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| 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 | 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 2x 2x 5x 5x 5x 5x 5x 5x 5x 5x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 293x 293x 293x 293x 293x 293x 293x 293x 293x 2x 2x 2x 2x 2x 2x 2x 2x 2x 317x 15x 15x 15x 15x 15x 15x 15x 302x 302x 302x 302x 317x 172x 172x 130x 130x 130x 316x 99x 317x 99x 99x 31x 315x 1x 1x 1x 1x 1x 1x 31x 31x 31x 31x 315x 31x 31x 31x 2x 2x 2x 2x | /** @import { Expression } from 'estree' */
/** @import { AST, ExpressionMetadata, SvelteNode } from '#compiler' */
/** @import { ComponentContext } from '../../types' */
import { is_capture_event, is_passive_event } from '../../../../../../utils.js';
import { dev, locator } from '../../../../../state.js';
import * as b from '../../../../../utils/builders.js';
/**
* @param {AST.Attribute} node
* @param {ComponentContext} context
*/
export function visit_event_attribute(node, context) {
let capture = false;
let event_name = node.name.slice(2);
if (is_capture_event(event_name)) {
event_name = event_name.slice(0, -7);
capture = true;
}
// we still need to support the weird `onclick="{() => {...}}" form
const tag = Array.isArray(node.value)
? /** @type {AST.ExpressionTag} */ (node.value[0])
: /** @type {AST.ExpressionTag} */ (node.value);
let handler = build_event_handler(tag.expression, tag.metadata.expression, context);
if (node.metadata.delegated) {
let delegated_assignment;
if (!context.state.events.has(event_name)) {
context.state.events.add(event_name);
}
// Hoist function if we can, otherwise we leave the function as is
if (node.metadata.delegated.hoisted) {
if (node.metadata.delegated.function === tag.expression) {
const func_name = context.state.scope.root.unique('on_' + event_name);
context.state.hoisted.push(b.var(func_name, handler));
handler = func_name;
}
const hoisted_params = /** @type {Expression[]} */ (
node.metadata.delegated.function.metadata.hoisted_params
);
// When we hoist a function we assign an array with the function and all
// hoisted closure params.
const args = [handler, ...hoisted_params];
delegated_assignment = b.array(args);
} else {
delegated_assignment = handler;
}
context.state.init.push(
b.stmt(
b.assignment('=', b.member(context.state.node, '__' + event_name), delegated_assignment)
)
);
} else {
const statement = b.stmt(
build_event(
event_name,
context.state.node,
handler,
capture,
is_passive_event(event_name) ? true : undefined
)
);
const type = /** @type {SvelteNode} */ (context.path.at(-1)).type;
if (type === 'SvelteDocument' || type === 'SvelteWindow' || type === 'SvelteBody') {
// These nodes are above the component tree, and its events should run parent first
context.state.init.push(statement);
} else {
context.state.after_update.push(statement);
}
}
}
/**
* Creates a `$.event(...)` call for non-delegated event handlers
* @param {string} event_name
* @param {Expression} node
* @param {Expression} handler
* @param {boolean} capture
* @param {boolean | undefined} passive
*/
export function build_event(event_name, node, handler, capture, passive) {
return b.call(
'$.event',
b.literal(event_name),
node,
handler,
capture && b.true,
passive === undefined ? undefined : b.literal(passive)
);
}
/**
* Creates an event handler
* @param {Expression | null} node
* @param {ExpressionMetadata} metadata
* @param {ComponentContext} context
* @returns {Expression}
*/
export function build_event_handler(node, metadata, context) {
if (node === null) {
// bubble event
return b.function(
null,
[b.id('$$arg')],
b.block([b.stmt(b.call('$.bubble_event.call', b.this, b.id('$$props'), b.id('$$arg')))])
);
}
let handler = /** @type {Expression} */ (context.visit(node));
// inline handler
if (handler.type === 'ArrowFunctionExpression' || handler.type === 'FunctionExpression') {
return handler;
}
// function declared in the script
if (
handler.type === 'Identifier' &&
context.state.scope.get(handler.name)?.declaration_kind !== 'import'
) {
return handler;
}
if (metadata.has_call) {
// memoize where necessary
const id = b.id(context.state.scope.generate('event_handler'));
context.state.init.push(b.var(id, b.call('$.derived', b.thunk(handler))));
handler = b.call('$.get', id);
}
// wrap the handler in a function, so the expression is re-evaluated for each event
let call = b.call(b.member(handler, 'apply', false, true), b.this, b.id('$$args'));
if (dev) {
const loc = locator(/** @type {number} */ (node.start));
const remove_parens =
node.type === 'CallExpression' &&
node.arguments.length === 0 &&
node.callee.type === 'Identifier';
call = b.call(
'$.apply',
b.thunk(handler),
b.this,
b.id('$$args'),
b.id(context.state.analysis.name),
loc && b.array([b.literal(loc.line), b.literal(loc.column)]),
has_side_effects(node) && b.true,
remove_parens && b.true
);
}
return b.function(null, [b.rest(b.id('$$args'))], b.block([b.stmt(call)]));
}
/**
* @param {Expression} node
*/
function has_side_effects(node) {
if (
node.type === 'CallExpression' ||
node.type === 'NewExpression' ||
node.type === 'AssignmentExpression' ||
node.type === 'UpdateExpression'
) {
return true;
}
if (node.type === 'SequenceExpression') {
return node.expressions.some(has_side_effects);
}
return false;
}
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