╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ web.zig ──────────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯
🬐 🬠 🬞🬂🬏 🬟 🬑 🬟 🬑 ╭f1323b6e..╮ f1323b6e.. haxy: 🬋🬋🬋 🬋🬋🬋 🬋 🬋 │files │ commits refs discuss issues patches new login 🬐 🬠 🬐 🬠 🬑 🬟 🬰 ╰──────────╯ (686) 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 │ ╰─────────────────────────────────╯
2258 '<' => try json_escaped.appendSlice(allocator, "\\u003c"), 2259 '>' => try json_escaped.appendSlice(allocator, "\\u003e"), 2260 else => try json_escaped.append(allocator, c), 2261 }; 2262 2263 var out: std.ArrayList(u8) = .empty; 2264 errdefer out.deinit(allocator); 2265 { 2266 var cursor: usize = 0; 2267 for (&[_]struct { needle: []const u8, replacement: []const u8 }{ 2268 .{ .needle = "{{{ HAXY_HTML }}}", .replacement = content }, 2269 .{ .needle = "{{{ HAXY_JSON }}}", .replacement = json_escaped.items }, 2270 }) |sub| { 2271 const idx = std.mem.indexOfPos(u8, template, cursor, sub.needle) orelse return error.MissingTemplateToken; 2272 try out.appendSlice(allocator, template[cursor..idx]); 2273 try out.appendSlice(allocator, sub.replacement); 2274 cursor = idx + sub.needle.len; 2275 } 2276 try out.appendSlice(allocator, template[cursor..]); 2277 } 2278 return try out.toOwnedSlice(allocator); 2279 } 2280 2281 fn findEmbed(request_path: []const u8) ?Embed { 2282 // embeds are matched before pages, so a dot keeps them from claiming a username or tab 2283 comptime for (embeds) |embed| { 2284 if (std.mem.indexOfScalar(u8, embed.path, '.') == null) @compileError("embed path needs a '.' so it can't shadow a page: " ++ embed.path); 2285 }; 2286 if (request_path.len < 2 or request_path[0] != '/') return null; 2287 const path = request_path[1..]; 2288 2289 for (embeds) |embed| { 2290 if (std.mem.eql(u8, path, embed.path)) return embed; 2291 } 2292 return null; 2293 } 2294 2295 // emits the TUI grid cells as static HTML. each web-native Scroll becomes its 2296 // own absolutely-positioned, natively-scrollable <div> holding its full content, 2297 // rendered recursively so nested scrolls work. 2298 pub fn generateHtml(allocator: std.mem.Allocator, root: *ui.Widget, session: *ui.Session) ![]const u8 { 2299 const grid = root.getGrid() orelse return error.MissingGrid; 2300 const root_focus = root.getFocus(); 2301 2302 var out: std.ArrayList(u8) = .empty; 2303 errdefer out.deinit(allocator); 2304 2305 switch (root.*) { 2306 .background => |*background| { 2307 if (background.art.getGrid()) |art| { 2308 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 }); 2309 try renderPanel(allocator, &out, background.art.getFocus(), art, session, root_focus); 2310 try out.appendSlice(allocator, "</div>"); 2311 } 2312 }, 2313 else => {}, 2314 } 2315 try out.appendSlice(allocator, "<div class=\"grid-content\" data-key=\"panel:root\">"); 2316 try renderPanel(allocator, &out, root_focus, grid, session, root_focus); 2317 try out.appendSlice(allocator, "</div>"); 2318 try renderForms(allocator, &out, root_focus); 2319 return try out.toOwnedSlice(allocator); 2320 } 2321 2322 // render one panel — a focus subtree and its content grid — as HTML, recursing 2323 // once per web-native Scroll inside it. the root panel is the whole page; each 2324 // Scroll becomes a nested, natively-scrollable div holding its full content. 2325 // emits the panel's grid cells as text, leaving holes where child scrolls sit, 2326 // then the child scroll divs over those holes. 2327 fn renderPanel(allocator: std.mem.Allocator, output: *std.ArrayList(u8), focus: *Focus, grid: Grid, session: *ui.Session, root_focus: *Focus) !void { 2328 // `direct` is this panel's scroll children, each drawn as an overlaid div. 2329 // `excluded` is every focus id that belongs to a scroll (the scroll nodes 2330 // plus their descendants, which the focus tree flattens into this panel's 2331 // children): the cell hit-test below skips them so this panel doesn't claim 2332 // cells that are really rendered inside a child scroll's own panel. 