Press n or j to go to the next uncovered block, b, p or k for the previous block.
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1750x 1056x 1056x 694x 694x 694x 694x 694x 694x 48x 48x 48x 2x 2x 2x 2x 2x 2x 2x 822x 822x 822x 822x 822x 822x 822x 822x 822x 822x 822x 2774x 2774x 2774x 74x 12x 12x 74x 74x 2774x 822x 822x 2774x 2774x 2774x 1205x 1205x 2771x 9x 9x 9x 9x 1569x 1560x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 1560x 1540x 1540x 1560x 1560x 2774x 822x 822x 822x 822x 2x 2x 2x 2x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 171x 171x 3670x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 3842x 213x 213x 3670x 3670x 3670x 3670x 3670x 3670x 2531x 2531x 75x 75x 75x 75x 75x 75x 75x 2531x 2531x 3670x 3670x 3842x 1580x 1580x 1580x 1580x 1580x 1580x 1580x 1580x 1580x 1580x 1580x 1580x 1580x 4x 4x 1580x 1580x 1580x 1580x 1580x 3840x 31x 31x 2090x 2037x 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4x 291x 291x 291x 1x 1x 291x 291x 291x 291x 291x 291x 291x 291x 291x 291x 291x 291x 291x 291x 291x 291x 291x 291x 291x 291x 291x 291x 291x 291x 291x 291x 291x 125x 125x 33x 125x 92x 92x 125x 125x 291x 291x 291x 291x 69x 69x 291x 291x 291x 6x 6x 6x 6x 6x 6x 6x 6x 291x 291x 291x 19x 19x 291x 2x 2x 291x 62x 62x 62x 18x 18x 62x 62x 62x 62x 62x 62x 62x 62x 62x 62x 204x 204x 204x 31x 62x 62x 62x 62x 31x 31x 31x 31x 31x 31x 31x 62x 62x 62x 62x 62x 62x 62x 62x 62x 62x 62x 62x 291x 291x 291x 291x 297x 297x 297x 297x 69x 296x 228x 228x 2x 2x 578x 578x 578x 578x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 577x 577x 2x 2x 6x 6x 2x 2x 39x 39x 39x 2x 2x 5x 5x 5x 2x 2x 104x 104x 104x 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 104x 96x 96x 96x 96x 96x 96x 2x 2x 130x 2x 2x 31x 31x 31x 31x 52x 24x 24x 52x 31x 31x 31x 31x 31x 2x 2x 235x 235x 235x 235x 235x 235x 235x 235x 235x 235x 235x 235x 235x 235x 235x 235x 235x 235x 170x 4x 4x 4x 170x 165x 165x 79x 79x 165x 84x 62x 84x 22x 22x 84x 166x 1x 1x 170x 235x 235x 235x 235x 235x 235x 235x 235x 235x 235x 235x 235x 235x 44x 44x 235x 235x 235x 235x 235x 235x 235x 235x 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 13x 13x 13x 13x 2x 2x 5x 5x 5x 5x 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, infer_namespace } from '../../utils.js';
import {
DOMProperties,
LoadErrorElements,
PassiveEvents,
VoidElements
} from '../../../constants.js';
import { is_custom_element_node, is_element_node } from '../../../nodes.js';
import * as b from '../../../../utils/builders.js';
import {
with_loc,
function_visitor,
get_assignment_value,
serialize_get_binding,
serialize_set_binding,
create_derived,
create_derived_block_argument
} from '../utils.js';
import {
AttributeAliases,
DOMBooleanAttributes,
EACH_INDEX_REACTIVE,
EACH_IS_ANIMATED,
EACH_IS_CONTROLLED,
EACH_IS_STRICT_EQUALS,
EACH_ITEM_REACTIVE,
EACH_KEYED,
is_capture_event,
TEMPLATE_FRAGMENT,
TEMPLATE_USE_IMPORT_NODE,
TRANSITION_GLOBAL,
TRANSITION_IN,
TRANSITION_OUT
} from '../../../../../constants.js';
import { escape_html } from '../../../../../escaping.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';
import { locator } from '../../../../state.js';
/**
* @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 &&
!element.metadata.mathml &&
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(
'$.invalidate_inner_signals',
b.thunk(
b.block(
names.map((name) => {
const serialized = serialize_get_binding(b.id(name), context.state);
return b.stmt(serialized);
})
)
)
);
context.state.init.push(
b.stmt(
b.call(
'$.template_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').ObjectExpression['properties']} */
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);
if (
name === 'is' &&
value.type === 'Literal' &&
context.state.metadata.namespace === 'html'
) {
context.state.template.push(` is="${escape_html(value.value, true)}"`);
continue;
}
if (
is_event_attribute(attribute) &&
(attribute.value[0].expression.type === 'ArrowFunctionExpression' ||
attribute.value[0].expression.type === 'FunctionExpression')
) {
// Give the event handler a stable ID so it isn't removed and readded on every update
const id = context.state.scope.generate('event_handler');
