XML::Grove::Subst(3pm)

1XML::Grove::Subst(3)  User Contributed Perl Documentation XML::Grove::Subst(3)
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NAME

6       XML::Grove::Subst - substitute values into a template
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SYNOPSIS

9        use XML::Grove::Subst;
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11        # Using subst method on XML::Grove::Document or XML::Grove::Element:
12        $new_grove = $source_grove->subst( ARGS );
13        $new_grove = $source_grove->subst_hash( ARG );
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15        # Using an XML::Grove::Subst instance:
16        $subster = XML::Grove::Subst->new();
17        $new_grove = $subster->subst( $source_grove, ARGS );
18        $new_grove = $subster->subst_hash( $source_grove, ARG );
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DESCRIPTION

21       "XML::Grove::Subst" implements XML templates.  "XML::Grove::Subst"
22       traverses through a source grove replacing all elements with names
23       `"SUB:XXX"' or `"SUB:key"' with their corresponding values from ARGS (a
24       list) or ARG (a hash), repsectively.
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METHODS

27       $grove_obj->subst( ARGS ) =item $subster->subst( $grove_obj, ARGS )
28           Search for `"SUB:XXX"' elements, where XXX is an array index, and
29           replace the element with the value from ARGS, a list of values.
30           The return value is a new grove with the substitutions applied.
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32       $grove_obj->subst_hash( ARG ) =item $subster->subst_hash( $grove_obj,
33       ARG )
34           Search for `"SUB:key"' elements and replace the element with the
35           value from ARG, a hash of values.  The hash key is taken from the
36           `"key"' attribute of the `"SUB:key"' element, for example,
37           `"<SUB:key key='foo'>"'.  The return value is a new grove with the
38           substitutions applied.
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EXAMPLE

41       The following template, in a file `"template.xml"', could be used for a
42       simple parts database conversion to HTML:
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44           <html>
45             <head>
46               <title><SUB:key key='Name'></title>
47             </head>
48             <body>
49               <h1><SUB:key key='Name'></title>
50               <p>Information for part number <SUB:key key='Number'>:</p>
51               <SUB:key key='Description'>
52             </body>
53           </html>
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55       To use this template you would first parse it and convert it to a
56       grove, and then use `"subst_hash()"' every time you needed a new page:
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58           use XML::Parser::PerlSAX;
59           use XML::Grove;
60           use XML::Grove::Builder;
61           use XML::Grove::Subst;
62           use XML::Grove::PerlSAX;
63           use XML::Handler::XMLWriter;
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65           # Load the template
66           $b = XML::Grove::Builder->new();
67           $p = XML::Parser::PerlSAX->new( Handler = $b );
68           $source_grove = $p->parse( Source => { SystemId => 'template.xml' } );
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70           # Apply the substitutions
71           $new_grove = $source_grove->subst_hash( { Name => 'Acme DCX-2000 Filter',
72                                                     Number => 'N4728',
73                                                     Description => 'The Best' } );
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75           # Write the new grove to standard output
76           $w = XML::Handler::XMLWriter->new();
77           $wp = XML::Grove::PerlSAX->new( Handler => $w );
78           $wp->parse( Source => { Grove => $new_grove } );
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AUTHOR

81       Ken MacLeod, ken@bitsko.slc.ut.us
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POD ERRORS

89       Hey! The above document had some coding errors, which are explained
90       below:
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92       Around line 173:
93           You forgot a '=back' before '=head1'
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97perl v5.34.0                      2021-07-23              XML::Grove::Subst(3)