#############################################################################
# Pod/Checker.pm -- check pod documents for syntax errors
#
# Copyright (C) 1994-2000 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::Checker;
use strict;
use vars qw($VERSION @ISA @EXPORT %VALID_COMMANDS %VALID_SEQUENCES);
$VERSION = '1.60'; ## Current version of this package
require 5.005; ## requires this Perl version or later
use Pod::ParseUtils; ## for hyperlinks and lists
=head1 NAME
Pod::Checker, podchecker() - check pod documents for syntax errors
=head1 SYNOPSIS
use Pod::Checker;
$num_errors = podchecker($filepath, $outputpath, %options);
my $checker = new Pod::Checker %options;
$checker->parse_from_file($filepath, \*STDERR);
=head1 OPTIONS/ARGUMENTS
C<$filepath> is the input POD to read and C<$outputpath> is
where to write POD syntax error messages. Either argument may be a scalar
indicating a file-path, or else a reference to an open filehandle.
If unspecified, the input-file it defaults to C<\*STDIN>, and
the output-file defaults to C<\*STDERR>.
=head2 podchecker()
This function can take a hash of options:
=over 4
=item B<-warnings> =E<gt> I<val>
Turn warnings on/off. I<val> is usually 1 for on, but higher values
trigger additional warnings. See L<"Warnings">.
=back
=head1 DESCRIPTION
B<podchecker> will perform syntax checking of Perl5 POD format documentation.
Curious/ambitious users are welcome to propose additional features they wish
to see in B<Pod::Checker> and B<podchecker> and verify that the checks are
consistent with L<perlpod>.
The following checks are currently performed:
=over 4
=item *
Unknown '=xxxx' commands, unknown 'XE<lt>...E<gt>' interior-sequences,
and unterminated interior sequences.
=item *
Check for proper balancing of C<=begin> and C<=end>. The contents of such
a block are generally ignored, i.e. no syntax checks are performed.
=item *
Check for proper nesting and balancing of C<=over>, C<=item> and C<=back>.
=item *
Check for same nested interior-sequences (e.g.
C<LE<lt>...LE<lt>...E<gt>...E<gt>>).
=item *
Check for malformed or non-existing entities C<EE<lt>...E<gt>>.
=item *
Check for correct syntax of hyperlinks C<LE<lt>...E<gt>>. See L<perlpod>
for details.
=item *
Check for unresolved document-internal links. This check may also reveal
misspelled links that seem to be internal links but should be links
to something else.
=back
=head1 DIAGNOSTICS
=head2 Errors
=over 4
=item * empty =headn
A heading (C<=head1> or C<=head2>) without any text? That ain't no
heading!
=item * =over on line I<N> without closing =back
The C<=over> command does not have a corresponding C<=back> before the
next heading (C<=head1> or C<=head2>) or the end of the file.
=item * =item without previous =over
=item * =back without previous =over
An C<=item> or C<=back> command has been found outside a
C<=over>/C<=back> block.
=item * No argument for =begin
A C<=begin> command was found that is not followed by the formatter
specification.
=item * =end without =begin
A standalone C<=end> command was found.
=item * Nested =begin's
There were at least two consecutive C<=begin> commands without
the corresponding C<=end>. Only one C<=begin> may be active at
a time.
=item * =for without formatter specification
There is no specification of the formatter after the C<=for> command.
=item * Apparent command =foo not preceded by blank line
A command which has ended up in the middle of a paragraph or other command,
such as
=item one
=item two <-- bad
=item * unresolved internal link I<NAME>
The given link to I<NAME> does not have a matching node in the current
POD. This also happened when a single word node name is not enclosed in
C<"">.
=item * Unknown command "I<CMD>"
An invalid POD command has been found. Valid are C<=head1>, C<=head2>,
C<=head3>, C<=head4>, C<=over>, C<=item>, C<=back>, C<=begin>, C<=end>,
C<=for>, C<=pod>, C<=cut>
=item * Unknown interior-sequence "I<SEQ>"
An invalid markup command has been encountered. Valid are:
C<BE<lt>E<gt>>, C<CE<lt>E<gt>>, C<EE<lt>E<gt>>, C<FE<lt>E<gt>>,
C<IE<lt>E<gt>>, C<LE<lt>E<gt>>, C<SE<lt>E<gt>>, C<XE<lt>E<gt>>,
C<ZE<lt>E<gt>>
=item * nested commands I<CMD>E<lt>...I<CMD>E<lt>...E<gt>...E<gt>
Two nested identical markup commands have been found. Generally this
does not make sense.
=item * garbled entity I<STRING>
The I<STRING> found cannot be interpreted as a character entity.
=item * Entity number out of range
An entity specified by number (dec, hex, oct) is out of range (1-255).
=item * malformed link LE<lt>E<gt>
The link found cannot be parsed because it does not conform to the
syntax described in L<perlpod>.
=item * nonempty ZE<lt>E<gt>
The C<ZE<lt>E<gt>> sequence is supposed to be empty.
