NAME

       stag-grep - filters a stag file (xml, itext, sxpr) for nodes of interest

SYNOPSIS

         stag-grep person -q name=fred file1.xml

         stag-grep person 'sub {shift->get_name =~ /^A*/}' file1.xml

         stag-grep -p My::Foo -w sxpr record 'sub{..}' file2

USAGE

         stag-grep [-p|parser PARSER] [-w|writer WRITER] NODE -q tag=val FILE

         stag-grep [-p|parser PARSER] [-w|writer WRITER] NODE SUB FILE

         stag-grep [-p|parser PARSER] [-w|writer WRITER]  NODE -f PERLFILE FILE

DESCRIPTION

       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)

ARGUMENTS

       -p|parser FORMAT
           FORMAT is one of xml, sxpr or itext, or the name of a perl module

           xml assumed as default

       -w|writer FORMAT
           FORMAT is one of xml, sxpr or itext, or the name of a perl module

       -c|count
           prints the number of nodes that pass the test

       -filterfile|f
           a file containing a perl subroutine (in place of the SUB argument)

       -q|query TAG1=VAL1 -q|query TAG2=VAL2 ...  -q|query TAGN=VALN
           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

       SUB 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

       NODE
           the name of the node/element we are filtering on

       FILE
           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

SEE ALSO

       Data::Stag