Yacc with multiple entry points.

Mon, 9 Dec 2019 16:13:06 -0800 (PST)

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Yacc with multiple entry points. rockbrentwood@gmail.com (2019-12-09)
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From: rockbrentwood@gmail.com
Newsgroups: comp.compilers
Date: Mon, 9 Dec 2019 16:13:06 -0800 (PST)
Organization: Compilers Central
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Keywords: yacc, parse, comment
Posted-Date: 10 Dec 2019 13:23:10 EST

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&pg=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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