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# ex:ts=8 sw=4:
# $OpenBSD: Subst.pm,v 1.5 2008/04/07 17:56:43 espie Exp $
#
# Copyright (c) 2008 Marc Espie <espie@openbsd.org>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
use strict;
use warnings;
# very simple package, just holds everything needed for substitution
# according to package rules.
package OpenBSD::Subst;
sub new
{
bless {}, shift;
}
sub hash
{
shift;
}
sub add
{
my ($self, $k, $v) = @_;
$k =~ s/^\^//;
$self->{$k} = $v;
}
sub value
{
my ($self, $k) = @_;
return $self->{$k};
}
sub parse_option
{
my ($self, $opt) = @_;
if ($opt =~ m/^([^=]+)\=(.*)$/o) {
my ($k, $v) = ($1, $2);
$v =~ s/^\'(.*)\'$/$1/;
$v =~ s/^\"(.*)\"$/$1/;
$self->add($k, $v);
} else {
$self->add($opt, 1);
}
}
sub do
{
my $self = shift;
local $_ = shift;
return $_ unless m/\$/o; # optimization
while (my ($k, $v) = each %{$self->hash}) {
s/\$\{\Q$k\E\}/$v/g;
}
s/\$\\/\$/go;
return $_;
}
sub copy_fh
{
my ($self, $srcname, $dest) = @_;
open my $src, '<', $srcname or die "can't open $srcname";
local $_;
while (<$src>) {
print $dest $self->do($_);
}
}
sub copy
{
my ($self, $srcname, $destname) = @_;
open my $dest, '>', $destname or die "can't open $destname";
$self->copy_fh($srcname, $dest);
}
sub has_fragment
{
my ($self, $def, $frag) = @_;
my $v = $self->value($def);
if (!defined $v) {
die "Error: unknown fragment $frag";
} elsif ($v == 1) {
return 1;
} elsif ($v == 0) {
return 0;
} else {
die "Incorrect define for $frag";
}
}
sub empty
{
my ($self, $k) = @_;
my $v = $self->value($k);
if (defined $v && $v) {
return 0;
} else {
return 1;
}
}
1;
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