stag-grep.pl - filters a stag file (xml, itext, sxpr) for nodes of interest
stag-grep.pl person -q name=fred file1.xml stag-grep.pl person 'sub {shift->get_name =~ /^A*/}' file1.xml stag-grep.pl -p My::Foo -w sxpr record 'sub{..}' file2
stag-grep.pl [-p|parser PARSER] [-w|writer WRITER] NODE -q tag=val FILE stag-grep.pl [-p|parser PARSER] [-w|writer WRITER] NODE SUB FILE stag-grep.pl [-p|parser PARSER] [-w|writer WRITER] NODE -f PERLFILE FILE
parsers an input file using the specified parser (which may be a built in stag parser, such as xml) and filters the resulting stag tree according to a user-supplied subroutine, writing out only the nodes/elements that pass the test.
the parser is event based, so it should be able to handle large files (although if the node you parse is large, it will take up more memory)
FORMAT is one of xml, sxpr or itext, or the name of a perl module
xml assumed as default
prints the number of nodes that pass the test
a file containing a perl subroutine (in place of the SUB argument)
filters based on the field TAG
other operators can be used too - eg <, <=, etc
multiple q arguments can be passed in
for more complex operations, pass in your own subroutine, see below
a perl subroutine. this subroutine is evaluated evry time NODE is encountered - the stag object for NODE is passed into the subroutine.
if the subroutine passes, the node will be passed to the writer for display
the name of the node/element we are filtering on
the file to be parser. If no parser option is supplied, this is assumed to a be a stag compatible syntax (xml, sxpr or itext); otherwise you should parse in a parser name or a parser module that throws stag events
Data::Stag
To install Data::Stag, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Data::Stag
CPAN shell
perl -MCPAN -e shell install Data::Stag
For more information on module installation, please visit the detailed CPAN module installation guide.