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pickle.gi
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pickle.gi
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#############################################################################
##
## pickle.gi GAP 4 package IO
## Max Neunhoeffer
##
## Copyright (C) by Max Neunhoeffer
## This file is free software, see license information at the end.
##
## This file contains functions for pickling and unpickling.
##
#################
# (Un-)Pickling:
#################
BindGlobal( "IO_PICKLECACHE", rec( ids := [], nrs := [], obs := [],
depth := 0 ) );
InstallGlobalFunction( IO_ClearPickleCache,
function( )
IO_PICKLECACHE.ids := [];
IO_PICKLECACHE.nrs := [];
IO_PICKLECACHE.obs := [];
IO_PICKLECACHE.depth := 0;
end );
InstallGlobalFunction( IO_AddToPickled,
function( ob )
local id,pos;
IO_PICKLECACHE.depth := IO_PICKLECACHE.depth + 1;
id := MASTER_POINTER_NUMBER(ob);
pos := PositionSorted( IO_PICKLECACHE.ids, id );
if pos <= Length(IO_PICKLECACHE.ids) and IO_PICKLECACHE.ids[pos] = id then
return IO_PICKLECACHE.nrs[pos];
else
Add(IO_PICKLECACHE.ids,id,pos);
Add(IO_PICKLECACHE.nrs,Length(IO_PICKLECACHE.ids),pos);
# Store a reference here so the result of
# MASTER_POINTER_NUMBER will not get reused by another object.
Add(IO_PICKLECACHE.obs,ob);
return false;
fi;
end );
InstallGlobalFunction( IO_IsAlreadyPickled,
function( ob )
local id,pos;
id := MASTER_POINTER_NUMBER(ob);
pos := PositionSorted( IO_PICKLECACHE.ids, id );
if pos <= Length(IO_PICKLECACHE.ids) and IO_PICKLECACHE.ids[pos] = id then
return IO_PICKLECACHE.nrs[pos];
else
return false;
fi;
end );
InstallGlobalFunction( IO_FinalizePickled,
function( )
if IO_PICKLECACHE.depth <= 0 then
Error("pickling depth has gone below zero!");
fi;
IO_PICKLECACHE.depth := IO_PICKLECACHE.depth - 1;
if IO_PICKLECACHE.depth = 0 then
# important to clear the cache:
IO_ClearPickleCache();
fi;
end );
InstallGlobalFunction( IO_AddToUnpickled,
function( ob )
IO_PICKLECACHE.depth := IO_PICKLECACHE.depth + 1;
Add( IO_PICKLECACHE.obs, ob );
end );
InstallGlobalFunction( IO_FinalizeUnpickled,
function( )
if IO_PICKLECACHE.depth <= 0 then
Error("pickling depth has gone below zero!");
fi;
IO_PICKLECACHE.depth := IO_PICKLECACHE.depth - 1;
if IO_PICKLECACHE.depth = 0 then
# important to clear the cache:
IO_ClearPickleCache();
fi;
end );
InstallGlobalFunction( IO_WriteSmallInt,
function( f, i )
local h,l;
h := HexStringInt(i);
l := Length(h);
Add(h,CHAR_INT(Length(h)),1);
if IO_Write(f,h) = fail then
return IO_Error;
else
return IO_OK;
fi;
end );
InstallGlobalFunction( IO_ReadSmallInt,
function( f )
local h,l;
l := IO_ReadBlock(f,1);
if l = "" or l = fail then return IO_Error; fi;
h := IO_ReadBlock(f,INT_CHAR(l[1]));
if h = fail or Length(h) < INT_CHAR(l[1]) then return IO_Error; fi;
return IntHexString(h);
end );
InstallGlobalFunction( IO_WriteAttribute,
# can also do properties
function( f, at, ob )
if IO_Pickle(f, Tester(at)(ob)) = IO_Error then return IO_Error; fi;
if Tester(at)(ob) then
if IO_Pickle(f, at(ob)) = IO_Error then return IO_Error; fi;
