Comments (4)
Yes, unfortunately "'"
isn't a proper operator character atm in the standard backend (Haskell).
You can use this invocation instead, to use the C backend instead of the Haskell one.
bnfc --c -m GRAMMAR.cf
from bnfc.
Since Ident
s can contain quotation marks, x'
will parse as an identifier.
You can define your own identifier tokens, e.g.:
Exp. Exp ::= Id "'";
token Id letter (letter | digit | '_')*;
This works as expected in the "imperative" backends (C, C++, Java) but not in the "functional" ones (Haskell, OCaml).
The problem is in how the functional backends implement the lexer: they always include lexing of Ident
, so that keywords can be lexed as Ident
and then classified as keywords later. This is to prevent explosion of the lexer automata.
Unfortunately, it leads to this bug.
Related:
from bnfc.
Thanks, Andreas, for a quick reply!
Exp. Exp ::= Id "'"; token Id letter (letter | digit | '_')*;
That is roughly how I started. I've just minimized that example, since the problem persisted. I am following the basics steps from the tutorial, which suggests to use Test
, generated with bnfc -d -m
for basic testing.
from bnfc.
Yes, unfortunately
"'"
isn't a proper operator character atm in the standard backend (Haskell). You can use this invocation instead, to use the C backend instead of the Haskell one.bnfc --c -m GRAMMAR.cf
My problem is that I combine bnfc Haskell backend with Haskell-based uuagc...
I would highly appreciate a command line flag for the Haskell backend to omit including Ident, which I could put in my Makefile...
from bnfc.
Related Issues (20)
- 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
- Java serialization (pretty print) of strings does not escape special chars HOT 3
- how-to cabal HOT 3
- Java/ANTLR does not lex escape sequences in String HOT 1
- Ocaml backends do not lex escape sequences in Char
- Java: jflex-generated lexer with line numbers fails to build HOT 1
- Release 2.9.5
- Java/ANTLR: example C fails to build with Java 20 due to case mismatch
- Advertisement: Online yacc/lex grammar editor/tester HOT 1
- Support GHC 9.8
- Document that `$LANG` and `$LOCALE_ARCHIVE` need to be set
- Store tokens' position range instead of just start position
- List category of internal category should be internal HOT 1
- BNFC tarball ships `Lex.hs` and `Par.hs`
- Drop support for GHC 7.10
- Release support for ghc 9.8.1 HOT 5
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