1XML::Handler::Subs(3) User Contributed Perl DocumentationXML::Handler::Subs(3)
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NAME

6       XML::Handler::Subs - a PerlSAX handler base class for calling
7       user-defined subs
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SYNOPSIS

10        use XML::Handler::Subs;
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12        package MyHandlers;
13        use vars qw{ @ISA };
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15        sub s_NAME { my ($self, $element) = @_ };
16        sub e_NAME { my ($self, $element) = @_ };
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18        $self->{Names};    # an array of names
19        $self->{Nodes};    # an array of $element nodes
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21        $handler = MyHandlers->new();
22        $self->in_element($name);
23        $self->within_element($name);
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DESCRIPTION

26       "XML::Handler::Subs" is a base class for PerlSAX handlers.
27       "XML::Handler::Subs" is subclassed to implement complete behavior and
28       to add element-specific handling.
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30       Each time an element starts, a method by that name prefixed with `s_'
31       is called with the element to be processed.  Each time an element ends,
32       a method with that name prefixed with `e_' is called.  Any special
33       characters in the element name are replaced by underscores.
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35       Subclassing XML::Handler::Subs in this way is similar to XML::Parser's
36       Subs style.
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38       XML::Handler::Subs maintains a stack of element names,
39       `"$self-"{Names}', and a stack of element nodes, `"$self-"{Nodes}>'
40       that can be used by subclasses.  The current element is pushed on the
41       stacks before calling an element-name start method and popped off the
42       stacks after calling the element-name end method.  The `"in_element()"'
43       and `"within_element()"' calls use these stacks.
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45       If the subclass implements `"start_document()"', `"end_document()"',
46       `"start_element()"', and `"end_element()"', be sure to use `"SUPER::"'
47       to call the the superclass methods also.  See perlobj(1) for details on
48       SUPER::.  `"SUPER::start_element()"' and `"SUPER::end_element()"'
49       return 1 if an element-name method is called, they return 0 if no
50       method was called.
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52       XML::Handler::Subs does not implement any other PerlSAX handlers.
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54       XML::Handler::Subs supports the following methods:
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56       new( OPTIONS )
57           A basic `"new()"' method.  `"new()"' takes a list of key, value
58           pairs or a hash and creates and returns a hash with those options;
59           the hash is blessed into the subclass.
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61       in_element($name)
62           Returns true if `$name' is equal to the name of the innermost
63           currently opened element.
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65       within_element($name)
66           Returns the number of times the `$name' appears in Names.
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AUTHOR

69       Ken MacLeod, ken@bitsko.slc.ut.us
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SEE ALSO

72       perl(1), PerlSAX.pod(3)
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76perl v5.28.1                      2003-10-21             XML::Handler::Subs(3)
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