fi;
return IO_OK;
end );
InstallGlobalFunction( IO_ReadAttribute,
# can also do properties
function( f, at, ob )
local val;
val := IO_Unpickle(f);
if val = IO_Error then return IO_Error; fi;
if val = true then
val := IO_Unpickle(f);
if val = IO_Error then return IO_Error; fi;
Setter(at)(ob,val);
fi;
return IO_OK;
end );
InstallGlobalFunction( IO_PickleByString,
function( f, ob, tag )
local s;
s := String(ob);
if IO_Write(f,tag) = fail then return IO_Error; fi;
if IO_WriteSmallInt(f,Length(s)) = IO_Error then return IO_Error; fi;
if IO_Write(f,s) = fail then return IO_Error; fi;
return IO_OK;
end );
InstallGlobalFunction( IO_UnpickleByFunction,
function( unpickleFn )
return function( f )
local len,s;
len := IO_ReadSmallInt(f);
if len = IO_Error then return IO_Error; fi;
s := IO_ReadBlock(f,len);
if s = fail then return IO_Error; fi;
return unpickleFn(s);
end;
end );
InstallGlobalFunction( IO_UnpickleByEvalString,
IO_UnpickleByFunction(EvalString)
);
InstallGlobalFunction( IO_GenericObjectPickler,
function( f, tag, prepickle, ob, atts, filts, comps )
local at,com,fil,nr,o;
nr := IO_IsAlreadyPickled(ob);
if nr = false then # not yet known
if IO_Write(f,tag) = fail then return IO_Error; fi;
for o in prepickle do
if IO_Pickle(f,o) = IO_Error then return IO_Error; fi;
od;
nr := IO_AddToPickled(ob);
if nr <> false then
Error("prepickle objects had references to object - panic!");
return IO_Error;
fi;
for at in atts do
if IO_WriteAttribute(f,at,ob) = IO_Error then
IO_FinalizePickled();
return IO_Error;
fi;
od;
for fil in filts do
if IO_Pickle(f,fil(ob)) = IO_Error then
IO_FinalizePickled();
return IO_Error;
fi;
od;
for com in comps do
if IsBound(ob!.(com)) then
if IO_Pickle(f,com) = IO_Error then
IO_FinalizePickled();
return IO_Error;
fi;
if IO_Pickle(f,ob!.(com)) = IO_Error then
IO_FinalizePickled();
return IO_Error;
fi;
fi;
od;
IO_FinalizePickled();
if IO_Pickle(f,fail) = IO_Error then return IO_Error; fi;
return IO_OK;
else # this object was already pickled once!
if IO_Write(f,"SREF") = IO_Error then
return IO_Error;
fi;
if IO_WriteSmallInt(f,nr) = IO_Error then
return IO_Error;
fi;
return IO_OK;
fi;
end );
InstallGlobalFunction( IO_GenericObjectUnpickler,
function( f, ob, atts, filts )
local at,fil,val,val2;
IO_AddToUnpickled(ob);
for at in atts do
if IO_ReadAttribute(f,at,ob) = IO_Error then
IO_FinalizeUnpickled();
return IO_Error;
fi;
od;
for fil in filts do
val := IO_Unpickle(f);
if val = IO_Error then
IO_FinalizeUnpickled();
return IO_Error;
fi;
if val <> fil(ob) then
if val then
SetFilterObj(ob,fil);
else
ResetFilterObj(ob,fil);
fi;
fi;
od;
while true do
val := IO_Unpickle(f);
if val = fail then
IO_FinalizeUnpickled();
return ob;
fi;
if val = IO_Error then
IO_FinalizeUnpickled();
return IO_Error;
fi;
if IsString(val) then
val2 := IO_Unpickle(f);
if val2 = IO_Error then
IO_FinalizeUnpickled();
return IO_Error;
fi;
ob!.(val) := val2;
fi;
od;
end );
InstallMethod( IO_Unpickle, "for a file",
[ IsFile ],
function( f )
local magic,up;
magic := IO_ReadBlock(f,4);
if magic = fail then return IO_Error;
