mirror of
https://github.com/Mercury-Language/mercury.git
synced 2025-12-17 14:57:03 +00:00
cb559dee89
prog_util.nl: Changed if-then-else to -> ; string.nl: Changed if-then-else to -> ; term.nl: Changed if-then-else to -> ; and added an XXX in term__context_init varset.nl: Changed if-then-else to -> ;
267 lines
10 KiB
Mathematica
267 lines
10 KiB
Mathematica
%-----------------------------------------------------------------------------%
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%-----------------------------------------------------------------------------%
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:- module prog_util.
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:- interface.
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:- import_module prog_io, list.
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%-----------------------------------------------------------------------------%
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% XXX change the `goedel_' prefixes
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% The following predicate goedel_expand_eqv_types traverses
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% through the list of items. Each time it finds an eqv_type
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% definition, it replaces all occurrences of the type (both
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% before and after it in the list of items) with type that it
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% is equivalent to. This has the effect of eliminating all the
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% equivalence types from the source code. Circular equivalence
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% types in the input will cause references to undefined types
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% in the output.
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:- pred goedel_expand_eqv_types(list(item_and_context), list(item_and_context)).
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:- mode goedel_expand_eqv_types(input, output).
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% The following predicate goedel_replace_eqv_type_list
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% performs substititution of a single type on a list
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% of items. It is used in mercury_to_goedel to rename
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% type `int' as `integer'.
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:- pred goedel_replace_eqv_type_list(list(item_and_context), varset, string,
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list(type_param), type, list(item_and_context)).
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:- mode goedel_replace_eqv_type_list(input, input, input, input, input, output).
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%-----------------------------------------------------------------------------%
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% Convert a (possibly module-qualified) sym_name into a string.
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:- pred unqualify_name(sym_name, string).
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:- mode unqualify_name(input, output) is det.
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%-----------------------------------------------------------------------------%
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% A pred declaration may contains just types, as in
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% :- pred append(list(T), list(T), list(T)).
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% or it may contain both types and modes, as in
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% :- pred append(list(T)::input, list(T)::input,
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% list(T)::output).
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%
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% This predicate takes the argument list of a pred declaration,
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% splits it into two separate lists for the types and (if present)
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% the modes.
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:- type maybe_modes ---> yes(list(mode)) ; no.
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:- pred split_types_and_modes(list(type_and_mode), list(type), maybe_modes).
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:- mode split_types_and_modes(input, output, output).
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%-----------------------------------------------------------------------------%
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%-----------------------------------------------------------------------------%
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:- implementation.
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%-----------------------------------------------------------------------------%
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%-----------------------------------------------------------------------------%
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goedel_expand_eqv_types(Items0, Items) :-
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goedel_replace_all_eqv_types(Items0, [], Items1),
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reverse(Items1, Items).
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:- pred goedel_replace_all_eqv_types(list(item_and_context),
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list(item_and_context), list(item_and_context)).
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:- mode goedel_replace_all_eqv_types(input, input, output).
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goedel_replace_all_eqv_types([], Items, Items).
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goedel_replace_all_eqv_types([Item - Context | Items0], ItemList0, ItemList) :-
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( Item = type_defn(VarSet, eqv_type(Name, Args, Body), _Cond) ->
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unqualify_name(Name, Name2),
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goedel_replace_eqv_type_list(ItemList0, VarSet, Name2, Args,
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Body, ItemList1),
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goedel_replace_eqv_type_list(Items0, VarSet, Name2, Args, Body, Items1),
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goedel_replace_all_eqv_types(Items1, ItemList1, ItemList)
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;
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goedel_replace_all_eqv_types(Items0,
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[Item - Context | ItemList0], ItemList)
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).
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goedel_replace_eqv_type_list([], _, _, _, _, []).
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goedel_replace_eqv_type_list([Item0 - Context| Items0], VarSet, Name, Args,
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Body, [Item - Context| Items]) :-
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(
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%some [Item1]
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goedel_replace_eqv_type(Item0, VarSet, Name, Args, Body, Item1)
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->
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Item = Item1
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;
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Item = Item0
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),
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goedel_replace_eqv_type_list(Items0, VarSet, Name, Args, Body, Items).
