 2434 } 2435 2436 // render one panel — a focus subtree and its content grid — as HTML, recursing 2437 // once per web-native Scroll inside it. the root panel is the whole page; each 2438 // Scroll becomes a nested, natively-scrollable div holding its full content. 2439 // emits the panel's grid cells as text, leaving holes where child scrolls sit, 2440 // then the child scroll divs over those holes. 2441 fn renderPanel(allocator: std.mem.Allocator, output: *std.ArrayList(u8), focus: *Focus, grid: Grid, session: *ui.Session, root_focus: *Focus) !void { 2442 // `direct` is this panel's scroll children, each drawn as an overlaid div. 2443 // `excluded` is every focus id that belongs to a scroll (the scroll nodes 2444 // plus their descendants, which the focus tree flattens into this panel's 2445 // children): the cell hit-test below skips them so this panel doesn't claim 2446 // cells that are really rendered inside a child scroll's own panel. 2447 // (scrolls aren't nested in practice, so every scroll child is direct here.) 2448 var direct: std.ArrayList(usize) = .empty; 2449 defer direct.deinit(allocator); 2450 var excluded: std.AutoHashMapUnmanaged(usize, void) = .empty; 2451 defer excluded.deinit(allocator); 2452 { 2453 var it = focus.children.iterator(); 2454 while (it.next()) |e| { 2455 if (e.value_ptr.focus.scroll == null) continue; 2456 try direct.append(allocator, e.key_ptr.*); 2457 try excluded.put(allocator, e.key_ptr.*, {}); 2458 var mit = e.value_ptr.focus.children.iterator(); 2459 while (mit.next()) |m| try excluded.put(allocator, m.key_ptr.*, {}); 2460 } 2461 } 2462 2463 // the HTML element a run of cells is wrapped in, chosen from the cell's 2464 // focusable kind 2465 const CellTag = union(enum) { 2466 span, // clickable focusable cell 2467 a: []const u8, // clickable focusable link 2468 plain, // non-focusable, colored 2469 2470 const a_prefix = "a:"; 2471 // an "in-page" anchor: rendered as a real <a href> so it works with js 2472 // disabled, but wasm handles it without navigating. 2473 fn init(str: []const u8) @This() { 2474 if (std.mem.startsWith(u8, str, ui.raw_link_prefix)) { 2475 return .{ .a = str[ui.raw_link_prefix.len..] }; 2476 } 2477 if (std.mem.startsWith(u8, str, ui.in_page_link_prefix)) { 2478 return .{ .a = str[ui.in_page_link_prefix.len..] }; 2479 } 2480 if (std.mem.startsWith(u8, str, a_prefix)) { 2481 return .{ .a = str[a_prefix.len..] }; 2482 } 2483 return .span; 2484 } 2485 2486 fn writeOpenTag(self: @This(), alloc: std.mem.Allocator, out: *std.ArrayList(u8), id: usize, style_attr: []const u8) !void { 2487 var id_buf: [32]u8 = undefined; 2488 switch (self) { 2489 .span => { 2490 try out.appendSlice(alloc, "<span class=\"clickable\" data-focus-id=\""); 2491 try out.appendSlice(alloc, try std.fmt.bufPrint(&id_buf, "{d}", .{id})); 2492 try out.appendSlice(alloc, "\""); 2493 try out.appendSlice(alloc, style_attr); 2494 try out.appendSlice(alloc, ">"); 2495 }, 2496 .a => |href| { 2497 // tabindex=-1 keeps these out of the browser's tab order 2498 try out.appendSlice(alloc, "<a class=\"clickable\" tabindex=\"-1\" data-focus-id=\""); 2499 try out.appendSlice(alloc, try std.fmt.bufPrint(&id_buf, "{d}", .{id})); 2500 try out.appendSlice(alloc, "\" href=\""); 2501 try appendEscapedHtml(alloc, out, href); 2502 try out.appendSlice(alloc, "\""); 2503 try out.appendSlice(alloc, style_attr); 2504 try out.appendSlice(alloc, ">"); 2505 }, 2506 .plain => { 2507 try out.appendSlice(alloc, "<span"); 2508 try out.appendSlice(alloc, style_attr); 2509 try out.appendSlice(alloc, ">"); 2510 }, 2511 } 2512 } 2513 2514 fn closeTag(self: @This()) []const u8 { 2515 return switch (self) { 2516 .span, .plain => "</span>", 2517 .a => "</a>", 2518 }; 2519 } 2520 }; 2521 2522 // the focusable owning each cell, among this panel's own (skipping any 2523 // that belong to a child scroll, whose cells are drawn in their own panel). 