elif Length(magic) < 4 then return IO_Nothing;
fi;
if not(IsBound(IO_Unpicklers.(magic))) then
Info(InfoWarning, 1, "No unpickler for magic value \"",magic,"\"");
Info(InfoWarning,
1,
"Maybe you have to load a package for this to work?");
return IO_Error;
fi;
up := IO_Unpicklers.(magic);
if IsFunction(up) then
return up(f);
else
return up;
fi;
end );
InstallMethod(IO_Pickle, "for an object, pickle to string method",
[IsObject],
function(o)
local f,s;
s := EmptyString(1000000);
f := IO_WrapFD(-1,false,s);
IO_Pickle(f,o);
IO_Close(f);
ShrinkAllocationString(s);
return s;
end);
InstallMethod(IO_Unpickle, "for a string, unpickle from string method",
[IsStringRep],
function(s)
local f,o;
f := IO_WrapFD(-1,s,false);
o := IO_Unpickle(f);
IO_Close(f);
return o;
end);
InstallMethod( IO_Pickle, "for an integer",
[ IsFile, IsInt ],
function( f, i )
local h;
if IO_Write( f, "INTG" ) = fail then return IO_Error; fi;
h := HexStringInt(i);
if IO_WriteSmallInt( f, Length(h) ) = fail then return IO_Error; fi;
if IO_Write(f,h) = fail then return fail; fi;
return IO_OK;
end );
IO_Unpicklers.INTG :=
function( f )
local h,len;
len := IO_ReadSmallInt(f);
if len = IO_Error then return IO_Error; fi;
h := IO_ReadBlock(f,len);
if h = fail or Length(h) < len then return IO_Error; fi;
return IntHexString(h);
end;
InstallMethod( IO_Pickle, "for a string",
[ IsFile, IsStringRep and IsList ],
function( f, s )
local tag;
if IsMutable(s) then tag := "MSTR";
else tag := "ISTR"; fi;
if IO_Write(f,tag) = fail then return IO_Error; fi;
if IO_WriteSmallInt(f, Length(s)) = IO_Error then return IO_Error; fi;
if IO_Write(f,s) = fail then return IO_Error; fi;
return IO_OK;
end );
IO_Unpicklers.MSTR :=
function( f )
local len,s;
len := IO_ReadSmallInt(f);
if len = IO_Error then return IO_Error; fi;
s := IO_ReadBlock(f,len);
if s = fail or Length(s) < len then return IO_Error; fi;
return s;
end;
IO_Unpicklers.ISTR :=
function( f )
local s;
s := IO_Unpicklers.MSTR(f); if s = IO_Error then return IO_Error; fi;
MakeImmutable(s);
return s;
end;
InstallMethod( IO_Pickle, "for a boolean",
[ IsFile, IsBool ],
function( f, b )
local val;
if b = false then val := "FALS";
elif b = true then val := "TRUE";
elif b = fail then val := "FAIL";
else
Error("Unknown boolean value");
fi;
if IO_Write(f,val) = fail then
return IO_Error;
else
return IO_OK;
fi;
end );
IO_Unpicklers.FALS := false;
IO_Unpicklers.TRUE := true;
IO_Unpicklers.FAIL := fail;
IO_Unpicklers.SPRF :=
function( f )
Info(InfoWarning, 1, "unpickling deprecated 'SuPeRfail' value");
return "SuPeRfail";
end;
InstallMethod( IO_Pickle, "for a permutation",
[ IsFile, IsPerm ],
function( f, p )
return IO_PickleByString( f, p, "PERM" );
end );
IO_Unpicklers.PERM := IO_UnpickleByEvalString;
InstallMethod( IO_Pickle, "for a transformation",
[ IsFile, IsTransformation ],
function( f, t )
if IO_Write(f,"TRAN") = fail then return IO_Error; fi;
if IO_Pickle(f,ListTransformation(t)) = IO_Error then
return IO_Error;
fi;
return IO_OK;
end);
IO_Unpicklers.TRAN :=
function( f )
local l;
l := IO_Unpickle(f);
if l = IO_Error then return IO_Error; fi;
