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/** @import { AST, TemplateNode } from '#compiler' */
/** @import { ComponentContext } from '../../types.js' */
import { dev, is_ignored } from '../../../../../state.js';
import { get_attribute_chunks } from '../../../../../utils/ast.js';
import * as b from '../../../../../utils/builders.js';
import { create_derived } from '../../utils.js';
import { build_bind_this, validate_binding } from '../shared/utils.js';
import { build_attribute_value } from '../shared/element.js';
import { build_event_handler } from './events.js';
import { determine_slot } from '../../../../../utils/slot.js';
/**
* @param {AST.Component | AST.SvelteComponent | AST.SvelteSelf} node
* @param {string} component_name
* @param {ComponentContext} context
* @param {Expression} anchor
* @returns {Statement}
*/
export function build_component(node, component_name, context, anchor = context.state.node) {
/** @type {Array<Property[] | Expression>} */
const props_and_spreads = [];
/** @type {ExpressionStatement[]} */
const lets = [];
/** @type {Record<string, typeof context.state>} */
const states = {
default: {
...context.state,
scope: node.metadata.scopes.default,
transform: { ...context.state.transform }
}
};
/** @type {Record<string, TemplateNode[]>} */
const children = {};
/** @type {Record<string, Expression[]>} */
const events = {};
/** @type {Property[]} */
const custom_css_props = [];
/** @type {Identifier | MemberExpression | null} */
let bind_this = null;
/** @type {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 = !!determine_slot(node);
/**
* 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 {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);
}
}
if (slot_scope_applies_to_itself) {
for (const attribute of node.attributes) {
if (attribute.type === 'LetDirective') {
lets.push(/** @type {ExpressionStatement} */ (context.visit(attribute)));
}
}
}
for (const attribute of node.attributes) {
if (attribute.type === 'LetDirective') {
if (!slot_scope_applies_to_itself) {
lets.push(/** @type {ExpressionStatement} */ (context.visit(attribute, states.default)));
}
} else if (attribute.type === 'OnDirective') {
if (!attribute.expression) {
context.state.analysis.needs_props = true;
}
let handler = build_event_handler(
attribute.expression,
attribute.metadata.expression,
context
);
if (attribute.modifiers.includes('once')) {
handler = b.call('$.once', handler);
}
(events[attribute.name] ||= []).push(handler);
} else if (attribute.type === 'SpreadAttribute') {
const expression = /** @type {Expression} */ (context.visit(attribute));
if (attribute.metadata.expression.has_state) {
let value = expression;
if (attribute.metadata.expression.has_call) {
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, build_attribute_value(attribute.value, context).value)
);
continue;
}
if (attribute.name === 'slot') {
slot_scope_applies_to_itself = true;
}
if (attribute.name === 'children') {
has_children_prop = true;
}
const { value } = build_attribute_value(attribute.value, context);
if (attribute.metadata.expression.has_state) {
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 = get_attribute_chunks(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') {
const expression = /** @type {Expression} */ (context.visit(attribute.expression));
if (
dev &&
expression.type === 'MemberExpression' &&
context.state.analysis.runes &&
!is_ignored(node, 'binding_property_non_reactive')
) {
validate_binding(context.state, attribute, expression);
}
if (attribute.name === 'this') {
bind_this = attribute.expression;
} else {
if (dev) {
binding_initializers.push(
b.stmt(
b.call(
b.id('$.add_owner_effect'),
b.thunk(expression),
b.id(component_name),
is_ignored(node, 'ownership_invalid_binding') && b.true
)
)
);
}
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(/** @type {Expression} */ (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('$$events', events_expression));
}
/** @type {Statement[]} */
const snippet_declarations = [];
/** @type {import('estree').Property[]} */
const serialized_slots = [];
// Group children by slot
for (const child of node.fragment.nodes) {
if (child.type === 'SnippetBlock') {
// the SnippetBlock visitor adds a declaration to `init`, but if it's directly
// inside a component then we want to hoist them into a block so that they
// can be used as props without creating conflicts
context.visit(child, {
...context.state,
init: snippet_declarations
});
push_prop(b.prop('init', child.expression, child.expression));
// Interop: allows people to pass snippets when component still uses slots
serialized_slots.push(
b.init(child.expression.name === 'children' ? 'default' : child.expression.name, b.true)
);
continue;
}
let slot_name = determine_slot(child) ?? 'default';
(children[slot_name] ||= []).push(child);
}
// Serialize each slot
for (const slot_name of Object.keys(children)) {
const block = /** @type {BlockStatement} */ (
context.visit(
{
...node.fragment,
// @ts-expect-error
nodes: children[slot_name]
},
slot_name === 'default'
? slot_scope_applies_to_itself
? context.state
: states.default
: {
...context.state,
scope: node.metadata.scopes[slot_name],
transform: { ...context.state.transform }
}
)
);
if (block.body.length === 0) continue;
const slot_fn = b.arrow(
[b.id('$$anchor'), b.id('$$slotProps')],
b.block([
...(slot_name === 'default' && !slot_scope_applies_to_itself ? lets : []),
...block.body
])
);
if (slot_name === 'default' && !has_children_prop) {
if (
lets.length === 0 &&
children.default.every(
(node) =>
node.type !== 'SvelteFragment' ||
!node.attributes.some((attr) => attr.type === 'LetDirective')
)
) {
// create `children` prop...