2333 // (scrolls aren't nested in practice, so every scroll child is direct here.) 2334 var direct: std.ArrayList(usize) = .empty; 2335 defer direct.deinit(allocator); 2336 var excluded: std.AutoHashMapUnmanaged(usize, void) = .empty; 2337 defer excluded.deinit(allocator); 2338 { 2339 var it = focus.children.iterator(); 2340 while (it.next()) |e| { 2341 if (e.value_ptr.focus.scroll == null) continue; 2342 try direct.append(allocator, e.key_ptr.*); 2343 try excluded.put(allocator, e.key_ptr.*, {}); 2344 var mit = e.value_ptr.focus.children.iterator(); 2345 while (mit.next()) |m| try excluded.put(allocator, m.key_ptr.*, {}); 2346 } 2347 } 2348 2349 // the HTML element a run of cells is wrapped in, chosen from the cell's 2350 // focusable kind 2351 const CellTag = union(enum) { 2352 span, // clickable focusable cell 2353 a: []const u8, // clickable focusable link 2354 plain, // non-focusable, colored 2355 2356 const a_prefix = "a:"; 2357 // an "in-page" anchor: rendered as a real <a href> so it works with js 2358 // disabled, but wasm handles it without navigating. 2359 fn init(str: []const u8) @This() { 2360 if (std.mem.startsWith(u8, str, ui.raw_link_prefix)) { 2361 return .{ .a = str[ui.raw_link_prefix.len..] }; 2362 } 2363 if (std.mem.startsWith(u8, str, ui.in_page_link_prefix)) { 2364 return .{ .a = str[ui.in_page_link_prefix.len..] }; 2365 } 2366 if (std.mem.startsWith(u8, str, a_prefix)) { 2367 return .{ .a = str[a_prefix.len..] }; 2368 } 2369 return .span; 2370 } 2371 2372 fn writeOpenTag(self: @This(), alloc: std.mem.Allocator, out: *std.ArrayList(u8), id: usize, style_attr: []const u8) !void { 2373 var id_buf: [32]u8 = undefined; 2374 switch (self) { 2375 .span => { 2376 try out.appendSlice(alloc, "<span class=\"clickable\" data-focus-id=\""); 2377 try out.appendSlice(alloc, try std.fmt.bufPrint(&id_buf, "{d}", .{id})); 2378 try out.appendSlice(alloc, "\""); 2379 try out.appendSlice(alloc, style_attr); 2380 try out.appendSlice(alloc, ">"); 2381 }, 2382 .a => |href| { 2383 // tabindex=-1 keeps these out of the browser's tab order 2384 try out.appendSlice(alloc, "<a class=\"clickable\" tabindex=\"-1\" data-focus-id=\""); 2385 try out.appendSlice(alloc, try std.fmt.bufPrint(&id_buf, "{d}", .{id})); 2386 try out.appendSlice(alloc, "\" href=\""); 2387 try appendEscapedHtml(alloc, out, href); 2388 try out.appendSlice(alloc, "\""); 2389 try out.appendSlice(alloc, style_attr); 2390 try out.appendSlice(alloc, ">"); 2391 }, 2392 .plain => { 2393 try out.appendSlice(alloc, "<span"); 2394 try out.appendSlice(alloc, style_attr); 2395 try out.appendSlice(alloc, ">"); 2396 }, 2397 } 2398 } 2399 2400 fn closeTag(self: @This()) []const u8 { 2401 return switch (self) { 2402 .span, .plain => "</span>", 2403 .a => "</a>", 2404 }; 2405 } 2406 }; 2407 2408 // the focusable owning each cell, among this panel's own (skipping any 2409 // that belong to a child scroll, whose cells are drawn in their own panel). 2410 // claimed in focus order, so the first focusable over a cell keeps it. 2411 // looking every focusable up for every cell is quadratic in a long list. 2412 const owners = try allocator.alloc(?usize, grid.size.width * grid.size.height); 2413 defer allocator.free(owners); 2414 @memset(owners, null); 2415 { 2416 var it = focus.children.iterator(); 2417 while (it.next()) |entry| { 2418 const child = entry.value_ptr.*; 2419 if (child.focus.mode != .all) continue; 2420 if (excluded.contains(entry.key_ptr.*)) continue; 2421 const r = child.rect; 2422 for (@min(r.y, grid.size.height)..@min(r.y + r.size.height, grid.size.height)) |y| { 2423 for (@min(r.x, grid.size.width)..@min(r.x + r.size.width, grid.size.width)) |x| { 2424 const owner = &owners[y * grid.size.width + x]; 2425 if (owner.* == null) owner.* = entry.key_ptr.*; 2426 } 2427 } 2428 } 2429 } 2430 2431 // the cells are the volatile part of a panel. js replaces this one subtree 2432 // wholesale while retaining the panel's native controls and scroll shells. 2433 try output.appendSlice(allocator, "<div class=\"grid-cells\">"); 2434 2435 // emit this panel's grid as rows of text, coalescing adjacent cells that 2436 // share a focus id and style into one tag (a clickable span, a link, or a 2437 // plain styled span). cells under a child scroll keep only their background. 