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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); } } } |