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type ComponentMetadata,
type StructureMetadata,
type SlotMetadata,
PropMetadata,
ComposedComponentMetadata,
} from '@fds-uif/generator-base';
import { serialize, defaultTreeAdapter, html } from 'parse5';
import type { DefaultTreeAdapterMap, Token } from 'parse5';
import { uppercaseFirstChar } from './utils/uppercaseFirstChar.js';
import { kebabCase } from './utils/kebabCase.js';
import { buildClassGetterPlan, type ClassGetterPlan } from './utils/classGetterPlan.js';
import { buildRenderWhenPlan, type RenderWhenPlan } from './utils/renderWhenPlan.js';
const NS = html.NS;
const treeAdapter = defaultTreeAdapter;
interface TemplateCtx {
classPlan: ClassGetterPlan;
rwPlan: RenderWhenPlan;
props: PropMetadata[];
}
function createDocument() {
const document = treeAdapter.createDocument();
const templateElement = treeAdapter.createElement(
'template',
NS.HTML,
[],
) as DefaultTreeAdapterMap['template'];
const templateContent = treeAdapter.createDocumentFragment();
treeAdapter.setTemplateContent(templateElement, templateContent);
treeAdapter.appendChild(document, templateElement);
return { document, template: templateContent };
}
const isSlotChild = (c: unknown): c is SlotMetadata => !!c && (c as SlotMetadata).type === 'slot';
const isComposedChild = (c: unknown): c is ComposedComponentMetadata =>
!!c && (c as ComposedComponentMetadata).type === 'component';
function classAttrFor(
node: StructureMetadata | ComposedComponentMetadata,
ctx: TemplateCtx,
isRoot: boolean,
): { name: 'class'; value: string } | null {
// Dynamic root binding wins.
if (isRoot && ctx.classPlan.rootGetterName) {
return { name: 'class', value: `{${ctx.classPlan.rootGetterName}}` };
}
// Dynamic non-root binding.
const dynamic = ctx.classPlan.nodes.get(node);
if (dynamic) return { name: 'class', value: `{${dynamic.name}}` };
// Static class on structure nodes only (composed have their own props.static).
if (!isComposedChild(node)) {
const cls = (node as StructureMetadata).attributes?.class;
if (Array.isArray(cls)) return { name: 'class', value: cls.join(' ') };
if (typeof cls === 'string' && cls.length > 0) return { name: 'class', value: cls };
}
return null;
}
function staticAttrsFor(node: StructureMetadata, ctx: TemplateCtx, isRoot: boolean): Token.Attribute[] {
const out: Token.Attribute[] = [];
for (const [attribute, value] of Object.entries(node.attributes)) {
if (attribute === 'class') continue; // class handled separately
Iif (Array.isArray(value)) {
out.push({ name: attribute, value: value.join(' ') } as Token.Attribute);
} else {
out.push({ name: attribute, value: String(value) } as Token.Attribute);
}
}
const classAttr = classAttrFor(node, ctx, isRoot);
if (classAttr) out.push(classAttr as Token.Attribute);
return out;
}
function boundAttrsFor(node: StructureMetadata, ctx: TemplateCtx): Token.Attribute[] {
return (node.boundAttributes ?? [])
.map((api) => {
const known = ctx.props.find((p) => p.name === api.prop);
Iif (!known) return null;
return { name: api.attribute, value: `{${known.name}}` } as Token.Attribute;
})
.filter((x): x is Token.Attribute => x !== null);
}
function composedAttrsFor(node: ComposedComponentMetadata, ctx: TemplateCtx): Token.Attribute[] {
const out: Token.Attribute[] = [];
const { static: staticProps, bound, forwarded } = node.props ?? {};
if (staticProps) {
for (const [k, v] of Object.entries(staticProps)) {
Iif (Array.isArray(v)) {
out.push({ name: kebabCase(k), value: v.join(' ') });
} else if (typeof v === 'boolean') {
Eif (v) out.push({ name: kebabCase(k), value: '' });
} else E{
out.push({ name: kebabCase(k), value: String(v) });
}
}
}
if (bound) {
for (const [propName, source] of Object.entries(bound)) {