2438 // a cell's own link is an anchor nested in that tag. 2439 for (0..grid.size.height) |y| { 2440 var cur_id: ?usize = null; 2441 var cur_style: Grid.Style = .{}; 2442 var open_tag: ?CellTag = null; 2443 var open_link: ?[]const u8 = null; 2444 var first = true; 2445 for (0..grid.size.width) |x| { 2446 const cell = (try grid.cell(x, y)).*; 2447 // a cell covered by a child scroll's viewport is drawn by that scroll's 2448 // own div, so blank its glyph and make it non-clickable here — but keep 2449 // its background, so the backdrop still shows through the scroll's 2450 // transparent div instead of a bare hole. 2451 const covered_by_scroll = blk: { 2452 for (direct.items) |id| { 2453 const r = (focus.children.get(id) orelse continue).rect; 2454 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; 2455 } 2456 break :blk false; 2457 }; 2458 // the focusable owning the cell at (x, y); none for a covered cell. 2459 const cell_id = if (covered_by_scroll) null else owners[y * grid.size.width + x]; 2460 const style: Grid.Style = if (covered_by_scroll) .{ .bg = cell.style.bg } else cell.style; 2461 2462 if (first or cell_id != cur_id or !style.eql(cur_style)) { 2463 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2464 open_link = null; 2465 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 2466 2467 var new_tag: ?CellTag = null; 2468 if (cell_id) |id| { 2469 if (focus.children.get(id)) |child| { 2470 new_tag = switch (child.focus.kind) { 2471 .custom => |custom| CellTag.init(custom), 2472 else => .span, 2473 }; 2474 } 2475 } 2476 if (new_tag == null and !style.eql(.{})) new_tag = .plain; 2477 2478 if (new_tag) |t| { 2479 var style_buf: [192]u8 = undefined; 2480 try t.writeOpenTag(allocator, output, cell_id orelse 0, styleAttr(&style_buf, style)); 2481 } 2482 2483 open_tag = new_tag; 2484 cur_id = cell_id; 2485 cur_style = style; 2486 first = false; 2487 } 2488 2489 // an anchor can't nest in another, so a link tag's cells skip theirs 2490 const in_anchor = if (open_tag) |t| t == .a else false; 2491 const link = if (covered_by_scroll or in_anchor) null else webLink(cell.link); 2492 if (!sameLink(link, open_link)) { 2493 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2494 if (link) |url| { 2495 // a page path opens in this tab, any other url in a new one 2496 try output.appendSlice(allocator, if (url[0] == '/') 2497 "<a class=\"cell-link\" tabindex=\"-1\" href=\"" 2498 else 2499 "<a class=\"cell-link\" tabindex=\"-1\" target=\"_blank\" rel=\"noopener noreferrer\" href=\""); 2500 try appendEscapedHtml(allocator, output, url); 2501 try output.appendSlice(allocator, "\">"); 2502 } 2503 open_link = link; 2504 } 2505 2506 if (covered_by_scroll) { 2507 try appendEscapedHtml(allocator, output, " "); 2508 } else if (cell.continuation) { 2509 // the wide rune to the left was emitted 2ch wide, covering this column 2510 } else if (cell.rune) |rune| { 2511 var encoded: [4]u8 = undefined; 2512 const encoded_len = try std.unicode.utf8Encode(rune, &encoded); 2513 const rune_text = encoded[0..encoded_len]; 2514 // a double-width rune is pinned inside a 2ch span so the 2515 // fallback glyph's advance width can't shift the rest of the row 2516 const wide = x + 1 < grid.size.width and (try grid.cell(x + 1, y)).continuation; 2517 if (wide) { 2518 try output.appendSlice(allocator, "<span class=\"w2\">"); 2519 try appendEscapedHtml(allocator, output, rune_text); 2520 try output.appendSlice(allocator, "</span>"); 2521 } else { 2522 try appendEscapedHtml(allocator, output, rune_text); 2523 } 2524 } else { 2525 try appendEscapedHtml(allocator, output, " "); 2526 } 2527 } 2528 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2529 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 2530 try output.append(allocator, '\n'); 2531 } 2532 try output.appendSlice(allocator, "</div>"); 2533 2534 // native controls live in their panel, beside the replaceable cells. their 2535 // stable keys let JS update layout without recreating their DOM nodes, and 2536 // being actual descendants of a scroll gives them native movement/clipping. 2537 try renderPanelControls(allocator, output, focus, session, root_focus, &excluded); 2538 2539 // each child scroll becomes a natively-scrollable div positioned over its 2540 // viewport, holding its full content rendered recursively. 