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:- pred goedel_replace_eqv_type(item, varset, string, list(type_param), type,
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item).
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:- mode goedel_replace_eqv_type(input, input, input, input, input, output).
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goedel_replace_eqv_type(type_defn(VarSet0, TypeDefn0, Cond),
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TVarSet, Name, Args0, Body0,
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type_defn(VarSet, TypeDefn, Cond)) :-
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varset__merge(VarSet0, TVarSet, [Body0 | Args0], VarSet, [Body | Args]),
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goedel_replace_eqv_type_defn(TypeDefn0, Name, Args, Body, TypeDefn).
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goedel_replace_eqv_type(pred(VarSet0, PredName, TypesAndModes0, Det, Cond),
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TVarSet, Name, Args0, Body0,
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pred(VarSet, PredName, TypesAndModes, Det, Cond)) :-
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varset__merge(VarSet0, TVarSet, [Body0 | Args0], VarSet, [Body | Args]),
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goedel_replace_eqv_type_pred(TypesAndModes0, Name, Args, Body,
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no, TypesAndModes, yes).
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:- pred goedel_replace_eqv_type_defn(type_defn, string, list(type_param),
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type, type_defn).
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:- mode goedel_replace_eqv_type_defn(input, input, input, input, output).
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goedel_replace_eqv_type_defn(eqv_type(TName, TArgs, TBody0),
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Name, Args, Body,
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eqv_type(TName, TArgs, TBody)) :-
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goedel_replace_eqv_type_type(TBody0, Name, Args, Body, no, TBody, yes).
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goedel_replace_eqv_type_defn(uu_type(TName, TArgs, TBody0),
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Name, Args, Body,
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uu_type(TName, TArgs, TBody)) :-
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goedel_replace_eqv_type_uu(TBody0, Name, Args, Body, no, TBody, yes).
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goedel_replace_eqv_type_defn(du_type(TName, TArgs, TBody0),
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Name, Args, Body,
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du_type(TName, TArgs, TBody)) :-
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goedel_replace_eqv_type_du(TBody0, Name, Args, Body, no, TBody, yes).
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:- pred goedel_replace_eqv_type_uu(list(type), string, list(type_param),
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type, bool, list(type), bool).
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:- mode goedel_replace_eqv_type_uu(input, input, input, input, input,
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output, output).
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goedel_replace_eqv_type_uu([], _Name, _Args, _Body, Found, [], Found).
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goedel_replace_eqv_type_uu([T0|Ts0], Name, Args, Body, Found0, [T|Ts], Found) :-
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goedel_replace_eqv_type_type(T0, Name, Args, Body, Found0, T, Found1),
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goedel_replace_eqv_type_uu(Ts0, Name, Args, Body, Found1, Ts, Found).
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:- pred goedel_replace_eqv_type_du(list(constructor), string, list(type_param),
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type, bool, list(constructor), bool).
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:- mode goedel_replace_eqv_type_du(input, input, input, input, input,
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output, output).
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goedel_replace_eqv_type_du([], _Name, _Args, _Body, Found, [], Found).
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goedel_replace_eqv_type_du([T0|Ts0], Name, Args, Body, Found0, [T|Ts], Found) :-
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goedel_replace_eqv_type_ctor(T0, Name, Args, Body, Found0, T, Found1),
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goedel_replace_eqv_type_du(Ts0, Name, Args, Body, Found1, Ts, Found).
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:- pred goedel_replace_eqv_type_ctor(constructor, string, list(type_param),
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type, bool, constructor, bool).
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:- mode goedel_replace_eqv_type_ctor(input, input, input, input, input,
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output, output).
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goedel_replace_eqv_type_ctor(TName - Targs0, Name, Args, Body, Found0,
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TName - Targs, Found) :-
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goedel_replace_eqv_type_uu(Targs0, Name, Args, Body, Found0,
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Targs, Found).
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:- pred goedel_replace_eqv_type_type(type, string, list(type_param),
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type, bool, type, bool).
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:- mode goedel_replace_eqv_type_type(input, input, input, input, input,
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output, output).
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goedel_replace_eqv_type_type(term_variable(V), _Name, _Args, _Body, Found,
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term_variable(V), Found).
