Defer triggering derivations until Finalize

ActionsForCAP/PackageInfo.g

@@ -10,7 +10,7 @@ SetPackageInfo( rec(
 
 PackageName := "ActionsForCAP",
 Subtitle := "Actions and Coactions for CAP",
-Version := "2024.08-02",
+Version := "2024.09-01",
 Date := (function ( ) if IsBound( GAPInfo.SystemEnvironment.GAP_PKG_RELEASE_DATE ) then return GAPInfo.SystemEnvironment.GAP_PKG_RELEASE_DATE; else return Concatenation( ~.Version{[ 1 .. 4 ]}, "-", ~.Version{[ 6, 7 ]}, "-01" ); fi; end)( ),
 License := "GPL-2.0-or-later",
 

ActionsForCAP/examples/IndirectionTest.g

@@ -91,7 +91,6 @@ category_with_attributes_record := rec(
 triple := EnhancementWithAttributes( category_with_attributes_record );;
 indirection_category := triple[1];;
 SetIsAbelianCategory( indirection_category, true );;
-Reevaluate( indirection_category!.derivations_weight_list );
 AddIsEqualForObjects( indirection_category, function( cat, obj1, obj2 ) return UnderlyingCell( obj1 ) = UnderlyingCell( obj2 ); end );;
 AddIsEqualForMorphisms( indirection_category, function( cat, mor1, mor2 ) return IsIdenticalObj( mor1, mor2 ); end );;
 AddIsCongruentForMorphisms( indirection_category, function( cat, mor1, mor2 ) return UnderlyingCell( mor1 ) = UnderlyingCell( mor2 ); end );;

CAP/PackageInfo.g

@@ -10,7 +10,7 @@ SetPackageInfo( rec(
 
 PackageName := "CAP",
 Subtitle := "Categories, Algorithms, Programming",
-Version := "2024.09-24",
+Version := "2024.09-25",
 Date := (function ( ) if IsBound( GAPInfo.SystemEnvironment.GAP_PKG_RELEASE_DATE ) then return GAPInfo.SystemEnvironment.GAP_PKG_RELEASE_DATE; else return Concatenation( ~.Version{[ 1 .. 4 ]}, "-", ~.Version{[ 6, 7 ]}, "-01" ); fi; end)( ),
 License := "GPL-2.0-or-later",
 

CAP/gap/Derivations.gi

@@ -538,13 +538,6 @@ function( owl, op_name, new_weight )
     owl!.operation_weights.( op_name ) := new_weight;
     owl!.operation_derivations.( op_name ) := fail;
 
-    # if the weight has not changed, there is no need to re-trigger the chain of derivations
-    if new_weight <> current_weight then
-
-        InstallDerivationsUsingOperation( owl, op_name );
-
-    fi;
-
 end );
 
 InstallMethod( PrintDerivationTree,

CAP/gap/Finalize.gi

@@ -292,7 +292,7 @@ InstallMethod( Finalize,
     [ "FinalizeCategory", true ],
   ],
   function( CAP_NAMED_ARGUMENTS, category )
-    local derivation_list, weight_list, current_install, current_final_derivation, op_name, new_weight, current_weight, old_weights, categorical_properties, diff, properties_with_logic, property, i, derivation, operation, property_name, installed_operations_of_homomorphism_structure, original_REORDER_METHODS_SUSPENSION_LEVEL;
+    local derivation_list, weight_list, current_install, current_final_derivation, op_name, new_weight, current_weight, old_weights, properties_with_logic, property, i, derivation, operation, property_name, installed_operations_of_homomorphism_structure, original_REORDER_METHODS_SUSPENSION_LEVEL;
 
     if IsFinalized( category ) then
 
@@ -306,15 +306,6 @@ InstallMethod( Finalize,
 
     fi;
 
