Initial Commit
This commit is contained in:
756
database/perl/lib/Pod/Select.pm
Normal file
756
database/perl/lib/Pod/Select.pm
Normal file
@@ -0,0 +1,756 @@
|
||||
#############################################################################
|
||||
# Pod/Select.pm -- function to select portions of POD docs
|
||||
#
|
||||
# Copyright (C) 1996-2000 by Bradford Appleton. All rights reserved.
|
||||
# This file is part of "PodParser". PodParser is free software;
|
||||
# you can redistribute it and/or modify it under the same terms
|
||||
# as Perl itself.
|
||||
#############################################################################
|
||||
|
||||
package Pod::Select;
|
||||
use strict;
|
||||
|
||||
use vars qw($VERSION @ISA @EXPORT $MAX_HEADING_LEVEL %myData @section_headings @selected_sections);
|
||||
$VERSION = '1.63'; ## Current version of this package
|
||||
require 5.005; ## requires this Perl version or later
|
||||
|
||||
#############################################################################
|
||||
|
||||
=head1 NAME
|
||||
|
||||
Pod::Select, podselect() - extract selected sections of POD from input
|
||||
|
||||
=head1 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");
|
||||
$parser->parse_from_filehandle(\*STDIN, \*STDERR);
|
||||
|
||||
=head1 REQUIRES
|
||||
|
||||
perl5.005, Pod::Parser, Exporter, Carp
|
||||
|
||||
=head1 EXPORTS
|
||||
|
||||
podselect()
|
||||
|
||||
=head1 DESCRIPTION
|
||||
|
||||
B<NOTE: This module is considered legacy; modern Perl releases (5.18 and
|
||||
higher) are going to remove Pod-Parser from core and use L<Pod-Simple>
|
||||
for all things POD.>
|
||||
|
||||
B<podselect()> is a function which will extract specified sections of
|
||||
pod documentation from an input stream. This ability is provided by the
|
||||
B<Pod::Select> module which is a subclass of B<Pod::Parser>.
|
||||
B<Pod::Select> provides a method named B<select()> to specify the set of
|
||||
POD sections to select for processing/printing. B<podselect()> merely
|
||||
creates a B<Pod::Select> object and then invokes the B<podselect()>
|
||||
followed by B<parse_from_file()>.
|
||||
|
||||
=head1 SECTION SPECIFICATIONS
|
||||
|
||||
B<podselect()> and B<Pod::Select::select()> may be given one or more
|
||||
"section specifications" to restrict the text processed to only the
|
||||
desired set of sections and their corresponding subsections. A section
|
||||
specification is a string containing one or more Perl-style regular
|
||||
expressions separated by forward slashes ("/"). If you need to use a
|
||||
forward slash literally within a section title you can escape it with a
|
||||
backslash ("\/").
|
||||
|
||||
The formal syntax of a section specification is:
|
||||
|
||||
=over 4
|
||||
|
||||
=item *
|
||||
|
||||
I<head1-title-regex>/I<head2-title-regex>/...
|
||||
|
||||
=back
|
||||
|
||||
Any omitted or empty regular expressions will default to ".*".
|
||||
Please note that each regular expression given is implicitly
|
||||
anchored by adding "^" and "$" to the beginning and end. Also, if a
|
||||
given regular expression starts with a "!" character, then the
|
||||
expression is I<negated> (so C<!foo> would match anything I<except>
|
||||
C<foo>).
|
||||
|
||||
Some example section specifications follow.
