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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 | 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 5878x 5878x 5878x 5878x 365x 365x 122x 122x 365x 5876x 5876x 5788x 5907x 2327x 2327x 2327x 2327x 5907x 531x 531x 1796x 1796x 1796x 1796x 5788x 5788x 713x 713x 651x 651x 713x 713x 713x 713x 713x 632x 470x 470x 632x 632x 632x 713x 5788x 5878x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 713x 713x 713x 29x 29x 684x 684x 684x 713x 52x 52x 632x 632x 632x 632x 632x 713x 10x 10x 10x 622x 713x 443x 713x 141x 141x 141x 8x 8x 8x 133x 133x 133x 255x 255x 255x 255x 255x 255x 255x 255x 255x 255x 255x 255x 255x 118x 255x 118x 118x 118x 118x 255x 255x 118x 118x 118x 118x 118x 2x 2x 255x 21x 21x 255x 110x 110x 110x 141x 110x 141x 106x 106x 106x 106x 106x 8x 106x 98x 98x 106x 141x 591x 591x 713x 50x 50x 541x 541x 541x 684x 841x 841x 841x 841x 833x 833x 833x 833x 833x 841x 2x 2x 831x 831x 831x 841x 841x 22x 841x 831x 831x 841x 825x 825x 841x 724x 724x 724x 724x 724x 724x 724x 841x 55x 55x 770x 770x 470x 470x 470x 2x 2x 2x 2x 118x 118x 118x 118x 118x | /** @import { ArrowFunctionExpression, Expression, FunctionDeclaration, FunctionExpression } from 'estree' */
/** @import { AST, DelegatedEvent, SvelteNode } from '#compiler' */
/** @import { Context } from '../types' */
import { is_capture_event, is_delegated } from '../../../../utils.js';
import {
get_attribute_chunks,
get_attribute_expression,
is_event_attribute
} from '../../../utils/ast.js';
import { mark_subtree_dynamic } from './shared/fragment.js';
/**
* @param {AST.Attribute} node
* @param {Context} context
*/
export function Attribute(node, context) {
context.next();
// special case
if (node.name === 'value') {
const parent = /** @type {SvelteNode} */ (context.path.at(-1));
if (parent.type === 'RegularElement' && parent.name === 'option') {
mark_subtree_dynamic(context.path);
}
}
if (node.value !== true) {
for (const chunk of get_attribute_chunks(node.value)) {
if (chunk.type !== 'ExpressionTag') continue;
if (
chunk.expression.type === 'FunctionExpression' ||
chunk.expression.type === 'ArrowFunctionExpression'
) {
continue;
}
node.metadata.expression.has_state ||= chunk.metadata.expression.has_state;
node.metadata.expression.has_call ||= chunk.metadata.expression.has_call;
}
if (is_event_attribute(node)) {
const parent = context.path.at(-1);
if (parent?.type === 'RegularElement' || parent?.type === 'SvelteElement') {
context.state.analysis.uses_event_attributes = true;
}
const expression = get_attribute_expression(node);
const delegated_event = get_delegated_event(node.name.slice(2), expression, context);
if (delegated_event !== null) {
if (delegated_event.hoisted) {
delegated_event.function.metadata.hoisted = true;
}
node.metadata.delegated = delegated_event;
}
}
}
}
/** @type {DelegatedEvent} */
const unhoisted = { hoisted: false };
/**
* Checks if given event attribute can be delegated/hoisted and returns the corresponding info if so
* @param {string} event_name
* @param {Expression | null} handler
* @param {Context} context
* @returns {null | DelegatedEvent}
*/
function get_delegated_event(event_name, handler, context) {
// Handle delegated event handlers. Bail out if not a delegated event.
if (!handler || !is_delegated(event_name)) {
return null;
}
// If we are not working with a RegularElement, then bail out.
