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# Copyright (C) 2018 Matthias Paulmier
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
package Automake::VarAppend;
use strict;
use 5.006;
use Automake::Channels;
use Automake::Condition qw (TRUE FALSE);
use Automake::Item;
use Automake::VarDef;
use Exporter;
use vars '@ISA', '@EXPORT';
@ISA = qw (Automake::Item Exporter);
@EXPORT = qw (append_var_cur_cond first_assign_var am_check_definitions);
=head1 NAME
Automake::VarAppend - Helper methods for appending to variables
=head1 DESCRIPTION
This package provides methods for appending values to variables.
It is used by the C<Automake::Variable> class in its C<define> function.
=head2 Functions
=item C<append_var_cur_cond ($self, $var, $owner, $where, $def, $value,
$comment)>
Append $value to an existing $var defined for the current condition. This is
only used in the define method of this file.
=cut
sub append_var_cur_cond ($$$$$$$)
{
my ($self, $var, $owner, $where, $def, $value, $comment) = @_;
$def->append ($value, $comment);
$self->{'last-append'} = [];
# Only increase owners. A VAR_CONFIGURE variable augmented in a
# Makefile.am becomes a VAR_MAKEFILE variable.
$def->set_owner ($owner, $where->clone)
if $owner > $def->owner;
}
=item C<first_assign_var ($sefl, $var, $cond, $owner, $where, $def, $value, $pretty, $comment, $new_var, $type)>
Method that assign a value to a variable for the first time or for total
redefinition of an Automake variable or an AC_SUBST variable for an existing
condition.
=cut
sub first_assign_var ($$$$$$$$$$$)
{
my ($self, $var, $cond, $owner, $where, $def, $value, $pretty, $comment, $new_var, $type) = @_;
# Never decrease an owner.
$owner = $def->owner
if ! $new_var && $owner < $def->owner;
# Assignments to a macro set its location. We don't adjust
# locations for '+='. Ideally I suppose we would associate
# line numbers with random bits of text.
$def = new Automake::VarDef ($var, $value, $comment, $where->clone,
$type, $owner, $pretty);
$self->set ($cond, $def);
}
=item am_check_definitions ($var, $cond, $def, $type, $where)
Additional checks for Automake definitions
=cut
sub am_check_definitions ($$$$$)
{
my ($var, $cond, $def, $type, $where) = @_;
# An Automake variable must be consistently defined with the same
# sign by Automake.
if ($def->type ne $type && $def->owner == VAR_AUTOMAKE)
{
error ($def->location,
"Automake variable '$var' was set with '"
. $def->type . "=' here ...", partial => 1);
error ($where, "... and is now set with '$type=' here.");
prog_error ("Automake variable assignments should be consistently\n"
. "defined with the same sign");
}
}
=back
=head1 SEE ALSO
L<Automake::VarDef>, L<Automake::Variable>,
L<Automake::Condition>, L<Automake::Item>,
L<Automake::Channels>.
=cut
1;
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