context.state.init.push(b.var(id, value));
values.push(b.init(attribute.name, b.id(id)));
} else {
values.push(b.init(name, value));
}
} else {
values.push(b.spread(/** @type {import('estree').Expression} */ (context.visit(attribute))));
}
needs_isolation ||=
attribute.type === 'SpreadAttribute' && attribute.metadata.contains_call_expression;
}
const lowercase_attributes =
element.metadata.svg || element.metadata.mathml || is_custom_element_node(element)
? b.false
: b.true;
const id = context.state.scope.generate('attributes');
const update = b.stmt(
b.assignment(
'=',
b.id(id),
b.call(
'$.set_attributes',
element_id,
b.id(id),
b.object(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('$.set_class', element_id, b.literal(context.state.analysis.css.hash)))
);
}
return false;
}
// TODO why are we always treating this as a spread? needs docs, if that's not an error
let needs_isolation = false;
let is_reactive = false;
/** @type {import('estree').ObjectExpression['properties']} */
const values = [];
for (const attribute of attributes) {
if (attribute.type === 'Attribute') {
const [, value] = serialize_attribute_value(attribute.value, context);
if (
is_event_attribute(attribute) &&
(attribute.value[0].expression.type === 'ArrowFunctionExpression' ||
attribute.value[0].expression.type === 'FunctionExpression')
) {
// Give the event handler a stable ID so it isn't removed and readded on every update
const id = context.state.scope.generate('event_handler');
context.state.init.push(b.var(id, value));
values.push(b.init(attribute.name, b.id(id)));
} else {
values.push(b.init(attribute.name, value));
}
} else {
values.push(b.spread(/** @type {import('estree').Expression} */ (context.visit(attribute))));
}
is_reactive ||=
attribute.metadata.dynamic ||
// objects could contain reactive getters -> play it safe and always assume spread attributes are reactive
attribute.type === 'SpreadAttribute';
needs_isolation ||=
attribute.type === 'SpreadAttribute' && attribute.metadata.contains_call_expression;
}
if (needs_isolation || is_reactive) {
const id = context.state.scope.generate('attributes');
context.state.init.push(b.let(id));
const update = b.stmt(
b.assignment(
'=',
b.id(id),
b.call(
'$.set_dynamic_element_attributes',
element_id,
b.id(id),
b.object(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.object(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;
* $.template_effect(() => {
* if (value !== (value = 'new value')) {
* element.property = value;
* // or
* $.set_attribute(element, property, value);
* }
* });
* ```
* Returns true if attribute is deemed reactive, false otherwise.
* @param {import('#compiler').RegularElement} element
* @param {import('estree').Identifier} node_id
* @param {import('#compiler').Attribute} attribute
* @param {import('../types.js').ComponentContext} context
* @returns {boolean}
*/
function serialize_element_attribute_update_assignment(element, node_id, attribute, context) {
const state = context.state;
const name = get_attribute_name(element, attribute, context);
const is_svg = context.state.metadata.namespace === 'svg' || element.name === 'svg';
const is_mathml = context.state.metadata.namespace === 'mathml';
let [contains_call_expression, value] = serialize_attribute_value(attribute.value, context);
// The foreign namespace doesn't have any special handling, everything goes through the attr function
if (context.state.metadata.namespace === 'foreign') {
const statement = b.stmt(b.call('$.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' : is_mathml ? '$.set_mathml_class' : '$.set_class',
node_id,
value
)
);
} else if (name === 'value') {
update = b.stmt(b.call('$.set_value', node_id, value));
} else if (name === 'checked') {
update = b.stmt(b.call('$.set_checked', 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;
/**
* @type {import("estree").ExpressionStatement[]}
*/
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;
/**
* Components may have a children prop and also have child nodes. In this case, we assume
* that the child component isn't using render tags yet and pass the slot as $$slots.default.
