xref: /openbsd/usr.sbin/pkg_add/OpenBSD/Subst.pm (revision e5dd7070) 
1# ex:ts=8 sw=4:
2# $OpenBSD: Subst.pm,v 1.18 2019/07/05 06:02:29 espie Exp $
3#
4# Copyright (c) 2008 Marc Espie <espie@openbsd.org>
5#
6# Permission to use, copy, modify, and distribute this software for any
7# purpose with or without fee is hereby granted, provided that the above
8# copyright notice and this permission notice appear in all copies.
9#
10# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17
18use strict;
19use warnings;
20
21# very simple package, just holds everything needed for substitution
22# according to package rules.
23
24package OpenBSD::Subst;
25
26sub new
27{
28	bless {}, shift;
29}
30
31sub hash
32{
33	shift;
34}
35
36sub add
37{
38	my ($self, $k, $v) = @_;
39	$k =~ s/^\^//;
40	$self->{$k} = $v;
41}
42
43sub value
44{
45	my ($self, $k) = @_;
46	return $self->{$k};
47}
48
49sub parse_option
50{
51	my ($self, $opt) = @_;
52	if ($opt =~ m/^([^=]+)\=(.*)$/o) {
53		my ($k, $v) = ($1, $2);
54		$v =~ s/^\'(.*)\'$/$1/;
55		$v =~ s/^\"(.*)\"$/$1/;
56		$self->add($k, $v);
57	} else {
58		$self->add($opt, 1);
59	}
60}
61
62sub do
63{
64	my $self = shift;
65	my $s = shift;
66	return $s unless $s =~ m/\$/o;	# optimization
67	while ( my $k = ($s =~ m/\$\{([A-Za-z_][^\}]*)\}/o)[0] ) {
68		my $v = $self->{$k};
69		unless ( defined $v ) { $v = "\$\\\{$k\}"; }
70		$s =~ s/\$\{\Q$k\E\}/$v/g;
71	}
72	$s =~ s/\$\\\{([A-Za-z_])/\$\{$1/go;
73	return $s;
74}
75
76sub copy_fh2
77{
78	my ($self, $src, $dest) = @_;
79	my $contents = do { local $/; <$src> };
80	while (my ($k, $v) = each %{$self}) {
81		$contents =~ s/\$\{\Q$k\E\}/$v/g;
82	}
83	$contents =~ s/\$\\\{([A-Za-z_])/\$\{$1/go;
84	print $dest $contents;
85}
86
87sub copy_fh
88{
89	my ($self, $srcname, $dest) = @_;
90	open my $src, '<', $srcname or die "can't open $srcname: $!";
91	$self->copy_fh2($src, $dest);
92}
93
94sub copy
95{
96	my ($self, $srcname, $destname) = @_;
97	open my $dest, '>', $destname or die "can't open $destname: $!";
98	$self->copy_fh($srcname, $dest);
99	return $dest;
100}
101
102sub has_fragment
103{
104	my ($self, $def, $frag, $msg) = @_;
105
106	my $v = $self->value($def);
107
108	if (!defined $v) {
109		die "Error: unknown fragment $frag in $msg";
110	} elsif ($v == 1) {
111		return 1;
112	} elsif ($v == 0) {
113		return 0;
114	} else {
115		die "Incorrect define for $frag in $msg";
116	}
117}
118
119sub empty
120{
121	my ($self, $k) = @_;
122
123	my $v = $self->value($k);
124	if (defined $v && $v) {
125		return 0;
126	} else {
127		return 1;
128	}
129}
130
1311;
132