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|ID||Project||Category||View Status||Date Submitted||Last Update|
|0005221||OCaml||Camlp4||public||2011-02-05 13:58||2011-12-12 14:54|
|Target Version||Fixed in Version|
|Summary||0005221: Gram.token_info abstraction is too restrictrive, could be moved to Token|
|Description||I'm having a type regression under 3.12 due to a formerly public type which is now private in Camlp4 interface.|
My use case is to compose the Gram1.Entry.of_parser and Gram2.parse_tokens_after_input, to define a grammar entry from the action of a grammar entry of a *different* grammar. This was possible in 3.10/11 as both functions relied on the following type:
(Token.t * Loc.t) Stream.t
As both grammars relied on the same Lexer module -- of course it doesn't make sense to apply one grammar to an other input stream if the lexers are different -- the Token and Loc module are shared, the types are compatible and this works fine.
At 3.12 the type was changed to:
(Token.t * token_info) Stream.t
where token_info is a private type of the `Gram` module. Two private types of distinct modules are incompatible, so my code doesn't compile anymore.
I suggest the token_info type definition could be moved into the Token module. I don't think its semantic place it necessarily in the Grammar module, it's mostly a per-token information. If it was defined in Token, even abstractly, different grammars sharing the same Token and Loc module could communicate `token_info` again.
This change wouldn't break anything as it would only expose more sharing of the `token_info` type. Of course, for backward-compatibility, an alias inside Gram (type token_info = Token.token_info) would be fine.
|Additional Information||Attached is a simple example file exhibiting the problem: it compiles under 3.10/11, but not under 3.12. It is actually faithfully reproduces my use case in the Macaque project.|
|Tags||No tags attached.|
|Attached Files||sample.ml [^] (981 bytes) 2011-02-05 13:58 [Show Content]|
I committed a fix in the version/3.12 branch. I prefered to keep the token_info type close to the grammar code. However thanks to applicative functors, I've written the type in such a way that the type only depends on the location type.
Please try this commit and tell us if it fixes your issue.
|2011-02-05 13:58||bluestorm||New Issue|
|2011-02-05 13:58||bluestorm||Status||new => assigned|
|2011-02-05 13:58||bluestorm||Assigned To||=> ertai|
|2011-02-05 13:58||bluestorm||File Added: sample.ml|
|2011-02-05 20:17||ertai||Note Added: 0005796|
|2011-10-26 08:44||ertai||Assigned To||ertai => xclerc|
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