return TransformationList(l);
end;
InstallMethod( IO_Pickle, "for a partial perm",
[ IsFile, IsPartialPerm ],
function( f, pp )
local d;
d := DomainOfPartialPerm(pp);
if IO_Write(f,"PPER") = fail then return IO_Error; fi;
if IO_Pickle(f,d) = IO_Error then
return IO_Error;
fi;
if IO_Pickle(f,List(d, x -> x^pp)) = IO_Error then
return IO_Error;
fi;
return IO_OK;
end);
IO_Unpicklers.PPER :=
function( f )
local dom, im;
dom := IO_Unpickle(f);
if dom = IO_Error then return IO_Error; fi;
im := IO_Unpickle(f);
if im = IO_Error then return IO_Error; fi;
return PartialPerm(dom, im);
end;
InstallMethod( IO_Pickle, "for a float",
[ IsFile, IsFloat ],
function( f, fl )
return IO_PickleByString( f, fl, "FLOT" );
end );
IO_Unpicklers.FLOT := IO_UnpickleByFunction(Float);
InstallMethod( IO_Pickle, "for a character",
[ IsFile, IsChar ],
function(f, c)
local s;
s := "CHARx";
s[5] := c;
if IO_Write(f,s) = fail then return IO_Error; fi;
return IO_OK;
end );
IO_Unpicklers.CHAR :=
function( f )
local s;
s := IO_ReadBlock(f,1);
if s = fail or Length(s) < 1 then return IO_Error; fi;
return s[1];
end;
InstallMethod( IO_Pickle, "for a finite field element",
[ IsFile, IsFFE ],
function( f, ffe )
return IO_PickleByString( f, ffe, "FFEL" );
end );
IO_Unpicklers.FFEL := IO_UnpickleByEvalString;
InstallMethod( IO_Pickle, "for a cyclotomic",
[ IsFile, IsCyclotomic ],
function( f, cyc )
return IO_PickleByString( f, cyc, "CYCL" );
end );
IO_Unpicklers.CYCL := IO_UnpickleByEvalString;
InstallMethod( IO_Pickle, "for a list",
[ IsFile, IsList ],
function( f, l )
local count,i,nr,tag;
nr := IO_AddToPickled(l);
if nr = false then # not yet known
# Here we have to do something
if IsMutable(l) then tag := "M"; else tag := "I"; fi;
if IsGF2VectorRep(l) then Append(tag,"F2V");
elif Is8BitVectorRep(l) then Append(tag,"F8V");
elif IsGF2MatrixRep(l) then Append(tag,"F2M");
elif Is8BitMatrixRep(l) then Append(tag,"F8M");
else Append(tag,"LIS"); fi;
if IO_Write(f,tag) = fail then
IO_FinalizePickled();
return IO_Error;
fi;
if IO_WriteSmallInt(f,Length(l)) = IO_Error then
IO_FinalizePickled();
return IO_Error;
fi;
count := 0;
i := 1;
while i <= Length(l) do
if not(IsBound(l[i])) then
count := count + 1;
else
if count > 0 then
if IO_Write(f,"GAPL") = fail then
IO_FinalizePickled();
return IO_Error;
fi;
if IO_WriteSmallInt(f,count) = IO_Error then
IO_FinalizePickled();
return IO_Error;
fi;
count := 0;
fi;
if IO_Pickle(f,l[i]) = IO_Error then
IO_FinalizePickled();
return IO_Error;
fi;
fi;
i := i + 1;
od;
# Note that the last entry is always bound!
IO_FinalizePickled();
return IO_OK;
else
if IO_Write(f,"SREF") = IO_Error then
IO_FinalizePickled();
return IO_Error;
fi;
if IO_WriteSmallInt(f,nr) = IO_Error then
IO_FinalizePickled();
return IO_Error;
fi;
IO_FinalizePickled();
return IO_OK;
fi;
end );
IO_Unpicklers.MLIS :=
function( f )
local i,j,l,len,ob;
len := IO_ReadSmallInt(f);
if len = IO_Error then return IO_Error; fi;
l := 0*[1..len];
IO_AddToUnpickled(l);
i := 1;
while i <= len do
ob := IO_Unpickle(f);
if ob = IO_Error then
IO_FinalizeUnpickled();
return IO_Error;
fi;
