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/** @import { SvelteNode } from '#compiler' */
/** @import { ClientTransformState, Context } from '../types.js' */
import * as b from '../../../../utils/builders.js';
import { extract_paths, is_expression_async } from '../../../../utils/ast.js';
import { is_ignored } from '../../../../state.js';
import { build_proxy_reassignment, should_proxy_or_freeze } from '../utils.js';
/**
* @param {AssignmentExpression} node
* @param {Context} context
*/
export function AssignmentExpression(node, context) {
const parent = /** @type {Node} */ (context.path.at(-1));
const is_standalone = parent.type.endsWith('Statement');
if (
node.left.type === 'ArrayPattern' ||
node.left.type === 'ObjectPattern' ||
node.left.type === 'RestElement'
) {
const value = /** @type {Expression} */ (context.visit(node.right));
const should_cache = value.type !== 'Identifier';
const rhs = should_cache ? b.id('$$value') : value;
let changed = false;
const assignments = extract_paths(node.left).map((path) => {
const value = path.expression?.(rhs);
let assignment = build_assignment('=', path.node, value, context);
if (assignment !== null) changed = true;
return assignment ?? /** @type {Expression} */ (context.next());
});
if (!changed) {
// No change to output -> nothing to transform -> we can keep the original assignment
return context.next();
}
const sequence = b.sequence(assignments);
if (!is_standalone) {
// this is part of an expression, we need the sequence to end with the value
sequence.expressions.push(rhs);
}
if (should_cache) {
// the right hand side is a complex expression, wrap in an IIFE to cache it
const iife = b.arrow([rhs], sequence);
const iife_is_async =
is_expression_async(value) ||
assignments.some((assignment) => is_expression_async(assignment));
return iife_is_async ? b.await(b.call(b.async(iife), value)) : b.call(iife, value);
}
return sequence;
}
if (node.left.type !== 'Identifier' && node.left.type !== 'MemberExpression') {
throw new Error(`Unexpected assignment type ${node.left.type}`);
}
return (
build_assignment(node.operator, node.left, node.right, context) ??
/** @type {Expression} */ (context.next())
);
}
/**
* @template {ClientTransformState} State
* @param {AssignmentOperator} operator
* @param {Pattern} left
* @param {Expression} right
* @param {import('zimmerframe').Context<SvelteNode, State>} context
* @returns {Expression | null}
*/
export function build_assignment(operator, left, right, context) {
// Handle class private/public state assignment cases
if (
context.state.analysis.runes &&
left.type === 'MemberExpression' &&
left.object.type === 'ThisExpression'
) {
if (left.property.type === 'PrivateIdentifier') {
const private_state = context.state.private_state.get(left.property.name);
if (private_state !== undefined) {
let value = get_assignment_value(operator, left, right, context);
let transformed = false;
if (should_proxy_or_freeze(value, context.state.scope)) {
transformed = true;
value =
private_state.kind === 'frozen_state'
? b.call('$.freeze', value)
: build_proxy_reassignment(value, private_state.id);
}
if (context.state.in_constructor) {
if (transformed) {
return b.assignment(operator, /** @type {Pattern} */ (context.visit(left)), value);
}
} else {
return b.call('$.set', left, value);
}
}
} else if (left.property.type === 'Identifier' && context.state.in_constructor) {
const public_state = context.state.public_state.get(left.property.name);
if (public_state !== undefined && should_proxy_or_freeze(right, context.state.scope)) {
const value = /** @type {Expression} */ (context.visit(right));
return b.assignment(
operator,
/** @type {Pattern} */ (context.visit(left)),
public_state.kind === 'frozen_state'
? b.call('$.freeze', value)
: build_proxy_reassignment(value, public_state.id)
);
}
}
}
let object = left;
while (object.type === 'MemberExpression') {
// @ts-expect-error
object = object.object;
}
if (object.type !== 'Identifier') {
return null;
}
const binding = context.state.scope.get(object.name);
if (!binding) return null;
const transform = Object.hasOwn(context.state.transform, object.name)
? context.state.transform[object.name]
: null;
// reassignment
if (object === left && transform?.assign) {
let value = get_assignment_value(operator, left, right, context);
// special case — if an element binding, we know it's a primitive
const path = context.path.map((node) => node.type);
const is_primitive = path.at(-1) === 'BindDirective' && path.at(-2) === 'RegularElement';
if (
!is_primitive &&
binding.kind !== 'prop' &&
context.state.analysis.runes &&
should_proxy_or_freeze(value, context.state.scope)
) {
value =
binding.kind === 'frozen_state'
? b.call('$.freeze', value)
: build_proxy_reassignment(value, object.name);
}
return transform.assign(object, value);
}
/** @type {Expression} */
let mutation = b.assignment(
operator,
/** @type {Pattern} */ (context.visit(left)),
/** @type {Expression} */ (context.visit(right))
);
// mutation
if (transform?.mutate) {
mutation = transform.mutate(object, mutation);
}
return is_ignored(left, 'ownership_invalid_mutation')
? b.call('$.skip_ownership_validation', b.thunk(mutation))
: mutation;
}
/**
* @template {ClientTransformState} State
* @param {AssignmentOperator} operator
* @param {Pattern} left
* @param {Expression} right
* @param {import('zimmerframe').Context<SvelteNode, State>} context
*/
function get_assignment_value(operator, left, right, { visit }) {
return operator === '='
? /** @type {Expression} */ (visit(right))
: // turn something like x += 1 into x = x + 1
b.binary(
/** @type {BinaryOperator} */ (operator.slice(0, -1)),
/** @type {Expression} */ (visit(left)),
/** @type {Expression} */ (visit(right))
);
}
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