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import { STATE_SYMBOL } from '../constants.js';
import { render_effect } from '../reactivity/effects.js';
import { current_component_context, untrack } from '../runtime.js';
import { get_prototype_of } 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;
}
export const ADD_OWNER = Symbol('ADD_OWNER');
/**
* 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
*/
export function mark_module_start() {
const start = get_stack()?.[2];
if (start) {
(boundaries[start.file] ??= []).push({
start,
// @ts-expect-error
end: null,
// @ts-expect-error we add the component at the end, since HMR will overwrite the function
component: null
});
}
}
/**
* @param {Function} component
*/
export function mark_module_end(component) {
const end = get_stack()?.[2];
if (end) {
const boundaries_file = boundaries[end.file];
const boundary = boundaries_file[boundaries_file.length - 1];
boundary.end = end;
boundary.component = component;
}
}
/**
* @param {any} object
* @param {any} owner
* @param {boolean} [global]
*/
export function add_owner(object, owner, global = false) {
if (object && !global) {
// @ts-expect-error
const component = current_component_context.function;
const metadata = object[STATE_SYMBOL];
if (metadata && !has_owner(metadata, component)) {
let original = get_owner(metadata);
if (owner.filename !== component.filename) {
let message = `${component.filename} passed a value to ${owner.filename} with \`bind:\`, but the value is owned by ${original.filename}. Consider creating a binding between ${original.filename} and ${component.filename}`;
// eslint-disable-next-line no-console
console.warn(message);
}
}
}
add_owner_to_object(object, owner, new Set());
}
/**
* @param {import('#client').ProxyMetadata | null} from
* @param {import('#client').ProxyMetadata} to
*/
export function widen_ownership(from, to) {
if (to.owners === null) {
return;
}
while (from) {
if (from.owners === null) {
to.owners = null;
break;
}
for (const owner of from.owners) {
to.owners.add(owner);
}
from = from.parent;
}
}
/**
* @param {any} object
* @param {Function} owner
* @param {Set<any>} seen
*/
function add_owner_to_object(object, owner, seen) {
const metadata = /** @type {import('#client').ProxyMetadata} */ (object?.[STATE_SYMBOL]);
if (metadata) {
// this is a state proxy, add owner directly, if not globally shared
if (metadata.owners !== null) {
metadata.owners.add(owner);
}
} else if (object && typeof object === 'object') {
if (seen.has(object)) return;
seen.add(object);
if (object[ADD_OWNER]) {
// this is a class with state fields. we put this in a render effect
// so that if state is replaced (e.g. `instance.name = { first, last }`)
// the new state is also co-owned by the caller of `getContext`
render_effect(() => {
object[ADD_OWNER](owner);
});
} else {
var proto = get_prototype_of(object);
if (proto === Object.prototype) {
// recurse until we find a state proxy
for (const key in object) {
add_owner_to_object(object[key], owner, seen);
}
} else if (proto === Array.prototype) {
// recurse until we find a state proxy
for (let i = 0; i < object.length; i += 1) {
add_owner_to_object(object[i], owner, seen);
}
}
}
}
}
/**
* @param {import('#client').ProxyMetadata} metadata
* @param {Function} component
* @returns {boolean}
*/
function has_owner(metadata, component) {
if (metadata.owners === null) {
return true;
}
return (
metadata.owners.has(component) ||
(metadata.parent !== null && has_owner(metadata.parent, component))
);
}
/**
* @param {import('#client').ProxyMetadata} metadata
* @returns {any}
*/
function get_owner(metadata) {
return (
metadata?.owners?.values().next().value ??
get_owner(/** @type {import('#client').ProxyMetadata} */ (metadata.parent))
);
}
/**
* @param {import('#client').ProxyMetadata} metadata
*/
export function check_ownership(metadata) {
const component = get_component();
if (component && !has_owner(metadata, component)) {
let original = get_owner(metadata);
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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