Press n or j to go to the next uncovered block, b, p or k for the previous block.
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1x 1x 579x 579x 594x 15x 15x 15x 15x 15x 15x 15x 594x 2x 2x 2x 2x 2x 2x 575x 575x 575x 575x 575x 575x 575x 563x 563x 563x 563x 563x 150x 150x 150x 99x 99x 150x 150x 115x 102x 102x 102x 102x 115x 115x 115x 115x 115x 115x 115x 115x 150x 35x 35x 35x 150x 150x 150x 150x 150x 150x 150x 150x 150x 150x 150x 150x 413x 562x 4x 4x 413x 413x 413x 413x 413x 413x 413x 413x 562x 562x 413x 413x 413x 413x 574x 12x 12x 12x 12x 425x 425x 575x 10x 574x 415x 415x 575x 2x 2x 2x 2x 2x 159x 159x 159x 159x 159x 159x 159x 159x 2x 159x 2x 2x 2x 159x 159x 159x 159x 159x 159x 159x 159x 159x 159x 159x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 5367x 5367x 5367x 5367x 5367x 5367x 5367x 5367x 5367x 5367x 5367x 5367x 4114x 3386x 3386x 3386x 2544x 2544x 2544x 2544x 2544x 842x 842x 842x 842x 842x 842x 842x 842x 842x 842x 842x 842x 842x 3386x 172x 3375x 623x 670x 47x 47x 47x 47x 47x 47x 47x 47x 47x 47x 47x 47x 47x 842x 842x 842x 4114x 728x 728x 728x 728x 728x 728x 728x 728x 728x 54x 728x 674x 577x 674x 577x 669x 97x 97x 728x 728x 728x 728x 4114x 5367x 5367x 9641x 9641x 9641x 5919x 9641x 3722x 1566x 1566x 1566x 3722x 3722x 3722x 3722x 3722x 3722x 3722x 3722x 84x 84x 3722x 3638x 3638x 3638x 3638x 3638x 3638x 3638x 3638x 3638x 3638x 3638x 3638x 3638x 3638x 3722x 3722x 9641x 9641x 5366x 2548x 2548x 5367x 2x 2x 2x 2x 2x 2x 5208x 5208x 5208x 5208x 5077x 5077x 5077x 5077x 5208x 5208x 2x 2x 2x 2x 2x 2x 1731x 1731x 1731x 1731x 26x 26x 1705x 1731x 1705x 1731x 1657x 1657x 1003x 1657x 654x 654x 654x 654x 654x 654x 654x 654x 1657x 48x 48x 48x 2x 2x 2x 2x 2x 2x 2x 781x 781x 781x 781x 781x 781x 781x 781x 781x 781x 781x 2662x 2662x 2662x 70x 12x 12x 70x 70x 2662x 781x 781x 2662x 2662x 2662x 1150x 1150x 2659x 9x 9x 9x 9x 1512x 1503x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 1503x 1483x 1483x 1503x 1503x 2662x 781x 781x 781x 781x 2x 2x 2x 2x 2757x 2757x 2x 2x 5x 5x 2x 2x 44x 44x 44x 44x 44x 44x 44x 44x 44x 44x 44x 44x 44x 2x 2x 126x 126x 126x 64x 64x 64x 64x 64x 64x 64x 64x 64x 64x 64x 64x 64x 64x 2x 2x 126x 62x 62x 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33x 3450x 3450x 3450x 3450x 3450x 3450x 3450x 3450x 3454x 81x 81x 81x 81x 81x 81x 81x 81x 81x 3454x 3369x 1219x 154x 154x 154x 1065x 1219x 110x 110x 110x 955x 955x 1060x 952x 1219x 804x 804x 804x 804x 804x 801x 801x 801x 801x 801x 801x 801x 801x 801x 801x 801x 804x 154x 154x 1200x 1219x 1219x 1219x 1219x 3369x 3450x 3450x 3450x 3450x 3450x 3450x 3450x 3450x 3450x 3450x 3450x 3450x 3450x 3450x 3450x 3453x 3441x 3441x 3454x 3454x 3454x 3454x 3454x 3454x 3454x 3454x 3454x 3454x 3454x 3454x 7x 7x 3450x 3450x 3450x 3450x 1778x 1778x 1778x 1778x 1778x 3450x 3450x 3450x 3450x 3450x 3454x 3190x 3190x 2x 2x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 27x 8x 27x 7x 19x 2x 11x 1x 10x 9x 9x 9x 27x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 6x 5x 5x 6x 6x 56x 56x 56x 56x 7x 7x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 56x 52x 56x 56x 56x 56x 56x 56x 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449x 449x 449x 449x 449x 449x 449x 26x 26x 26x 26x 26x 26x 26x 449x 449x 2x 2x 294x 294x 294x 294x 294x 294x 294x 294x 294x 294x 294x 294x 294x 100x 100x 100x 85x 85x 85x 100x 100x 100x 294x 294x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 294x 294x 2x 2x 81x 81x 81x 81x 81x 81x 81x 81x 81x 81x 42x 42x 42x 81x 81x 81x 69x 69x 63x 63x 63x 69x 69x 69x 81x 81x 81x 48x 48x 45x 45x 45x 48x 48x 48x 81x 81x 81x 81x 2x 2x 13x 13x 13x 13x 13x 13x 2x 2x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 21x 21x 21x 21x 21x 12x 12x 12x 12x 12x 12x 12x 12x 12x 12x 12x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 32x 38x 6x 6x 38x 4x 4x 2x 2x 2x 2x 1x 2x 2x 416x 2x 2x 41x 41x 41x 26x 26x 41x 41x 41x 41x 41x 41x 41x 41x 41x 41x 41x 41x 41x 41x 26x 26x 41x 41x 41x 41x 2x 2x 286x 286x 286x 286x 286x 286x 286x 286x 286x 286x 286x 286x 286x 286x 286x 286x 286x 286x 286x 286x 286x 6x 6x 6x 6x 6x 6x 6x 6x 6x 286x 280x 280x 280x 280x 280x 280x 280x 2x 2x 2x 2x 2x 2x 2x 280x 280x 280x 280x 280x 4x 4x 280x 280x 280x 280x 280x 280x 280x 280x 280x 280x 280x 280x 280x 280x 280x 280x 280x 280x 280x 280x 280x 280x 280x 280x 280x 280x 280x 123x 123x 33x 123x 90x 90x 123x 123x 280x 280x 280x 280x 67x 67x 280x 280x 280x 6x 6x 6x 6x 6x 6x 6x 6x 280x 280x 280x 17x 17x 280x 280x 61x 61x 61x 18x 18x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 201x 201x 201x 30x 61x 61x 61x 61x 30x 30x 30x 30x 30x 30x 30x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 280x 280x 280x 280x 286x 286x 286x 286x 67x 285x 219x 219x 2x 2x 528x 528x 528x 528x 528x 528x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 527x 527x 2x 2x 6x 6x 6x 2x 2x 38x 38x 38x 38x 2x 2x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 2x 2x 5x 5x 5x 2x 2x 103x 103x 103x 8x 8x 8x 8x 14x 14x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 6x 8x 8x 8x 8x 8x 8x 8x 8x 8x 103x 95x 95x 95x 95x 95x 95x 95x 95x 95x 95x 95x 2x 2x 114x 2x 2x 31x 31x 31x 31x 52x 24x 24x 52x 31x 31x 31x 31x 31x 31x 31x 31x 31x 31x 31x 31x 31x 31x 31x 31x 31x 31x 31x 2x 2x 229x 229x 229x 229x 229x 229x 229x 229x 229x 229x 229x 229x 229x 229x 229x 229x 229x 229x 167x 4x 4x 4x 167x 162x 162x 77x 77x 162x 83x 61x 83x 22x 22x 83x 163x 1x 1x 167x 229x 229x 229x 229x 229x 229x 229x 229x 229x 229x 229x 229x 43x 43x 229x 229x 229x 229x 229x 229x 229x 229x 2x 2x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 2x 2x 13x 13x 8x 8x 8x 8x 8x 8x 8x 8x 8x 11x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 2x 2x 4x 4x 4x 4x 2x 2x 12x 12x 12x 12x 2x 2x 4x 4x 4x 4x 2x 2x 2x 2x | import {
extract_identifiers,
extract_paths,
is_event_attribute,
is_text_attribute,
object,
unwrap_optional
} from '../../../../utils/ast.js';
import { binding_properties } from '../../../bindings.js';
import {
clean_nodes,
determine_namespace_for_children,
escape_html,
infer_namespace
} from '../../utils.js';
import { DOMProperties, PassiveEvents, VoidElements } from '../../../constants.js';
import { is_custom_element_node, is_element_node } from '../../../nodes.js';
import * as b from '../../../../utils/builders.js';
import { error } from '../../../../errors.js';
import {
with_loc,
function_visitor,
get_assignment_value,
serialize_get_binding,
serialize_set_binding
} from '../utils.js';
import {
AttributeAliases,
DOMBooleanAttributes,
EACH_INDEX_REACTIVE,
EACH_IS_ANIMATED,
EACH_IS_CONTROLLED,
EACH_IS_STRICT_EQUALS,
EACH_ITEM_REACTIVE,
EACH_KEYED,
TEMPLATE_FRAGMENT,
TEMPLATE_USE_IMPORT_NODE,
TRANSITION_GLOBAL,
TRANSITION_IN,
TRANSITION_OUT
} from '../../../../../constants.js';
import { regex_is_valid_identifier } from '../../../patterns.js';
import { javascript_visitors_runes } from './javascript-runes.js';
import { sanitize_template_string } from '../../../../utils/sanitize_template_string.js';
import { walk } from 'zimmerframe';
/**
* @param {import('#compiler').RegularElement | import('#compiler').SvelteElement} element
* @param {import('#compiler').Attribute} attribute
* @param {{ state: { metadata: { namespace: import('#compiler').Namespace }}}} context
*/
function get_attribute_name(element, attribute, context) {
let name = attribute.name;
if (!element.metadata.svg && context.state.metadata.namespace !== 'foreign') {
name = name.toLowerCase();
if (name in AttributeAliases) {
name = AttributeAliases[name];
}
}
return name;
}
/**
* Serializes each style directive into something like `$.set_style(element, style_property, value)`
* and adds it either to init or update, depending on whether or not the value or the attributes are dynamic.
* @param {import('#compiler').StyleDirective[]} style_directives
* @param {import('estree').Identifier} element_id
* @param {import('../types.js').ComponentContext} context
* @param {boolean} is_attributes_reactive
*/
function serialize_style_directives(style_directives, element_id, context, is_attributes_reactive) {
const state = context.state;
for (const directive of style_directives) {
let value =
directive.value === true
? serialize_get_binding({ name: directive.name, type: 'Identifier' }, context.state)
: serialize_attribute_value(directive.value, context)[1];
const update = b.stmt(
b.call(
'$.set_style',
element_id,
b.literal(directive.name),
value,
/** @type {import('estree').Expression} */ (
directive.modifiers.includes('important') ? b.true : undefined
)
)
);
const contains_call_expression =
Array.isArray(directive.value) &&
directive.value.some(
(v) => v.type === 'ExpressionTag' && v.metadata.contains_call_expression
);
if (!is_attributes_reactive && contains_call_expression) {
state.init.push(serialize_update(update));
} else if (is_attributes_reactive || directive.metadata.dynamic || contains_call_expression) {
state.update.push(update);
} else {
state.init.push(update);
}
}
}
/**
* For unfortunate legacy reasons, directive names can look like this `use:a.b-c`
* This turns that string into a member expression
* @param {string} name
*/
function parse_directive_name(name) {
// this allow for accessing members of an object
const parts = name.split('.');
let part = /** @type {string} */ (parts.shift());
/** @type {import('estree').Identifier | import('estree').MemberExpression} */
let expression = b.id(part);
while ((part = /** @type {string} */ (parts.shift()))) {
const computed = !regex_is_valid_identifier.test(part);
expression = b.member(expression, computed ? b.literal(part) : b.id(part), computed);
}
return expression;
}
/**
* Serializes each class directive into something like `$.class_toogle(element, class_name, value)`
* and adds it either to init or update, depending on whether or not the value or the attributes are dynamic.
