nl_tokens: Pops the current meta off the stack optionally checking that the classname is correct
pl_tokens: function ( className ) { if ( ! this . __metaStack . length ) { throw new Error ( "No __metaStack entries to pop" ) ; } let meta = this . __metaStack [ this . __metaStack . length - 1 ] ; if ( className && meta . className != className ) { throw <mask> Error ( "Wrong __metaStack entries to pop, expected " + className + " found " + meta . className ) ; } this . __metaStack . pop ( ) ; meta = this . __metaStack [ this . __metaStack . length - 1 ] || null ; this . __classMeta = meta ; }