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Quelle methsel2.g
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#############################################################################
##
## This file is part of GAP, a system for computational discrete algebra.
## This file's authors include Steve Linton, Hans Ulrich Besche, Max Neuenhoeffer.
##
## 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
##
## This file defines some functions associated with method selection,
## which do not need to be compiled by default. More performance critical
## functions are implemented in the kernel.
##
# gaplint: disable=analyse-lvars
## This is a dirty hack, because this function is defined only later:
ApplicableMethod := fail;
## See below for the other part of it!
#############################################################################
##
#F HANDLE_METHOD_NOT_FOUND( <information> ) . . . raise the method not
##
## <ManSection>
## <Func Name="HANDLE_METHOD_NOT_FOUND" Arg='information'/>
##
## <Description>
## found error
## <P/>
## <A>information</A> is a plain record passed by the kernel when no
## method is found. Components so far defined are:
## <P/>
## .Operation -- the operation called
## .Arguments -- the arguments as a plain (immutable) list
## .isVerbose -- if the operation was being traced
## .isConstructor -- if the operation is a constructor
## .Precedence -- the "precedence" of the method sought 0 for
## first choice, 1 after one TryNextMethod(), etc.
## </Description>
## </ManSection>
##
HANDLE_METHOD_NOT_FOUND := function ( INF )
local no_method_found, linebreak, ShowArguments, ShowArgument, ShowDetails, ShowMethods,
ShowOtherMethods, argument_index;
#############################################################################
##
#F ShowArguments( ) . . . . . . . . . . . . . . . . . . . . . . . . . . . .
##
## <#GAPDoc Label="ShowArguments">
## <ManSection>
## <Func Name="ShowArguments" Arg=''/>
##
## <Description>
## This function is only available within a break loop caused by a <Q>No
## Method Found</Q>-error. It prints as a list the arguments of the operation
## call for which no method was found.
## <!-- %% <C>ShowArguments</C> can -->
## <!-- %% be called with any number of arguments. They are ignored. -->
## </Description>
## </ManSection>
## <#/GAPDoc>
##
ShowArguments := function( arg )
Print( INF.Arguments, "\n" );
end;
#############################################################################
##
#F ShowArgument(<nr>) . . . . . . . . . . . . . . . . . . . . . . . . . . .
##
## <#GAPDoc Label="ShowArgument">
## <ManSection>
## <Func Name="ShowArgument" Arg='nr'/>
##
## <Description>
## This function is only available within a break loop caused by a <Q>No
## Method Found</Q>-error.
## It prints the <A>nr</A>-th arguments of the operation call
## for which no method was found.
## <Ref Func="ShowArgument"/> needs exactly one
## argument which is an integer between 0 and the number of arguments the
## operation was called with.
## </Description>
## </ManSection>
## <#/GAPDoc>
##
ShowArgument := function( arg )
if LENGTH(arg) <> 1 or not IS_INT(arg[1]) or arg[1] <= 0
or arg[1] > LENGTH(INF.Arguments) then
Print( "Usage: `ShowArgument( <nr> )' where <nr> is an integer between ",
1," and ",LENGTH(INF.Arguments),"\n");
else
Print( INF.Arguments[arg[1]], "\n" );
fi;
end;
#############################################################################
##
#F ShowDetails( ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
##
## <#GAPDoc Label="ShowDetails">
## <ManSection>
## <Func Name="ShowDetails" Arg=''/>
##
## <Description>
## This function is only available within a break loop caused by a <Q>No
## Method Found</Q>-error. It prints the details of this error: The
## operation, the number of arguments, a flag which indicates whether the
## operation is being traced, a flag which indicates whether the
## operation is a constructor method, and the number of methods that
## refused to apply by calling <Ref Func="TryNextMethod"/>.
## The last number is called <C>Choice</C> and is printed as an ordinal.
## So if exactly <M>k</M> methods were found but called
## <Ref Func="TryNextMethod"/> and there were no more methods
## it says <C>Choice: </C><M>k</M><C>th</C>.
## </Description>
## </ManSection>
## <#/GAPDoc>
##
## %% `ShowDetails' can be called with any number of
## %% arguments. They are ignored.
##
ShowDetails := function( arg )
Print( "--------------------------------------------\n");
Print( "Information about a `No method found'-error:\n");
Print( "--------------------------------------------\n");
Print( "Operation : ", NAME_FUNC( INF.Operation ), "\n" );
Print( "Number of Arguments : ", LENGTH( INF.Arguments ), "\n" );
Print( "Operation traced : ", INF.isVerbose, "\n" );
Print( "IsConstructor : ", INF.isConstructor, "\n" );
Print( "Choice : ", Ordinal(INF.Precedence+1), "\n" );
end;
#############################################################################
##
#F ShowMethods( [<verbosity>] ) . . . . . . . . . . . . . . . . . . . . . .
