Nested routes

Fixes #262

appveyor.yml

@@ -10,7 +10,7 @@ build: off
 environment:
   matrix:
     # node.js
-    - nodejs_version: stable
+    - nodejs_version: 10.5
 
 install:
   - ps: Install-Product node $env:nodejs_version

components/default-layout.html

@@ -0,0 +1 @@
+<svelte:component this={child.component} {...child.props}/>

mocha.opts

@@ -1,4 +1,4 @@
 --require source-map-support/register
 --recursive
-test/unit/**/*.js
+test/unit/*/*.js
 test/common/test.js

package.json

@@ -12,6 +12,7 @@
     "runtime",
     "webpack",
     "sapper",
+    "components",
     "dist"
   ],
   "directories": {
@@ -67,7 +68,7 @@
     "cy:open": "cypress open",
     "test": "mocha --opts mocha.opts",
     "pretest": "npm run build",
-    "build": "rollup -c",
+    "build": "rm -rf dist && rollup -c",
     "dev": "rollup -cw",
     "prepublishOnly": "npm test",
     "update_mime_types": "curl http://svn.apache.org/repos/asf/httpd/httpd/trunk/docs/conf/mime.types | grep -e \"^[^#]\" > src/middleware/mime-types.md"

rollup.config.js

@@ -19,7 +19,8 @@ export default [
 		},
 		plugins: [
 			typescript({
-				typescript: require('typescript')
+				typescript: require('typescript'),
+				target: "ES2017"
 			})
 		]
 	},

src/api/dev.ts

@@ -105,8 +105,15 @@ class Watcher extends EventEmitter {
 
 		const dev_port = await ports.find(10000);
 
-		const routes = create_routes();
-		create_main_manifests({ routes, dev_port });
+		try {
+			const routes = create_routes();
+			create_main_manifests({ routes, dev_port });
+		} catch (err) {
+			this.emit('fatal', <events.FatalEvent>{
+				message: err.message
+			});
+			return;
+		}
 
 		this.dev_server = new DevServer(dev_port);
 
@@ -114,6 +121,15 @@ class Watcher extends EventEmitter {
 			watch_files(locations.routes(), ['add', 'unlink'], () => {
 				const routes = create_routes();
 				create_main_manifests({ routes, dev_port });
+
+				try {
+					const routes = create_routes();
+					create_main_manifests({ routes, dev_port });
+				} catch (err) {
+					this.emit('error', <events.ErrorEvent>{
+						message: err.message
+					});
+				}
 			}),
 
 			watch_files(`${locations.app()}/template.html`, ['change'], () => {
@@ -272,7 +288,7 @@ class Watcher extends EventEmitter {
 		if (this.closed) return;
 		this.closed = true;
 
-		this.dev_server.close();
+		if (this.dev_server) this.dev_server.close();
 
 		if (this.proc) this.proc.kill();
 		this.filewatchers.forEach(watcher => {

src/api/find_page.ts

@@ -2,15 +2,14 @@ import * as glob from 'glob';
 import { locations } from '../config';
 import { create_routes } from '../core';
 
-export function find_page(pathname: string, files: string[] = glob.sync('**/*.*', { cwd: locations.routes(), dot: true, nodir: true })) {
-	const routes = create_routes({ files });
+export function find_page(pathname: string, cwd = locations.routes()) {
+	const { pages } = create_routes(cwd);
 
-	for (let i = 0; i < routes.length; i += 1) {
-		const route = routes[i];
+	for (let i = 0; i < pages.length; i += 1) {
+		const page = pages[i];
 
-		if (route.pattern.test(pathname)) {
-			const page = route.handlers.find(handler => handler.type === 'page');
-			if (page) return page.file;
+		if (page.pattern.test(pathname)) {
+			return page.parts[page.parts.length - 1].component.file;
 		}
 	}
 }

src/core/create_manifests.ts

@@ -3,10 +3,10 @@ import * as path from 'path';
 import * as glob from 'glob';
 import { posixify, write_if_changed } from './utils';
 import { dev, locations } from '../config';
-import { Route } from '../interfaces';
+import { Page, PageComponent, ServerRoute } from '../interfaces';
 
 export function create_main_manifests({ routes, dev_port }: {
-	routes: Route[];
+	routes: { components: PageComponent[], pages: Page[], server_routes: ServerRoute[] };
 	dev_port?: number;
 }) {
 	const path_to_routes = path.relative(`${locations.app()}/manifest`, locations.routes());
@@ -14,12 +14,16 @@ export function create_main_manifests({ routes, dev_port }: {
 	const client_manifest = generate_client(routes, path_to_routes, dev_port);
 	const server_manifest = generate_server(routes, path_to_routes);
 
+	write_if_changed(
+		`${locations.app()}/manifest/default-layout.html`,
+		`<svelte:component this={child.component} {...child.props}/>`
+	);
 	write_if_changed(`${locations.app()}/manifest/client.js`, client_manifest);
 	write_if_changed(`${locations.app()}/manifest/server.js`, server_manifest);
 }
 
 export function create_serviceworker_manifest({ routes, client_files }: {
-	routes: Route[];
+	routes: { components: PageComponent[], pages: Page[], server_routes: ServerRoute[] };
 	client_files: string[];
 }) {
 	const assets = glob.sync('**', { cwd: 'assets', nodir: true });
@@ -32,42 +36,67 @@ export function create_serviceworker_manifest({ routes, client_files }: {
 
 		export const shell = [\n\t${client_files.map((x: string) => `"${x}"`).join(',\n\t')}\n];
 
-		export const routes = [\n\t${routes.pages.filter(r => r.id !== '_error').map((r: Route) => `{ pattern: ${r.pattern} }`).join(',\n\t')}\n];
+		export const routes = [\n\t${routes.pages.map((r: Page) => `{ pattern: ${r.pattern} }`).join(',\n\t')}\n];
 	`.replace(/^\t\t/gm, '').trim();
 
 	write_if_changed(`${locations.app()}/manifest/service-worker.js`, code);
 }
 
-function generate_client(routes: Route[], path_to_routes: string, dev_port?: number) {
-	const page_ids = new Set(routes.pages.map(page => page.id));
-	const server_routes_to_ignore = routes.server_routes.filter(route => !page_ids.has(route.id));
+function right_pad(str: string, len: number) {
+	while (str.length < len) str += ' ';
+	return str;
+}
 
-	const pages = routes.pages.filter(page => page.id !== '_error');
-	const error_route = routes.pages.find(page => page.id === '_error');
+function generate_client(
+	routes: { root: PageComponent, components: PageComponent[], pages: Page[], server_routes: ServerRoute[] },
+	path_to_routes: string,
+	dev_port?: number
+) {
+	const page_ids = new Set(routes.pages.map(page =>
+		page.pattern.toString()));
+
+	const server_routes_to_ignore = routes.server_routes.filter(route =>
+		!page_ids.has(route.pattern.toString()));
+
+	const len = Math.max(...routes.components.map(c => c.name.length));
 
 	let code = `
 		// This file is generated by Sapper — do not edit it!
-		export const routes = {
+		import root from '${posixify(`${path_to_routes}/${routes.root.file}`)}';
+		import error from '${posixify(`${path_to_routes}/_error.html`)}';
+
+		${routes.components.map(component =>
+		`const ${component.name} = () =>
+			import(/* webpackChunkName: "${component.name}" */ '${get_file(path_to_routes, component)}');`)
+		.join('\n')}
+
+		export const manifest = {
 			ignore: [${server_routes_to_ignore.map(route => route.pattern).join(', ')}],
 
 			pages: [
-				${pages.map(page => {
-					const file = posixify(`${path_to_routes}/${page.file}`);
+				${routes.pages.map(page => `{
+					// ${page.parts[page.parts.length - 1].component.file}
+					pattern: ${page.pattern},
+					parts: [
+						${page.parts.map(part => {
+							if (part.params.length > 0) {
+								const props = part.params.map((param, i) => `${param}: match[${i + 1}]`);
+								return `{ component: ${part.component.name}, params: match => ({ ${props.join(', ')} }) }`;
+							}
 
-					if (page.id === '_error') {
-						return `{ error: true, load: () => import(/* webpackChunkName: "${page.id}" */ '${file}') }`;
-					}
-
-					const params = page.params.length === 0
-						? '{}'
-						: `{ ${page.params.map((part, i) => `${part}: match[${i + 1}]`).join(', ')} }`;
-
-					return `{ pattern: ${page.pattern}, params: ${page.params.length > 0 ? `match` : `()`} => (${params}), load: () => import(/* webpackChunkName: "${page.id}" */ '${file}') }`;
-				}).join(',\n\t\t\t\t')}
+							return `{ component: ${part.component.name} }`;
+						}).join(',\n\t\t\t\t\t\t')}
+					]
+				}`).join(',\n\n\t\t\t\t')}
 			],
 
-			error: () => import(/* webpackChunkName: '_error' */ '${posixify(`${path_to_routes}/${error_route.file}`)}')
-		};`.replace(/^\t\t/gm, '').trim();
+			root,
+
+			error
+		};
+
+		// this is included for legacy reasons
+		export const routes = {};`.replace(/^\t\t/gm, '').trim();
 
 	if (dev()) {
 		const sapper_dev_client = posixify(
@@ -86,47 +115,72 @@ function generate_client(routes: Route[], path_to_routes: string, dev_port?: num
 	return code;
 }
 
-function generate_server(routes: Route[], path_to_routes: string) {
-	const error_route = routes.pages.find(page => page.id === '_error');
-
+function generate_server(
+	routes: { root: PageComponent, components: PageComponent[], pages: Page[], server_routes: ServerRoute[] },
+	path_to_routes: string
+) {
 	const imports = [].concat(
 		routes.server_routes.map(route =>
-			`import * as route_${route.id} from '${posixify(`${path_to_routes}/${route.file}`)}';`),
-		routes.pages.map(page =>
-			`import page_${page.id} from '${posixify(`${path_to_routes}/${page.file}`)}';`),
-		`import error from '${posixify(`${path_to_routes}/${error_route.file}`)}';`
+			`import * as ${route.name} from '${posixify(`${path_to_routes}/${route.file}`)}';`),
+		routes.components.map(component =>
+			`import ${component.name} from '${get_file(path_to_routes, component)}';`),
+		`import root from '${posixify(`${path_to_routes}/${routes.root.file}`)}';`,
+		`import error from '${posixify(`${path_to_routes}/_error.html`)}';`
 	);
 
 	let code = `
 		// This file is generated by Sapper — do not edit it!
 		${imports.join('\n')}
 
