nl_tokens: Helper for jison grammar definitions altering new calls to the yy namepsace and assigning action results to $$
pl_tokens: function o ( patternString , action ) { if ( typeof <mask> === 'undefined' ) { return [ patternString , '$$ = $1;' ] ; } action = action . replace ( / \bnew  / g , '$&yy.' ) ; return [ patternString , '$$ = ' + action + ';' ] ; }