2541 for (direct.items) |id| { 2542 const child = focus.children.get(id) orelse continue; 2543 const info = child.focus.scroll orelse continue; 2544 const r = child.rect; 2545 // overflow only on the axes the widget scrolls; `auto` shows a bar only 2546 // when that axis actually overflows. the other axis is clipped (hidden), 2547 // matching how the terminal Scroll handles its non-scrolling axis. 2548 const overflow = switch (info.direction) { 2549 .vert => "overflow-x:hidden;overflow-y:auto", 2550 .horiz => "overflow-x:auto;overflow-y:hidden", 2551 .both => "overflow:auto", 2552 }; 2553 // the id carries a content version so JS preserves the native scroll 2554 // position across re-renders of the same content but resets it when the 2555 // content is replaced — e.g. selecting a different commit. the widget's 2556 // scroll offset (in cells) rides along so JS can apply it when it has no 2557 // preserved position, letting a wasm-side scrollToRect (the files list 2558 // scrolling to its selected row on page load) reach the browser. 2559 var buf: [256]u8 = undefined; 2560 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 })); 2561 try renderPanel(allocator, output, child.focus, info.content, session, root_focus); 2562 try output.appendSlice(allocator, "</div>"); 2563 } 2564 } 2565 2566 const form_prefix = "form:"; 2567 const form_id_prefix = "haxy-form-"; 2568 2569 fn formAction(focus: *const Focus) ?[]const u8 { 2570 return switch (focus.kind) { 2571 .custom => |custom| if (std.mem.startsWith(u8, custom, form_prefix)) custom[form_prefix.len..] else null, 2572 else => null, 2573 }; 2574 } 2575 2576 // find the form ancestor of a flattened focus-tree child. html's `form` 2577 // attribute then associates the control with that form without requiring the 2578 // form and control to share a DOM parent. 2579 fn formOwner(root_focus: *Focus, focus_id: usize) ?usize { 2580 var id = focus_id; 2581 while (root_focus.children.get(id)) |child| { 2582 const parent_id = child.parent_id; 2583 if (parent_id == root_focus.id) return if (formAction(root_focus) != null) root_focus.id else null; 2584 const parent = root_focus.children.get(parent_id) orelse return null; 2585 if (formAction(parent.focus) != null) return parent_id; 2586 id = parent_id; 2587 } 2588 return null; 2589 } 2590 2591 fn appendFormAttribute(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus, focus_id: usize) !void { 2592 const form_id = formOwner(root_focus, focus_id) orelse return; 2593 var buf: [64]u8 = undefined; 2594 try output.appendSlice(allocator, try std.fmt.bufPrint(&buf, " form=\"" ++ form_id_prefix ++ "{d}\"", .{form_id})); 2595 } 2596 2597 fn renderPanelControls( 2598 allocator: std.mem.Allocator, 2599 output: *std.ArrayList(u8), 2600 focus: *Focus, 2601 session: *ui.Session, 2602 root_focus: *Focus, 2603 excluded: *const std.AutoHashMapUnmanaged(usize, void), 2604 ) !void { 2605 var iter = focus.children.iterator(); 2606 while (iter.next()) |entry| { 2607 const id = entry.key_ptr.*; 2608 if (excluded.contains(id)) continue; 2609 const child = entry.value_ptr.*; 2610 const r = child.rect; 2611 2612 if (r.size.width == 0 or r.size.height == 0) continue; // not laid out, rather than merely off-screen 2613 2614 switch (child.focus.kind) { 2615 .text_input, .text_input_password, .text_area => { 2616 const ti = session.text_inputs.get(id) orelse continue; 2617 2618 const inner_left = r.x + 1; 2619 const inner_top = r.y + 1; 2620 const inner_width = if (r.size.width > 2) r.size.width - 2 else 0; 2621 const preserve = !ti.options.read_only; 2622 2623 if (child.focus.kind == .text_area) { 2624 const value = try ti.text(allocator); 2625 defer allocator.free(value); 2626 var id_buf: [128]u8 = undefined; 2627 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<textarea data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2628 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2629 try appendFormAttribute(allocator, output, root_focus, id); 2630 if (ti.options.name.len > 0) { 2631 try output.appendSlice(allocator, " name=\""); 2632 try