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It is responsible for turning a tagged pretty-printing into
a semi-structured document.
clib.mllib: Include RichPp as well as Xml_*.
The migration of Xml_* from lib to clib is needed by RichPp
depends on these modules.
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Xml_parser, Xml_printer: Use it.
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- Functorize Ppconstr with respect to a set of tagging functions.
- These functions are meant to introduce tags to produce semistructured
pretty printings.
printing/Ppconstr:
Preserve the previous behaviour of this module by instantiating Make
with tagging functions that do nothing.
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Extend this type with Ppcmd_open_tag and Ppcmd_close_tag.
lib/Pp.ppcmd_pp_dirs:
Handle these tags with a straightforward translation to
corresponding Format commands.
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Make evaluation order explicit.
(Do not rely anymore on ocaml evaluation order, which is unspecified.)
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eager meta substition in w_unify, so as to preserve compatibility
after PMP's move of (setoid) rewrite clauses from metas to
evars (fbbe491cfa).
Hoping it is compatible for non-rewrite uses of the eager meta flag,
and that it is not too costly.
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This new implementation now allows for simultaneous replacing of hypotheses,
thus fixing bug #2149.
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on vm and #3068 by Nov 2 commit on destruct.
Also fixed test for failure of #3459.
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with evars.
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This is mainly shuffling code around and removing internal
refs that are not needed anymore.
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for residual unifiable evars (otherwise "thin" from logic.ml, erases
the src field) + typo.
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intrusive residual local definitions + more conservative strategy for
which variables are not generalized (point 2 of 4df1ddc6d6bd07073).
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Instead of keeping checking that evars are pending, we cache the pending
evars in a proper set computed once and for all.
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local definitions...
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- It removes some redundancies.
- It fixes failures when destructing a term mentioning goal hypotheses
x1, ..., xn or a term which is a section variable x when this term
is in a type with indices, and the indices also occur in the type of
one of x1, ..., xn, or of x.
- It fixes non-respect of eliminator type when completing pattern possibly
given by a prefix.
- It fixes b2e1d4ea930c which was dealing with the case when the term
was a section variable (it was unfortunately also breaking some
compatibility about which variables variable were generalized in
induction and which variables were automatically cleared because
unselected).
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occurrences: some uniformisation was not appropriate for "change").
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[Info] command.
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[Set Info Level n] prints all info traces at level [n]. [Unset Info Level] stops the automatic printing of info traces. The unfolding level [n] can be overloaded by local [Info m tac] calls.
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Some particular care needed to be taken to print aliases properly.
The printing of argument is just the generic printer for [genarg]. The trouble is that (apart from being incomplete), it does not know that it's printing Ltac arguments. As a consequence, the arguments are not properly quoted (e.g. if they are tactic expressions, they are not within [ltac:(...)].
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Empirically it works better on some notations than on others and I have no idea why. I've seen notations not printing their arguments, for instance, and other printing perfectly.
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Since PMP's intervention, the [TACTIC EXTEND] tactics are not uniform: some are syntax, and some are just an internal name for an Ltac definition. The latter kind prints an internal name. It may be better to avoid printing them in the trace altogether. But I haven't figured out how to detect that properly yet.
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The printing uses the printer for interpreted tactics. It only works for tactics which are defined in the new style. There are still a few atomic tactics in tacinterp which are defined in [V82] style. Namely:
exact, apply, clear, rename, reduce, change, (mutual variant of) fix, (mutual variant of) cofix
These print placeholder names which are never reparsable and not as useful.
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Re-add, in fact, since it was there in v8.3 but was dead code in v8.4 hence was deleted. It is necessary for printing info traces, however. A lot of the code had changed since v8.3, so adapting the code was non-trivial and some thing may be printed wrong.
It require re-adding a [tacexpr] argument to [gen_tactic_expr]. It had been made obsolete by the deletion of [pr_tactic] in v8.4 (even though printing [glob_tactic_expr] in a [tactic_expr] is only an approximation of the appropriate behaviour).
A new kind of argument, [delayed_constr], has made an appearance between v8.4 and trunk, and it differs from [constr] in the typed level. So it required its own parameter in [gen_tactic_expr]. At this point [delayed_constr] are printed in the globalised level because they are interpreted as closures. Maybe a better approximation is warranted.
Both in the printing of rewrite and induction, I changed a [pr_lconstr] (note the 'l') by a [pr_dconstr]. It is probably not quite correct, and may need fixing (adding a [pr_dlconstr] to [Pptactics] I guess?).
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The name is chosen in accordance to Ltac's syntax. In particular [refine] prints as Ltac's refine, which is not entirely correct (Ltac's refine does some βι-reduction after refinement). Maybe it would be better to give make it clear that it is a different refine. Still in refine, the constr is printed without taking into account the new evars, which, apart from potentially getting the order of the goals wrong, prints new evars as ?x instead of ?[x]. A printer for terms with new evars will be necessary.
In the case of [V82.tactic], the name is just <unknown> because there is no way to retrieve any information. It won't appear in the first level of info in Ltac, however, if the user would require a deeper trace, he may see internal tactics (Tactics defined with TACTIC EXTEND also have weird, unparsable, internal names).
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Hence dispatches are printed as dispatches rather than sequences.
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Called with [Info n tac], runs [tac] and prints its info trace unfolding [n] level of tactic names ([0] for no unfolding at all).
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