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import { is_hoistable_function, transform_inspect_rune } from '../../utils.js';
import * as b from '../../../../utils/builders.js';
import * as assert from '../../../../utils/assert.js';
import {
get_prop_source,
is_state_source,
serialize_proxy_reassignment,
should_proxy_or_freeze
} from '../utils.js';
import { extract_paths } from '../../../../utils/ast.js';
import { regex_invalid_identifier_chars } from '../../../patterns.js';
/** @type {import('../types.js').ComponentVisitors} */
export const javascript_visitors_runes = {
ClassBody(node, { state, visit }) {
/** @type {Map<string, import('../types.js').StateField>} */
const public_state = new Map();
/** @type {Map<string, import('../types.js').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, state.scope);
if (
rune === '$state' ||
rune === '$state.frozen' ||
rune === '$derived' ||
rune === '$derived.by'
) {
/** @type {import('../types.js').StateField} */
const field = {
kind:
rune === '$state'
? 'state'
: rune === '$state.frozen'
? 'frozen_state'
: rune === '$derived.by'
? 'derived_call'
: '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 = $state()` needs a backing `#foo` field
for (const [name, field] of public_state) {
let deconflicted = name;
while (private_ids.includes(deconflicted)) {
deconflicted = '_' + deconflicted;
}
private_ids.push(deconflicted);
field.id = b.private_id(deconflicted);
}
/** @type {Array<import('estree').MethodDefinition | import('estree').PropertyDefinition>} */
const body = [];
const child_state = { ...state, public_state, private_state };
// Replace parts of the class body
for (const definition of node.body) {
if (
definition.type === 'PropertyDefinition' &&
(definition.key.type === 'Identifier' ||
definition.key.type === 'PrivateIdentifier' ||
definition.key.type === 'Literal')
) {
const name = get_name(definition.key);
if (!name) continue;
const is_private = definition.key.type === 'PrivateIdentifier';
const field = (is_private ? private_state : public_state).get(name);
if (definition.value?.type === 'CallExpression' && field !== undefined) {
let value = null;
if (definition.value.arguments.length > 0) {
const init = /** @type {import('estree').Expression} **/ (
visit(definition.value.arguments[0], child_state)
);
value =
field.kind === 'state'
? b.call(
'$.source',
should_proxy_or_freeze(init, state.scope) ? b.call('$.proxy', init) : init
)
: field.kind === 'frozen_state'
? b.call(
'$.source',
should_proxy_or_freeze(init, state.scope) ? b.call('$.freeze', init) : init
)
: field.kind === 'derived_call'
? b.call('$.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('$.set', member, serialize_proxy_reassignment(value, field.id, state))
)
]
)
);
}
if (field.kind === 'frozen_state') {
// set foo(value) { this.#foo = value; }
const value = b.id('value');
body.push(
b.method(
'set',
definition.key,
[value],
[b.stmt(b.call('$.set', member, b.call('$.freeze', value)))]
)
);
}
if ((field.kind === 'derived' || field.kind === 'derived_call') && state.options.dev) {
body.push(
b.method(
'set',
definition.key,
[b.id('_')],
[b.throw_error(`Cannot update a derived property ('${name}')`)]
)
);
}
}
continue;
}
}
body.push(/** @type {import('estree').MethodDefinition} **/ (visit(definition, child_state)));
}
if (state.options.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')
)
)
),
true
)
);
}
return { ...node, body };
},
VariableDeclaration(node, { state, visit }) {
const declarations = [];
for (const declarator of node.declarations) {
const init = declarator.init;
const rune = get_rune(init, state.scope);
if (
!rune ||
rune === '$effect.active' ||
rune === '$effect.root' ||
rune === '$inspect' ||
rune === '$state.snapshot' ||
rune === '$state.is'
) {
if (init != null && is_hoistable_function(init)) {
const hoistable_function = visit(init);
state.hoisted.push(
b.declaration(
'const',
declarator.id,
/** @type {import('estree').Expression} */ (hoistable_function)
)
);
continue;
}
declarations.push(/** @type {import('estree').VariableDeclarator} */ (visit(declarator)));
continue;
}
if (rune === '$props') {
assert.equal(declarator.id.type, 'ObjectPattern');
/** @type {string[]} */
const seen = [];
for (const property of declarator.id.properties) {
if (property.type === 'Property') {
const key = /** @type {import('estree').Identifier | import('estree').Literal} */ (
property.key
);
const name = key.type === 'Identifier' ? key.name : /** @type {string} */ (key.value);
seen.push(name);
let id =
property.value.type === 'AssignmentPattern' ? property.value.left : property.value;
assert.equal(id.type, 'Identifier');
const binding = /** @type {import('#compiler').Binding} */ (state.scope.get(id.name));
let initial =
binding.initial &&
/** @type {import('estree').Expression} */ (visit(binding.initial));
// We're adding proxy here on demand and not within the prop runtime function so that
// people not using proxied state anywhere in their code don't have to pay the additional bundle size cost
if (initial && binding.mutated && should_proxy_or_freeze(initial, state.scope)) {
initial = b.call('$.proxy', initial);
}
if (binding.reassigned || state.analysis.accessors || initial) {
declarations.push(b.declarator(id, get_prop_source(binding, state, name, initial)));
}
} else {
// RestElement