|
||||
|
||||
=over 4
|
||||
|
||||
=item *
|
||||
|
||||
Match the C<NAME> and C<SYNOPSIS> sections and all of their subsections:
|
||||
|
||||
C<NAME|SYNOPSIS>
|
||||
|
||||
=item *
|
||||
|
||||
Match only the C<Question> and C<Answer> subsections of the C<DESCRIPTION>
|
||||
section:
|
||||
|
||||
C<DESCRIPTION/Question|Answer>
|
||||
|
||||
=item *
|
||||
|
||||
Match the C<Comments> subsection of I<all> sections:
|
||||
|
||||
C</Comments>
|
||||
|
||||
=item *
|
||||
|
||||
Match all subsections of C<DESCRIPTION> I<except> for C<Comments>:
|
||||
|
||||
C<DESCRIPTION/!Comments>
|
||||
|
||||
=item *
|
||||
|
||||
Match the C<DESCRIPTION> section but do I<not> match any of its subsections:
|
||||
|
||||
C<DESCRIPTION/!.+>
|
||||
|
||||
=item *
|
||||
|
||||
Match all top level sections but none of their subsections:
|
||||
|
||||
C</!.+>
|
||||
|
||||
=back
|
||||
|
||||
=begin _NOT_IMPLEMENTED_
|
||||
|
||||
=head1 RANGE SPECIFICATIONS
|
||||
|
||||
B<podselect()> and B<Pod::Select::select()> may be given one or more
|
||||
"range specifications" to restrict the text processed to only the
|
||||
desired ranges of paragraphs in the desired set of sections. A range
|
||||
specification is a string containing a single Perl-style regular
|
||||
expression (a regex), or else two Perl-style regular expressions
|
||||
(regexs) separated by a ".." (Perl's "range" operator is "..").
|
||||
The regexs in a range specification are delimited by forward slashes
|
||||
("/"). If you need to use a forward slash literally within a regex you
|
||||
can escape it with a backslash ("\/").
|
||||
|
||||
The formal syntax of a range specification is:
|
||||
|
||||
=over 4
|
||||
|
||||
=item *
|
||||
|
||||
/I<start-range-regex>/[../I<end-range-regex>/]
|
||||
|
||||
=back
|
||||
|
||||
Where each the item inside square brackets (the ".." followed by the
|
||||
end-range-regex) is optional. Each "range-regex" is of the form:
|
||||
|
||||
=cmd-expr text-expr
|
||||
|
||||
Where I<cmd-expr> is intended to match the name of one or more POD
|
||||
commands, and I<text-expr> is intended to match the paragraph text for
|
||||
the command. If a range-regex is supposed to match a POD command, then
|
||||
the first character of the regex (the one after the initial '/')
|
||||
absolutely I<must> be a single '=' character; it may not be anything
|
||||
else (not even a regex meta-character) if it is supposed to match
|
||||
against the name of a POD command.
|
||||
|
||||
If no I<=cmd-expr> is given then the text-expr will be matched against
|
||||
plain textblocks unless it is preceded by a space, in which case it is
|
||||
matched against verbatim text-blocks. If no I<text-expr> is given then
|
||||
only the command-portion of the paragraph is matched against.
|
||||
|
||||
Note that these two expressions are each implicitly anchored. This
|
||||
means that when matching against the command-name, there will be an
|
||||
implicit '^' and '$' around the given I<=cmd-expr>; and when matching
|
||||
against the paragraph text there will be an implicit '\A' and '\Z'
|
||||
around the given I<text-expr>.
|
||||
|
||||
Unlike with section-specs, the '!' character does I<not> have any special
|
||||
meaning (negation or otherwise) at the beginning of a range-spec!
|
||||
|
||||
Some example range specifications follow.
|
||||
|
||||
=over 4
|
||||
|
||||
=item
|
||||
Match all C<=for html> paragraphs:
|
||||
|
||||
C</=for html/>
|
||||
|
||||
=item
|
||||
Match all paragraphs between C<=begin html> and C<=end html>
|
||||
(note that this will I<not> work correctly if such sections
|
||||
are nested):
|
||||
|
||||
C</=begin html/../=end html/>
|
||||
|
||||
=item
|
||||
Match all paragraphs between the given C<=item> name until the end of the
|
||||
current section:
|
||||
|
||||
C</=item mine/../=head\d/>
|
||||
|
||||
=item
|
||||
Match all paragraphs between the given C<=item> until the next item, or
|
||||
until the end of the itemized list (note that this will I<not> work as
|
||||
desired if the item contains an itemized list nested within it):
|
||||
|
||||
C</=item mine/../=(item|back)/>
|
||||
|
||||
=back
|
||||
|
||||
=end _NOT_IMPLEMENTED_
|
||||
|
||||
=cut
|
||||
|
||||
#############################################################################
|
||||
|
||||
#use diagnostics;
|
||||
use Carp;
|
||||
use Pod::Parser 1.04;
|
||||
|
||||
@ISA = qw(Pod::Parser);
|
||||
@EXPORT = qw(&podselect);
|
||||
|
||||
## Maximum number of heading levels supported for '=headN' directives
|
||||
*MAX_HEADING_LEVEL = \3;
|
||||
|
||||
#############################################################################
|
||||
|
||||
=head1 OBJECT METHODS
|
||||
|
||||
The following methods are provided in this module. Each one takes a
|
||||
reference to the object itself as an implicit first parameter.
