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Add headers to a few files which were missing them.
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Reviewed-by: ejgallego
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Also renamed it to relative_entry_level.
Correspondence between old and new representation is:
(n,L) -> LevelLt n
(n,E), (n,Prec n) -> LevelLe n
(n,Any) -> LevelSome
(n,Prec p) when n<>p was unused
Should not change global semantics (except error message in pr_arg).
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In particular, this fixes #9741.
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Instead of just string (and empty strings for tokens without payload)
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Tokens were having a double role:
- the output of the lexer
- the items of grammar entries, especially terminals
Now tokens are the output of the lexer, and this paves the way for
using a richer data type, eg including Loc.t
Patterns, as in Plexing.pattern, only represent patterns (for tokens)
and now have a bit more structure (eg the wildcard is represented
as None, not as "", while a regular pattern for "x" as Some "x")
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- remove duplicate type definitions `gram_assoc`, `gram_position`,
- make global `warning_verbose` variable into a parameter.
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- New command "Declare Custom Entry bar".
- Entries can have levels.
- Printing is done using a notion of coercion between grammar
entries. This typically corresponds to rules of the form
'Notation "[ x ]" := x (x custom myconstr).' but also
'Notation "{ x }" := x (in custom myconstr, x constr).'.
- Rules declaring idents such as 'Notation "x" := x (in custom myconstr, x ident).'
are natively recognized.
- Rules declaring globals such as 'Notation "x" := x (in custom myconstr, x global).'
are natively recognized.
Incidentally merging ETConstr and ETConstrAsBinder.
Noticed in passing that parsing binder as custom was not done as in
constr.
Probably some fine-tuning still to do (priority of notations,
interactions between scopes and entries, ...). To be tested live
further.
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Previously to this patch, `Notation_term` contained information about
both parsing and notation interpretation.
We split notation grammar to a file `parsing/notation_gram` as to make
`interp/` not to depend on some parsing structures such as entries.
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