# IO_OK or IO_Nothing cannot happen!
if IO_Result(ob) then
if ob!.val = "Gap" then # this is a Gap
for j in [0..ob!.nr-1] do
Unbind(l[i+j]);
od;
i := i + ob!.nr;
fi;
else
l[i] := ob;
i := i + 1;
fi;
od; # i is already incremented
IO_FinalizeUnpickled();
return l;
end;
IO_Unpicklers.ILIS :=
function( f )
local l;
l := IO_Unpicklers.MLIS(f); if l = IO_Error then return IO_Error; fi;
MakeImmutable(l);
return l;
end;
IO_Unpicklers.MF2V :=
function( f )
local v;
v := IO_Unpicklers.MLIS(f); if v = IO_Error then return IO_Error; fi;
ConvertToVectorRep(v,2);
return v;
end;
IO_Unpicklers.MF8V :=
function( f )
local v;
v := IO_Unpicklers.MLIS(f); if v = IO_Error then return IO_Error; fi;
ConvertToVectorRep(v);
return v;
end;
IO_Unpicklers.IF2V :=
function( f )
local v;
v := IO_Unpicklers.MLIS(f); if v = IO_Error then return IO_Error; fi;
ConvertToVectorRep(v);
MakeImmutable(v);
return v;
end;
IO_Unpicklers.IF8V :=
function( f )
local v;
v := IO_Unpicklers.MLIS(f); if v = IO_Error then return IO_Error; fi;
ConvertToVectorRep(v);
MakeImmutable(v);
return v;
end;
IO_Unpicklers.MF2M :=
function( f )
local v;
v := IO_Unpicklers.MLIS(f); if v = IO_Error then return IO_Error; fi;
ConvertToMatrixRep(v,2);
return v;
end;
IO_Unpicklers.MF8M :=
function( f )
local v;
v := IO_Unpicklers.MLIS(f); if v = IO_Error then return IO_Error; fi;
ConvertToMatrixRep(v);
return v;
end;
IO_Unpicklers.IF2M :=
function( f )
local v;
v := IO_Unpicklers.MLIS(f); if v = IO_Error then return IO_Error; fi;
ConvertToMatrixRep(v);
MakeImmutable(v);
return v;
end;
IO_Unpicklers.IF8M :=
function( f )
local v;
v := IO_Unpicklers.MLIS(f); if v = IO_Error then return IO_Error; fi;
ConvertToMatrixRep(v);
MakeImmutable(v);
return v;
end;
IO_Unpicklers.GAPL :=
function( f )
local ob;
ob := rec( val := "Gap", nr := IO_ReadSmallInt(f) );
if ob.nr = IO_Error then
return IO_Error;
fi;
return Objectify( NewType( IO_ResultsFamily, IO_Result ), ob );
end;
IO_Unpicklers.SREF :=
function( f )
local nr;
nr := IO_ReadSmallInt(f); if nr = IO_Error then return IO_Error; fi;
if not(IsBound(IO_PICKLECACHE.obs[nr])) then
Print("Found a self-reference to an unknown object!\n");
return IO_Error;
fi;
return IO_PICKLECACHE.obs[nr];
end;
InstallMethod( IO_Pickle, "for a range",
[ IsFile, IsList and IsRangeRep ],
function( f, rng )
local tag;
# Do not deal with empty or trivial ranges
# (if they ever get the filters in question,
# note that 'ConvertToRangeRep' does not set it).
if Length( rng ) < 2 then
TryNextMethod();
fi;
if IsMutable( rng ) then
tag:= "MRNG";
else
tag:= "IRNG";
fi;
if IO_Write( f, tag ) = fail then
return IO_Error;
elif IO_WriteSmallInt( f, rng[1] ) = IO_Error then
return IO_Error;
elif IO_WriteSmallInt( f, rng[2] ) = IO_Error then
return IO_Error;
elif IO_WriteSmallInt( f, rng[ Length( rng ) ] ) = IO_Error then
return IO_Error;
fi;
return IO_OK;
end );
IO_Unpicklers.MRNG:= function( f )
local first, second, last;
first:= IO_ReadSmallInt( f );
if first = IO_Error then
return IO_Error;
fi;
second:= IO_ReadSmallInt( f );
if second = IO_Error then
return IO_Error;
fi;
last:= IO_ReadSmallInt( f );
if last = IO_Error then
return IO_Error;
fi;
return [ first, second .. last ];
end;
IO_Unpicklers.IRNG:= function( f )
local l;
l:= IO_Unpicklers.MRNG( f );
if l = IO_Error then
return IO_Error;
fi;
MakeImmutable( l );
return l;
end;
InstallMethod( IO_Pickle, "for a record",
[ IsFile, IsRecord ],
function( f, r )
local n,names,nr,tag;
nr := IO_AddToPickled(r);
if nr = false then # not yet known
# Here we have to do something
if IsMutable(r) then tag := "MREC";
