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export type HProps = Record<string, string> | null | undefined;
export type HChild = string | undefined | (() => string);
export type AstroComponent = (props: HProps, ...children: Array<HChild>) => string;
export type HTag = string | AstroComponent;
const voidTags = new Set(['area', 'base', 'br', 'col', 'command', 'embed', 'hr', 'img', 'input', 'keygen', 'link', 'meta', 'param', 'source', 'track', 'wbr']);
/** Generator for primary h() function */
function* _h(tag: string, attrs: HProps, children: Array<HChild>) {
if (tag === '!doctype') {
yield '<!doctype ';
if (attrs) {
yield Object.keys(attrs).join(' ');
}
yield '>';
return;
}
yield `<${tag}`;
if (attrs) {
yield ' ';
for (let [key, value] of Object.entries(attrs)) {
yield `${key}="${value}"`;
}
}
yield '>';
// Void tags have no children.
if (voidTags.has(tag)) {
return;
}
for (let child of children) {
// Special: If a child is a function, call it automatically.
// This lets you do {() => ...} without the extra boilerplate
// of wrapping it in a function and calling it.
if (typeof child === 'function') {
yield child();
} else if (typeof child === 'string') {
yield child;
} else if (!child) {
// do nothing, safe to ignore falsey values.
} else {
yield child;
}
}
yield `</${tag}>`;
}
/** Astro‘s primary h() function. Allows it to use JSX-like syntax. */
export async function h(tag: HTag, attrs: HProps, ...pChildren: Array<Promise<HChild>>) {
const children = await Promise.all(pChildren.flat(Infinity));
if (typeof tag === 'function') {
// We assume it's an astro component
return tag(attrs, ...children);
}
return Array.from(_h(tag, attrs, children)).join('');
}
/** Fragment helper, similar to React.Fragment */
export function Fragment(_: HProps, ...children: Array<string>) {
return children.join('');
}
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