* @param {import('#compiler').ClassDirective[]} class_directives
* @param {import('estree').Identifier} element_id
* @param {import('../types.js').ComponentContext} context
* @param {boolean} is_attributes_reactive
*/
function serialize_class_directives(class_directives, element_id, context, is_attributes_reactive) {
const state = context.state;
for (const directive of class_directives) {
const value = /** @type {import('estree').Expression} */ (context.visit(directive.expression));
const update = b.stmt(b.call('$.toggle_class', element_id, b.literal(directive.name), value));
const contains_call_expression = directive.expression.type === 'CallExpression';
if (!is_attributes_reactive && contains_call_expression) {
state.init.push(serialize_update(update));
} else if (is_attributes_reactive || directive.metadata.dynamic || contains_call_expression) {
state.update.push(update);
} else {
state.init.push(update);
}
}
}
/**
* @param {import('#compiler').Binding[]} references
* @param {import('../types.js').ComponentContext} context
*/
function serialize_transitive_dependencies(references, context) {
/** @type {Set<import('#compiler').Binding>} */
const dependencies = new Set();
for (const ref of references) {
const deps = collect_transitive_dependencies(ref);
for (const dep of deps) {
dependencies.add(dep);
}
}
return [...dependencies].map((dep) => serialize_get_binding({ ...dep.node }, context.state));
}
/**
* @param {import('#compiler').Binding} binding
* @param {Set<import('#compiler').Binding>} seen
* @returns {import('#compiler').Binding[]}
*/
function collect_transitive_dependencies(binding, seen = new Set()) {
if (binding.kind !== 'legacy_reactive') return [];
for (const dep of binding.legacy_dependencies) {
if (!seen.has(dep)) {
seen.add(dep);
for (const transitive_dep of collect_transitive_dependencies(dep, seen)) {
seen.add(transitive_dep);
}
}
}
return [...seen];
}
/**
* Special case: if we have a value binding on a select element, we need to set up synchronization
* between the value binding and inner signals, for indirect updates
* @param {import('#compiler').BindDirective} value_binding
* @param {import('../types.js').ComponentContext} context
*/
function setup_select_synchronization(value_binding, context) {
if (context.state.analysis.runes) return;
let bound = value_binding.expression;
while (bound.type === 'MemberExpression') {
bound = /** @type {import('estree').Identifier | import('estree').MemberExpression} */ (
bound.object
);
}
/** @type {string[]} */
const names = [];
for (const [name, refs] of context.state.scope.references) {
if (
refs.length > 0 &&
// prevent infinite loop
name !== bound.name
) {
names.push(name);
}
}
const invalidator = b.call(
'$.invalidate_inner_signals',
b.thunk(
b.block(
names.map((name) => {
const serialized = serialize_get_binding(b.id(name), context.state);
return b.stmt(serialized);
})
)
)
);
context.state.init.push(
b.stmt(
b.call(
'$.render_effect',
b.thunk(
b.block([
b.stmt(
/** @type {import('estree').Expression} */ (context.visit(value_binding.expression))
),
b.stmt(invalidator)
])
)
)
)
);
}
/**
* @param {Array<import('#compiler').Attribute | import('#compiler').SpreadAttribute>} attributes
* @param {import('../types.js').ComponentContext} context
* @param {import('#compiler').RegularElement} element
* @param {import('estree').Identifier} element_id
* @param {boolean} needs_select_handling
*/
function serialize_element_spread_attributes(
attributes,
context,
element,
element_id,
needs_select_handling
) {
let needs_isolation = false;
/** @type {import('estree').Expression[]} */
const values = [];
for (const attribute of attributes) {
if (attribute.type === 'Attribute') {
const name = get_attribute_name(element, attribute, context);
// TODO: handle contains_call_expression
const [, value] = serialize_attribute_value(attribute.value, context);
values.push(b.object([b.init(name, value)]));
} else {
values.push(/** @type {import('estree').Expression} */ (context.visit(attribute)));
}
needs_isolation ||=
attribute.type === 'SpreadAttribute' && attribute.metadata.contains_call_expression;
}
const lowercase_attributes =
element.metadata.svg || is_custom_element_node(element) ? b.false : b.true;
const id = context.state.scope.generate('attributes');
const update = b.stmt(
b.assignment(
'=',
b.id(id),
b.call(
'$.set_attributes',
element_id,
b.id(id),
b.array(values),
lowercase_attributes,
b.literal(context.state.analysis.css.hash)
)
)
);
context.state.init.push(b.let(id));
// objects could contain reactive getters -> play it safe and always assume spread attributes are reactive
if (needs_isolation) {
context.state.init.push(serialize_update(update));
} else {
context.state.update.push(update);
}
if (needs_select_handling) {
context.state.init.push(
b.stmt(b.call('$.init_select', element_id, b.thunk(b.member(b.id(id), b.id('value')))))
);
context.state.update.push(
b.if(
b.binary('in', b.literal('value'), b.id(id)),
b.block([
// This ensures a one-way street to the DOM in case it's <select {value}>
// and not <select bind:value>. We need it in addition to $.init_select
// because the select value is not reflected as an attribute, so the
// mutation observer wouldn't notice.
b.stmt(b.call('$.select_option', element_id, b.member(b.id(id), b.id('value'))))
])
)
);
}
}
/**
* Serializes dynamic element attribute assignments.
* Returns the `true` if spread is deemed reactive.
* @param {Array<import('#compiler').Attribute | import('#compiler').SpreadAttribute>} attributes
* @param {import('../types.js').ComponentContext} context
* @param {import('estree').Identifier} element_id
* @returns {boolean}
*/
function serialize_dynamic_element_attributes(attributes, context, element_id) {
if (attributes.length === 0) {
if (context.state.analysis.css.hash) {
context.state.init.push(
b.stmt(b.call('$.set_class', element_id, b.literal(context.state.analysis.css.hash)))
);
}
return false;
}
// TODO why are we always treating this as a spread? needs docs, if that's not an error
let needs_isolation = false;
let is_reactive = false;
/** @type {import('estree').Expression[]} */
const values = [];
for (const attribute of attributes) {
if (attribute.type === 'Attribute') {
const [, value] = serialize_attribute_value(attribute.value, context);
values.push(b.object([b.init(attribute.name, value)]));
} else {
values.push(/** @type {import('estree').Expression} */ (context.visit(attribute)));
}
is_reactive ||=
attribute.metadata.dynamic ||
// objects could contain reactive getters -> play it safe and always assume spread attributes are reactive
attribute.type === 'SpreadAttribute';
needs_isolation ||=
attribute.type === 'SpreadAttribute' && attribute.metadata.contains_call_expression;
}
if (needs_isolation || is_reactive) {
const id = context.state.scope.generate('attributes');
context.state.init.push(b.let(id));
const update = b.stmt(
b.assignment(
'=',
b.id(id),
b.call(
'$.set_dynamic_element_attributes',
element_id,
b.id(id),
b.array(values),
b.literal(context.state.analysis.css.hash)
)
)
);
if (needs_isolation) {
context.state.init.push(serialize_update(update));
return false;
}
context.state.update.push(update);
return true;
}
context.state.init.push(
b.stmt(
b.call(
'$.set_dynamic_element_attributes',
element_id,
b.literal(null),
b.array(values),
b.literal(context.state.analysis.css.hash)
)
)
);
return false;
}
/**
* Serializes an assignment to an element property by adding relevant statements to either only
* the init or the the init and update arrays, depending on whether or not the value is dynamic.
* Resulting code for static looks something like this:
* ```js
* element.property = value;
* // or
* $.set_attribute(element, property, value);
* });
* ```
* Resulting code for dynamic looks something like this:
* ```js
* let value;
* $.render_effect(() => {
* if (value !== (value = 'new value')) {
* element.property = value;
* // or
* $.set_attribute(element, property, value);
* }
* });
* ```
* Returns true if attribute is deemed reactive, false otherwise.
* @param {import('#compiler').RegularElement} element
* @param {import('estree').Identifier} node_id
* @param {import('#compiler').Attribute} attribute
* @param {import('../types.js').ComponentContext} context
* @returns {boolean}
*/
function serialize_element_attribute_update_assignment(element, node_id, attribute, context) {
const state = context.state;
const name = get_attribute_name(element, attribute, context);
const is_svg = context.state.metadata.namespace === 'svg';
let [contains_call_expression, value] = serialize_attribute_value(attribute.value, context);
// The foreign namespace doesn't have any special handling, everything goes through the attr function
if (context.state.metadata.namespace === 'foreign') {
const statement = b.stmt(b.call('$.set_attribute', node_id, b.literal(name), value));
if (attribute.metadata.dynamic) {
const id = state.scope.generate(`${node_id.name}_${name}`);
serialize_update_assignment(state, id, undefined, value, statement);
return true;
} else {
state.init.push(statement);
return false;
}
}
if (name === 'autofocus') {
state.init.push(b.stmt(b.call('$.autofocus', node_id, value)));
return false;
}
/** @type {import('estree').Statement} */
let update;
if (name === 'class') {
update = b.stmt(b.call(is_svg ? '$.set_svg_class' : '$.set_class', node_id, value));
} else if (DOMProperties.includes(name)) {
update = b.stmt(b.assignment('=', b.member(node_id, b.id(name)), value));
} else {
const callee = name.startsWith('xlink') ? '$.set_xlink_attribute' : '$.set_attribute';
update = b.stmt(b.call(callee, node_id, b.literal(name), value));
}
if (attribute.metadata.dynamic) {
if (contains_call_expression) {
state.init.push(serialize_update(update));
} else {
state.update.push(update);
}
return true;
} else {
state.init.push(update);
return false;
}
}
/**
* Like `serialize_element_attribute_update_assignment` but without any special attribute treatment.
* @param {import('estree').Identifier} node_id
* @param {import('#compiler').Attribute} attribute
* @param {import('../types.js').ComponentContext} context
* @returns {boolean}
*/
function serialize_custom_element_attribute_update_assignment(node_id, attribute, context) {
const state = context.state;
const name = attribute.name; // don't lowercase, as we set the element's property, which might be case sensitive
let [contains_call_expression, value] = serialize_attribute_value(attribute.value, context);
const update = b.stmt(b.call('$.set_custom_element_data', node_id, b.literal(name), value));
if (attribute.metadata.dynamic) {
if (contains_call_expression) {
state.init.push(serialize_update(update));
} else {
state.update.push(update);
}
return true;
} else {
state.init.push(update);
return false;
}
}
/**
* Serializes an assignment to the value property of a `<select>`, `<option>` or `<input>` element
* that needs the hidden `__value` property.
* Returns true if attribute is deemed reactive, false otherwise.