=item * empty XE<lt>E<gt>
The index entry specified contains nothing but whitespace.
=item * Spurious text after =pod / =cut
The commands C<=pod> and C<=cut> do not take any arguments.
=item * Spurious =cut command
A C<=cut> command was found without a preceding POD paragraph.
=item * Spurious =pod command
A C<=pod> command was found after a preceding POD paragraph.
=item * Spurious character(s) after =back
The C<=back> command does not take any arguments.
=back
=head2 Warnings
These may not necessarily cause trouble, but indicate mediocre style.
=over 4
=item * multiple occurrence of link target I<name>
The POD file has some C<=item> and/or C<=head> commands that have
the same text. Potential hyperlinks to such a text cannot be unique then.
This warning is printed only with warning level greater than one.
=item * line containing nothing but whitespace in paragraph
There is some whitespace on a seemingly empty line. POD is very sensitive
to such things, so this is flagged. B<vi> users switch on the B<list>
option to avoid this problem.
=begin _disabled_
=item * file does not start with =head
The file starts with a different POD directive than head.
This is most probably something you do not want.
=end _disabled_
=item * previous =item has no contents
There is a list C<=item> right above the flagged line that has no
text contents. You probably want to delete empty items.
=item * preceding non-item paragraph(s)
A list introduced by C<=over> starts with a text or verbatim paragraph,
but continues with C<=item>s. Move the non-item paragraph out of the
C<=over>/C<=back> block.
=item * =item type mismatch (I<one> vs. I<two>)
A list started with e.g. a bullet-like C<=item> and continued with a
numbered one. This is obviously inconsistent. For most translators the
type of the I<first> C<=item> determines the type of the list.
=item * I<N> unescaped C<E<lt>E<gt>> in paragraph
Angle brackets not written as C<E<lt>ltE<gt>> and C<E<lt>gtE<gt>>
can potentially cause errors as they could be misinterpreted as
markup commands. This is only printed when the -warnings level is
greater than 1.
=item * Unknown entity
A character entity was found that does not belong to the standard
ISO set or the POD specials C<verbar> and C<sol>.
=item * No items in =over
The list opened with C<=over> does not contain any items.
=item * No argument for =item
C<=item> without any parameters is deprecated. It should either be followed
by C<*> to indicate an unordered list, by a number (optionally followed
by a dot) to indicate an ordered (numbered) list or simple text for a
definition list.
=item * empty section in previous paragraph
The previous section (introduced by a C<=head> command) does not contain
any text. This usually indicates that something is missing. Note: A
C<=head1> followed immediately by C<=head2> does not trigger this warning.
=item * Verbatim paragraph in NAME section
The NAME section (C<=head1 NAME>) should consist of a single paragraph
with the script/module name, followed by a dash `-' and a very short
description of what the thing is good for.
=item * =headI<n> without preceding higher level
For example if there is a C<=head2> in the POD file prior to a
C<=head1>.
=back
=head2 Hyperlinks
There are some warnings with respect to malformed hyperlinks:
=over 4
=item * ignoring leading/trailing whitespace in link
There is whitespace at the beginning or the end of the contents of
LE<lt>...E<gt>.
=item * (section) in '$page' deprecated
There is a section detected in the page name of LE<lt>...E<gt>, e.g.
C<LE<lt>passwd(2)E<gt>>. POD hyperlinks may point to POD documents only.
Please write C<CE<lt>passwd(2)E<gt>> instead. Some formatters are able
to expand this to appropriate code. For links to (builtin) functions,
please say C<LE<lt>perlfunc/mkdirE<gt>>, without ().
=item * alternative text/node '%s' contains non-escaped | or /
The characters C<|> and C</> are special in the LE<lt>...E<gt> context.
Although the hyperlink parser does its best to determine which "/" is
text and which is a delimiter in case of doubt, one ought to escape
these literal characters like this:
/ E<sol>
| E<verbar>
=back
=head1 RETURN VALUE
B<podchecker> returns the number of POD syntax errors found or -1 if
there were no POD commands at all found in the file.
=head1 EXAMPLES
See L</SYNOPSIS>
=head1 INTERFACE
While checking, this module collects document properties, e.g. the nodes
for hyperlinks (C<=headX>, C<=item>) and index entries (C<XE<lt>E<gt>>).
POD translators can use this feature to syntax-check and get the nodes in
a first pass before actually starting to convert. This is expensive in terms
of execution time, but allows for very robust conversions.
Since PodParser-1.24 the B<Pod::Checker> module uses only the B<poderror>
method to print errors and warnings. The summary output (e.g.
"Pod syntax OK") has been dropped from the module and has been included in
B<podchecker> (the script). This allows users of B<Pod::Checker> to
control completely the output behavior. Users of B<podchecker> (the script)
get the well-known behavior.
