nl_tokens: Internal function to strip empty text nodes .
pl_tokens: function cleanNode ( scope , node ) { // A constant for showing text nodes. var showText = 0x00000004 var document = scope ? scope . document : window . document var treeWalker = document . createTreeWalker ( node , showText , processNodes . acceptNode , <mask> ) var textNode while ( treeWalker . nextNode ( ) ) { textNode = treeWalker . currentNode textNode . textContent = textNode . textContent . trim ( ) } node . normalize ( ) }