1XML::TreePP(3) User Contributed Perl Documentation XML::TreePP(3)
2
6 XML::TreePP -- Pure Perl implementation for parsing/writing XML
7 documents
8
10 parse an XML document from file into hash tree:
11 use XML::TreePP;
13 my $tpp = XML::TreePP->new();
14 my $tree = $tpp->parsefile( "index.rdf" );
15 print "Title: ", $tree->{"rdf:RDF"}->{item}->[0]->{title}, "\n";
16 print "URL: ", $tree->{"rdf:RDF"}->{item}->[0]->{link}, "\n";
17 write an XML document as string from hash tree:
19 use XML::TreePP;
21 my $tpp = XML::TreePP->new();
22 my $tree = { rss => { channel => { item => [ {
23 title => "The Perl Directory",
24 link => "http://www.perl.org/",
25 }, {
26 title => "The Comprehensive Perl Archive Network",
27 link => "http://cpan.perl.org/",
28 } ] } } };
29 my $xml = $tpp->write( $tree );
30 print $xml;
31 get a remote XML document by HTTP-GET and parse it into hash tree:
33 use XML::TreePP;
35 my $tpp = XML::TreePP->new();
36 my $tree = $tpp->parsehttp( GET => "http://use.perl.org/index.rss" );
37 print "Title: ", $tree->{"rdf:RDF"}->{channel}->{title}, "\n";
38 print "URL: ", $tree->{"rdf:RDF"}->{channel}->{link}, "\n";
39 get a remote XML document by HTTP-POST and parse it into hash tree:
41 use XML::TreePP;
43 my $tpp = XML::TreePP->new( force_array => [qw( item )] );
44 my $cgiurl = "http://search.hatena.ne.jp/keyword";
45 my $keyword = "ajax";
46 my $cgiquery = "mode=rss2&word=".$keyword;
47 my $tree = $tpp->parsehttp( POST => $cgiurl, $cgiquery );
48 print "Link: ", $tree->{rss}->{channel}->{item}->[0]->{link}, "\n";
49 print "Desc: ", $tree->{rss}->{channel}->{item}->[0]->{description}, "\n";
50
52 XML::TreePP module parses an XML document and expands it for a hash
53 tree. This generates an XML document from a hash tree as the opposite
54 way around. This is a pure Perl implementation and requires no modules
55 depended. This can also fetch and parse an XML document from remote
56 web server like the XMLHttpRequest object does at JavaScript language.
57
59 Parse XML file
60 Sample XML document:
61 <?xml version="1.0" encoding="UTF-8"?>
63 <family name="Kawasaki">
64 <father>Yasuhisa</father>
65 <mother>Chizuko</mother>
66 <children>
67 <girl>Shiori</girl>
68 <boy>Yusuke</boy>
69 <boy>Kairi</boy>
70 </children>
71 </family>
72 Sample program to read a xml file and dump it:
74 use XML::TreePP;
76 use Data::Dumper;
77 my $tpp = XML::TreePP->new();
78 my $tree = $tpp->parsefile( "family.xml" );
79 my $text = Dumper( $tree );
80 print $text;
81 Result dumped:
83 $VAR1 = {
85 'family' => {
86 '-name' => 'Kawasaki',
87 'father' => 'Yasuhisa',
88 'mother' => 'Chizuko',
89 'children' => {
90 'girl' => 'Shiori'
91 'boy' => [
92 'Yusuke',
93 'Kairi'
94 ],
95 }
96 }
97 };
98 Details:
100 print $tree->{family}->{father}; # the father's given name.
102 The prefix '-' is added on every attribute's name.
104 print $tree->{family}->{"-name"}; # the family name of the family
106 The array is used because the family has two boys.
108 print $tree->{family}->{children}->{boy}->[1]; # The second boy's name
110 print $tree->{family}->{children}->{girl}; # The girl's name
111 Text node and attributes:
113 If a element has both of a text node and attributes or both of a text
114 node and other child nodes, value of a text node is moved to "#text"
115 like child nodes.
