1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
|
#
# CharEnts.pm
#
# $Id: CharEnts.pm,v 1.1.1.1 2001/05/24 15:57:41 sano Exp $
#
# SGML Character Entity utilities -- interface to Perl module
# Text::EntityMap.
#
package LinuxDocTools::CharEnts;
use strict;
=head1 NAME
LinuxDocTools::CharEnts - Interface to Text::EntityMap
=head1 SYNOPSIS
my $char_maps = load_char_maps ('.2ext', [ Text::EntityMap::sdata_dirs() ]);
$value = parse_data ($value, $char_maps, $escape_sub);
=head1 DESCRIPTION
This module provides a simple interface to the entity map handling provided by
B<Text::EntityMap>.
=head1 FUNCTIONS
=over 4
=cut
use Text::EntityMap;
use Exporter;
use vars qw(@ISA @EXPORT $VERSION);
@ISA = qw(Exporter);
@EXPORT = qw(load_char_maps parse_data);
$VERSION = sprintf("%d.%02d", q$Revision: 1.1.1.1 $ =~ /(\d+)\.(\d+)/);
# `%warn_map' tracks entities that were not able to be mapped so they
# are only warned once.
my %warn_map = ();
=item parse_data ($data, $char_map, $escape_sub)
B<parse_data> takes a string of I<$data> in the output format of
B<nsgmls> (see SP's C<sgmlsout.htm> document) without the leading dash.
B<parse_data> calls I<$char_map>'s lookup method for each sdata
entity reference. If the entity reference is undefined, it is
left alone (without the (n)sgmls C<\|>). For all remaining data,
B<parse_data> calls back into I<$escape_sub> to properly escape
characters for the backend formatter. Strings returned from the
lookup method are assumed to be already escaped.
This routine is derived from David Megginson's SGMLSpm.
=cut
sub parse_data {
my ($data, $char_map, $escape_sub) = @_;
my ($result) = "";
my $sdata_flag = 0;
my $out = '';
while ($data =~ /\\(\\|n|\||[0-7]{1,3})/) {
$out .= $`;
$data = $';
if ($1 eq '|') {
# beginning or end of SDATA
if ("$out" ne '') {
if ($sdata_flag) {
my ($mapping) = $char_map->lookup ($out);
if (defined $mapping) {
# escape `\' in mapping for ASP
$mapping =~ s/\\/\\\\/g;
$result .= $mapping;
} else {
if (!$warn_map{$out}) {
warn "parse_data: no entity map for \`$out'\n";
$warn_map{$out} = 1;
}
# output the entity reference inside of `{}'
$result .= &$escape_sub ("{" . $out . "}");
}
} else {
$result .= &$escape_sub ($out);
}
$out = '';
}
$sdata_flag = !$sdata_flag;
} elsif ($1 eq 'n') {
# record end
# pass '\\n' through to ASP
$result .= &$escape_sub ($out) . '\\n';
$out = '';
} elsif ($1 eq '\\') {
# backslash
$result .= &$escape_sub ($out);
$out = '[bsol ]'; # bsol == entity name for backslash
my ($mapping) = $char_map->lookup ($out);
if (defined $mapping) {
# escape `\' in mapping for ASP
$mapping =~ s/\\/\\\\/g;
$result .= $mapping;
} else {
if (!$warn_map{$out}) {
warn "parse_data: no entity map for \`$out'\n";
$warn_map{$out} = 1;
}
# output the entity reference inside of `{}'
$result .= &$escape_sub ("{" . $out . "}");
}
$out = '';
} else {
# other octal character
$result .= &$escape_sub ($out . chr(oct($1)));
$out = '';
}
}
$out .= $data;
if ("$out" ne '') {
$result .= &$escape_sub ($out);
}
return ($result);
}
=item load_char_maps ($format, $paths)
B<load_char_maps> takes an EntityMap format suffix and loads all of the
character entity replacement sets for that suffix into an EntityMapGroup.
It searches every directory in I<@{$path}>.
=cut
sub load_char_maps {
my ($format, $paths) = @_;
my (@char_maps) = ();
my ($path, $file_name, $char_map);
foreach $path (@{$paths}) {
if (-d $path) {
opendir (SDATADIR, $path)
|| die "load_char_map: opening directory \`$path' for reading: $!\n";
foreach $file_name (readdir (SDATADIR)) {
next if ($file_name !~ /$format$/);
eval {$char_map = Text::EntityMap->load ("$path/$file_name")}
|| die "load_char_map: loading \`$path/$file_name'\n$@\n";
push (@char_maps, $char_map);
}
closedir (SDATADIR);
}
}
warn "load_char_maps: no entity maps found\n"
if ($#char_maps == -1);
return (Text::EntityMap->group (@char_maps));
}
=back
=head1 AUTHOR
Ken MacLeod, C<E<lt>ken@bitsko.slc.ut.usE<gt>>
=cut
1;
|