else tag := "IREC"; fi;
if IO_Write(f,tag) = fail then
IO_FinalizePickled();
return IO_Error;
fi;
names := RecNames(r);
if IO_WriteSmallInt(f,Length(names)) = IO_Error then
IO_FinalizePickled();
return IO_Error;
fi;
for n in names do
if IO_Pickle(f,n) = IO_Error then
IO_FinalizePickled();
return IO_Error;
fi;
if IO_Pickle(f,r.(n)) = IO_Error then
IO_FinalizePickled();
return IO_Error;
fi;
od;
IO_FinalizePickled();
return IO_OK;
else
if IO_Write(f,"SREF") = IO_Error then
IO_FinalizePickled();
return IO_Error;
fi;
if IO_WriteSmallInt(f,nr) = IO_Error then
IO_FinalizePickled();
return IO_Error;
fi;
IO_FinalizePickled();
return IO_OK;
fi;
end );
IO_Unpicklers.MREC :=
function( f )
local i,len,name,ob,r;
len := IO_ReadSmallInt(f);
if len = IO_Error then return IO_Error; fi;
r := rec();
IO_AddToUnpickled(r);
for i in [1..len] do
name := IO_Unpickle(f);
if name = IO_Error or not(IsString(name)) then
IO_FinalizeUnpickled();
return IO_Error;
fi;
ob := IO_Unpickle(f);
if IO_Result(ob) then
if ob = IO_Error then
IO_FinalizeUnpickled();
return IO_Error;
fi;
else
r.(name) := ob;
fi;
od;
IO_FinalizeUnpickled();
return r;
end;
IO_Unpicklers.IREC :=
function( f )
local r;
r := IO_Unpicklers.MREC(f); if r = IO_Error then return IO_Error; fi;
MakeImmutable(r);
return r;
end;
InstallMethod( IO_Pickle, "IO_Results are forbidden",
[ IsFile, IO_Result ],
function( f, ob )
Print("Pickling of IO_Result is forbidden!\n");
return IO_Error;
end );
InstallMethod( IO_Pickle, "for rational functions",
[ IsFile, IsPolynomialFunction and IsRationalFunctionDefaultRep ],
function( f, pol )
local num,den,one;
one := One(CoefficientsFamily(FamilyObj(pol)));
num := ExtRepNumeratorRatFun(pol);
den := ExtRepDenominatorRatFun(pol);
if IO_Write(f,"RATF") = fail then return IO_Error; fi;
if IO_Pickle(f,one) = IO_Error then return IO_Error; fi;
if IO_Pickle(f,num) = IO_Error then return IO_Error; fi;
if IO_Pickle(f,den) = IO_Error then return IO_Error; fi;
return IO_OK;
end );
IO_Unpicklers.RATF :=
function( f )
local num,den,one,poly;
one := IO_Unpickle(f);
if one = IO_Error then return IO_Error; fi;
num := IO_Unpickle(f);
if num = IO_Error then return IO_Error; fi;
den := IO_Unpickle(f);
if den = IO_Error then return IO_Error; fi;
poly := RationalFunctionByExtRepNC(
RationalFunctionsFamily(FamilyObj(one)),num,den);
return poly;
end;
InstallMethod( IO_Pickle, "for rational functions",
[ IsFile, IsPolynomialFunction and IsPolynomialDefaultRep ],
function( f, pol )
local num,one;
one := One(CoefficientsFamily(FamilyObj(pol)));
num := ExtRepNumeratorRatFun(pol);
if IO_Write(f,"POLF") = fail then return IO_Error; fi;
if IO_Pickle(f,one) = IO_Error then return IO_Error; fi;
if IO_Pickle(f,num) = IO_Error then return IO_Error; fi;
return IO_OK;
end );
IO_Unpicklers.POLF :=
function( f )
local num,one,poly;
one := IO_Unpickle(f);
if one = IO_Error then return IO_Error; fi;
num := IO_Unpickle(f);
if num = IO_Error then return IO_Error; fi;
poly := PolynomialByExtRepNC(
RationalFunctionsFamily(FamilyObj(one)),num);
return poly;
end;
# This is for compatibility only and will go eventually:
IO_Unpicklers.POLY :=
function( f )
local ext,one,poly;
one := IO_Unpickle(f);
if one = IO_Error then return IO_Error; fi;
ext := IO_Unpickle(f);
if ext = IO_Error then return IO_Error; fi;
poly := PolynomialByExtRepNC( RationalFunctionsFamily(FamilyObj(one)),ext);
IsUnivariatePolynomial(poly); # to make it learn
IsLaurentPolynomial(poly); # to make it learn
return poly;
end;
InstallMethod( IO_Pickle, "for a univariate Laurent polynomial",
