CONTENTS

• NAME
• SYNOPSIS
• OPTIONS/ARGUMENTS
  • podchecker()
• DESCRIPTION
• DIAGNOSTICS
  • Errors
  • Warnings
  • Hyperlinks
• RETURN VALUE
• EXAMPLES
• SCRIPTS
• INTERFACE
• AUTHOR

#NAME

Pod::Checker - check pod documents for syntax errors

#SYNOPSIS

use Pod::Checker;$syntax_okay = podchecker($filepath, $outputpath, %options);my $checker = Pod::Checker->new(%options);$checker->parse_from_file($filepath, \*STDERR);

#OPTIONS/ARGUMENTS

$filepath is the input POD to read and$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\*STDIN, and the output-file defaults to\*STDERR.

#podchecker()

This function can take a hash of options:

#-warnings =>val

Turn warnings on/off.val is usually 1 for on, but higher values trigger additional warnings. See"Warnings".

#-quiet =>val

Ifval is true, do not print any errors/warnings.

#DESCRIPTION

podchecker will perform syntax checking of Perl5 POD format documentation.

Curious/ambitious users are welcome to propose additional features they wish to see inPod::Checker andpodchecker and verify that the checks are consistent withperlpod.

The following checks are currently performed:

• Unknown '=xxxx' commands, unknown 'X<...>' interior-sequences, and unterminated interior sequences.

• Check for proper balancing of=begin and=end. The contents of such a block are generally ignored, i.e. no syntax checks are performed.

• Check for proper nesting and balancing of=over,=item and=back.

• Check for same nested interior-sequences (e.g.L<...L<...>...>).

• Check for malformed or non-existing entitiesE<...>.

• Check for correct syntax of hyperlinksL<...>. Seeperlpod for details.

• 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.

#DIAGNOSTICS

#Errors

• empty =headn

  A heading (=head1 or=head2) without any text? That ain't no heading!

• =over on lineN without closing =back

• You forgot a '=back' before '=headN'

• =over is the last thing in the document?!

  The=over command does not have a corresponding=back before the next heading (=head1 or=head2) or the end of the file.

• '=item' outside of any '=over'

• =back without =over

  An=item or=back command has been found outside a=over/=back block.

• Can't have a 0 in =overN

  You need to indent a strictly positive number of spaces, not 0.

• =over should be: '=over' or '=over positive_number'

  Either have an argumentless =over, or have its argument a strictly positive number.

• =beginTARGET without matching =endTARGET

  A=begin command was found that has no matching =end command.

• =begin without a target?

  A=begin command was found that is not followed by the formatter specification.

• =endTARGET without matching =begin.

  A standalone=end command was found.

• '=end' without a target?

  '=end' directives need to have a target, just like =begin directives.

• '=endTARGET' is invalid.

  TARGET needs to be one word

• =endCONTENT doesn't match =beginTARGET

  CONTENT needs to match =begin'sTARGET.

• =for without a target?

  There is no specification of the formatter after the=for command.

• unresolved internal linkNAME

  The given link toNAME does not have a matching node in the current POD. This also happened when a single word node name is not enclosed in"".

• Unknown directive:CMD

  An invalid POD command has been found. Valid are=head1,=head2,=head3,=head4,=over,=item,=back,=begin,=end,=for,=pod,=cut

• Deleting unknown formatting codeSEQ

  An invalid markup command has been encountered. Valid are:B<>,C<>,E<>,F<>,I<>,L<>,S<>,X<>,Z<>

• UnterminatedSEQ<> sequence

  An unclosed formatting code

• An E<...> surrounding strange content

  TheSTRING found cannot be interpreted as a character entity.

• An empty E<>

• An emptyL<>

• An empty X<>

  There needs to be content inside E, L, and X formatting codes.

• Spurious text after =pod / =cut

  The commands=pod and=cut do not take any arguments.

• =back doesn't take any parameters, but you said =backARGUMENT

  The=back command does not take any arguments.

• =pod directives shouldn't be over one line long! Ignoring allN lines of content

  Self explanatory

• =cut found outside a pod block.

  A '=cut' directive found in the middle of non-POD

• Invalid =encoding syntax:CONTENT

  Syntax error in =encoding directive

#Warnings

These may not necessarily cause trouble, but indicate mediocre style.

• nested commandsCMD<...CMD<...>...>

  Two nested identical markup commands have been found. Generally this does not make sense.

• multiple occurrences (N) of link targetname

  The POD file has some=item and/or=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.

• 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.vi users switch on thelist option to avoid this problem.

• =item has no contents

  There is a list=item that has no text contents. You probably want to delete empty items.

• You can't have =items (as at lineN) unless the first thing after the =over is an =item

  A list introduced by=over starts with a text or verbatim paragraph, but continues with=items. Move the non-item paragraph out of the=over/=back block.

• Expected '=itemEXPECTED VALUE'

• Expected '=item *'

• Possible =item type mismatch: 'x' found leading a supposed definition =item

  A list started with e.g. a bullet-like=item and continued with a numbered one. This is obviously inconsistent. For most translators the type of thefirst=item determines the type of the list.

• You have '=item x' instead of the expected '=itemN'

  Erroneous numbering of =item numbers; they need to ascend consecutively.