2524 // claimed in focus order, so the first focusable over a cell keeps it. 2525 // looking every focusable up for every cell is quadratic in a long list. 2526 const owners = try allocator.alloc(?usize, grid.size.width * grid.size.height); 2527 defer allocator.free(owners); 2528 @memset(owners, null); 2529 { 2530 var it = focus.children.iterator(); 2531 while (it.next()) |entry| { 2532 const child = entry.value_ptr.*; 2533 if (child.focus.mode != .all) continue; 2534 if (excluded.contains(entry.key_ptr.*)) continue; 2535 const r = child.rect; 2536 for (@min(r.y, grid.size.height)..@min(r.y + r.size.height, grid.size.height)) |y| { 2537 for (@min(r.x, grid.size.width)..@min(r.x + r.size.width, grid.size.width)) |x| { 2538 const owner = &owners[y * grid.size.width + x]; 2539 if (owner.* == null) owner.* = entry.key_ptr.*; 2540 } 2541 } 2542 } 2543 } 2544 2545 // the cells are the volatile part of a panel. js replaces this one subtree 2546 // wholesale while retaining the panel's native controls and scroll shells. 2547 try output.appendSlice(allocator, "<div class=\"grid-cells\">"); 2548 2549 // emit this panel's grid as rows of text, coalescing adjacent cells that 2550 // share a focus id and style into one tag (a clickable span, a link, or a 2551 // plain styled span). cells under a child scroll keep only their background. 2552 // a cell's own link is an anchor nested in that tag. 2553 for (0..grid.size.height) |y| { 2554 var cur_id: ?usize = null; 2555 var cur_style: Grid.Style = .{}; 2556 var open_tag: ?CellTag = null; 2557 var open_link: ?[]const u8 = null; 2558 var first = true; 2559 for (0..grid.size.width) |x| { 2560 const cell = (try grid.cell(x, y)).*; 2561 // a cell covered by a child scroll's viewport is drawn by that scroll's 2562 // own div, so blank its glyph and make it non-clickable here — but keep 2563 // its background, so the backdrop still shows through the scroll's 2564 // transparent div instead of a bare hole. 2565 const covered_by_scroll = blk: { 2566 for (direct.items) |id| { 2567 const r = (focus.children.get(id) orelse continue).rect; 2568 if (x >= r.x and y >= r.y and x < r.x + r.size.width and y < r.y + r.size.height) break :blk true; 2569 } 2570 break :blk false; 2571 }; 2572 // the focusable owning the cell at (x, y); none for a covered cell. 2573 const cell_id = if (covered_by_scroll) null else owners[y * grid.size.width + x]; 2574 const style: Grid.Style = if (covered_by_scroll) .{ .bg = cell.style.bg } else cell.style; 2575 2576 if (first or cell_id != cur_id or !style.eql(cur_style)) { 2577 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2578 open_link = null; 2579 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 2580 2581 var new_tag: ?CellTag = null; 2582 if (cell_id) |id| { 2583 if (focus.children.get(id)) |child| { 2584 new_tag = switch (child.focus.kind) { 2585 .custom => |custom| CellTag.init(custom), 2586 else => .span, 2587 }; 2588 } 2589 } 2590 if (new_tag == null and !style.eql(.{})) new_tag = .plain; 2591 2592 if (new_tag) |t| { 2593 var style_buf: [192]u8 = undefined; 2594 try t.writeOpenTag(allocator, output, cell_id orelse 0, styleAttr(&style_buf, style)); 2595 } 2596 2597 open_tag = new_tag; 2598 cur_id = cell_id; 2599 cur_style = style; 2600 first = false; 2601 } 2602 2603 // an anchor can't nest in another, so a link tag's cells skip theirs 2604 const in_anchor = if (open_tag) |t| t == .a else false; 2605 const link = if (covered_by_scroll or in_anchor) null else webLink(cell.link); 2606 if (!sameLink(link, open_link)) { 2607 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2608 if (link) |url| { 2609 // a page path opens in this tab, any other url in a new one 2610 try output.appendSlice(allocator, if (url[0] == '/') 2611 "<a class=\"cell-link\" tabindex=\"-1\" href=\"" 2612 else 2613 "<a class=\"cell-link\" tabindex=\"-1\" target=\"_blank\" rel=\"noopener noreferrer\" href=\""); 2614 try appendEscapedHtml(allocator, output, url); 2615 try output.appendSlice(allocator, "\">"); 