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frontend/node_modules/@sveltejs/kit/src/runtime/client/parse.js

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+import { exec, parse_route_id } from '../../utils/routing.js';
+
+/**
+ * @param {import('./types.js').SvelteKitApp} app
+ * @returns {import('types').CSRRoute[]}
+ */
+export function parse({ nodes, server_loads, dictionary, matchers }) {
+	const layouts_with_server_load = new Set(server_loads);
+
+	return Object.entries(dictionary).map(([id, [leaf, layouts, errors]]) => {
+		const { pattern, params } = parse_route_id(id);
+
+		/** @type {import('types').CSRRoute} */
+		const route = {
+			id,
+			/** @param {string} path */
+			exec: (path) => {
+				const match = pattern.exec(path);
+				if (match) return exec(match, params, matchers);
+			},
+			errors: [1, ...(errors || [])].map((n) => nodes[n]),
+			layouts: [0, ...(layouts || [])].map(create_layout_loader),
+			leaf: create_leaf_loader(leaf)
+		};
+
+		// bit of a hack, but ensures that layout/error node lists are the same
+		// length, without which the wrong data will be applied if the route
+		// manifest looks like `[[a, b], [c,], d]`
+		route.errors.length = route.layouts.length = Math.max(
+			route.errors.length,
+			route.layouts.length
+		);
+
+		return route;
+	});
+
+	/**
+	 * @param {number} id
+	 * @returns {[boolean, import('types').CSRPageNodeLoader]}
+	 */
+	function create_leaf_loader(id) {
+		// whether or not the route uses the server data is
+		// encoded using the ones' complement, to save space
+		const uses_server_data = id < 0;
+		if (uses_server_data) id = ~id;
+		return [uses_server_data, nodes[id]];
+	}
+
+	/**
+	 * @param {number | undefined} id
+	 * @returns {[boolean, import('types').CSRPageNodeLoader] | undefined}
+	 */
+	function create_layout_loader(id) {
+		// whether or not the layout uses the server data is
+		// encoded in the layouts array, to save space
+		return id === undefined ? id : [layouts_with_server_load.has(id), nodes[id]];
+	}
+}
+
+/**
+ * @param {import('types').CSRRouteServer} input
+ * @param {import('types').CSRPageNodeLoader[]} app_nodes Will be modified if a new node is loaded that's not already in the array
+ * @returns {import('types').CSRRoute}
+ */
+export function parse_server_route({ nodes, id, leaf, layouts, errors }, app_nodes) {
+	return {
+		id,
+		exec: () => ({}), // dummy function; exec already happened on the server
+		// By writing to app_nodes only when a loader at that index is not already defined,
+		// we ensure that loaders have referential equality when they load the same node.
+		// Code elsewhere in client.js relies on this referential equality to determine
+		// if a loader is different and should therefore (re-)run.
+		errors: errors.map((n) => (n ? (app_nodes[n] ||= nodes[n]) : undefined)),
+		layouts: layouts.map((n) => (n ? [n[0], (app_nodes[n[1]] ||= nodes[n[1]])] : undefined)),
+		leaf: [leaf[0], (app_nodes[leaf[1]] ||= nodes[leaf[1]])]
+	};
+}