use Pod::Select;
## Select all the POD sections for each file in @filelist
## and print the result on standard output.
podselect(@filelist);
## Same as above, but write to tmp.out
podselect({-output => "tmp.out"}, @filelist):
## Select from the given filelist, only those POD sections that are
## within a 1st level section named any of: NAME, SYNOPSIS, OPTIONS.
podselect({-sections => ["NAME|SYNOPSIS", "OPTIONS"]}, @filelist):
## Select the "DESCRIPTION" section of the PODs from STDIN and write
## the result to STDERR.
podselect({-output => ">&STDERR", -sections => ["DESCRIPTION"]}, \*STDIN);
or
use Pod::Select;
## Create a parser object for selecting POD sections from the input
$parser = new Pod::Select();
## Select all the POD sections for each file in @filelist
## and print the result to tmp.out.
$parser->parse_from_file("<&STDIN", "tmp.out");
## Select from the given filelist, only those POD sections that are
## within a 1st level section named any of: NAME, SYNOPSIS, OPTIONS.
$parser->select("NAME|SYNOPSIS", "OPTIONS");
for (@filelist) { $parser->parse_from_file($_); }
## Select the "DESCRIPTION" and "SEE ALSO" sections of the PODs from
## STDIN and write the result to STDERR.
$parser->select("DESCRIPTION");
$parser->add_selection("SEE ALSO");
$parser->parse_from_filehandle(\*STDIN, \*STDERR);
podselect() is a function which will extract specified sections of pod documentation from an input stream. This ability is provided by the Pod::Select module which is a subclass of Pod::Parser. Pod::Select provides a method named select() to specify the set of POD sections to select for processing/printing. podselect() merely creates a Pod::Select object and then invokes the podselect() followed by parse_from_file().
The formal syntax of a section specification is:
Any omitted or empty regular expressions will default to ``.*''. Please note that each regular expression given is implicitly anchored by adding ``^'' and ``$'' to the beginning and end. Also, if a given regular expression starts with a ``!'' character, then the expression is negated (so "!foo" would match anything except "foo").
Some example section specifications follow.
"NAME|SYNOPSIS"
"DESCRIPTION/Question|Answer"
"/Comments"
"DESCRIPTION/!Comments"
"DESCRIPTION/!.+"
"/!.+"
($head1, $head2, $head3, ...) = $parser->curr_headings();
$head1 = $parser->curr_headings(1);
This method returns a list of the currently active section headings and subheadings in the document being parsed. The list of headings returned corresponds to the most recently parsed paragraph of the input.
If an argument is given, it must correspond to the desired section heading number, in which case only the specified section heading is returned. If there is no current section heading at the specified level, then "undef" is returned.
$parser->select($section_spec1,$section_spec2,...);
This method is used to select the particular sections and subsections of POD documentation that are to be printed and/or processed. The existing set of selected sections is replaced with the given set of sections. See add_selection() for adding to the current set of selected sections.
Each of the $section_spec arguments should be a section specification as described in ``SECTION SPECIFICATIONS''. The section specifications are parsed by this method and the resulting regular expressions are stored in the invoking object.
If no $section_spec arguments are given, then the existing set of selected sections is cleared out (which means "all" sections will be processed).
This method should not normally be overridden by subclasses.
$parser->add_selection($section_spec1,$section_spec2,...);
This method is used to add to the currently selected sections and subsections of POD documentation that are to be printed and/or processed. See <select()> for replacing the currently selected sections.
Each of the $section_spec arguments should be a section specification as described in ``SECTION SPECIFICATIONS''. The section specifications are parsed by this method and the resulting regular expressions are stored in the invoking object.
This method should not normally be overridden by subclasses.
$parser->clear_selections();
This method takes no arguments, it has the exact same effect as invoking <select()> with no arguments.
$boolean = $parser->match_section($heading1,$heading2,...);
Returns a value of true if the given section and subsection heading titles match any of the currently selected section specifications in effect from prior calls to select() and add_selection() (or if there are no explicitly selected/deselected sections).
The arguments $heading1, $heading2, etc. are the heading titles of the corresponding sections, subsections, etc. to try and match. If $headingN is omitted then it defaults to the current corresponding section heading title in the input.
This method should not normally be overridden by subclasses.
$boolean = $parser->is_selected($paragraph);
This method is used to determine if the block of text given in $paragraph falls within the currently selected set of POD sections and subsections to be printed or processed. This method is also responsible for keeping track of the current input section and subsections. It is assumed that $paragraph is the most recently read (but not yet processed) input paragraph.
The value returned will be true if the $paragraph and the rest of the text in the same section as $paragraph should be selected (included) for processing; otherwise a false value is returned.
podselect(\%options,@filelist);
podselect will print the raw (untranslated) POD paragraphs of all POD sections in the given input files specified by @filelist according to the options given in "\%options".
If any argument to podselect is a reference to a hash (associative array) then the values with the following keys are processed as follows:
All other arguments are optional and should correspond to filehandles to read from or the names of input files containing POD sections. A file name of "``, ''-`` or ''<&STDIN" will be interpreted to mean standard input (which is the default if no arguments are given).
Private data fields are stored in the hash-object whose reference is returned by the new() constructor for this class. The names of all private methods and data-fields used by Pod::Select begin with a prefix of ``_'' and match the regular expression "/^_\w+$/".
Brad Appleton <bradapp@enteract.com>
Based on code for pod2text written by Tom Christiansen <tchrist@mox.perl.com>
Pod::Select is part of the Pod::Parser distribution.