Press n or j to go to the next uncovered block, b, p or k for the previous block.
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/** @import { Location } from 'locate-character' */
/** @import { Context } from '../types.js' */
import * as b from '../../../../utils/builders.js';
import { build_assignment_value } from '../../../../utils/ast.js';
import { dev, filename, is_ignored, locator } from '../../../../state.js';
import { build_proxy_reassignment, should_proxy } from '../utils.js';
import { visit_assignment_expression } from '../../shared/assignments.js';
/**
* @param {AssignmentExpression} node
* @param {Context} context
*/
export function AssignmentExpression(node, context) {
let expression = /** @type {Expression} */ (
visit_assignment_expression(node, context, build_assignment) ?? context.next()
);
const loc =
dev &&
node.left.type === 'MemberExpression' &&
node.left.start !== undefined &&
locator(node.left.start);
if (loc) {
expression = b.sequence([
b.call('$.track_assignment', b.literal(`${filename}:${loc.line}:${loc.column}`)),
expression
]);
}
return is_ignored(node, 'ownership_invalid_mutation')
? b.call('$.skip_ownership_validation', b.thunk(expression))
: expression;
}
/**
* @param {AssignmentOperator} operator
* @param {Pattern} left
* @param {Expression} right
* @param {Context} context
* @returns {Expression | null}
*/
function build_assignment(operator, left, right, context) {
// Handle class private/public state assignment cases
if (
context.state.analysis.runes &&
left.type === 'MemberExpression' &&
left.object.type === 'ThisExpression'
) {
if (left.property.type === 'PrivateIdentifier') {
const private_state = context.state.private_state.get(left.property.name);
if (private_state !== undefined) {
let transformed = false;
let value = /** @type {Expression} */ (
context.visit(build_assignment_value(operator, left, right))
);
if (should_proxy(value, context.state.scope)) {
transformed = true;
value =
private_state.kind === 'raw_state'
? value
: build_proxy_reassignment(value, b.member(b.this, private_state.id));
}
if (!context.state.in_constructor) {
return b.call('$.set', left, value);
} else if (transformed) {
return b.assignment(operator, /** @type {Pattern} */ (context.visit(left)), value);
}
}
}
}
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 = /** @type {Expression} */ (
context.visit(build_assignment_value(operator, left, right))
);
// 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' &&
binding.kind !== 'bindable_prop' &&
context.state.analysis.runes &&
should_proxy(value, context.state.scope)
) {
value = binding.kind === 'raw_state' ? value : build_proxy_reassignment(value, object);
}
return transform.assign(object, value);
}
// mutation
if (transform?.mutate) {
return transform.mutate(
object,
b.assignment(
operator,
/** @type {Pattern} */ (context.visit(left)),
/** @type {Expression} */ (context.visit(right))
)
);
}
return null;
}
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