Commit | Line | Data |
afe60e53 |
1 | package XML::Tags; |
2 | |
3 | use strict; |
4 | use warnings FATAL => 'all'; |
5 | |
cb5717ef |
6 | use File::Glob (); |
7 | |
8 | |
9 | |
afe60e53 |
10 | my $IN_SCOPE = 0; |
11 | |
12 | sub import { |
13 | die "Can't import XML::Tags into a scope when already compiling one that uses it" |
14 | if $IN_SCOPE; |
15 | my ($class, @args) = @_; |
16 | my $opts = shift(@args) if ref($args[0]) eq 'HASH'; |
17 | my $target = $class->_find_target(0, $opts); |
18 | my @tags = $class->_find_tags(@args); |
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19 | $class->_setup_glob_override; |
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20 | my $unex = $class->_export_tags_into($target => @tags); |
21 | $class->_install_unexporter($unex); |
22 | $IN_SCOPE = 1; |
23 | } |
24 | |
25 | sub _find_tags { shift; @_ } |
26 | |
27 | sub _find_target { |
28 | my ($class, $extra_levels, $opts) = @_; |
29 | return $opts->{into} if defined($opts->{into}); |
30 | my $level = ($opts->{into_level} || 1) + $extra_levels; |
31 | return (caller($level))[0]; |
32 | } |
33 | |
34 | { |
35 | my $setup; |
36 | |
37 | sub _setup_glob_override { |
38 | return if $setup; |
39 | $setup = 1; |
40 | no warnings 'redefine'; |
41 | *CORE::GLOBAL::glob = sub { |
42 | for ($_[0]) { |
43 | # unless it smells like </foo> or <foo bar="baz"> |
cb5717ef |
44 | return File::Glob::glob($_[0]) unless (/^\/\w+$/ || /^\w+\s+\w+="/); |
afe60e53 |
45 | } |
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46 | return \('<'.$_[0].'>'); |
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47 | }; |
48 | } |
49 | } |
50 | |
51 | sub _export_tags_into { |
52 | my ($class, $into, @tags) = @_; |
53 | foreach my $tag (@tags) { |
54 | no strict 'refs'; |
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55 | tie *{"${into}::${tag}"}, 'XML::Tags::TIEHANDLE', \"<${tag}>"; |
afe60e53 |
56 | } |
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57 | return sub { |
58 | foreach my $tag (@tags) { |
59 | no strict 'refs'; |
60 | delete ${"${into}::"}{$tag} |
61 | } |
62 | $IN_SCOPE = 0; |
63 | }; |
64 | } |
65 | |
66 | sub _install_unexporter { |
67 | my ($class, $unex) = @_; |
68 | $^H |= 0x120000; # localize %^H |
69 | $^H{'XML::Tags::Unex'} = bless($unex, 'XML::Tags::Unex'); |
70 | } |
71 | |
72 | package XML::Tags::TIEHANDLE; |
73 | |
74 | sub TIEHANDLE { my $str = $_[1]; bless \$str, $_[0] } |
75 | sub READLINE { ${$_[0]} } |
76 | |
77 | package XML::Tags::Unex; |
78 | |
79 | sub DESTROY { local $@; eval { $_[0]->(); 1 } || warn "ARGH: $@" } |
80 | |
81 | 1; |