* @param {string} element
* @param {import('estree').Identifier} node_id
* @param {import('#compiler').Attribute} attribute
* @param {import('../types.js').ComponentContext} context
* @returns {boolean}
*/
function serialize_element_special_value_attribute(element, node_id, attribute, context) {
const state = context.state;
const [, value] = serialize_attribute_value(attribute.value, context);
const inner_assignment = b.assignment(
'=',
b.member(node_id, b.id('value')),
b.conditional(
b.binary('==', b.literal(null), b.assignment('=', b.member(node_id, b.id('__value')), value)),
b.literal(''), // render null/undefined values as empty string to support placeholder options
value
)
);
const is_reactive = attribute.metadata.dynamic;
const is_select_with_value =
// attribute.metadata.dynamic would give false negatives because even if the value does not change,
// the inner options could still change, so we need to always treat it as reactive
element === 'select' && attribute.value !== true && !is_text_attribute(attribute);
const update = b.stmt(
is_select_with_value
? b.sequence([
inner_assignment,
// This ensures a one-way street to the DOM in case it's <select {value}>
// and not <select bind:value>. We need it in addition to $.init_select
// because the select value is not reflected as an attribute, so the
// mutation observer wouldn't notice.
b.call('$.select_option', node_id, value)
])
: inner_assignment
);
if (is_select_with_value) {
state.init.push(b.stmt(b.call('$.init_select', node_id, b.thunk(value))));
}
if (is_reactive) {
const id = state.scope.generate(`${node_id.name}_value`);
serialize_update_assignment(state, id, undefined, value, update);
return true;
} else {
state.init.push(update);
return false;
}
}
/**
* @param {import('../types.js').ComponentClientTransformState} state
* @param {string} id
* @param {import('estree').Expression | undefined} init
* @param {import('estree').Expression} value
* @param {import('estree').ExpressionStatement} update
*/
function serialize_update_assignment(state, id, init, value, update) {
state.init.push(b.var(id, init));
state.update.push(
b.if(b.binary('!==', b.id(id), b.assignment('=', b.id(id), value)), b.block([update]))
);
}
/**
* @param {import('../types.js').ComponentContext} context
*/
function collect_parent_each_blocks(context) {
return /** @type {import('#compiler').EachBlock[]} */ (
context.path.filter((node) => node.type === 'EachBlock')
);
}
/**
* @param {import('#compiler').Component | import('#compiler').SvelteComponent | import('#compiler').SvelteSelf} node
* @param {string} component_name
* @param {import('../types.js').ComponentContext} context
* @returns {import('estree').Statement}
*/
function serialize_inline_component(node, component_name, context) {
/** @type {Array<import('estree').Property[] | import('estree').Expression>} */
const props_and_spreads = [];
/** @type {import('estree').ExpressionStatement[]} */
const lets = [];
/** @type {Record<string, import('#compiler').TemplateNode[]>} */
const children = {};
/** @type {Record<string, import('estree').Expression[]>} */
const events = {};
/** @type {import('estree').Property[]} */
const custom_css_props = [];
/** @type {import('estree').Identifier | import('estree').MemberExpression | null} */
let bind_this = null;
const binding_initializers = [];
/**
* If this component has a slot property, it is a named slot within another component. In this case
* the slot scope applies to the component itself, too, and not just its children.
*/
let slot_scope_applies_to_itself = false;
/**
* @param {import('estree').Property} prop
*/
function push_prop(prop) {
const current = props_and_spreads.at(-1);
const current_is_props = Array.isArray(current);
const props = current_is_props ? current : [];
props.push(prop);
if (!current_is_props) {
props_and_spreads.push(props);
}
}
for (const attribute of node.attributes) {
if (attribute.type === 'LetDirective') {
lets.push(/** @type {import('estree').ExpressionStatement} */ (context.visit(attribute)));
} else if (attribute.type === 'OnDirective') {
events[attribute.name] ||= [];
let handler = serialize_event_handler(attribute, context);
if (attribute.modifiers.includes('once')) {
handler = b.call('$.once', handler);
}
events[attribute.name].push(handler);
} else if (attribute.type === 'SpreadAttribute') {
const expression = /** @type {import('estree').Expression} */ (context.visit(attribute));
if (attribute.metadata.dynamic) {
let value = expression;
if (attribute.metadata.contains_call_expression) {
const id = b.id(context.state.scope.generate('spread_element'));
context.state.init.push(b.var(id, b.call('$.derived', b.thunk(value))));
value = b.call('$.get', id);
}
props_and_spreads.push(b.thunk(value));
} else {
props_and_spreads.push(expression);
}
} else if (attribute.type === 'Attribute') {
if (attribute.name.startsWith('--')) {
custom_css_props.push(
b.init(attribute.name, serialize_attribute_value(attribute.value, context)[1])
);
continue;
}
if (attribute.name === 'slot') {
slot_scope_applies_to_itself = true;
}
const [, value] = serialize_attribute_value(attribute.value, context);
if (attribute.metadata.dynamic) {
let arg = value;
// When we have a non-simple computation, anything other than an Identifier or Member expression,
// then there's a good chance it needs to be memoized to avoid over-firing when read within the
// child component.
const should_wrap_in_derived =
Array.isArray(attribute.value) &&
attribute.value.some((n) => {
return (
n.type === 'ExpressionTag' &&
n.expression.type !== 'Identifier' &&
n.expression.type !== 'MemberExpression'
);
});
if (should_wrap_in_derived) {
const id = b.id(context.state.scope.generate(attribute.name));
context.state.init.push(b.var(id, b.call('$.derived', b.thunk(value))));
arg = b.call('$.get', id);
}
push_prop(b.get(attribute.name, [b.return(arg)]));
} else {
push_prop(b.init(attribute.name, value));
}
} else if (attribute.type === 'BindDirective') {
if (attribute.name === 'this') {
bind_this = attribute.expression;
} else {
const expression = /** @type {import('estree').Expression} */ (
context.visit(attribute.expression)
);
if (context.state.options.dev) {
binding_initializers.push(
b.stmt(
b.call(
b.id('$.user_pre_effect'),
b.thunk(b.call(b.id('$.add_owner'), expression, b.id(component_name)))
)
)
);
}
push_prop(b.get(attribute.name, [b.return(expression)]));
const assignment = b.assignment('=', attribute.expression, b.id('$$value'));
push_prop(
b.set(attribute.name, [
b.stmt(serialize_set_binding(assignment, context, () => context.visit(assignment)))
])
);
}
}
}
if (slot_scope_applies_to_itself) {
context.state.init.push(...lets);
}
if (Object.keys(events).length > 0) {
const events_expression = b.object(
Object.keys(events).map((name) =>
b.init(name, events[name].length > 1 ? b.array(events[name]) : events[name][0])
)
);
push_prop(b.init('$$events', events_expression));
}
/** @type {import('estree').Statement[]} */
const snippet_declarations = [];
// Group children by slot
for (const child of node.fragment.nodes) {
if (child.type === 'SnippetBlock') {
// the SnippetBlock visitor adds a declaration to `init`, but if it's directly
// inside a component then we want to hoist them into a block so that they
// can be used as props without creating conflicts
context.visit(child, {
...context.state,
init: snippet_declarations
});
push_prop(b.prop('init', child.expression, child.expression));
continue;
}
let slot_name = 'default';
if (is_element_node(child)) {
const attribute = /** @type {import('#compiler').Attribute | undefined} */ (
child.attributes.find(
(attribute) => attribute.type === 'Attribute' && attribute.name === 'slot'
)
);
if (attribute !== undefined) {
slot_name = /** @type {import('#compiler').Text[]} */ (attribute.value)[0].data;
}
}
children[slot_name] = children[slot_name] || [];
children[slot_name].push(child);
}
// Serialize each slot
/** @type {import('estree').Property[]} */
const serialized_slots = [];
for (const slot_name of Object.keys(children)) {
const body = create_block(node, `${node.name}_${slot_name}`, children[slot_name], context);
if (body.length === 0) continue;
const slot_fn = b.arrow(
[b.id('$$anchor'), b.id('$$slotProps')],
b.block([...(slot_name === 'default' && !slot_scope_applies_to_itself ? lets : []), ...body])
);
if (slot_name === 'default') {
push_prop(
b.init(
'children',
context.state.options.dev ? b.call('$.add_snippet_symbol', slot_fn) : slot_fn
)
);
} else {
serialized_slots.push(b.init(slot_name, slot_fn));
}
}
if (serialized_slots.length > 0) {
push_prop(b.init('$$slots', b.object(serialized_slots)));
}
const props_expression =
props_and_spreads.length === 0 ||
(props_and_spreads.length === 1 && Array.isArray(props_and_spreads[0]))
? b.object(/** @type {import('estree').Property[]} */ (props_and_spreads[0]) || [])
: b.call(
'$.spread_props',
...props_and_spreads.map((p) => (Array.isArray(p) ? b.object(p) : p))
);
/** @param {import('estree').Identifier} node_id */
let fn = (node_id) =>
b.call(
context.state.options.dev
? b.call('$.validate_component', b.id(component_name))
: component_name,
node_id,
props_expression
);
if (bind_this !== null) {
const prev = fn;
fn = (node_id) =>
serialize_bind_this(
/** @type {import('estree').Identifier | import('estree').MemberExpression} */ (bind_this),
context,
prev(node_id)
);
}
if (Object.keys(custom_css_props).length > 0) {
const prev = fn;
fn = (node_id) =>
b.call(
'$.css_props',
node_id,
// TODO would be great to do this at runtime instead. Svelte 4 also can't handle cases today
// where it's not statically determinable whether the component is used in a svg or html context
context.state.metadata.namespace === 'svg' ? b.false : b.true,
b.thunk(b.object(custom_css_props)),
b.arrow([b.id('$$node')], prev(b.id('$$node')))
);
}
const statements = [
...snippet_declarations,
...binding_initializers,
b.stmt(fn(context.state.node))
];
return statements.length > 1 ? b.block(statements) : statements[0];
}
/**
* Serializes `bind:this` for components and elements.
* @param {import('estree').Identifier | import('estree').MemberExpression} bind_this
* @param {import('zimmerframe').Context<import('#compiler').SvelteNode, import('../types.js').ComponentClientTransformState>} context
* @param {import('estree').Expression} node
* @returns
*/
function serialize_bind_this(bind_this, context, node) {
let i = 0;
/** @type {Map<import('#compiler').Binding, [arg_idx: number, transformed: import('estree').Expression, expression: import('#compiler').Binding['expression']]>} */
const each_ids = new Map();
// Transform each reference to an each block context variable into a $$value_<i> variable
// by temporarily changing the `expression` of the corresponding binding.
// These $$value_<i> variables will be filled in by the bind_this runtime function through its last argument.
// Note that we only do this for each context variables, the consequence is that the value might be stale in
// some scenarios where the value is a member expression with changing computed parts or using a combination of multiple
// variables, but that was the same case in Svelte 4, too. Once legacy mode is gone completely, we can revisit this.
walk(
bind_this,
{},
{
Identifier(node) {
const binding = context.state.scope.get(node.name);
if (!binding || each_ids.has(binding)) return;
const associated_node = Array.from(context.state.scopes.entries()).find(
([_, scope]) => scope === binding?.scope
)?.[0];
if (associated_node?.type === 'EachBlock') {
each_ids.set(binding, [
i,
/** @type {import('estree').Expression} */ (context.visit(node)),
binding.expression
]);
binding.expression = b.id('$$value_' + i);
i++;
}
}
}
);
const bind_this_id = /** @type {import('estree').Expression} */ (context.visit(bind_this));
const ids = Array.from(each_ids.values()).map((id) => b.id('$$value_' + id[0]));
const assignment = b.assignment('=', bind_this, b.id('$$value'));
const update = serialize_set_binding(assignment, context, () => context.visit(assignment));
for (const [binding, [, , expression]] of each_ids) {
// reset expressions to what they were before
binding.expression = expression;
}
/** @type {import('estree').Expression[]} */
const args = [node, b.arrow([b.id('$$value'), ...ids], update), b.arrow([...ids], bind_this_id)];
// If we're mutating a property, then it might already be non-existent.
// If we make all the object nodes optional, then it avoids any runtime exceptions.