|
||||
|
||||
=cut
|
||||
|
||||
##---------------------------------------------------------------------------
|
||||
|
||||
## =begin _PRIVATE_
|
||||
##
|
||||
## =head1 B<_init_headings()>
|
||||
##
|
||||
## Initialize the current set of active section headings.
|
||||
##
|
||||
## =cut
|
||||
##
|
||||
## =end _PRIVATE_
|
||||
|
||||
sub _init_headings {
|
||||
my $self = shift;
|
||||
local *myData = $self;
|
||||
|
||||
## Initialize current section heading titles if necessary
|
||||
unless (defined $myData{_SECTION_HEADINGS}) {
|
||||
local *section_headings = $myData{_SECTION_HEADINGS} = [];
|
||||
for (my $i = 0; $i < $MAX_HEADING_LEVEL; ++$i) {
|
||||
$section_headings[$i] = '';
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
##---------------------------------------------------------------------------
|
||||
|
||||
=head1 B<curr_headings()>
|
||||
|
||||
($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 C<undef> is returned.
|
||||
|
||||
=cut
|
||||
|
||||
sub curr_headings {
|
||||
my $self = shift;
|
||||
$self->_init_headings() unless (defined $self->{_SECTION_HEADINGS});
|
||||
my @headings = @{ $self->{_SECTION_HEADINGS} };
|
||||
return (@_ > 0 and $_[0] =~ /^\d+$/) ? $headings[$_[0] - 1] : @headings;
|
||||
}
|
||||
|
||||
##---------------------------------------------------------------------------
|
||||
|
||||
=head1 B<select()>
|
||||
|
||||
$parser->select($section_spec1,$section_spec2,...);
|
||||
|
||||
This method is used to select the particular sections and subsections of
|
||||
POD documentation that are to be printed and/or processed. The existing
|
||||
set of selected sections is I<replaced> with the given set of sections.
|
||||
See B<add_selection()> for adding to the current set of selected
|
||||
sections.
|
||||
|
||||
Each of the C<$section_spec> arguments should be a section specification
|
||||
as described in L<"SECTION SPECIFICATIONS">. The section specifications
|
||||
are parsed by this method and the resulting regular expressions are
|
||||
stored in the invoking object.
|
||||
|
||||
If no C<$section_spec> arguments are given, then the existing set of
|
||||
selected sections is cleared out (which means C<all> sections will be
|
||||
processed).
|
||||
|
||||
This method should I<not> normally be overridden by subclasses.
|
||||
|
||||
=cut
|
||||
|
||||
sub select {
|
||||
my ($self, @sections) = @_;
|
||||
local *myData = $self;
|
||||
local $_;
