context: function PR_lexOne(s) {  var chunks = PR_chunkify(s);  // treat it as markup if the first non whitespace character is a < and the  // last non-whitespace character is a >  var isMarkup = false;  for (var i = 0; i < chunks.length; ++i) {    if (PR_PLAIN == chunks[i].style) {      if (PR_startsWith(PR_trim(chunks[i].token), '&lt;')) {        for (var j = chunks.length; --j >= 0;) {          if (PR_PLAIN == chunks[j].style) {            isMarkup = PR_endsWith(PR_trim(chunks[j].token), '&gt;');            break;          }        }      }      break;    }  }  return isMarkup ? PR_lexMarkup(chunks) : PR_lexSource(chunks);}
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