##
## <#GAPDoc Label="ShowMethods">
## <ManSection>
## <Func Name="ShowMethods" Arg='[verbosity]'/>
##
## <Description>
## This function is only available within a break loop caused by a <Q>No
## Method Found</Q>-error. It prints an overview about the installed methods
## for those arguments the operation was called with (using
## <Ref Sect="sect:ApplicableMethod"/>. The verbosity can be
## controlled by the optional integer parameter <A>verbosity</A>. The default
## is 2, which lists all applicable methods. With verbosity 1
## <Ref Func="ShowMethods"/> only shows the number of installed methods and the
## methods matching, which can only be those that were already called but
## refused to work by calling <Ref Func="TryNextMethod"/>.
## With verbosity 3 not only
## all installed methods but also the reasons why they do not match are
## displayed.
## </Description>
## </ManSection>
## <#/GAPDoc>
##
ShowMethods := function( arg )
local verbosity;
if LENGTH(arg) <> 1 or not IS_INT(arg[1]) then
verbosity := 2;
elif arg[1] < 1 then
verbosity := 1;
else
verbosity := arg[1];
fi;
ApplicableMethod( INF.Operation, INF.Arguments, verbosity, "all" );
end;
#############################################################################
##
#F ShowOtherMethods( [<verbosity>] ) . . . . . . . . . . . . . . . . . . . .
##
## <#GAPDoc Label="ShowOtherMethods">
## <ManSection>
## <Func Name="ShowOtherMethods" Arg='[verbosity]'/>
##
## <Description>
## This function is only available within a break loop caused by a <Q>No
## Method Found</Q>-error. It prints an overview about the installed methods
## for a different number of arguments than the number of arguments the
## operation was called with (using <Ref Sect="sect:ApplicableMethod"/>.
## The verbosity can be controlled by the optional
## integer parameter <A>verbosity</A>. The default is 1 which lists only the
## number of applicable methods.
## With verbosity 2 <Ref Func="ShowOtherMethods"/> lists
## all installed methods and with verbosity 3 also the reasons, why they
## are not applicable.
## Calling <Ref Func="ShowOtherMethods"/> with verbosity 3 in this
## function will normally not make any sense, because the different
## numbers of arguments are simulated by supplying the corresponding
## number of ones, for which normally no reasonable methods will be
## installed.
## </Description>
## </ManSection>
## <#/GAPDoc>
##
ShowOtherMethods := function( arg )
local verbosity, i, l, args;
if LENGTH(arg) <> 1 or not IS_INT(arg[1]) then
verbosity := 1;
elif arg[1] < 1 then
verbosity := 1;
else
verbosity := arg[1];
fi;
l := [0..6];
args := [];
for i in l do
if i <> LENGTH( INF.Arguments ) then
ApplicableMethod( INF.Operation, args, verbosity, "all" );
Print( "\n" );
fi;
ADD_LIST(args,1);
od;
end;
# Remember, we are in the function `HANDLE_METHOD_NOT_FOUND'!
no_method_found := "";
APPEND_LIST(no_method_found,
"no method found! For debugging hints type ?Recovery from NoMethodFound\n" );
APPEND_LIST(no_method_found, "Error, no ");
APPEND_LIST(no_method_found,Ordinal(INF.Precedence+1));
APPEND_LIST(no_method_found," choice method found for `");
APPEND_LIST(no_method_found,NAME_FUNC(INF.Operation));
APPEND_LIST(no_method_found,"' on ");
APPEND_LIST(no_method_found,STRING_INT(LENGTH(INF.Arguments)));
APPEND_LIST(no_method_found," arguments");
linebreak := true;
for argument_index in [ 1 .. LENGTH(INF.Arguments) ] do
if INF.Arguments[argument_index] = fail then
if linebreak then
APPEND_LIST(no_method_found, "\n");
linebreak := false;
fi;
APPEND_LIST(no_method_found, "The ");
APPEND_LIST(no_method_found, Ordinal(argument_index));
APPEND_LIST(no_method_found, " argument is 'fail' which might point to an earlier problem\n" );
fi;
od;
ErrorNoReturn(no_method_found);
end;
## This is the other part of the above mentioned dirty trick:
Unbind( ApplicableMethod );
#############################################################################
##
#F NONAVAILABLE_SHOW_FUNC( ) . . . . . . . . . . . . . . . . . . . . . . . .
##
## <ManSection>
## <Func Name="NONAVAILABLE_SHOW_FUNC" Arg=''/>
##
## <Description>
## This is an excuse if the user tries to call the <C>Show...</C> functions
## without a NoMethodFound-error.
## </Description>
## </ManSection>
##
BIND_GLOBAL( "NONAVAILABLE_SHOW_FUNC", function( arg )
Error( "this function is only available after a 'no method found'-Error" );
end );
# The following comes in handy also for command line completion:
BIND_GLOBAL( "ShowArguments", NONAVAILABLE_SHOW_FUNC );
BIND_GLOBAL( "ShowArgument", NONAVAILABLE_SHOW_FUNC );
BIND_GLOBAL( "ShowDetails", NONAVAILABLE_SHOW_FUNC );
BIND_GLOBAL( "ShowMethods", NONAVAILABLE_SHOW_FUNC );
BIND_GLOBAL( "ShowOtherMethods", NONAVAILABLE_SHOW_FUNC );
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2026-03-28
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