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import { STATE_SYMBOL } from '../constants.js';
import { untrack } from '../runtime.js';
import { get_descriptors } from '../utils.js';
/** @type {Record<string, Array<{ start: Location, end: Location, component: Function }>>} */
const boundaries = {};
const chrome_pattern = /at (?:.+ \()?(.+):(\d+):(\d+)\)?$/;
const firefox_pattern = /@(.+):(\d+):(\d+)$/;
function get_stack() {
const stack = new Error().stack;
if (!stack) return null;
const entries = [];
for (const line of stack.split('\n')) {
let match = chrome_pattern.exec(line) ?? firefox_pattern.exec(line);
if (match) {
entries.push({
file: match[1],
line: +match[2],
column: +match[3]
});
}
}
return entries;
}
/**
* Determines which `.svelte` component is responsible for a given state change
* @returns {Function | null}
*/
function get_component() {
// first 4 lines are svelte internals; adjust this number if we change the internal call stack
const stack = get_stack()?.slice(4);
if (!stack) return null;
for (let i = 0; i < stack.length; i++) {
const entry = stack[i];
const modules = boundaries[entry.file];
if (!modules) {
// If the first entry is not a component, that means the modification very likely happened
// within a .svelte.js file, possibly triggered by a component. Since these files are not part
// of the bondaries/component context heuristic, we need to bail in this case, else we would
// have false positives when the .svelte.ts file provides a state creator function, encapsulating
// the state and its mutations, and is being called from a component other than the one who
// called the state creator function.
if (i === 0) return null;
continue;
}
for (const module of modules) {
if (module.start.line < entry.line && module.end.line > entry.line) {
return module.component;
}
}
}
return null;
}
/**
* Together with `mark_module_end`, this function establishes the boundaries of a `.svelte` file,
* such that subsequent calls to `get_component` can tell us which component is responsible
* for a given state change
* @param {Function} component
*/
export function mark_module_start(component) {
const start = get_stack()?.[2];
if (start) {
(boundaries[start.file] ??= []).push({
start,
// @ts-expect-error
end: null,
component
});
}
}
export function mark_module_end() {
const end = get_stack()?.[2];
if (end) {
const boundaries_file = boundaries[end.file];
boundaries_file[boundaries_file.length - 1].end = end;
}
}
let add_owner_visited = new Set();
/**
*
* @param {any} object
* @param {any} owner
*/
export function add_owner(object, owner) {
// Needed because ownership addition can invoke getters on a proxy,
// calling add_owner anew, so just keeping the set as part of
// add_owner_to_object would not be enough.
const prev = add_owner_visited;
try {
add_owner_visited = new Set(add_owner_visited);
untrack(() => {
add_owner_to_object(object, owner, add_owner_visited);
});
} finally {
add_owner_visited = prev;
}
}
/**
* @param {any} object
* @param {Function} owner
* @param {Set<any>} visited
*/
function add_owner_to_object(object, owner, visited) {
if (visited.has(object)) return;
visited.add(object);
if (object?.[STATE_SYMBOL]?.o && !object[STATE_SYMBOL].o.has(owner)) {
object[STATE_SYMBOL].o.add(owner);
}
// Not inside previous if-block; there could be normal objects in-between
traverse_for_owners(object, (nested) => add_owner_to_object(nested, owner, visited));
}
let strip_owner_visited = new Set();
/**
* @param {any} object
*/
export function strip_owner(object) {
// Needed because ownership stripping can invoke getters on a proxy,
// calling strip_owner anew, so just keeping the set as part of
// strip_owner_from_object would not be enough.
const prev = strip_owner_visited;
try {
untrack(() => {
strip_owner_from_object(object, strip_owner_visited);
});
} finally {
strip_owner_visited = prev;
}
}
/**
* @param {any} object
* @param {Set<any>} visited
*/
function strip_owner_from_object(object, visited) {
if (visited.has(object)) return;
visited.add(object);
if (object?.[STATE_SYMBOL]?.o) {
object[STATE_SYMBOL].o = null;
}
// Not inside previous if-block; there could be normal objects in-between
traverse_for_owners(object, (nested) => strip_owner_from_object(nested, visited));
}
/**
* @param {any} object
* @param {(obj: any) => void} cb
*/
function traverse_for_owners(object, cb) {
if (typeof object === 'object' && object !== null && !(object instanceof EventTarget)) {
for (const key in object) {
cb(object[key]);
}
// deal with state on classes
const proto = Object.getPrototypeOf(object);
if (
proto !== Object.prototype &&
proto !== Array.prototype &&
proto !== Map.prototype &&
proto !== Set.prototype &&
proto !== Date.prototype
) {
const descriptors = get_descriptors(proto);
for (let key in descriptors) {
const get = descriptors[key].get;
if (get) {
try {
cb(object[key]);
} catch (e) {
// continue
}
}
}
}
}
}
/**
* @param {Set<Function>} owners
*/
export function check_ownership(owners) {
const component = get_component();
if (component && !owners.has(component)) {
let original = [...owners][0];
let message =
// @ts-expect-error
original.filename !== component.filename
? // @ts-expect-error
`${component.filename} mutated a value owned by ${original.filename}. This is strongly discouraged`
: 'Mutating a value outside the component that created it is strongly discouraged';
// eslint-disable-next-line no-console
console.warn(
`${message}. Consider passing values to child components with \`bind:\`, or use a callback instead.`
);
// eslint-disable-next-line no-console
console.trace();
}
}
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