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Problem with empty terminals #149

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sirdude opened this issue Jul 2, 2015 · 2 comments
Closed

Problem with empty terminals #149

sirdude opened this issue Jul 2, 2015 · 2 comments
Milestone
2.8.1

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@sirdude
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sirdude commented Jul 2, 2015

The following grammar works with bnfc -c or --cpp but does not build with haskell

Prog. Program ::= Defin ;
Pe. Program ::= "" ;
Def. Defin ::= "woo" ;

It will generate files but when trying to make I get the following:
% make
happy -gca ParTest.y
alex -g LexTest.x
LexTest.x:25:3: parse error
@gdetrez
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gdetrez commented Jul 3, 2015

BNFC chokes on empty terminals. If you want an empty production do this instead:

Prog. Program ::= Defin ;
Pe. Program ::= ;
Def. Defin ::= "woo" ;

@gdetrez
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gdetrez commented Jul 3, 2015

Fixed in a3a4149.

@gdetrez gdetrez closed this as completed Jul 3, 2015
@andreasabel andreasabel added this to the 2.8.1 milestone Nov 4, 2018
@andreasabel andreasabel changed the title Problem with haskell version of bnfc Problem with empty terminals Nov 4, 2018
@bafain bafain mentioned this issue Nov 14, 2018
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@gdetrez @sirdude @andreasabel