implement conditional slot for ssr

src/compiler/compile/compiler_errors.ts

@@ -293,8 +293,8 @@ export default {
 	duplicate_slot_name_in_component: (slot_name: string, component_name: string) => ({
 		code: 'duplicate-slot-name-in-component',
 		message:
-			slot_name === "default"
+			slot_name === 'default'
 				? 'Found elements without slot attribute when using slot="default"'
-				: `Duplicate slot name "${slot_name}" in <${component_name}>`,
+				: `Duplicate slot name "${slot_name}" in <${component_name}>`
-	}),
+	})
 };

src/compiler/compile/nodes/InlineComponent.ts

@@ -11,8 +11,7 @@ import { INode } from './interfaces';
 import { TemplateNode } from '../../interfaces';
 import compiler_errors from '../compiler_errors';
 import { regex_only_whitespaces } from '../../utils/patterns';
-import SlotTemplateIfBlock, { validate_get_slot_names } from './SlotTemplateIfBlock';
+import { validate_get_slot_names } from './SlotTemplateIfBlock';
-import SlotTemplate from './SlotTemplate';
 
 export default class InlineComponent extends Node {
 	type: 'InlineComponent';

src/compiler/compile/nodes/SlotTemplateElseBlock.ts

@@ -1,9 +1,6 @@
 import Component from '../Component';
 import Expression from './shared/Expression';
 import TemplateScope from './shared/TemplateScope';
-import Node from './shared/Node';
-import Let from './Let';
-import Attribute from './Attribute';
 import { INode } from './interfaces';
 import compiler_errors from '../compiler_errors';
 import get_const_tags from './shared/get_const_tags';

src/compiler/compile/nodes/SlotTemplateIfBlock.ts

@@ -67,7 +67,7 @@ export default class SlotTemplateIfBlock extends AbstractBlock {
 	}
 }
 
-export function validate_get_slot_names(children: Array<INode>, component: Component, component_name: string) {
+export function validate_get_slot_names(children: INode[], component: Component, component_name: string) {
 	const slot_names = new Map<string, SlotTemplate>();
 	function add_slot_name(slot_name: string, child: SlotTemplate) {
 		if (slot_names.has(slot_name)) {
@@ -87,4 +87,4 @@ export function validate_get_slot_names(children: Array<INode>, component: Compo
 		}
 	}
 	return slot_names;
-}
+}

src/compiler/compile/render_dom/wrappers/InlineComponent/index.ts

@@ -9,7 +9,6 @@ import { sanitize } from '../../../../utils/names';
 import add_to_set from '../../../utils/add_to_set';
 import { b, x, p } from 'code-red';
 import Attribute from '../../../nodes/Attribute';
-import is_dynamic from '../shared/is_dynamic';
 import bind_this from '../shared/bind_this';
 import { Node, Identifier, ObjectExpression } from 'estree';
 import EventHandler from '../Element/EventHandler';
@@ -308,7 +307,7 @@ export default class InlineComponentWrapper extends Wrapper {
 				if (${renderer.dirty(Array.from(dependencies))}) {
 					${name_changes}.$$slots = ${get_slots_definition}(#ctx);
 				}
-			`)
+			`);
 		}
 
 		const munged_bindings = this.node.bindings.map(binding => {

src/compiler/compile/render_dom/wrappers/Slot.ts

@@ -234,7 +234,7 @@ export default class SlotWrapper extends Wrapper {
 			if (!(${renderer.dirty(['#slots'])} && ${slot}.p(#ctx))) {
 				${slot_or_fallback_update}
 			}
-		`)
+		`);
 
 		block.chunks.destroy.push(
 			b`if (${slot}) ${slot}.d(detaching);`

src/compiler/compile/render_dom/wrappers/SlotTemplate.ts

@@ -3,7 +3,7 @@ import Renderer from '../Renderer';
 import Block from '../Block';
 import FragmentWrapper from './Fragment';
 import create_debugging_comment from './shared/create_debugging_comment';
-import { get_slot_definition, SlotDefinition } from './shared/get_slot_definition';
+import { get_slot_definition } from './shared/get_slot_definition';
 import { b, x } from 'code-red';
 import { sanitize } from '../../../utils/names';
 import { Identifier, Node } from 'estree';