* We're not doing it for spread attributes, as this would result in too many false positives.
*/
let has_children_prop = 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;
}
if (attribute.name === 'children') {
has_children_prop = 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, create_derived(context.state, 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('$.add_owner_effect'), b.thunk(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('$$events', events_expression));
}
/** @type {import('estree').Statement[]} */
const snippet_declarations = [];
// Group children by slot
for (const child of node.fragment.nodes) {
if (child.type === 'SnippetBlock') {
// the SnippetBlock visitor adds a declaration to `init`, but if it's directly
// inside a component then we want to hoist them into a block so that they
// can be used as props without creating conflicts
context.visit(child, {
...context.state,
init: snippet_declarations
});
push_prop(b.prop('init', child.expression, child.expression));
continue;
}
let slot_name = 'default';
if (is_element_node(child)) {
const attribute = /** @type {import('#compiler').Attribute | undefined} */ (
child.attributes.find(
(attribute) => attribute.type === 'Attribute' && attribute.name === 'slot'
)
);
if (attribute !== undefined) {
slot_name = /** @type {import('#compiler').Text[]} */ (attribute.value)[0].data;
}
}
(children[slot_name] ||= []).push(child);
}
// Serialize each slot
/** @type {import('estree').Property[]} */
const serialized_slots = [];
for (const slot_name of Object.keys(children)) {
const block = /** @type {import('estree').BlockStatement} */ (
context.visit(
{
...node.fragment,
// @ts-expect-error
nodes: children[slot_name]
},
{
...context.state,
scope:
context.state.scopes.get(slot_name === 'default' ? children[slot_name][0] : node) ??
context.state.scope
}
)
);
if (block.body.length === 0) continue;
const slot_fn = b.arrow(
[b.id('$$anchor'), b.id('$$slotProps')],
b.block([
...(slot_name === 'default' && !slot_scope_applies_to_itself ? lets : []),
...block.body
])
);
if (slot_name === 'default' && !has_children_prop) {
push_prop(
b.init(
'children',
context.state.options.dev
? b.call('$.wrap_snippet', slot_fn, b.id(context.state.analysis.name))
: slot_fn
)
);
// We additionally add the default slot as a boolean, so that the slot render function on the other
// side knows it should get the content to render from $$props.children
serialized_slots.push(b.init(slot_name, b.true));
} else {
serialized_slots.push(b.init(slot_name, slot_fn));
}
}
if (serialized_slots.length > 0) {
push_prop(b.init('$$slots', b.object(serialized_slots)));
}
if (!context.state.analysis.runes) {
push_prop(b.init('$$legacy', b.true));
}
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(
'$.spread_props',
...props_and_spreads.map((p) => (Array.isArray(p) ? b.object(p) : p))
);
/** @param {import('estree').Expression} node_id */
let fn = (node_id) => {
return b.call(
context.state.options.dev
? b.call('$.validate_component', b.id(component_name))
: component_name,
node_id,
props_expression
);
};
if (bind_this !== null) {
const prev = fn;
fn = (node_id) => {
return serialize_bind_this(
/** @type {import('estree').Identifier | import('estree').MemberExpression} */ (bind_this),
context,
prev(node_id)
);
};
}
const statements = [...snippet_declarations];
if (node.type === 'SvelteComponent') {
const prev = fn;
fn = (node_id) => {
return b.call(
'$.component',
b.thunk(/** @type {import('estree').Expression} */ (context.visit(node.expression))),
b.arrow(
[b.id(component_name)],
b.block([
...binding_initializers,
b.stmt(
context.state.options.dev
? b.call('$.validate_dynamic_component', b.thunk(prev(node_id)))
: prev(node_id)
)
])
)
);
};
} else {
statements.push(...binding_initializers);
}
if (Object.keys(custom_css_props).length > 0) {
context.state.template.push(
context.state.metadata.namespace === 'svg'
? '<g><!></g>'
: '<div style="display: contents"><!></div>'
);
statements.push(
b.stmt(b.call('$.css_props', context.state.node, b.thunk(b.object(custom_css_props)))),
b.stmt(fn(b.member(context.state.node, b.id('lastChild'))))
);
} else {
context.state.template.push('<!>');
statements.push(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('$.bind_this', ...args);
}
/**
* @param {import('../types.js').SourceLocation[]} locations
*/
function serialize_locations(locations) {
return b.array(
locations.map((loc) => {
const expression = b.array([b.literal(loc[0]), b.literal(loc[1])]);
if (loc.length === 3) {
expression.elements.push(serialize_locations(loc[2]));
}
return expression;
})
);
}
/**
*
* @param {import('#compiler').Namespace} namespace
* @param {import('../types.js').ComponentClientTransformState} state
* @returns
*/
function get_template_function(namespace, state) {
const contains_script_tag = state.metadata.context.template_contains_script_tag;
return namespace === 'svg'
? contains_script_tag
? '$.svg_template_with_script'
: '$.ns_template'
: namespace === 'mathml'
? '$.mathml_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('$.template_effect', b.thunk(body)));
