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/** @import { AST, TemplateNode } from '#compiler' */
/** @import { ComponentContext } from '../../types.js' */
import { empty_comment, build_attribute_value } from './utils.js';
import * as b from '../../../../../utils/builders.js';
import { is_element_node } from '../../../../nodes.js';
/**
* @param {AST.Component | AST.SvelteComponent | AST.SvelteSelf} node
* @param {Expression} expression
* @param {ComponentContext} context
*/
export function build_inline_component(node, expression, context) {
/** @type {Array<Property[] | Expression>} */
const props_and_spreads = [];
/** @type {Property[]} */
const custom_css_props = [];
/** @type {Record<string, AST.LetDirective[]>} */
const lets = { default: [] };
/**
* Children in the default slot are evaluated in the component scope,
* children in named slots are evaluated in the parent scope
*/
const child_state = {
...context.state,
scope: node.metadata.scopes.default
};
/** @type {Record<string, TemplateNode[]>} */
const children = {};
/**
* 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.
*/
const slot_scope_applies_to_itself = node.attributes.some(
(node) => node.type === 'Attribute' && node.name === 'slot'
);
/**
* 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 $$slots.default.
* We're not doing it for spread attributes, as this would result in too many false positives.
*/
let has_children_prop = false;
/**
* @param {Property} prop
*/
function push_prop(prop) {
const current = props_and_spreads.at(-1);
const current_is_props = Array.isArray(current);
const props = current_is_props ? current : [];
props.push(prop);
if (!current_is_props) {
props_and_spreads.push(props);
}
}
for (const attribute of node.attributes) {
if (attribute.type === 'LetDirective') {
if (!slot_scope_applies_to_itself) {
lets.default.push(attribute);
}
} else if (attribute.type === 'SpreadAttribute') {
props_and_spreads.push(/** @type {Expression} */ (context.visit(attribute)));
} else if (attribute.type === 'Attribute') {
if (attribute.name.startsWith('--')) {
const value = build_attribute_value(attribute.value, context, false, true);
custom_css_props.push(b.init(attribute.name, value));
continue;
}
if (attribute.name === 'children') {
has_children_prop = true;
}
const value = build_attribute_value(attribute.value, context, false, true);
push_prop(b.prop('init', b.key(attribute.name), value));
} else if (attribute.type === 'BindDirective' && attribute.name !== 'this') {
// TODO this needs to turn the whole thing into a while loop because the binding could be mutated eagerly in the child
push_prop(
b.get(attribute.name, [
b.return(/** @type {Expression} */ (context.visit(attribute.expression)))
])
);
push_prop(
b.set(attribute.name, [
b.stmt(
/** @type {Expression} */ (
context.visit(b.assignment('=', attribute.expression, b.id('$$value')))
)
),
b.stmt(b.assignment('=', b.id('$$settled'), b.false))
])
);
}
}
/** @type {Statement[]} */
const snippet_declarations = [];
/** @type {Property[]} */
const serialized_slots = [];
// Group children by slot
for (const child of node.fragment.nodes) {
if (child.type === 'SnippetBlock') {
// the SnippetBlock visitor adds a declaration to `init`, but if it's directly
// inside a component then we want to hoist them into a block so that they
// can be used as props without creating conflicts
context.visit(child, {
...context.state,
init: snippet_declarations
});
push_prop(b.prop('init', child.expression, child.expression));
// Interop: allows people to pass snippets when component still uses slots
serialized_slots.push(b.init(child.expression.name, b.true));
continue;
}
let slot_name = 'default';
if (is_element_node(child)) {
const slot = /** @type {AST.Attribute | undefined} */ (
child.attributes.find(
(attribute) => attribute.type === 'Attribute' && attribute.name === 'slot'
)
);
if (slot !== undefined) {
slot_name = /** @type {AST.Text[]} */ (slot.value)[0].data;
lets[slot_name] = child.attributes.filter((attribute) => attribute.type === 'LetDirective');
} else if (child.type === 'SvelteFragment') {
lets.default.push(
...child.attributes.filter((attribute) => attribute.type === 'LetDirective')
);
}
}
children[slot_name] = children[slot_name] || [];
children[slot_name].push(child);
}
// Serialize each slot
for (const slot_name of Object.keys(children)) {
const block = /** @type {BlockStatement} */ (
context.visit(
{
...node.fragment,
// @ts-expect-error
nodes: children[slot_name]
},
slot_name === 'default'
? child_state
: {
...context.state,
scope: node.metadata.scopes[slot_name]
}
)
);
if (block.body.length === 0) continue;
/** @type {Pattern[]} */
const params = [b.id('$$payload')];
if (lets[slot_name].length > 0) {
const pattern = b.object_pattern(
lets[slot_name].map((node) => {
if (node.expression === null) {
return b.init(node.name, b.id(node.name));
}
if (node.expression.type === 'ObjectExpression') {
// @ts-expect-error it gets parsed as an `ObjectExpression` but is really an `ObjectPattern`
return b.init(node.name, b.object_pattern(node.expression.properties));
}
if (node.expression.type === 'ArrayExpression') {
// @ts-expect-error it gets parsed as an `ArrayExpression` but is really an `ArrayPattern`
return b.init(node.name, b.array_pattern(node.expression.elements));
}
return b.init(node.name, node.expression);
})
);
params.push(pattern);
}
const slot_fn = b.arrow(params, b.block(block.body));
if (slot_name === 'default' && !has_children_prop) {
if (
lets.default.length === 0 &&
children.default.every((node) => node.type !== 'SvelteFragment')
) {
// create `children` prop...
push_prop(b.prop('init', b.id('children'), 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.prop('init', b.id('$$slots'), b.object(serialized_slots)));
}
const props_expression =
props_and_spreads.length === 0 ||
(props_and_spreads.length === 1 && Array.isArray(props_and_spreads[0]))
? b.object(/** @type {Property[]} */ (props_and_spreads[0] || []))
: b.call(
'$.spread_props',
b.array(props_and_spreads.map((p) => (Array.isArray(p) ? b.object(p) : p)))
);
/** @type {Statement} */
let statement = b.stmt(
(node.type === 'SvelteComponent' ? b.maybe_call : b.call)(
expression,
b.id('$$payload'),
props_expression
)
);
if (snippet_declarations.length > 0) {
statement = b.block([...snippet_declarations, statement]);
}
const dynamic =
node.type === 'SvelteComponent' || (node.type === 'Component' && node.metadata.dynamic);
if (custom_css_props.length > 0) {
context.state.template.push(
b.stmt(
b.call(
'$.css_props',
b.id('$$payload'),
b.literal(context.state.namespace === 'svg' ? false : true),
b.object(custom_css_props),
b.thunk(b.block([statement])),
dynamic && b.true
)
)
);
} else {
if (dynamic) {
context.state.template.push(empty_comment);
}
context.state.template.push(statement);
if (!context.state.skip_hydration_boundaries) {
context.state.template.push(empty_comment);
}
}
}
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