• Unknown E content in E<CONTENT>

  A character entity was found that does not belong to the standard ISO set or the POD specialsverbar andsol.Currently, this warning only appears if a character entity was found that does not have a Unicode character. This should be fixed to adhere to the original warning.

• empty =over/=back block

  The list opened with=over does not contain anything.

• empty section in previous paragraph

  The previous section (introduced by a=head command) does not contain any valid content. This usually indicates that something is missing. Note: A=head1 followed immediately by=head2 does not trigger this warning.

• Verbatim paragraph in NAME section

  The NAME section (=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.

• =headn without preceding higher level

  For example if there is a=head2 in the POD file prior to a=head1.

• A non-empty Z<>

  TheZ<> sequence is supposed to be empty. Caveat: this issue is detected inPod::Simple and will be flagged as anERROR by any client code; any contents ofZ<...> will be disregarded, anyway.

#Hyperlinks

There are some warnings with respect to malformed hyperlinks:

• ignoring leading/trailing whitespace in link

  There is whitespace at the beginning or the end of the contents of L<...>.

• alternative text/node '%s' contains non-escaped | or /

  The characters| and/ are special in the L<...> 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>

Note that the line number of the error/warning may refer to the line number of the start of the paragraph in which the error/warning exists, not the line number that the error/warning is on. This bug is present in errors/warnings related to formatting codes.This should be fixed.

#RETURN VALUE

podchecker returns the number of POD syntax errors found or -1 if there were no POD commands at all found in the file.

#EXAMPLES

See"SYNOPSIS"

#SCRIPTS

Thepodchecker script that comes with this distribution is a lean wrapper around this module. See the online manual with

podchecker -helppodchecker -man

#INTERFACE

While checking, this module collects document properties, e.g. the nodes for hyperlinks (=headX,=item) and index entries (X<>). 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 v1.24 thePod::Checker module uses only thepoderror method to print errors and warnings. The summary output (e.g. "Pod syntax OK") has been dropped from the module and has been included inpodchecker (the script). This allows users ofPod::Checker to control completely the output behavior. Users ofpodchecker (the script) get the well-known behavior.

v1.45 inherits fromPod::Simple as opposed to all previous versions inheriting from Pod::Parser. Donot use Pod::Simple's interface when using Pod::Checker unless it is documented somewhere on this page. I repeat, DONOT USE POD::SIMPLE'S INTERFACE.

The following list documents the overrides to Pod::Simple, primarily to makePod::Coverage happy:

#end_B

#end_C

#end_Document

#end_F

#end_I

#end_L

#end_Para

#end_S

#end_X

#end_fcode

#end_for

#end_head

#end_head1

#end_head2

#end_head3

#end_head4

#end_item

#end_item_bullet

#end_item_number

#end_item_text

#handle_pod_and_cut

#handle_text

#handle_whiteline

#hyperlink

#scream

#start_B

#start_C

#start_Data

#start_F

#start_I

#start_L

#start_Para

#start_S

#start_Verbatim

#start_X

#start_fcode

#start_for

#start_head

#start_head1

#start_head2

#start_head3

#start_head4

#start_item_bullet

#start_item_number

#start_item_text

#start_over

#start_over_block

#start_over_bullet

#start_over_empty

#start_over_number

#start_over_text

#whine

#Pod::Checker->new( %options )

Return a reference to a new Pod::Checker object that inherits from Pod::Simple and is used for calling the required methods later. The following options are recognized:

-warnings => num Print warnings ifnum is true. The higher the value ofnum, the more warnings are printed. Currently there are only levels 1 and 2.

-quiet => num Ifnum 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.

#$checker->poderror( @args )

#$checker->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@args.

-line

The line number the error occurred in.

-file

The file (name) the error occurred in. Defaults to the name of the current file being processed.

-severity

The error level, should be 'WARNING' or 'ERROR'.

#$checker->num_errors()

Set (if argument specified) and retrieve the number of errors found.

#$checker->num_warnings()

Set (if argument specified) and retrieve the number of warnings found.

#$checker->name()

Set (if argument specified) and retrieve the canonical name of POD as found in the=head1 NAME section.

#$checker->node()

Add (if argument specified) and retrieve the nodes (as defined by=headX and=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.

#$checker->idx()

Add (if argument specified) and retrieve the index entries (as defined byX<>) of the current POD. They consist of plain text, each piece of whitespace is collapsed to a single blank.

#$checker->hyperlinks()

Retrieve an array containing the hyperlinks to things outside the current POD (as defined byL<>).

Each is an instance of a class with the following methods:

#line()

Returns the approximate line number in which the link was encountered

#type()

Returns the type of the link; one of:"url" for things likehttp://www.foo,"man" for man pages, or"pod".

#page()

Returns the linked-to page or url.

#node()

Returns the anchor or node within the linked-to page, or an empty string ("") if none appears in the link.

#AUTHOR

Please report bugs usinghttp://rt.cpan.org.

Brad Appleton <bradapp@enteract.com> (initial version), Marek Rouchal <marekr@cpan.org>, Marc Green <marcgreen@cpan.org> (port to Pod::Simple) Ricardo Signes <rjbs@cpan.org> (more porting to Pod::Simple) Karl Williamson <khw@cpan.org> (more porting to Pod::Simple)

Based on code forPod::Text::pod2text() written by Tom Christiansen <tchrist@mox.perl.com>

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