Commit | Line | Data |
---|---|---|
920dae64 AT |
1 | # $Id: Stream.pm,v 1.1 2003/07/27 16:07:49 matt Exp $ |
2 | ||
3 | package XML::Parser::Style::Stream; | |
4 | use strict; | |
5 | ||
6 | # This style invented by Tim Bray <tbray@textuality.com> | |
7 | ||
8 | sub Init { | |
9 | no strict 'refs'; | |
10 | my $expat = shift; | |
11 | $expat->{Text} = ''; | |
12 | my $sub = $expat->{Pkg} ."::StartDocument"; | |
13 | &$sub($expat) | |
14 | if defined(&$sub); | |
15 | } | |
16 | ||
17 | sub Start { | |
18 | no strict 'refs'; | |
19 | my $expat = shift; | |
20 | my $type = shift; | |
21 | ||
22 | doText($expat); | |
23 | $_ = "<$type"; | |
24 | ||
25 | %_ = @_; | |
26 | while (@_) { | |
27 | $_ .= ' ' . shift() . '="' . shift() . '"'; | |
28 | } | |
29 | $_ .= '>'; | |
30 | ||
31 | my $sub = $expat->{Pkg} . "::StartTag"; | |
32 | if (defined(&$sub)) { | |
33 | &$sub($expat, $type); | |
34 | } else { | |
35 | print; | |
36 | } | |
37 | } | |
38 | ||
39 | sub End { | |
40 | no strict 'refs'; | |
41 | my $expat = shift; | |
42 | my $type = shift; | |
43 | ||
44 | # Set right context for Text handler | |
45 | push(@{$expat->{Context}}, $type); | |
46 | doText($expat); | |
47 | pop(@{$expat->{Context}}); | |
48 | ||
49 | $_ = "</$type>"; | |
50 | ||
51 | my $sub = $expat->{Pkg} . "::EndTag"; | |
52 | if (defined(&$sub)) { | |
53 | &$sub($expat, $type); | |
54 | } else { | |
55 | print; | |
56 | } | |
57 | } | |
58 | ||
59 | sub Char { | |
60 | my $expat = shift; | |
61 | $expat->{Text} .= shift; | |
62 | } | |
63 | ||
64 | sub Proc { | |
65 | no strict 'refs'; | |
66 | my $expat = shift; | |
67 | my $target = shift; | |
68 | my $text = shift; | |
69 | ||
70 | doText($expat); | |
71 | ||
72 | $_ = "<?$target $text?>"; | |
73 | ||
74 | my $sub = $expat->{Pkg} . "::PI"; | |
75 | if (defined(&$sub)) { | |
76 | &$sub($expat, $target, $text); | |
77 | } else { | |
78 | print; | |
79 | } | |
80 | } | |
81 | ||
82 | sub Final { | |
83 | no strict 'refs'; | |
84 | my $expat = shift; | |
85 | my $sub = $expat->{Pkg} . "::EndDocument"; | |
86 | &$sub($expat) | |
87 | if defined(&$sub); | |
88 | } | |
89 | ||
90 | sub doText { | |
91 | no strict 'refs'; | |
92 | my $expat = shift; | |
93 | $_ = $expat->{Text}; | |
94 | ||
95 | if (length($_)) { | |
96 | my $sub = $expat->{Pkg} . "::Text"; | |
97 | if (defined(&$sub)) { | |
98 | &$sub($expat); | |
99 | } else { | |
100 | print; | |
101 | } | |
102 | ||
103 | $expat->{Text} = ''; | |
104 | } | |
105 | } | |
106 | ||
107 | 1; | |
108 | __END__ | |
109 | ||
110 | =head1 NAME | |
111 | ||
112 | XML::Parser::Style::Stream - Stream style for XML::Parser | |
113 | ||
114 | =head1 SYNOPSIS | |
115 | ||
116 | use XML::Parser; | |
117 | my $p = XML::Parser->new(Style => 'Stream', Pkg => 'MySubs'); | |
118 | $p->parsefile('foo.xml'); | |
119 | ||
120 | { | |
121 | package MySubs; | |
122 | ||
123 | sub StartTag { | |
124 | my ($e, $name) = @_; | |
125 | # do something with start tags | |
126 | } | |
127 | ||
128 | sub EndTag { | |
129 | my ($e, $name) = @_; | |
130 | # do something with end tags | |
131 | } | |
132 | ||
133 | sub Characters { | |
134 | my ($e, $data) = @_; | |
135 | # do something with text nodes | |
136 | } | |
137 | } | |
138 | ||
139 | =head1 DESCRIPTION | |
140 | ||
141 | This style uses the Pkg option to find subs in a given package to call for each event. | |
142 | If none of the subs that this | |
143 | style looks for is there, then the effect of parsing with this style is | |
144 | to print a canonical copy of the document without comments or declarations. | |
145 | All the subs receive as their 1st parameter the Expat instance for the | |
146 | document they're parsing. | |
147 | ||
148 | It looks for the following routines: | |
149 | ||
150 | =over 4 | |
151 | ||
152 | =item * StartDocument | |
153 | ||
154 | Called at the start of the parse . | |
155 | ||
156 | =item * StartTag | |
157 | ||
158 | Called for every start tag with a second parameter of the element type. The $_ | |
159 | variable will contain a copy of the tag and the %_ variable will contain | |
160 | attribute values supplied for that element. | |
161 | ||
162 | =item * EndTag | |
163 | ||
164 | Called for every end tag with a second parameter of the element type. The $_ | |
165 | variable will contain a copy of the end tag. | |
166 | ||
167 | =item * Text | |
168 | ||
169 | Called just before start or end tags with accumulated non-markup text in | |
170 | the $_ variable. | |
171 | ||
172 | =item * PI | |
173 | ||
174 | Called for processing instructions. The $_ variable will contain a copy of | |
175 | the PI and the target and data are sent as 2nd and 3rd parameters | |
176 | respectively. | |
177 | ||
178 | =item * EndDocument | |
179 | ||
180 | Called at conclusion of the parse. | |
181 | ||
182 | =back | |
183 | ||
184 | =cut |