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#############################################################################
##
#W filter1.g GAP library Steve Linton
##
#H @(#)$Id: filter1.g,v 4.2 2002/04/15 10:04:40 sal Exp $
##
#Y Copyright (C) 1996, Lehrstuhl D fuer Mathematik, RWTH Aachen, Germany
#Y (C) 1998 School Math and Comp. Sci., University of St. Andrews, Scotland
#Y Copyright (C) 2002 The GAP Group
##
## Speed-critical code moved from filter.g so that it can be
## statically compiled
##
Revision.filter1_g :=
"@(#)$Id: filter1.g,v 4.2 2002/04/15 10:04:40 sal Exp $";
#############################################################################
##
#F WITH_HIDDEN_IMPS_FLAGS( <flags> )
##
HIDDEN_IMPS := [];
WITH_HIDDEN_IMPS_FLAGS_CACHE := [];
WITH_HIDDEN_IMPS_FLAGS_COUNT := 0;
WITH_HIDDEN_IMPS_FLAGS_CACHE_MISS := 0;
WITH_HIDDEN_IMPS_FLAGS_CACHE_HIT := 0;
Unbind( CLEAR_HIDDEN_IMP_CACHE);
BIND_GLOBAL( "CLEAR_HIDDEN_IMP_CACHE", function( filter )
local i, flags;
flags := FLAGS_FILTER(filter);
for i in [ 1, 3 .. LEN_LIST(WITH_HIDDEN_IMPS_FLAGS_CACHE)-1 ] do
if IsBound(WITH_HIDDEN_IMPS_FLAGS_CACHE[i]) then
if IS_SUBSET_FLAGS(WITH_HIDDEN_IMPS_FLAGS_CACHE[i+1],flags) then
Unbind(WITH_HIDDEN_IMPS_FLAGS_CACHE[i]);
Unbind(WITH_HIDDEN_IMPS_FLAGS_CACHE[i+1]);
fi;
fi;
od;
end );
BIND_GLOBAL( "WITH_HIDDEN_IMPS_FLAGS", function ( flags )
local with, changed, imp, hash;
hash := 2 * ( HASH_FLAGS(flags) mod 1009 ) + 1;
if IsBound(WITH_HIDDEN_IMPS_FLAGS_CACHE[hash]) then
if IS_IDENTICAL_OBJ(WITH_HIDDEN_IMPS_FLAGS_CACHE[hash],flags) then
WITH_HIDDEN_IMPS_FLAGS_CACHE_HIT :=
WITH_HIDDEN_IMPS_FLAGS_CACHE_HIT + 1;
return WITH_HIDDEN_IMPS_FLAGS_CACHE[hash+1];
fi;
fi;
WITH_HIDDEN_IMPS_FLAGS_CACHE_MISS := WITH_HIDDEN_IMPS_FLAGS_CACHE_MISS+1;
with := flags;
changed := true;
while changed do
changed := false;
for imp in HIDDEN_IMPS do
if IS_SUBSET_FLAGS( with, imp[2] )
and not IS_SUBSET_FLAGS( with, imp[1] )
then
with := AND_FLAGS( with, imp[1] );
changed := true;
fi;
od;
od;
WITH_HIDDEN_IMPS_FLAGS_CACHE[hash ] := flags;
WITH_HIDDEN_IMPS_FLAGS_CACHE[hash+1] := with;
return with;
end );
#############################################################################
##
#F WITH_IMPS_FLAGS( <flags> )
##
IMPLICATIONS := [];
WITH_IMPS_FLAGS_CACHE := [];
WITH_IMPS_FLAGS_COUNT := 0;
WITH_IMPS_FLAGS_CACHE_HIT := 0;
WITH_IMPS_FLAGS_CACHE_MISS := 0;
Unbind(CLEAR_IMP_CACHE);
BIND_GLOBAL( "CLEAR_IMP_CACHE", function()
WITH_IMPS_FLAGS_CACHE := [];
end );
BIND_GLOBAL( "WITH_IMPS_FLAGS", function ( flags )
local with, changed, imp, hash, hash2, i;
hash := HASH_FLAGS(flags) mod 11001;
for i in [ 0 .. 3 ] do