|
||||
|
||||
### NEED TO DISCERN A SECTION-SPEC FROM A RANGE-SPEC (look for m{^/.+/$}?)
|
||||
|
||||
##---------------------------------------------------------------------
|
||||
## The following is a blatant hack for backward compatibility, and for
|
||||
## implementing add_selection(). If the *first* *argument* is the
|
||||
## string "+", then the remaining section specifications are *added*
|
||||
## to the current set of selections; otherwise the given section
|
||||
## specifications will *replace* the current set of selections.
|
||||
##
|
||||
## This should probably be fixed someday, but for the present time,
|
||||
## it seems incredibly unlikely that "+" would ever correspond to
|
||||
## a legitimate section heading
|
||||
##---------------------------------------------------------------------
|
||||
my $add = ($sections[0] eq '+') ? shift(@sections) : '';
|
||||
|
||||
## Reset the set of sections to use
|
||||
unless (@sections) {
|
||||
delete $myData{_SELECTED_SECTIONS} unless ($add);
|
||||
return;
|
||||
}
|
||||
$myData{_SELECTED_SECTIONS} = []
|
||||
unless ($add && exists $myData{_SELECTED_SECTIONS});
|
||||
local *selected_sections = $myData{_SELECTED_SECTIONS};
|
||||
|
||||
## Compile each spec
|
||||
for my $spec (@sections) {
|
||||
if ( defined($_ = _compile_section_spec($spec)) ) {
|
||||
## Store them in our sections array
|
||||
push(@selected_sections, $_);
|
||||
}
|
||||
else {
|
||||
carp qq{Ignoring section spec "$spec"!\n};
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
##---------------------------------------------------------------------------
|
||||
|
||||
=head1 B<add_selection()>
|
||||
|
||||
$parser->add_selection($section_spec1,$section_spec2,...);
|
||||
|
||||
This method is used to add to the currently selected sections and
|
||||
subsections of POD documentation that are to be printed and/or
|
||||
processed. See <select()> for replacing the currently selected sections.
|
||||
|
||||
Each of the C<$section_spec> arguments should be a section specification
|
||||
as described in L<"SECTION SPECIFICATIONS">. The section specifications
|
||||
are parsed by this method and the resulting regular expressions are
|
||||
stored in the invoking object.
|
||||
|
||||
This method should I<not> normally be overridden by subclasses.
|
||||
|
||||
=cut
|
||||
|
||||
sub add_selection {
|
||||
my $self = shift;
|
||||
return $self->select('+', @_);
|
||||
}
|
||||
|
||||
##---------------------------------------------------------------------------
|
||||
|
||||
=head1 B<clear_selections()>
|
||||
|
||||
$parser->clear_selections();
|
||||
|
||||
This method takes no arguments, it has the exact same effect as invoking
|
||||
<select()> with no arguments.
|
||||
|
||||
=cut
|
||||
|
||||
sub clear_selections {
|
||||
my $self = shift;
|
||||
return $self->select();
|
||||
}
|
||||
|
||||
##---------------------------------------------------------------------------
|
||||
|
||||
=head1 B<match_section()>
|
||||
|
||||
$boolean = $parser->match_section($heading1,$heading2,...);
|
||||
|
||||
Returns a value of true if the given section and subsection heading
|
||||
titles match any of the currently selected section specifications in
|
||||
effect from prior calls to B<select()> and B<add_selection()> (or if
|
||||
there are no explicitly selected/deselected sections).
|
||||
|
||||
The arguments C<$heading1>, C<$heading2>, etc. are the heading titles of
|
||||
the corresponding sections, subsections, etc. to try and match. If
|
||||
C<$headingN> is omitted then it defaults to the current corresponding
|
||||
section heading title in the input.
|
||||
|
||||
This method should I<not> normally be overridden by subclasses.
|
||||
|
||||
=cut
|
||||
|
||||
sub match_section {
|
||||
my $self = shift;
|
||||
my (@headings) = @_;
|
||||
local *myData = $self;
|
||||
|
||||
## Return true if no restrictions were explicitly specified
|
||||
my $selections = (exists $myData{_SELECTED_SECTIONS})
|
||||
? $myData{_SELECTED_SECTIONS} : undef;
|
||||
return 1 unless ((defined $selections) && @{$selections});
|
||||
|
||||
## Default any unspecified sections to the current one
|
||||
my @current_headings = $self->curr_headings();
|
||||
for (my $i = 0; $i < $MAX_HEADING_LEVEL; ++$i) {
|
||||
(defined $headings[$i]) or $headings[$i] = $current_headings[$i];
