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/** @import { Visitors } from '../types' */
import is_reference from 'is-reference';
import { serialize_get_binding, serialize_set_binding } from '../utils.js';
import * as b from '../../../../utils/builders.js';
/** @type {Visitors} */
export const global_visitors = {
Identifier(node, { path, state }) {
if (is_reference(node, /** @type {Node} */ (path.at(-1)))) {
if (node.name === '$$props') {
return b.id('$$sanitized_props');
}
// Optimize prop access: If it's a member read access, we can use the $$props object directly
const binding = state.scope.get(node.name);
if (
state.analysis.runes && // can't do this in legacy mode because the proxy does more than just read/write
binding !== null &&
node !== binding.node &&
binding.kind === 'rest_prop'
) {
const parent = path.at(-1);
const grand_parent = path.at(-2);
if (
parent?.type === 'MemberExpression' &&
!parent.computed &&
grand_parent?.type !== 'AssignmentExpression' &&
grand_parent?.type !== 'UpdateExpression'
) {
return b.id('$$props');
}
}
return serialize_get_binding(node, state);
}
},
MemberExpression(node, { state, next }) {
// rewrite `this.#foo` as `this.#foo.v` inside a constructor
if (node.property.type === 'PrivateIdentifier') {
const field = state.private_state.get(node.property.name);
if (field) {
return state.in_constructor ? b.member(node, b.id('v')) : b.call('$.get', node);
}
} else if (node.object.type === 'ThisExpression') {
// rewrite `this.foo` as `this.#foo.v` inside a constructor
if (node.property.type === 'Identifier' && !node.computed) {
const field = state.public_state.get(node.property.name);
if (field && state.in_constructor) {
return b.member(b.member(b.this, field.id), b.id('v'));
}
}
}
next();
},
AssignmentExpression(node, context) {
return serialize_set_binding(node, context, context.next);
},
UpdateExpression(node, context) {
const { state, next, visit } = context;
const argument = node.argument;
if (argument.type === 'Identifier') {
const binding = state.scope.get(argument.name);
const is_store = binding?.kind === 'store_sub';
const name = is_store ? argument.name.slice(1) : argument.name;
// use runtime functions for smaller output
if (
binding?.kind === 'state' ||
binding?.kind === 'frozen_state' ||
binding?.kind === 'each' ||
binding?.kind === 'legacy_reactive' ||
binding?.kind === 'prop' ||
binding?.kind === 'bindable_prop' ||
is_store
) {
/** @type {Expression[]} */
const args = [];
let fn = '$.update';
if (node.prefix) fn += '_pre';
if (is_store) {
fn += '_store';
args.push(serialize_get_binding(b.id(name), state), b.call('$' + name));
} else {
if (binding.kind === 'prop' || binding.kind === 'bindable_prop') fn += '_prop';
args.push(b.id(name));
}
if (node.operator === '--') {
args.push(b.literal(-1));
}
return b.call(fn, ...args);
}
return next();
} else if (
argument.type === 'MemberExpression' &&
argument.object.type === 'ThisExpression' &&
argument.property.type === 'PrivateIdentifier' &&
context.state.private_state.has(argument.property.name)
) {
let fn = '$.update';
if (node.prefix) fn += '_pre';
/** @type {Expression[]} */
const args = [argument];
if (node.operator === '--') {
args.push(b.literal(-1));
}
return b.call(fn, ...args);
} else {
// turn it into an IIFEE assignment expression: i++ -> (() => { const $$value = i; i+=1; return $$value; })
const assignment = b.assignment(
node.operator === '++' ? '+=' : '-=',
/** @type {Pattern} */ (argument),
b.literal(1)
);
const serialized_assignment = serialize_set_binding(
assignment,
context,
() => assignment,
node.prefix
);
const value = /** @type {Expression} */ (visit(argument));
if (serialized_assignment === assignment) {
// No change to output -> nothing to transform -> we can keep the original update expression
return next();
} else if (context.state.analysis.runes) {
return serialized_assignment;
} else {
/** @type {Statement[]} */
let statements;
if (node.prefix) {
statements = [b.stmt(serialized_assignment), b.return(value)];
} else {
const tmp_id = state.scope.generate('$$value');
statements = [
b.const(tmp_id, value),
b.stmt(serialized_assignment),
b.return(b.id(tmp_id))
];
}
return b.call(b.thunk(b.block(statements)));
}
}
}
};
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