-		export const routes = {
+		export const manifest = {
 			server_routes: [
-				${routes.server_routes.map(route => {
-					const params = route.params.length === 0
-						? '{}'
-						: `{ ${route.params.map((part, i) => `${part}: match[${i + 1}]`).join(', ')} }`;
-
-					return `{ id: '${route.id}', pattern: ${route.pattern}, params: ${route.params.length > 0 ? `match` : `()`} => (${params}), handlers: route_${route.id} }`;
-				}).join(',\n\t\t\t\t')}
+				${routes.server_routes.map(route => `{
+					// ${route.file}
+					pattern: ${route.pattern},
+					handlers: ${route.name},
+					params: ${route.params.length > 0
+						? `match => ({ ${route.params.map((param, i) => `${param}: match[${i + 1}]`).join(', ')} })`
+						: `() => ({})`}
+				}`).join(',\n\n\t\t\t\t')}
 			],
 
 			pages: [
-				${routes.pages.map(page => {
-					const params = page.params.length === 0
-						? '{}'
-						: `{ ${page.params.map((part, i) => `${part}: match[${i + 1}]`).join(', ')} }`;
+				${routes.pages.map(page => `{
+					// ${page.parts[page.parts.length - 1].component.file}
+					pattern: ${page.pattern},
+					parts: [
+						${page.parts.map(part => {
+							const props = [
+								`name: "${part.component.name}"`,
+								`component: ${part.component.name}`
+							];
 
-					return `{ id: '${page.id}', pattern: ${page.pattern}, params: ${page.params.length > 0 ? `match` : `()`} => (${params}), handler: page_${page.id} }`;
-				}).join(',\n\t\t\t\t')}
+							if (part.params.length > 0) {
+								const params = part.params.map((param, i) => `${param}: match[${i + 1}]`);
+								props.push(`params: match => ({ ${params.join(', ')} })`);
+							}
+
+							return `{ ${props.join(', ')} }`;
+						}).join(',\n\t\t\t\t\t\t')}
+					]
+				}`).join(',\n\n\t\t\t\t')}
 			],
 
-			error: {
-				error: true,
-				handler: error
-			}
-		};`.replace(/^\t\t/gm, '').trim();
+			root,
+
+			error
+		};
+
+		// this is included for legacy reasons
+		export const routes = {};`.replace(/^\t\t/gm, '').trim();
 
 	return code;
+}
+
+function get_file(path_to_routes: string, component: PageComponent) {
+	if (component.default) {
+		return `./default-layout.html`;
+	}
+
+	return posixify(`${path_to_routes}/${component.file}`);
 }

src/core/create_routes.ts

@@ -1,186 +1,306 @@
+import * as fs from 'fs';
 import * as path from 'path';
-import glob from 'glob';
 import { locations } from '../config';
-import { Route } from '../interfaces';
+import { Page, PageComponent, ServerRoute } from '../interfaces';
+import { posixify } from './utils';
 
-export default function create_routes({
-	files
-} = {
-	files: glob.sync('**/*.*', {
-		cwd: locations.routes(),
-		dot: true,
-		nodir: true
-	})
-}) {
-	const all_routes = files
-		.filter((file: string) => !/(^|\/|\\)(_(?!error\.html)|\.(?!well-known))/.test(file))
-		.map((file: string) => {
-			if (/]\[/.test(file)) {
-				throw new Error(`Invalid route ${file} — parameters must be separated`);
-			}
+const default_layout_file = posixify(path.resolve(
+	__dirname,
+	'../components/default-layout.html'
+));
 
-			if (file === '4xx.html' || file === '5xx.html') {
-				throw new Error('As of Sapper 0.14, 4xx.html and 5xx.html should be replaced with _error.html');
-			}
+export default function create_routes(cwd = locations.routes()) {
+	const components: PageComponent[] = [];
+	const pages: Page[] = [];
+	const server_routes: ServerRoute[] = [];
 
-			const base = file.replace(/\.[^/.]+$/, '');
-			const parts = base.split('/'); // glob output is always posix-style
-			if (/^index(\..+)?/.test(parts[parts.length - 1])) {
-				const part = parts.pop();
-				if (parts.length > 0) parts[parts.length - 1] += part.slice(5);
-			}
+	const default_layout: PageComponent = {
+		default: true,
+		name: '_default_layout',
+		file: null
+	};
 
-			const id = (
-				parts.join('_').replace(/[[\]]/g, '$').replace(/^\d/, '_$&').replace(/[^a-zA-Z0-9_$]/g, '_')
-			) || '_';
+	function walk(
+		dir: string,
+		parent_segments: Part[][],
+		parent_params: string[],
+		stack: Array<{
+			component: PageComponent,
+			params: string[]
+		}>
+	) {
+		const items = fs.readdirSync(dir)
+			.map(basename => {
+				const resolved = path.join(dir, basename);
+				const file = path.relative(cwd, resolved);
+				const is_dir = fs.statSync(resolved).isDirectory();
 
-			const type = file.endsWith('.html') ? 'page' : 'route';
+				const segment = is_dir
+					? basename
+					: basename.slice(0, -path.extname(basename).length);
 
-			const params: string[] = [];
-			const match_patterns: Record<string, string> = {};
-			const param_pattern = /\[([^\(\]]+)(?:\((.+?)\))?\]/g;
+				const parts = get_parts(segment);
+				const is_index = is_dir ? false : basename.startsWith('index.');
+				const is_page = path.extname(basename) === '.html';
 
-			let match;
-			while (match = param_pattern.exec(base)) {
-				params.push(match[1]);
-				if (typeof match[2] !== 'undefined') {
-					if (/[\(\)\?\:]/.exec(match[2])) {
-						throw new Error('Sapper does not allow (, ), ? or : in RegExp routes yet');
+				parts.forEach(part => {
+					if (/\]\[/.test(part.content)) {
+						throw new Error(`Invalid route ${file} — parameters must be separated`);
 					}
-					// Make a map of the regexp patterns
-					match_patterns[match[1]] = `(${match[2]}?)`;
-				}
-			}
 
-			// TODO can we do all this with sub-parts? or does
-			// nesting make that impossible?
-			let pattern_string = '';
-			let i = parts.length;
-			let nested = true;
-			while (i--) {
-				const part = encodeURI(parts[i].normalize()).replace(/\?/g, '%3F').replace(/#/g, '%23').replace(/%5B/g, '[').replace(/%5D/g, ']');
-				const dynamic = ~part.indexOf('[');
-
-				if (dynamic) {
-					// Get keys from part and replace with stored match patterns
-					const keys = part.replace(/\(.*?\)/, '').split(/[\[\]]/).filter((x, i) => { if (i % 2) return x });
-					let matcher = part;
-					keys.forEach(k => {
-						const key_pattern = new RegExp('\\[' + k + '(?:\\((.+?)\\))?\\]');
-						matcher = matcher.replace(key_pattern, match_patterns[k] || `([^/]+?)`);
-					})
-					pattern_string = (nested && type === 'page') ? `(?:\\/${matcher}${pattern_string})?` : `\\/${matcher}${pattern_string}`;
-				} else {
-					nested = false;
-					pattern_string = `\\/${part}${pattern_string}`;
-				}
-			}
-
-			const pattern = new RegExp(`^${pattern_string}\\/?$`);
-
-			const test = (url: string) => pattern.test(url);
-
-			const exec = (url: string) => {
-				const match = pattern.exec(url);
-				if (!match) return;
-
-				const result: Record<string, string> = {};
-				params.forEach((param, i) => {
-					result[param] = match[i + 1];
+					if (part.qualifier && /[\(\)\?\:]/.test(part.qualifier.slice(1, -1))) {
+						throw new Error(`Invalid route ${file} — cannot use (, ), ? or : in route qualifiers`);
+					}
 				});
 
-				return result;
-			};
+				return {
+					basename,
+					parts,
+					file: posixify(file),
+					is_dir,
+					is_index,
+					is_page
+				};
+			})
+			.sort(comparator);
 
-			return {
-				id,
-				base,
-				type,
-				file,
-				pattern,
-				test,
-				exec,
-				parts,
-				params
-			};
+		items.forEach(item => {
+			if (item.basename[0] === '_') return;
+
+			if (item.basename[0] === '.') {
+				if (item.file !== '.well-known') return;
+			}
+
+			const segments = parent_segments.slice();
+
+			if (item.is_index && segments.length > 0) {
+				const last_segment = segments[segments.length - 1].slice();
+				const suffix = item.basename
+					.slice(0, -path.extname(item.basename).length).
+					replace('index', '');
+
+				if (suffix) {
+					const last_part = last_segment[last_segment.length - 1];
+					if (last_part.dynamic) {
+						last_segment.push({ dynamic: false, content: suffix });
+					} else {
+						last_segment[last_segment.length - 1] = {
+							dynamic: false,
+							content: `${last_part.content}${suffix}`
+						};
+					}
+
+					segments[segments.length - 1] = last_segment;
+				}
+			} else {
+				segments.push(item.parts);
+			}
+
+			const params = parent_params.slice();
+			params.push(...item.parts.filter(p => p.dynamic).map(p => p.content));
+
+			if (item.is_dir) {
+				const index = path.join(dir, item.basename, '_layout.html');
+				const layout = fs.existsSync(index)
+					? {
+						name: `${get_slug(item.file)}__layout`,
+						file: `${item.file}/_layout.html`
+					}
+					: null;
+
+				if (layout) {
+					components.push(layout);
+				} else if (components.indexOf(default_layout) === -1) {
+					components.push(default_layout);
+				}
+
+				walk(
+					path.join(dir, item.basename),
+					segments,
+					params,
+					stack.concat({
+						component: layout || default_layout,
+						params
+					})
+				);
+			}
+
+			else if (item.is_page) {
+				const component = {
+					name: get_slug(item.file),
+					file: item.file
+				};
+
+				const parts = stack.concat({
+					component,
+					params
+				});
+
+				components.push(component);
+				if (item.basename === 'index.html') {
+					pages.push({
+						pattern: get_pattern(parent_segments),
+						parts
+					});
+				} else {
+					pages.push({
+						pattern: get_pattern(segments),
+						parts
+					});
+				}
+			}
+
+			else {
+				server_routes.push({
+					name: `route_${get_slug(item.file)}`,
+					pattern: get_pattern(segments),
+					file: item.file,
+					params: params
+				});
+			}
 		});
+	}
 