2616 } 2617 open_link = link; 2618 } 2619 2620 if (covered_by_scroll) { 2621 try appendEscapedHtml(allocator, output, " "); 2622 } else if (cell.continuation) { 2623 // the wide rune to the left was emitted 2ch wide, covering this column 2624 } else if (cell.rune) |rune| { 2625 var encoded: [4]u8 = undefined; 2626 const encoded_len = try std.unicode.utf8Encode(rune, &encoded); 2627 const rune_text = encoded[0..encoded_len]; 2628 // a double-width rune is pinned inside a 2ch span so the 2629 // fallback glyph's advance width can't shift the rest of the row 2630 const wide = x + 1 < grid.size.width and (try grid.cell(x + 1, y)).continuation; 2631 if (wide) { 2632 try output.appendSlice(allocator, "<span class=\"w2\">"); 2633 try appendEscapedHtml(allocator, output, rune_text); 2634 try output.appendSlice(allocator, "</span>"); 2635 } else { 2636 try appendEscapedHtml(allocator, output, rune_text); 2637 } 2638 } else { 2639 try appendEscapedHtml(allocator, output, " "); 2640 } 2641 } 2642 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2643 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 2644 try output.append(allocator, '\n'); 2645 } 2646 try output.appendSlice(allocator, "</div>"); 2647 2648 // native controls live in their panel, beside the replaceable cells. their 2649 // stable keys let JS update layout without recreating their DOM nodes, and 2650 // being actual descendants of a scroll gives them native movement/clipping. 2651 try renderPanelControls(allocator, output, focus, session, root_focus, &excluded); 2652 2653 // each child scroll becomes a natively-scrollable div positioned over its 2654 // viewport, holding its full content rendered recursively. 2655 for (direct.items) |id| { 2656 const child = focus.children.get(id) orelse continue; 2657 const info = child.focus.scroll orelse continue; 2658 const r = child.rect; 2659 // overflow only on the axes the widget scrolls; `auto` shows a bar only 2660 // when that axis actually overflows. the other axis is clipped (hidden), 2661 // matching how the terminal Scroll handles its non-scrolling axis. 2662 const overflow = switch (info.direction) { 2663 .vert => "overflow-x:hidden;overflow-y:auto", 2664 .horiz => "overflow-x:auto;overflow-y:hidden", 2665 .both => "overflow:auto", 2666 }; 2667 // the id carries a content version so JS preserves the native scroll 2668 // position across re-renders of the same content but resets it when the 2669 // content is replaced — e.g. selecting a different commit. the widget's 2670 // scroll offset (in cells) rides along so JS can apply it when it has no 2671 // preserved position, letting a wasm-side scrollToRect (the files list 2672 // scrolling to its selected row on page load) reach the browser. 2673 var buf: [256]u8 = undefined; 2674 try output.appendSlice(allocator, try std.fmt.bufPrint(&buf, "<div class=\"scroll\" data-key=\"scroll:{d}\" data-scroll-id=\"{d}-{d}\" data-scroll-direction=\"{s}\" data-scroll-x=\"{d}\" data-scroll-y=\"{d}\" style=\"left:{d}ch;top:{d}em;width:{d}ch;height:{d}em;{s}\">", .{ id, id, child.focus.version, @tagName(info.direction), info.offset_x, info.offset_y, r.x, r.y, r.size.width, r.size.height, overflow })); 2675 try renderPanel(allocator, output, child.focus, info.content, session, root_focus); 2676 try output.appendSlice(allocator, "</div>"); 2677 } 2678 } 2679 2680 const form_prefix = "form:"; 2681 const form_id_prefix = "haxy-form-"; 2682 2683 fn formAction(focus: *const Focus) ?[]const u8 { 2684 return switch (focus.kind) { 2685 .custom => |custom| if (std.mem.startsWith(u8, custom, form_prefix)) custom[form_prefix.len..] else null, 2686 else => null, 2687 }; 2688 } 2689 2690 // find the form ancestor of a flattened focus-tree child. html's `form` 2691 // attribute then associates the control with that form without requiring the 2692 // form and control to share a DOM parent. 