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import type { Helper, Site } from "../core.ts";
const escapeChars: Record<string, string> = {  "&": "&amp;",  "<": "&lt;",  ">": "&gt;",  '"': "&#34;",  "'": "&#39;",};
/** * A plugin to register the filters "attrs" and "class", * which allow to handle HTML attributes and class names easily */export default function () {  return (site: Site) => {    site.filter("attr", attributes as Helper);    site.filter("class", className);  };}
export function attributes(values: unknown, ...validNames: string[]) {  const attributes = new Map();
  handleAttributes(attributes, values, validNames);
  return joinAttributes(attributes);}
export function className(...names: unknown[]) {  const classes = new Set<string>();
  names.forEach((name) => handleClass(classes, name));
  return Array.from(classes).join(" ");}
function handleClass(classes: Set<string>, name: unknown): void {  if (!name) {    return;  }
  if (typeof name === "string") {    classes.add(name);    return;  }
  if (Array.isArray(name)) {    return name.forEach((value) => handleClass(classes, value));  }
  for (const [key, value] of Object.entries(name as Record<string, unknown>)) {    if (value) {      classes.add(key);    }  }}
function handleAttributes(  attributes: Map<string, unknown>,  name: unknown,  validNames: string[],): void {  if (!name) {    return;  }
  if (typeof name === "string") {    if (isValid(name, validNames)) {      attributes.set(name, true);    }    return;  }
  if (Array.isArray(name)) {    return name.forEach((value) =>      handleAttributes(attributes, value, validNames)    );  }
  for (const [key, value] of Object.entries(name as Record<string, unknown>)) {    if (!isValid(key, validNames)) {      continue;    }
    if (key === "class") {      const classList = (attributes.get("class") || new Set()) as Set<string>;      handleClass(classList, value);      attributes.set("class", classList);      continue;    }
    attributes.set(key, value);  }}
function joinAttributes(attributes: Map<string, unknown>) {  const values = [];
  for (const [name, value] of attributes) {    if (value === undefined || value === null || value === false) {      continue;    }
    if (value === true) {      values.push(name);      continue;    }
    if (value instanceof Set) {      if (value.size) {        values.push(`${name}="${escape(Array.from(value).join(" "))}"`);      }      continue;    }
    values.push(`${name}="${escape(value as string)}"`);  }
  return values.join(" ");}
function escape(value: string) {  return value.replace(/[&<>'"]/g, (match) => escapeChars[match]);}
function isValid(name: string, validNames: string[]) {  return name && (!validNames.length || validNames.includes(name));}