src/compiler/compile/render_dom/wrappers/SlotTemplateIfBlock.ts

@@ -17,7 +17,7 @@ export default class SlotTemplateIfBlockWrapper extends Wrapper {
 	children: Array<SlotTemplateWrapper | SlotTemplateIfBlockWrapper> = [];
 	else: Array<SlotTemplateWrapper | SlotTemplateIfBlockWrapper> = [];
 	parent: SlotTemplateIfBlockWrapper | InlineComponentWrapper;
-	scope: TemplateScope
+	scope: TemplateScope;
 
 	constructor(
 		renderer: Renderer,

src/compiler/compile/render_dom/wrappers/shared/slots.ts

@@ -1,7 +1,7 @@
-import Renderer from "../../Renderer";
+import Renderer from '../../Renderer';
-import SlotTemplateWrapper from "../SlotTemplate";
+import SlotTemplateWrapper from '../SlotTemplate';
-import SlotTemplateIfBlockWrapper from "../SlotTemplateIfBlock";
+import SlotTemplateIfBlockWrapper from '../SlotTemplateIfBlock';
-import is_dynamic from "./is_dynamic";
+import is_dynamic from './is_dynamic';
 
 export function collect_slot_fragment_dependencies(
 	renderer: Renderer,
@@ -49,4 +49,4 @@ export function collect_slot_dynamic_dependencies(children: Array<SlotTemplateIf
 	collect(children);
 
 	return result;
-}
+}

src/compiler/compile/render_ssr/Renderer.ts

@@ -10,12 +10,13 @@ import InlineComponent from './handlers/InlineComponent';
 import KeyBlock from './handlers/KeyBlock';
 import Slot from './handlers/Slot';
 import SlotTemplate from './handlers/SlotTemplate';
+import SlotTemplateIfBlock from './handlers/SlotTemplateIfBlock';
 import Tag from './handlers/Tag';
 import Text from './handlers/Text';
 import Title from './handlers/Title';
 import { AppendTarget, CompileOptions } from '../../interfaces';
 import { INode } from '../nodes/interfaces';
-import { Expression, TemplateLiteral, Identifier } from 'estree';
+import { Expression, TemplateLiteral, Identifier, Node } from 'estree';
 import { collapse_template_literal } from '../utils/collapse_template_literal';
 import { escape_template } from '../utils/stringify';
 
@@ -39,6 +40,7 @@ const handlers: Record<string, Handler> = {
 	RawMustacheTag: HtmlTag,
 	Slot,
 	SlotTemplate,
+	SlotTemplateIfBlock,
 	Text,
 	Title,
 	Window: noop
@@ -47,6 +49,7 @@ const handlers: Record<string, Handler> = {
 export interface RenderOptions extends CompileOptions{
 	locate: (c: number) => { line: number; column: number };
 	head_id?: string;
+	slot_scopes?: Array<Node[] | Node>;
 }
 
 export default class Renderer {

src/compiler/compile/render_ssr/handlers/InlineComponent.ts

@@ -66,27 +66,20 @@ export default function(node: InlineComponent, renderer: Renderer, options: Rend
 				: node.name.split('.').reduce(((lhs, rhs) => x`${lhs}.${rhs}`) as any)
 	);
 
-	const slot_fns = [];
+	const slot_scopes = [];
 
 	const children = node.children;
-
 	if (children.length) {
-		const slot_scopes = new Map();
-
 		renderer.render(children, Object.assign({}, options, {
 			slot_scopes
 		}));
-
-		slot_scopes.forEach(({ input, output, statements }, name) => {
-			slot_fns.push(
-				p`${name}: (${input}) => { ${statements}; return ${output}; }`
-			);
-		});
 	}
 
-	const slots = x`{
+	const slots = x`(() => {
-		${slot_fns}
+		const #slots_definition = {};
-	}`;
+		${slot_scopes}
+		return #slots_definition;
+	})()`;
 
 	if (node.css_custom_properties.length > 0) {
 		if (node.namespace === namespaces.svg) {

src/compiler/compile/render_ssr/handlers/Slot.ts

@@ -1,12 +1,10 @@
 import Renderer, { RenderOptions } from '../Renderer';
 import Slot from '../../nodes/Slot';
-import { x } from 'code-red';
+import { x, b } from 'code-red';
 import get_slot_data from '../../utils/get_slot_data';
 import { get_slot_scope } from './shared/get_slot_scope';
 