appendEscapedHtml(allocator, output, ti.options.name); 2633 try output.append(allocator, '"'); 2634 } 2635 const inner_height = if (r.size.height > 2) r.size.height - 2 else 0; 2636 var pos_buf: [128]u8 = undefined; 2637 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 })); 2638 try appendEscapedHtml(allocator, output, value); 2639 try output.appendSlice(allocator, "</textarea>"); 2640 continue; 2641 } 2642 2643 var id_buf: [160]u8 = undefined; 2644 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 })); 2645 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2646 try appendFormAttribute(allocator, output, root_focus, id); 2647 if (ti.options.name.len > 0) { 2648 try output.appendSlice(allocator, " name=\""); 2649 try appendEscapedHtml(allocator, output, ti.options.name); 2650 try output.append(allocator, '"'); 2651 } 2652 if (child.focus.kind != .text_input_password) { 2653 const value = try ti.text(allocator); 2654 defer allocator.free(value); 2655 try output.appendSlice(allocator, " value=\""); 2656 try appendEscapedHtml(allocator, output, value); 2657 try output.append(allocator, '"'); 2658 } 2659 var pos_buf: [96]u8 = undefined; 2660 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 })); 2661 }, 2662 .custom => |custom| { 2663 if (std.mem.eql(u8, custom, "submit") or std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2664 if (formOwner(root_focus, id) == null) continue; 2665 var id_buf: [128]u8 = undefined; 2666 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<button type=\"submit\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2667 try appendFormAttribute(allocator, output, root_focus, id); 2668 if (std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2669 try output.appendSlice(allocator, " formaction=\""); 2670 try appendEscapedHtml(allocator, output, custom[ui.submit_action_prefix.len..]); 2671 try output.append(allocator, '"'); 2672 } 2673 var pos_buf: [128]u8 = undefined; 2674 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 })); 2675 } else if (std.mem.startsWith(u8, custom, ui.radio_prefix)) { 2676 // an invisible native radio over the option, checked when the option is its row's selection 2677 const field = custom[ui.radio_prefix.len..]; 2678 const separator = std.mem.indexOfScalar(u8, field, '=') orelse continue; 2679 const row = root_focus.children.get(child.parent_id) orelse continue; 2680 var id_buf: [128]u8 = undefined; 2681 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<input type=\"radio\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2682 try appendFormAttribute(allocator, output, root_focus, id); 2683 try output.appendSlice(allocator, " name=\""); 2684 try appendEscapedHtml(allocator, output, field[0..separator]); 2685 try output.appendSlice(allocator, "\" value=\""); 2686 try appendEscapedHtml(allocator, output, field[separator + 1 ..]); 2687 try output.append(allocator, '"'); 2688 if (row.focus.child_id == id) try output.appendSlice(allocator, " checked"); 2689 var pos_buf: [128]u8 = undefined; 2690 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 })); 2691 } else if (std.mem.startsWith(u8, custom, ui.file_input_prefix)) { 2692 try output.appendSlice(allocator, "<input type=\"file\" data-preserve-value data-action=\""); 2693 try appendEscapedHtml(allocator, output, custom[ui.file_input_prefix.len..]); 2694 var id_buf: [128]u8 = undefined; 2695 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 })); 2696 } 2697 }, 2698 else => {}, 2699 } 2700 } 2701 } 2702 2703 // emit hidden form owners beside the rendered panels. their controls point 2704 // back here with the standard HTML `form` attribute. 2705 fn renderForms(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus) !void { 2706 // the focus child map preserves insertion order, which matches the order 2707 // widgets were added in code 2708 var iter = root_focus.children.iterator(); 2709 while (iter.next()) |entry| { 2710 const child = entry.value_ptr.*; 2711 const action_url = formAction(child.focus) orelse continue; 2712 2713 try output.appendSlice(allocator, "<form hidden data-key=\"form:"); 2714 var id_buf: [96]u8 = undefined; 2715 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "{d}\" id=\"" ++ form_id_prefix ++ "{d}\" action=\"", .