push_prop(
b.init(
'children',
dev ? b.call('$.wrap_snippet', b.id(context.state.analysis.name), slot_fn) : slot_fn
)
);
// and `$$slots.default: true` so that `<slot>` on the child works
serialized_slots.push(b.init(slot_name, b.true));
} else {
// create `$$slots.default`...
serialized_slots.push(b.init(slot_name, slot_fn));
// and a `children` prop that errors
push_prop(b.init('children', b.id('$.invalid_default_snippet')));
}
} else {
serialized_slots.push(b.init(slot_name, slot_fn));
}
}
if (serialized_slots.length > 0) {
push_prop(b.init('$$slots', b.object(serialized_slots)));
}
if (
!context.state.analysis.runes &&
node.attributes.some((attribute) => attribute.type === 'BindDirective')
) {
push_prop(b.init('$$legacy', b.true));
}
const props_expression =
props_and_spreads.length === 0 ||
(props_and_spreads.length === 1 && Array.isArray(props_and_spreads[0]))
? b.object(/** @type {Property[]} */ (props_and_spreads[0]) || [])
: b.call(
'$.spread_props',
...props_and_spreads.map((p) => (Array.isArray(p) ? b.object(p) : p))
);
/** @param {Expression} node_id */
let fn = (node_id) => {
return b.call(
// TODO We can remove this ternary once we remove legacy mode, since in runes mode dynamic components
// will be handled separately through the `$.component` function, and then the component name will
// always be referenced through just the identifier here.
node.type === 'SvelteComponent'
? component_name
: /** @type {Expression} */ (context.visit(b.member_id(component_name))),
node_id,
props_expression
);
};
if (bind_this !== null) {
const prev = fn;
fn = (node_id) => {
return build_bind_this(bind_this, prev(node_id), context);
};
}
const statements = [...snippet_declarations];
if (node.type === 'SvelteComponent') {
const prev = fn;
fn = (node_id) => {
return b.call(
'$.component',
node_id,
b.thunk(/** @type {Expression} */ (context.visit(node.expression))),
b.arrow(
[b.id('$$anchor'), b.id(component_name)],
b.block([...binding_initializers, b.stmt(prev(b.id('$$anchor')))])
)
);
};
} else {
statements.push(...binding_initializers);
}
if (Object.keys(custom_css_props).length > 0) {
context.state.template.push(
context.state.metadata.namespace === 'svg'
? '<g><!></g>'
: '<svelte-css-wrapper style="display: contents"><!></svelte-css-wrapper>'
);
statements.push(
b.stmt(b.call('$.css_props', anchor, b.thunk(b.object(custom_css_props)))),
b.stmt(fn(b.member(anchor, 'lastChild'))),
b.stmt(b.call('$.reset', anchor))
);
} else {
context.state.template.push('<!>');
statements.push(b.stmt(fn(anchor)));
}
return statements.length > 1 ? b.block(statements) : statements[0];
}
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