-export default function(node: Slot, renderer: Renderer, options: RenderOptions & {
+export default function(node: Slot, renderer: Renderer, options: RenderOptions) {
-	slot_scopes: Map<any, any>;
-}) {
 	const slot_data = get_slot_data(node.values);
 	const slot = node.get_static_attribute_value('slot');
 	const nearest_inline_component = node.find_nearest(/InlineComponent/);
@@ -32,9 +30,9 @@ export default function(node: Slot, renderer: Renderer, options: RenderOptions &
 		nearest_inline_component.lets.forEach(l => {
 			if (!seen.has(l.name.name)) lets.push(l);
 		});
-		options.slot_scopes.set(slot, {
+
-			input: get_slot_scope(node.lets),
+		options.slot_scopes.push(b`#slots_definition['${node.slot_template_name}'] = 
-			output: renderer.pop()
+			(${get_slot_scope(node.lets)}) => ${renderer.pop()};
-		});
+		`);
 	}
 }

src/compiler/compile/render_ssr/handlers/SlotTemplate.ts

@@ -4,11 +4,11 @@ import remove_whitespace_children from './utils/remove_whitespace_children';
 import { get_slot_scope } from './shared/get_slot_scope';
 import InlineComponent from '../../nodes/InlineComponent';
 import { get_const_tags } from './shared/get_const_tags';
+import { x } from 'code-red';
+import { INode } from '../../nodes/interfaces';
 
-export default function(node: SlotTemplate, renderer: Renderer, options: RenderOptions & {
+export default function(node: SlotTemplate, renderer: Renderer, options: RenderOptions) {
-	slot_scopes: Map<any, any>;
+	const parent_inline_component = get_parent_inline_component(node.parent);
-}) {
-	const parent_inline_component = node.parent as InlineComponent;
 	const children = remove_whitespace_children(node instanceof SlotTemplate ? node.children : [node], node.next);
 
 	renderer.push();
@@ -22,18 +22,9 @@ export default function(node: SlotTemplate, renderer: Renderer, options: RenderO
 
 	const slot_fragment_content = renderer.pop();
 	if (!is_empty_template_literal(slot_fragment_content)) {
-		if (options.slot_scopes.has(node.slot_template_name)) {
+		options.slot_scopes.push(x`#slots_definition['${node.slot_template_name}'] = 
-			if (node.slot_template_name === 'default') {
+			(${get_slot_scope(node.lets)}) => { ${get_const_tags(node.const_tags)}; return ${slot_fragment_content}; }
-				throw new Error('Found elements without slot attribute when using slot="default"');
+		`);
-			}
-			throw new Error(`Duplicate slot name "${node.slot_template_name}" in <${parent_inline_component.name}>`);
-		}
-
-		options.slot_scopes.set(node.slot_template_name, {
-			input: get_slot_scope(node.lets),
-			output: slot_fragment_content,
-			statements: get_const_tags(node.const_tags)
-		});
 	}
 }
 
@@ -44,3 +35,11 @@ function is_empty_template_literal(template_literal) {
 		template_literal.quasis[0].value.raw === ''
 	);
 }
+
+function get_parent_inline_component(node: INode) {
+	let parent = node;
+	while (parent.type !== 'InlineComponent') {
+		parent = parent.parent;
+	}
+	return parent as InlineComponent;
+}

src/compiler/compile/render_ssr/handlers/SlotTemplateIfBlock.ts

@@ -0,0 +1,29 @@
+import Renderer, { RenderOptions } from '../Renderer';
+import { b } from 'code-red';
+import SlotTemplateIfBlock from '../../nodes/SlotTemplateIfBlock';
+import { flatten } from '../../../utils/flatten';
+
+export default function (node: SlotTemplateIfBlock, renderer: Renderer, options: RenderOptions) {
+	const if_slot_scopes = [];
+	renderer.render(node.children, Object.assign({}, options, {
+		slot_scopes: if_slot_scopes
+	}));
+
+	if (node.else) {
+		const else_slot_scopes = [];
+		renderer.render(node.else.children, Object.assign({}, options, {
+			slot_scopes: else_slot_scopes
+		}));
+		options.slot_scopes.push(b`
+			if (${node.expression.node}) {
+				${if_slot_scopes}
+			} else {
+				${else_slot_scopes}
+			}
+		`);
+	} else {
+		options.slot_scopes.push(b`if (${node.expression.node}) {
+			${flatten(if_slot_scopes)}
+		}`);
+	}
+}