-	const pages = all_routes
-		.filter(r => r.type === 'page')
-		.sort(comparator);
+	const root_file = path.join(cwd, '_layout.html');
+	const root = fs.existsSync(root_file)
+		? {
+			name: 'main',
+			file: '_layout.html'
+		}
+		: default_layout;
 
-	const server_routes = all_routes
-		.filter(r => r.type === 'route')
-		.sort(comparator);
+	walk(cwd, [], [], []);
 
-	return { pages, server_routes };
+	// check for clashes
+	const seen_pages: Map<string, Page> = new Map();
+	pages.forEach(page => {
+		const pattern = page.pattern.toString();
+		if (seen_pages.has(pattern)) {
+			const file = page.parts.pop().component.file;
+			const other_page = seen_pages.get(pattern);
+			const other_file = other_page.parts.pop().component.file;
+
+			throw new Error(`The ${other_file} and ${file} pages clash`);
+		}
+
+		seen_pages.set(pattern, page);
+	});
+
+	const seen_routes: Map<string, ServerRoute> = new Map();
+	server_routes.forEach(route => {
+		const pattern = route.pattern.toString();
+		if (seen_routes.has(pattern)) {
+			const other_route = seen_routes.get(pattern);
+			throw new Error(`The ${other_route.file} and ${route.file} routes clash`);
+		}
+
+		seen_routes.set(pattern, route);
+	});
+
+	return {
+		root,
+		components,
+		pages,
+		server_routes
+	};
 }
 
-function comparator(a, b) {
-	if (a.parts[0] === '_error') return -1;
-	if (b.parts[0] === '_error') return 1;
+type Part = {
+	content: string;
+	dynamic: boolean;
+	qualifier?: string;
+};
+
+function comparator(
+	a: { basename: string, parts: Part[], file: string, is_index: boolean },
+	b: { basename: string, parts: Part[], file: string, is_index: boolean }
+) {
+	if (a.is_index !== b.is_index) return a.is_index ? -1 : 1;
 
 	const max = Math.max(a.parts.length, b.parts.length);
 
 	for (let i = 0; i < max; i += 1) {
-		const a_part = a.parts[i];
-		const b_part = b.parts[i];
+		const a_sub_part = a.parts[i];
+		const b_sub_part = b.parts[i];
 
-		if (!a_part) return -1;
-		if (!b_part) return 1;
+		if (!a_sub_part) return 1; // b is more specific, so goes first
+		if (!b_sub_part) return -1;
 
-		const a_sub_parts = get_sub_parts(a_part);
-		const b_sub_parts = get_sub_parts(b_part);
-		const max = Math.max(a_sub_parts.length, b_sub_parts.length);
+		if (a_sub_part.dynamic !== b_sub_part.dynamic) {
+			return a_sub_part.dynamic ? 1 : -1;
+		}
 
-		for (let i = 0; i < max; i += 1) {
-			const a_sub_part = a_sub_parts[i];
-			const b_sub_part = b_sub_parts[i];
+		if (!a_sub_part.dynamic && a_sub_part.content !== b_sub_part.content) {
+			return (
+				(b_sub_part.content.length - a_sub_part.content.length) ||
+				(a_sub_part.content < b_sub_part.content ? -1 : 1)
+			);
+		}
 
-			if (!a_sub_part) return 1; // b is more specific, so goes first
-			if (!b_sub_part) return -1;
+		// If both parts dynamic, check for regexp patterns
+		if (a_sub_part.dynamic && b_sub_part.dynamic) {
+			const regexp_pattern = /\((.*?)\)/;
+			const a_match = regexp_pattern.exec(a_sub_part.content);
+			const b_match = regexp_pattern.exec(b_sub_part.content);
 
-			if (a_sub_part.dynamic !== b_sub_part.dynamic) {
-				return a_sub_part.dynamic ? 1 : -1;
+			if (!a_match && b_match) {
+				return 1; // No regexp, so less specific than b
 			}
-
-			if (!a_sub_part.dynamic && a_sub_part.content !== b_sub_part.content) {
-				return (
-					(b_sub_part.content.length - a_sub_part.content.length) ||
-					(a_sub_part.content < b_sub_part.content ? -1 : 1)
-				);
+			if (!b_match && a_match) {
+				return -1;
 			}
-
-			// If both parts dynamic, check for regexp patterns
-			if (a_sub_part.dynamic && b_sub_part.dynamic) {
-				const regexp_pattern = /\((.*?)\)/;
-				const a_match = regexp_pattern.exec(a_sub_part.content);
-				const b_match = regexp_pattern.exec(b_sub_part.content);
-
-				if (!a_match && b_match) {
-					return 1; // No regexp, so less specific than b
-				}
-				if (!b_match && a_match) {
-					return -1;
-				}
-				if (a_match && b_match && a_match[1] !== b_match[1]) {
-					return b_match[1].length - a_match[1].length;
-				}
+			if (a_match && b_match && a_match[1] !== b_match[1]) {
+				return b_match[1].length - a_match[1].length;
 			}
 		}
 	}
-
-	throw new Error(`The ${a.base} and ${b.base} routes clash`);
 }
 
-function get_sub_parts(part: string) {
+function get_parts(part: string): Part[] {
 	return part.split(/\[(.+)\]/)
-		.map((content, i) => {
-			if (!content) return null;
+		.map((str, i) => {
+			if (!str) return null;
+			const dynamic = i % 2 === 1;
+
+			const [, content, qualifier] = dynamic
+				? /([^(]+)(\(.+\))?$/.exec(str)
+				: [, str, null];
+
 			return {
 				content,
-				dynamic: i % 2 === 1
+				dynamic,
+				qualifier
 			};
 		})
 		.filter(Boolean);
+}
+
+function get_slug(file: string) {
+	return file
+		.replace(/[\\\/]index/, '')
+		.replace(/_default([\/\\index])?\.html$/, 'index')
+		.replace(/[\/\\]/g, '_')
+		.replace(/\.\w+$/, '')
+		.replace(/\[([^(]+)(?:\([^(]+\))?\]/, '$$$1')
+		.replace(/[^a-zA-Z0-9_$]/g, c => {
+			return c === '.' ? '_' : `$${c.charCodeAt(0)}`
+		});
+}
+
+function get_pattern(segments: Part[][]) {
+	return new RegExp(
+		`^` +
+		segments.map(segment => {
+			return '\\/' + segment.map(part => {
+				return part.dynamic
+					? part.qualifier || '([^\\/]+?)'
+					: encodeURI(part.content.normalize())
+						.replace(/\?/g, '%3F')
+						.replace(/#/g, '%23')
+						.replace(/%5B/g, '[')
+						.replace(/%5D/g, ']');
+			}).join('');
+		}).join('') +
+		'\\\/?$'
+	);
 }

src/interfaces.ts

@@ -18,4 +18,25 @@ export type Template = {
 
 export type Store = {
 	get: () => any;
+};
+
+export type PageComponent = {
+	default?: boolean;
+	name: string;
+	file: string;
+};
+
+export type Page = {
+	pattern: RegExp;
+	parts: Array<{
+		component: PageComponent;
+		params: string[];
+	}>
+};
+
+export type ServerRoute = {
+	name: string;
+	pattern: RegExp;
+	file: string;
+	params: string[];
 };

src/middleware.ts

@@ -11,13 +11,26 @@ import sourceMapSupport from 'source-map-support';
 
 sourceMapSupport.install();
 
-type RouteObject = {
-	id: string;
-	type: 'page' | 'route';
+type ServerRoute = {
 	pattern: RegExp;
+	handlers: Record<string, Handler>;
 	params: (match: RegExpMatchArray) => Record<string, string>;
-	module: Component;
-	error?: string;
+};
+
+type Page = {
+	pattern: RegExp;
+	parts: Array<{
+		name: string;
+		component: Component;
+		params?: (match: RegExpMatchArray) => Record<string, string>;
+	}>
+};
+
+type Manifest = {
+	server_routes: ServerRoute[];
+	pages: Page[];
+	root: Component;
+	error: Component;
 }
 
 type Handler = (req: Req, res: ServerResponse, next: () => void) => void;
@@ -26,6 +39,20 @@ type Store = {
 	get: () => any
 };
 
+type Props = {
+	path: string;
+	query: Record<string, string>;
+	params: Record<string, string>;
+	error?: { message: string };
+	status?: number;
+	child: {
+		segment: string;
+		component: Component;
+		props: Props;
+	};
+	[key: string]: any;
+};
+
 interface Req extends ClientRequest {
 	url: string;
 	baseUrl: string;
@@ -33,6 +60,7 @@ interface Req extends ClientRequest {
 	method: string;
 	path: string;
 	params: Record<string, string>;
+	query: Record<string, string>;
 	headers: Record<string, string>;
 }
 
@@ -45,17 +73,19 @@ interface Component {
 	preload: (data: any) => any | Promise<any>
 }
 
-export default function middleware({ App, routes, store }: {
-	App: Component,
-	routes: RouteObject[],
-	store: (req: Req) => Store
+export default function middleware(opts: {
+	manifest: Manifest,
+	store: (req: Req) => Store,
+	routes?: any // legacy
 }) {
-	if (!App) {
-		throw new Error(`As of 0.12, you must supply an App component to Sapper — see https://sapper.svelte.technology/guide#0-11-to-0-12 for more information`);
+	if (opts.routes) {
+		throw new Error(`As of Sapper 0.15, opts.routes should be opts.manifest`);
 	}
 
 	const output = locations.dest();
 
