There is a lot of saving and code-reuse possible if multiple entry points are   
   allowed in a parser generator. This can be done by a simple extension of the   
   LR process, but does complicate the issue of end-markers a little.   
      
   You'll see brief mention of it, by the way, here on page 199 of the Lex and   
   Yacc reference. https://books.google.com/books?id=vsHcnR4kXIAC&p   
   =PA199&lpg=PA199 authored by (... searching author page ...) Oh! The   
   moderator, John!   
      
   [I put the same trick on pp 163-164 of flex&bison.  Fiddle the lexer   
   so it sends the parser a fake token when it starts and use initial   
   rules with the fake token to select the real entry point.  That works   
   in plain yacc or bison.  -John]   
      
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