|
||||
}
|
||||
|
||||
## Look for a match against the specified section expressions
|
||||
for my $section_spec ( @{$selections} ) {
|
||||
##------------------------------------------------------
|
||||
## Each portion of this spec must match in order for
|
||||
## the spec to be matched. So we will start with a
|
||||
## match-value of 'true' and logically 'and' it with
|
||||
## the results of matching a given element of the spec.
|
||||
##------------------------------------------------------
|
||||
my $match = 1;
|
||||
for (my $i = 0; $i < $MAX_HEADING_LEVEL; ++$i) {
|
||||
my $regex = $section_spec->[$i];
|
||||
my $negated = ($regex =~ s/^\!//);
|
||||
$match &= ($negated ? ($headings[$i] !~ /${regex}/)
|
||||
: ($headings[$i] =~ /${regex}/));
|
||||
last unless ($match);
|
||||
}
|
||||
return 1 if ($match);
|
||||
}
|
||||
return 0; ## no match
|
||||
}
|
||||
|
||||
##---------------------------------------------------------------------------
|
||||
|
||||
=head1 B<is_selected()>
|
||||
|
||||
$boolean = $parser->is_selected($paragraph);
|
||||
|
||||
This method is used to determine if the block of text given in
|
||||
C<$paragraph> falls within the currently selected set of POD sections
|
||||
and subsections to be printed or processed. This method is also
|
||||
responsible for keeping track of the current input section and
|
||||
subsections. It is assumed that C<$paragraph> is the most recently read
|
||||
(but not yet processed) input paragraph.
|
||||
|
||||
The value returned will be true if the C<$paragraph> and the rest of the
|
||||
text in the same section as C<$paragraph> should be selected (included)
|
||||
for processing; otherwise a false value is returned.
|
||||
|
||||
=cut
|
||||
|
||||
sub is_selected {
|
||||
my ($self, $paragraph) = @_;
|
||||
local $_;
|
||||
local *myData = $self;
|
||||
|
||||
$self->_init_headings() unless (defined $myData{_SECTION_HEADINGS});
|
||||
|
||||
## Keep track of current sections levels and headings
|
||||
$_ = $paragraph;
|
||||
if (/^=((?:sub)*)(?:head(?:ing)?|sec(?:tion)?)(\d*)\s+(.*?)\s*$/)
|
||||
{
|
||||
## This is a section heading command
|
||||
my ($level, $heading) = ($2, $3);
|
||||
$level = 1 + (length($1) / 3) if ((! length $level) || (length $1));
|
||||
## Reset the current section heading at this level
|
||||
$myData{_SECTION_HEADINGS}->[$level - 1] = $heading;
|
||||
## Reset subsection headings of this one to empty
|
||||
for (my $i = $level; $i < $MAX_HEADING_LEVEL; ++$i) {
|
||||
$myData{_SECTION_HEADINGS}->[$i] = '';
|
||||
}
|
||||
}
|
||||
|
||||
return $self->match_section();
|
||||
}
|
||||
|
||||
#############################################################################
|
||||
|
||||
=head1 EXPORTED FUNCTIONS
|
||||
|
||||
The following functions are exported by this module. Please note that
|
||||
these are functions (not methods) and therefore C<do not> take an
|
||||
implicit first argument.
|
||||
|
||||
=cut
|
||||
|
||||
##---------------------------------------------------------------------------
|
||||
|
||||
=head1 B<podselect()>
|
||||
|
||||
podselect(\%options,@filelist);
|
||||
|
||||
B<podselect> will print the raw (untranslated) POD paragraphs of all
|
||||
POD sections in the given input files specified by C<@filelist>
|
||||
according to the options given in C<\%options>.
|
||||
|
||||
If any argument to B<podselect> is a reference to a hash
|
||||
(associative array) then the values with the following keys are
|
||||
processed as follows:
|
||||
|
||||
=over 4
|
||||
|
||||
=item B<-output>
|
||||
|
||||
A string corresponding to the desired output file (or ">&STDOUT"
|
||||
or ">&STDERR"), or a filehandle to write on. The default is to use
|
||||
standard output.