[ IsFile, IsLaurentPolynomial and IsLaurentPolynomialDefaultRep ],
function( f, pol )
local cofs,one,ind;
one := One(CoefficientsFamily(FamilyObj(pol)));
cofs := CoefficientsOfLaurentPolynomial(pol);
ind := IndeterminateNumberOfLaurentPolynomial(pol);
if IO_Write(f,"UPOL") = fail then return IO_Error; fi;
if IO_Pickle(f,one) = IO_Error then return IO_Error; fi;
if IO_Pickle(f,cofs) = IO_Error then return IO_Error; fi;
if IO_Pickle(f,ind) = IO_Error then return IO_Error; fi;
return IO_OK;
end );
IO_Unpicklers.UPOL :=
function( f )
local cofs,one,ind,poly;
one := IO_Unpickle(f);
if one = IO_Error then return IO_Error; fi;
cofs := IO_Unpickle(f);
if cofs = IO_Error then return IO_Error; fi;
ind := IO_Unpickle(f);
if ind = IO_Error then return IO_Error; fi;
poly := LaurentPolynomialByCoefficients(FamilyObj(one),cofs[1],cofs[2],ind);
return poly;
end;
InstallMethod( IO_Pickle, "for a univariate rational function",
[ IsFile,
IsUnivariateRationalFunction and IsUnivariateRationalFunctionDefaultRep ],
function( f, pol )
local cofs,one,ind;
one := One(CoefficientsFamily(FamilyObj(pol)));
cofs := CoefficientsOfUnivariateRationalFunction(pol);
ind := IndeterminateNumberOfUnivariateRationalFunction(pol);
if IO_Write(f,"URFU") = fail then return IO_Error; fi;
if IO_Pickle(f,one) = IO_Error then return IO_Error; fi;
if IO_Pickle(f,cofs) = IO_Error then return IO_Error; fi;
if IO_Pickle(f,ind) = IO_Error then return IO_Error; fi;
return IO_OK;
end );
IO_Unpicklers.URFU :=
function( f )
local cofs,one,ind,poly;
one := IO_Unpickle(f);
if one = IO_Error then return IO_Error; fi;
cofs := IO_Unpickle(f);
if cofs = IO_Error then return IO_Error; fi;
ind := IO_Unpickle(f);
if ind = IO_Error then return IO_Error; fi;
poly := UnivariateRationalFunctionByCoefficients(
FamilyObj(one),cofs[1],cofs[2],cofs[3],ind);
return poly;
end;
InstallMethod( IO_Pickle, "for a straight line program",
[ IsFile, IsStraightLineProgram ],
function( f, s )
if IO_Write(f,"GSLP") = fail then return IO_Error; fi;
if IO_Pickle(f,LinesOfStraightLineProgram(s)) = IO_Error then
return IO_Error;
fi;
if IO_Pickle(f,NrInputsOfStraightLineProgram(s)) = IO_Error then
return IO_Error;
fi;
return IO_OK;
end);
IO_Unpicklers.GSLP :=
function( f )
local l,n,s;
l := IO_Unpickle(f);
if l = IO_Error then return IO_Error; fi;
n := IO_Unpickle(f);
if l = IO_Error then return IO_Error; fi;
s := StraightLineProgramNC(l,n);
return s;
end;
InstallMethod( IO_Pickle, "for the global random source",
[ IsFile, IsRandomSource and IsGlobalRandomSource ],
function( f, r )
local s;
if IO_Write(f,"RSGL") = fail then return IO_Error; fi;
s := State(r);
if IO_Pickle(f,s) = IO_Error then return IO_Error; fi;
return IO_OK;
end );
IO_Unpicklers.RSGL :=
function( f )
local s;
s := IO_Unpickle(f);
if s = IO_Error then return IO_Error; fi;
return RandomSource(IsGlobalRandomSource,s);
end;
InstallMethod( IO_Pickle, "for a GAP random source",
[ IsFile, IsRandomSource and IsGAPRandomSource ],
function( f, r )
local s;
if IO_Write(f,"RSGA") = fail then return IO_Error; fi;
s := State(r);
if IO_Pickle(f,s) = IO_Error then return IO_Error; fi;
return IO_OK;
end );
IO_Unpicklers.RSGA :=
function( f )
local s;
s := IO_Unpickle(f);
if s = IO_Error then return IO_Error; fi;
return RandomSource(IsGAPRandomSource,s);
end;
InstallMethod( IO_Pickle, "for a Mersenne twister random source",
[ IsFile, IsRandomSource and IsMersenneTwister ],
function( f, r )
local s;
if IO_Write(f,"RSMT") = fail then return IO_Error; fi;
s := State(r);
if IO_Pickle(f,s) = IO_Error then return IO_Error; fi;