1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
##
## Copyright (C) 1996, Lehrstuhl D für Mathematik, RWTH Aachen, Germany
## (C) 1998 School Math and Comp. Sci., University of St Andrews, Scotland
## Copyright (C) 2002 The GAP Group
##
## This software is licensed under the GPL 2 or later, please refer
## to the COPYRIGHT.md and LICENSE files for details.
##
#############################################################################
##
#V IdOfFilter
##
## <#GAPDoc Label="IdOfFilter">
## <ManSection>
## <Func Name="IdOfFilter" Arg="filter"/>
## <Func Name="IdOfFilterByName" Arg="name"/>
##
## <Description>
## finds the id of the filter <A>filter</A>, or the id of the filter
## with name <A>name</A> respectively.
## The id of a filter is equal to the
## position of this filter in the global FILTERS list.
## <P/>
## Note that not every <C>filter</C> for which <C>IsFilter(filter)</C>
## returns <C>true</C> has an ID, only elementary filters do.
## </Description>
## </ManSection>
## <#/GAPDoc>
##
## Note that the filter ID is stored in FLAG1_FILTER for most filters,
## testers have the ID stored in FLAG2_FILTER, so the code below is
## more efficient than just iterating over the FILTERS list.
##
##
BIND_GLOBAL( "IdOfFilter",
function(filter)
local fid;
fid := FLAG1_FILTER(filter);
if fid > 0 and FILTERS[fid] = filter then
return fid;
fi;
fid := FLAG2_FILTER(filter);
if fid > 0 and FILTERS[fid] = filter then
return fid;
fi;
return fail;
end);
BIND_GLOBAL( "IdOfFilterByName",
name -> PositionProperty(FILTERS, f -> NAME_FUNC(f) = name) );
#############################################################################
##
#V FilterByName
##
## <#GAPDoc Label="FilterByName">
## <ManSection>
## <Func Name="FilterByName" Arg="name"/>
##
## <Description>
## finds the filter with name <A>name</A> in the global FILTERS list. This
## is useful to find filters that were created but not bound to a global
## variable.
## </Description>
## </ManSection>
## <#/GAPDoc>
##
BIND_GLOBAL( "FilterByName",
name -> First(FILTERS, f -> NAME_FUNC(f) = name) );
|