=cut
#############################################################################
#use diagnostics;
use Carp qw(croak);
use Exporter;
use Pod::Parser;
@ISA = qw(Pod::Parser);
@EXPORT = qw(&podchecker);
my %VALID_COMMANDS = (
'pod' => 1,
'cut' => 1,
'head1' => 1,
'head2' => 1,
'head3' => 1,
'head4' => 1,
'over' => 1,
'back' => 1,
'item' => 1,
'for' => 1,
'begin' => 1,
'end' => 1,
'encoding' => 1,
);
my %VALID_SEQUENCES = (
'I' => 1,
'B' => 1,
'S' => 1,
'C' => 1,
'L' => 1,
'F' => 1,
'X' => 1,
'Z' => 1,
'E' => 1,
);
# stolen from HTML::Entities
my %ENTITIES = (
# Some normal chars that have special meaning in SGML context
amp => '&', # ampersand
'gt' => '>', # greater than
'lt' => '<', # less than
quot => '"', # double quote
# PUBLIC ISO 8879-1986//ENTITIES Added Latin 1//EN//HTML
AElig => '�', # capital AE diphthong (ligature)
Aacute => '�', # capital A, acute accent
Acirc => '�', # capital A, circumflex accent
Agrave => '�', # capital A, grave accent
Aring => '�', # capital A, ring
Atilde => '�', # capital A, tilde
Auml => '�', # capital A, dieresis or umlaut mark
Ccedil => '�', # capital C, cedilla
ETH => '�', # capital Eth, Icelandic
Eacute => '�', # capital E, acute accent
Ecirc => '�', # capital E, circumflex accent
Egrave => '�', # capital E, grave accent
Euml => '�', # capital E, dieresis or umlaut mark
Iacute => '�', # capital I, acute accent
Icirc => '�', # capital I, circumflex accent
Igrave => '�', # capital I, grave accent
Iuml => '�', # capital I, dieresis or umlaut mark
Ntilde => '�', # capital N, tilde
Oacute => '�', # capital O, acute accent
Ocirc => '�', # capital O, circumflex accent
Ograve => '�', # capital O, grave accent
Oslash => '�', # capital O, slash
Otilde => '�', # capital O, tilde
Ouml => '�', # capital O, dieresis or umlaut mark
THORN => '�', # capital THORN, Icelandic
Uacute => '�', # capital U, acute accent
Ucirc => '�', # capital U, circumflex accent
Ugrave => '�', # capital U, grave accent
Uuml => '�', # capital U, dieresis or umlaut mark
Yacute => '�', # capital Y, acute accent
aacute => '�', # small a, acute accent
acirc => '�', # small a, circumflex accent
aelig => '�', # small ae diphthong (ligature)
agrave => '�', # small a, grave accent
aring => '�', # small a, ring
atilde => '�', # small a, tilde
auml => '�', # small a, dieresis or umlaut mark
ccedil => '�', # small c, cedilla
eacute => '�', # small e, acute accent
ecirc => '�', # small e, circumflex accent
egrave => '�', # small e, grave accent
eth => '�', # small eth, Icelandic
euml => '�', # small e, dieresis or umlaut mark
iacute => '�', # small i, acute accent
icirc => '�', # small i, circumflex accent
igrave => '�', # small i, grave accent
iuml => '�', # small i, dieresis or umlaut mark
ntilde => '�', # small n, tilde
oacute => '�', # small o, acute accent
ocirc => '�', # small o, circumflex accent
ograve => '�', # small o, grave accent
oslash => '�', # small o, slash
otilde => '�', # small o, tilde
ouml => '�', # small o, dieresis or umlaut mark
szlig => '�', # small sharp s, German (sz ligature)
thorn => '�', # small thorn, Icelandic
uacute => '�', # small u, acute accent
ucirc => '�', # small u, circumflex accent
ugrave => '�', # small u, grave accent
uuml => '�', # small u, dieresis or umlaut mark
yacute => '�', # small y, acute accent
yuml => '�', # small y, dieresis or umlaut mark
# Some extra Latin 1 chars that are listed in the HTML3.2 draft (21-May-96)
copy => '�', # copyright sign
reg => '�', # registered sign
nbsp => "\240", # non breaking space
# Additional ISO-8859/1 entities listed in rfc1866 (section 14)
iexcl => '�',
cent => '�',
pound => '�',
curren => '�',
yen => '�',
brvbar => '�',
sect => '�',
uml => '�',
ordf => '�',
laquo => '�',
'not' => '�', # not is a keyword in perl
shy => '�',
macr => '�',
deg => '�',
plusmn => '�',
sup1 => '�',
sup2 => '�',
sup3 => '�',
acute => '�',
micro => '�',
para => '�',
middot => '�',
cedil => '�',
ordm => '�',
raquo => '�',
frac14 => '�',
frac12 => '�',
frac34 => '�',
iquest => '�',
'times' => '�', # times is a keyword in perl
divide => '�',
# some POD special entities
verbar => '|',
sol => '/'
);
##---------------------------------------------------------------------------
##---------------------------------
## Function definitions begin here
##---------------------------------
sub podchecker {
my ($infile, $outfile, %options) = @_;
local $_;
## Set defaults
$infile ||= \*STDIN;
$outfile ||= \*STDERR;
## Now create a pod checker
my $checker = new Pod::Checker(%options);
## Now check the pod document for errors
$checker->parse_from_file($infile, $outfile);
## Return the number of errors found
return $checker->num_errors();
}
##---------------------------------------------------------------------------
##-------------------------------
## Method definitions begin here
##-------------------------------
##################################
=over 4
=item C<Pod::Checker-E<gt>new( %options )>
Return a reference to a new Pod::Checker object that inherits from
Pod::Parser and is used for calling the required methods later. The
following options are recognized:
C<-warnings =E<gt> num>
Print warnings if C<num> is true. The higher the value of C<num>,
the more warnings are printed. Currently there are only levels 1 and 2.