hash2 := 2 * ((hash+31*i) mod 11001) + 1;
if IsBound(WITH_IMPS_FLAGS_CACHE[hash2]) then
if IS_IDENTICAL_OBJ(WITH_IMPS_FLAGS_CACHE[hash2],flags) then
WITH_IMPS_FLAGS_CACHE_HIT := WITH_IMPS_FLAGS_CACHE_HIT + 1;
return WITH_IMPS_FLAGS_CACHE[hash2+1];
fi;
else
break;
fi;
od;
if i = 3 then
WITH_IMPS_FLAGS_COUNT := ( WITH_IMPS_FLAGS_COUNT + 1 ) mod 4;
i := WITH_IMPS_FLAGS_COUNT;
hash2 := 2*((hash+31*i) mod 11001) + 1;
fi;
WITH_IMPS_FLAGS_CACHE_MISS := WITH_IMPS_FLAGS_CACHE_MISS + 1;
with := flags;
changed := true;
while changed do
changed := false;
for imp in IMPLICATIONS do
if IS_SUBSET_FLAGS( with, imp[2] )
and not IS_SUBSET_FLAGS( with, imp[1] )
then
with := AND_FLAGS( with, imp[1] );
changed := true;
fi;
od;
od;
WITH_IMPS_FLAGS_CACHE[hash2 ] := flags;
WITH_IMPS_FLAGS_CACHE[hash2+1] := with;
return with;
end );
#############################################################################
##
#F RankFilter( <filter> ) . . . . . . . . . . . . . . . . rank of a filter
##
## Compute the rank including the hidden implications.
##
## (When completion files are used, the precomputed ranks are used.
## Therefore, `RankFilter' is set in `init.g' to appropriate values;
## the function that really computes the rank is `RANK_FILTER'.)
##
UNBIND_GLOBAL( "RANK_FILTER" );
BIND_GLOBAL( "RANK_FILTER", function( filter )
local rank, flags, i;
rank := 0;
if IS_FUNCTION(filter) then
flags := FLAGS_FILTER(filter);
else
flags := filter;
fi;
for i in TRUES_FLAGS(WITH_HIDDEN_IMPS_FLAGS(flags)) do
if IsBound(RANK_FILTERS[i]) then
rank := rank + RANK_FILTERS[i];
else
rank := rank + 1;
fi;
od;
return rank;
end );
RankFilter := RANK_FILTER;
UNBIND_GLOBAL( "RANK_FILTER_STORE" );
BIND_GLOBAL( "RANK_FILTER_STORE", function( filter )
local hash, rank, flags;
if IS_FUNCTION(filter) then
flags := FLAGS_FILTER(filter);
else
flags := filter;
fi;
hash := HASH_FLAGS(flags);
rank := RANK_FILTER(flags);
ADD_LIST( RANK_FILTER_LIST_CURRENT, hash );
ADD_LIST( RANK_FILTER_LIST_CURRENT, rank );
return rank;
end );
UNBIND_GLOBAL( "RANK_FILTER_COMPLETION" );
BIND_GLOBAL( "RANK_FILTER_COMPLETION", function( filter )
local hash, flags;
if IS_FUNCTION(filter) then
flags := FLAGS_FILTER(filter);
else
flags := filter;
fi;
hash := HASH_FLAGS(flags);
if hash <> RANK_FILTER_LIST[RANK_FILTER_COUNT] then
Error( "corrupted completion file" );
fi;
RANK_FILTER_COUNT := RANK_FILTER_COUNT+2;
return RANK_FILTER_LIST[RANK_FILTER_COUNT-1];
end );
#############################################################################
##
#E filter1.g . . . . . . . . . . . . . . . . . . . . . . . . . . . ends here
##
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