Lex/Yacc (Flex/Bison): Obtaining a list of the next possible tokens for auto-complete feature

"Chris Hundhausen" <hundhaus@hawaii.edu>
13 Oct 2002 16:22:12 -0400

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Lex/Yacc (Flex/Bison): Obtaining a list of the next possible tokens f hundhaus@hawaii.edu (Chris Hundhausen) (2002-10-13)
Re: Lex/Yacc (Flex/Bison): Obtaining a list of the next possible token gordan.sikic@inet.hr (Gordan Sikic) (2002-10-18)
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From: "Chris Hundhausen" <hundhaus@hawaii.edu>
Newsgroups: comp.lang.c++,comp.compilers
Date: 13 Oct 2002 16:22:12 -0400
Organization: http://groups.google.com/
Keywords: parse, question
Posted-Date: 13 Oct 2002 16:22:11 EDT

I'm building an interactive development environment (IDE) with
auto-complete and syntax highlighting. I used flex and bison to
construct the parser for the language supported by my IDE.


To support autocomplete, I need a function that accepts a partial
sentence of my language, and returns a list of the next possible
tokens. I'm unaware of any way to obtain such a list with flex/bison
(lex/yacc).


Is there anyone out there who has done this and could give me some
advice? I've heard that ANTLR has this functionality, but I'd prefer
not to convert to ANTLR unless I have to. (If you'd done this in
ANTLR, please respond too, because I may have to convert to ANTLR if
flex/bison won't do the job.)


Thanks in advance,


:-)Chris
[As I recall, it's just barely possible in yacc by decoding the parse
state tables, although the default reductions make it harder. -John]


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