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#############################################################################
##
## This file is part of GAP, a system for computational discrete algebra.
##
## Copyright of GAP belongs to its developers, whose names are too numerous
## to list here. Please refer to the COPYRIGHT file for details.
##
## SPDX-License-Identifier: GPL-2.0-or-later
##
# returns names of components
InstallMethod( RecNames,
"for a record in internal representation",
[ IsRecord and IsInternalRep ],
REC_NAMES );
InstallGlobalFunction( "NamesOfComponents",
function( obj )
if IsComponentObjectRep( obj ) then
return REC_NAMES_COMOBJ( obj );
elif IsRecord( obj ) then
return RecNames( obj );
else
Error( "<obj> must be a component object or a record" );
fi;
end );
#############################################################################
##
#m PrintObj( <record> )
##
## The record <record> is printed by printing all its components.
##
InstallMethod( PrintObj,
"record",
[ IsRecord ],
## Changed to use sorted component names to make printing nicer to read and
## independent of session (i.e., the ordering in which component names were
## first used). Except for the sorting of components this does the same as
## the former (now removed) kernel function FuncPRINT_PREC_DEFAULT.
function( record )
local com, i, snam, nam, names;
Print("\>\>rec(\n\>\>");
com := false;
names := Set(RecNames(record));
for i in [1..Length(names)] do
nam := names[i];
if com then
Print("\<\<,\n\>\>");
else
com := true;
fi;
SET_PRINT_OBJ_INDEX(RNamObj(nam));
# easy if nam is integer or valid identifier:
if ForAll(nam, x-> x in IdentifierLetters) and Size(nam) > 0 then
Print(nam, "\< := \>");
else
# otherwise we use (...) syntax:
snam := String(nam);
Print("("); View(snam); Print(")\< := \>");
fi;
PrintObj(record.(nam));
od;
Print(" \<\<\<\<)");
end);
#############################################################################
##
#m String( <record> ) . . . . . . . . . . . . . . . . . . . . for a record
##
InstallMethod( String,
"record",
[ IsRecord ],
function( record )
local str, nam, com;
str := "rec( ";
com := false;
for nam in Set(RecNames( record )) do
if com then
Append( str, ", " );
else
com := true;
fi;
Append( str, nam );
Append( str, " := " );
if IsStringRep( record.( nam ) )
or ( IsString( record.( nam ) )
and not IsEmpty( record.( nam ) ) ) then
Append( str, "\"" );
Append( str, String( record.(nam) ) );
Append( str, "\"" );
else
Append( str, String( record.(nam) ) );
fi;
od;
Append( str, " )" );
# should not be necessary if all methods for components are alright
ConvertToStringRep( str );
return str;
end );
#############################################################################
##
#m ViewObj( <record> ) . . . . . . . . . . . . . . . for a record (default)
##
InstallMethod( ViewObj,
"record",
[ IsRecord ],
function( record )
local nam, com, i, snam, names;
Print("\>\>rec( \>\>");
com := false;
names := Set(RecNames(record));
for i in [1..Length(names)] do
nam := names[i];
if com then
Print("\<,\< \>\>");
else
com := true;
fi;
SET_PRINT_OBJ_INDEX(RNamObj(nam));
# easy if nam is integer or valid identifier:
if ForAll(nam, x-> x in IdentifierLetters) and Size(nam) > 0 then
Print(nam, " := ");
else
# otherwise we use (...) syntax:
snam := String(nam);
Print("("); View(snam); Print(") := ");
fi;
ViewObj(record.(nam));
od;
Print(" \<\<\<\<)");
end);
# methods to catch error cases
InstallMethod( \.,
"catch error",
true,
[IsObject,IsObject],
0,
function(obj,nr)
local msg;
msg:=Concatenation("illegal access to record component `obj.",
NameRNam(nr),"'\n",
"of the object <obj>. (Objects by default do not have record components.\n",
"The error might be a relic from translated GAP3 code.)");
Error(msg);
end);
InstallMethod( IsBound\.,
"catch error",true,[IsObject,IsObject],0,
function(obj,nr)
local msg;
msg:=Concatenation("illegal access to record component `IsBound(obj.",
NameRNam(nr),")'\n",
"of the object <obj>. (Objects by default do not have record components.\n",
"The error might be a relic from translated GAP3 code.)");
Error(msg);
end);
InstallMethod( Unbind\.,
"catch error",
true,
[IsObject,IsObject],
0,
function(obj,nr)
local msg;
msg:=Concatenation("illegal access to record component `Unbind(obj.",
NameRNam(nr),")'\n",
"of the object <obj>. (Objects by default do not have record components.\n",
"The error might be a relic from translated GAP3 code.)");
Error(msg);
end);
InstallMethod( \.\:\=,
"catch error",
true,
[IsObject,IsObject,IsObject],
0,
function(obj,nr,elm)
local msg;
msg:=Concatenation("illegal assignment to record component `obj.",
NameRNam(nr),"'\n",
"of the object <obj>. (Objects by default cannot have record components.\n",
"The error might be a relic from translated GAP3 code.)");
Error(msg);
end);
#############################################################################
##
#F SetNamesForFunctionsInRecord( <rec-name>[, <record> ][, <field-names>])
##
## set the names of functions bound to components of a record.
##
InstallGlobalFunction(SetNamesForFunctionsInRecord,
function(arg)
local recname, next, record, fields, field;
if LENGTH(arg) = 0 or not IS_STRING(arg[1]) then
Error("SetNamesForFunctionsInRecord: you must give a record name");
fi;
recname := arg[1];
next := 2;
if LENGTH(arg) >= next and IS_REC(arg[next]) then
record := arg[2];
next := 3;
else
record := VALUE_GLOBAL(recname);
fi;
if LENGTH(arg) >= next and IS_LIST(arg[next]) then
fields := arg[next];
else
fields := REC_NAMES(record);
fi;
for field in fields do
if IS_STRING(field) then
if IsFunction(record.(field)) then
SetNameFunction(record.(field), Concatenation(recname,".",field));
fi;
fi;
od;
end);
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