2693 fn formOwner(root_focus: *Focus, focus_id: usize) ?usize { 2694 var id = focus_id; 2695 while (root_focus.children.get(id)) |child| { 2696 const parent_id = child.parent_id; 2697 if (parent_id == root_focus.id) return if (formAction(root_focus) != null) root_focus.id else null; 2698 const parent = root_focus.children.get(parent_id) orelse return null; 2699 if (formAction(parent.focus) != null) return parent_id; 2700 id = parent_id; 2701 } 2702 return null; 2703 } 2704 2705 fn appendFormAttribute(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus, focus_id: usize) !void { 2706 const form_id = formOwner(root_focus, focus_id) orelse return; 2707 var buf: [64]u8 = undefined; 2708 try output.appendSlice(allocator, try std.fmt.bufPrint(&buf, " form=\"" ++ form_id_prefix ++ "{d}\"", .{form_id})); 2709 } 2710 2711 fn renderPanelControls( 2712 allocator: std.mem.Allocator, 2713 output: *std.ArrayList(u8), 2714 focus: *Focus, 2715 session: *ui.Session, 2716 root_focus: *Focus, 2717 excluded: *const std.AutoHashMapUnmanaged(usize, void), 2718 ) !void { 2719 var iter = focus.children.iterator(); 2720 while (iter.next()) |entry| { 2721 const id = entry.key_ptr.*; 2722 if (excluded.contains(id)) continue; 2723 const child = entry.value_ptr.*; 2724 const r = child.rect; 2725 2726 if (r.size.width == 0 or r.size.height == 0) continue; // not laid out, rather than merely off-screen 2727 2728 switch (child.focus.kind) { 2729 .text_input, .text_input_password, .text_area => { 2730 const ti = session.text_inputs.get(id) orelse continue; 2731 2732 const inner_left = r.x + 1; 2733 const inner_top = r.y + 1; 2734 const inner_width = if (r.size.width > 2) r.size.width - 2 else 0; 2735 const preserve = !ti.options.read_only; 2736 2737 if (child.focus.kind == .text_area) { 2738 const value = try ti.text(allocator); 2739 defer allocator.free(value); 2740 var id_buf: [128]u8 = undefined; 2741 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<textarea data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2742 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2743 try appendFormAttribute(allocator, output, root_focus, id); 2744 if (ti.options.name.len > 0) { 2745 try output.appendSlice(allocator, " name=\""); 2746 try appendEscapedHtml(allocator, output, ti.options.name); 2747 try output.append(allocator, '"'); 2748 } 2749 const inner_height = if (r.size.height > 2) r.size.height - 2 else 0; 2750 var pos_buf: [128]u8 = undefined; 2751 try output.appendSlice(allocator, try std.fmt.bufPrint(&pos_buf, " style=\"left:{d}ch;top:{d}em;width:{d}ch;height:{d}em\">\n", .{ inner_left, inner_top, inner_width, inner_height })); 2752 try appendEscapedHtml(allocator, output, value); 2753 try output.appendSlice(allocator, "</textarea>"); 2754 continue; 2755 } 2756 2757 var id_buf: [160]u8 = undefined; 2758 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<input type=\"{s}\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ if (child.focus.kind == .text_input_password) "password" else "text", id, id })); 2759 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2760 try appendFormAttribute(allocator, output, root_focus, id); 2761 if (ti.options.name.len > 0) { 2762 try output.appendSlice(allocator, " name=\""); 2763 try appendEscapedHtml(allocator, output, ti.options.name); 2764 try output.append(allocator, '"'); 2765 } 2766 if (child.focus.kind != .text_input_password) { 2767 const value = try ti.text(allocator); 2768 defer allocator.free(value); 2769 try output.appendSlice(allocator, " value=\""); 2770 try appendEscapedHtml(allocator, output, value); 2771 try output.append(allocator, '"'); 2772 } 2773 var pos_buf: [96]u8 = undefined; 2774 try output.appendSlice(allocator, try std.fmt.bufPrint(&pos_buf, " style=\"left:{d}ch;top:{d}em;width:{d}ch;height:1em\">", .