12-31-2016
In this forum have been lot of questions parse xml using awk.
I have published
some solution in one location. Sort toolset to parse xml using awk. Basic idea is to change xml more for awk friendly format.
Enjoy.
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LEARN ABOUT DEBIAN
xml::sax::pipeline
XML::SAX::Pipeline(3pm) User Contributed Perl Documentation XML::SAX::Pipeline(3pm)
NAME
XML::SAX::Pipeline - Manage a linear pipeline of SAX processors
SYNOPSIS
use XML::SAX::Machines qw( Pipeline ); ## Most common way
use XML::Fitler::Foo;
my $m = Pipeline(
XML::Filter::Foo->new, ## Create it manually
"XML::Filter::Bar", ## Or let Pipeline load & create it
"XML::Filter::Baz",
{
## Normal options
Handler => $h,
}
);
## To choose the default parser automatically if XML::Filter::Foo
## does not implement a parse_file method, just pretend the Pipeline
## is a parser:
$m->parse_file( "blah" );
## To feed the pipeline from an upstream processor, treat it like
## any other SAX filter:
my $p = Some::SAX::Generator->new( Handler => $m );
## To read a file or the output from a subprocess:
my $m = Pipeline( "<infile.txt" );
my $m = Pipeline( "spew_xml |" );
## To send output to a file handle, file, or process:
my $m = Pipeline( ..., *STDOUT );
my $m = Pipeline( ..., ">outfile.txt" );
my $m = Pipeline( ..., "| xmllint --format -" );
DESCRIPTION
An XML::SAX::Pipeline is a linear sequence SAX processors. Events passed to the pipeline are received by the "Intake" end of the pipeline
and the last filter to process events in the pipeline passes the events out the "Exhaust" to the filter set as the pipeline's handler:
+-----------------------------------------------------------+
| An XML:SAX::Pipeline |
| Intake |
| +---------+ +---------+ +---------+ Exhaust |
--+-->| Stage_0 |--->| Stage_1 |-->...-->| Stage_N |----------+----->
| +---------+ +---------+ +---------+ |
+-----------------------------------------------------------+
As with all SAX machines, a pipeline can also create an ad hoc parser (using XML::SAX::ParserFactory) if you ask it to parse something and
the first SAX processer in the pipeline can't handle a parse request:
+-------------------------------------------------------+
| An XML:SAX::Pipeline |
| Intake |
| +--------+ +---------+ +---------+ Exhaust |
| | Parser |-->| Stage_0 |-->...-->| Stage_N |----------+----->
| +--------+ +---------+ +---------+ |
+-------------------------------------------------------+
or if you specify an input file like so:
my $m = Pipeline(qw(
<input_file.xml
XML::Filter::Bar
XML::Filter::Baz
));
Pipelines (and machines) can also create ad hoc XML::SAX::Writer instances when you specify an output file handle (as shown in the
SYNOPSIS) or an output file:
my $m = Pipeline(qw(
XML::Filter::Bar
XML::Filter::Baz
>output_file.xml
));
And, thanks to Perl's magic open (see perlopentut), you can read and write from processes:
my $m = Pipeline(
"gen_xml.pl |",
"XML::Filter::Bar",
"XML::Filter::Baz",
"| consume_xml.pl",
);
This can be used with an XML::SAX::Tap to place a handy debugging tap in a pipeline (or other machine):
my $m = Pipeline(
"<input_file.xml"
"XML::Filter::Bar",
Tap( "| xmllint --format -" ),
"XML::Filter::Baz",
">output_file.xml",
);
METHODS
See XML::SAX::Machine for most of the methods.
new
my $pipeline = XML::SAX::Pipeline->new( @processors, \%options );
Creates a pipeline and links all of the given processors together. Longhand for Pipeline().
AUTHOR
Barrie Slaymaker <barries@slaysys.com>
COPYRIGHT
Copyright 2002, Barrie Slaymaker, All Rights Reserved.
You may use this module under the terms of the Artistic, GNU Public, or BSD licenses, your choice.
perl v5.10.0 2009-06-11 XML::SAX::Pipeline(3pm)