const element = context.path.at(-1);
if (element?.type !== 'RegularElement') {
return null;
}
/** @type {FunctionExpression | FunctionDeclaration | ArrowFunctionExpression | null} */
let target_function = null;
let binding = null;
if (element.metadata.has_spread) {
// event attribute becomes part of the dynamic spread array
return unhoisted;
}
if (handler.type === 'ArrowFunctionExpression' || handler.type === 'FunctionExpression') {
target_function = handler;
} else if (handler.type === 'Identifier') {
binding = context.state.scope.get(handler.name);
if (context.state.analysis.module.scope.references.has(handler.name)) {
// If a binding with the same name is referenced in the module scope (even if not declared there), bail out
return unhoisted;
}
if (binding != null) {
for (const { path } of binding.references) {
const parent = path.at(-1);
if (parent === undefined) return unhoisted;
const grandparent = path.at(-2);
/** @type {AST.RegularElement | null} */
let element = null;
/** @type {string | null} */
let event_name = null;
if (parent.type === 'OnDirective') {
element = /** @type {AST.RegularElement} */ (grandparent);
event_name = parent.name;
} else if (
parent.type === 'ExpressionTag' &&
grandparent?.type === 'Attribute' &&
is_event_attribute(grandparent)
) {
element = /** @type {AST.RegularElement} */ (path.at(-3));
const attribute = /** @type {AST.Attribute} */ (grandparent);
event_name = get_attribute_event_name(attribute.name);
}
if (element && event_name) {
if (
element.type !== 'RegularElement' ||
element.metadata.has_spread ||
!is_delegated(event_name)
) {
return unhoisted;
}
} else if (parent.type !== 'FunctionDeclaration' && parent.type !== 'VariableDeclarator') {
return unhoisted;
}
}
}
// If the binding is exported, bail out
if (context.state.analysis.exports.find((node) => node.name === handler.name)) {
return unhoisted;
}
if (binding !== null && binding.initial !== null && !binding.updated && !binding.is_called) {
const binding_type = binding.initial.type;
if (
binding_type === 'ArrowFunctionExpression' ||
binding_type === 'FunctionDeclaration' ||
binding_type === 'FunctionExpression'
) {
target_function = binding.initial;
}
}
}
// If we can't find a function, or the function has multiple parameters, bail out
if (target_function == null || target_function.params.length > 1) {
return unhoisted;
}
const visited_references = new Set();
const scope = target_function.metadata.scope;
for (const [reference] of scope.references) {
// Bail out if the arguments keyword is used or $host is referenced
if (reference === 'arguments' || reference === '$host') return unhoisted;
// Bail out if references a store subscription
if (scope.get(`$${reference}`)?.kind === 'store_sub') return unhoisted;
const binding = scope.get(reference);
const local_binding = context.state.scope.get(reference);
// If we are referencing a binding that is shadowed in another scope then bail out.
if (local_binding !== null && binding !== null && local_binding.node !== binding.node) {
return unhoisted;
}
// If we have multiple references to the same store using $ prefix, bail out.
if (
binding !== null &&
binding.kind === 'store_sub' &&
visited_references.has(reference.slice(1))
) {
return unhoisted;
}
// If we reference the index within an each block, then bail out.
if (binding !== null && binding.initial?.type === 'EachBlock') return unhoisted;
if (
binding !== null &&
// Bail out if the the binding is a rest param
(binding.declaration_kind === 'rest_param' ||
// Bail out if we reference anything from the EachBlock (for now) that mutates in non-runes mode,
(((!context.state.analysis.runes && binding.kind === 'each') ||
// or any normal not reactive bindings that are mutated.
binding.kind === 'normal') &&
binding.updated))
) {
return unhoisted;
}
visited_references.add(reference);
}
return { hoisted: true, function: target_function };
}
/**
* @param {string} event_name
*/
function get_attribute_event_name(event_name) {
event_name = event_name.slice(2);
if (is_capture_event(event_name)) {
event_name = event_name.slice(0, -7);
}
return event_name;
}
|