src/runtime/internal/utils.ts

@@ -133,7 +133,8 @@ export function create_slot(definition_index: number, definition_name: string, $
 		i: (local) => transition_in(slot_block, local),
 		o: (local) => transition_out(slot_block, local),
 		d: (detaching) => slot_block && slot_block.d(detaching),
-	}
+		l: (nodes) => slot_block && slot_block.l(nodes)
+	};
 
 	init();
 	return slot;
@@ -184,7 +185,8 @@ export function create_slot_with_fallback(definition_index: number, definition_n
 		i: (local) => transition_in(slot_or_fallback, local),
 		o: (local) => transition_out(slot_or_fallback, local),
 		d: (detaching) => slot_or_fallback.d(detaching),
-	}
+		l: (nodes) => slot_or_fallback.l(nodes)
+	};
 
 	init();
 	return slot;

test/helpers.ts

@@ -207,7 +207,6 @@ export function addLineNumbers(code) {
 }
 
 export function showOutput(cwd, options = {}, compile = svelte.compile) {
-	return;
 	glob('**/*.svelte', { cwd }).forEach(file => {
 		if (file[0] === '_') return;
 

test/runtime/samples/component-dynamic-slot-1/_config.js

@@ -1,7 +1,4 @@
 export default {
-	solo: true,
-	skip_if_ssr: true,
-	skip_if_hydrate: true,
 	html: '<p>Fallback</p>',
 	test({ assert, component, target }) {
 		component.value = 1;

test/runtime/samples/component-dynamic-slot-2/_config.js

@@ -1,7 +1,4 @@
 export default {
-	solo: true,
-	skip_if_ssr: true,
-	skip_if_hydrate: true,
 	html: `
 		<div>Slot A</div>
 		4A

test/runtime/samples/component-dynamic-slot-3/_config.js

@@ -1,7 +1,4 @@
 export default {
-	solo: true,
-	skip_if_ssr: true,
-	skip_if_hydrate: true,
 	html: `
 		<div id="_">
 			value: _
@@ -26,7 +23,7 @@ export default {
 	test({ assert, component, target }) {
 		const lvl1 = target.querySelector('#a');
 		const lvl2 = target.querySelector('#b');
-		component.paths = ["x", "y", "z"];
+		component.paths = ['x', 'y', 'z'];
 		assert.htmlEqual(target.innerHTML, `
 			<div id="_">
 			value: _
@@ -57,9 +54,8 @@ export default {
 
 		assert.equal(lvl1, target.querySelector('#x'));
 		assert.equal(lvl2, target.querySelector('#y'));
-		const lvl3 = target.querySelector('#z');
 	
-		component.paths = ["p"];
+		component.paths = ['p'];
 		assert.htmlEqual(target.innerHTML, `
 			<div id="_">
 			value: _

test/runtime/samples/component-dynamic-slot-4/_config.js

@@ -1,8 +1,5 @@
 export default {
-	solo: true,
+	html: 'a',
-	skip_if_ssr: true,
-	skip_if_hydrate: true,
-	html: `a`,
 	test({ assert, component, target }) {
 		component.a = 'foo';
 		assert.htmlEqual(target.innerHTML, 'foo');

test/runtime/samples/component-dynamic-slot-5/_config.js

@@ -1,7 +1,4 @@
 export default {
-	solo: true,
-	skip_if_ssr: true,
-	skip_if_hydrate: true,
 	html: `
 		<div>
 			Top content
@@ -24,5 +21,5 @@ export default {
 			<hr>
 			bottom fallback
 		</div>
-	`,
+	`
 };

test/runtime/samples/component-dynamic-slot-6/_config.js

@@ -1,7 +1,4 @@
 export default {
-	solo: true,
-	skip_if_ssr: true,
-	skip_if_hydrate: true,
 	html: `
 		top fallback
 		<hr>

test/runtime/samples/component-slot-nested-in-slot/_config.js

@@ -1,4 +1,5 @@
 export default {
+	solo:true,
 	html: `
 		<p slot='one'>one: 1 two: 2</p>
 	`,

test/runtime/samples/component-slot-slot/_config.js

@@ -1,3 +1,4 @@
 export default {
+	solo:true,
 	html: '<div><span>lol</span></div>'
 };