{ inner_left, inner_top, inner_width })); 2775 }, 2776 .custom => |custom| { 2777 if (std.mem.eql(u8, custom, "submit") or std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2778 if (formOwner(root_focus, id) == null) continue; 2779 var id_buf: [128]u8 = undefined; 2780 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<button type=\"submit\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2781 try appendFormAttribute(allocator, output, root_focus, id); 2782 if (std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2783 try output.appendSlice(allocator, " formaction=\""); 2784 try appendEscapedHtml(allocator, output, custom[ui.submit_action_prefix.len..]); 2785 try output.append(allocator, '"'); 2786 } 2787 var pos_buf: [128]u8 = undefined; 2788 try output.appendSlice(allocator, try std.fmt.bufPrint(&pos_buf, " style=\"left:{d}ch;top:{d}em;width:{d}ch;height:{d}em\"></button>", .{ r.x, r.y, r.size.width, r.size.height })); 2789 } else if (std.mem.startsWith(u8, custom, ui.radio_prefix)) { 2790 // an invisible native radio over the option, checked when the option is its row's selection 2791 const field = custom[ui.radio_prefix.len..]; 2792 const separator = std.mem.indexOfScalar(u8, field, '=') orelse continue; 2793 const row = root_focus.children.get(child.parent_id) orelse continue; 2794 var id_buf: [128]u8 = undefined; 2795 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<input type=\"radio\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2796 try appendFormAttribute(allocator, output, root_focus, id); 2797 try output.appendSlice(allocator, " name=\""); 2798 try appendEscapedHtml(allocator, output, field[0..separator]); 2799 try output.appendSlice(allocator, "\" value=\""); 2800 try appendEscapedHtml(allocator, output, field[separator + 1 ..]); 2801 try output.append(allocator, '"'); 2802 if (row.focus.child_id == id) try output.appendSlice(allocator, " checked"); 2803 var pos_buf: [128]u8 = undefined; 2804 try output.appendSlice(allocator, try std.fmt.bufPrint(&pos_buf, " style=\"opacity:0;left:{d}ch;top:{d}em;width:{d}ch;height:{d}em\">", .{ r.x, r.y, r.size.width, r.size.height })); 2805 } else if (std.mem.startsWith(u8, custom, ui.file_input_prefix)) { 2806 try output.appendSlice(allocator, "<input type=\"file\" data-preserve-value data-action=\""); 2807 try appendEscapedHtml(allocator, output, custom[ui.file_input_prefix.len..]); 2808 var id_buf: [128]u8 = undefined; 2809 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "\" data-key=\"control:{d}\" data-focus-id=\"{d}\" style=\"opacity:0;left:{d}ch;top:{d}em;width:{d}ch;height:{d}em\">", .{ id, id, r.x, r.y, r.size.width, r.size.height })); 2810 } 2811 }, 2812 else => {}, 2813 } 2814 } 2815 } 2816 2817 // emit hidden form owners beside the rendered panels. their controls point 2818 // back here with the standard HTML `form` attribute. 2819 fn renderForms(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus) !void { 2820 // the focus child map preserves insertion order, which matches the order 2821 // widgets were added in code 2822 var iter = root_focus.children.iterator(); 2823 while (iter.next()) |entry| { 2824 const child = entry.value_ptr.*; 2825 const action_url = formAction(child.focus) orelse continue; 2826 2827 try output.appendSlice(allocator, "<form hidden data-key=\"form:"); 2828 var id_buf: [96]u8 = undefined; 2829 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "{d}\" id=\"" ++ form_id_prefix ++ "{d}\" action=\"", .{ entry.key_ptr.*, entry.key_ptr.* })); 2830 try appendEscapedHtml(allocator, output, action_url); 2831 try output.appendSlice(allocator, "\" method=\"post\"></form>"); 2832 } 2833 } 2834 2835 // the 16 ansi colors as the browser shows them (xterm's defaults) 2836 const ansi_palette = [16]Grid.Color.Rgb{ 2837 .{ .r = 0x00, .g = 0x00, .b = 0x00 }, .{ .r = 0xcd, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xcd, .b = 0x00 }, .{ .r = 0xcd, .g = 0xcd, .b = 0x00 }, 2838 .{ .r = 0x00, .g = 0x00, .b = 0xee }, .{ .r = 0xcd, .g = 0x00, .b = 0xcd }, .{ .r = 0x00, .g = 0xcd, .b = 0xcd }, .{ .r = 0xe5, .g = 0xe5, .b = 0xe5 }, 2839 .{ .r = 0x7f, .g = 0x7f, .b = 0x7f }, .