{ entry.key_ptr.*, entry.key_ptr.* })); 2716 try appendEscapedHtml(allocator, output, action_url); 2717 try output.appendSlice(allocator, "\" method=\"post\"></form>"); 2718 } 2719 } 2720 2721 // the 16 ansi colors as the browser shows them (xterm's defaults) 2722 const ansi_palette = [16]Grid.Color.Rgb{ 2723 .{ .r = 0x00, .g = 0x00, .b = 0x00 }, .{ .r = 0xcd, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xcd, .b = 0x00 }, .{ .r = 0xcd, .g = 0xcd, .b = 0x00 }, 2724 .{ .r = 0x00, .g = 0x00, .b = 0xee }, .{ .r = 0xcd, .g = 0x00, .b = 0xcd }, .{ .r = 0x00, .g = 0xcd, .b = 0xcd }, .{ .r = 0xe5, .g = 0xe5, .b = 0xe5 }, 2725 .{ .r = 0x7f, .g = 0x7f, .b = 0x7f }, .{ .r = 0xff, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xff, .b = 0x00 }, .{ .r = 0xff, .g = 0xff, .b = 0x00 }, 2726 .{ .r = 0x5c, .g = 0x5c, .b = 0xff }, .{ .r = 0xff, .g = 0x00, .b = 0xff }, .{ .r = 0x00, .g = 0xff, .b = 0xff }, .{ .r = 0xff, .g = 0xff, .b = 0xff }, 2727 }; 2728 2729 // resolve any color to rgb: palette colors through the ansi table and the 2730 // xterm 256-color layout (16 ansi, a 6x6x6 cube, then 24 grays) 2731 fn colorRgb(color: Grid.Color) Grid.Color.Rgb { 2732 return switch (color) { 2733 .rgb => |c| c, 2734 .ansi => |a| ansi_palette[@backingInt(a)], 2735 .indexed => |n| if (n < 16) 2736 ansi_palette[n] 2737 else if (n < 232) blk: { 2738 const levels = [6]u8{ 0, 0x5f, 0x87, 0xaf, 0xd7, 0xff }; 2739 const i = n - 16; 2740 break :blk .{ .r = levels[i / 36], .g = levels[(i / 6) % 6], .b = levels[i % 6] }; 2741 } else blk: { 2742 const v: u8 = 8 + (n - 232) * 10; 2743 break :blk .{ .r = v, .g = v, .b = v }; 2744 }, 2745 }; 2746 } 2747 2748 // builds an HTML ` style="color:…;background-color:…"` attribute from a 2749 // cell's style into `buf`, omitting whichever color is unset. an inverted 2750 // cell swaps the two, falling back to the page's --fg/--bg variables for 2751 // whichever side is unset. text attributes follow the colors. returns an 2752 // empty slice when nothing is set. 2753 fn styleAttr(buf: []u8, style: Grid.Style) []const u8 { 2754 if (style.eql(.{})) return buf[0..0]; 2755 const prefix = " style=\""; 2756 @memcpy(buf[0..prefix.len], prefix); 2757 var i: usize = prefix.len; 2758 const inverted = style.inverted; 2759 i = cssColor(buf, i, "color", if (inverted) style.bg else style.fg, if (inverted) "var(--bg)" else null) orelse return buf[0..0]; 2760 i = cssColor(buf, i, "background-color", if (inverted) style.fg else style.bg, if (inverted) "var(--fg)" else null) orelse return buf[0..0]; 2761 const decoration: []const u8 = if (style.underline and style.strikethrough) 2762 "text-decoration:underline line-through;" 2763 else if (style.underline) 2764 "text-decoration:underline;" 2765 else if (style.strikethrough) 2766 "text-decoration:line-through;" 2767 else 2768 ""; 2769 const attributes = std.fmt.bufPrint(buf[i..], "{s}{s}{s}{s}", .{ 2770 if (style.bold) "font-weight:bold;" else "", 2771 if (style.italic) "font-style:italic;" else "", 2772 decoration, 2773 if (style.dim) "opacity:.6;" else "", 2774 }) catch return buf[0..0]; 2775 i += attributes.len; 2776 if (i >= buf.len) return buf[0..0]; 2777 buf[i] = '"'; 2778 return buf[0 .. i + 1]; 2779 } 2780 2781 // append `prop:value;` at buf[i..] for the color, or for the fallback when 2782 // the color is unset (nothing when both are). returns the new end, or null 2783 // when it doesn't fit. 2784 fn cssColor(buf: []u8, i: usize, prop: []const u8, color: ?Grid.Color, fallback: ?[]const u8) ?usize { 2785 const s = if (color) |c| blk: { 2786 const v = colorRgb(c); 2787 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; 2788 } else if (fallback) |f| 2789 std.fmt.bufPrint(buf[i..], "{s}:{s};", .{ prop, f }) catch return null 2790 else 2791 return i; 2792 return i + s.len; 2793 } 2794 2795 // a cell's link as an href, when it's a page path or a web or mail url 2796 fn webLink(link: ?[]const u8) ?[]const u8 { 2797 const url = link orelse return null; 2798 // a page path, not a protocol-relative url 2799 if (url.len > 1 and url[0] == '/' and url[1] != '/') return url; 2800 for ([_][]const u8{ "http://", "https://", "mailto:" }) |scheme| { 2801 if (std.ascii.startsWithIgnoreCase(url, scheme)) return url; 2802 } 2803 return null; 2804 } 2805 2806 fn sameLink(a: ?