/** @type {import('estree').Expression | import('estree').Super} */
let bind_node = bind_this_id;
while (bind_node?.type === 'MemberExpression') {
bind_node.optional = true;
bind_node = bind_node.object;
}
if (each_ids.size) {
args.push(b.thunk(b.array(Array.from(each_ids.values()).map((id) => id[1]))));
}
return b.call('$.bind_this', ...args);
}
/**
* Creates a new block which looks roughly like this:
* ```js
* // hoisted:
* const block_name = $.template(`...`);
*
* // for the main block:
* const id = block_name();
* // init stuff and possibly render effect
* $.append($$anchor, id);
* ```
* Adds the hoisted parts to `context.state.hoisted` and returns the statements of the main block.
* @param {import('#compiler').SvelteNode} parent
* @param {string} name
* @param {import('#compiler').SvelteNode[]} nodes
* @param {import('../types.js').ComponentContext} context
* @returns {import('estree').Statement[]}
*/
function create_block(parent, name, nodes, context) {
const namespace = infer_namespace(context.state.metadata.namespace, parent, nodes, context.path);
const { hoisted, trimmed } = clean_nodes(
parent,
nodes,
context.path,
namespace,
context.state.preserve_whitespace,
context.state.options.preserveComments
);
if (hoisted.length === 0 && trimmed.length === 0) {
return [];
}
const is_single_element = trimmed.length === 1 && trimmed[0].type === 'RegularElement';
const is_single_child_not_needing_template =
trimmed.length === 1 &&
(trimmed[0].type === 'SvelteFragment' || trimmed[0].type === 'TitleElement');
const template_name = context.state.scope.root.unique(name);
/** @type {import('estree').Statement[]} */
const body = [];
/** @type {import('estree').Statement | undefined} */
let close = undefined;
/** @type {import('../types').ComponentClientTransformState} */
const state = {
...context.state,
before_init: [],
init: [],
update: [],
after_update: [],
template: [],
metadata: {
context: {
template_needs_import_node: false,
template_contains_script_tag: false
},
namespace,
bound_contenteditable: context.state.metadata.bound_contenteditable
}
};
for (const node of hoisted) {
context.visit(node, state);
}
if (is_single_element) {
const element = /** @type {import('#compiler').RegularElement} */ (trimmed[0]);
const id = b.id(context.state.scope.generate(element.name));
context.visit(element, {
...state,
node: id
});
/** @type {import('estree').Expression[]} */
const args = [b.template([b.quasi(state.template.join(''), true)], [])];
if (state.metadata.context.template_needs_import_node) {
args.push(b.literal(TEMPLATE_USE_IMPORT_NODE));
}
context.state.hoisted.push(
b.var(template_name, b.call(get_template_function(namespace, state), ...args))
);
body.push(b.var(id, b.call(template_name)), ...state.before_init, ...state.init);
close = b.stmt(b.call('$.append', b.id('$$anchor'), id));
} else if (is_single_child_not_needing_template) {
context.visit(trimmed[0], state);
body.push(...state.before_init, ...state.init);
} else if (trimmed.length > 0) {
const id = b.id(context.state.scope.generate('fragment'));
const use_space_template =
trimmed.some((node) => node.type === 'ExpressionTag') &&
trimmed.every((node) => node.type === 'Text' || node.type === 'ExpressionTag');
if (use_space_template) {
// special case — we can use `$.text` instead of creating a unique template
const id = b.id(context.state.scope.generate('text'));
process_children(trimmed, () => id, false, {
...context,
state
});
body.push(b.var(id, b.call('$.text', b.id('$$anchor'))), ...state.before_init, ...state.init);
close = b.stmt(b.call('$.append', b.id('$$anchor'), id));
} else {
/** @type {(is_text: boolean) => import('estree').Expression} */
const expression = (is_text) =>
is_text ? b.call('$.first_child', id, b.true) : b.call('$.first_child', id);
process_children(trimmed, expression, false, { ...context, state });
const use_comment_template = state.template.length === 1 && state.template[0] === '<!>';
if (use_comment_template) {
// special case — we can use `$.comment` instead of creating a unique template
body.push(b.var(id, b.call('$.comment')));
} else {
let flags = TEMPLATE_FRAGMENT;
if (state.metadata.context.template_needs_import_node) {
flags |= TEMPLATE_USE_IMPORT_NODE;
}
state.hoisted.push(
b.var(
template_name,
b.call(
get_template_function(namespace, state),
b.template([b.quasi(state.template.join(''), true)], []),
b.literal(flags)
)
)
);
body.push(b.var(id, b.call(template_name)));
}
body.push(...state.before_init, ...state.init);
close = b.stmt(b.call('$.append', b.id('$$anchor'), id));
}
} else {
body.push(...state.before_init, ...state.init);
}
if (state.update.length > 0) {
body.push(serialize_render_stmt(state));
}
body.push(...state.after_update);
if (close !== undefined) {
// It's important that close is the last statement in the block, as any previous statements
// could contain element insertions into the template, which the close statement needs to
// know of when constructing the list of current inner elements.
body.push(close);
}
return body;
}
/**
*
* @param {import('#compiler').Namespace} namespace
* @param {import('../types.js').ComponentClientTransformState} state
* @returns
*/
function get_template_function(namespace, state) {
const contains_script_tag = state.metadata.context.template_contains_script_tag;
return namespace === 'svg'
? contains_script_tag
? '$.svg_template_with_script'
: '$.svg_template'
: contains_script_tag
? '$.template_with_script'
: '$.template';
}
/**
*
* @param {import('estree').Statement} statement
*/
function serialize_update(statement) {
const body =
statement.type === 'ExpressionStatement' ? statement.expression : b.block([statement]);
return b.stmt(b.call('$.render_effect', b.thunk(body)));
}
/**
*
* @param {import('../types.js').ComponentClientTransformState} state
*/
function serialize_render_stmt(state) {
return state.update.length === 1
? serialize_update(state.update[0])
: b.stmt(b.call('$.render_effect', b.thunk(b.block(state.update))));
}
/**
* Serializes the event handler function of the `on:` directive
* @param {Pick<import('#compiler').OnDirective, 'name' | 'modifiers' | 'expression'>} node
* @param {import('../types.js').ComponentContext} context
*/
function serialize_event_handler(node, { state, visit }) {
if (node.expression) {
let handler = node.expression;
// Event handlers can be dynamic (source/store/prop/conditional etc)
const dynamic_handler = () =>
b.function(
null,
[b.rest(b.id('$$args'))],
b.block([
b.const('$$callback', /** @type {import('estree').Expression} */ (visit(handler))),
b.return(
b.call(b.member(b.id('$$callback'), b.id('apply'), false, true), b.this, b.id('$$args'))
)
])
);
if (handler.type === 'Identifier' || handler.type === 'MemberExpression') {
const id = object(handler);
const binding = id === null ? null : state.scope.get(id.name);
if (
binding !== null &&
(binding.kind === 'state' ||
binding.kind === 'frozen_state' ||
binding.declaration_kind === 'import' ||
binding.kind === 'legacy_reactive' ||
binding.kind === 'derived' ||
binding.kind === 'prop' ||
binding.kind === 'bindable_prop' ||
binding.kind === 'store_sub')
) {
handler = dynamic_handler();
} else {
handler = /** @type {import('estree').Expression} */ (visit(handler));
}
} else if (handler.type === 'ConditionalExpression' || handler.type === 'LogicalExpression') {
handler = dynamic_handler();
} else {
handler = /** @type {import('estree').Expression} */ (visit(handler));
}
if (node.modifiers.includes('stopPropagation')) {
handler = b.call('$.stopPropagation', handler);
}
if (node.modifiers.includes('stopImmediatePropagation')) {
handler = b.call('$.stopImmediatePropagation', handler);
}
if (node.modifiers.includes('preventDefault')) {
handler = b.call('$.preventDefault', handler);
}
if (node.modifiers.includes('self')) {
handler = b.call('$.self', handler);
}
if (node.modifiers.includes('trusted')) {
handler = b.call('$.trusted', handler);
}
return handler;
} else {
// Function + .call to preserve "this" context as much as possible
return b.function(
null,
[b.id('$$arg')],
b.block([b.stmt(b.call('$.bubble_event.call', b.this, b.id('$$props'), b.id('$$arg')))])
);
}
}
/**
* Serializes an event handler function of the `on:` directive or an attribute starting with `on`
* @param {{name: string; modifiers: string[]; expression: import('estree').Expression | null; delegated?: import('#compiler').DelegatedEvent | null; }} node
* @param {import('../types.js').ComponentContext} context
*/
function serialize_event(node, context) {
const state = context.state;
/** @type {import('estree').Statement} */
let statement;
if (node.expression) {
let handler = serialize_event_handler(node, context);
const event_name = node.name;
const delegated = node.delegated;
if (delegated != null) {
let delegated_assignment;
if (!state.events.has(event_name)) {
state.events.add(event_name);
}
// Hoist function if we can, otherwise we leave the function as is
if (delegated.type === 'hoistable') {
if (delegated.function === node.expression) {
const func_name = context.state.scope.root.unique('on_' + event_name);
state.hoisted.push(b.var(func_name, handler));
handler = func_name;
}
if (node.modifiers.includes('once')) {
handler = b.call('$.once', handler);
}
const hoistable_params = /** @type {import('estree').Expression[]} */ (
delegated.function.metadata.hoistable_params
);
// When we hoist a function we assign an array with the function and all
// hoisted closure params.
const args = [handler, ...hoistable_params];
delegated_assignment = b.array(args);
} else {
if (node.modifiers.includes('once')) {
handler = b.call('$.once', handler);
}
delegated_assignment = handler;
}
state.init.push(
b.stmt(
b.assignment(
'=',
b.member(context.state.node, b.id('__' + event_name)),
delegated_assignment
)
)
);
return;
}
if (node.modifiers.includes('once')) {
handler = b.call('$.once', handler);
}
const args = [
b.literal(event_name),
context.state.node,
handler,
b.literal(node.modifiers.includes('capture'))
];
if (node.modifiers.includes('passive')) {
args.push(b.literal(true));
} else if (node.modifiers.includes('nonpassive')) {
args.push(b.literal(false));
} else if (PassiveEvents.includes(node.name)) {
args.push(b.literal(true));
}
// Events need to run in order with bindings/actions
statement = b.stmt(b.call('$.event', ...args));
} else {
statement = b.stmt(
b.call('$.event', b.literal(node.name), state.node, serialize_event_handler(node, context))
);
}
const parent = /** @type {import('#compiler').SvelteNode} */ (context.path.at(-1));
if (parent.type === 'SvelteDocument' || parent.type === 'SvelteWindow') {
state.before_init.push(statement);
} else {
state.after_update.push(statement);
}
}
/**
* @param {import('#compiler').Attribute & { value: [import('#compiler').ExpressionTag] }} node
* @param {import('../types').ComponentContext} context
*/
function serialize_event_attribute(node, context) {
/** @type {string[]} */
const modifiers = [];
let event_name = node.name.slice(2);
if (
event_name.endsWith('capture') &&
event_name !== 'ongotpointercapture' &&
event_name !== 'onlostpointercapture'
) {
event_name = event_name.slice(0, -7);
modifiers.push('capture');
}
serialize_event(
{
name: event_name,
expression: node.value[0].expression,
modifiers,
delegated: node.metadata.delegated
},
context
);
}
/**
* Processes an array of template nodes, joining sibling text/expression nodes
* (e.g. `{a} b {c}`) into a single update function. Along the way it creates
* corresponding template node references these updates are applied to.