const sourceProp = typeof source === 'string' ? source : propName;
out.push({ name: kebabCase(propName), value: `{${sourceProp}}` });
}
}
if (forwarded) {
for (const propName of forwarded) {
out.push({ name: kebabCase(propName), value: `{${propName}}` });
}
}
const classAttr = classAttrFor(node, ctx, false);
Iif (classAttr) out.push(classAttr as Token.Attribute);
return out;
}
function wrapWithRenderWhen(
parent: DefaultTreeAdapterMap['parentNode'],
node: StructureMetadata | ComposedComponentMetadata,
ctx: TemplateCtx,
): DefaultTreeAdapterMap['parentNode'] {
const binding = ctx.rwPlan.bindings.get(node);
if (!binding) return parent;
const tpl = treeAdapter.createElement('template', NS.HTML, [
{ name: 'lwc:if', value: `{${binding.expression}}` },
]) as DefaultTreeAdapterMap['template'];
const frag = treeAdapter.createDocumentFragment();
treeAdapter.setTemplateContent(tpl, frag);
treeAdapter.appendChild(parent, tpl);
return frag;
}
function appendComposed(
parent: DefaultTreeAdapterMap['parentNode'],
node: ComposedComponentMetadata,
ctx: TemplateCtx,
): void {
const host = wrapWithRenderWhen(parent, node, ctx);
const tag = `c-${kebabCase(node.component)}`;
const el = treeAdapter.createElement(tag, NS.HTML, composedAttrsFor(node, ctx));
treeAdapter.appendChild(host, el);
}
function appendStructure(
parent: DefaultTreeAdapterMap['parentNode'],
node: StructureMetadata,
ctx: TemplateCtx,
isRoot: boolean,
): void {
if (node.element) {
const host = wrapWithRenderWhen(parent, node, ctx);
const newElement = treeAdapter.createElement(node.element, NS.HTML, [
...staticAttrsFor(node, ctx, isRoot),
...boundAttrsFor(node, ctx),
]);
treeAdapter.appendChild(host, newElement);
createChildren(newElement, node.children, ctx);
} else Eif (node.conditionals && node.conditionals.length > 0) {
node.conditionals.forEach((condition) => {
const lwcCondition = condition.condition
.split(' || ')
.map((x) => uppercaseFirstChar(x))
.join('Or');
const tpl = treeAdapter.createElement('template', NS.HTML, [
{ name: 'lwc:if', value: `{hasSlot${lwcCondition}}` },
]) as DefaultTreeAdapterMap['template'];
const frag = treeAdapter.createDocumentFragment();
treeAdapter.setTemplateContent(tpl, frag);
treeAdapter.appendChild(parent, tpl);
createChildren(frag, [condition.trueBranch], ctx);
});
}
}
function createChildren(
parent: DefaultTreeAdapterMap['parentNode'],
children: (SlotMetadata | StructureMetadata | ComposedComponentMetadata)[] | undefined,
ctx: TemplateCtx,
): void {
if (!children || children.length === 0) return;
for (const child of children) {
if (isSlotChild(child)) {
Iif (parent.nodeName === 'svg') {
throw new Error('LWC does not support svg>slot nesting');
}
const attrs = child.name === 'default' ? [] : [{ name: 'name', value: child.name }];
treeAdapter.appendChild(parent, treeAdapter.createElement('slot', NS.HTML, attrs));
} else if (isComposedChild(child)) {
appendComposed(parent, child, ctx);
} else {
appendStructure(parent, child, ctx, false);
}
}
}
export function generateTemplate(metadata: ComponentMetadata): string {
const ctx: TemplateCtx = {
classPlan: buildClassGetterPlan(metadata),
rwPlan: buildRenderWhenPlan(metadata),
props: metadata.props,
};
const { document, template } = createDocument();
// Emit the root. The root may itself be a composed component (analyzer
// returns a ComposedComponentMetadata in that case).
const root = metadata.structure as unknown as StructureMetadata | ComposedComponentMetadata;
if (isComposedChild(root)) {
appendComposed(template, root, ctx);
} else {
appendStructure(template, root, ctx, true);
}
let raw = serialize(document);
// Convert ="{ident}" to ={ident} for LWC-style attribute bindings.
raw = raw.replace(/="(\{[^"}]+\})"/g, '=$1');
return raw;
}
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