/* Used for generating cross-references within the DOM documentation. */
/* This will first try to link to DOM/$0, then DOM:$0 if that doesn't exist */
/* if you specify the API name with parens (ie, "foo()"), the link is to */
/* lang/DOM/foo but the title is displayed as "foo()" to make it clear it's */
/* a function */
/* @param */
/*   The path of the page to link to, relative to the DOM documentation path. */
/* @param [optional] */
/*   The text to use for the link.  If omitted, the value of the first */
/*   parameter will be used */
/* @param [optional] */
/*   An anchor to link to on the page. Link text will display as $0.$2 or $1.$2 */

/* get a page's language (Don't use page.language!) */
var uri = Uri.Parts(Page.uri);
var lang = string.toLower(uri.path[0]);
if(string.Contains(lang, "project")) {
  let lang = string.Substr(lang, 8);
}
/* fall back to page.language on a user page */
else if (string.StartsWith(lang, "user:")) {
  let lang = page.language;
}

var api = $0;
var str = $0;

if ($1 && string.IsLetter($1)) {
  let str = $1;
}

if (string.endswith($0, '()')) {
  let api = string.remove(api, string.length(api) - 2);
}

var destOldType = lang .. '/' .. 'DOM:' .. api;
var destNewType = lang .. '/' .. 'DOM/' .. api;
var destEng = 'en' .. '/' .. 'DOM/' .. api;
var anch = '';

if ($2) {
  let str = str .. '.' .. $2;
  let anch = '#' .. $2;
}
if(wiki.pageExists(destNewType)) { /* the page exists from the dekiwiki age */
  <code>(web.link(wiki.uri(destNewType) .. anch,str))</code>;
} else if (wiki.pageExists(destOldType)) { /* the page exists from the mediawiki age */
  <code>(web.link(wiki.uri(destOldType) .. anch,str))</code>;
} else if (lang == 'zh_tw' && wiki.pageExists(destEng)){  
  /* the MozTW community consider links to English pages better than red ones. 
     I'll write about this to mozilla.dev.mdc later */ 
  <code>(web.link(wiki.uri(destEng) .. anch,str))</code>;
} else { /* the page doesn't exist */
  var targeturi = "https://developer.mozilla.org/Article_not_found?uri=" .. destNewType;
  <code><a rel=('internal') href=(targeturi) class=('new')>(str)</a></code>;
}