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add prefixes to gensym keys

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This commit is contained in:
Mark Thom
2020-01-13 21:01:09 -07:00
parent 728be8c259
commit 9958ad6f34
1 changed files with 11 additions and 5 deletions
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16
src/prolog/lib/gensym.pl
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@@ -1,4 +1,3 @@
:- module(gensym, [gensym/2,
reset_gensym/1]).
@@ -7,6 +6,12 @@
:- use_module(library(non_iso)).
:- use_module(library(si)).
gensym_key(Base, BaseKey) :-
atom_chars('gensym_', PrefixChars),
atom_chars(Base, BaseChars),
append(PrefixChars, BaseChars, BaseKeyChars),
atom_chars(BaseKey, BaseKeyChars).
append_id(Base, UniqueID, Unique) :-
atom_chars(Base, BaseChars),
number_chars(UniqueID, IDChars),
@@ -15,12 +20,13 @@ append_id(Base, UniqueID, Unique) :-
gensym(Base, Unique) :-
must_be(var, Unique),
atom_si(Base),
( bb_get(Base, UniqueID0) ->
atom_si(Base),
gensym_key(Base, BaseKey),
( bb_get(BaseKey, UniqueID0) ->
UniqueID is UniqueID0 + 1,
bb_put(Base, UniqueID),
bb_put(BaseKey, UniqueID),
append_id(Base, UniqueID, Unique)
; bb_put(Base, 1),
; bb_put(BaseKey, 1),
append_id(Base, 1, Unique)
).