* @param {import('#compiler').SvelteNode[]} nodes
* @param {(is_text: boolean) => import('estree').Expression} expression
* @param {boolean} is_element
* @param {import('../types.js').ComponentContext} context
*/
function process_children(nodes, expression, is_element, { visit, state }) {
const within_bound_contenteditable = state.metadata.bound_contenteditable;
/** @typedef {Array<import('#compiler').Text | import('#compiler').ExpressionTag>} Sequence */
/** @type {Sequence} */
let sequence = [];
/**
* @param {Sequence} sequence
*/
function flush_sequence(sequence) {
if (sequence.length === 1) {
const node = sequence[0];
if (node.type === 'Text') {
let prev = expression;
expression = () => b.call('$.sibling', prev(true));
state.template.push(node.raw);
return;
}
state.template.push(' ');
const text_id = get_node_id(expression(true), state, 'text');
const update = b.stmt(
b.call(
'$.set_text',
text_id,
/** @type {import('estree').Expression} */ (visit(node.expression))
)
);
if (node.metadata.contains_call_expression && !within_bound_contenteditable) {
state.init.push(serialize_update(update));
} else if (node.metadata.dynamic && !within_bound_contenteditable) {
state.update.push(update);
} else {
state.init.push(
b.stmt(
b.assignment(
'=',
b.member(text_id, b.id('nodeValue')),
b.call(
'$.stringify',
/** @type {import('estree').Expression} */ (visit(node.expression))
)
)
)
);
}
expression = (is_text) =>
is_text ? b.call('$.sibling', text_id, b.true) : b.call('$.sibling', text_id);
} else {
const text_id = get_node_id(expression(true), state, 'text');
state.template.push(' ');
const [contains_call_expression, value] = serialize_template_literal(sequence, visit, state);
const update = b.stmt(b.call('$.set_text', text_id, value));
if (contains_call_expression && !within_bound_contenteditable) {
state.init.push(serialize_update(update));
} else if (
sequence.some((node) => node.type === 'ExpressionTag' && node.metadata.dynamic) &&
!within_bound_contenteditable
) {
state.update.push(update);
} else {
state.init.push(b.stmt(b.assignment('=', b.member(text_id, b.id('nodeValue')), value)));
}
expression = (is_text) =>
is_text ? b.call('$.sibling', text_id, b.true) : b.call('$.sibling', text_id);
}
}
for (let i = 0; i < nodes.length; i += 1) {
const node = nodes[i];
if (node.type === 'Text' || node.type === 'ExpressionTag') {
sequence.push(node);
} else {
if (sequence.length > 0) {
flush_sequence(sequence);
sequence = [];
}
if (
node.type === 'SvelteHead' ||
node.type === 'TitleElement' ||
node.type === 'SnippetBlock'
) {
// These nodes do not contribute to the sibling/child tree
// TODO what about e.g. ConstTag and all the other things that
// get hoisted inside clean_nodes?
visit(node, state);
} else {
if (node.type === 'EachBlock' && nodes.length === 1 && is_element) {
node.metadata.is_controlled = true;
visit(node, state);
} else {
const id = get_node_id(
expression(false),
state,
node.type === 'RegularElement' ? node.name : 'node'
);
expression = (is_text) =>
is_text ? b.call('$.sibling', id, b.true) : b.call('$.sibling', id);
visit(node, {
...state,
node: id
});
}
}
}
}
if (sequence.length > 0) {
flush_sequence(sequence);
}
}
/**
* @param {import('estree').Expression} expression
* @param {import('../types.js').ComponentClientTransformState} state
* @param {string} name
*/
function get_node_id(expression, state, name) {
let id = expression;
if (id.type !== 'Identifier') {
id = b.id(state.scope.generate(name));
state.init.push(b.var(id, expression));
}
return id;
}
/**
* @param {true | Array<import('#compiler').Text | import('#compiler').ExpressionTag>} attribute_value
* @param {import('../types').ComponentContext} context
* @returns {[boolean, import('estree').Expression]}
*/
function serialize_attribute_value(attribute_value, context) {
let contains_call_expression = false;
if (attribute_value === true) {
return [contains_call_expression, b.literal(true)];
}
if (attribute_value.length === 0) {
return [contains_call_expression, b.literal('')]; // is this even possible?
}
if (attribute_value.length === 1) {
const value = attribute_value[0];
if (value.type === 'Text') {
return [contains_call_expression, b.literal(value.data)];
} else {
if (value.type === 'ExpressionTag') {
contains_call_expression = value.metadata.contains_call_expression;
}
return [
contains_call_expression,
/** @type {import('estree').Expression} */ (context.visit(value.expression))
];
}
}
return serialize_template_literal(attribute_value, context.visit, context.state);
}
/**
* @param {Array<import('#compiler').Text | import('#compiler').ExpressionTag>} values
* @param {(node: import('#compiler').SvelteNode) => any} visit
* @param {import("../types.js").ComponentClientTransformState} state
* @returns {[boolean, import('estree').TemplateLiteral]}
*/
function serialize_template_literal(values, visit, state) {
/** @type {import('estree').TemplateElement[]} */
const quasis = [];
/** @type {import('estree').Expression[]} */
const expressions = [];
let contains_call_expression = false;
let contains_multiple_call_expression = false;
quasis.push(b.quasi(''));
for (let i = 0; i < values.length; i++) {
const node = values[i];
if (node.type === 'ExpressionTag' && node.metadata.contains_call_expression) {
if (contains_call_expression) {
contains_multiple_call_expression = true;
}
contains_call_expression = true;
}
}
for (let i = 0; i < values.length; i++) {
const node = values[i];
if (node.type === 'Text') {
const last = /** @type {import('estree').TemplateElement} */ (quasis.at(-1));
last.value.raw += sanitize_template_string(node.data);
} else if (node.type === 'ExpressionTag' && node.expression.type === 'Literal') {
const last = /** @type {import('estree').TemplateElement} */ (quasis.at(-1));
if (node.expression.value != null) {
last.value.raw += sanitize_template_string(node.expression.value + '');
}
} else {
if (contains_multiple_call_expression) {
const id = b.id(state.scope.generate('stringified_text'));
state.init.push(
b.const(
id,
b.call(
// In runes mode, we want things to be fine-grained - but not in legacy mode
state.analysis.runes ? '$.derived' : '$.derived_safe_equal',
b.thunk(/** @type {import('estree').Expression} */ (visit(node.expression)))
)
)
);
expressions.push(b.call('$.get', id));
} else {
expressions.push(b.call('$.stringify', visit(node.expression)));
}
quasis.push(b.quasi('', i + 1 === values.length));
}
}
// TODO instead of this tuple, return a `{ dynamic, complex, value }` object. will DRY stuff out
return [contains_call_expression, b.template(quasis, expressions)];
}
/** @type {import('../types').ComponentVisitors} */
export const template_visitors = {
Fragment(node, context) {
const body = create_block(node, 'root', node.nodes, context);
return b.block(body);
},
Comment(node, context) {
// We'll only get here if comments are not filtered out, which they are unless preserveComments is true
context.state.template.push(`<!--${node.data}-->`);
},
HtmlTag(node, context) {
context.state.template.push('<!>');
// push into init, so that bindings run afterwards, which might trigger another run and override hydration
context.state.init.push(
b.stmt(
b.call(
'$.html',
context.state.node,
b.thunk(/** @type {import('estree').Expression} */ (context.visit(node.expression))),
b.literal(context.state.metadata.namespace === 'svg')
)
)
);
},
ConstTag(node, { state, visit }) {
const declaration = node.declaration.declarations[0];
// TODO we can almost certainly share some code with $derived(...)
if (declaration.id.type === 'Identifier') {
state.init.push(
b.const(
declaration.id,
b.call(
// In runes mode, we want things to be fine-grained - but not in legacy mode
state.analysis.runes ? '$.derived' : '$.derived_safe_equal',
b.thunk(/** @type {import('estree').Expression} */ (visit(declaration.init)))
)
)
);
// we need to eagerly evaluate the expression in order to hit any
// 'Cannot access x before initialization' errors
if (state.options.dev) {
state.init.push(b.stmt(b.call('$.get', declaration.id)));
}
} else {
const identifiers = extract_identifiers(declaration.id);
const tmp = b.id(state.scope.generate('computed_const'));
// Make all identifiers that are declared within the following computed regular
// variables, as they are not signals in that context yet
for (const node of identifiers) {
const binding = /** @type {import('#compiler').Binding} */ (state.scope.get(node.name));
binding.expression = node;
}
// TODO optimise the simple `{ x } = y` case — we can just return `y`
// instead of destructuring it only to return a new object
const fn = b.arrow(
[],
b.block([
b.const(
/** @type {import('estree').Pattern} */ (visit(declaration.id)),
/** @type {import('estree').Expression} */ (visit(declaration.init))
),
b.return(b.object(identifiers.map((node) => b.prop('init', node, node))))
])
);
state.init.push(
// In runes mode, we want things to be fine-grained - but not in legacy mode
b.const(tmp, b.call(state.analysis.runes ? '$.derived' : '$.derived_safe_equal', fn))
);
// we need to eagerly evaluate the expression in order to hit any
// 'Cannot access x before initialization' errors
if (state.options.dev) {
state.init.push(b.stmt(b.call('$.get', tmp)));
}
for (const node of identifiers) {
const binding = /** @type {import('#compiler').Binding} */ (state.scope.get(node.name));
binding.expression = b.member(b.call('$.get', tmp), node);
}
}
},
DebugTag(node, { state, visit }) {
state.init.push(
b.stmt(
b.call(
'$.render_effect',
b.thunk(
b.block([
b.stmt(
b.call(
'console.log',
b.object(
node.identifiers.map((identifier) =>
b.prop(
'init',
identifier,
/** @type {import('estree').Expression} */ (visit(identifier))
)
)
)
)
),
b.debugger
])
)
)
)
);
},
RenderTag(node, context) {
context.state.template.push('<!>');
const callee = unwrap_optional(node.expression).callee;
const raw_args = unwrap_optional(node.expression).arguments;
const is_reactive =
callee.type !== 'Identifier' || context.state.scope.get(callee.name)?.kind !== 'normal';
/** @type {import('estree').Expression[]} */
const args = [context.state.node];
for (const arg of raw_args) {
args.push(b.thunk(/** @type {import('estree').Expression} */ (context.visit(arg))));
}
let snippet_function = /** @type {import('estree').Expression} */ (context.visit(callee));
if (context.state.options.dev) {
snippet_function = b.call('$.validate_snippet', snippet_function);
}
if (is_reactive) {
context.state.init.push(b.stmt(b.call('$.snippet', b.thunk(snippet_function), ...args)));
} else {
context.state.init.push(
b.stmt(
(node.expression.type === 'CallExpression' ? b.call : b.maybe_call)(
snippet_function,
...args
)
)
);
}
},
AnimateDirective(node, { state, visit }) {
const expression =
node.expression === null
? b.literal(null)
: b.thunk(/** @type {import('estree').Expression} */ (visit(node.expression)));
state.init.push(
b.stmt(
b.call(
'$.animation',
state.node,
b.thunk(
/** @type {import('estree').Expression} */ (visit(parse_directive_name(node.name)))
),
expression
)
)
);
},
ClassDirective(node, { state, next }) {
error(node, 'INTERNAL', 'Node should have been handled elsewhere');
},
StyleDirective(node, { state, next }) {
error(node, 'INTERNAL', 'Node should have been handled elsewhere');
},
TransitionDirective(node, { state, visit }) {
let flags = node.modifiers.includes('global') ? TRANSITION_GLOBAL : 0;
if (node.intro) flags |= TRANSITION_IN;
if (node.outro) flags |= TRANSITION_OUT;
const args = [
b.literal(flags),
state.node,
b.thunk(/** @type {import('estree').Expression} */ (visit(parse_directive_name(node.name))))
];
if (node.expression) {
args.push(b.thunk(/** @type {import('estree').Expression} */ (visit(node.expression))));
}
state.init.push(b.stmt(b.call('$.transition', ...args)));
},
RegularElement(node, context) {
if (node.name === 'noscript') {
context.state.template.push('<!>');
return;
}
if (node.name === 'script') {
context.state.metadata.context.template_contains_script_tag = true;
}
const metadata = context.state.metadata;
const child_metadata = {
...context.state.metadata,
namespace: determine_namespace_for_children(node, context.state.metadata.namespace)
};
context.state.template.push(`<${node.name}`);
/** @type {Array<import('#compiler').Attribute | import('#compiler').SpreadAttribute>} */
const attributes = [];
/** @type {import('#compiler').ClassDirective[]} */
const class_directives = [];
/** @type {import('#compiler').StyleDirective[]} */
const style_directives = [];
/** @type {import('estree').ExpressionStatement[]} */
const lets = [];
const is_custom_element = is_custom_element_node(node);
let needs_input_reset = false;
let needs_content_reset = false;
/** @type {import('#compiler').BindDirective | null} */
let value_binding = null;
/** If true, needs `__value` for inputs */
let needs_special_value_handling = node.name === 'option' || node.name === 'select';
let is_content_editable = false;
let has_content_editable_binding = false;
if (is_custom_element) {
// cloneNode is faster, but it does not instantiate the underlying class of the
// custom element until the template is connected to the dom, which would
// cause problems when setting properties on the custom element.