/** @type {import('estree').Expression[]} */
const args = [b.id('$$props'), b.array(seen.map((name) => b.literal(name)))];
if (state.options.dev) {
// include rest name, so we can provide informative error messages
args.push(
b.literal(/** @type {import('estree').Identifier} */ (property.argument).name)
);
}
declarations.push(b.declarator(property.argument, b.call('$.rest_props', ...args)));
}
}
// TODO
continue;
}
const args = /** @type {import('estree').CallExpression} */ (init).arguments;
const value =
args.length === 0
? b.id('undefined')
: /** @type {import('estree').Expression} */ (visit(args[0]));
if (rune === '$state' || rune === '$state.frozen') {
/**
* @param {import('estree').Identifier} id
* @param {import('estree').Expression} value
*/
const create_state_declarator = (id, value) => {
const binding = /** @type {import('#compiler').Binding} */ (state.scope.get(id.name));
if (should_proxy_or_freeze(value, state.scope)) {
value = b.call(rune === '$state' ? '$.proxy' : '$.freeze', value);
}
if (is_state_source(binding, state)) {
value = b.call('$.source', value);
}
return value;
};
if (declarator.id.type === 'Identifier') {
declarations.push(
b.declarator(declarator.id, create_state_declarator(declarator.id, value))
);
} else {
const tmp = state.scope.generate('tmp');
const paths = extract_paths(declarator.id);
declarations.push(
b.declarator(b.id(tmp), value),
...paths.map((path) => {
const value = path.expression?.(b.id(tmp));
const binding = state.scope.get(
/** @type {import('estree').Identifier} */ (path.node).name
);
return b.declarator(
path.node,
binding?.kind === 'state' || binding?.kind === 'frozen_state'
? create_state_declarator(binding.node, value)
: value
);
})
);
}
continue;
}
if (rune === '$derived' || rune === '$derived.by') {
if (declarator.id.type === 'Identifier') {
declarations.push(
b.declarator(
declarator.id,
b.call('$.derived', rune === '$derived.by' ? value : b.thunk(value))
)
);
} else {
const bindings = state.scope.get_bindings(declarator);
const object_id = state.scope.generate('derived_object');
const values_id = state.scope.generate('derived_values');
declarations.push(
b.declarator(
b.id(object_id),
b.call('$.derived', rune === '$derived.by' ? value : b.thunk(value))
)
);
declarations.push(
b.declarator(
b.id(values_id),
b.call(
'$.derived',
b.thunk(
b.block([
b.let(declarator.id, b.call('$.get', b.id(object_id))),
b.return(b.array(bindings.map((binding) => binding.node)))
])
)
)
)
);
for (let i = 0; i < bindings.length; i++) {
const binding = bindings[i];
declarations.push(
b.declarator(
binding.node,
b.call(
'$.derived',
b.thunk(b.member(b.call('$.get', b.id(values_id)), b.literal(i), true))
)
)
);
}
}
continue;
}
}
if (declarations.length === 0) {
return b.empty;
}
return {
...node,
declarations
};
},
ExpressionStatement(node, context) {
if (node.expression.type === 'CallExpression') {
const callee = node.expression.callee;
if (
callee.type === 'Identifier' &&
callee.name === '$effect' &&
!context.state.scope.get('$effect')
) {
const func = context.visit(node.expression.arguments[0]);
return {
...node,
expression: b.call('$.user_effect', /** @type {import('estree').Expression} */ (func))
};
}
if (
callee.type === 'MemberExpression' &&
callee.object.type === 'Identifier' &&
callee.object.name === '$effect' &&
callee.property.type === 'Identifier' &&
callee.property.name === 'pre' &&
!context.state.scope.get('$effect')
) {
const func = context.visit(node.expression.arguments[0]);
return {
...node,
expression: b.call('$.user_pre_effect', /** @type {import('estree').Expression} */ (func))
};
}
}
context.next();
},
CallExpression(node, context) {
const rune = get_rune(node, context.state.scope);
if (rune === '$host') {
return b.id('$$props.$$host');
}
if (rune === '$effect.active') {
return b.call('$.effect_active');
}
if (rune === '$state.snapshot') {
return b.call(
'$.snapshot',
/** @type {import('estree').Expression} */ (context.visit(node.arguments[0]))
);
}
if (rune === '$state.is') {
return b.call(
'$.is',
/** @type {import('estree').Expression} */ (context.visit(node.arguments[0])),
/** @type {import('estree').Expression} */ (context.visit(node.arguments[1]))
);
}
if (rune === '$effect.root') {
const args = /** @type {import('estree').Expression[]} */ (
node.arguments.map((arg) => context.visit(arg))
);
return b.call('$.effect_root', ...args);
}
if (rune === '$inspect' || rune === '$inspect().with') {
return transform_inspect_rune(node, context);
}
context.next();
},
BinaryExpression(node, { state, visit, next }) {
const operator = node.operator;
if (state.options.dev) {
if (operator === '===' || operator === '!==') {
return b.call(
'$.strict_equals',
/** @type {import('estree').Expression} */ (visit(node.left)),
/** @type {import('estree').Expression} */ (visit(node.right)),
operator === '!==' && b.literal(false)
);
}
if (operator === '==' || operator === '!=') {
return b.call(
'$.equals',
/** @type {import('estree').Expression} */ (visit(node.left)),
/** @type {import('estree').Expression} */ (visit(node.right)),
operator === '!=' && b.literal(false)
);
}
}
next();
}
};
/**
* @param {import('estree').Identifier | import('estree').PrivateIdentifier | import('estree').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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