+	const { manifest, store } = opts;
+
 	let emitted_basepath = false;
 
 	const middleware = compose_handlers([
@@ -108,8 +138,8 @@ export default function middleware({ App, routes, store }: {
 			cache_control: 'max-age=31536000'
 		}),
 
-		get_server_route_handler(routes.server_routes),
-		get_page_handler(App, routes, store)
+		get_server_route_handler(manifest.server_routes),
+		get_page_handler(manifest, store)
 	].filter(Boolean));
 
 	return middleware;
@@ -152,8 +182,8 @@ function serve({ prefix, pathname, cache_control }: {
 	};
 }
 
-function get_server_route_handler(routes: RouteObject[]) {
-	function handle_route(route, req, res, next) {
+function get_server_route_handler(routes: ServerRoute[]) {
+	function handle_route(route: ServerRoute, req: Req, res: ServerResponse, next: () => void) {
 		req.params = route.params(route.pattern.exec(req.path));
 
 		const method = req.method.toLowerCase();
@@ -196,7 +226,6 @@ function get_server_route_handler(routes: RouteObject[]) {
 
 			const handle_next = (err?: Error) => {
 				if (err) {
-					console.error(err.stack);
 					res.statusCode = 500;
 					res.end(err.message);
 				} else {
@@ -215,7 +244,7 @@ function get_server_route_handler(routes: RouteObject[]) {
 		}
 	}
 
-	return function find_route(req: Req, res: ServerResponse, next) {
+	return function find_route(req: Req, res: ServerResponse, next: () => void) {
 		for (const route of routes) {
 			if (route.pattern.test(req.path)) {
 				handle_route(route, req, res, next);
@@ -227,7 +256,7 @@ function get_server_route_handler(routes: RouteObject[]) {
 	};
 }
 
-function get_page_handler(App: Component, routes: RouteObject[], store_getter: (req: Req) => Store) {
+function get_page_handler(manifest: Manifest, store_getter: (req: Req) => Store) {
 	const output = locations.dest();
 
 	const get_chunks = dev()
@@ -238,22 +267,37 @@ function get_page_handler(App: Component, routes: RouteObject[], store_getter: (
 		? () => fs.readFileSync(`${locations.app()}/template.html`, 'utf-8')
 		: (str => () => str)(fs.readFileSync(`${locations.dest()}/template.html`, 'utf-8'));
 
-	const { server_routes, pages } = routes;
-	const error_route = routes.error;
+	const { server_routes, pages } = manifest;
+	const error_route = manifest.error;
 
-	function handle_route(route: RouteObject, req: Req, res: ServerResponse, status = 200, error: Error | string = null) {
-		req.params = error
-			? {}
-			: route.params(route.pattern.exec(req.path));
+	function handle_error(req: Req, res: ServerResponse, statusCode: number, error: Error | string) {
+		handle_page({
+			pattern: null,
+			parts: [
+				{ name: null, component: error_route }
+			]
+		}, req, res, statusCode, error);
+	}
 
-		const chunks: Record<string, string> = get_chunks();
+	function handle_page(page: Page, req: Req, res: ServerResponse, status = 200, error: Error | string = null) {
+		const get_params = page.parts[page.parts.length - 1].params || (() => ({}));
+		const match = error ? null : page.pattern.exec(req.path);
+
+		const chunks: Record<string, string | string[]> = get_chunks();
 
 		res.setHeader('Content-Type', 'text/html');
 
 		// preload main.js and current route
 		// TODO detect other stuff we can preload? images, CSS, fonts?
-		const link = []
-			.concat(chunks.main, chunks[route.id] || chunks._error) // TODO this is gross
+		let preloaded_chunks = Array.isArray(chunks.main) ? chunks.main : [chunks.main];
+		if (!error) {
+			page.parts.forEach(part => {
+				// using concat because it could be a string or an array. thanks webpack!
+				preloaded_chunks = preloaded_chunks.concat(chunks[part.name]);
+			});
+		}
+
+		const link = preloaded_chunks
 			.filter(file => !file.match(/\.map$/))
 			.map(file => `<${req.baseUrl}/client/${file}>;rel="preload";as="script"`)
 			.join(', ');
@@ -261,63 +305,77 @@ function get_page_handler(App: Component, routes: RouteObject[], store_getter: (
 		res.setHeader('Link', link);
 
 		const store = store_getter ? store_getter(req) : null;
-		const props = { params: req.params, query: req.query, path: req.path };
-
-		if (route.error) {
-			props.error = error instanceof Error ? error : { message: error };
-			props.status = status;
-		}
 
 		let redirect: { statusCode: number, location: string };
 		let preload_error: { statusCode: number, message: Error | string };
 
-		Promise.resolve(
-			route.handler.preload ? route.handler.preload.call({
-				redirect: (statusCode: number, location: string) => {
-					redirect = { statusCode, location };
-				},
-				error: (statusCode: number, message: Error | string) => {
-					preload_error = { statusCode, message };
-				},
-				fetch: (url: string, opts?: any) => {
-					const parsed = new URL(url, `http://127.0.0.1:${process.env.PORT}${req.baseUrl ? req.baseUrl + '/'  :''}`);
+		const preload_context = {
+			redirect: (statusCode: number, location: string) => {
+				if (redirect && (redirect.statusCode !== statusCode || redirect.location !== location)) {
+					throw new Error(`Conflicting redirects`);
+				}
+				redirect = { statusCode, location };
+			},
+			error: (statusCode: number, message: Error | string) => {
+				preload_error = { statusCode, message };
+			},
+			fetch: (url: string, opts?: any) => {
+				const parsed = new URL(url, `http://127.0.0.1:${process.env.PORT}${req.baseUrl ? req.baseUrl + '/' :''}`);
 
-					if (opts) {
-						opts = Object.assign({}, opts);
+				if (opts) {
+					opts = Object.assign({}, opts);
 
-						const include_cookies = (
-							opts.credentials === 'include' ||
-							opts.credentials === 'same-origin' && parsed.origin === `http://127.0.0.1:${process.env.PORT}`
-						);
+					const include_cookies = (
+						opts.credentials === 'include' ||
+						opts.credentials === 'same-origin' && parsed.origin === `http://127.0.0.1:${process.env.PORT}`
+					);
 
-						if (include_cookies) {
-							const cookies: Record<string, string> = {};
-							if (!opts.headers) opts.headers = {};
+					if (include_cookies) {
+						const cookies: Record<string, string> = {};
+						if (!opts.headers) opts.headers = {};
 
-							const str = []
-								.concat(
-									cookie.parse(req.headers.cookie || ''),
-									cookie.parse(opts.headers.cookie || ''),
-									cookie.parse(res.getHeader('Set-Cookie') || '')
-								)
-								.map(cookie => {
-									return Object.keys(cookie)
-										.map(name => `${name}=${encodeURIComponent(cookie[name])}`)
-										.join('; ');
-								})
-								.filter(Boolean)
-								.join(', ');
+						const str = []
+							.concat(
+								cookie.parse(req.headers.cookie || ''),
+								cookie.parse(opts.headers.cookie || ''),
+								cookie.parse(res.getHeader('Set-Cookie') || '')
+							)
+							.map(cookie => {
+								return Object.keys(cookie)
+									.map(name => `${name}=${encodeURIComponent(cookie[name])}`)
+									.join('; ');
+							})
+							.filter(Boolean)
+							.join(', ');
 
-							opts.headers.cookie = str;
-						}
+						opts.headers.cookie = str;
 					}
+				}
 
-					return fetch(parsed.href, opts);
-				},
+				return fetch(parsed.href, opts);
+			},
 			store
-			}, req) : {}
-		).catch(err => {
+		};
+
+		const root_preloaded = manifest.root.preload
+			? manifest.root.preload.call(preload_context, {
+				path: req.path,
+				query: req.query,
+				params: {}
+			})
+			: {};
+
+		Promise.all([root_preloaded].concat(page.parts.map(part => {
+			return part.component.preload
+				? part.component.preload.call(preload_context, {
+					path: req.path,
+					query: req.query,
+					params: part.params ? part.params(match) : {}
+				})
+				: {};
+		}))).catch(err => {
 			preload_error = { statusCode: 500, message: err };
+			return []; // appease TypeScript
 		}).then(preloaded => {
 			if (redirect) {
 				res.statusCode = redirect.statusCode;
@@ -328,17 +386,52 @@ function get_page_handler(App: Component, routes: RouteObject[], store_getter: (
 			}
 
 			if (preload_error) {
-				handle_route(error_route, req, res, preload_error.statusCode, preload_error.message);
+				handle_error(req, res, preload_error.statusCode, preload_error.message);
 				return;
 			}
 
 			const serialized = {
-				preloaded: route.handler.preload && try_serialize(preloaded),
+				preloaded: `[${preloaded.map(data => try_serialize(data)).join(',')}]`,
 				store: store && try_serialize(store.get())
 			};
-			Object.assign(props, preloaded);
 
-			const { html, head, css } = App.render({ Page: route.handler, props }, {
+			const segments = req.path.split('/').filter(Boolean);
+
+			const props: Props = {
+				path: req.path,
+				query: req.query,
+				params: {},
+				child: null
+			};
+
+			if (error) {
+				props.error = error instanceof Error ? error : { message: error };
+				props.status = status;
+			}
+
+			const data = Object.assign({}, props, preloaded[0], {
+				params: {},
+				child: {}
+			});
+
+			let level = data.child;
+			for (let i = 0; i < page.parts.length; i += 1) {
+				const part = page.parts[i];
+				const get_params = part.params || (() => ({}));
+
+				Object.assign(level, {
+					segment: segments[i],
+					component: part.component,
+					props: Object.assign({}, props, {
+						params: get_params(match)
+					}, preloaded[i + 1])
+				});
+
+				level.props.child = <Props["child"]>{};
+				level = level.props.child;
+			}
+
+			const { html, head, css } = manifest.root.render(data, {
 				store
 			});
 
