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124 .\" ========================================================================
127 .TH SAX 3 "2008-08-05" "perl v5.8.7" "User Contributed Perl Documentation"
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129 .\" way too many mistakes in technical documents.
133 XML::SAX \- Simple API for XML
135 .IX Header "SYNOPSIS"
139 \& # get a list of known parsers
140 \& my $parsers = XML::SAX\->parsers();
142 \& # add/update a parser
143 \& XML::SAX\->add_parser(q(XML::SAX::PurePerl));
146 \& XML::SAX\->remove_parser(q(XML::SAX::Foodelberry));
149 \& XML::SAX\->save_parsers();
152 .IX Header "DESCRIPTION"
153 \&\s-1XML::SAX\s0 is a \s-1SAX\s0 parser access \s-1API\s0 for Perl. It includes classes
154 and APIs required for implementing \s-1SAX\s0 drivers, along with a factory
155 class for returning any \s-1SAX\s0 parser installed on the user's system.
156 .SH "USING A SAX2 PARSER"
157 .IX Header "USING A SAX2 PARSER"
158 The factory class is XML::SAX::ParserFactory. Please see the
159 documentation of that module for how to instantiate a \s-1SAX\s0 parser:
160 XML::SAX::ParserFactory. However if you don't want to load up
161 another manual page, here's a short synopsis:
164 \& use XML::SAX::ParserFactory;
165 \& use XML::SAX::XYZHandler;
166 \& my $handler = XML::SAX::XYZHandler\->new();
167 \& my $p = XML::SAX::ParserFactory\->parser(Handler => $handler);
168 \& $p\->parse_uri("foo.xml");
169 \& # or $p\->parse_string("<foo/>") or $p\->parse_file($fh);
172 This will automatically load a \s-1SAX2\s0 parser (defaulting to
173 XML::SAX::PurePerl if no others are found) and return it to you.
175 In order to learn how to use \s-1SAX\s0 to parse \s-1XML\s0, you will need to read
176 XML::SAX::Intro and for reference, XML::SAX::Specification.
177 .SH "WRITING A SAX2 PARSER"
178 .IX Header "WRITING A SAX2 PARSER"
179 The first thing to remember in writing a \s-1SAX2\s0 parser is to subclass
180 XML::SAX::Base. This will make your life infinitely easier, by providing
181 a number of methods automagically for you. See XML::SAX::Base for more
184 When writing a \s-1SAX2\s0 parser that is compatible with \s-1XML::SAX\s0, you need
185 to inform \s-1XML::SAX\s0 of the presence of that driver when you install it.
186 In order to do that, \s-1XML::SAX\s0 contains methods for saving the fact that
187 the parser exists on your system to a \*(L"\s-1INI\s0\*(R" file, which is then loaded
188 to determine which parsers are installed.
190 The best way to do this is to follow these rules:
192 Add \s-1XML::SAX\s0 as a prerequisite in Makefile.PL:
197 \& PREREQ_PM => { \*(AqXML::SAX\*(Aq => 0 },
202 Alternatively you may wish to check for it in other ways that will
203 cause more than just a warning.
205 Add the following code snippet to your Makefile.PL:
210 \& my $script = shift\->SUPER::install(@_);
211 \& if (ExtUtils::MakeMaker::prompt(
212 \& "Do you want to modify ParserDetails.ini?", \*(AqY\*(Aq)
214 \& $script =~ s/install :: (.*)$/install :: $1 install_sax_driver/m;
215 \& $script .= <<"INSTALL";
217 \& install_sax_driver :
218 \& \et\e@\e$(PERL) \-MXML::SAX \-e "XML::SAX\->add_parser(q(\e$(NAME)))\->save_parsers()"
226 Note that you should check the output of this \- \e$(\s-1NAME\s0) will use the name of
227 your distribution, which may not be exactly what you want. For example XML::LibXML
228 has a driver called XML::LibXML::SAX::Generator, which is used in place of
229 \&\e$(\s-1NAME\s0) in the above.
231 Add an \s-1XML::SAX\s0 test:
233 A test file should be added to your t/ directory containing something like the
238 \& BEGIN { plan tests => 3 }
240 \& use XML::SAX::PurePerl::DebugHandler;
241 \& XML::SAX\->add_parser(q(XML::SAX::MyDriver));
242 \& local $XML::SAX::ParserPackage = \*(AqXML::SAX::MyDriver\*(Aq;
244 \& my $handler = XML::SAX::PurePerl::DebugHandler\->new();
246 \& my $parser = XML::SAX::ParserFactory\->parser(Handler => $handler);
248 \& ok($parser\->isa(\*(AqXML::SAX::MyDriver\*(Aq);
249 \& $parser\->parse_string("<tag/>");
250 \& ok($handler\->{seen}{start_element});
255 By default, \s-1XML::SAX\s0 exports nothing into the caller's namespace. However you
256 can request the symbols \f(CW\*(C`Namespaces\*(C'\fR and \f(CW\*(C`Validation\*(C'\fR which are the
257 URIs for those features, allowing an easier way to request those features
261 \& use XML::SAX qw(Namespaces Validation);
262 \& my $factory = XML::SAX::ParserFactory\->new();
263 \& $factory\->require_feature(Namespaces);
264 \& $factory\->require_feature(Validation);
265 \& my $parser = $factory\->parser();
269 Current maintainer: Grant McLean, grantm@cpan.org
271 Originally written by:
273 Matt Sergeant, matt@sergeant.org
275 Kip Hampton, khampton@totalcinema.com
277 Robin Berjon, robin@knowscape.com
280 This is free software, you may use it and distribute it under
281 the same terms as Perl itself.
283 .IX Header "SEE ALSO"
284 XML::SAX::Base for writing \s-1SAX\s0 Filters and Parsers
286 XML::SAX::PurePerl for an \s-1XML\s0 parser written in 100%
289 XML::SAX::Exception for details on exception handling