{ .r = 0xff, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xff, .b = 0x00 }, .{ .r = 0xff, .g = 0xff, .b = 0x00 }, 2840 .{ .r = 0x5c, .g = 0x5c, .b = 0xff }, .{ .r = 0xff, .g = 0x00, .b = 0xff }, .{ .r = 0x00, .g = 0xff, .b = 0xff }, .{ .r = 0xff, .g = 0xff, .b = 0xff }, 2841 }; 2842 2843 // resolve any color to rgb: palette colors through the ansi table and the 2844 // xterm 256-color layout (16 ansi, a 6x6x6 cube, then 24 grays) 2845 fn colorRgb(color: Grid.Color) Grid.Color.Rgb { 2846 return switch (color) { 2847 .rgb => |c| c, 2848 .ansi => |a| ansi_palette[@backingInt(a)], 2849 .indexed => |n| if (n < 16) 2850 ansi_palette[n] 2851 else if (n < 232) blk: { 2852 const levels = [6]u8{ 0, 0x5f, 0x87, 0xaf, 0xd7, 0xff }; 2853 const i = n - 16; 2854 break :blk .{ .r = levels[i / 36], .g = levels[(i / 6) % 6], .b = levels[i % 6] }; 2855 } else blk: { 2856 const v: u8 = 8 + (n - 232) * 10; 2857 break :blk .{ .r = v, .g = v, .b = v }; 2858 }, 2859 }; 2860 } 2861 2862 // builds an HTML ` style="color:…;background-color:…"` attribute from a 2863 // cell's style into `buf`, omitting whichever color is unset. an inverted 2864 // cell swaps the two, falling back to the page's --fg/--bg variables for 2865 // whichever side is unset. text attributes follow the colors. returns an 2866 // empty slice when nothing is set. 2867 fn styleAttr(buf: []u8, style: Grid.Style) []const u8 { 2868 if (style.eql(.{})) return buf[0..0]; 2869 const prefix = " style=\""; 2870 @memcpy(buf[0..prefix.len], prefix); 2871 var i: usize = prefix.len; 2872 const inverted = style.inverted; 2873 i = cssColor(buf, i, "color", if (inverted) style.bg else style.fg, if (inverted) "var(--bg)" else null) orelse return buf[0..0]; 2874 i = cssColor(buf, i, "background-color", if (inverted) style.fg else style.bg, if (inverted) "var(--fg)" else null) orelse return buf[0..0]; 2875 const decoration: []const u8 = if (style.underline and style.strikethrough) 2876 "text-decoration:underline line-through;" 2877 else if (style.underline) 2878 "text-decoration:underline;" 2879 else if (style.strikethrough) 2880 "text-decoration:line-through;" 2881 else 2882 ""; 2883 const attributes = std.fmt.bufPrint(buf[i..], "{s}{s}{s}{s}", .{ 2884 if (style.bold) "font-weight:bold;" else "", 2885 if (style.italic) "font-style:italic;" else "", 2886 decoration, 2887 if (style.dim) "opacity:.6;" else "", 2888 }) catch return buf[0..0]; 2889 i += attributes.len; 2890 if (i >= buf.len) return buf[0..0]; 2891 buf[i] = '"'; 2892 return buf[0 .. i + 1]; 2893 } 2894 2895 // append `prop:value;` at buf[i..] for the color, or for the fallback when 2896 // the color is unset (nothing when both are). returns the new end, or null 2897 // when it doesn't fit. 2898 fn cssColor(buf: []u8, i: usize, prop: []const u8, color: ?Grid.Color, fallback: ?[]const u8) ?usize { 2899 const s = if (color) |c| blk: { 2900 const v = colorRgb(c); 2901 break :blk std.fmt.bufPrint(buf[i..], "{s}:#{x:0>2}{x:0>2}{x:0>2};", .{ prop, v.r, v.g, v.b }) catch return null; 2902 } else if (fallback) |f| 2903 std.fmt.bufPrint(buf[i..], "{s}:{s};", .{ prop, f }) catch return null 2904 else 2905 return i; 2906 return i + s.len; 2907 } 2908 2909 // a cell's link as an href, when it's a page path or a web or mail url 2910 fn webLink(link: ?[]const u8) ?[]const u8 { 2911 const url = link orelse return null; 2912 // a page path, not a protocol-relative url 2913 if (url.len > 1 and url[0] == '/' and url[1] != '/') return url; 2914 for ([_][]const u8{ "http://", "https://", "mailto:" }) |scheme| { 2915 if (std.ascii.startsWithIgnoreCase(url, scheme)) return url; 2916 } 2917 return null; 2918 } 2919 2920 fn sameLink(a: ?[]const u8, b: ?