-    # prepare for the checks below (usually this is done when the first add function is called, but we support the case that no add function is called at all)
-    if not IsBound( category!.initially_known_categorical_properties ) then
-
-        category!.initially_known_categorical_properties := ShallowCopy( ListKnownCategoricalProperties( category ) );
-
-        InstallDerivationsUsingOperation( category!.derivations_weight_list, "none" );
-
-    fi;
-
     # Warn about categories marked as being computable but not having an implementation of IsCongruentForMorphisms.
     # Since IsCongruentForMorphisms currently is derived from IsEqualForMorphisms, the latter also has to be taken into account.
     if category!.is_computable and not CanCompute( category, "IsEqualForMorphisms" ) and not CanCompute( category, "IsCongruentForMorphisms") then
@@ -339,6 +330,18 @@ InstallMethod( Finalize,
 
     weight_list := category!.derivations_weight_list;
 
+    InstallDerivationsUsingOperation( weight_list, "none" );
+
+    for op_name in SortedList( RecNames( weight_list!.operation_weights ) ) do
+
+        if weight_list!.operation_weights.(op_name) <> infinity and weight_list!.operation_derivations.(op_name) = fail then
+
+            InstallDerivationsUsingOperation( weight_list, op_name );
+
+        fi;
+
+    od;
+
     while true do
 
         current_install := fail;
@@ -429,45 +432,24 @@ InstallMethod( Finalize,
 
     od;
 
-    if category!.overhead then
-
-        # Check if reevaluation triggers new derivations. Derivations are installed recursively by `InstallDerivationsUsingOperation`, so this should never happen.
-        # See the WARNING below for possible causes why it still might happen.
-        old_weights := StructuralCopy( weight_list!.operation_weights );
-
-        Info( DerivationInfo, 1, "Starting reevaluation of derivation weight list of the category name \"", Name( category ), "\"\n" );
-
-        Reevaluate( weight_list );
-
-        Info( DerivationInfo, 1, "Finished reevaluation of derivation weight list of the category name \"", Name( category ), "\"\n" );
-
-        categorical_properties := ListKnownCategoricalProperties( category );
-
-        if not IsSubset( categorical_properties, category!.initially_known_categorical_properties ) then
-
-            Print( "WARNING: The category named \"", Name( category ), "\" has lost the following categorical properties since installation of the first function:\n" );
-            Display( Difference( category!.initially_known_categorical_properties, categorical_properties ) );
-
-        fi;
+    # TODO: remove once this check has passed the CI of all packages
+    # Check if reevaluation triggers new derivations. Derivations are installed recursively by `InstallDerivationsUsingOperation`, so this should never happen.
+    # See the WARNING below for possible causes why it still might happen.
+    old_weights := StructuralCopy( weight_list!.operation_weights );
+
+    Info( DerivationInfo, 1, "Starting reevaluation of derivation weight list of the category name \"", Name( category ), "\"\n" );
+
+    Reevaluate( weight_list );
+
+    Info( DerivationInfo, 1, "Finished reevaluation of derivation weight list of the category name \"", Name( category ), "\"\n" );
+
+    if weight_list!.operation_weights <> old_weights then
 
-        if weight_list!.operation_weights <> old_weights then
-
-            Print( "WARNING: The installed derivations of the category named \"", Name( category ), "\" have changed by reevaluation, which is not expected at this point.\n" );
-            Print( "This might be due to one of the following reasons:\n" );
-            Print( "* The category might have gained a new setting like `supports_empty_limits` since adding the first function. Such settings should always be set before adding functions.\n" );
-            Print( "* The category filter of some derivation might not fulfill the specification.\n" );
-
-            diff := Difference( categorical_properties, category!.initially_known_categorical_properties );
-
-            if not IsEmpty( diff ) then
-
-                Print( "* The category has gained the following new categorical properties since adding the first function: ", diff, ". Properties should always be set before adding functions for operations which might trigger derivations involving the properties.\n" );
-
-            fi;
-
-            Print( "For debugging, call `ActivateDerivationInfo( )`, retry, and look at the derivations between \"Starting reevaluation of ...\" and \"Finished reevaluation of ...\".\n" );
-
-        fi;
+        Print( "WARNING: The installed derivations of the category named \"", Name( category ), "\" have changed by reevaluation, which is not expected at this point.\n" );
+        Print( "This might be due to one of the following reasons:\n" );
+        Print( "* The category might have gained a new setting like `supports_empty_limits` since adding the first function. Such settings should always be set before adding functions.\n" );
+        Print( "* The category filter of some derivation might not fulfill the specification.\n" );
+        Print( "For debugging, call `ActivateDerivationInfo( )`, retry, and look at the derivations between \"Starting reevaluation of ...\" and \"Finished reevaluation of ...\".\n" );
 
     fi;
 

