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BNFC does not allow empty declarations in .cf files #215

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andreasabel opened this issue Nov 24, 2017 · 1 comment
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BNFC does not allow empty declarations in .cf files #215

andreasabel opened this issue Nov 24, 2017 · 1 comment
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@andreasabel
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enhancement LBNF Concerning the LBNF syntax and its checking
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2.8.2

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@andreasabel
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BNFC (haskell) accepts totally empty input files, but not

;

It should also allow empty declarations consisting just of a ;.
This would allow a style like

-- comment
; Rule. S ::= P
-- comment
; Rule2. S ::= Q

where semicolons are aligned at the first column.
@andreasabel
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This can be fixed by defining custom Def lists with the extra rule:

_. [Def] ::= ";" [Def] ;

@andreasabel andreasabel added this to the 2.8.2 milestone Jan 1, 2018
@andreasabel andreasabel self-assigned this Jan 1, 2018
@andreasabel andreasabel added the LBNF Concerning the LBNF syntax and its checking label Nov 22, 2020
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enhancement LBNF Concerning the LBNF syntax and its checking
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