}
/**
*
* @param {import('../types.js').ComponentClientTransformState} state
*/
function serialize_render_stmt(state) {
return state.update.length === 1
? serialize_update(state.update[0])
: b.stmt(b.call('$.template_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 }) {
/** @type {import('estree').Expression} */
let handler;
if (node.expression) {
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));
}
} else {
state.analysis.needs_props = true;
// Function + .call to preserve "this" context as much as possible
handler = b.function(
null,
[b.id('$$arg')],
b.block([b.stmt(b.call('$.bubble_event.call', b.this, b.id('$$props'), b.id('$$arg')))])
);
}
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;
}
/**
* 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 (is_capture_event(event_name)) {
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')),
/** @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>} value
* @param {import('../types').ComponentContext} context
* @returns {[contains_call_expression: boolean, import('estree').Expression]}
*/
function serialize_attribute_value(value, context) {
if (value === true) {
return [false, b.literal(true)];
}
if (value.length === 1) {
const chunk = value[0];
if (chunk.type === 'Text') {
return [false, b.literal(chunk.data)];
}
return [
chunk.metadata.contains_call_expression,
/** @type {import('estree').Expression} */ (context.visit(chunk.expression))
];
}
return serialize_template_literal(value, context.visit, context.state);
}
/**
* @param {Array<import('#compiler').Text | import('#compiler').ExpressionTag>} values
* @param {(node: import('#compiler').SvelteNode, state: any) => 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,
create_derived(
state,
b.thunk(/** @type {import('estree').Expression} */ (visit(node.expression, state)))
)
)
);
expressions.push(b.call('$.get', id));
} else {
expressions.push(b.logical('??', visit(node.expression, state), b.literal('')));
}
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) {
// 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.
const parent = context.path.at(-1) ?? node;
const namespace = infer_namespace(context.state.metadata.namespace, parent, node.nodes);
const { hoisted, trimmed } = clean_nodes(
parent,
node.nodes,
context.path,
namespace,
context.state,
context.state.preserve_whitespace,
context.state.options.preserveComments
);
if (hoisted.length === 0 && trimmed.length === 0) {
return b.block([]);
}
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('root'); // TODO infer name from parent
/** @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: [],
locations: [],
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);
}
/**
* @param {import('estree').Identifier} template_name
* @param {import('estree').Expression[]} args
*/
const add_template = (template_name, args) => {
let call = b.call(get_template_function(namespace, state), ...args);
if (context.state.options.dev) {
call = b.call(
'$.add_locations',
call,
b.member(b.id(context.state.analysis.name), b.id('filename')),
serialize_locations(state.locations)
);
}
context.state.hoisted.push(b.var(template_name, call));
};
if (is_single_element) {
const element = /** @type {import('#compiler').RegularElement} */ (trimmed[0]);
const id = b.id(context.state.scope.generate(element.name));
context.visit(element, {
...state,
node: id
});
/** @type {import('estree').Expression[]} */
const args = [b.template([b.quasi(state.template.join(''), true)], [])];
if (state.metadata.context.template_needs_import_node) {
args.push(b.literal(TEMPLATE_USE_IMPORT_NODE));
}
add_template(template_name, args);
body.push(b.var(id, b.call(template_name)), ...state.before_init, ...state.init);
close = b.stmt(b.call('$.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('$$anchor'), id));
} else {
/** @type {(is_text: boolean) => import('estree').Expression} */
const expression = (is_text) =>
is_text ? b.call('$.first_child', id, b.true) : b.call('$.first_child', id);
process_children(trimmed, expression, false, { ...context, state });
const use_comment_template = state.template.length === 1 && state.template[0] === '<!>';
if (use_comment_template) {
// special case — we can use `$.comment` instead of creating a unique template
body.push(b.var(id, b.call('$.comment')));
} else {
let flags = TEMPLATE_FRAGMENT;
if (state.metadata.context.template_needs_import_node) {
flags |= TEMPLATE_USE_IMPORT_NODE;
}
add_template(template_name, [
b.template([b.quasi(state.template.join(''), true)], []),
b.literal(flags)
]);
body.push(b.var(id, b.call(template_name)));
}
body.push(...state.before_init, ...state.init);
close = b.stmt(b.call('$.append', b.id('$$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 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'),
b.literal(context.state.metadata.namespace === 'mathml')
)
)
);
},
ConstTag(node, { state, visit }) {
const declaration = node.declaration.declarations[0];
// TODO we can almost certainly share some code with $derived(...)