CAP/gap/InstallAdds.gi

@@ -47,15 +47,6 @@ InstallMethod( AddCapOperation,
 
     fi;
 
-    # prepare for the checks in Finalize
-    if not IsBound( category!.initially_known_categorical_properties ) then
-
-        category!.initially_known_categorical_properties := ShallowCopy( ListKnownCategoricalProperties( category ) );
-
-        InstallDerivationsUsingOperation( category!.derivations_weight_list, "none" );
-
-    fi;
-
     if weight = -1 then
         weight := 100;
     fi;

FreydCategoriesForCAP/PackageInfo.g

@@ -10,7 +10,7 @@ SetPackageInfo( rec(
 
 PackageName := "FreydCategoriesForCAP",
 Subtitle := "Freyd categories - Formal (co)kernels for additive categories",
-Version := "2024.09-08",
+Version := "2024.09-09",
 Date := (function ( ) if IsBound( GAPInfo.SystemEnvironment.GAP_PKG_RELEASE_DATE ) then return GAPInfo.SystemEnvironment.GAP_PKG_RELEASE_DATE; else return Concatenation( ~.Version{[ 1 .. 4 ]}, "-", ~.Version{[ 6, 7 ]}, "-01" ); fi; end)( ),
 License := "GPL-2.0-or-later",
 

FreydCategoriesForCAP/gap/AdditiveClosure.gi

@@ -1070,7 +1070,7 @@ InstallGlobalFunction( INSTALL_FUNCTIONS_FOR_ADDITIVE_CLOSURE,
         SetRangeCategoryOfHomomorphismStructure( category, range_category );
         SetIsEquippedWithHomomorphismStructure( category, true );
 
-        if ForAll( [ "DirectSum" ], f -> CanCompute( range_category, f ) ) and
+        if (ForAll( [ "DirectSum" ], f -> CanCompute( range_category, f ) ) or IsIdenticalObj( range_category, category )) and
            ForAll( [ "HomomorphismStructureOnObjects" ], f -> CanCompute( underlying_category, f ) ) then
 
             ##
@@ -1090,7 +1090,7 @@ InstallGlobalFunction( INSTALL_FUNCTIONS_FOR_ADDITIVE_CLOSURE,
         fi;
 
         # legacy
-        if ForAll( [ "MorphismBetweenDirectSumsWithGivenDirectSums" ], f -> CanCompute( range_category, f ) ) and
+        if (ForAll( [ "MorphismBetweenDirectSumsWithGivenDirectSums" ], f -> CanCompute( range_category, f ) ) or IsIdenticalObj( range_category, category )) and
            ForAll( [ "HomomorphismStructureOnMorphismsWithGivenObjects" ], f -> CanCompute( underlying_category, f ) ) and
            not (IsBound( range_category!.supports_empty_limits ) and range_category!.supports_empty_limits = true) then
 
@@ -1130,7 +1130,7 @@ InstallGlobalFunction( INSTALL_FUNCTIONS_FOR_ADDITIVE_CLOSURE,
 
         fi;
 
-        if ForAll( [ "MorphismBetweenDirectSumsWithGivenDirectSums" ], f -> CanCompute( range_category, f ) )
+        if (ForAll( [ "MorphismBetweenDirectSumsWithGivenDirectSums" ], f -> CanCompute( range_category, f ) ) or IsIdenticalObj( range_category, category ))
            and ForAll( [ "HomomorphismStructureOnMorphismsWithGivenObjects" ], f -> CanCompute( underlying_category, f ) )
            and IsBound( range_category!.supports_empty_limits ) and range_category!.supports_empty_limits = true then
 