@@ -349,6 +442,7 @@ function get_page_handler(App: Component, routes: RouteObject[], store_getter: (
 				.join('');
 
 			let inline_script = `__SAPPER__={${[
+				error && `error:1`,
 				`baseUrl: "${req.baseUrl}"`,
 				serialized.preloaded && `preloaded: ${serialized.preloaded}`,
 				serialized.store && `store: ${serialized.store}`
@@ -359,7 +453,7 @@ function get_page_handler(App: Component, routes: RouteObject[], store_getter: (
 				inline_script += `if ('serviceWorker' in navigator) navigator.serviceWorker.register('${req.baseUrl}/service-worker.js');`;
 			}
 
-			const page = template()
+			const body = template()
 				.replace('%sapper.base%', () => `<base href="${req.baseUrl}/">`)
 				.replace('%sapper.scripts%', () => `<script>${inline_script}</script>${scripts}`)
 				.replace('%sapper.html%', () => html)
@@ -367,7 +461,7 @@ function get_page_handler(App: Component, routes: RouteObject[], store_getter: (
 				.replace('%sapper.styles%', () => (css && css.code ? `<style>${css.code}</style>` : ''));
 
 			res.statusCode = status;
-			res.end(page);
+			res.end(body);
 
 			if (process.send) {
 				process.send({
@@ -377,9 +471,17 @@ function get_page_handler(App: Component, routes: RouteObject[], store_getter: (
 					method: req.method,
 					status: 200,
 					type: 'text/html',
-					body: page
+					body
 				});
 			}
+		}).catch(err => {
+			if (error) {
+				// we encountered an error while rendering the error page — oops
+				res.statusCode = 500;
+				res.end(`<pre>${escape_html(err.message)}</pre>`);
+			} else {
+				handle_error(req, res, 500, err);
+			}
 		});
 	}
 
@@ -387,13 +489,13 @@ function get_page_handler(App: Component, routes: RouteObject[], store_getter: (
 		if (!server_routes.some(route => route.pattern.test(req.path))) {
 			for (const page of pages) {
 				if (page.pattern.test(req.path)) {
-					handle_route(page, req, res);
+					handle_page(page, req, res);
 					return;
 				}
 			}
 		}
 
-		handle_route(error_route, req, res, 404, 'Not found');
+		handle_error(req, res, 404, 'Not found');
 	};
 }
 
@@ -424,3 +526,15 @@ function try_serialize(data: any) {
 		return null;
 	}
 }
+
+function escape_html(html: string) {
+	const chars: Record<string, string> = {
+		'"' : 'quot',
+		"'": '#39',
+		'&': 'amp',
+		'<' : 'lt',
+		'>' : 'gt'
+	};
+
+	return html.replace(/["'&<>]/g, c => `&${chars[c]};`);
+}

src/runtime/index.ts

@@ -1,14 +1,39 @@
 import { detach, findAnchor, scroll_state, which } from './utils';
-import { Component, ComponentConstructor, Params, Query, Route, RouteData, ScrollPosition, Store, Target } from './interfaces';
+import { Component, ComponentConstructor, Params, Query, Redirect, Manifest, RouteData, ScrollPosition, Store, Target } from './interfaces';
 
-const manifest = typeof window !== 'undefined' && window.__SAPPER__;
+const initial_data = typeof window !== 'undefined' && window.__SAPPER__;
 
-export let App: ComponentConstructor;
-export let component: Component;
+export let root: Component;
 let target: Node;
 let store: Store;
-let routes: Route[];
-let error_route: Route;
+let manifest: Manifest;
+let segments: string[] = [];
+
+type RootProps = {
+	path: string;
+	params: Record<string, string>;
+	query: Record<string, string>;
+	child: Child;
+};
+
+type Child = {
+	segment?: string;
+	props?: any;
+	component?: Component;
+};
+
+const root_props: RootProps = {
+	path: null,
+	params: null,
+	query: null,
+	child: {
+		segment: null,
+		component: null,
+		props: {}
+	}
+};
+
+export { root as component }; // legacy reasons — drop in a future version
 
 const history = typeof window !== 'undefined' ? window.history : {
 	pushState: (state: any, title: string, href: string) => {},
@@ -26,45 +51,50 @@ if ('scrollRestoration' in history) {
 
 function select_route(url: URL): Target {
 	if (url.origin !== window.location.origin) return null;
-	if (!url.pathname.startsWith(manifest.baseUrl)) return null;
+	if (!url.pathname.startsWith(initial_data.baseUrl)) return null;
 
-	const path = url.pathname.slice(manifest.baseUrl.length);
+	const path = url.pathname.slice(initial_data.baseUrl.length);
 
 	// avoid accidental clashes between server routes and pages
-	if (routes.ignore.some(pattern => pattern.test(path))) return;
+	if (manifest.ignore.some(pattern => pattern.test(path))) return;
 
-	for (let i = 0; i < routes.pages.length; i += 1) {
-		const page = routes.pages[i];
+	for (let i = 0; i < manifest.pages.length; i += 1) {
+		const page = manifest.pages[i];
 
 		const match = page.pattern.exec(path);
 		if (match) {
-			const params = page.params(match);
-
 			const query: Record<string, string | true> = {};
 			if (url.search.length > 0) {
 				url.search.slice(1).split('&').forEach(searchParam => {
 					const [, key, value] = /([^=]+)=(.*)/.exec(searchParam);
 					query[key] = value || true;
-				})
+				});
 			}
-			return { url, route: page, props: { params, query, path } };
+			return { url, path, page, match, query };
 		}
 	}
 }
 
 let current_token: {};
 
-function render(Page: ComponentConstructor, props: any, scroll: ScrollPosition, token: {}) {
+function render(data: any, changed_from: number, scroll: ScrollPosition, token: {}) {
 	if (current_token !== token) return;
 
-	const data = {
-		Page,
-		props,
-		preloading: false
-	};
+	if (root) {
+		// first, clear out highest-level root component
+		let level = data.child;
+		for (let i = 0; i < changed_from; i += 1) {
+			if (i === changed_from) break;
+			level = level.props.child;
+		}
 
-	if (component) {
-		component.set(data);
+		const { component } = level;
+		level.component = null;
+		root.set({ child: data.child });
+
+		// then render new stuff
+		level.component = component;
+		root.set(data);
 	} else {
 		// first load — remove SSR'd <head> contents
 		const start = document.querySelector('#sapper-head-start');
@@ -76,7 +106,9 @@ function render(Page: ComponentConstructor, props: any, scroll: ScrollPosition,
 			detach(end);
 		}
 
-		component = new App({
+		Object.assign(data, root_data);
+
+		root = new manifest.root({
 			target,
 			data,
 			store,
@@ -87,52 +119,149 @@ function render(Page: ComponentConstructor, props: any, scroll: ScrollPosition,
 	if (scroll) {
 		window.scrollTo(scroll.x, scroll.y);
 	}
+
+	Object.assign(root_props, data);
+	ready = true;
 }
 
-function prepare_route(Page: ComponentConstructor, props: RouteData) {
-	let redirect: { statusCode: number, location: string } = null;
+function changed(a: Record<string, string | true>, b: Record<string, string | true>) {
+	return JSON.stringify(a) !== JSON.stringify(b);
+}
+
+let root_preload: Promise<any>;
+let root_data: any;
+
+function prepare_page(target: Target): Promise<{
+	redirect?: Redirect;
+	data?: any;
+	changed_from?: number;
+}> {
+	if (root) {
+		root.set({ preloading: true });
+	}
+
+	const { page, path, query } = target;
+	const new_segments = path.split('/').filter(Boolean);
+	let changed_from = 0;
+
+	while (
+		segments[changed_from] &&
+		new_segments[changed_from] &&
+		segments[changed_from] === new_segments[changed_from]
+	) changed_from += 1;
+
+	let redirect: Redirect = null;
 	let error: { statusCode: number, message: Error | string } = null;
 
-	if (!Page.preload) {
-		return { Page, props, redirect, error };
-	}
-
-	if (!component && manifest.preloaded) {
-		return { Page, props: Object.assign(props, manifest.preloaded), redirect, error };
-	}
-
-	if (component) {
-		component.set({
-			preloading: true
-		});
-	}
-
-	return Promise.resolve(Page.preload.call({
+	const preload_context = {
 		store,
 		fetch: (url: string, opts?: any) => window.fetch(url, opts),
 		redirect: (statusCode: number, location: string) => {
+			if (redirect && (redirect.statusCode !== statusCode || redirect.location !== location)) {
+				throw new Error(`Conflicting redirects`);
+			}
 			redirect = { statusCode, location };
 		},
 		error: (statusCode: number, message: Error | string) => {
 			error = { statusCode, message };
 		}
-	}, props)).catch(err => {
+	};
+
+	if (!root_preload) {
+		root_preload = manifest.root.preload
+			? initial_data.preloaded[0] || manifest.root.preload.call(preload_context, {
+				path,
+				query,
+				params: {}
+			})
+			: {};
+	}
+
+	return Promise.all(page.parts.map(async (part, i) => {
+		if (i < changed_from) return null;
+
+		const { default: Component } = await part.component();
+		const req = {
+			path,
+			query,
+			params: part.params ? part.params(target.match) : {}
+		};
+
+		const preloaded = ready || !initial_data.preloaded[i + 1]
+			? Component.preload ? await Component.preload.call(preload_context, req) : {}
+			: initial_data.preloaded[i + 1];
+
+		return { Component, preloaded };
+	})).catch(err => {
 		error = { statusCode: 500, message: err };
-	}).then(preloaded => {
-		if (error) {
-			return error_route().then(({ default: Page }: { default: ComponentConstructor }) => {
-				const err = error.message instanceof Error ? error.message : new Error(error.message);
-				Object.assign(props, { status: error.statusCode, error: err });
-				return { Page, props, redirect: null };
-			});
+		return [];
+	}).then(async results => {
+		if (!root_data) root_data = await root_preload;
+
+		if (redirect) {
+			return { redirect };
 		}
 
