Comments (8)
I'll leave this here in case someone will have the same question.
+#if MIN_TOOL_VERSION_alex(3,2,0)
+ (AlexLastAcc k input'' len, _, lookahead) -> (AlexToken input'' len (alex_actions ! k), lookahead)
+#else
(AlexLastAcc k input'' len, _, lookahead) -> (AlexToken input'' len k, lookahead)
+#endif
from alex.
The relevant line: https://github.com/yi-editor/yi/blob/master/yi-language/src/Yi/Lexer/common.hsinc#L39
Here act
is either an action or an index for alex_actions
.
from alex.
Can you do something like this in your .cabal file?
flag alex32
default: True
if flag(alex32)
build-depends: alex >= 3.2
ghc-options: -DALEX_3_2
else
build-depends: alex < 3.2
from alex.
I can but this would put the burden of knowing their alex version and supplying this flag on users, who most likely don't even know what alex is.
I'll do that if there's no other option.
@snoyberg @juhp Does stack by any chance expose alex version in some #define?
from alex.
I can but this would put the burden of knowing their alex version and supplying this flag on users, who most likely don't even know what alex is.
No - Cabal infers the value of flags automatically, users wouldn't need to do anything.
from alex.
I'm not sure this will work; build-depends doesn't play nicely with executable-only packages.
from alex.
If it doesn't, then you could use another package as a proxy. (a gross hack, but it would probably work)
from alex.
@qnikst proposed to use TOOL_VERSION_alex defined by Cabal
from alex.
Related Issues (20)
- New release HOT 3
- alex 3.2.7 fails to parse definitions which can pass alex 3.2.6 HOT 13
- How to build `alex` from git sources? Instructions in `README.md` are broken. HOT 3
- Agda-style Lexing HOT 3
- website (bad link) HOT 10
- Makefile (examples) HOT 2
- UTF-8 and text 2.0 HOT 2
- spelling of `DFS.GForrest` HOT 3
- Make `haskell.org/alex` redirect to `haskell-alex.readthedocs.io` ? HOT 6
- `alexSetUserState`/`alexGetUserState` with `monadUserState-bytestring` wrapper HOT 6
- Alex PVP violation? HOT 2
- Function `Util.brack` is not used
- Functions `Sort.isort` and `Sort.insrt` not used HOT 2
- Is module DFS really needed? HOT 2
- Deriving Ord for AlexPosn HOT 4
- upgrading problems with Cabal HOT 3
- Alex generates code that cannot be compiled by GHC 9.2 HOT 13
- Add option `--numeric-version`
- Unused `import Data.Char` in `basic-bytestring` lexer HOT 2
- Alex generates code with unqualified imports, e.g. of `GHC.Exts`
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from alex.