[]const u8) bool { 2921 if (a) |x| return if (b) |y| std.mem.eql(u8, x, y) else false; 2922 return b == null; 2923 } 2924 2925 fn appendEscapedHtml(allocator: std.mem.Allocator, out: *std.ArrayList(u8), input: []const u8) !void { 2926 for (input) |ch| { 2927 switch (ch) { 2928 '&' => try out.appendSlice(allocator, "&amp;"), 2929 '<' => try out.appendSlice(allocator, "&lt;"), 2930 '>' => try out.appendSlice(allocator, "&gt;"), 2931 '"' => try out.appendSlice(allocator, "&quot;"), 2932 '\'' => try out.appendSlice(allocator, "&#39;"), 2933 else => try out.append(allocator, ch), 2934 } 2935 } 2936 } 2937 2938 // --- helpers -------------------------------------------------------------- 2939 2940 fn getCookieValue(request: *std.http.Server.Request, name: []const u8) ?[]const u8 { 2941 var iter = request.iterateHeaders(); 2942 while (iter.next()) |header| { 2943 if (!std.ascii.eqlIgnoreCase(header.name, "cookie")) continue; 2944 var pairs = std.mem.splitScalar(u8, header.value, ';'); 2945 while (pairs.next()) |pair| { 2946 const trimmed = std.mem.trim(u8, pair, " \t"); 2947 const eq = std.mem.indexOfScalar(u8, trimmed, '=') orelse continue; 2948 if (std.mem.eql(u8, trimmed[0..eq], name)) { 2949 return trimmed[eq + 1 ..]; 2950 } 2951 } 2952 } 2953 return null; 2954 } 2955 2956 fn parseFormField(allocator: std.mem.Allocator, body: []const u8, key: []const u8) !?[]u8 { 2957 var iter = std.mem.splitScalar(u8, body, '&'); 2958 while (iter.next()) |pair| { 2959 const eq = std.mem.indexOfScalar(u8, pair, '=') orelse continue; 2960 if (std.mem.eql(u8, pair[0..eq], key)) { 2961 return try decodeFormValue(allocator, pair[eq + 1 ..]); 2962 } 2963 } 2964 return null; 2965 } 2966 2967 fn readFormBody(request: *std.http.Server.Request, allocator: std.mem.Allocator) ![]u8 { 2968 var buffer: [256]u8 = undefined; 2969 return request.readerExpectNone(&buffer).allocRemaining(allocator, .limited(65536)); 2970 } 2971 2972 fn decodeFormValue(allocator: std.mem.Allocator, encoded: []const u8) ![]u8 { 2973 var out: std.ArrayList(u8) = .empty; 2974 errdefer out.deinit(allocator); 2975 var i: usize = 0; 2976 while (i < encoded.len) : (i += 1) { 2977 switch (encoded[i]) { 2978 '+' => try out.append(allocator, ' '), 2979 '%' => { 2980 if (i + 2 >= encoded.len) return error.InvalidPercentEncoding; 2981 const hi = std.fmt.charToDigit(encoded[i + 1], 16) catch return error.InvalidPercentEncoding; 2982 const lo = std.fmt.charToDigit(encoded[i + 2], 16) catch return error.InvalidPercentEncoding; 2983 try out.append(allocator, hi * 16 + lo); 2984 i += 2; 2985 }, 2986 else => try out.append(allocator, encoded[i]), 2987 } 2988 } 2989 return try out.toOwnedSlice(allocator); 2990 } 2991 2992 // disk-backed web session store. each login mints a random, opaque token 2993 // (not the user's id) that is stored as a file named by the token hex, whose 2994 // contents are the raw user_id bytes. authenticating a request is a lookup of 2995 // the cookie's token; logout deletes the file, revoking the session. there is 2996 // deliberately no expiry — a session lives until logout. form failures use 2997 // files in the flash subdirectory that the redirected GET consumes. the 2998 // directory is cleared whenever the server starts. 2999 pub const SessionStore = struct { 3000 io: std.Io, 3001 dir: std.Io.Dir, 3002 flash_dir: std.Io.Dir, 3003 auto_login: ?[token_hex_len]u8, 3004 3005 pub const token_hex_len = evt.event_id_size * 2; 3006 3007 pub fn init(io: std.Io, data_dir: std.Io.Dir) !SessionStore { 3008 try data_dir.createDirPath(io, "sessions"); 3009 const dir = try data_dir.openDir(io, "sessions", .{}); 3010 errdefer dir.close(io); 3011 try dir.deleteTree(io, "flash"); 3012 try dir.createDirPath(io, "flash"); 3013 const flash_dir = try dir.openDir(io, "flash", .{}); 3014 errdefer flash_dir.close(io); 3015 const auto_login = blk: { 3016 const file = dir.openFile(io, auto_login_name, .{ .mode = .read_only }) catch break :blk null; 3017 defer file.close(io); 3018 var token: [token_hex_len]u8 = undefined; 3019 var storage: [token_hex_len]u8 = undefined; 3020 var reader = file.reader(io, &storage); 3021 reader.interface.readSliceAll(&token) catch break :blk null; 3022 break :blk token; 3023 }; 3024 return .