C<-quiet =E<gt> num>
If C<num> is true, do not print any errors/warnings. This is useful
when Pod::Checker is used to munge POD code into plain text from within
POD formatters.
=cut
## sub new {
## my $this = shift;
## my $class = ref($this) || $this;
## my %params = @_;
## my $self = {%params};
## bless $self, $class;
## $self->initialize();
## return $self;
## }
sub initialize {
my $self = shift;
## Initialize number of errors, and setup an error function to
## increment this number and then print to the designated output.
$self->{_NUM_ERRORS} = 0;
$self->{_NUM_WARNINGS} = 0;
$self->{-quiet} ||= 0;
# set the error handling subroutine
$self->errorsub($self->{-quiet} ? sub { 1; } : 'poderror');
$self->{_commands} = 0; # total number of POD commands encountered
$self->{_list_stack} = []; # stack for nested lists
$self->{_have_begin} = ''; # stores =begin
$self->{_links} = []; # stack for internal hyperlinks
$self->{_nodes} = []; # stack for =head/=item nodes
$self->{_index} = []; # text in X<>
# print warnings?
$self->{-warnings} = 1 unless(defined $self->{-warnings});
$self->{_current_head1} = ''; # the current =head1 block
$self->parseopts(-process_cut_cmd => 1, -warnings => $self->{-warnings});
}
##################################
=item C<$checker-E<gt>poderror( @args )>
=item C<$checker-E<gt>poderror( {%opts}, @args )>
Internal method for printing errors and warnings. If no options are
given, simply prints "@_". The following options are recognized and used
to form the output:
-msg
A message to print prior to C<@args>.
-line
The line number the error occurred in.
-file
The file (name) the error occurred in.
-severity
The error level, should be 'WARNING' or 'ERROR'.
=cut
# Invoked as $self->poderror( @args ), or $self->poderror( {%opts}, @args )
sub poderror {
my $self = shift;
my %opts = (ref $_[0]) ? %{shift()} : ();
## Retrieve options
chomp( my $msg = ($opts{-msg} || '')."@_" );
my $line = (exists $opts{-line}) ? " at line $opts{-line}" : '';
my $file = (exists $opts{-file}) ? " in file $opts{-file}" : '';
unless (exists $opts{-severity}) {
## See if can find severity in message prefix
$opts{-severity} = $1 if ( $msg =~ s/^\**\s*([A-Z]{3,}):\s+// );
}
my $severity = (exists $opts{-severity}) ? "*** $opts{-severity}: " : '';
## Increment error count and print message "
++($self->{_NUM_ERRORS})
if(!%opts || ($opts{-severity} && $opts{-severity} eq 'ERROR'));
++($self->{_NUM_WARNINGS})
if(!%opts || ($opts{-severity} && $opts{-severity} eq 'WARNING'));
unless($self->{-quiet}) {
my $out_fh = $self->output_handle() || \*STDERR;
print $out_fh ($severity, $msg, $line, $file, "\n")
if($self->{-warnings} || !%opts || $opts{-severity} ne 'WARNING');
}
}
##################################
=item C<$checker-E<gt>num_errors()>
Set (if argument specified) and retrieve the number of errors found.
=cut
sub num_errors {
return (@_ > 1) ? ($_[0]->{_NUM_ERRORS} = $_[1]) : $_[0]->{_NUM_ERRORS};
}
##################################
=item C<$checker-E<gt>num_warnings()>
Set (if argument specified) and retrieve the number of warnings found.
=cut
sub num_warnings {
return (@_ > 1) ? ($_[0]->{_NUM_WARNINGS} = $_[1]) : $_[0]->{_NUM_WARNINGS};
}
##################################
=item C<$checker-E<gt>name()>
Set (if argument specified) and retrieve the canonical name of POD as
found in the C<=head1 NAME> section.
=cut
sub name {
return (@_ > 1 && $_[1]) ?
($_[0]->{-name} = $_[1]) : $_[0]->{-name};
}
##################################
=item C<$checker-E<gt>node()>
Add (if argument specified) and retrieve the nodes (as defined by C<=headX>
and C<=item>) of the current POD. The nodes are returned in the order of
their occurrence. They consist of plain text, each piece of whitespace is
collapsed to a single blank.