// Therefore we need to use importNode instead, which doesn't have this caveat.
metadata.context.template_needs_import_node = true;
}
for (const attribute of node.attributes) {
if (attribute.type === 'Attribute') {
attributes.push(attribute);
if (
(attribute.name === 'value' || attribute.name === 'checked') &&
!is_text_attribute(attribute)
) {
needs_input_reset = true;
needs_content_reset = true;
} else if (
attribute.name === 'contenteditable' &&
(attribute.value === true ||
(is_text_attribute(attribute) && attribute.value[0].data === 'true'))
) {
is_content_editable = true;
}
} else if (attribute.type === 'SpreadAttribute') {
attributes.push(attribute);
needs_input_reset = true;
needs_content_reset = true;
} else if (attribute.type === 'ClassDirective') {
class_directives.push(attribute);
} else if (attribute.type === 'StyleDirective') {
style_directives.push(attribute);
} else if (attribute.type === 'LetDirective') {
lets.push(/** @type {import('estree').ExpressionStatement} */ (context.visit(attribute)));
} else {
if (attribute.type === 'BindDirective') {
if (attribute.name === 'group' || attribute.name === 'checked') {
needs_special_value_handling = true;
needs_input_reset = true;
} else if (attribute.name === 'value') {
value_binding = attribute;
needs_content_reset = true;
needs_input_reset = true;
} else if (
attribute.name === 'innerHTML' ||
attribute.name === 'innerText' ||
attribute.name === 'textContent'
) {
has_content_editable_binding = true;
}
}
context.visit(attribute);
}
}
if (child_metadata.namespace === 'foreign') {
// input/select etc could mean something completely different in foreign namespace, so don't special-case them
needs_content_reset = false;
needs_input_reset = false;
needs_special_value_handling = false;
value_binding = null;
}
if (is_content_editable && has_content_editable_binding) {
child_metadata.bound_contenteditable = true;
}
if (needs_input_reset && (node.name === 'input' || node.name === 'select')) {
context.state.init.push(b.stmt(b.call('$.remove_input_attr_defaults', context.state.node)));
}
if (needs_content_reset && node.name === 'textarea') {
context.state.init.push(b.stmt(b.call('$.remove_textarea_child', context.state.node)));
}
if (value_binding !== null && node.name === 'select') {
setup_select_synchronization(value_binding, context);
}
const node_id = context.state.node;
// Let bindings first, they can be used on attributes
context.state.init.push(...lets);
// Then do attributes
let is_attributes_reactive = false;
if (node.metadata.has_spread) {
serialize_element_spread_attributes(
attributes,
context,
node,
node_id,
// If value binding exists, that one takes care of calling $.init_select
value_binding === null && node.name === 'select' && child_metadata.namespace !== 'foreign'
);
is_attributes_reactive = true;
} else {
for (const attribute of /** @type {import('#compiler').Attribute[]} */ (attributes)) {
if (is_event_attribute(attribute)) {
serialize_event_attribute(attribute, context);
continue;
}
if (needs_special_value_handling && attribute.name === 'value') {
serialize_element_special_value_attribute(node.name, node_id, attribute, context);
continue;
}
if (
attribute.name !== 'autofocus' &&
(attribute.value === true || is_text_attribute(attribute))
) {
const name = get_attribute_name(node, attribute, context);
const literal_value = /** @type {import('estree').Literal} */ (
serialize_attribute_value(attribute.value, context)[1]
).value;
if (name !== 'class' || literal_value) {
// TODO namespace=foreign probably doesn't want to do template stuff at all and instead use programmatic methods
// to create the elements it needs.
context.state.template.push(
` ${attribute.name}${
DOMBooleanAttributes.includes(name) && literal_value === true
? ''
: `="${literal_value === true ? '' : escape_html(String(literal_value), true)}"`
}`
);
continue;
}
}
const is =
is_custom_element && child_metadata.namespace !== 'foreign'
? serialize_custom_element_attribute_update_assignment(node_id, attribute, context)
: serialize_element_attribute_update_assignment(node, node_id, attribute, context);
if (is) is_attributes_reactive = true;
}
}
// class/style directives must be applied last since they could override class/style attributes
serialize_class_directives(class_directives, node_id, context, is_attributes_reactive);
serialize_style_directives(style_directives, node_id, context, is_attributes_reactive);
context.state.template.push('>');
/** @type {import('../types').ComponentClientTransformState} */
const state = {
...context.state,
metadata: child_metadata,
scope: /** @type {import('../../../scope').Scope} */ (
context.state.scopes.get(node.fragment)
),
preserve_whitespace:
context.state.preserve_whitespace ||
((node.name === 'pre' || node.name === 'textarea') &&
child_metadata.namespace !== 'foreign')
};
const { hoisted, trimmed } = clean_nodes(
node,
node.fragment.nodes,
context.path,
child_metadata.namespace,
node.name === 'script' || state.preserve_whitespace,
state.options.preserveComments
);
for (const node of hoisted) {
context.visit(node, state);
}
process_children(
trimmed,
() =>
b.call(
'$.child',
node.name === 'template'
? b.member(context.state.node, b.id('content'))
: context.state.node
),
true,
{ ...context, state }
);
if (!VoidElements.includes(node.name)) {
context.state.template.push(`</${node.name}>`);
}
},
SvelteElement(node, context) {
context.state.template.push(`<!>`);
/** @type {Array<import('#compiler').Attribute | import('#compiler').SpreadAttribute>} */
const attributes = [];
/** @type {import('#compiler').ClassDirective[]} */
const class_directives = [];
/** @type {import('#compiler').StyleDirective[]} */
const style_directives = [];
/** @type {import('estree').ExpressionStatement[]} */
const lets = [];
// Create a temporary context which picks up the init/update statements.
// They'll then be added to the function parameter of $.element
const element_id = b.id(context.state.scope.generate('$$element'));
/** @type {import('../types').ComponentContext} */
const inner_context = {
...context,
state: {
...context.state,
node: element_id,
before_init: [],
init: [],
update: [],
after_update: []
}
};
for (const attribute of node.attributes) {
if (attribute.type === 'Attribute') {
attributes.push(attribute);
} else if (attribute.type === 'SpreadAttribute') {
attributes.push(attribute);
} else if (attribute.type === 'ClassDirective') {
class_directives.push(attribute);
} else if (attribute.type === 'StyleDirective') {
style_directives.push(attribute);
} else if (attribute.type === 'LetDirective') {
lets.push(/** @type {import('estree').ExpressionStatement} */ (context.visit(attribute)));
} else {
context.visit(attribute, inner_context.state);
}
}
// Let bindings first, they can be used on attributes
context.state.init.push(...lets); // create computeds in the outer context; the dynamic element is the single child of this slot
// Then do attributes
// Always use spread because we don't know whether the element is a custom element or not,
// therefore we need to do the "how to set an attribute" logic at runtime.
const is_attributes_reactive =
serialize_dynamic_element_attributes(attributes, inner_context, element_id) !== null;
// class/style directives must be applied last since they could override class/style attributes
serialize_class_directives(class_directives, element_id, inner_context, is_attributes_reactive);
serialize_style_directives(style_directives, element_id, inner_context, is_attributes_reactive);
const get_tag = b.thunk(/** @type {import('estree').Expression} */ (context.visit(node.tag)));
if (context.state.options.dev && context.state.metadata.namespace !== 'foreign') {
if (node.fragment.nodes.length > 0) {
context.state.init.push(b.stmt(b.call('$.validate_void_dynamic_element', get_tag)));
}
context.state.init.push(b.stmt(b.call('$.validate_dynamic_element_tag', get_tag)));
}
/** @type {import('estree').Statement[]} */
const inner = inner_context.state.init;
if (inner_context.state.update.length > 0) {
inner.push(serialize_render_stmt(inner_context.state));
}
inner.push(...inner_context.state.after_update);
inner.push(
...create_block(node, 'dynamic_element', node.fragment.nodes, {
...context,
state: {
...context.state,
metadata: {
...context.state.metadata,
namespace: determine_namespace_for_children(node, context.state.metadata.namespace)
}
}
})
);
context.state.init.push(
b.stmt(
b.call(
'$.element',
context.state.node,
get_tag,
node.metadata.svg === true
? b.true
: node.metadata.svg === false
? b.false
: b.literal(null),
inner.length === 0
? /** @type {any} */ (undefined)
: b.arrow([element_id, b.id('$$anchor')], b.block(inner))
)
)
);
},
EachBlock(node, context) {
const each_node_meta = node.metadata;
const collection = /** @type {import('estree').Expression} */ (context.visit(node.expression));
let each_item_is_reactive = true;
if (!each_node_meta.is_controlled) {
context.state.template.push('<!>');
}
if (each_node_meta.array_name !== null) {
context.state.init.push(b.const(each_node_meta.array_name, b.thunk(collection)));
}
// The runtime needs to know what kind of each block this is in order to optimize for the
// key === item (we avoid extra allocations). In that case, the item doesn't need to be reactive.
// We can guarantee this by knowing that in order for the item of the each block to change, they
// would need to mutate the key/item directly in the array. Given that in runes mode we use ===
// equality, we can apply a fast-path (as long as the index isn't reactive).
let each_type = 0;
if (
node.key &&
(node.key.type !== 'Identifier' || !node.index || node.key.name !== node.index)
) {
each_type |= EACH_KEYED;
// If there's a destructuring, then we likely need the generated $$index
if (node.index || node.context.type !== 'Identifier') {
each_type |= EACH_INDEX_REACTIVE;
}
if (
context.state.analysis.runes &&
node.key.type === 'Identifier' &&
node.context.type === 'Identifier' &&
node.context.name === node.key.name &&
(each_type & EACH_INDEX_REACTIVE) === 0
) {
// Fast-path for when the key === item
each_item_is_reactive = false;
} else {
each_type |= EACH_ITEM_REACTIVE;
}
} else {
each_type |= EACH_ITEM_REACTIVE;
}
// Since `animate:` can only appear on elements that are the sole child of a keyed each block,
// we can determine at compile time whether the each block is animated or not (in which
// case it should measure animated elements before and after reconciliation).
if (
node.key &&
node.body.nodes.some((child) => {
if (child.type !== 'RegularElement' && child.type !== 'SvelteElement') return false;
return child.attributes.some((attr) => attr.type === 'AnimateDirective');
})
) {
each_type |= EACH_IS_ANIMATED;
}
if (each_node_meta.is_controlled) {
each_type |= EACH_IS_CONTROLLED;
}
if (context.state.analysis.runes) {
each_type |= EACH_IS_STRICT_EQUALS;
}
// If the array is a store expression, we need to invalidate it when the array is changed.
