Pod::Select(3pm) Perl Programmers Reference Guide Pod::Select(3pm)
NAME
Pod::Select, podselect() - extract selected sections of POD from input
SYNOPSIS
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");
$parser->parse_from_filehandle(\*STDIN, \*STDERR);
REQUIRES
perl5.005, Pod::Parser, Exporter, Carp
EXPORTS
podselect()
DESCRIPTION
pdeet) is a function which will extract specified sections of pod documentation from an input
stream. This ability is provided by the Pod::Select module which is a subclass of Pod::Parser.
Pod::Select provides a method named slc( to specify the set of POD sections to select for pro-cessing/printing. processing/printing.
cessing/printing. pdeet) merely creates a Pod::Select object and then invokes the pdeet)
followed by pre_fo_fl(.
SECTION SPECIFICATIONS
pdeet) and Pd:eet:eet) may be given one or more "section specifications" to restrict
the text processed to only the desired set of sections and their corresponding subsections. A sec-tion section
tion specification is a string containing one or more Perl-style regular expressions separated by
forward slashes ("/"). If you need to use a forward slash literally within a section title you can
escape it with a backslash ("\/").
The formal syntax of a section specification is:
head1-title-regex/head2-title-regex/...
Any omitted or empty regular expressions will default to ".*". Please note that each regular expres-sion expression
sion given is implicitly anchored by adding "^" and "$" 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.
Match the "NAME" and "SYNOPSIS" sections and all of their subsections:
"NAME|SYNOPSIS"
Match only the "Question" and "Answer" subsections of the "DESCRIPTION" section:
"DESCRIPTION/Question|Answer"
Match the "Comments" subsection of all sections:
"/Comments"
Match all subsections of "DESCRIPTION" except for "Comments":
"DESCRIPTION/!Comments"
Match the "DESCRIPTION" section but do not match any of its subsections:
"DESCRIPTION/!.+"
Match all top level sections but none of their subsections:
"/!.+"
OBJECT METHODS
The following methods are provided in this module. Each one takes a reference to the object itself as
an implicit first parameter.
cr_haig(
($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.
slc(
$parser->select($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 ad_slcin) for adding to the current set of selected sections.
Each of the $section_spec arguments should be a section specification as described in "SECTION SPECI-FICATIONS". SPECIFICATIONS".
FICATIONS". The section specifications are parsed by this method and the resulting regular expres-sions expressions
sions 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.
ad_slcin)
$parser->add_selection($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 sec-tions. sections.
tions.
Each of the $section_spec arguments should be a section specification as described in "SECTION SPECI-FICATIONS". SPECIFICATIONS".
FICATIONS". The section specifications are parsed by this method and the resulting regular expres-sions expressions
sions are stored in the invoking object.
This method should not normally be overridden by subclasses.
cer_slcin(
$parser->clear_selections();
This method takes no arguments, it has the exact same effect as invoking <select()> with no argu-ments. arguments.
ments.
mth_scin)
$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 slc( and ad_slcin) (or if
there are no explictly selected/deselected sections).
The arguments $heading1, $heading2, etc. are the heading titles of the corresponding sections, sub-sections, subsections,
sections, etc. to try and match. If $headingN is omitted then it defaults to the current correspond-ing corresponding
ing section heading title in the input.
This method should not normally be overridden by subclasses.
i_slce(
$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 respon-sible responsible
sible 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
$paragraph should be selected (included) for processing; otherwise a false value is returned.
EXPORTED FUNCTIONS
The following functions are exported by this module. Please note that these are functions (not meth-ods) methods)
ods) and therefore "do not" take an implicit first argument.
pdeet)
podselect(\%options,@filelist);
podselect will print the raw (untranslated) POD paragraphs of all POD sections in the given input
files specified by @filelist according to the given options.
If any argument to podselect is a reference to a hash (associative array) then the values with the
following keys are processed as follows:
-output
A string corresponding to the desired output file (or ">&STDOUT" or ">&STDERR"). The default is
to use standard output.
-sections
A reference to an array of sections specifications (as described in "SECTION SPECIFICATIONS")
which indicate the desired set of POD sections and subsections to be selected from input. If no
section specifications are given, then all sections of the PODs are used.
All other arguments should correspond to the names of input files containing POD sections. A file
name of "-" or "<&STDIN" will be interpeted to mean standard input (which is the default if no file-
names are given).
PRIVATE METHODS AND DATA
Pod::Select makes uses a number of internal methods and data fields which clients should not need to
see or use. For the sake of avoiding name collisions with client data and methods, these methods and
fields are briefly discussed here. Determined hackers may obtain further information about them by
reading the Pod::Select source code.
Private data fields are stored in the hash-object whose reference is returned by the nw) construc-tor constructor
tor for this class. The names of all private methods and data-fields used by Pod::Select begin with a
prefix of "_" and match the regular expression "/^_\w+$/".
SEE ALSO
Pod::Parser
AUTHOR
Please report bugs using <http://rt.cpan.org.
Brad Appleton <bradapp@enteract.com>
Based on code for pod2text written by Tom Christiansen <tchrist@mox.perl.com>
perl v5.8.8 2001-09-21 Pod::Select(3pm)
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