116 use XML::TreePP;
118 use Data::Dumper;
119 my $tpp = XML::TreePP->new();
120 my $source = '<span class="author">Kawasaki Yusuke</span>';
121 my $tree = $tpp->parse( $source );
122 my $text = Dumper( $tree );
123 print $text;
124 The result dumped is following:
126 $VAR1 = {
128 'span' => {
129 '-class' => 'author',
130 '#text' => 'Kawasaki Yusuke'
131 }
132 };
133 The special node name of "#text" is used because this elements has
135 attribute(s) in addition to the text node. See also "text_node_key"
136 option.
137
139 new
140 This constructor method returns a new XML::TreePP object with %options.
141 $tpp = XML::TreePP->new( %options );
143 set
145 This method sets a option value for "option_name". If $option_value is
146 not defined, its option is deleted.
147 $tpp->set( option_name => $option_value );
149 See OPTIONS section below for details.
151 get
153 This method returns a current option value for "option_name".
154 $tpp->get( 'option_name' );
156 parse
158 This method reads an XML document by string and returns a hash tree
159 converted. The first argument is a scalar or a reference to a scalar.
160 $tree = $tpp->parse( $source );
162 parsefile
164 This method reads an XML document by file and returns a hash tree
165 converted. The first argument is a filename.
166 $tree = $tpp->parsefile( $file );
168 parsehttp
170 This method receives an XML document from a remote server via HTTP and
171 returns a hash tree converted.
172 $tree = $tpp->parsehttp( $method, $url, $body, $head );
174 $method is a method of HTTP connection: GET/POST/PUT/DELETE $url is an
176 URI of an XML file. $body is a request body when you use POST method.
177 $head is a request headers as a hash ref. LWP::UserAgent module or
178 HTTP::Lite module is required to fetch a file.
179 ( $tree, $xml, $code ) = $tpp->parsehttp( $method, $url, $body, $head );
181 In array context, This method returns also raw XML document received
183 and HTTP response's status code.
184 write
186 This method parses a hash tree and returns an XML document as a string.
187 $source = $tpp->write( $tree, $encode );
189 $tree is a reference to a hash tree.
191 writefile
193 This method parses a hash tree and writes an XML document into a file.
194 $tpp->writefile( $file, $tree, $encode );
196 $file is a filename to create. $tree is a reference to a hash tree.
198
200 This module accepts option parameters following:
201 force_array
203 This option allows you to specify a list of element names which should
204 always be forced into an array representation.
205 $tpp->set( force_array => [ 'rdf:li', 'item', '-xmlns' ] );
207 The default value is null, it means that context of the elements will
209 determine to make array or to keep it scalar or hash. Note that the
210 special wildcard name '*' means all elements.
211 force_hash
213 This option allows you to specify a list of element names which should
214 always be forced into an hash representation.
215 $tpp->set( force_hash => [ 'item', 'image' ] );
217 The default value is null, it means that context of the elements will
219 determine to make hash or to keep it scalar as a text node. See also
220 "text_node_key" option below. Note that the special wildcard name '*'
221 means all elements.
222 cdata_scalar_ref
224 This option allows you to convert a cdata section into a reference for
225 scalar on parsing an XML document.
226 $tpp->set( cdata_scalar_ref => 1 );
228 The default value is false, it means that each cdata section is
230 converted into a scalar.
231 user_agent
233 This option allows you to specify a HTTP_USER_AGENT string which is
234 used by parsehttp() method.
235 $tpp->set( user_agent => 'Mozilla/4.0 (compatible; ...)' );
237 The default string is 'XML-TreePP/#.##', where '#.##' is substituted
239 with the version number of this library.
240 http_lite
242 This option forces pasrsehttp() method to use a HTTP::Lite instance.
243 my $http = HTTP::Lite->new();
245 $tpp->set( http_lite => $http );
246 lwp_useragent
248 This option forces pasrsehttp() method to use a LWP::UserAgent
249 instance.
