Comments (5)
We have forked bnfc and added some support (https://github.com/juodaspaulius/bnfc/). If there's interest we could guard these extension using a new command line parameter (e.g., --positions
) and contribute back.
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I don't think that you can access the position of any node excepts token defined with the position
keyword.
It could maybe be added as an option...
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That would be valuable.
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What we have to do currently, to address the issue is to introduce a bunch of internal constructions but these pollute our code badly....
in the original .cf
file you'd have
Module. Module ::= [Declaration] ;
but we add
Module . Module ::= [Declaration];
internal PosModule . Module ::= Span [Declaration];
where the Span
is a section of the input file, i.e., ( (x1, y1), (x2, y2) ):
Pos . Pos ::= Integer Integer ;
internal PosPos . Pos ::= Span Integer Integer ;
Span . Span ::= Pos Pos ;
internal PosSpan . Span ::= Span Pos Pos ;
The nasty consequence is that in all our functions which work with AST nodes, we always have to pattern match on the original constructors (Module
) and the new ones with positions (PosModule
).
It is a nasty hack that adds up a lot programming and maintenance cost.
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What we could have is a function which computes a span from the
position-tokens within it.
On Wed, Jun 12, 2013 at 10:59 PM, Michal Antkiewicz <
[email protected]> wrote:
What we have to do currently, to address the issue is to introduce a bunch
of internal constructions but these pollute our code badly....in the original .cf file you'd have
Module. Module ::= [Declaration] ;
but we add
Module . Module ::= [Declaration];
internal PosModule . Module ::= Span [Declaration];where the Span is a section of the input file, i.e., ( (x1, y1), (x2, y2)
):Pos . Pos ::= Integer Integer ;
internal PosPos . Pos ::= Span Integer Integer ;
Span . Span ::= Pos Pos ;
internal PosSpan . Span ::= Span Pos Pos ;The nasty consequence is that in all our functions which work with AST
nodes, we always have to pattern match on the original constructors (
Module) and the new ones with positions (PosModule).It is a nasty hack that adds up a lot programming and maintenance cost.
—
Reply to this email directly or view it on GitHubhttps://github.com//issues/28#issuecomment-19355141
.
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Related Issues (20)
- Weird special behavior of layout resolution at beginning of file
- Error location missing with recent `menhir` (starting with 2021-12-30 release) HOT 1
- `bnfc-system-tests` does not build with `HTF-0.15`
- command line parameter to omit built-in lexical elements? HOT 2
- Another `non-exhaustive case` in generated layout code HOT 2
- Generate syntax highlighters HOT 4
- Haskell: errors as record types HOT 2
- Build testsuites with GHC 9.4 HOT 2
- Parse error should close layout block
- Issue in Makefile of Haskell parser HOT 6
- Get rid of custom setup and `cabal-doctest` dependency
- bnfc 2.9.4 does not build with ventura m1 HOT 4
- Generated C++ parser does not allow whitespace to be a token HOT 3
- Release 2.9.4.1
- Where do I get grammars :P HOT 7
- Juxtaposing quotation mark HOT 4
- GHC 9.6 HOT 1
- The Ocaml printer crashes if the indent level becomes negative HOT 1
- Improve generated CPP code to trace function calls HOT 5
- Optional Semicolons HOT 5
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