nl_tokens: return the config box or choose the right one according to the src
pl_tokens: function getLegalBox ( _ref ) { var src = _ref . src , box = _ref . box ; if ( isString ( <mask> ) && box ) return box ; src = src . toLowerCase ( ) ; for ( var key in boxSuffixMap ) { var suffix = boxSuffixMap [ key ] ; if ( src . indexOf ( suffix ) > - 1 ) return key ; } return 'native' ; }