=cut
sub node {
my ($self,$text) = @_;
if(defined $text) {
$text =~ s/\s+$//s; # strip trailing whitespace
$text =~ s/\s+/ /gs; # collapse whitespace
# add node, order important!
push(@{$self->{_nodes}}, $text);
# keep also a uniqueness counter
$self->{_unique_nodes}->{$text}++ if($text !~ /^\s*$/s);
return $text;
}
@{$self->{_nodes}};
}
##################################
=item C<$checker-E<gt>idx()>
Add (if argument specified) and retrieve the index entries (as defined by
C<XE<lt>E<gt>>) of the current POD. They consist of plain text, each piece
of whitespace is collapsed to a single blank.
=cut
# set/return index entries of current POD
sub idx {
my ($self,$text) = @_;
if(defined $text) {
$text =~ s/\s+$//s; # strip trailing whitespace
$text =~ s/\s+/ /gs; # collapse whitespace
# add node, order important!
push(@{$self->{_index}}, $text);
# keep also a uniqueness counter
$self->{_unique_nodes}->{$text}++ if($text !~ /^\s*$/s);
return $text;
}
@{$self->{_index}};
}
##################################
=item C<$checker-E<gt>hyperlink()>
Add (if argument specified) and retrieve the hyperlinks (as defined by
C<LE<lt>E<gt>>) of the current POD. They consist of a 2-item array: line
number and C<Pod::Hyperlink> object.
=back
=cut
# set/return hyperlinks of the current POD
sub hyperlink {
my $self = shift;
if($_[0]) {
push(@{$self->{_links}}, $_[0]);
return $_[0];
}
@{$self->{_links}};
}
## overrides for Pod::Parser
sub end_pod {
## Do some final checks and
## print the number of errors found
my $self = shift;
my $infile = $self->input_file();
if(@{$self->{_list_stack}}) {
my $list;
while(($list = $self->_close_list('EOF',$infile)) &&
$list->indent() ne 'auto') {
$self->poderror({ -line => 'EOF', -file => $infile,
-severity => 'ERROR', -msg => '=over on line ' .
$list->start() . ' without closing =back' });
}
}
# check validity of document internal hyperlinks
# first build the node names from the paragraph text
my %nodes;
foreach($self->node()) {
$nodes{$_} = 1;
if(/^(\S+)\s+\S/) {
# we have more than one word. Use the first as a node, too.
# This is used heavily in perlfunc.pod
$nodes{$1} ||= 2; # derived node
}
}
foreach($self->idx()) {
$nodes{$_} = 3; # index node
}
foreach($self->hyperlink()) {
my ($line,$link) = @$_;
# _TODO_ what if there is a link to the page itself by the name,
# e.g. in Tk::Pod : L<Tk::Pod/"DESCRIPTION">
if($link->node() && !$link->page() && $link->type() ne 'hyperlink') {
my $node = $self->_check_ptree($self->parse_text($link->node(),
$line), $line, $infile, 'L');
if($node && !$nodes{$node}) {
$self->poderror({ -line => $line || '', -file => $infile,
-severity => 'ERROR',
-msg => "unresolved internal link '$node'"});
}
}
}
# check the internal nodes for uniqueness. This pertains to
# =headX, =item and X<...>
if($self->{-warnings} && $self->{-warnings}>1) {
foreach(grep($self->{_unique_nodes}->{$_} > 1,
keys %{$self->{_unique_nodes}})) {
$self->poderror({ -line => '-', -file => $infile,
-severity => 'WARNING',
-msg => "multiple occurrence of link target '$_'"});
}
}
# no POD found here
$self->num_errors(-1) if($self->{_commands} == 0);
}
# check a POD command directive
sub command {
my ($self, $cmd, $paragraph, $line_num, $pod_para) = @_;
my ($file, $line) = $pod_para->file_line;
## Check the command syntax
my $arg; # this will hold the command argument
if (! $VALID_COMMANDS{$cmd}) {
$self->poderror({ -line => $line, -file => $file, -severity => 'ERROR',
-msg => "Unknown command '$cmd'" });
}
else { # found a valid command
$self->{_commands}++; # delete this line if below is enabled again
$self->_commands_in_paragraphs($paragraph, $pod_para);
##### following check disabled due to strong request
#if(!$self->{_commands}++ && $cmd !~ /^head/) {
# $self->poderror({ -line => $line, -file => $file,
# -severity => 'WARNING',
# -msg => "file does not start with =head" });
#}
# check syntax of particular command
if($cmd eq 'over') {
# check for argument
$arg = $self->interpolate_and_check($paragraph, $line,$file);
my $indent = 4; # default
if($arg && $arg =~ /^\s*(\d+)\s*$/) {
$indent = $1;
}
# start a new list
$self->_open_list($indent,$line,$file);