{ .io = io, .dir = dir, .flash_dir = flash_dir, .auto_login = auto_login }; 3025 } 3026 3027 pub fn deinit(self: SessionStore) void { 3028 self.flash_dir.close(self.io); 3029 self.dir.close(self.io); 3030 } 3031 3032 // mint a new session for user_id, returning the token hex to set as the 3033 // cookie value. 3034 pub fn create(self: SessionStore, user_id: *const [evt.event_id_size]u8) ![token_hex_len]u8 { 3035 var token: [evt.event_id_size]u8 = undefined; 3036 self.io.random(&token); 3037 const token_hex = std.fmt.bytesToHex(token, .lower); 3038 const file = try self.dir.createFile(self.io, &token_hex, .{}); 3039 defer file.close(self.io); 3040 try file.writeStreamingAll(self.io, user_id); 3041 return token_hex; 3042 } 3043 3044 fn createFlash(self: SessionStore, allocator: std.mem.Allocator, value: ui.Session.FormFeedback) ![token_hex_len]u8 { 3045 var token: [evt.event_id_size]u8 = undefined; 3046 self.io.random(&token); 3047 const token_hex = std.fmt.bytesToHex(token, .lower); 3048 const file = try self.flash_dir.createFile(self.io, &token_hex, .{}); 3049 errdefer self.flash_dir.deleteFile(self.io, &token_hex) catch {}; 3050 defer file.close(self.io); 3051 3052 var json: std.Io.Writer.Allocating = .init(allocator); 3053 defer json.deinit(); 3054 try std.json.Stringify.value(value, .{}, &json.writer); 3055 try file.writeStreamingAll(self.io, json.written()); 3056 return token_hex; 3057 } 3058 3059 fn takeFlash(self: SessionStore, allocator: std.mem.Allocator, token_hex: []const u8) ?ui.Session.FormFeedback { 3060 if (!isToken(token_hex)) return null; 3061 const file = self.flash_dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return null; 3062 defer self.flash_dir.deleteFile(self.io, token_hex) catch {}; 3063 defer file.close(self.io); 3064 3065 var storage: [4096]u8 = undefined; 3066 var reader = file.reader(self.io, &storage); 3067 const bytes = reader.interface.allocRemaining(allocator, .limited(512 * 1024)) catch return null; 3068 return std.json.parseFromSliceLeaky(ui.Session.FormFeedback, allocator, bytes, .{}) catch null; 3069 } 3070 3071 // resolve a cookie's token to its user_id. returns false (logged out) for a 3072 // missing, malformed, or unknown token. 3073 pub fn lookup(self: SessionStore, token_hex: []const u8, out: *[evt.event_id_size]u8) bool { 3074 if (!isToken(token_hex)) return false; 3075 const file = self.dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return false; 3076 defer file.close(self.io); 3077 var storage: [evt.event_id_size]u8 = undefined; 3078 var file_reader = file.reader(self.io, &storage); 3079 file_reader.interface.readSliceAll(out) catch return false; 3080 return true; 3081 } 3082 3083 // revoke a session. a no-op for a missing or malformed token. 3084 pub fn remove(self: SessionStore, token_hex: []const u8) void { 3085 if (!isToken(token_hex)) return; 3086 self.dir.deleteFile(self.io, token_hex) catch {}; 3087 } 3088 3089 // leave `token_hex`'s session for visitors arriving without one. only the 3090 // `try` fixture writes one. the name can't collide with a session token. 3091 pub fn offerAutoLogin(self: SessionStore, token_hex: *const [token_hex_len]u8) !void { 3092 const file = try self.dir.createFile(self.io, auto_login_name, .{}); 3093 defer file.close(self.io); 3094 try file.writeStreamingAll(self.io, token_hex); 3095 } 3096 3097 pub fn autoLogin(self: SessionStore, out: *[token_hex_len]u8) bool { 3098 out.* = self.auto_login orelse return false; 3099 return true; 3100 } 3101 3102 const auto_login_name = "auto-login"; 3103 3104 // a token is exactly token_hex_len hex chars. validating before using the 3105 // value as a path keeps attacker-supplied cookies from escaping the 3106 // sessions dir (e.g. via "/" or ".." bytes). 3107 fn isToken(token_hex: []const u8) bool { 3108 if (token_hex.len != token_hex_len) return false; 3109 for (token_hex) |c| if (!std.ascii.isHex(c)) return false; 3110 return true; 3111 } 3112 }; 3113