// This doesn't catch all cases, but all the ones that Svelte 4 catches, too.
let store_to_invalidate = '';
if (node.expression.type === 'Identifier' || node.expression.type === 'MemberExpression') {
const id = object(node.expression);
if (id) {
const binding = context.state.scope.get(id.name);
if (binding?.kind === 'store_sub') {
store_to_invalidate = id.name;
}
}
}
// Legacy mode: find the parent each blocks which contain the arrays to invalidate
const indirect_dependencies = collect_parent_each_blocks(context).flatMap((block) => {
const array = /** @type {import('estree').Expression} */ (context.visit(block.expression));
const transitive_dependencies = serialize_transitive_dependencies(
block.metadata.references,
context
);
return [array, ...transitive_dependencies];
});
if (each_node_meta.array_name) {
indirect_dependencies.push(b.call(each_node_meta.array_name));
} else {
indirect_dependencies.push(collection);
const transitive_dependencies = serialize_transitive_dependencies(
each_node_meta.references,
context
);
indirect_dependencies.push(...transitive_dependencies);
}
/**
* @param {import('estree').Pattern} expression_for_id
* @returns {import('#compiler').Binding['mutation']}
*/
const create_mutation = (expression_for_id) => {
return (assignment, context) => {
if (assignment.left.type !== 'Identifier' && assignment.left.type !== 'MemberExpression') {
// serialize_set_binding turns other patterns into IIFEs and separates the assignments
// into separate expressions, at which point this is called again with an identifier or member expression
return serialize_set_binding(assignment, context, () => assignment);
}
const left = object(assignment.left);
const value = get_assignment_value(assignment, context);
const invalidate = b.call(
'$.invalidate_inner_signals',
b.thunk(b.sequence(indirect_dependencies))
);
const invalidate_store = store_to_invalidate
? b.call('$.invalidate_store', b.id('$$subscriptions'), b.literal(store_to_invalidate))
: undefined;
const sequence = [];
if (!context.state.analysis.runes) sequence.push(invalidate);
if (invalidate_store) sequence.push(invalidate_store);
if (left === assignment.left) {
const assign = b.assignment('=', expression_for_id, value);
sequence.unshift(assign);
return b.sequence(sequence);
} else {
const original_left = /** @type {import('estree').MemberExpression} */ (assignment.left);
const left = context.visit(original_left);
const assign = b.assignment(assignment.operator, left, value);
sequence.unshift(assign);
return b.sequence(sequence);
}
};
};
// We need to generate a unique identifier in case there's a bind:group below
// which needs a reference to the index
const index =
each_node_meta.contains_group_binding || !node.index
? each_node_meta.index
: b.id(node.index);
const item = each_node_meta.item;
const binding = /** @type {import('#compiler').Binding} */ (context.state.scope.get(item.name));
binding.expression = (id) => {
const item_with_loc = with_loc(item, id);
return b.call('$.unwrap', item_with_loc);
};
if (node.index) {
const index_binding = /** @type {import('#compiler').Binding} */ (
context.state.scope.get(node.index)
);
index_binding.expression = (id) => {
const index_with_loc = with_loc(index, id);
return b.call('$.unwrap', index_with_loc);
};
}
/** @type {import('estree').Statement[]} */
const declarations = [];
if (node.context.type === 'Identifier') {
binding.mutation = create_mutation(
b.member(
each_node_meta.array_name ? b.call(each_node_meta.array_name) : collection,
index,
true
)
);
} else {
const unwrapped = binding.expression(binding.node);
const paths = extract_paths(node.context);
for (const path of paths) {
const name = /** @type {import('estree').Identifier} */ (path.node).name;
const binding = /** @type {import('#compiler').Binding} */ (context.state.scope.get(name));
const needs_derived = path.has_default_value; // to ensure that default value is only called once
const fn = b.thunk(
/** @type {import('estree').Expression} */ (context.visit(path.expression?.(unwrapped)))
);
declarations.push(
b.let(path.node, needs_derived ? b.call('$.derived_safe_equal', fn) : fn)
);
binding.expression = needs_derived ? b.call('$.get', b.id(name)) : b.call(name);
binding.mutation = create_mutation(
/** @type {import('estree').Pattern} */ (path.update_expression(unwrapped))
);
// we need to eagerly evaluate the expression in order to hit any
// 'Cannot access x before initialization' errors
if (context.state.options.dev) {
declarations.push(b.stmt(binding.expression));
}
}
}
// TODO should use context.visit?
const children = create_block(node, 'each_block', node.body.nodes, context);
const key_function = node.key
? b.arrow(
[node.context.type === 'Identifier' ? node.context : b.id('$$item'), index],
declarations.length > 0
? b.block(
declarations.concat(
b.return(/** @type {import('estree').Expression} */ (context.visit(node.key)))
)
)
: /** @type {import('estree').Expression} */ (context.visit(node.key))
)
: b.id('$.index');
if (node.index && each_node_meta.contains_group_binding) {
// We needed to create a unique identifier for the index above, but we want to use the
// original index name in the template, therefore create another binding
declarations.push(b.let(node.index, index));
}
if (context.state.options.dev && (each_type & EACH_KEYED) !== 0) {
context.state.init.push(
b.stmt(b.call('$.validate_each_keys', b.thunk(collection), key_function))
);
}
/** @type {import('estree').Expression[]} */
const args = [
context.state.node,
b.literal(each_type),
each_node_meta.array_name ? each_node_meta.array_name : b.thunk(collection),
key_function,
b.arrow([b.id('$$anchor'), item, index], b.block(declarations.concat(children)))
];
if (node.fallback) {
args.push(
b.arrow(
[b.id('$$anchor')],
/** @type {import('estree').BlockStatement} */ (context.visit(node.fallback))
)
);
}
context.state.init.push(b.stmt(b.call('$.each', ...args)));
},
IfBlock(node, context) {
context.state.template.push('<!>');
const consequent = /** @type {import('estree').BlockStatement} */ (
context.visit(node.consequent)
);
const args = [
context.state.node,
b.thunk(/** @type {import('estree').Expression} */ (context.visit(node.test))),
b.arrow([b.id('$$anchor')], consequent)
];
if (node.alternate || node.elseif) {
args.push(
node.alternate
? b.arrow(
[b.id('$$anchor')],
/** @type {import('estree').BlockStatement} */ (context.visit(node.alternate))
)
: b.literal(null)
);
}
if (node.elseif) {
// We treat this...
//
// {#if x}
// ...
// {:else}
// {#if y}
// <div transition:foo>...</div>
// {/if}
// {/if}
//
// ...slightly differently to this...
//
// {#if x}
// ...
// {:else if y}
// <div transition:foo>...</div>
// {/if}
//
// ...even though they're logically equivalent. In the first case, the
// transition will only play when `y` changes, but in the second it
// should play when `x` or `y` change — both are considered 'local'
args.push(b.literal(true));
}
context.state.init.push(b.stmt(b.call('$.if', ...args)));
},
AwaitBlock(node, context) {
context.state.template.push('<!>');
context.state.init.push(
b.stmt(
b.call(
'$.await',
context.state.node,
b.thunk(/** @type {import('estree').Expression} */ (context.visit(node.expression))),
node.pending
? b.arrow(
[b.id('$$anchor')],
/** @type {import('estree').BlockStatement} */ (context.visit(node.pending))
)
: b.literal(null),
node.then
? b.arrow(
node.value
? [
b.id('$$anchor'),
/** @type {import('estree').Pattern} */ (context.visit(node.value))
]
: [b.id('$$anchor')],
/** @type {import('estree').BlockStatement} */ (context.visit(node.then))
)
: b.literal(null),
node.catch
? b.arrow(
node.error
? [
b.id('$$anchor'),
/** @type {import('estree').Pattern} */ (context.visit(node.error))
]
: [b.id('$$anchor')],
/** @type {import('estree').BlockStatement} */ (context.visit(node.catch))
)
: b.literal(null)
)
)
);
},
KeyBlock(node, context) {
context.state.template.push('<!>');
const key = /** @type {import('estree').Expression} */ (context.visit(node.expression));
const body = /** @type {import('estree').Expression} */ (context.visit(node.fragment));
context.state.init.push(
b.stmt(b.call('$.key', context.state.node, b.thunk(key), b.arrow([b.id('$$anchor')], body)))
);
},
SnippetBlock(node, context) {
// TODO hoist where possible
/** @type {import('estree').Pattern[]} */
const args = [b.id('$$anchor')];
/** @type {import('estree').BlockStatement} */
let body;
/** @type {import('estree').Statement[]} */
const declarations = [];
for (let i = 0; i < node.parameters.length; i++) {
const argument = node.parameters[i];
if (!argument) continue;
if (argument.type === 'Identifier') {
args.push({
type: 'AssignmentPattern',
left: argument,
right: b.id('$.noop')
});
const binding = /** @type {import('#compiler').Binding} */ (
context.state.scope.get(argument.name)
);
binding.expression = b.call(argument);
continue;
}
let arg_alias = `$$arg${i}`;
args.push(b.id(arg_alias));
const paths = extract_paths(argument);
for (const path of paths) {
const name = /** @type {import('estree').Identifier} */ (path.node).name;
const binding = /** @type {import('#compiler').Binding} */ (context.state.scope.get(name));
const needs_derived = path.has_default_value; // to ensure that default value is only called once
const fn = b.thunk(
/** @type {import('estree').Expression} */ (
context.visit(path.expression?.(b.maybe_call(b.id(arg_alias))))
)
);
declarations.push(
b.let(path.node, needs_derived ? b.call('$.derived_safe_equal', fn) : fn)
);
binding.expression = needs_derived ? b.call('$.get', b.id(name)) : b.call(name);
// we need to eagerly evaluate the expression in order to hit any
// 'Cannot access x before initialization' errors
if (context.state.options.dev) {
declarations.push(b.stmt(binding.expression));
}
}
}
body = b.block([
...declarations,
.../** @type {import('estree').BlockStatement} */ (context.visit(node.body)).body
]);
const path = context.path;
// If we're top-level, then we can create a function for the snippet so that it can be referenced
// in the props declaration (default value pattern).
