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Add ShowDeclarationsOfOperation helper #3459

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May 21, 2019
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Merged

Add ShowDeclarationsOfOperation helper #3459

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1 change: 1 addition & 0 deletions doc/ref/create.xml
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Original file line number Diff line number Diff line change
Expand Up @@ -1195,6 +1195,7 @@ See also Section <Ref Sect="More About Global Variables"/>.
<#Include Label="DeclareSynonym">
<#Include Label="FlushCaches">
<#Include Label="FilterByName">
<#Include Label="ShowDeclarationsOfOperation">

</Section>

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46 changes: 46 additions & 0 deletions lib/methwhy.g
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Expand Up @@ -388,6 +388,52 @@ BIND_GLOBAL("ShowImpliedFilters",function(filter)
fi;
end);


#############################################################################
##
#F ShowDeclarationsOfOperation( <oper> )
##
## <#GAPDoc Label="ShowDeclarationsOfOperation">
## <ManSection>
## <Func Name="ShowDeclarationsOfOperation" Arg='oper'/>
##
## <Description>
## Displays information about all declarations of the operation <A>oper</A>,
## including the location of each declaration and the argument filters.
## <Log><![CDATA[
## gap> ShowDeclarationsOfOperation(IsFinite);
## Available declarations for operation <Property "IsFinite">:
## 1: GAPROOT/lib/coll.gd:1451 with 1 arguments, and filters [ IsListOrCollection ]
## 2: GAPROOT/lib/float.gd:212 with 1 arguments, and filters [ IsFloat ]
## 3: GAPROOT/lib/ctbl.gd:1195 with 1 arguments, and filters [ IsNearlyCharacterTable ]
## ]]></Log>
## </Description>
## </ManSection>
## <#/GAPDoc>
##
BIND_GLOBAL("ShowDeclarationsOfOperation",function(oper)
local locs, reqs, i, r;
if not IsOperation(oper) then
Error("<oper> must be an operation");
fi;
Print("Available declarations for operation ", oper, ":\n");
locs := GET_DECLARATION_LOCATIONS(oper);
if locs = fail then
return;
fi;
reqs := GET_OPER_FLAGS(oper);
for i in [1.. Length(locs)] do
r := List(reqs[i], r -> JoinStringsWithSeparator(NamesFilter(r), " and \c"));
Print(String(i, 3), ": ", locs[i][1], "\c:", locs[i][2], "\c",
" with ", Length(reqs[i]), "\c",
" arguments, and filters [ ", "\c",
JoinStringsWithSeparator(r, ", "),
" ]\n"
);
od;
end);


#############################################################################
##
#F PageSource( func ) . . . . . . . . . . . . . . . show source code in pager
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