[]const u8, b: ?[]const u8) bool { 2807 if (a) |x| return if (b) |y| std.mem.eql(u8, x, y) else false; 2808 return b == null; 2809 } 2810 2811 fn appendEscapedHtml(allocator: std.mem.Allocator, out: *std.ArrayList(u8), input: []const u8) !void { 2812 for (input) |ch| { 2813 switch (ch) { 2814 '&' => try out.appendSlice(allocator, "&amp;"), 2815 '<' => try out.appendSlice(allocator, "&lt;"), 2816 '>' => try out.appendSlice(allocator, "&gt;"), 2817 '"' => try out.appendSlice(allocator, "&quot;"), 2818 '\'' => try out.appendSlice(allocator, "&#39;"), 2819 else => try out.append(allocator, ch), 2820 } 2821 } 2822 } 2823 2824 // --- helpers -------------------------------------------------------------- 2825 2826 fn getCookieValue(request: *std.http.Server.Request, name: []const u8) ?[]const u8 { 2827 var iter = request.iterateHeaders(); 2828 while (iter.next()) |header| { 2829 if (!std.ascii.eqlIgnoreCase(header.name, "cookie")) continue; 2830 var pairs = std.mem.splitScalar(u8, header.value, ';'); 2831 while (pairs.next()) |pair| { 2832 const trimmed = std.mem.trim(u8, pair, " \t"); 2833 const eq = std.mem.indexOfScalar(u8, trimmed, '=') orelse continue; 2834 if (std.mem.eql(u8, trimmed[0..eq], name)) { 2835 return trimmed[eq + 1 ..]; 2836 } 2837 } 2838 } 2839 return null; 2840 } 2841 2842 fn parseFormField(allocator: std.mem.Allocator, body: []const u8, key: []const u8) !?[]u8 { 2843 var iter = std.mem.splitScalar(u8, body, '&'); 2844 while (iter.next()) |pair| { 2845 const eq = std.mem.indexOfScalar(u8, pair, '=') orelse continue; 2846 if (std.mem.eql(u8, pair[0..eq], key)) { 2847 return try decodeFormValue(allocator, pair[eq + 1 ..]); 2848 } 2849 } 2850 return null; 2851 } 2852 2853 fn readFormBody(request: *std.http.Server.Request, allocator: std.mem.Allocator) ![]u8 { 2854 var buffer: [256]u8 = undefined; 2855 return request.readerExpectNone(&buffer).allocRemaining(allocator, .limited(65536)); 2856 } 2857 2858 fn decodeFormValue(allocator: std.mem.Allocator, encoded: []const u8) ![]u8 { 2859 var out: std.ArrayList(u8) = .empty; 2860 errdefer out.deinit(allocator); 2861 var i: usize = 0; 2862 while (i < encoded.len) : (i += 1) { 2863 switch (encoded[i]) { 2864 '+' => try out.append(allocator, ' '), 2865 '%' => { 2866 if (i + 2 >= encoded.len) return error.InvalidPercentEncoding; 2867 const hi = std.fmt.charToDigit(encoded[i + 1], 16) catch return error.InvalidPercentEncoding; 2868 const lo = std.fmt.charToDigit(encoded[i + 2], 16) catch return error.InvalidPercentEncoding; 2869 try out.append(allocator, hi * 16 + lo); 2870 i += 2; 2871 }, 2872 else => try out.append(allocator, encoded[i]), 2873 } 2874 } 2875 return try out.toOwnedSlice(allocator); 2876 } 2877 2878 // disk-backed web session store. each login mints a random, opaque token 2879 // (not the user's id) that is stored as a file named by the token hex, whose 2880 // contents are the raw user_id bytes. authenticating a request is a lookup of 2881 // the cookie's token; logout deletes the file, revoking the session. there is 2882 // deliberately no expiry — a session lives until logout. form failures use 2883 // files in the flash subdirectory that the redirected GET consumes. the 2884 // directory is cleared whenever the server starts. 2885 pub const SessionStore = struct { 2886 io: std.Io, 2887 dir: std.Io.Dir, 2888 flash_dir: std.Io.Dir, 2889 auto_login: ?[token_hex_len]u8, 2890 2891 pub const token_hex_len = evt.event_id_size * 2; 2892 2893 pub fn init(io: std.Io, data_dir: std.Io.Dir) !SessionStore { 2894 try data_dir.createDirPath(io, "sessions"); 2895 const dir = try data_dir.openDir(io, "sessions", .{}); 2896 errdefer dir.close(io); 2897 try dir.deleteTree(io, "flash"); 2898 try dir.createDirPath(io, "flash"); 2899 const flash_dir = try dir.openDir(io, "flash", .{}); 2900 errdefer flash_dir.close(io); 2901 const auto_login = blk: { 2902 const file = dir.openFile(io, auto_login_name, .