Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 | 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 44x 3x 3x 3x 41x 41x 41x 41x 41x 41x 41x 41x 41x 41x 41x 110x 110x 60x 110x 59x 59x 59x 59x 59x 59x 53x 53x 13x 13x 13x 13x 13x 13x 13x 13x 1x 13x 12x 12x 13x 53x 59x 110x 41x 41x 41x 12x 12x 12x 12x 12x 12x 41x 41x 41x 41x 41x 41x 41x 41x 110x 110x 60x 110x 59x 59x 59x 59x 59x 59x 13x 13x 13x 13x 13x 13x 13x 1x 13x 12x 12x 12x 12x 12x 12x 12x 12x 12x 13x 13x 13x 59x 97x 97x 97x 41x 41x 41x | /** @import { ClassBody, Expression, MethodDefinition, PropertyDefinition } from 'estree' */
/** @import { Context } from '../types.js' */
/** @import { StateField } from '../../client/types.js' */
import { dev } from '../../../../state.js';
import * as b from '../../../../utils/builders.js';
import { get_rune } from '../../../scope.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_derived = new Map();
/** @type {Map<string, StateField>} */
const private_derived = 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')
) {
const { type, name } = definition.key;
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 === '$derived' || rune === '$derived.by') {
/** @type {StateField} */
const field = {
kind: 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_derived.set(name, field);
} else {
public_derived.set(name, field);
}
}
}
}
}
// each `foo = $derived()` needs a backing `#foo` field
for (const [name, field] of public_derived) {
let deconflicted = name;
while (private_ids.includes(deconflicted)) {
deconflicted = '_' + deconflicted;
}
private_ids.push(deconflicted);
field.id = b.private_id(deconflicted);
}
/** @type {Array<MethodDefinition | PropertyDefinition>} */
const body = [];
const child_state = { ...context.state, private_derived };
// Replace parts of the class body
for (const definition of node.body) {
if (
definition.type === 'PropertyDefinition' &&
(definition.key.type === 'Identifier' || definition.key.type === 'PrivateIdentifier')
) {
const name = definition.key.name;
const is_private = definition.key.type === 'PrivateIdentifier';
const field = (is_private ? private_derived : public_derived).get(name);
if (definition.value?.type === 'CallExpression' && field !== undefined) {
const init = /** @type {Expression} **/ (
context.visit(definition.value.arguments[0], child_state)
);
const value =
field.kind === 'derived_by' ? b.call('$.once', init) : b.call('$.once', b.thunk(init));
if (is_private) {
body.push(b.prop_def(field.id, value));
} else {
// #foo;
const member = b.member(b.this, field.id);
body.push(b.prop_def(field.id, value));
// get foo() { return this.#foo; }
body.push(b.method('get', definition.key, [], [b.return(b.call(member))]));
if (dev && (field.kind === 'derived' || field.kind === 'derived_by')) {
body.push(
b.method(
'set',
definition.key,
[b.id('_')],
[b.throw_error(`Cannot update a derived property ('${name}')`)]
)
);
}
}
continue;
}
}
body.push(/** @type {MethodDefinition} **/ (context.visit(definition, child_state)));
}
return { ...node, body };
}
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