if (declaration.id.type === 'Identifier') {
state.init.push(
b.const(
declaration.id,
create_derived(
state,
b.thunk(/** @type {import('estree').Expression} */ (visit(declaration.init)))
)
)
);
// we need to eagerly evaluate the expression in order to hit any
// 'Cannot access x before initialization' errors
if (state.options.dev) {
state.init.push(b.stmt(b.call('$.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(b.const(tmp, create_derived(state, 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(
'$.template_effect',
b.thunk(
b.block([
b.stmt(
b.call(
'console.log',
b.object(
node.identifiers.map((identifier) =>
b.prop(
'init',
identifier,
/** @type {import('estree').Expression} */ (visit(identifier))
)
)
)
)
),
b.debugger
])
)
)
)
);
},
RenderTag(node, context) {
context.state.template.push('<!>');
const callee = unwrap_optional(node.expression).callee;
const raw_args = unwrap_optional(node.expression).arguments;
const is_reactive =
callee.type !== 'Identifier' || context.state.scope.get(callee.name)?.kind !== 'normal';
/** @type {import('estree').Expression[]} */
const args = [context.state.node];
for (const arg of raw_args) {
args.push(b.thunk(/** @type {import('estree').Expression} */ (context.visit(arg))));
}
let snippet_function = /** @type {import('estree').Expression} */ (context.visit(callee));
if (context.state.options.dev) {
snippet_function = b.call('$.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 }) {
throw new Error('Node should have been handled elsewhere');
},
StyleDirective(node, { state, next }) {
throw new Error('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('$.transition', ...args)));
},
RegularElement(node, context) {
/** @type {import('../types.js').SourceLocation} */
let location = [-1, -1];
if (context.state.options.dev) {
const loc = locator(node.start);
if (loc) {
location[0] = loc.line;
location[1] = loc.column;
context.state.locations.push(location);
}
}
if (node.name === 'noscript') {
context.state.template.push('<!>');
return;
}
if (node.name === 'script') {
context.state.metadata.context.template_contains_script_tag = true;
}
const metadata = context.state.metadata;
const child_metadata = {
...context.state.metadata,
namespace: determine_namespace_for_children(node, context.state.metadata.namespace)
};
context.state.template.push(`<${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;
let img_might_be_lazy = false;
let might_need_event_replaying = false;
let has_direction_attribute = 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 (node.name === 'img' && attribute.name === 'loading') {
img_might_be_lazy = true;
}
if (attribute.name === 'dir') {
has_direction_attribute = true;
}
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;
if (LoadErrorElements.includes(node.name)) {
might_need_event_replaying = 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;
}
} else if (attribute.type === 'UseDirective' && LoadErrorElements.includes(node.name)) {
might_need_event_replaying = 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') {
context.state.init.push(b.stmt(b.call('$.remove_input_defaults', context.state.node)));
}
if (needs_content_reset && node.name === 'textarea') {
context.state.init.push(b.stmt(b.call('$.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) {
if (node.name === 'img') {
img_might_be_lazy = true;
}
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)) {
if (
(attribute.name === 'onload' || attribute.name === 'onerror') &&
LoadErrorElements.includes(node.name)
) {
might_need_event_replaying = true;
}
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
? ''
: `="${literal_value === true ? '' : escape_html(literal_value, true)}"`
}`
);
continue;
}
}
const is =
is_custom_element && child_metadata.namespace !== 'foreign'