@@ -1208,9 +1208,9 @@ InstallGlobalFunction( INSTALL_FUNCTIONS_FOR_ADDITIVE_CLOSURE,
 
         fi;
 
-        if ForAll( [ "UniversalMorphismIntoZeroObject",
+        if (ForAll( [ "UniversalMorphismIntoZeroObject",
                      "UniversalMorphismIntoDirectSum" ],
-                     f -> CanCompute( range_category, f ) ) and
+                     f -> CanCompute( range_category, f ) ) or IsIdenticalObj( range_category, category )) and
            ForAll( [ "DistinguishedObjectOfHomomorphismStructure",
                          "InterpretMorphismAsMorphismFromDistinguishedObjectToHomomorphismStructure" ],
                          f -> CanCompute( underlying_category, f ) ) and
@@ -1245,8 +1245,8 @@ InstallGlobalFunction( INSTALL_FUNCTIONS_FOR_ADDITIVE_CLOSURE,
 
         fi;
 
-        if ForAll( [ "UniversalMorphismIntoDirectSum" ],
-                     f -> CanCompute( range_category, f ) ) and
+        if (ForAll( [ "UniversalMorphismIntoDirectSum" ],
+                     f -> CanCompute( range_category, f ) ) or IsIdenticalObj( range_category, category )) and
            ForAll( [ "DistinguishedObjectOfHomomorphismStructure",
                          "InterpretMorphismAsMorphismFromDistinguishedObjectToHomomorphismStructure" ],
                          f -> CanCompute( underlying_category, f ) ) and
@@ -1297,9 +1297,9 @@ InstallGlobalFunction( INSTALL_FUNCTIONS_FOR_ADDITIVE_CLOSURE,
         if ForAll( [ "HomomorphismStructureOnObjects",
                      "InterpretMorphismFromDistinguishedObjectToHomomorphismStructureAsMorphism" ],
                      f -> CanCompute( underlying_category, f ) ) and
-           ForAll( [ "PreCompose",
+           (ForAll( [ "PreCompose",
                          "ProjectionInFactorOfDirectSum" ],
-                         f -> CanCompute( range_category, f ) ) then
+                         f -> CanCompute( range_category, f ) ) or IsIdenticalObj( range_category, category )) then
 
             ##
             AddInterpretMorphismFromDistinguishedObjectToHomomorphismStructureAsMorphism( category,

FreydCategoriesForCAP/gap/CategoryOfRows.gi

@@ -41,9 +41,6 @@ InstallMethod( CategoryOfRows,
 
         SetIsRigidSymmetricCoclosedMonoidalCategory( cat, true );
 
-        # since methods have been added before, we have to reevaluate the derivations
-        Reevaluate( cat!.derivations_weight_list );
-
     fi;
 
     INSTALL_FUNCTIONS_FOR_CATEGORY_OF_ROWS( cat );

FreydCategoriesForCAP/gap/CategoryOfRows_as_AdditiveClosure_RingAsCategory.gi

@@ -30,8 +30,7 @@ InstallMethod( CategoryOfRows_as_AdditiveClosure_RingAsCategory,
     # These ring properties should actually be propagated to some categorical properties of `ring_as_category`
     # which the AdditiveClosure can use generically.
     # However, such categorical properties do not (yet) exist, so we have to set the categorical properties
-    # a posteriori here. Afterwards, we have to reevaluate the derivations because they might have changed
-    # by setting the properties.
+    # a posteriori here.
     if HasHasInvariantBasisProperty( homalg_ring ) and HasInvariantBasisProperty( homalg_ring ) then
 
         SetIsSkeletalCategory( add, true );
@@ -50,8 +49,6 @@ InstallMethod( CategoryOfRows_as_AdditiveClosure_RingAsCategory,
 
     fi;
 
-    Reevaluate( add!.derivations_weight_list );
-
     Finalize( add );