250 my $ua = LWP::UserAgent->new();
252 $ua->timeout( 60 );
253 $ua->env_proxy;
254 $tpp->set( lwp_useragent => $ua );
255 You may use this with LWP::UserAgent::WithCache.
257 base_class
259 This blesses class name for each element's hashref. Each class is
260 named straight as a child class of it parent class.
261 $tpp->set( base_class => 'MyElement' );
263 my $xml = '<root><parent><child key="val">text</child></parent></root>';
264 my $tree = $tpp->parse( $xml );
265 print ref $tree->{root}->{parent}->{child}, "\n";
266 A hash for <child> element above is blessed to
268 "MyElement::root::parent::child" class. You may use this with
269 Class::Accessor.
270 elem_class
272 This blesses class name for each element's hashref. Each class is
273 named horizontally under the direct child of "MyElement".
274 $tpp->set( base_class => 'MyElement' );
276 my $xml = '<root><parent><child key="val">text</child></parent></root>';
277 my $tree = $tpp->parse( $xml );
278 print ref $tree->{root}->{parent}->{child}, "\n";
279 A hash for <child> element above is blessed to "MyElement::child"
281 class.
282 xml_deref
284 This option dereferences the numeric character references, like ë,
285 漢, etc., in an XML document when this value is true.
286 $tpp->set( xml_deref => 1 );
288 Note that, for security reasons and your convenient, this module
290 dereferences the predefined character entity references, &, <,
291 >, ' and ", and the numeric character references up to
292 U+007F without xml_deref per default.
293
295 first_out
296 This option allows you to specify a list of element/attribute names
297 which should always appears at first on output XML document.
298 $tpp->set( first_out => [ 'link', 'title', '-type' ] );
300 The default value is null, it means alphabetical order is used.
302 last_out
304 This option allows you to specify a list of element/attribute names
305 which should always appears at last on output XML document.
306 $tpp->set( last_out => [ 'items', 'item', 'entry' ] );
308 indent
310 This makes the output more human readable by indenting appropriately.
311 $tpp->set( indent => 2 );
313 This doesn't strictly follow the XML specification but does looks nice.
315 xml_decl
317 This module inserts an XML declaration on top of the XML document
318 generated per default. This option forces to change it to another or
319 just remove it.
320 $tpp->set( xml_decl => '' );
322 output_encoding
324 This option allows you to specify a encoding of the XML document
325 generated by write/writefile methods.
326 $tpp->set( output_encoding => 'UTF-8' );
328 On Perl 5.8.0 and later, you can select it from every encodings
330 supported by Encode.pm. On Perl 5.6.x and before with Jcode.pm, you can
331 use "Shift_JIS", "EUC-JP", "ISO-2022-JP" and "UTF-8". The default value
332 is "UTF-8" which is recommended encoding.
333
335 utf8_flag
336 This makes utf8 flag on for every element's value parsed and makes it
337 on for the XML document generated as well.
338 $tpp->set( utf8_flag => 1 );
340 Perl 5.8.1 or later is required to use this.
342 attr_prefix
344 This option allows you to specify a prefix character(s) which is
345 inserted before each attribute names.
346 $tpp->set( attr_prefix => '@' );
348 The default character is '-'. Or set '@' to access attribute values
350 like E4X, ECMAScript for XML. Zero-length prefix '' is available as
351 well, it means no prefix is added.
352 text_node_key
354 This option allows you to specify a hash key for text nodes.
355 $tpp->set( text_node_key => '#text' );
357 The default key is "#text".
359 ignore_error
361 This module calls Carp::croak function on an error per default. This
362 option makes all errors ignored and just returns.
363 $tpp->set( ignore_error => 1 );
365 use_ixhash
367 This option keeps the order for each element appeared in XML.
368 Tie::IxHash module is required.
369 $tpp->set( use_ixhash => 1 );
371 This makes parsing performance slow. (about 100% slower than default)
373
375 Yusuke Kawasaki, http://www.kawa.net/
376
378 Copyright (c) 2006-2009 Yusuke Kawasaki. All rights reserved. This
379 program is free software; you can redistribute it and/or modify it
380 under the same terms as Perl itself.
381perl v5.12.1 2009-06-30 XML::TreePP(3)