? serialize_custom_element_attribute_update_assignment(node_id, attribute, context)
: serialize_element_attribute_update_assignment(node, node_id, attribute, context);
if (is) is_attributes_reactive = true;
}
}
// Apply the src and loading attributes for <img> elements after the element is appended to the document
if (img_might_be_lazy) {
context.state.after_update.push(b.stmt(b.call('$.handle_lazy_img', node_id)));
}
// 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);
if (might_need_event_replaying) {
context.state.after_update.push(b.stmt(b.call('$.replay_events', node_id)));
}
context.state.template.push('>');
/** @type {import('../types.js').SourceLocation[]} */
const child_locations = [];
/** @type {import('../types').ComponentClientTransformState} */
const state = {
...context.state,
metadata: child_metadata,
locations: child_locations,
scope: /** @type {import('../../../scope').Scope} */ (
context.state.scopes.get(node.fragment)
),
preserve_whitespace:
context.state.preserve_whitespace ||
((node.name === 'pre' || node.name === 'textarea') &&
child_metadata.namespace !== 'foreign')
};
const { hoisted, trimmed } = clean_nodes(
node,
node.fragment.nodes,
context.path,
child_metadata.namespace,
state,
node.name === 'script' || state.preserve_whitespace,
state.options.preserveComments
);
for (const node of hoisted) {
context.visit(node, state);
}
process_children(
trimmed,
() =>
b.call(
'$.child',
node.name === 'template'
? b.member(context.state.node, b.id('content'))
: context.state.node
),
true,
{ ...context, state }
);
if (has_direction_attribute) {
context.state.update.push(b.stmt(b.call('$.set_direction', node_id)));
}
if (child_locations.length > 0) {
// @ts-expect-error
location.push(child_locations);
}
if (!VoidElements.includes(node.name)) {
context.state.template.push(`</${node.name}>`);
}
},
SvelteElement(node, context) {
context.state.template.push(`<!>`);
/** @type {Array<import('#compiler').Attribute | import('#compiler').SpreadAttribute>} */
const attributes = [];
/** @type {import('#compiler').Attribute['value'] | undefined} */
let dynamic_namespace = undefined;
/** @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') {
if (attribute.name === 'xmlns' && !is_text_attribute(attribute)) {
dynamic_namespace = attribute.value;
}
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(
.../** @type {import('estree').BlockStatement} */ (
context.visit(node.fragment, {
...context.state,
metadata: {
...context.state.metadata,
namespace: determine_namespace_for_children(node, context.state.metadata.namespace)
}
})
).body
);
const location = context.state.options.dev && locator(node.start);
context.state.init.push(
b.stmt(
b.call(
'$.element',
context.state.node,
get_tag,
node.metadata.svg || node.metadata.mathml ? b.true : b.false,
inner.length > 0 && b.arrow([element_id, b.id('$$anchor')], b.block(inner)),
dynamic_namespace && b.thunk(serialize_attribute_value(dynamic_namespace, context)[1]),
location && b.array([b.literal(location.line), b.literal(location.column)])
)
)
);
},
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 = (/** @type {import("estree").Identifier} */ 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));
}
}
}
const block = /** @type {import('estree').BlockStatement} */ (context.visit(node.body));
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(block.body)))
];
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('$$anchor')],
/** @type {import('estree').BlockStatement} */ (context.visit(node.alternate))
)
: b.literal(null)
);
}
if (node.elseif) {
// We treat this...
//
// {#if x}
// ...
// {:else}
// {#if y}
// <div transition:foo>...</div>
// {/if}
// {/if}
//
// ...slightly differently to this...
//
// {#if x}
// ...