|
||||
|
||||
=item B<-sections>
|
||||
|
||||
A reference to an array of sections specifications (as described in
|
||||
L<"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.
|
||||
|
||||
=begin _NOT_IMPLEMENTED_
|
||||
|
||||
=item B<-ranges>
|
||||
|
||||
A reference to an array of range specifications (as described in
|
||||
L<"RANGE SPECIFICATIONS">) which indicate the desired range of POD
|
||||
paragraphs to be selected from the desired input sections. If no range
|
||||
specifications are given, then all paragraphs of the desired sections
|
||||
are used.
|
||||
|
||||
=end _NOT_IMPLEMENTED_
|
||||
|
||||
=back
|
||||
|
||||
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).
|
||||
|
||||
=cut
|
||||
|
||||
sub podselect {
|
||||
my(@argv) = @_;
|
||||
my %defaults = ();
|
||||
my $pod_parser = new Pod::Select(%defaults);
|
||||
my $num_inputs = 0;
|
||||
my $output = '>&STDOUT';
|
||||
my %opts;
|
||||
local $_;
|
||||
for (@argv) {
|
||||
my $ref = ref($_);
|
||||
if ($ref && $ref eq 'HASH') {
|
||||
%opts = (%defaults, %{$_});
|
||||
|
||||
##-------------------------------------------------------------
|
||||
## Need this for backward compatibility since we formerly used
|
||||
## options that were all uppercase words rather than ones that
|
||||
## looked like Unix command-line options.
|
||||
## to be uppercase keywords)
|
||||
##-------------------------------------------------------------
|
||||
%opts = map {
|
||||
my ($key, $val) = (lc $_, $opts{$_});
|
||||
$key =~ s/^(?=\w)/-/;
|
||||
$key =~ /^-se[cl]/ and $key = '-sections';
|
||||
#! $key eq '-range' and $key .= 's';
|
||||
($key => $val);
|
||||
} (keys %opts);
|
||||
|
||||
## Process the options
|
||||
(exists $opts{'-output'}) and $output = $opts{'-output'};
|
||||
|
||||
## Select the desired sections
|
||||
$pod_parser->select(@{ $opts{'-sections'} })
|
||||
if ( (defined $opts{'-sections'})
|
||||
&& ((ref $opts{'-sections'}) eq 'ARRAY') );
|
||||
|
||||
#! ## Select the desired paragraph ranges
|
||||
#! $pod_parser->select(@{ $opts{'-ranges'} })
|
||||
#! if ( (defined $opts{'-ranges'})
|
||||
#! && ((ref $opts{'-ranges'}) eq 'ARRAY') );
|
||||
}
|
||||
elsif(!$ref || $ref eq 'GLOB') {
|
||||
$pod_parser->parse_from_file($_, $output);
|
||||
++$num_inputs;
|
||||
}
|
||||
else {
|
||||
croak "Input from $ref reference not supported!\n";
|
||||
}
|
||||
}
|
||||
$pod_parser->parse_from_file('-') unless ($num_inputs > 0);
|
||||
}
|
||||
|
||||
#############################################################################
|
||||
|
||||
=head1 PRIVATE METHODS AND DATA
|
||||
|
||||
B<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 B<Pod::Select> source code.
|
||||
|
||||
Private data fields are stored in the hash-object whose reference is
|
||||
returned by the B<new()> constructor for this class. The names of all
|
||||
private methods and data-fields used by B<Pod::Select> begin with a
|
||||
prefix of "_" and match the regular expression C</^_\w+$/>.
|
||||
|
||||
=cut
|
||||
|
||||
##---------------------------------------------------------------------------
|
||||
|
||||
=begin _PRIVATE_
|
||||
|
||||
=head1 B<_compile_section_spec()>
|
||||
|
||||
$listref = $parser->_compile_section_spec($section_spec);
|
||||
|
||||
This function (note it is a function and I<not> a method) takes a
|
||||
section specification (as described in L<"SECTION SPECIFICATIONS">)
|
||||
given in C<$section_sepc>, and compiles it into a list of regular
|
||||
expressions. If C<$section_spec> has no syntax errors, then a reference
|
||||
to the list (array) of corresponding regular expressions is returned;
|
||||
otherwise C<undef> is returned and an error message is printed (using
|
||||
B<carp>) for each invalid regex.