if (path.length === 1 && path[0].type === 'Fragment') {
context.state.init.push(b.function_declaration(node.expression, args, body));
} else {
context.state.init.push(b.const(node.expression, b.arrow(args, body)));
}
if (context.state.options.dev) {
context.state.init.push(b.stmt(b.call('$.add_snippet_symbol', node.expression)));
}
},
FunctionExpression: function_visitor,
ArrowFunctionExpression: function_visitor,
FunctionDeclaration(node, context) {
context.next({ ...context.state, in_constructor: false });
},
OnDirective(node, context) {
serialize_event(node, context);
},
UseDirective(node, { state, next, visit }) {
const params = [b.id('$$node')];
if (node.expression) {
params.push(b.id('$$action_arg'));
}
/** @type {import('estree').Expression[]} */
const args = [
state.node,
b.arrow(
params,
b.call(
/** @type {import('estree').Expression} */ (visit(parse_directive_name(node.name))),
...params
)
)
];
if (node.expression) {
args.push(b.thunk(/** @type {import('estree').Expression} */ (visit(node.expression))));
}
// actions need to run after attribute updates in order with bindings/events
state.after_update.push(b.stmt(b.call('$.action', ...args)));
next();
},
BindDirective(node, context) {
const { state, path, visit } = context;
const expression = node.expression;
const getter = b.thunk(/** @type {import('estree').Expression} */ (visit(expression)));
const assignment = b.assignment('=', expression, b.id('$$value'));
const setter = b.arrow(
[b.id('$$value')],
serialize_set_binding(
assignment,
context,
() => /** @type {import('estree').Expression} */ (visit(assignment)),
{
skip_proxy_and_freeze: true
}
)
);
/** @type {import('estree').CallExpression} */
let call_expr;
const property = binding_properties[node.name];
if (property && property.event) {
call_expr = b.call(
'$.bind_property',
b.literal(node.name),
b.literal(property.event),
b.literal(property.type ?? 'get'),
state.node,
getter,
setter
);
} else {
// special cases
switch (node.name) {
// window
case 'online':
call_expr = b.call(`$.bind_online`, setter);
break;
case 'scrollX':
case 'scrollY':
call_expr = b.call(
'$.bind_window_scroll',
b.literal(node.name === 'scrollX' ? 'x' : 'y'),
getter,
setter
);
break;
case 'innerWidth':
case 'innerHeight':
case 'outerWidth':
case 'outerHeight':
call_expr = b.call('$.bind_window_size', b.literal(node.name), setter);
break;
// media
case 'muted':
call_expr = b.call(`$.bind_muted`, state.node, getter, setter);
break;
case 'paused':
call_expr = b.call(`$.bind_paused`, state.node, getter, setter);
break;
case 'volume':
call_expr = b.call(`$.bind_volume`, state.node, getter, setter);
break;
case 'playbackRate':
call_expr = b.call(`$.bind_playback_rate`, state.node, getter, setter);
break;
case 'currentTime':
call_expr = b.call(`$.bind_current_time`, state.node, getter, setter);
break;
case 'buffered':
call_expr = b.call(`$.bind_buffered`, state.node, setter);
break;
case 'played':
call_expr = b.call(`$.bind_played`, state.node, setter);
break;
case 'seekable':
call_expr = b.call(`$.bind_seekable`, state.node, setter);
break;
case 'seeking':
call_expr = b.call(`$.bind_seeking`, state.node, setter);
break;
case 'ended':
call_expr = b.call(`$.bind_ended`, state.node, setter);
break;
case 'readyState':
call_expr = b.call(`$.bind_ready_state`, state.node, setter);
break;
// dimensions
case 'contentRect':
case 'contentBoxSize':
case 'borderBoxSize':
case 'devicePixelContentBoxSize':
call_expr = b.call('$.bind_resize_observer', state.node, b.literal(node.name), setter);
break;
case 'clientWidth':
case 'clientHeight':
case 'offsetWidth':
case 'offsetHeight':
call_expr = b.call('$.bind_element_size', state.node, b.literal(node.name), setter);
break;
// various
case 'value': {
const parent = path.at(-1);
if (parent?.type === 'RegularElement' && parent.name === 'select') {
call_expr = b.call(`$.bind_select_value`, state.node, getter, setter);
} else {
call_expr = b.call(`$.bind_value`, state.node, getter, setter);
}
break;
}
case 'files':
call_expr = b.call(`$.bind_files`, state.node, getter, setter);
break;
case 'this':
call_expr = serialize_bind_this(node.expression, context, state.node);
break;
case 'textContent':
case 'innerHTML':
case 'innerText':
call_expr = b.call(
'$.bind_content_editable',
b.literal(node.name),
state.node,
getter,
setter
);
break;
// checkbox/radio
case 'checked':
call_expr = b.call(`$.bind_checked`, state.node, getter, setter);
break;
case 'group': {
/** @type {import('estree').CallExpression[]} */
const indexes = [];
for (const parent_each_block of node.metadata.parent_each_blocks) {
indexes.push(b.call('$.unwrap', parent_each_block.metadata.index));
}
// We need to additionally invoke the value attribute signal to register it as a dependency,
// so that when the value is updated, the group binding is updated
let group_getter = getter;
const parent = path.at(-1);
if (parent?.type === 'RegularElement') {
const value = /** @type {any[]} */ (
/** @type {import('#compiler').Attribute} */ (
parent.attributes.find(
(a) =>
a.type === 'Attribute' &&
a.name === 'value' &&
!is_text_attribute(a) &&
a.value !== true
)
)?.value
);
if (value !== undefined) {
group_getter = b.thunk(
b.block([
b.stmt(serialize_attribute_value(value, context)[1]),
b.return(/** @type {import('estree').Expression} */ (visit(expression)))
])
);
}
}
call_expr = b.call(
'$.bind_group',
node.metadata.binding_group_name,
b.array(indexes),
state.node,
group_getter,
setter
);
break;
}
default:
error(node, 'INTERNAL', 'unknown binding ' + node.name);
}
}
// Bindings need to happen after attribute updates, therefore after the render effect, and in order with events/actions.
// bind:this is a special case as it's one-way and could influence the render effect.
if (node.name === 'this') {
state.init.push(b.stmt(call_expr));
} else {
state.after_update.push(b.stmt(call_expr));
}
},
Component(node, context) {
context.state.template.push('<!>');
const binding = context.state.scope.get(
node.name.includes('.') ? node.name.slice(0, node.name.indexOf('.')) : node.name
);
if (binding !== null && binding.kind !== 'normal') {
// Handle dynamic references to what seems like static inline components
const component = serialize_inline_component(node, '$$component', context);
context.state.init.push(
b.stmt(
b.call(
'$.component',
context.state.node,
// TODO use untrack here to not update when binding changes?
// Would align with Svelte 4 behavior, but it's arguably nicer/expected to update this
b.thunk(
/** @type {import('estree').Expression} */ (context.visit(b.member_id(node.name)))
),
b.arrow([b.id('$$component')], b.block([component]))
)
)
);
return;
}
const component = serialize_inline_component(node, node.name, context);
context.state.init.push(component);
},
SvelteSelf(node, context) {
context.state.template.push('<!>');
const component = serialize_inline_component(node, context.state.analysis.name, context);
context.state.init.push(component);
},
SvelteComponent(node, context) {
context.state.template.push('<!>');
let component = serialize_inline_component(node, '$$component', context);
if (context.state.options.dev) {
component = b.stmt(b.call('$.validate_dynamic_component', b.thunk(b.block([component]))));
}
context.state.init.push(
b.stmt(
b.call(
'$.component',
context.state.node,
b.thunk(/** @type {import('estree').Expression} */ (context.visit(node.expression))),
b.arrow([b.id('$$component')], b.block([component]))
)
)
);
},
Attribute(node, context) {
if (is_event_attribute(node)) {
serialize_event_attribute(node, context);
}
},
LetDirective(node, { state }) {
// let:x --> const x = $.derived(() => $$slotProps.x);
// let:x={{y, z}} --> const derived_x = $.derived(() => { const { y, z } = $$slotProps.x; return { y, z }));
if (node.expression && node.expression.type !== 'Identifier') {
const name = state.scope.generate(node.name);
const bindings = state.scope.get_bindings(node);
for (const binding of bindings) {
binding.expression = b.member(b.call('$.get', b.id(name)), b.id(binding.node.name));
}
return b.const(
name,
b.call(
'$.derived',
b.thunk(
b.block([
b.let(
/** @type {import('estree').Expression} */ (node.expression).type ===
'ObjectExpression'
? // @ts-expect-error types don't match, but it can't contain spread elements and the structure is otherwise fine
b.object_pattern(node.expression.properties)
: // @ts-expect-error types don't match, but it can't contain spread elements and the structure is otherwise fine
b.array_pattern(node.expression.elements),
b.member(b.id('$$slotProps'), b.id(node.name))
),
b.return(b.object(bindings.map((binding) => b.init(binding.node.name, binding.node))))
])
)
)
);
} else {
const name = node.expression === null ? node.name : node.expression.name;
return b.const(
name,
b.call(
// in legacy mode, sources can be mutated but they're not fine-grained.
// Using the safe-equal derived version ensures the slot is still updated
state.analysis.runes ? '$.derived' : '$.derived_safe_equal',
b.thunk(b.member(b.id('$$slotProps'), b.id(node.name)))
)
);
}
},
SpreadAttribute(node, { visit }) {
return visit(node.expression);
},
SvelteFragment(node, context) {
/** @type {import('estree').Statement[]} */
const lets = [];
for (const attribute of node.attributes) {
if (attribute.type === 'LetDirective') {
lets.push(/** @type {import('estree').ExpressionStatement} */ (context.visit(attribute)));
}
}
const state = {
...context.state,
// TODO this logic eventually belongs in create_block, when fragments are used everywhere
scope: /** @type {import('../../../scope').Scope} */ (context.state.scopes.get(node.fragment))
};
context.state.init.push(...lets);
context.state.init.push(
...create_block(
node,
'slot_template',
/** @type {import('#compiler').SvelteNode[]} */ (node.fragment.nodes),
{
...context,
state
}
)
);
},
SlotElement(node, context) {
// <slot {a}>fallback</slot> --> $.slot($$slots.default, { get a() { .. } }, () => ...fallback);
context.state.template.push('<!>');
/** @type {import('estree').Property[]} */
const props = [];
/** @type {import('estree').Expression[]} */
const spreads = [];
/** @type {import('estree').ExpressionStatement[]} */
const lets = [];
let is_default = true;
/** @type {import('estree').Expression} */
let name = b.literal('default');
for (const attribute of node.attributes) {
if (attribute.type === 'SpreadAttribute') {
spreads.push(
b.thunk(/** @type {import('estree').Expression} */ (context.visit(attribute)))
);
} else if (attribute.type === 'Attribute') {
const [, value] = serialize_attribute_value(attribute.value, context);
if (attribute.name === 'name') {
name = value;
is_default = false;
} else if (attribute.name !== 'slot') {
if (attribute.metadata.dynamic) {
props.push(b.get(attribute.name, [b.return(value)]));
} else {
props.push(b.init(attribute.name, value));
}
}
} else if (attribute.type === 'LetDirective') {
lets.push(/** @type {import('estree').ExpressionStatement} */ (context.visit(attribute)));
}
}
// Let bindings first, they can be used on attributes
context.state.init.push(...lets);
const props_expression =
spreads.length === 0
? b.object(props)
: b.call('$.spread_props', b.object(props), ...spreads);
const fallback =
node.fragment.nodes.length === 0
? b.literal(null)
: b.arrow(
[b.id('$$anchor')],
b.block(create_block(node, 'fallback', node.fragment.nodes, context))
);
const expression = is_default
? b.member(b.id('$$props'), b.id('children'))
: b.member(b.member(b.id('$$props'), b.id('$$slots')), name, true, true);
const slot = b.call('$.slot', context.state.node, expression, props_expression, fallback);
context.state.init.push(b.stmt(slot));
},
SvelteHead(node, context) {
// TODO attributes?
context.state.init.push(
b.stmt(
b.call(
'$.head',
b.arrow(
[b.id('$$anchor')],
b.block(create_block(node, 'head', node.fragment.nodes, context))
)
)
)
);
},
TitleElement(node, { state, visit }) {
// TODO throw validation error when attributes present / when children something else than text/expression tags
if (node.fragment.nodes.length === 1 && node.fragment.nodes[0].type === 'Text') {
state.init.push(
b.stmt(
b.assignment(
'=',
b.member(b.id('$.document'), b.id('title')),
b.literal(/** @type {import('#compiler').Text} */ (node.fragment.nodes[0]).data)
)
)
);
} else {
state.update.push(
b.stmt(
b.assignment(
'=',
b.member(b.id('$.document'), b.id('title')),
serialize_template_literal(/** @type {any} */ (node.fragment.nodes), visit, state)[1]
)
)
);
}
},
SvelteBody(node, context) {
context.next({
...context.state,
node: b.id('$.document.body')
});
},
SvelteWindow(node, context) {
context.next({
...context.state,
node: b.id('$.window')
});
},
SvelteDocument(node, context) {
context.next({
...context.state,
node: b.id('$.document')
});
},
CallExpression: javascript_visitors_runes.CallExpression,
VariableDeclaration: javascript_visitors_runes.VariableDeclaration
};
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