™.. XML::Handler::Subs - Online Linux Manual PageSection : 3
Updated : 2003-10-21
Source : perl v5.10.1
Note : User Contributed Perl Documentation
NAMEXML::Handler::Subs − a PerlSAX handler base class for calling user−defined subs
SYNOPSIS​ use XML::Handler::Subs; ​ ​ package MyHandlers; ​ use vars qw{ @ISA }; ​ ​ sub s_NAME { my ($self, $element) = @_ }; ​ sub e_NAME { my ($self, $element) = @_ }; ​ ​ $self−>{Names}; # an array of names ​ $self−>{Nodes}; # an array of $element nodes ​ ​ $handler = MyHandlers−>new(); ​ $self−>in_element($name); ​ $self−>within_element($name);
DESCRIPTION​\*(C`XML::Handler::Subs\*(C'\fR is a base class for PerlSAX handlers. ​\*(C`XML::Handler::Subs\*(C'\fR is subclassed to implement complete behavior and to add element-specific handling. Each time an element starts, a method by that name prefixed with `s_' is called with the element to be processed. Each time an element ends, a method with that name prefixed with `e_' is called. Any special characters in the element name are replaced by underscores. Subclassing XML::Handler::Subs in this way is similar to XML::Parser's Subs style. XML::Handler::Subs maintains a stack of element names, `\*(C`$self\-\*(C'\fR{Names}', and a stack of element nodes, `\f(CW\*(C`$self\-\*(C'\fR{Nodes}>' that can be used by subclasses. The current element is pushed on the stacks before calling an element-name start method and popped off the stacks after calling the element-name end method. The `\*(C`in_element()\*(C'\fR' and `\f(CW\*(C`within_element()\*(C'\fR' calls use these stacks. If the subclass implements `\*(C`start_document()\*(C'\fR', `\f(CW\*(C`end_document()\*(C'\fR', `\*(C`start_element()\*(C'\fR', and `\f(CW\*(C`end_element()\*(C'\fR', be sure to use `\*(C`SUPER::\*(C'\fR' to call the the superclass methods also. See \fIperlobj\fR\|(1) for details on SUPER::. `\*(C`SUPER::start_element()\*(C'\fR' and `\*(C`SUPER::end_element()\*(C'\fR' return 1 if an element-name method is called, they return 0 if no method was called. XML::Handler::Subs does not implement any other PerlSAX handlers. XML::Handler::Subs supports the following methods: new( OPTIONS ) A basic `\*(C`new()\*(C'\fR' method. `\f(CW\*(C`new()\*(C'\fR' takes a list of key, value pairs or a hash and creates and returns a hash with those options; the hash is blessed into the subclass. in_element($name) Returns true if `$name' is equal to the name of the innermost currently opened element. within_element($name) Returns the number of times the `$name' appears in Names.
AUTHORKen MacLeod, ken@bitsko.slc.ut.us
SEE ALSO​perl (1), PerlSAX.pod (3) 0
Johanes Gumabo
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