|
||||
|
||||
=end _PRIVATE_
|
||||
|
||||
=cut
|
||||
|
||||
sub _compile_section_spec {
|
||||
my ($section_spec) = @_;
|
||||
my (@regexs, $negated);
|
||||
|
||||
## Compile the spec into a list of regexs
|
||||
local $_ = $section_spec;
|
||||
s{\\\\}{\001}g; ## handle escaped backward slashes
|
||||
s{\\/}{\002}g; ## handle escaped forward slashes
|
||||
|
||||
## Parse the regexs for the heading titles
|
||||
@regexs = split(/\//, $_, $MAX_HEADING_LEVEL);
|
||||
|
||||
## Set default regex for omitted levels
|
||||
for (my $i = 0; $i < $MAX_HEADING_LEVEL; ++$i) {
|
||||
$regexs[$i] = '.*' unless ((defined $regexs[$i])
|
||||
&& (length $regexs[$i]));
|
||||
}
|
||||
## Modify the regexs as needed and validate their syntax
|
||||
my $bad_regexs = 0;
|
||||
for (@regexs) {
|
||||
$_ .= '.+' if ($_ eq '!');
|
||||
s{\001}{\\\\}g; ## restore escaped backward slashes
|
||||
s{\002}{\\/}g; ## restore escaped forward slashes
|
||||
$negated = s/^\!//; ## check for negation
|
||||
eval "m{$_}"; ## check regex syntax
|
||||
if ($@) {
|
||||
++$bad_regexs;
|
||||
carp qq{Bad regular expression /$_/ in "$section_spec": $@\n};
|
||||
}
|
||||
else {
|
||||
## Add the forward and rear anchors (and put the negator back)
|
||||
$_ = '^' . $_ unless (/^\^/);
|
||||
$_ = $_ . '$' unless (/\$$/);
|
||||
$_ = '!' . $_ if ($negated);
|
||||
}
|
||||
}
|
||||
return (! $bad_regexs) ? [ @regexs ] : undef;
|
||||
}
|
||||
|
||||
##---------------------------------------------------------------------------
|
||||
|
||||
=begin _PRIVATE_
|
||||
|
||||
=head2 $self->{_SECTION_HEADINGS}
|
||||
|
||||
A reference to an array of the current section heading titles for each
|
||||
heading level (note that the first heading level title is at index 0).
|
||||
|
||||
=end _PRIVATE_
|
||||
|
||||
=cut
|
||||
|
||||
##---------------------------------------------------------------------------
|
||||
|
||||
=begin _PRIVATE_
|
||||
|
||||
=head2 $self->{_SELECTED_SECTIONS}
|
||||
|
||||
A reference to an array of references to arrays. Each subarray is a list
|
||||
of anchored regular expressions (preceded by a "!" if the expression is to
|
||||
be negated). The index of the expression in the subarray should correspond
|
||||
to the index of the heading title in C<$self-E<gt>{_SECTION_HEADINGS}>
|
||||
that it is to be matched against.
|
||||
|
||||
=end _PRIVATE_
|
||||
|
||||
=cut
|
||||
|
||||
#############################################################################
|
||||
|
||||
=head1 SEE ALSO
|
||||
|
||||
L<Pod::Parser>
|
||||
|
||||
=head1 AUTHOR
|
||||
|
||||
Please report bugs using L<http://rt.cpan.org>.
|
||||
|
||||
Brad Appleton E<lt>bradapp@enteract.comE<gt>
|
||||
|
||||
Based on code for B<pod2text> written by
|
||||
Tom Christiansen E<lt>tchrist@mox.perl.comE<gt>
|
||||
|
||||
B<Pod::Select> is part of the L<Pod::Parser> distribution.
|
||||
|
||||
=cut
|
||||
|
||||
1;
|
||||
# vim: ts=4 sw=4 et
|
||||
Reference in New Issue
Block a user