-		Object.assign(props, preloaded)
-		return { Page, props, redirect };
+		segments = new_segments;
+
+		const get_params = page.parts[page.parts.length - 1].params || (() => ({}));
+		const params = get_params(target.match);
+
+		if (error) {
+			const props = {
+				path,
+				query,
+				params,
+				error: typeof error.message === 'string' ? new Error(error.message) : error.message,
+				status: error.statusCode
+			};
+
+			return {
+				data: Object.assign({}, props, {
+					preloading: false,
+					child: {
+						component: manifest.error,
+						props
+					}
+				})
+			};
+		}
+
+		const props = { path, query };
+		const data = {
+			path,
+			preloading: false,
+			child: Object.assign({}, root_props.child)
+		};
+		if (changed(query, root_props.query)) data.query = query;
+		if (changed(params, root_props.params)) data.params = params;
+
+		let level = data.child;
+		for (let i = 0; i < page.parts.length; i += 1) {
+			const part = page.parts[i];
+			const get_params = part.params || (() => ({}));
+
+			if (i < changed_from) {
+				level.props.path = path;
+				level.props.query = query;
+				level.props.child = Object.assign({}, level.props.child);
+			} else {
+				level.segment = new_segments[i];
+				level.component = results[i].Component;
+				level.props = Object.assign({}, level.props, props, {
+					params: get_params(target.match),
+				}, results[i].preloaded);
+				level.props.child = {};
+			}
+
+			level = level.props.child;
+		}
+
+		return { data, changed_from };
 	});
 }
 
-function navigate(target: Target, id: number): Promise<any> {
+async function navigate(target: Target, id: number): Promise<any> {
 	if (id) {
 		// popstate or initial navigation
 		cid = id;
@@ -148,20 +277,19 @@ function navigate(target: Target, id: number): Promise<any> {
 
 	const loaded = prefetching && prefetching.href === target.url.href ?
 		prefetching.promise :
-		target.route.load().then(mod => prepare_route(mod.default, target.props));
+		prepare_page(target);
 
 	prefetching = null;
 
 	const token = current_token = {};
+	const { redirect, data, changed_from } = await loaded;
 
-	return loaded.then(({ Page, props, redirect }) => {
-		if (redirect) {
-			return goto(redirect.location, { replaceState: true });
-		}
-
-		render(Page, props, scroll_history[id], token);
+	if (redirect) {
+		await goto(redirect.location, { replaceState: true });
+	} else {
+		render(data, changed_from, scroll_history[id], token);
 		document.activeElement.blur();
-	});
+	}
 }
 
 function handle_click(event: MouseEvent) {
@@ -225,16 +353,16 @@ function handle_popstate(event: PopStateEvent) {
 
 let prefetching: {
 	href: string;
-	promise: Promise<{ Page: ComponentConstructor, props: any }>;
+	promise: Promise<{ redirect?: Redirect, data?: any, changed_from?: number }>;
 } = null;
 
 export function prefetch(href: string) {
-	const selected = select_route(new URL(href, document.baseURI));
+	const target: Target = select_route(new URL(href, document.baseURI));
 
-	if (selected && (!prefetching || href !== prefetching.href)) {
+	if (target && (!prefetching || href !== prefetching.href)) {
 		prefetching = {
 			href,
-			promise: selected.route.load().then(mod => prepare_route(mod.default, selected.props))
+			promise: prepare_page(target)
 		};
 	}
 }
@@ -256,19 +384,28 @@ function trigger_prefetch(event: MouseEvent | TouchEvent) {
 }
 
 let inited: boolean;
+let ready = false;
 
-export function init(opts: { App: ComponentConstructor, target: Node, routes: Route[], store?: (data: any) => Store }) {
+export function init(opts: {
+	App: ComponentConstructor,
+	target: Node,
+	manifest: Manifest,
+	store?: (data: any) => Store,
+	routes?: any // legacy
+}) {
 	if (opts instanceof HTMLElement) {
 		throw new Error(`The signature of init(...) has changed — see https://sapper.svelte.technology/guide#0-11-to-0-12 for more information`);
 	}
 
-	App = opts.App;
+	if (opts.routes) {
+		throw new Error(`As of Sapper 0.15, opts.routes should be opts.manifest`);
+	}
+
 	target = opts.target;
-	routes = opts.routes;
-	error_route = opts.routes.error;
+	manifest = opts.manifest;
 
 	if (opts && opts.store) {
-		store = opts.store(manifest.store);
+		store = opts.store(initial_data.store);
 	}
 
 	if (!inited) { // this check makes HMR possible
@@ -292,8 +429,10 @@ export function init(opts: { App: ComponentConstructor, target: Node, routes: Ro
 
 		history.replaceState({ id: uid }, '', href);
 
-		const target = select_route(new URL(window.location.href));
-		if (target) return navigate(target, uid);
+		if (!initial_data.error) {
+			const target = select_route(new URL(window.location.href));
+			if (target) return navigate(target, uid);
+		}
 	});
 }
 
@@ -313,9 +452,9 @@ export function goto(href: string, opts = { replaceState: false }) {
 }
 
 export function prefetchRoutes(pathnames: string[]) {
-	if (!routes) throw new Error(`You must call init() first`);
+	if (!manifest) throw new Error(`You must call init() first`);
 
-	return routes.pages
+	return manifest.pages
 		.filter(route => {
 			if (!pathnames) return true;
 			return pathnames.some(pathname => route.pattern.test(pathname));

src/runtime/interfaces.ts

@@ -11,15 +11,23 @@ export interface ComponentConstructor {
 };
 
 export interface Component {
+	set: (data: any) => void;
 	destroy: () => void;
 }
 
-export type Route = {
+export type Page = {
 	pattern: RegExp;
-	load: () => Promise<{ default: ComponentConstructor }>;
-	error?: boolean;
-	params?: (match: RegExpExecArray) => Record<string, string>;
-	ignore?: boolean;
+	parts: Array<{
+		component: () => Promise<{ default: ComponentConstructor }>;
+		params?: (match: RegExpExecArray) => Record<string, string>;
+	}>;
+};
+
+export type Manifest = {
+	ignore: RegExp[];
+	root: ComponentConstructor;
+	error: () => Promise<{ default: ComponentConstructor }>;
+	pages: Page[]
 };
 
 export type ScrollPosition = {
@@ -29,6 +37,13 @@ export type ScrollPosition = {
 
 export type Target = {
 	url: URL;
-	route: Route;
-	props: RouteData;
+	path: string;
+	page: Page;
+	match: RegExpExecArray;
+	query: Record<string, string | true>;
+};
+
+export type Redirect = {
+	statusCode: number;
+	location: string;
 };

test/app/app/App.html

@@ -1,6 +0,0 @@
-{#if preloading}
-	<progress class='preloading-progress' value=0.5/>
-{/if}
-
-<svelte:component this={Page} {...props}/>
-

test/app/app/client.js

@@ -1,13 +1,11 @@
 import { init, prefetchRoutes } from '../../../runtime.js';
 import { Store } from 'svelte/store.js';
-import { routes } from './manifest/client.js';
-import App from './App.html';
+import { manifest } from './manifest/client.js';
 
 window.init = () => {
 	return init({
 		target: document.querySelector('#sapper'),
-		App,
-		routes,
+		manifest,
 		store: data => new Store(data)
 	});
 };

test/app/app/server.js

@@ -4,8 +4,7 @@ import express from 'express';
 import serve from 'serve-static';
 import sapper from '../../../dist/middleware.ts.js';
 import { Store } from 'svelte/store.js';
-import { routes } from './manifest/server.js';
-import App from './App.html'
+import { manifest } from './manifest/server.js';
 
 let pending;
 let ended;
@@ -87,8 +86,7 @@ const middlewares = [
 	},
 
 	sapper({
-		App,
-		routes,
+		manifest,
 		store: () => {
 			return new Store({
 				title: 'Stored title'

test/app/routes/[x]/[y]/[z].html

@@ -0,0 +1,20 @@
+<span>z: {segment} {count}</span>
+<a href="foo/bar/qux"></a>
+
+<script>
+	import counts from '../_counts.js';
+
+	export default {
+		preload() {
+			return {
+				count: counts.z += 1
+			};
+		},
+
+		oncreate() {
+			this.set({
+				segment: this.get().params.z
+			});
+		}
+	};
+</script>

test/app/routes/[x]/[y]/_layout.html

@@ -0,0 +1,20 @@
+<span>y: {segment} {count}</span>
+<svelte:component this={child.component} {...child.props}/>
+
+<script>
+	import counts from '../_counts.js';
+
+	export default {
+		preload() {
+			return {
+				count: counts.y += 1
+			};
+		},
+
+		oncreate() {
+			this.set({
+				segment: this.get().params.y
+			});
+		}
+	};
+</script>

test/app/routes/[x]/_counts.js

@@ -0,0 +1,5 @@
+export default {
+	x: process.browser ? 1 : 0,
+	y: process.browser ? 1 : 0,
+	z: process.browser ? 1 : 0
+};

test/app/routes/[x]/_layout.html

@@ -0,0 +1,20 @@
+<span>x: {segment} {count}</span>
+<svelte:component this={child.component} {...child.props}/>
+
+<script>
+	import counts from './_counts.js';
+
+	export default {
+		preload() {
+			return {
+				count: counts.x += 1
+			};
+		},
+
+		oncreate() {
+			this.set({
+				segment: this.get().params.x
+			});
+		}
+	};
+</script>

test/app/routes/_layout.html

@@ -0,0 +1,15 @@
+{#if preloading}
+	<progress class='preloading-progress' value=0.5/>
+{/if}
+
+<svelte:component this={child.component} {rootPreloadFunctionRan} {...child.props}/>
+
+<script>
+	export default {
+		preload() {
+			return {
+				rootPreloadFunctionRan: true
+			};
+		}
+	};
+</script>

test/app/routes/missing-index/ok.html

@@ -0,0 +1 @@
+<h1>it works</h1>

test/app/routes/preload-root.html

@@ -0,0 +1 @@
+<h1>root preload function ran: {rootPreloadFunctionRan}</h1>

test/app/routes/preload-values/index.html

@@ -0,0 +1 @@
+<svelte:component this={child.component} {...child.props}/>

test/app/routes/show-url.html

@@ -1,9 +0,0 @@
-<p>URL is {url}</p>
-
-<script>
-	export default {
-		preload({ url }) {
-			if (url) return { url };
-		}
-	};
-</script>

test/common/test.js

@@ -32,6 +32,8 @@ Nightmare.action('prefetchRoutes', function(done) {
 
 const cli = path.resolve(__dirname, '../../sapper');
 
