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/** @import { } from '#compiler' */
/** @import { Context, StateField } from '../types' */
import { dev, is_ignored } from '../../../../state.js';
import * as b from '../../../../utils/builders.js';
import { regex_invalid_identifier_chars } from '../../../patterns.js';
import { get_rune } from '../../../scope.js';
import { build_proxy_reassignment, should_proxy_or_freeze } from '../utils.js';
/**
* @param {ClassBody} node
* @param {Context} context
*/
export function ClassBody(node, context) {
if (!context.state.analysis.runes) {
context.next();
return;
}
/** @type {Map<string, StateField>} */
const public_state = new Map();
/** @type {Map<string, StateField>} */
const private_state = new Map();
/** @type {string[]} */
const private_ids = [];
for (const definition of node.body) {
if (
definition.type === 'PropertyDefinition' &&
(definition.key.type === 'Identifier' ||
definition.key.type === 'PrivateIdentifier' ||
definition.key.type === 'Literal')
) {
const type = definition.key.type;
const name = get_name(definition.key);
if (!name) continue;
const is_private = type === 'PrivateIdentifier';
if (is_private) private_ids.push(name);
if (definition.value?.type === 'CallExpression') {
const rune = get_rune(definition.value, context.state.scope);
if (
rune === '$state' ||
rune === '$state.frozen' ||
rune === '$derived' ||
rune === '$derived.by'
) {
/** @type {StateField} */
const field = {
kind:
rune === '$state'
? 'state'
: rune === '$state.frozen'
? 'frozen_state'
: rune === '$derived.by'
? 'derived_by'
: 'derived',
// @ts-expect-error this is set in the next pass
id: is_private ? definition.key : null
};
if (is_private) {
private_state.set(name, field);
} else {
public_state.set(name, field);
}
}
}
}
}
// each `foo = $state()` needs a backing `#foo` field
for (const [name, field] of public_state) {
let deconflicted = name;
while (private_ids.includes(deconflicted)) {
deconflicted = '_' + deconflicted;
}
private_ids.push(deconflicted);
field.id = b.private_id(deconflicted);
}
/** @type {Array<MethodDefinition | PropertyDefinition>} */
const body = [];
const child_state = { ...context.state, public_state, private_state };
// Replace parts of the class body
for (const definition of node.body) {
if (
definition.type === 'PropertyDefinition' &&
(definition.key.type === 'Identifier' ||
definition.key.type === 'PrivateIdentifier' ||
definition.key.type === 'Literal')
) {
const name = get_name(definition.key);
if (!name) continue;
const is_private = definition.key.type === 'PrivateIdentifier';
const field = (is_private ? private_state : public_state).get(name);
if (definition.value?.type === 'CallExpression' && field !== undefined) {
let value = null;
if (definition.value.arguments.length > 0) {
const init = /** @type {Expression} **/ (
context.visit(definition.value.arguments[0], child_state)
);
value =
field.kind === 'state'
? b.call(
'$.source',
should_proxy_or_freeze(init, context.state.scope) ? b.call('$.proxy', init) : init
)
: field.kind === 'frozen_state'
? b.call(
'$.source',
should_proxy_or_freeze(init, context.state.scope)
? b.call('$.freeze', init)
: init
)
: field.kind === 'derived_by'
? b.call('$.derived', init)
: b.call('$.derived', b.thunk(init));
} else {
// if no arguments, we know it's state as `$derived()` is a compile error
value = b.call('$.source');
}
if (is_private) {
body.push(b.prop_def(field.id, value));
} else {
// #foo;
const member = b.member(b.this, field.id);
body.push(b.prop_def(field.id, value));
// get foo() { return this.#foo; }
body.push(b.method('get', definition.key, [], [b.return(b.call('$.get', member))]));
if (field.kind === 'state') {
// set foo(value) { this.#foo = value; }
const value = b.id('value');
body.push(
b.method(
'set',
definition.key,
[value],
[b.stmt(b.call('$.set', member, build_proxy_reassignment(value, field.id)))]
)
);
}
if (field.kind === 'frozen_state') {
// set foo(value) { this.#foo = value; }
const value = b.id('value');
body.push(
b.method(
'set',
definition.key,
[value],
[b.stmt(b.call('$.set', member, b.call('$.freeze', value)))]
)
);
}
if (dev && (field.kind === 'derived' || field.kind === 'derived_by')) {
body.push(
b.method(
'set',
definition.key,
[b.id('_')],
[b.throw_error(`Cannot update a derived property ('${name}')`)]
)
);
}
}
continue;
}
}
body.push(/** @type {MethodDefinition} **/ (context.visit(definition, child_state)));
}
if (dev && public_state.size > 0) {
// add an `[$.ADD_OWNER]` method so that a class with state fields can widen ownership
body.push(
b.method(
'method',
b.id('$.ADD_OWNER'),
[b.id('owner')],
Array.from(public_state.keys()).map((name) =>
b.stmt(
b.call(
'$.add_owner',
b.call('$.get', b.member(b.this, b.private_id(name))),
b.id('owner'),
b.literal(false),
is_ignored(node, 'ownership_invalid_binding') && b.true
)
)
),
true
)
);
}
return { ...node, body };
}
/**
* @param {Identifier | PrivateIdentifier | Literal} node
*/
function get_name(node) {
if (node.type === 'Literal') {
return node.value?.toString().replace(regex_invalid_identifier_chars, '_');
} else {
return node.name;
}
}
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