}
elsif($cmd eq 'item') {
# are we in a list?
unless(@{$self->{_list_stack}}) {
$self->poderror({ -line => $line, -file => $file,
-severity => 'ERROR',
-msg => '=item without previous =over' });
# auto-open in case we encounter many more
$self->_open_list('auto',$line,$file);
}
my $list = $self->{_list_stack}->[0];
# check whether the previous item had some contents
if(defined $self->{_list_item_contents} &&
$self->{_list_item_contents} == 0) {
$self->poderror({ -line => $line, -file => $file,
-severity => 'WARNING',
-msg => 'previous =item has no contents' });
}
if($list->{_has_par}) {
$self->poderror({ -line => $line, -file => $file,
-severity => 'WARNING',
-msg => 'preceding non-item paragraph(s)' });
delete $list->{_has_par};
}
# check for argument
$arg = $self->interpolate_and_check($paragraph, $line, $file);
if($arg && $arg =~ /(\S+)/) {
$arg =~ s/[\s\n]+$//;
my $type;
if($arg =~ /^[*]\s*(\S*.*)/) {
$type = 'bullet';
$self->{_list_item_contents} = $1 ? 1 : 0;
$arg = $1;
}
elsif($arg =~ /^\d+\.?\s+(\S*)/) {
$type = 'number';
$self->{_list_item_contents} = $1 ? 1 : 0;
$arg = $1;
}
else {
$type = 'definition';
$self->{_list_item_contents} = 1;
}
my $first = $list->type();
if($first && $first ne $type) {
$self->poderror({ -line => $line, -file => $file,
-severity => 'WARNING',
-msg => "=item type mismatch ('$first' vs. '$type')"});
}
else { # first item
$list->type($type);
}
}
else {
$self->poderror({ -line => $line, -file => $file,
-severity => 'WARNING',
-msg => 'No argument for =item' });
$arg = ' '; # empty
$self->{_list_item_contents} = 0;
}
# add this item
$list->item($arg);
# remember this node
$self->node($arg);
}
elsif($cmd eq 'back') {
# check if we have an open list
unless(@{$self->{_list_stack}}) {
$self->poderror({ -line => $line, -file => $file,
-severity => 'ERROR',
-msg => '=back without previous =over' });
}
else {
# check for spurious characters
$arg = $self->interpolate_and_check($paragraph, $line,$file);
if($arg && $arg =~ /\S/) {
$self->poderror({ -line => $line, -file => $file,
-severity => 'ERROR',
-msg => 'Spurious character(s) after =back' });
}
# close list
my $list = $self->_close_list($line,$file);
# check for empty lists
if(!$list->item() && $self->{-warnings}) {
$self->poderror({ -line => $line, -file => $file,
-severity => 'WARNING',
-msg => 'No items in =over (at line ' .
$list->start() . ') / =back list'});
}
}
}
elsif($cmd =~ /^head(\d+)/) {
my $hnum = $1;
$self->{"_have_head_$hnum"}++; # count head types
if($hnum > 1 && !$self->{'_have_head_'.($hnum -1)}) {
$self->poderror({ -line => $line, -file => $file,
-severity => 'WARNING',
-msg => "=head$hnum without preceding higher level"});
}
# check whether the previous =head section had some contents
if(defined $self->{_commands_in_head} &&
$self->{_commands_in_head} == 0 &&
defined $self->{_last_head} &&
$self->{_last_head} >= $hnum) {
$self->poderror({ -line => $line, -file => $file,
-severity => 'WARNING',
-msg => 'empty section in previous paragraph'});
}
$self->{_commands_in_head} = -1;
$self->{_last_head} = $hnum;
# check if there is an open list
if(@{$self->{_list_stack}}) {
my $list;
while(($list = $self->_close_list($line,$file)) &&
$list->indent() ne 'auto') {
$self->poderror({ -line => $line, -file => $file,
-severity => 'ERROR',
-msg => '=over on line '. $list->start() .
" without closing =back (at $cmd)" });
}
}
# remember this node
$arg = $self->interpolate_and_check($paragraph, $line,$file);
$arg =~ s/[\s\n]+$//s;
$self->node($arg);
unless(length($arg)) {
$self->poderror({ -line => $line, -file => $file,
-severity => 'ERROR',
-msg => "empty =$cmd"});
}
if($cmd eq 'head1') {
$self->{_current_head1} = $arg;
} else {
$self->{_current_head1} = '';
}
}
elsif($cmd eq 'begin') {
if($self->{_have_begin}) {
# already have a begin
$self->poderror({ -line => $line, -file => $file,
-severity => 'ERROR',
-msg => q{Nested =begin's (first at line } .