+const wait = ms => new Promise(f => setTimeout(f, ms));
+
 describe('sapper', function() {
 	process.chdir(path.resolve(__dirname, '../app'));
 
@@ -41,7 +43,7 @@ describe('sapper', function() {
 	rimraf.sync('.sapper');
 	rimraf.sync('start.js');
 
-	this.timeout(process.env.CI ? 30000 : 10000);
+	this.timeout(process.env.CI ? 30000 : 15000);
 
 	// TODO reinstate dev tests
 	// run({
@@ -97,13 +99,12 @@ describe('sapper', function() {
 			];
 			// Client scripts that should show up in the extraction directory.
 			const expectedClientRegexes = [
-				/client\/[^/]+\/_(\.\d+)?\.js/,
-				/client\/[^/]+\/about(\.\d+)?\.js/,
-				/client\/[^/]+\/blog_\$slug\$(\.\d+)?\.js/,
-				/client\/[^/]+\/blog(\.\d+)?\.js/,
 				/client\/[^/]+\/main(\.\d+)?\.js/,
-				/client\/[^/]+\/show_url(\.\d+)?\.js/,
-				/client\/[^/]+\/slow_preload(\.\d+)?\.js/,
+				/client\/[^/]+\/index(\.\d+)?\.js/,
+				/client\/[^/]+\/about(\.\d+)?\.js/,
+				/client\/[^/]+\/blog_\$slug(\.\d+)?\.js/,
+				/client\/[^/]+\/blog(\.\d+)?\.js/,
+				/client\/[^/]+\/slow\$45preload(\.\d+)?\.js/,
 			];
 			const allPages = walkSync(dest);
 
@@ -266,8 +267,9 @@ function run({ mode, basepath = '' }) {
 					})
 					.then(requests => {
 						assert.deepEqual(requests.map(r => r.url), []);
-						return nightmare.path();
 					})
+					.then(() => wait(100))
+					.then(() => nightmare.path())
 					.then(path => {
 						assert.equal(path, `${basepath}/about`);
 						return nightmare.title();
@@ -367,16 +369,6 @@ function run({ mode, basepath = '' }) {
 					});
 			});
 
-			it('passes entire request object to preload', () => {
-				return nightmare
-					.goto(`${base}/show-url`)
-					.init()
-					.evaluate(() => document.querySelector('p').innerHTML)
-					.then(html => {
-						assert.equal(html, `URL is /show-url`);
-					});
-			});
-
 			it('calls a delete handler', () => {
 				return nightmare
 					.goto(`${base}/delete-test`)
@@ -629,6 +621,49 @@ function run({ mode, basepath = '' }) {
 						assert.equal(html.indexOf('%sapper'), -1);
 					});
 			});
+
+			it('only recreates components when necessary', () => {
+				return nightmare
+					.goto(`${base}/foo/bar/baz`)
+					.init()
+					.evaluate(() => document.querySelector('#sapper').textContent)
+					.then(text => {
+						assert.deepEqual(text.split('\n').filter(Boolean), [
+							'x: foo 1',
+							'y: bar 1',
+							'z: baz 1'
+						]);
+
+						return nightmare.click(`a`)
+							.then(() => wait(100))
+							.then(() => {
+								return nightmare.evaluate(() => document.querySelector('#sapper').textContent);
+							});
+					})
+					.then(text => {
+						assert.deepEqual(text.split('\n').filter(Boolean), [
+							'x: foo 1',
+							'y: bar 1',
+							'z: qux 2'
+						]);
+					});
+			});
+
+			it('uses a fallback index component if none is provided', () => {
+				return nightmare.goto(`${base}/missing-index/ok`)
+					.page.title()
+					.then(title => {
+						assert.equal(title, 'it works');
+					});
+			});
+
+			it('runs preload in root component', () => {
+				return nightmare.goto(`${base}/preload-root`)
+					.page.title()
+					.then(title => {
+						assert.equal(title, 'root preload function ran: true');
+					});
+			});
 		});
 
 		describe('headers', () => {
@@ -641,7 +676,7 @@ function run({ mode, basepath = '' }) {
 						'text/html'
 					);
 
-					const str = ['main', '_\\.\\d+']
+					const str = ['main', '.+?\\.\\d+']
 						.map(file => {
 							return `<${basepath}/client/[^/]+/${file}\\.js>;rel="preload";as="script"`;
 						})

test/unit/create_routes.test.js

@@ -1,366 +0,0 @@
-const assert = require('assert');
-const { create_routes } = require('../../dist/core.ts.js');
-
-describe('create_routes', () => {
-	it('encodes characters not allowed in path', () => {
-		const { server_routes } = create_routes({
-			files: [
-				'"',
-				'#',
-				'?'
-			]
-		});
-
-		assert.deepEqual(
-			server_routes.map(r => r.pattern),
-			[
-				/^\/%22\/?$/,
-				/^\/%23\/?$/,
-				/^\/%3F\/?$/
-			]
-		);
-	});
-
-	it('sorts routes correctly', () => {
-		const { pages, server_routes } = create_routes({
-			files: [
-				'index.html',
-				'about.html',
-				'post/f[xx].html',
-				'[wildcard].html',
-				'post/foo.html',
-				'post/[id].html',
-				'post/bar.html',
-				'post/[id].json.js',
-				'post/[id([0-9-a-z]{3,})].html',
-			]
-		});
-
-		assert.deepEqual(
-			pages.map(r => r.file),
-			[
-				'index.html',
-				'about.html',
-				'post/bar.html',
-				'post/foo.html',
-				'post/f[xx].html',
-				'post/[id([0-9-a-z]{3,})].html', // RegExp is more specific
-				'post/[id].html',
-				'[wildcard].html'
-			]
-		);
-
-		assert.deepEqual(
-			server_routes.map(r => r.file),
-			[
-				'post/[id].json.js'
-			]
-		);
-	});
-
-	it('distinguishes and sorts regexp routes correctly', () => {
-		const { pages } = create_routes({
-			files: [
-				'[slug].html',
-				'[slug([a-z]{2})].html',
-				'[slug([0-9-a-z]{3,})].html',
-			]
-		});
-
-		assert.deepEqual(
-			pages.map(r => r.file),
-			[
-				'[slug([0-9-a-z]{3,})].html',
-				'[slug([a-z]{2})].html',
-				'[slug].html',
-			]
-		);
-	});
-
-	it('prefers index page to nested route', () => {
-		let { pages, server_routes } = create_routes({
-			files: [
-				'api/examples/[slug].js',
-				'api/examples/index.js',
-				'blog/[slug].html',
-				'api/gists/[id].js',
-				'api/gists/index.js',
-				'_error.html',
-				'blog/index.html',
-				'blog/rss.xml.js',
-				'guide/index.html',
-				'index.html'
-			]
-		});
-
-		assert.deepEqual(
-			pages.map(r => r.file),
-			[
-				'_error.html',
-				'index.html',
-				'guide/index.html',
-				'blog/index.html',
-				'blog/[slug].html'
-			]
-		);
-
-		assert.deepEqual(
-			server_routes.map(r => r.file),
-			[
-				'blog/rss.xml.js',
-				'api/examples/index.js',
-				'api/examples/[slug].js',
-				'api/gists/index.js',
-				'api/gists/[id].js',
-			]
-		);
-
-		({ pages, server_routes } = create_routes({
-			files: [
-				'_error.html',
-				'api/blog/[slug].js',
-				'api/blog/index.js',
-				'api/guide/contents.js',
-				'api/guide/index.js',
-				'blog/[slug].html',
-				'blog/index.html',
-				'blog/rss.xml.js',
-				'gist/[id].js',
-				'gist/create.js',
-				'guide/index.html',
-				'index.html',
-				'repl/index.html'
-			]
-		}));
-
-		assert.deepEqual(
-			pages.map(r => r.file),
-			[
-				'_error.html',
-				'index.html',
-				'guide/index.html',
-				'blog/index.html',
-				'blog/[slug].html',
-				'repl/index.html'
-			]
-		);
-
-		assert.deepEqual(
-			server_routes.map(r => r.file),
-			[
-				'blog/rss.xml.js',
-				'gist/create.js',
-				'gist/[id].js',
-				'api/guide/index.js',
-				'api/guide/contents.js',
-				'api/blog/index.js',
-				'api/blog/[slug].js',
-			]
-		);
-
-		// RegExp routes
-		({ pages } = create_routes({
-			files: [
-				'blog/[slug].html',
-				'blog/index.html',
-				'blog/[slug([^0-9]+)].html',
-			]
-		}));
-
-		assert.deepEqual(
-			pages.map(r => r.file),
-			[
-				'blog/index.html',
-				'blog/[slug([^0-9]+)].html',
-				'blog/[slug].html',
-			]
-		);
-	});
-
-	it('generates params', () => {
-		const { pages } = create_routes({
-			files: ['index.html', 'about.html', '[wildcard].html', 'post/[id].html']
-		});
-
-		let file;
-		let params;
-		for (let i = 0; i < pages.length; i += 1) {
-			const route = pages[i];
-			if (params = route.exec('/post/123')) {
-				file = route.file;
-				break;
-			}
-		}
-
-		assert.equal(file, 'post/[id].html');
-		assert.deepEqual(params, {
-			id: '123'
-		});
-	});
-
-	it('ignores files and directories with leading underscores', () => {
-		const { pages } = create_routes({
-			files: ['index.html', '_foo.html', 'a/_b/c/d.html', 'e/f/g/h.html', 'i/_j.html']
-		});
-
-		assert.deepEqual(
-			pages.map(r => r.file),
-			[
-				'index.html',
-				'e/f/g/h.html'
-			]
-		);
-	});
-
-	it('ignores files and directories with leading dots except .well-known', () => {
-		const { server_routes } = create_routes({
-			files: ['.well-known/dnt-policy.txt.js', '.unknown/foo.txt.js']
-		});
-
-		assert.deepEqual(
-			server_routes.map(r => r.file),
-			['.well-known/dnt-policy.txt.js']
-		);
-	});
-
-	it('matches /foo/:bar before /:baz/qux', () => {
-		const a = create_routes({
-			files: ['foo/[bar].html', '[baz]/qux.html']
-		});
-		const b = create_routes({
-			files: ['[baz]/qux.html', 'foo/[bar].html']
-		});
-
-		assert.deepEqual(
-			a.pages.map(r => r.file),
-			['foo/[bar].html', '[baz]/qux.html']
-		);
-
-		assert.deepEqual(
-			b.pages.map(r => r.file),
-			['foo/[bar].html', '[baz]/qux.html']
-		);
-	});
-
-	it('fails if routes are indistinguishable', () => {
-		assert.throws(() => {
-			create_routes({
-				files: ['[foo].html', '[bar]/index.html']
-			});
-		}, /The \[foo\] and \[bar\]\/index routes clash/);
-
-		assert.throws(() => {
-			create_routes({
-				files: ['[foo([0-9-a-z]+)].html', '[bar([0-9-a-z]+)]/index.html']
-			});
-		}, /The \[foo\(\[0-9-a-z\]\+\)\] and \[bar\(\[0-9-a-z\]\+\)\]\/index routes clash/);
-	});
-
-
-	it('matches nested routes', () => {
-		const page = create_routes({
-			files: ['settings/[submenu].html']
-		}).pages[0];
-
-		assert.deepEqual(page.exec('/settings/foo'), {
-			submenu: 'foo'
-		});
-
-		assert.deepEqual(page.exec('/settings'), {
-			submenu: null
-		});
-	});
-
-	it('prefers index routes to nested routes', () => {
-		const { pages } = create_routes({
-			files: ['settings/[submenu].html', 'settings.html']
-		});
-
-		assert.deepEqual(
-			pages.map(r => r.file),
-			['settings.html', 'settings/[submenu].html']
-		);
-	});
-
-	it('matches deeply nested routes', () => {
-		const page = create_routes({
-			files: ['settings/[a]/[b]/index.html']
-		}).pages[0];
-
-		assert.deepEqual(page.exec('/settings/foo/bar'), {
-			a: 'foo',
-			b: 'bar'
-		});
-
-		assert.deepEqual(page.exec('/settings/foo'), {
-			a: 'foo',
-			b: null
-		});
-
-		assert.deepEqual(page.exec('/settings'), {
-			a: null,
-			b: null
-		});
-	});
-
-	it('matches a dynamic part within a part', () => {
-		const route = create_routes({
-			files: ['things/[slug].json.js']
-		}).server_routes[0];
-
-		assert.deepEqual(route.exec('/things/foo.json'), {
-			slug: 'foo'
-		});
-	});
-
-	it('matches multiple dynamic parts within a part', () => {
-		const route = create_routes({
-			files: ['things/[id]_[slug].json.js']
-		}).server_routes[0];
-
-		assert.deepEqual(route.exec('/things/someid_someslug.json'), {
-			id: 'someid',
-			slug: 'someslug'
-		});
-	});
-
-	it('fails if dynamic params are not separated', () => {
-		assert.throws(() => {
-			create_routes({
-				files: ['[foo][bar].js']
-			});
-		}, /Invalid route \[foo\]\[bar\]\.js — parameters must be separated/);
-	});
-
-	it('errors when trying to use reserved characters in route regexp', () => {
-		assert.throws(() => {
-			create_routes({
-				files: ['[lang([a-z]{2}(?:-[a-z]{2,4})?)]']
-			});
-		}, /Sapper does not allow \(, \), \? or \: in RegExp routes yet/);
-	});
-
-	it('errors on 4xx.html', () => {
-		assert.throws(() => {
-			create_routes({
-				files: ['4xx.html']
-			});
-		}, /As of Sapper 0.14, 4xx.html and 5xx.html should be replaced with _error.html/);
-	});
-
-	it('errors on 5xx.html', () => {
-		assert.throws(() => {
-			create_routes({
-				files: ['5xx.html']
-			});
-		}, /As of Sapper 0.14, 4xx.html and 5xx.html should be replaced with _error.html/);
-	});
-
-	it('treats foo/index.json.js the same as foo.json.js', () => {
-		const route = create_routes({
-			files: ['foo/index.json.js']
-		}).server_routes[0];
-
-		assert.ok(route.test('/foo.json'));
-	});
-});