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goedel_replace_eqv_type_type(term_functor(F, TArgs0, Context), Name, Args,
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Body, Found0, Type, Found) :-
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(
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F = term_atom(Name),
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same_length(TArgs0, Args)
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->
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type_param_to_var_list(Args, Args2),
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term__substitute_corresponding(Args2, TArgs0, Body, Type),
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Found = yes
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;
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goedel_replace_eqv_type_uu(TArgs0, Name, Args, Body, Found0,
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TArgs, Found),
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Type = term_functor(F, TArgs, Context)
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).
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:- pred type_param_to_var_list(list(type_param), list(var)).
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:- mode type_param_to_var_list(input, output).
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type_param_to_var_list([], []).
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type_param_to_var_list([T | Ts], [V | Vs]) :-
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type_param_to_var(T, V),
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type_param_to_var_list(Ts, Vs).
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:- pred type_param_to_var(type_param, var).
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:- mode type_param_to_var(input, output).
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type_param_to_var(term_variable(V), V).
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:- pred goedel_replace_eqv_type_pred(list(type_and_mode), string,
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list(type_param), type, bool, list(type_and_mode), bool).
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:- mode goedel_replace_eqv_type_pred(input, input, input, input, input,
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output, output).
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goedel_replace_eqv_type_pred([], _Name, _Args, _Body, Found, [], Found).
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goedel_replace_eqv_type_pred([TM0|TMs0], Name, Args, Body, Found0,
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[TM|TMs], Found) :-
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goedel_replace_eqv_type_tm(TM0, Name, Args, Body, Found0, TM, Found1),
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goedel_replace_eqv_type_pred(TMs0, Name, Args, Body, Found1,
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TMs, Found).
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:- pred goedel_replace_eqv_type_tm(type_and_mode, string, list(type_param),
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type, bool, type_and_mode, bool).
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:- mode goedel_replace_eqv_type_tm(input, input, input, input, input,
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output, output).
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goedel_replace_eqv_type_tm(type_only(Type0), Name, Args, Body, Found0,
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type_only(Type), Found) :-
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goedel_replace_eqv_type_type(Type0, Name, Args, Body, Found0, Type,
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Found).
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goedel_replace_eqv_type_tm(type_and_mode(Type0, Mode), Name, Args, Body, Found0,
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type_and_mode(Type, Mode), Found) :-
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goedel_replace_eqv_type_type(Type0, Name, Args, Body, Found0, Type,
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Found).
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%-----------------------------------------------------------------------------%
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%-----------------------------------------------------------------------------%
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unqualify_name(unqualified(Name), Name).
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unqualify_name(qualified(_Module, Name), Name).
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%-----------------------------------------------------------------------------%
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%-----------------------------------------------------------------------------%
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split_types_and_modes(TypesAndModes, Types, MaybeModes) :-
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split_types_and_modes_2(TypesAndModes, no, Types, Modes, Result),
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(
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Result = yes
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->
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MaybeModes = yes(Modes)
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;
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MaybeModes = no
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).
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:- type maybe ---> yes ; no.
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:- pred split_types_and_modes_2(list(type_and_mode), maybe,
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list(type), list(mode), maybe).
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:- mode split_types_and_modes_2(input, input, output, output, output).
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% T = type, M = mode, TM = combined type and mode
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split_types_and_modes_2([], Result, [], [], Result).
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split_types_and_modes_2([TM|TMs], Result0, [T|Ts], [M|Ms], Result) :-
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split_type_and_mode(TM, Result0, T, M, Result1),
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split_types_and_modes_2(TMs, Result1, Ts, Ms, Result).
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% if a pred declaration specifies modes for some but
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% not all of the arguments, then the mode for the
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% other arguments defaults to free->free.
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% - should this be an error instead?
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:- pred split_type_and_mode(type_and_mode, maybe, type, mode, maybe).
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:- mode split_type_and_mode(input, input, output, output, output).
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split_type_and_mode(type_only(T), _, T, (free -> free), yes).
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split_type_and_mode(type_and_mode(T,M), R, T, M, R).
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%-----------------------------------------------------------------------------%
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%-----------------------------------------------------------------------------%
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