$self->{_have_begin} . ')'});
}
else {
# check for argument
$arg = $self->interpolate_and_check($paragraph, $line,$file);
unless($arg && $arg =~ /(\S+)/) {
$self->poderror({ -line => $line, -file => $file,
-severity => 'ERROR',
-msg => 'No argument for =begin'});
}
# remember the =begin
$self->{_have_begin} = "$line:$1";
}
}
elsif($cmd eq 'end') {
if($self->{_have_begin}) {
# close the existing =begin
$self->{_have_begin} = '';
# check for spurious characters
$arg = $self->interpolate_and_check($paragraph, $line,$file);
# the closing argument is optional
#if($arg && $arg =~ /\S/) {
# $self->poderror({ -line => $line, -file => $file,
# -severity => 'WARNING',
# -msg => "Spurious character(s) after =end" });
#}
}
else {
# don't have a matching =begin
$self->poderror({ -line => $line, -file => $file,
-severity => 'ERROR',
-msg => '=end without =begin' });
}
}
elsif($cmd eq 'for') {
unless($paragraph =~ /\s*(\S+)\s*/) {
$self->poderror({ -line => $line, -file => $file,
-severity => 'ERROR',
-msg => '=for without formatter specification' });
}
$arg = ''; # do not expand paragraph below
}
elsif($cmd =~ /^(pod|cut)$/) {
# check for argument
$arg = $self->interpolate_and_check($paragraph, $line,$file);
if($arg && $arg =~ /(\S+)/) {
$self->poderror({ -line => $line, -file => $file,
-severity => 'ERROR',
-msg => "Spurious text after =$cmd"});
}
if($cmd eq 'cut' && (!$self->{_PREVIOUS} || $self->{_PREVIOUS} eq 'cut')) {
$self->poderror({ -line => $line, -file => $file,
-severity => 'ERROR',
-msg => "Spurious =cut command"});
}
if($cmd eq 'pod' && $self->{_PREVIOUS} && $self->{_PREVIOUS} ne 'cut') {
$self->poderror({ -line => $line, -file => $file,
-severity => 'ERROR',
-msg => "Spurious =pod command"});
}
}
$self->{_commands_in_head}++;
## Check the interior sequences in the command-text
$self->interpolate_and_check($paragraph, $line,$file)
unless(defined $arg);
}
}
sub _open_list
{
my ($self,$indent,$line,$file) = @_;
my $list = Pod::List->new(
-indent => $indent,
-start => $line,
-file => $file);
unshift(@{$self->{_list_stack}}, $list);
undef $self->{_list_item_contents};
$list;
}
sub _close_list
{
my ($self,$line,$file) = @_;
my $list = shift(@{$self->{_list_stack}});
if(defined $self->{_list_item_contents} &&
$self->{_list_item_contents} == 0) {
$self->poderror({ -line => $line, -file => $file,
-severity => 'WARNING',
-msg => 'previous =item has no contents' });
}
undef $self->{_list_item_contents};
$list;
}
# process a block of some text
sub interpolate_and_check {
my ($self, $paragraph, $line, $file) = @_;
## Check the interior sequences in the command-text
# and return the text
$self->_check_ptree(
$self->parse_text($paragraph,$line), $line, $file, '');
}
sub _check_ptree {
my ($self,$ptree,$line,$file,$nestlist) = @_;
local($_);
my $text = '';
# process each node in the parse tree
foreach(@$ptree) {
# regular text chunk
unless(ref) {
# count the unescaped angle brackets
# complain only when warning level is greater than 1
if($self->{-warnings} && $self->{-warnings}>1) {
my $count;
if($count = tr/<>/<>/) {
$self->poderror({ -line => $line, -file => $file,
-severity => 'WARNING',
-msg => "$count unescaped <> in paragraph" });
}
}
$text .= $_;
next;
}
# have an interior sequence
my $cmd = $_->cmd_name();
my $contents = $_->parse_tree();
($file,$line) = $_->file_line();
# check for valid tag
if (! $VALID_SEQUENCES{$cmd}) {
$self->poderror({ -line => $line, -file => $file,
-severity => 'ERROR',
-msg => qq(Unknown interior-sequence '$cmd')});
# expand it anyway
$text .= $self->_check_ptree($contents, $line, $file, "$nestlist$cmd");
next;
}
if(index($nestlist, $cmd) != -1) {
$self->poderror({ -line => $line, -file => $file,
-severity => 'WARNING',
-msg => "nested commands $cmd<...$cmd<...>...>"});
