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@ -1,12 +1,7 @@
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/** @import { ArrowFunctionExpression, Expression, FunctionDeclaration, FunctionExpression } from 'estree' */
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/** @import { AST, DelegatedEvent } from '#compiler' */
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/** @import { AST } from '#compiler' */
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/** @import { Context } from '../types' */
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import { cannot_be_set_statically, is_capture_event, is_delegated } from '../../../../utils.js';
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import {
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get_attribute_chunks,
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get_attribute_expression,
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is_event_attribute
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} from '../../../utils/ast.js';
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import { cannot_be_set_statically, can_delegate_event } from '../../../../utils.js';
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import { get_attribute_chunks, is_event_attribute } from '../../../utils/ast.js';
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import { mark_subtree_dynamic } from './shared/fragment.js';
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/**
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@ -64,181 +59,8 @@ export function Attribute(node, context) {
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context.state.analysis.uses_event_attributes = true;
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}
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const expression = get_attribute_expression(node);
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const delegated_event = get_delegated_event(node.name.slice(2), expression, context);
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if (delegated_event !== null) {
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if (delegated_event.hoisted) {
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delegated_event.function.metadata.hoisted = true;
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}
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node.metadata.delegated = delegated_event;
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}
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}
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}
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}
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/** @type {DelegatedEvent} */
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const unhoisted = { hoisted: false };
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/**
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* Checks if given event attribute can be delegated/hoisted and returns the corresponding info if so
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* @param {string} event_name
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* @param {Expression | null} handler
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* @param {Context} context
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* @returns {null | DelegatedEvent}
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*/
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function get_delegated_event(event_name, handler, context) {
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// Handle delegated event handlers. Bail out if not a delegated event.
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if (!handler || !is_delegated(event_name)) {
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return null;
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}
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// If we are not working with a RegularElement, then bail out.
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const element = context.path.at(-1);
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if (element?.type !== 'RegularElement') {
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return null;
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}
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/** @type {FunctionExpression | FunctionDeclaration | ArrowFunctionExpression | null} */
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let target_function = null;
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let binding = null;
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if (element.metadata.has_spread) {
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// event attribute becomes part of the dynamic spread array
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return unhoisted;
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}
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if (handler.type === 'ArrowFunctionExpression' || handler.type === 'FunctionExpression') {
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target_function = handler;
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} else if (handler.type === 'Identifier') {
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binding = context.state.scope.get(handler.name);
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if (context.state.analysis.module.scope.references.has(handler.name)) {
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// If a binding with the same name is referenced in the module scope (even if not declared there), bail out
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return unhoisted;
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}
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if (binding != null) {
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for (const { path } of binding.references) {
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const parent = path.at(-1);
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if (parent === undefined) return unhoisted;
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const grandparent = path.at(-2);
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/** @type {AST.RegularElement | null} */
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let element = null;
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/** @type {string | null} */
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let event_name = null;
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if (parent.type === 'OnDirective') {
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element = /** @type {AST.RegularElement} */ (grandparent);
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event_name = parent.name;
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} else if (
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parent.type === 'ExpressionTag' &&
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grandparent?.type === 'Attribute' &&
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is_event_attribute(grandparent)
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) {
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element = /** @type {AST.RegularElement} */ (path.at(-3));
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const attribute = /** @type {AST.Attribute} */ (grandparent);
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event_name = get_attribute_event_name(attribute.name);
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}
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if (element && event_name) {
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if (
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element.type !== 'RegularElement' ||
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element.metadata.has_spread ||
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!is_delegated(event_name)
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) {
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return unhoisted;
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}
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} else if (parent.type !== 'FunctionDeclaration' && parent.type !== 'VariableDeclarator') {
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return unhoisted;
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}
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}
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node.metadata.delegated =
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parent?.type === 'RegularElement' && can_delegate_event(node.name.slice(2));
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}
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// If the binding is exported, bail out
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if (context.state.analysis.exports.find((node) => node.name === handler.name)) {
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return unhoisted;
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}
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if (binding?.is_function()) {
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target_function = binding.initial;
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}
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}
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// If we can't find a function, or the function has multiple parameters, bail out
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if (target_function == null || target_function.params.length > 1) {
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return unhoisted;
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}
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const visited_references = new Set();
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const scope = target_function.metadata.scope;
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for (const [reference] of scope.references) {
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// Bail out if the arguments keyword is used or $host is referenced
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if (reference === 'arguments' || reference === '$host') return unhoisted;
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// Bail out if references a store subscription
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if (scope.get(`$${reference}`)?.kind === 'store_sub') return unhoisted;
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const binding = scope.get(reference);
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const local_binding = context.state.scope.get(reference);
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// if the function access a snippet that can't be hoisted we bail out
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if (
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local_binding !== null &&
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local_binding.initial?.type === 'SnippetBlock' &&
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!local_binding.initial.metadata.can_hoist
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) {
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return unhoisted;
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}
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// If we are referencing a binding that is shadowed in another scope then bail out (unless it's declared within the function).
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if (
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local_binding !== null &&
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binding !== null &&
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local_binding.node !== binding.node &&
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scope.declarations.get(reference) !== binding
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) {
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return unhoisted;
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}
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// If we have multiple references to the same store using $ prefix, bail out.
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if (
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binding !== null &&
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binding.kind === 'store_sub' &&
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visited_references.has(reference.slice(1))
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) {
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return unhoisted;
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}
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// If we reference the index within an each block, then bail out.
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if (binding !== null && binding.initial?.type === 'EachBlock') return unhoisted;
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if (
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binding !== null &&
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// Bail out if the binding is a rest param
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(binding.declaration_kind === 'rest_param' ||
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// Bail out if we reference anything from the EachBlock (for now) that mutates in non-runes mode,
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(((!context.state.analysis.runes && binding.kind === 'each') ||
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// or any normal not reactive bindings that are mutated.
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binding.kind === 'normal') &&
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binding.updated))
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) {
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return unhoisted;
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}
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visited_references.add(reference);
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}
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return { hoisted: true, function: target_function };
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}
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/**
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* @param {string} event_name
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*/
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function get_attribute_event_name(event_name) {
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event_name = event_name.slice(2);
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if (is_capture_event(event_name)) {
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event_name = event_name.slice(0, -7);
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}
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return event_name;
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}
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Rich Harris
4 weeks ago
committed by
GitHub