{ .mode = .read_only }) catch break :blk null; 2903 defer file.close(io); 2904 var token: [token_hex_len]u8 = undefined; 2905 var storage: [token_hex_len]u8 = undefined; 2906 var reader = file.reader(io, &storage); 2907 reader.interface.readSliceAll(&token) catch break :blk null; 2908 break :blk token; 2909 }; 2910 return .{ .io = io, .dir = dir, .flash_dir = flash_dir, .auto_login = auto_login }; 2911 } 2912 2913 pub fn deinit(self: SessionStore) void { 2914 self.flash_dir.close(self.io); 2915 self.dir.close(self.io); 2916 } 2917 2918 // mint a new session for user_id, returning the token hex to set as the 2919 // cookie value. 2920 pub fn create(self: SessionStore, user_id: *const [evt.event_id_size]u8) ![token_hex_len]u8 { 2921 var token: [evt.event_id_size]u8 = undefined; 2922 self.io.random(&token); 2923 const token_hex = std.fmt.bytesToHex(token, .lower); 2924 const file = try self.dir.createFile(self.io, &token_hex, .{}); 2925 defer file.close(self.io); 2926 try file.writeStreamingAll(self.io, user_id); 2927 return token_hex; 2928 } 2929 2930 fn createFlash(self: SessionStore, allocator: std.mem.Allocator, value: ui.Session.FormFeedback) ![token_hex_len]u8 { 2931 var token: [evt.event_id_size]u8 = undefined; 2932 self.io.random(&token); 2933 const token_hex = std.fmt.bytesToHex(token, .lower); 2934 const file = try self.flash_dir.createFile(self.io, &token_hex, .{}); 2935 errdefer self.flash_dir.deleteFile(self.io, &token_hex) catch {}; 2936 defer file.close(self.io); 2937 2938 var json: std.Io.Writer.Allocating = .init(allocator); 2939 defer json.deinit(); 2940 try std.json.Stringify.value(value, .{}, &json.writer); 2941 try file.writeStreamingAll(self.io, json.written()); 2942 return token_hex; 2943 } 2944 2945 fn takeFlash(self: SessionStore, allocator: std.mem.Allocator, token_hex: []const u8) ?ui.Session.FormFeedback { 2946 if (!isToken(token_hex)) return null; 2947 const file = self.flash_dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return null; 2948 defer self.flash_dir.deleteFile(self.io, token_hex) catch {}; 2949 defer file.close(self.io); 2950 2951 var storage: [4096]u8 = undefined; 2952 var reader = file.reader(self.io, &storage); 2953 const bytes = reader.interface.allocRemaining(allocator, .limited(512 * 1024)) catch return null; 2954 return std.json.parseFromSliceLeaky(ui.Session.FormFeedback, allocator, bytes, .{}) catch null; 2955 } 2956 2957 // resolve a cookie's token to its user_id. returns false (logged out) for a 2958 // missing, malformed, or unknown token. 2959 pub fn lookup(self: SessionStore, token_hex: []const u8, out: *[evt.event_id_size]u8) bool { 2960 if (!isToken(token_hex)) return false; 2961 const file = self.dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return false; 2962 defer file.close(self.io); 2963 var storage: [evt.event_id_size]u8 = undefined; 2964 var file_reader = file.reader(self.io, &storage); 2965 file_reader.interface.readSliceAll(out) catch return false; 2966 return true; 2967 } 2968 2969 // revoke a session. a no-op for a missing or malformed token. 2970 pub fn remove(self: SessionStore, token_hex: []const u8) void { 2971 if (!isToken(token_hex)) return; 2972 self.dir.deleteFile(self.io, token_hex) catch {}; 2973 } 2974 2975 // leave `token_hex`'s session for visitors arriving without one. only the 2976 // `try` fixture writes one. the name can't collide with a session token. 2977 pub fn offerAutoLogin(self: SessionStore, token_hex: *const [token_hex_len]u8) !void { 2978 const file = try self.dir.createFile(self.io, auto_login_name, .{}); 2979 defer file.close(self.io); 2980 try file.writeStreamingAll(self.io, token_hex); 2981 } 2982 2983 pub fn autoLogin(self: SessionStore, out: *[token_hex_len]u8) bool { 2984 out.* = self.auto_login orelse return false; 2985 return true; 2986 } 2987 2988 const auto_login_name = "auto-login"; 2989 2990 // a token is exactly token_hex_len hex chars. validating before using the 2991 // value as a path keeps attacker-supplied cookies from escaping the 2992 // sessions dir (e.g. via "/" or ".." bytes). 2993 fn isToken(token_hex: []const u8) bool { 2994 if (token_hex.len != token_hex_len) return false; 2995 for (token_hex) |c| if (!std.ascii.isHex(c)) return false; 2996 return true; 2997 } 2998 }; 2999