# _TODO_ should we add the contents anyway?
# expand it anyway, see below
}
if($cmd eq 'E') {
# preserve entities
if(@$contents > 1 || ref $$contents[0] || $$contents[0] !~ /^\w+$/) {
$self->poderror({ -line => $line, -file => $file,
-severity => 'ERROR',
-msg => 'garbled entity ' . $_->raw_text()});
next;
}
my $ent = $$contents[0];
my $val;
if($ent =~ /^0x[0-9a-f]+$/i) {
# hexadec entity
$val = hex($ent);
}
elsif($ent =~ /^0\d+$/) {
# octal
$val = oct($ent);
}
elsif($ent =~ /^\d+$/) {
# numeric entity
$val = $ent;
}
if(defined $val) {
if($val>0 && $val<256) {
$text .= chr($val);
}
else {
$self->poderror({ -line => $line, -file => $file,
-severity => 'ERROR',
-msg => 'Entity number out of range ' . $_->raw_text()});
}
}
elsif($ENTITIES{$ent}) {
# known ISO entity
$text .= $ENTITIES{$ent};
}
else {
$self->poderror({ -line => $line, -file => $file,
-severity => 'WARNING',
-msg => 'Unknown entity ' . $_->raw_text()});
$text .= "E<$ent>";
}
}
elsif($cmd eq 'L') {
# try to parse the hyperlink
my $link = Pod::Hyperlink->new($contents->raw_text());
unless(defined $link) {
$self->poderror({ -line => $line, -file => $file,
-severity => 'ERROR',
-msg => 'malformed link ' . $_->raw_text() ." : $@"});
next;
}
$link->line($line); # remember line
if($self->{-warnings}) {
foreach my $w ($link->warning()) {
$self->poderror({ -line => $line, -file => $file,
-severity => 'WARNING',
-msg => $w });
}
}
# check the link text
$text .= $self->_check_ptree($self->parse_text($link->text(),
$line), $line, $file, "$nestlist$cmd");
# remember link
$self->hyperlink([$line,$link]);
}
elsif($cmd =~ /[BCFIS]/) {
# add the guts
$text .= $self->_check_ptree($contents, $line, $file, "$nestlist$cmd");
}
elsif($cmd eq 'Z') {
if(length($contents->raw_text())) {
$self->poderror({ -line => $line, -file => $file,
-severity => 'ERROR',
-msg => 'Nonempty Z<>'});
}
}
elsif($cmd eq 'X') {
my $idx = $self->_check_ptree($contents, $line, $file, "$nestlist$cmd");
if($idx =~ /^\s*$/s) {
$self->poderror({ -line => $line, -file => $file,
-severity => 'ERROR',
-msg => 'Empty X<>'});
}
else {
# remember this node
$self->idx($idx);
}
}
else {
# not reached
croak 'internal error';
}
}
$text;
}
# process a block of verbatim text
sub verbatim {
## Nothing particular to check
my ($self, $paragraph, $line_num, $pod_para) = @_;
$self->_preproc_par($paragraph);
$self->_commands_in_paragraphs($paragraph, $pod_para);
if($self->{_current_head1} eq 'NAME') {
my ($file, $line) = $pod_para->file_line;
$self->poderror({ -line => $line, -file => $file,
-severity => 'WARNING',
-msg => 'Verbatim paragraph in NAME section' });
}
}
# process a block of regular text
sub textblock {
my ($self, $paragraph, $line_num, $pod_para) = @_;
my ($file, $line) = $pod_para->file_line;
$self->_preproc_par($paragraph);
$self->_commands_in_paragraphs($paragraph, $pod_para);
# skip this paragraph if in a =begin block
unless($self->{_have_begin}) {
my $block = $self->interpolate_and_check($paragraph, $line,$file);
if($self->{_current_head1} eq 'NAME') {
if($block =~ /^\s*(\S+?)\s*[,-]/) {
# this is the canonical name
$self->{-name} = $1 unless(defined $self->{-name});
}
}
}
}
sub _preproc_par
{
my $self = shift;
$_[0] =~ s/[\s\n]+$//;
if($_[0]) {
$self->{_commands_in_head}++;
$self->{_list_item_contents}++ if(defined $self->{_list_item_contents});
if(@{$self->{_list_stack}} && !$self->{_list_stack}->[0]->item()) {
$self->{_list_stack}->[0]->{_has_par} = 1;
}
}
}
# look for =foo commands at the start of a line within a paragraph, as for
# instance the following which prints as "* one =item two".
#
# =item one
# =item two
#
# Examples of =foo written in docs are expected to be indented in a verbatim
# or marked up C<=foo> so won't be caught. A double-angle C<< =foo >> could
# have the =foo at the start of a line, but that should be unlikely and is
# easily enough dealt with by not putting a newline after the C<<.
#
sub _commands_in_paragraphs {
my ($self, $str, $pod_para) = @_;
while ($str =~ /[^\n]\n=([a-z][a-z0-9]+)/sg) {
my $cmd = $1;
my $pos = pos($str);
if ($VALID_COMMANDS{$cmd}) {
my ($file, $line) = $pod_para->file_line;
my $part = substr($str, 0, $pos);
$line += ($part =~ tr/\n//); # count of newlines
$self->poderror
({ -line => $line, -file => $file,
-severity => 'ERROR',
-msg => "Apparent command =$cmd not preceded by blank line"});
}
}
}
1;
__END__
=head1 AUTHOR
Please report bugs using L<http://rt.cpan.org>.
Brad Appleton E<lt>bradapp@enteract.comE<gt> (initial version),
Marek Rouchal E<lt>marekr@cpan.orgE<gt>
Based on code for B<Pod::Text::pod2text()> written by
Tom Christiansen E<lt>tchrist@mox.perl.comE<gt>
B<Pod::Checker> is part of the Pod-Checker distribution, and is based on
L<Pod::Parser>.
=cut