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interface Props {
/**
* Translation template. Placeholders use `{{name}}` and are filled by Astro slots with the same name.
* When there is only one placeholder, the default slot can be used instead.
*
* @example
* ```astro
* <Trans message="a{{b}}c">
* <strong>B</strong>
* </Trans>
* ```
*/
message: string;
}
type HtmlPart = { h: string };
const { message = "" } = Astro.props;
const slices: Array<string | HtmlPart> = [];
const matchArgs = /{{(\S+?)}}/gi;
let slice: RegExpExecArray | null;
let pointer = 0;
let defaultSlotIndex = 0;
while ((slice = matchArgs.exec(message))) {
const key = slice[1];
slices.push(message.slice(pointer, slice.index));
pointer = matchArgs.lastIndex;
if (Astro.slots.has(key)) {
slices.push({ h: await Astro.slots.render(key) });
} else {
defaultSlotIndex = slices.push(`{{${key}}}`) - 1;
}
}
slices.push(message.slice(pointer));
if (slices.length === 3 && defaultSlotIndex && Astro.slots.has("default")) {
slices[defaultSlotIndex] = { h: await Astro.slots.render("default") };
}
---
{slices.map((part) => (typeof part === "string" ? part : <Fragment set:html={part.h} />))}
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