test/unit/create_routes/index.js

@@ -0,0 +1,165 @@
+const path = require('path');
+const assert = require('assert');
+const { create_routes } = require('../../../dist/core.ts.js');
+
+
+const _default_layout = {
+	default: true,
+	name: '_default_layout',
+	file: null
+};
+
+describe('create_routes', () => {
+	it('creates routes', () => {
+		const { components, pages, server_routes } = create_routes(path.join(__dirname, 'samples/basic'));
+
+		const index = { name: 'index', file: 'index.html' };
+		const about = { name: 'about', file: 'about.html' };
+		const blog = { name: 'blog', file: 'blog/index.html' };
+		const blog_$slug = { name: 'blog_$slug', file: 'blog/[slug].html' };
+
+		assert.deepEqual(components, [
+			index,
+			about,
+			_default_layout,
+			blog,
+			blog_$slug
+		]);
+
+		assert.deepEqual(pages, [
+			{
+				pattern: /^\/?$/,
+				parts: [
+					{ component: index, params: [] }
+				]
+			},
+
+			{
+				pattern: /^\/about\/?$/,
+				parts: [
+					{ component: about, params: [] }
+				]
+			},
+
+			{
+				pattern: /^\/blog\/?$/,
+				parts: [
+					{ component: _default_layout, params: [] },
+					{ component: blog, params: [] }
+				]
+			},
+
+			{
+				pattern: /^\/blog\/([^\/]+?)\/?$/,
+				parts: [
+					{ component: _default_layout, params: [] },
+					{ component: blog_$slug, params: ['slug'] }
+				]
+			}
+		]);
+
+		assert.deepEqual(server_routes, [
+			{
+				name: 'route_blog_json',
+				pattern: /^\/blog.json\/?$/,
+				file: 'blog/index.json.js',
+				params: []
+			},
+
+			{
+				name: 'route_blog_$slug_json',
+				pattern: /^\/blog\/([^\/]+?).json\/?$/,
+				file: 'blog/[slug].json.js',
+				params: ['slug']
+			}
+		]);
+	});
+
+	it('encodes invalid characters', () => {
+		const { components, pages } = create_routes(path.join(__dirname, 'samples/encoding'));
+
+		// had to remove ? and " because windows
+
+		// const quote = { name: '$34', file: '".html' };
+		const hash = { name: '$35', file: '#.html' };
+		// const question_mark = { name: '$63', file: '?.html' };
+
+		assert.deepEqual(components, [
+			// quote,
+			hash,
+			// question_mark
+		]);
+
+		assert.deepEqual(pages.map(p => p.pattern), [
+			// /^\/%22\/?$/,
+			/^\/%23\/?$/,
+			// /^\/%3F\/?$/
+		]);
+	});
+
+	it('allows regex qualifiers', () => {
+		const { pages } = create_routes(path.join(__dirname, 'samples/qualifiers'));
+
+		assert.deepEqual(pages.map(p => p.pattern), [
+			/^\/([0-9-a-z]{3,})\/?$/,
+			/^\/([a-z]{2})\/?$/,
+			/^\/([^\/]+?)\/?$/
+		]);
+	});
+
+	it('sorts routes correctly', () => {
+		const { pages } = create_routes(path.join(__dirname, 'samples/sorting'));
+
+		assert.deepEqual(pages.map(p => p.parts.map(part => part.component.file)), [
+			['index.html'],
+			['about.html'],
+			[_default_layout.file, 'post/index.html'],
+			[_default_layout.file, 'post/bar.html'],
+			[_default_layout.file, 'post/foo.html'],
+			[_default_layout.file, 'post/f[xx].html'],
+			[_default_layout.file, 'post/[id([0-9-a-z]{3,})].html'],
+			[_default_layout.file, 'post/[id].html'],
+			['[wildcard].html']
+		]);
+	});
+
+	it('ignores files and directories with leading underscores', () => {
+		const { server_routes } = create_routes(path.join(__dirname, 'samples/hidden-underscore'));
+
+		assert.deepEqual(server_routes.map(r => r.file), [
+			'index.js',
+			'e/f/g/h.js'
+		]);
+	});
+
+	it('ignores files and directories with leading dots except .well-known', () => {
+		const { server_routes } = create_routes(path.join(__dirname, 'samples/hidden-dot'));
+
+		assert.deepEqual(server_routes.map(r => r.file), [
+			'.well-known/dnt-policy.txt.js'
+		]);
+	});
+
+	it('fails on clashes', () => {
+		assert.throws(() => {
+			const { pages } = create_routes(path.join(__dirname, 'samples/clash-pages'));
+		}, /The \[bar\]\/index\.html and \[foo\]\.html pages clash/);
+
+		assert.throws(() => {
+			const { server_routes } = create_routes(path.join(__dirname, 'samples/clash-routes'));
+			console.log(server_routes);
+		}, /The \[bar\]\/index\.js and \[foo\]\.js routes clash/);
+	});
+
+	it('fails if dynamic params are not separated', () => {
+		assert.throws(() => {
+			create_routes(path.join(__dirname, 'samples/invalid-params'));
+		}, /Invalid route \[foo\]\[bar\]\.js — parameters must be separated/);
+	});
+
+	it('errors when trying to use reserved characters in route regexp', () => {
+		assert.throws(() => {
+			create_routes(path.join(__dirname, 'samples/invalid-qualifier'));
+		}, /Invalid route \[foo\(\[a-z\]\(\[0-9\]\)\)\].js — cannot use \(, \), \? or \: in route qualifiers/);
+	});
+});

tsconfig.json

@@ -6,9 +6,9 @@
         "noEmitOnError": true,
         "allowJs": true,
         "lib": ["es5", "es6", "dom"],
-        "importHelpers": true
+        "importHelpers": true,
+        "target": "ES5"
     },
-    "target": "ES5",
     "include": [
         "src"
     ],