// {:else if y}
// <div transition:foo>...</div>
// {/if}
//
// ...even though they're logically equivalent. In the first case, the
// transition will only play when `y` changes, but in the second it
// should play when `x` or `y` change — both are considered 'local'
args.push(b.literal(true));
}
context.state.init.push(b.stmt(b.call('$.if', ...args)));
},
AwaitBlock(node, context) {
context.state.template.push('<!>');
let then_block;
let catch_block;
if (node.then) {
/** @type {import('estree').Pattern[]} */
const args = [b.id('$$anchor')];
const block = /** @type {import('estree').BlockStatement} */ (context.visit(node.then));
if (node.value) {
const argument = create_derived_block_argument(node.value, context);
args.push(argument.id);
if (argument.declarations !== null) {
block.body.unshift(...argument.declarations);
}
}
then_block = b.arrow(args, block);
}
if (node.catch) {
/** @type {import('estree').Pattern[]} */
const args = [b.id('$$anchor')];
const block = /** @type {import('estree').BlockStatement} */ (context.visit(node.catch));
if (node.error) {
const argument = create_derived_block_argument(node.error, context);
args.push(argument.id);
if (argument.declarations !== null) {
block.body.unshift(...argument.declarations);
}
}
catch_block = b.arrow(args, block);
}
context.state.init.push(
b.stmt(
b.call(
'$.await',
context.state.node,
b.thunk(/** @type {import('estree').Expression} */ (context.visit(node.expression))),
node.pending
? b.arrow(
[b.id('$$anchor')],
/** @type {import('estree').BlockStatement} */ (context.visit(node.pending))
)
: b.literal(null),
then_block,
catch_block
)
)
);
},
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 = `$$arg${i}`;
args.push(b.id(arg_alias));
const paths = extract_paths(argument);
for (const path of paths) {
const name = /** @type {import('estree').Identifier} */ (path.node).name;
const binding = /** @type {import('#compiler').Binding} */ (context.state.scope.get(name));
const needs_derived = path.has_default_value; // to ensure that default value is only called once
const fn = b.thunk(
/** @type {import('estree').Expression} */ (
context.visit(path.expression?.(b.maybe_call(b.id(arg_alias))))
)
);
declarations.push(
b.let(path.node, needs_derived ? b.call('$.derived_safe_equal', fn) : fn)
);
binding.expression = needs_derived ? b.call('$.get', b.id(name)) : b.call(name);
// we need to eagerly evaluate the expression in order to hit any
// 'Cannot access x before initialization' errors
if (context.state.options.dev) {
declarations.push(b.stmt(binding.expression));
}
}
}
body = b.block([
...declarations,
.../** @type {import('estree').BlockStatement} */ (context.visit(node.body)).body
]);
/** @type {import('estree').Expression} */
let snippet = b.arrow(args, body);
if (context.state.options.dev) {
snippet = b.call('$.wrap_snippet', snippet, b.id(context.state.analysis.name));
}
const declaration = b.var(node.expression, snippet);
// Top-level snippets are hoisted so they can be referenced in the `<script>`
if (context.path.length === 1 && context.path[0].type === 'Fragment') {
context.state.analysis.top_level_snippets.push(declaration);
} else {
context.state.init.push(declaration);
}
},
FunctionExpression: function_visitor,
ArrowFunctionExpression: function_visitor,
FunctionDeclaration(node, context) {
context.next({ ...context.state, in_constructor: false });
},
OnDirective(node, context) {
serialize_event(node, context);
},
UseDirective(node, { state, next, visit }) {
const params = [b.id('$$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)),
null,
{
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),
state.node,
setter,
property.bidirectional && getter
);
} 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;
// document
case 'activeElement':
call_expr = b.call('$.bind_active_element', 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 'focused':
call_expr = b.call(`$.bind_focused`, state.node, 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:
throw new Error('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) {
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',
// 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('$$component')], b.block([component]))
)
)
);
return;
}
const component = serialize_inline_component(node, node.name, context);
context.state.init.push(component);
},
SvelteSelf(node, context) {
const component = serialize_inline_component(node, context.state.analysis.name, context);
context.state.init.push(component);
},
SvelteComponent(node, context) {
let component = serialize_inline_component(node, '$$component', context);
context.state.init.push(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('$$slotProps'), b.id(node.name))
),
b.return(b.object(bindings.map((binding) => b.init(binding.node.name, binding.node))))
])
)
)
);
} else {
const name = node.expression === null ? node.name : node.expression.name;
return b.const(
name,
create_derived(state, b.thunk(b.member(b.id('$$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)));
}
}
context.state.init.push(...lets);
context.state.init.push(
.../** @type {import('estree').BlockStatement} */ (context.visit(node.fragment)).body
);
},
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')],
/** @type {import('estree').BlockStatement} */ (context.visit(node.fragment))
);
const expression = is_default
? b.call('$.default_slot', b.id('$$props'))
: b.member(b.member(b.id('$$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')],
/** @type {import('estree').BlockStatement} */ (context.visit(node.fragment))
)
)
)
);
},
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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