nl_tokens: Reads a use statement ebnf use_alias :: = ( T_AS T_STRING ) ?
pl_tokens: function ( ) { let result = null ; if ( this . token === this . tok . T_AS ) { if ( this . next ( ) . expect ( this . tok . T_STRING ) ) { const aliasName = this . node ( "identifier" ) ; const name = this . text ( ) ; this . <mask> ( ) ; result = aliasName ( name ) ; } } return result ; }